SDL/src/render/SDL_render.c

/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"

/* The SDL 2D rendering system */

#include "SDL_hints.h"
#include "SDL_render.h"
#include "SDL_sysrender.h"
#include "software/SDL_render_sw_c.h"
#include "../video/SDL_pixels_c.h"

#if defined(__ANDROID__)
#  include "../core/android/SDL_android.h"
#endif

/* as a courtesy to iOS apps, we don't try to draw when in the background, as
that will crash the app. However, these apps _should_ have used
SDL_AddEventWatch to catch SDL_APP_WILLENTERBACKGROUND events and stopped
drawing themselves. Other platforms still draw, as the compositor can use it,
and more importantly: drawing to render targets isn't lost. But I still think
this should probably be removed at some point in the future.  --ryan. */
#if defined(__IPHONEOS__) || defined(__TVOS__) || defined(__ANDROID__)
#define DONT_DRAW_WHILE_HIDDEN 1
#else
#define DONT_DRAW_WHILE_HIDDEN 0
#endif

#define SDL_WINDOWRENDERDATA    "_SDL_WindowRenderData"

#define CHECK_RENDERER_MAGIC(renderer, retval) \
    SDL_assert(renderer && renderer->magic == &renderer_magic); \
    if (!renderer || renderer->magic != &renderer_magic) { \
        SDL_SetError("Invalid renderer"); \
        return retval; \
    }

#define CHECK_TEXTURE_MAGIC(texture, retval) \
    SDL_assert(texture && texture->magic == &texture_magic); \
    if (!texture || texture->magic != &texture_magic) { \
        SDL_SetError("Invalid texture"); \
        return retval; \
    }

/* Predefined blend modes */
#define SDL_COMPOSE_BLENDMODE(srcColorFactor, dstColorFactor, colorOperation, \
                              srcAlphaFactor, dstAlphaFactor, alphaOperation) \
    (SDL_BlendMode)(((Uint32)colorOperation << 0) | \
                    ((Uint32)srcColorFactor << 4) | \
                    ((Uint32)dstColorFactor << 8) | \
                    ((Uint32)alphaOperation << 16) | \
                    ((Uint32)srcAlphaFactor << 20) | \
                    ((Uint32)dstAlphaFactor << 24))

#define SDL_BLENDMODE_NONE_FULL \
    SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ZERO, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ZERO, SDL_BLENDOPERATION_ADD)

#define SDL_BLENDMODE_BLEND_FULL \
    SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD)

#define SDL_BLENDMODE_ADD_FULL \
    SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD)

#define SDL_BLENDMODE_MOD_FULL \
    SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_COLOR, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_ADD)

#define SDL_BLENDMODE_MUL_FULL \
    SDL_COMPOSE_BLENDMODE(SDL_BLENDFACTOR_DST_COLOR, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD, \
                          SDL_BLENDFACTOR_DST_ALPHA, SDL_BLENDFACTOR_ONE_MINUS_SRC_ALPHA, SDL_BLENDOPERATION_ADD)

#if !SDL_RENDER_DISABLED
static const SDL_RenderDriver *render_drivers[] = {
#if SDL_VIDEO_RENDER_D3D
    &D3D_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_D3D11
    &D3D11_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_METAL
    &METAL_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_OGL
    &GL_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_OGL_ES2
    &GLES2_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_OGL_ES
    &GLES_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_DIRECTFB
    &DirectFB_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_PSP
    &PSP_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_VITA_GXM
    &VITA_GXM_RenderDriver,
#endif
#if SDL_VIDEO_RENDER_SW
    &SW_RenderDriver
#endif
};
#endif /* !SDL_RENDER_DISABLED */

static char renderer_magic;
static char texture_magic;

static SDL_INLINE void
DebugLogRenderCommands(const SDL_RenderCommand *cmd)
{
#if 0
    unsigned int i = 1;
    SDL_Log("Render commands to flush:");
    while (cmd) {
        switch (cmd->command) {
            case SDL_RENDERCMD_NO_OP:
                SDL_Log(" %u. no-op", i++);
                break;

            case SDL_RENDERCMD_SETVIEWPORT:
                SDL_Log(" %u. set viewport (first=%u, rect={(%d, %d), %dx%d})", i++,
                        (unsigned int) cmd->data.viewport.first,
                        cmd->data.viewport.rect.x, cmd->data.viewport.rect.y,
                        cmd->data.viewport.rect.w, cmd->data.viewport.rect.h);
                break;

            case SDL_RENDERCMD_SETCLIPRECT:
                SDL_Log(" %u. set cliprect (enabled=%s, rect={(%d, %d), %dx%d})", i++,
                        cmd->data.cliprect.enabled ? "true" : "false",
                        cmd->data.cliprect.rect.x, cmd->data.cliprect.rect.y,
                        cmd->data.cliprect.rect.w, cmd->data.cliprect.rect.h);
                break;

            case SDL_RENDERCMD_SETDRAWCOLOR:
                SDL_Log(" %u. set draw color (first=%u, r=%d, g=%d, b=%d, a=%d)", i++,
                        (unsigned int) cmd->data.color.first,
                        (int) cmd->data.color.r, (int) cmd->data.color.g,
                        (int) cmd->data.color.b, (int) cmd->data.color.a);
                break;

            case SDL_RENDERCMD_CLEAR:
                SDL_Log(" %u. clear (first=%u, r=%d, g=%d, b=%d, a=%d)", i++,
                        (unsigned int) cmd->data.color.first,
                        (int) cmd->data.color.r, (int) cmd->data.color.g,
                        (int) cmd->data.color.b, (int) cmd->data.color.a);
                break;

            case SDL_RENDERCMD_DRAW_POINTS:
                SDL_Log(" %u. draw points (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d)", i++,
                        (unsigned int) cmd->data.draw.first,
                        (unsigned int) cmd->data.draw.count,
                        (int) cmd->data.draw.r, (int) cmd->data.draw.g,
                        (int) cmd->data.draw.b, (int) cmd->data.draw.a,
                        (int) cmd->data.draw.blend);
                break;

            case SDL_RENDERCMD_DRAW_LINES:
                SDL_Log(" %u. draw lines (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d)", i++,
                        (unsigned int) cmd->data.draw.first,
                        (unsigned int) cmd->data.draw.count,
                        (int) cmd->data.draw.r, (int) cmd->data.draw.g,
                        (int) cmd->data.draw.b, (int) cmd->data.draw.a,
                        (int) cmd->data.draw.blend);
                break;

            case SDL_RENDERCMD_FILL_RECTS:
                SDL_Log(" %u. fill rects (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d)", i++,
                        (unsigned int) cmd->data.draw.first,
                        (unsigned int) cmd->data.draw.count,
                        (int) cmd->data.draw.r, (int) cmd->data.draw.g,
                        (int) cmd->data.draw.b, (int) cmd->data.draw.a,
                        (int) cmd->data.draw.blend);
                break;

            case SDL_RENDERCMD_COPY:
                SDL_Log(" %u. copy (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d, tex=%p)", i++,
                        (unsigned int) cmd->data.draw.first,
                        (unsigned int) cmd->data.draw.count,
                        (int) cmd->data.draw.r, (int) cmd->data.draw.g,
                        (int) cmd->data.draw.b, (int) cmd->data.draw.a,
                        (int) cmd->data.draw.blend, cmd->data.draw.texture);
                break;


            case SDL_RENDERCMD_COPY_EX:
                SDL_Log(" %u. copyex (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d, tex=%p)", i++,
                        (unsigned int) cmd->data.draw.first,
                        (unsigned int) cmd->data.draw.count,
                        (int) cmd->data.draw.r, (int) cmd->data.draw.g,
                        (int) cmd->data.draw.b, (int) cmd->data.draw.a,
                        (int) cmd->data.draw.blend, cmd->data.draw.texture);
                break;

            case SDL_RENDERCMD_GEOMETRY:
                SDL_Log(" %u. geometry (first=%u, count=%u, r=%d, g=%d, b=%d, a=%d, blend=%d, tex=%p)", i++,
                        (unsigned int) cmd->data.draw.first,
                        (unsigned int) cmd->data.draw.count,
                        (int) cmd->data.draw.r, (int) cmd->data.draw.g,
                        (int) cmd->data.draw.b, (int) cmd->data.draw.a,
                        (int) cmd->data.draw.blend, cmd->data.draw.texture);
                break;

        }
        cmd = cmd->next;
    }
#endif
}

static int
FlushRenderCommands(SDL_Renderer *renderer)
{
    int retval;

    SDL_assert((renderer->render_commands == NULL) == (renderer->render_commands_tail == NULL));

    if (renderer->render_commands == NULL) {  /* nothing to do! */
        SDL_assert(renderer->vertex_data_used == 0);
        return 0;
    }

    DebugLogRenderCommands(renderer->render_commands);

    retval = renderer->RunCommandQueue(renderer, renderer->render_commands, renderer->vertex_data, renderer->vertex_data_used);

    /* Move the whole render command queue to the unused pool so we can reuse them next time. */
    if (renderer->render_commands_tail != NULL) {
        renderer->render_commands_tail->next = renderer->render_commands_pool;
        renderer->render_commands_pool = renderer->render_commands;
        renderer->render_commands_tail = NULL;
        renderer->render_commands = NULL;
    }
    renderer->vertex_data_used = 0;
    renderer->render_command_generation++;
    renderer->color_queued = SDL_FALSE;
    renderer->viewport_queued = SDL_FALSE;
    renderer->cliprect_queued = SDL_FALSE;
    return retval;
}

static int
FlushRenderCommandsIfTextureNeeded(SDL_Texture *texture)
{
    SDL_Renderer *renderer = texture->renderer;
    if (texture->last_command_generation == renderer->render_command_generation) {
        /* the current command queue depends on this texture, flush the queue now before it changes */
        return FlushRenderCommands(renderer);
    }
    return 0;
}

static SDL_INLINE int
FlushRenderCommandsIfNotBatching(SDL_Renderer *renderer)
{
    return renderer->batching ? 0 : FlushRenderCommands(renderer);
}

int
SDL_RenderFlush(SDL_Renderer * renderer)
{
    return FlushRenderCommands(renderer);
}

void *
SDL_AllocateRenderVertices(SDL_Renderer *renderer, const size_t numbytes, const size_t alignment, size_t *offset)
{
    const size_t needed = renderer->vertex_data_used + numbytes + alignment;
    const size_t current_offset = renderer->vertex_data_used;

    const size_t aligner = (alignment && ((current_offset & (alignment - 1)) != 0)) ? (alignment - (current_offset & (alignment - 1))) : 0;
    const size_t aligned = current_offset + aligner;

    if (renderer->vertex_data_allocation < needed) {
        const size_t current_allocation = renderer->vertex_data ? renderer->vertex_data_allocation : 1024;
        size_t newsize = current_allocation * 2;
        void *ptr;
        while (newsize < needed) {
            newsize *= 2;
        }

        ptr = SDL_realloc(renderer->vertex_data, newsize);

        if (ptr == NULL) {
            SDL_OutOfMemory();
            return NULL;
        }
        renderer->vertex_data = ptr;
        renderer->vertex_data_allocation = newsize;
    }

    if (offset) {
        *offset = aligned;
    }

    renderer->vertex_data_used += aligner + numbytes;

    return ((Uint8 *) renderer->vertex_data) + aligned;
}

static SDL_RenderCommand *
AllocateRenderCommand(SDL_Renderer *renderer)
{
    SDL_RenderCommand *retval = NULL;

    /* !!! FIXME: are there threading limitations in SDL's render API? If not, we need to mutex this. */
    retval = renderer->render_commands_pool;
    if (retval != NULL) {
        renderer->render_commands_pool = retval->next;
        retval->next = NULL;
    } else {
        retval = SDL_calloc(1, sizeof (*retval));
        if (!retval) {
            SDL_OutOfMemory();
            return NULL;
        }
    }

    SDL_assert((renderer->render_commands == NULL) == (renderer->render_commands_tail == NULL));
    if (renderer->render_commands_tail != NULL) {
        renderer->render_commands_tail->next = retval;
    } else {
        renderer->render_commands = retval;
    }
    renderer->render_commands_tail = retval;

    return retval;
}

static int
QueueCmdSetViewport(SDL_Renderer *renderer)
{
    int retval = 0;
    if (!renderer->viewport_queued || (SDL_memcmp(&renderer->viewport, &renderer->last_queued_viewport, sizeof (SDL_Rect)) != 0)) {
        SDL_RenderCommand *cmd = AllocateRenderCommand(renderer);
        retval = -1;
        if (cmd != NULL) {
            cmd->command = SDL_RENDERCMD_SETVIEWPORT;
            cmd->data.viewport.first = 0;  /* render backend will fill this in. */
            SDL_memcpy(&cmd->data.viewport.rect, &renderer->viewport, sizeof (renderer->viewport));
            retval = renderer->QueueSetViewport(renderer, cmd);
            if (retval < 0) {
                cmd->command = SDL_RENDERCMD_NO_OP;
            } else {
                SDL_memcpy(&renderer->last_queued_viewport, &renderer->viewport, sizeof (SDL_Rect));
                renderer->viewport_queued = SDL_TRUE;
            }
        }
    }
    return retval;
}

static int
QueueCmdSetClipRect(SDL_Renderer *renderer)
{
    int retval = 0;
    if ((!renderer->cliprect_queued) ||
         (renderer->clipping_enabled != renderer->last_queued_cliprect_enabled) ||
         (SDL_memcmp(&renderer->clip_rect, &renderer->last_queued_cliprect, sizeof (SDL_Rect)) != 0)) {
        SDL_RenderCommand *cmd = AllocateRenderCommand(renderer);
        if (cmd == NULL) {
            retval = -1;
        } else {
            cmd->command = SDL_RENDERCMD_SETCLIPRECT;
            cmd->data.cliprect.enabled = renderer->clipping_enabled;
            SDL_memcpy(&cmd->data.cliprect.rect, &renderer->clip_rect, sizeof (cmd->data.cliprect.rect));
            SDL_memcpy(&renderer->last_queued_cliprect, &renderer->clip_rect, sizeof (SDL_Rect));
            renderer->last_queued_cliprect_enabled = renderer->clipping_enabled;
            renderer->cliprect_queued = SDL_TRUE;
        }
    }
    return retval;
}

static int
QueueCmdSetDrawColor(SDL_Renderer *renderer, SDL_Color *col)
{
    const Uint32 color = ((col->a << 24) | (col->r << 16) | (col->g << 8) | col->b);
    int retval = 0;

    if (!renderer->color_queued || (color != renderer->last_queued_color)) {
        SDL_RenderCommand *cmd = AllocateRenderCommand(renderer);
        retval = -1;

        if (cmd != NULL) {
            cmd->command = SDL_RENDERCMD_SETDRAWCOLOR;
            cmd->data.color.first = 0;  /* render backend will fill this in. */
            cmd->data.color.r = col->r;
            cmd->data.color.g = col->g;
            cmd->data.color.b = col->b;
            cmd->data.color.a = col->a;
            retval = renderer->QueueSetDrawColor(renderer, cmd);
            if (retval < 0) {
                cmd->command = SDL_RENDERCMD_NO_OP;
            } else {
                renderer->last_queued_color = color;
                renderer->color_queued = SDL_TRUE;
            }
        }
    }
    return retval;
}

static int
QueueCmdClear(SDL_Renderer *renderer)
{
    SDL_RenderCommand *cmd = AllocateRenderCommand(renderer);
    if (cmd == NULL) {
        return -1;
    }

    cmd->command = SDL_RENDERCMD_CLEAR;
    cmd->data.color.first = 0;
    cmd->data.color.r = renderer->color.r;
    cmd->data.color.g = renderer->color.g;
    cmd->data.color.b = renderer->color.b;
    cmd->data.color.a = renderer->color.a;
    return 0;
}

static SDL_RenderCommand *
PrepQueueCmdDraw(SDL_Renderer *renderer, const SDL_RenderCommandType cmdtype, SDL_Texture *texture)
{
    SDL_RenderCommand *cmd = NULL;
    int retval = 0;
    SDL_Color *color;
    SDL_BlendMode blendMode;

    if (texture) {
        color = &texture->color;
        blendMode = texture->blendMode;
    } else {
        color = &renderer->color;
        blendMode = renderer->blendMode;
    }

    if (cmdtype != SDL_RENDERCMD_GEOMETRY) {
        /* !!! FIXME: drop this draw if viewport w or h is zero. */
        retval = QueueCmdSetDrawColor(renderer, color);
    }

    /* Set the viewport and clip rect directly before draws, so the backends
     * don't have to worry about that state not being valid at draw time. */
    if (retval == 0 && !renderer->viewport_queued) {
        retval = QueueCmdSetViewport(renderer);
    }
    if (retval == 0 && !renderer->cliprect_queued) {
        retval = QueueCmdSetClipRect(renderer);
    }

    if (retval == 0) {
        cmd = AllocateRenderCommand(renderer);
        if (cmd != NULL) {
            cmd->command = cmdtype;
            cmd->data.draw.first = 0;  /* render backend will fill this in. */
            cmd->data.draw.count = 0;  /* render backend will fill this in. */
            cmd->data.draw.r = color->r;
            cmd->data.draw.g = color->g;
            cmd->data.draw.b = color->b;
            cmd->data.draw.a = color->a;
            cmd->data.draw.blend = blendMode;
            cmd->data.draw.texture = texture;
        }
    }
    return cmd;
}

static int
QueueCmdDrawPoints(SDL_Renderer *renderer, const SDL_FPoint * points, const int count)
{
    SDL_RenderCommand *cmd = PrepQueueCmdDraw(renderer, SDL_RENDERCMD_DRAW_POINTS, NULL);
    int retval = -1;
    if (cmd != NULL) {
        retval = renderer->QueueDrawPoints(renderer, cmd, points, count);
        if (retval < 0) {
            cmd->command = SDL_RENDERCMD_NO_OP;
        }
    }
    return retval;
}

static int
QueueCmdDrawLines(SDL_Renderer *renderer, const SDL_FPoint * points, const int count)
{
    SDL_RenderCommand *cmd = PrepQueueCmdDraw(renderer, SDL_RENDERCMD_DRAW_LINES, NULL);
    int retval = -1;
    if (cmd != NULL) {
        retval = renderer->QueueDrawLines(renderer, cmd, points, count);
        if (retval < 0) {
            cmd->command = SDL_RENDERCMD_NO_OP;
        }
    }
    return retval;
}

static int
QueueCmdFillRects(SDL_Renderer *renderer, const SDL_FRect * rects, const int count)
{
    SDL_RenderCommand *cmd;
    int retval = -1;
    int use_geometry = renderer->QueueGeometry && ! (renderer->info.flags & SDL_RENDERER_SOFTWARE);

    cmd = PrepQueueCmdDraw(renderer, (use_geometry ? SDL_RENDERCMD_GEOMETRY : SDL_RENDERCMD_FILL_RECTS), NULL);

    if (cmd != NULL) {
        if (use_geometry) {
            SDL_bool isstack1;
            SDL_bool isstack2;
            float *xy = SDL_small_alloc(float, 4 * 2 * count, &isstack1);
            int *indices = SDL_small_alloc(int, 6 * count, &isstack2);

            if (xy && indices) {
                int i;
                float *ptr_xy = xy;
                int *ptr_indices = indices;
                const int xy_stride = 2 * sizeof (float);
                const int num_vertices = 4 * count;
                const int num_indices = 6 * count;
                const int size_indices = 4;
                int cur_indice = 0;

                for (i = 0; i < count; ++i) {
                    float minx, miny, maxx, maxy;

                    minx = rects[i].x;
                    miny = rects[i].y;
                    maxx = rects[i].x + rects[i].w;
                    maxy = rects[i].y + rects[i].h;

                    *ptr_xy++ = minx;
                    *ptr_xy++ = miny;
                    *ptr_xy++ = maxx;
                    *ptr_xy++ = miny;
                    *ptr_xy++ = maxx;
                    *ptr_xy++ = maxy;
                    *ptr_xy++ = minx;
                    *ptr_xy++ = maxy;

                    *ptr_indices++ = cur_indice + 0;
                    *ptr_indices++ = cur_indice + 1;
                    *ptr_indices++ = cur_indice + 2;
                    *ptr_indices++ = cur_indice + 0;
                    *ptr_indices++ = cur_indice + 2;
                    *ptr_indices++ = cur_indice + 3;
                    cur_indice += 4;
                }

                retval = renderer->QueueGeometry(renderer, cmd, NULL,
                        xy, xy_stride, (int *) &renderer->color, 0 /* color_stride */, NULL, 0,
                        num_vertices, indices, num_indices, size_indices,
                        1.0f, 1.0f);

                if (retval < 0) {
                    cmd->command = SDL_RENDERCMD_NO_OP;
                }

                SDL_small_free(xy, isstack1);
                SDL_small_free(indices, isstack2);
            }
        } else {
            retval = renderer->QueueFillRects(renderer, cmd, rects, count);
            if (retval < 0) {
                cmd->command = SDL_RENDERCMD_NO_OP;
            }
        }
    }
    return retval;
}

static int
QueueCmdCopy(SDL_Renderer *renderer, SDL_Texture * texture, const SDL_Rect * srcrect, const SDL_FRect * dstrect)
{
    SDL_RenderCommand *cmd = PrepQueueCmdDraw(renderer, SDL_RENDERCMD_COPY, texture);
    int retval = -1;
    if (cmd != NULL) {
        retval = renderer->QueueCopy(renderer, cmd, texture, srcrect, dstrect);
        if (retval < 0) {
            cmd->command = SDL_RENDERCMD_NO_OP;
        }
    }
    return retval;
}

static int
QueueCmdCopyEx(SDL_Renderer *renderer, SDL_Texture * texture,
               const SDL_Rect * srcquad, const SDL_FRect * dstrect,
               const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
{
    SDL_RenderCommand *cmd = PrepQueueCmdDraw(renderer, SDL_RENDERCMD_COPY_EX, texture);
    int retval = -1;
    SDL_assert(renderer->QueueCopyEx != NULL);  /* should have caught at higher level. */
    if (cmd != NULL) {
        retval = renderer->QueueCopyEx(renderer, cmd, texture, srcquad, dstrect, angle, center, flip);
        if (retval < 0) {
            cmd->command = SDL_RENDERCMD_NO_OP;
        }
    }
    return retval;
}

static int
QueueCmdGeometry(SDL_Renderer *renderer, SDL_Texture *texture,
        const float *xy, int xy_stride,
        const int *color, int color_stride,
        const float *uv, int uv_stride,
        int num_vertices,
        const void *indices, int num_indices, int size_indices,
        float scale_x, float scale_y)
{
    SDL_RenderCommand *cmd;
    int retval = -1;
    cmd = PrepQueueCmdDraw(renderer, SDL_RENDERCMD_GEOMETRY, texture);
    if (cmd != NULL) {
        retval = renderer->QueueGeometry(renderer, cmd, texture,
                xy, xy_stride, color, color_stride, uv, uv_stride,
                num_vertices, indices, num_indices, size_indices,
                scale_x, scale_y);
        if (retval < 0) {
            cmd->command = SDL_RENDERCMD_NO_OP;
        }
    }
    return retval;
}

static int UpdateLogicalSize(SDL_Renderer *renderer);

int
SDL_GetNumRenderDrivers(void)
{
#if !SDL_RENDER_DISABLED
    return SDL_arraysize(render_drivers);
#else
    return 0;
#endif
}

int
SDL_GetRenderDriverInfo(int index, SDL_RendererInfo * info)
{
#if !SDL_RENDER_DISABLED
    if (index < 0 || index >= SDL_GetNumRenderDrivers()) {
        return SDL_SetError("index must be in the range of 0 - %d",
                            SDL_GetNumRenderDrivers() - 1);
    }
    *info = render_drivers[index]->info;
    return 0;
#else
    return SDL_SetError("SDL not built with rendering support");
#endif
}

static void GetWindowViewportValues(SDL_Renderer *renderer, int *logical_w, int *logical_h, SDL_Rect *viewport, SDL_FPoint *scale)
{
    SDL_LockMutex(renderer->target_mutex);
    *logical_w = renderer->target ? renderer->logical_w_backup : renderer->logical_w;
    *logical_h = renderer->target ? renderer->logical_h_backup : renderer->logical_h;
    *viewport = renderer->target ? renderer->viewport_backup : renderer->viewport;
    *scale = renderer->target ? renderer->scale_backup : renderer->scale;
    SDL_UnlockMutex(renderer->target_mutex);
}

static int SDLCALL
SDL_RendererEventWatch(void *userdata, SDL_Event *event)
{
    SDL_Renderer *renderer = (SDL_Renderer *)userdata;

    if (event->type == SDL_WINDOWEVENT) {
        SDL_Window *window = SDL_GetWindowFromID(event->window.windowID);
        if (window == renderer->window) {
            if (renderer->WindowEvent) {
                renderer->WindowEvent(renderer, &event->window);
            }

            if (event->window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
                /* Make sure we're operating on the default render target */
                SDL_Texture *saved_target = SDL_GetRenderTarget(renderer);
                if (saved_target) {
                    SDL_SetRenderTarget(renderer, NULL);
                }

                /* Update the DPI scale if the window has been resized. */
                if (window && renderer->GetOutputSize) {
                    int window_w, window_h;
                    int output_w, output_h;
                    if (renderer->GetOutputSize(renderer, &output_w, &output_h) == 0) {
                        SDL_GetWindowSize(renderer->window, &window_w, &window_h);
                        renderer->dpi_scale.x = (float)window_w / output_w;
                        renderer->dpi_scale.y = (float)window_h / output_h;
                    }
                }

                if (renderer->logical_w) {
                    UpdateLogicalSize(renderer);
                } else {
                    /* Window was resized, reset viewport */
                    int w, h;

                    if (renderer->GetOutputSize) {
                        renderer->GetOutputSize(renderer, &w, &h);
                    } else {
                        SDL_GetWindowSize(renderer->window, &w, &h);
                    }

                    if (renderer->target) {
                        renderer->viewport_backup.x = 0;
                        renderer->viewport_backup.y = 0;
                        renderer->viewport_backup.w = w;
                        renderer->viewport_backup.h = h;
                    } else {
                        renderer->viewport.x = 0;
                        renderer->viewport.y = 0;
                        renderer->viewport.w = w;
                        renderer->viewport.h = h;
                        QueueCmdSetViewport(renderer);
                        FlushRenderCommandsIfNotBatching(renderer);
                    }
                }

                if (saved_target) {
                    SDL_SetRenderTarget(renderer, saved_target);
                }
            } else if (event->window.event == SDL_WINDOWEVENT_HIDDEN) {
                renderer->hidden = SDL_TRUE;
            } else if (event->window.event == SDL_WINDOWEVENT_SHOWN) {
                if (!(SDL_GetWindowFlags(window) & SDL_WINDOW_MINIMIZED)) {
                    renderer->hidden = SDL_FALSE;
                }
            } else if (event->window.event == SDL_WINDOWEVENT_MINIMIZED) {
                renderer->hidden = SDL_TRUE;
            } else if (event->window.event == SDL_WINDOWEVENT_RESTORED ||
                       event->window.event == SDL_WINDOWEVENT_MAXIMIZED) {
                if (!(SDL_GetWindowFlags(window) & SDL_WINDOW_HIDDEN)) {
                    renderer->hidden = SDL_FALSE;
                }
            }
        }
    } else if (event->type == SDL_MOUSEMOTION) {
        SDL_Window *window = SDL_GetWindowFromID(event->motion.windowID);
        if (window == renderer->window) {
            int logical_w, logical_h;
            SDL_Rect viewport;
            SDL_FPoint scale;
            GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
            if (logical_w) {
                event->motion.x -= (int)(viewport.x * renderer->dpi_scale.x);
                event->motion.y -= (int)(viewport.y * renderer->dpi_scale.y);
                event->motion.x = (int)(event->motion.x / (scale.x * renderer->dpi_scale.x));
                event->motion.y = (int)(event->motion.y / (scale.y * renderer->dpi_scale.y));
                if (event->motion.xrel != 0 && renderer->relative_scaling) {
                    float rel = renderer->xrel + event->motion.xrel / (scale.x * renderer->dpi_scale.x);
                    float trunc = SDL_truncf(rel);
                    renderer->xrel = rel - trunc;
                    event->motion.xrel = (Sint32) trunc;
                }
                if (event->motion.yrel != 0 && renderer->relative_scaling) {
                    float rel = renderer->yrel + event->motion.yrel / (scale.y * renderer->dpi_scale.y);
                    float trunc = SDL_truncf(rel);
                    renderer->yrel = rel - trunc;
                    event->motion.yrel = (Sint32) trunc;
                }
            }
        }
    } else if (event->type == SDL_MOUSEBUTTONDOWN ||
               event->type == SDL_MOUSEBUTTONUP) {
        SDL_Window *window = SDL_GetWindowFromID(event->button.windowID);
        if (window == renderer->window) {
            int logical_w, logical_h;
            SDL_Rect viewport;
            SDL_FPoint scale;
            GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);
            if (logical_w) {
                event->button.x -= (int)(viewport.x * renderer->dpi_scale.x);
                event->button.y -= (int)(viewport.y * renderer->dpi_scale.y);
                event->button.x = (int)(event->button.x / (scale.x * renderer->dpi_scale.x));
                event->button.y = (int)(event->button.y / (scale.y * renderer->dpi_scale.y));
            }
        }
    } else if (event->type == SDL_FINGERDOWN ||
               event->type == SDL_FINGERUP ||
               event->type == SDL_FINGERMOTION) {
        int logical_w, logical_h;
        float physical_w, physical_h;
        SDL_Rect viewport;
        SDL_FPoint scale;
        GetWindowViewportValues(renderer, &logical_w, &logical_h, &viewport, &scale);

        /* !!! FIXME: we probably should drop events that are outside of the
           !!! FIXME: viewport, but we can't do that from an event watcher,
           !!! FIXME: and we would have to track if a touch happened outside
           !!! FIXME: the viewport and then slid into it to insert extra
           !!! FIXME: events, which is a mess, so for now we just clamp these
           !!! FIXME: events to the edge. */

        if (renderer->GetOutputSize) {
            int w, h;
            renderer->GetOutputSize(renderer, &w, &h);
            physical_w = (float) w;
            physical_h = (float) h;
        } else {
            int w, h;
            SDL_GetWindowSize(renderer->window, &w, &h);
            physical_w = ((float) w) * renderer->dpi_scale.x;
            physical_h = ((float) h) * renderer->dpi_scale.y;
        }

        if (physical_w == 0.0f) {  /* nowhere for the touch to go, avoid division by zero and put it dead center. */
            event->tfinger.x = 0.5f;
        } else {
            const float normalized_viewport_x = ((float) viewport.x) / physical_w;
            const float normalized_viewport_w = ((float) viewport.w) / physical_w;
            if (event->tfinger.x <= normalized_viewport_x) {
                event->tfinger.x = 0.0f;  /* to the left of the viewport, clamp to the edge. */
            } else if (event->tfinger.x >= (normalized_viewport_x + normalized_viewport_w)) {
                event->tfinger.x = 1.0f;  /* to the right of the viewport, clamp to the edge. */
            } else {
                event->tfinger.x = (event->tfinger.x - normalized_viewport_x) / normalized_viewport_w;
            }
        }

        if (physical_h == 0.0f) {  /* nowhere for the touch to go, avoid division by zero and put it dead center. */
            event->tfinger.y = 0.5f;
        } else {
            const float normalized_viewport_y = ((float) viewport.y) / physical_h;
            const float normalized_viewport_h = ((float) viewport.h) / physical_h;
            if (event->tfinger.y <= normalized_viewport_y) {
                event->tfinger.y = 0.0f;  /* to the left of the viewport, clamp to the edge. */
            } else if (event->tfinger.y >= (normalized_viewport_y + normalized_viewport_h)) {
                event->tfinger.y = 1.0f;  /* to the right of the viewport, clamp to the edge. */
            } else {
                event->tfinger.y = (event->tfinger.y - normalized_viewport_y) / normalized_viewport_h;
            }
        }
    }

    return 0;
}

int
SDL_CreateWindowAndRenderer(int width, int height, Uint32 window_flags,
                            SDL_Window **window, SDL_Renderer **renderer)
{
    *window = SDL_CreateWindow(NULL, SDL_WINDOWPOS_UNDEFINED,
                                     SDL_WINDOWPOS_UNDEFINED,
                                     width, height, window_flags);
    if (!*window) {
        *renderer = NULL;
        return -1;
    }

    *renderer = SDL_CreateRenderer(*window, -1, 0);
    if (!*renderer) {
        return -1;
    }

    return 0;
}

static SDL_INLINE
void VerifyDrawQueueFunctions(const SDL_Renderer *renderer)
{
    /* all of these functions are required to be implemented, even as no-ops, so we don't
        have to check that they aren't NULL over and over. */
    SDL_assert(renderer->QueueSetViewport != NULL);
    SDL_assert(renderer->QueueSetDrawColor != NULL);
    SDL_assert(renderer->QueueDrawPoints != NULL);
    SDL_assert(renderer->QueueDrawLines != NULL);
    SDL_assert(renderer->QueueFillRects != NULL || renderer->QueueGeometry != NULL);
    SDL_assert(renderer->QueueCopy != NULL || renderer->QueueGeometry != NULL);
    SDL_assert(renderer->RunCommandQueue != NULL);
}

SDL_Renderer *
SDL_CreateRenderer(SDL_Window * window, int index, Uint32 flags)
{
#if !SDL_RENDER_DISABLED
    SDL_Renderer *renderer = NULL;
    int n = SDL_GetNumRenderDrivers();
    SDL_bool batching = SDL_TRUE;
    const char *hint;

#if defined(__ANDROID__)
    Android_ActivityMutex_Lock_Running();
#endif

    if (!window) {
        SDL_SetError("Invalid window");
        goto error;
    }

    if (SDL_GetRenderer(window)) {
        SDL_SetError("Renderer already associated with window");
        goto error;
    }

    hint = SDL_GetHint(SDL_HINT_RENDER_VSYNC);
    if (hint && *hint) {
        if (SDL_GetHintBoolean(SDL_HINT_RENDER_VSYNC, SDL_TRUE)) {
            flags |= SDL_RENDERER_PRESENTVSYNC;
        } else {
            flags &= ~SDL_RENDERER_PRESENTVSYNC;
        }
    }

    if (index < 0) {
        hint = SDL_GetHint(SDL_HINT_RENDER_DRIVER);
        if (hint) {
            for (index = 0; index < n; ++index) {
                const SDL_RenderDriver *driver = render_drivers[index];

                if (SDL_strcasecmp(hint, driver->info.name) == 0) {
                    /* Create a new renderer instance */
                    renderer = driver->CreateRenderer(window, flags);
                    if (renderer) {
                        batching = SDL_FALSE;
                    }
                    break;
                }
            }
        }

        if (!renderer) {
            for (index = 0; index < n; ++index) {
                const SDL_RenderDriver *driver = render_drivers[index];

                if ((driver->info.flags & flags) == flags) {
                    /* Create a new renderer instance */
                    renderer = driver->CreateRenderer(window, flags);
                    if (renderer) {
                        /* Yay, we got one! */
                        break;
                    }
                }
            }
        }
        if (index == n) {
            SDL_SetError("Couldn't find matching render driver");
            goto error;
        }
    } else {
        if (index >= SDL_GetNumRenderDrivers()) {
            SDL_SetError("index must be -1 or in the range of 0 - %d",
                         SDL_GetNumRenderDrivers() - 1);
            goto error;
        }
        /* Create a new renderer instance */
        renderer = render_drivers[index]->CreateRenderer(window, flags);
        batching = SDL_FALSE;
    }

    if (!renderer) {
        goto error;
    }

    VerifyDrawQueueFunctions(renderer);

    /* let app/user override batching decisions. */
    if (renderer->always_batch) {
        batching = SDL_TRUE;
    } else if (SDL_GetHint(SDL_HINT_RENDER_BATCHING)) {
        batching = SDL_GetHintBoolean(SDL_HINT_RENDER_BATCHING, SDL_TRUE);
    }

    renderer->batching = batching;
    renderer->magic = &renderer_magic;
    renderer->window = window;
    renderer->target_mutex = SDL_CreateMutex();
    renderer->scale.x = 1.0f;
    renderer->scale.y = 1.0f;
    renderer->dpi_scale.x = 1.0f;
    renderer->dpi_scale.y = 1.0f;

    /* new textures start at zero, so we start at 1 so first render doesn't flush by accident. */
    renderer->render_command_generation = 1;

    if (window && renderer->GetOutputSize) {
        int window_w, window_h;
        int output_w, output_h;
        if (renderer->GetOutputSize(renderer, &output_w, &output_h) == 0) {
            SDL_GetWindowSize(renderer->window, &window_w, &window_h);
            renderer->dpi_scale.x = (float)window_w / output_w;
            renderer->dpi_scale.y = (float)window_h / output_h;
        }
    }

    renderer->relative_scaling = SDL_GetHintBoolean(SDL_HINT_MOUSE_RELATIVE_SCALING, SDL_TRUE);

    if (SDL_GetWindowFlags(window) & (SDL_WINDOW_HIDDEN|SDL_WINDOW_MINIMIZED)) {
        renderer->hidden = SDL_TRUE;
    } else {
        renderer->hidden = SDL_FALSE;
    }

    SDL_SetWindowData(window, SDL_WINDOWRENDERDATA, renderer);

    SDL_RenderSetViewport(renderer, NULL);

    SDL_AddEventWatch(SDL_RendererEventWatch, renderer);

    SDL_LogInfo(SDL_LOG_CATEGORY_RENDER,
                "Created renderer: %s", renderer->info.name);

#if defined(__ANDROID__)
    Android_ActivityMutex_Unlock();
#endif
    return renderer;

error:

#if defined(__ANDROID__)
    Android_ActivityMutex_Unlock();
#endif
    return NULL;

#else
    SDL_SetError("SDL not built with rendering support");
    return NULL;
#endif
}

SDL_Renderer *
SDL_CreateSoftwareRenderer(SDL_Surface * surface)
{
#if !SDL_RENDER_DISABLED && SDL_VIDEO_RENDER_SW
    SDL_Renderer *renderer;

    renderer = SW_CreateRendererForSurface(surface);

    if (renderer) {
        VerifyDrawQueueFunctions(renderer);
        renderer->magic = &renderer_magic;
        renderer->target_mutex = SDL_CreateMutex();
        renderer->scale.x = 1.0f;
        renderer->scale.y = 1.0f;

        /* new textures start at zero, so we start at 1 so first render doesn't flush by accident. */
        renderer->render_command_generation = 1;

        SDL_RenderSetViewport(renderer, NULL);
    }
    return renderer;
#else
    SDL_SetError("SDL not built with rendering support");
    return NULL;
#endif /* !SDL_RENDER_DISABLED */
}

SDL_Renderer *
SDL_GetRenderer(SDL_Window * window)
{
    return (SDL_Renderer *)SDL_GetWindowData(window, SDL_WINDOWRENDERDATA);
}

int
SDL_GetRendererInfo(SDL_Renderer * renderer, SDL_RendererInfo * info)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    *info = renderer->info;
    return 0;
}

int
SDL_GetRendererOutputSize(SDL_Renderer * renderer, int *w, int *h)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (renderer->target) {
        return SDL_QueryTexture(renderer->target, NULL, NULL, w, h);
    } else if (renderer->GetOutputSize) {
        return renderer->GetOutputSize(renderer, w, h);
    } else if (renderer->window) {
        SDL_GetWindowSize(renderer->window, w, h);
        return 0;
    } else {
        SDL_assert(0 && "This should never happen");
        return SDL_SetError("Renderer doesn't support querying output size");
    }
}

static SDL_bool
IsSupportedBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
{
    switch (blendMode)
    {
    /* These are required to be supported by all renderers */
    case SDL_BLENDMODE_NONE:
    case SDL_BLENDMODE_BLEND:
    case SDL_BLENDMODE_ADD:
    case SDL_BLENDMODE_MOD:
    case SDL_BLENDMODE_MUL:
        return SDL_TRUE;

    default:
        return renderer->SupportsBlendMode && renderer->SupportsBlendMode(renderer, blendMode);
    }
}

static SDL_bool
IsSupportedFormat(SDL_Renderer * renderer, Uint32 format)
{
    Uint32 i;

    for (i = 0; i < renderer->info.num_texture_formats; ++i) {
        if (renderer->info.texture_formats[i] == format) {
            return SDL_TRUE;
        }
    }
    return SDL_FALSE;
}

static Uint32
GetClosestSupportedFormat(SDL_Renderer * renderer, Uint32 format)
{
    Uint32 i;

    if (SDL_ISPIXELFORMAT_FOURCC(format)) {
        /* Look for an exact match */
        for (i = 0; i < renderer->info.num_texture_formats; ++i) {
            if (renderer->info.texture_formats[i] == format) {
                return renderer->info.texture_formats[i];
            }
        }
    } else {
        SDL_bool hasAlpha = SDL_ISPIXELFORMAT_ALPHA(format);

        /* We just want to match the first format that has the same channels */
        for (i = 0; i < renderer->info.num_texture_formats; ++i) {
            if (!SDL_ISPIXELFORMAT_FOURCC(renderer->info.texture_formats[i]) &&
                SDL_ISPIXELFORMAT_ALPHA(renderer->info.texture_formats[i]) == hasAlpha) {
                return renderer->info.texture_formats[i];
            }
        }
    }
    return renderer->info.texture_formats[0];
}


static SDL_ScaleMode SDL_GetScaleMode(void)
{
    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);

    if (!hint || SDL_strcasecmp(hint, "nearest") == 0) {
        return SDL_ScaleModeNearest;
    } else if (SDL_strcasecmp(hint, "linear") == 0) {
        return SDL_ScaleModeLinear;
    } else if (SDL_strcasecmp(hint, "best") == 0) {
        return SDL_ScaleModeBest;
    } else {
        return (SDL_ScaleMode)SDL_atoi(hint);
    }
}

SDL_Texture *
SDL_CreateTexture(SDL_Renderer * renderer, Uint32 format, int access, int w, int h)
{
    SDL_Texture *texture;
    SDL_bool texture_is_fourcc_and_target;

    CHECK_RENDERER_MAGIC(renderer, NULL);

    if (!format) {
        format = renderer->info.texture_formats[0];
    }
    if (SDL_BYTESPERPIXEL(format) == 0) {
        SDL_SetError("Invalid texture format");
        return NULL;
    }
    if (SDL_ISPIXELFORMAT_INDEXED(format)) {
        if (!IsSupportedFormat(renderer, format)) {
            SDL_SetError("Palettized textures are not supported");
            return NULL;
        }
    }
    if (w <= 0 || h <= 0) {
        SDL_SetError("Texture dimensions can't be 0");
        return NULL;
    }
    if ((renderer->info.max_texture_width && w > renderer->info.max_texture_width) ||
        (renderer->info.max_texture_height && h > renderer->info.max_texture_height)) {
        SDL_SetError("Texture dimensions are limited to %dx%d", renderer->info.max_texture_width, renderer->info.max_texture_height);
        return NULL;
    }
    texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
    if (!texture) {
        SDL_OutOfMemory();
        return NULL;
    }
    texture->magic = &texture_magic;
    texture->format = format;
    texture->access = access;
    texture->w = w;
    texture->h = h;
    texture->color.r = 255;
    texture->color.g = 255;
    texture->color.b = 255;
    texture->color.a = 255;
    texture->scaleMode = SDL_GetScaleMode();
    texture->renderer = renderer;
    texture->next = renderer->textures;
    if (renderer->textures) {
        renderer->textures->prev = texture;
    }
    renderer->textures = texture;

    /* FOURCC format cannot be used directly by renderer back-ends for target texture */
    texture_is_fourcc_and_target = (access == SDL_TEXTUREACCESS_TARGET && SDL_ISPIXELFORMAT_FOURCC(texture->format));

    if (texture_is_fourcc_and_target == SDL_FALSE && IsSupportedFormat(renderer, format)) {
        if (renderer->CreateTexture(renderer, texture) < 0) {
            SDL_DestroyTexture(texture);
            return NULL;
        }
    } else {
        int closest_format;

        if (texture_is_fourcc_and_target == SDL_FALSE) {
            closest_format = GetClosestSupportedFormat(renderer, format);
        } else {
            closest_format = renderer->info.texture_formats[0];
        }

        texture->native = SDL_CreateTexture(renderer, closest_format, access, w, h);
        if (!texture->native) {
            SDL_DestroyTexture(texture);
            return NULL;
        }

        /* Swap textures to have texture before texture->native in the list */
        texture->native->next = texture->next;
        if (texture->native->next) {
            texture->native->next->prev = texture->native;
        }
        texture->prev = texture->native->prev;
        if (texture->prev) {
            texture->prev->next = texture;
        }
        texture->native->prev = texture;
        texture->next = texture->native;
        renderer->textures = texture;

        if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
#if SDL_HAVE_YUV
            texture->yuv = SDL_SW_CreateYUVTexture(format, w, h);
#else
            SDL_SetError("SDL not built with YUV support");
#endif
            if (!texture->yuv) {
                SDL_DestroyTexture(texture);
                return NULL;
            }
        } else if (access == SDL_TEXTUREACCESS_STREAMING) {
            /* The pitch is 4 byte aligned */
            texture->pitch = (((w * SDL_BYTESPERPIXEL(format)) + 3) & ~3);
            texture->pixels = SDL_calloc(1, texture->pitch * h);
            if (!texture->pixels) {
                SDL_DestroyTexture(texture);
                return NULL;
            }
        }
    }
    return texture;
}

SDL_Texture *
SDL_CreateTextureFromSurface(SDL_Renderer * renderer, SDL_Surface * surface)
{
    const SDL_PixelFormat *fmt;
    SDL_bool needAlpha;
    SDL_bool direct_update;
    int i;
    Uint32 format = SDL_PIXELFORMAT_UNKNOWN;
    SDL_Texture *texture;

    CHECK_RENDERER_MAGIC(renderer, NULL);

    if (!surface) {
        SDL_SetError("SDL_CreateTextureFromSurface() passed NULL surface");
        return NULL;
    }

    /* See what the best texture format is */
    fmt = surface->format;
    if (fmt->Amask || SDL_HasColorKey(surface)) {
        needAlpha = SDL_TRUE;
    } else {
        needAlpha = SDL_FALSE;
    }

    /* If Palette contains alpha values, promotes to alpha format */
    if (fmt->palette) {
        SDL_bool is_opaque, has_alpha_channel;
        SDL_DetectPalette(fmt->palette, &is_opaque, &has_alpha_channel);
        if (!is_opaque) {
            needAlpha = SDL_TRUE;
        }
    }

    /* Try to have the best pixel format for the texture */
    /* No alpha, but a colorkey => promote to alpha */
    if (!fmt->Amask && SDL_HasColorKey(surface)) {
        if (fmt->format == SDL_PIXELFORMAT_RGB888) {
            for (i = 0; i < (int)renderer->info.num_texture_formats; ++i) {
                if (renderer->info.texture_formats[i] == SDL_PIXELFORMAT_ARGB8888) {
                    format = SDL_PIXELFORMAT_ARGB8888;
                    break;
                }
            }
        } else if (fmt->format == SDL_PIXELFORMAT_BGR888) {
            for (i = 0; i < (int)renderer->info.num_texture_formats; ++i) {
                if (renderer->info.texture_formats[i] == SDL_PIXELFORMAT_ABGR8888) {
                    format = SDL_PIXELFORMAT_ABGR8888;
                    break;
                }
            }
        }
    } else {
        /* Exact match would be fine */
        for (i = 0; i < (int)renderer->info.num_texture_formats; ++i) {
            if (renderer->info.texture_formats[i] == fmt->format) {
                format = fmt->format;
                break;
            }
        }
    }

    /* Fallback, choose a valid pixel format */
    if (format == SDL_PIXELFORMAT_UNKNOWN) {
        format = renderer->info.texture_formats[0];
        for (i = 0; i < (int)renderer->info.num_texture_formats; ++i) {
            if (!SDL_ISPIXELFORMAT_FOURCC(renderer->info.texture_formats[i]) &&
                    SDL_ISPIXELFORMAT_ALPHA(renderer->info.texture_formats[i]) == needAlpha) {
                format = renderer->info.texture_formats[i];
                break;
            }
        }
    }

    texture = SDL_CreateTexture(renderer, format, SDL_TEXTUREACCESS_STATIC,
                                surface->w, surface->h);
    if (!texture) {
        return NULL;
    }

    if (format == surface->format->format) {
        if (surface->format->Amask && SDL_HasColorKey(surface)) {
            /* Surface and Renderer formats are identicals. 
             * Intermediate conversion is needed to convert color key to alpha (SDL_ConvertColorkeyToAlpha()). */
            direct_update = SDL_FALSE;
        } else {
            /* Update Texture directly */
            direct_update = SDL_TRUE;
        }
    } else {
        /* Surface and Renderer formats are differents, it needs an intermediate conversion. */
        direct_update = SDL_FALSE;
    }

    if (direct_update) {
        if (SDL_MUSTLOCK(surface)) {
            SDL_LockSurface(surface);
            SDL_UpdateTexture(texture, NULL, surface->pixels, surface->pitch);
            SDL_UnlockSurface(surface);
        } else {
            SDL_UpdateTexture(texture, NULL, surface->pixels, surface->pitch);
        }

#if SDL_VIDEO_RENDER_DIRECTFB
        /* DirectFB allows palette format for textures.
         * Copy SDL_Surface palette to the texture */
        if (SDL_ISPIXELFORMAT_INDEXED(format)) {
            if (SDL_strcasecmp(renderer->info.name, "directfb") == 0) {
                extern void DirectFB_SetTexturePalette(SDL_Renderer *renderer, SDL_Texture *texture, SDL_Palette *pal);
                DirectFB_SetTexturePalette(renderer, texture, surface->format->palette);
            }
        }
#endif

    } else {
        SDL_PixelFormat *dst_fmt;
        SDL_Surface *temp = NULL;

        /* Set up a destination surface for the texture update */
        dst_fmt = SDL_AllocFormat(format);
        if (!dst_fmt) {
           SDL_DestroyTexture(texture);
           return NULL;
        }
        temp = SDL_ConvertSurface(surface, dst_fmt, 0);
        SDL_FreeFormat(dst_fmt);
        if (temp) {
            SDL_UpdateTexture(texture, NULL, temp->pixels, temp->pitch);
            SDL_FreeSurface(temp);
        } else {
            SDL_DestroyTexture(texture);
            return NULL;
        }
    }

    {
        Uint8 r, g, b, a;
        SDL_BlendMode blendMode;

        SDL_GetSurfaceColorMod(surface, &r, &g, &b);
        SDL_SetTextureColorMod(texture, r, g, b);

        SDL_GetSurfaceAlphaMod(surface, &a);
        SDL_SetTextureAlphaMod(texture, a);

        if (SDL_HasColorKey(surface)) {
            /* We converted to a texture with alpha format */
            SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
        } else {
            SDL_GetSurfaceBlendMode(surface, &blendMode);
            SDL_SetTextureBlendMode(texture, blendMode);
        }
    }
    return texture;
}

int
SDL_QueryTexture(SDL_Texture * texture, Uint32 * format, int *access,
                 int *w, int *h)
{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (format) {
        *format = texture->format;
    }
    if (access) {
        *access = texture->access;
    }
    if (w) {
        *w = texture->w;
    }
    if (h) {
        *h = texture->h;
    }
    return 0;
}

int
SDL_SetTextureColorMod(SDL_Texture * texture, Uint8 r, Uint8 g, Uint8 b)
{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (r < 255 || g < 255 || b < 255) {
        texture->modMode |= SDL_TEXTUREMODULATE_COLOR;
    } else {
        texture->modMode &= ~SDL_TEXTUREMODULATE_COLOR;
    }
    texture->color.r = r;
    texture->color.g = g;
    texture->color.b = b;
    if (texture->native) {
        return SDL_SetTextureColorMod(texture->native, r, g, b);
    }
    return 0;
}

int
SDL_GetTextureColorMod(SDL_Texture * texture, Uint8 * r, Uint8 * g,
                       Uint8 * b)
{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (r) {
        *r = texture->color.r;
    }
    if (g) {
        *g = texture->color.g;
    }
    if (b) {
        *b = texture->color.b;
    }
    return 0;
}

int
SDL_SetTextureAlphaMod(SDL_Texture * texture, Uint8 alpha)
{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (alpha < 255) {
        texture->modMode |= SDL_TEXTUREMODULATE_ALPHA;
    } else {
        texture->modMode &= ~SDL_TEXTUREMODULATE_ALPHA;
    }
    texture->color.a = alpha;
    if (texture->native) {
        return SDL_SetTextureAlphaMod(texture->native, alpha);
    }
    return 0;
}

int
SDL_GetTextureAlphaMod(SDL_Texture * texture, Uint8 * alpha)
{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (alpha) {
        *alpha = texture->color.a;
    }
    return 0;
}

int
SDL_SetTextureBlendMode(SDL_Texture * texture, SDL_BlendMode blendMode)
{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, -1);

    renderer = texture->renderer;
    if (!IsSupportedBlendMode(renderer, blendMode)) {
        return SDL_Unsupported();
    }
    texture->blendMode = blendMode;
    if (texture->native) {
        return SDL_SetTextureBlendMode(texture->native, blendMode);
    }
    return 0;
}

int
SDL_GetTextureBlendMode(SDL_Texture * texture, SDL_BlendMode *blendMode)
{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (blendMode) {
        *blendMode = texture->blendMode;
    }
    return 0;
}

int
SDL_SetTextureScaleMode(SDL_Texture * texture, SDL_ScaleMode scaleMode)
{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, -1);

    renderer = texture->renderer;
    renderer->SetTextureScaleMode(renderer, texture, scaleMode);
    texture->scaleMode = scaleMode;
    if (texture->native) {
        return SDL_SetTextureScaleMode(texture->native, scaleMode);
    }
    return 0;
}

int
SDL_GetTextureScaleMode(SDL_Texture * texture, SDL_ScaleMode *scaleMode)
{
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (scaleMode) {
        *scaleMode = texture->scaleMode;
    }
    return 0;
}

int
SDL_SetTextureUserData(SDL_Texture * texture, void *userdata)
{
    CHECK_TEXTURE_MAGIC(texture, -1);

    texture->userdata = userdata;
    return 0;
}

void *
SDL_GetTextureUserData(SDL_Texture * texture)
{
    CHECK_TEXTURE_MAGIC(texture, NULL);

    return texture->userdata;
}

#if SDL_HAVE_YUV
static int
SDL_UpdateTextureYUV(SDL_Texture * texture, const SDL_Rect * rect,
                     const void *pixels, int pitch)
{
    SDL_Texture *native = texture->native;
    SDL_Rect full_rect;

    if (SDL_SW_UpdateYUVTexture(texture->yuv, rect, pixels, pitch) < 0) {
        return -1;
    }

    full_rect.x = 0;
    full_rect.y = 0;
    full_rect.w = texture->w;
    full_rect.h = texture->h;
    rect = &full_rect;

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        /* We can lock the texture and copy to it */
        void *native_pixels = NULL;
        int native_pitch = 0;

        if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
            return -1;
        }
        SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                            rect->w, rect->h, native_pixels, native_pitch);
        SDL_UnlockTexture(native);
    } else {
        /* Use a temporary buffer for updating */
        const int temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        const size_t alloclen = rect->h * temp_pitch;
        if (alloclen > 0) {
            void *temp_pixels = SDL_malloc(alloclen);
            if (!temp_pixels) {
                return SDL_OutOfMemory();
            }
            SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                                rect->w, rect->h, temp_pixels, temp_pitch);
            SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
            SDL_free(temp_pixels);
        }
    }
    return 0;
}
#endif /* SDL_HAVE_YUV */

static int
SDL_UpdateTextureNative(SDL_Texture * texture, const SDL_Rect * rect,
                        const void *pixels, int pitch)
{
    SDL_Texture *native = texture->native;

    if (!rect->w || !rect->h) {
        return 0;  /* nothing to do. */
    }

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        /* We can lock the texture and copy to it */
        void *native_pixels = NULL;
        int native_pitch = 0;

        if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
            return -1;
        }
        SDL_ConvertPixels(rect->w, rect->h,
                          texture->format, pixels, pitch,
                          native->format, native_pixels, native_pitch);
        SDL_UnlockTexture(native);
    } else {
        /* Use a temporary buffer for updating */
        const int temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        const size_t alloclen = rect->h * temp_pitch;
        if (alloclen > 0) {
            void *temp_pixels = SDL_malloc(alloclen);
            if (!temp_pixels) {
                return SDL_OutOfMemory();
            }
            SDL_ConvertPixels(rect->w, rect->h,
                              texture->format, pixels, pitch,
                              native->format, temp_pixels, temp_pitch);
            SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
            SDL_free(temp_pixels);
        }
    }
    return 0;
}

int
SDL_UpdateTexture(SDL_Texture * texture, const SDL_Rect * rect,
                  const void *pixels, int pitch)
{
    SDL_Rect real_rect;

    CHECK_TEXTURE_MAGIC(texture, -1);

    if (!pixels) {
        return SDL_InvalidParamError("pixels");
    }
    if (!pitch) {
        return SDL_InvalidParamError("pitch");
    }

    real_rect.x = 0;
    real_rect.y = 0;
    real_rect.w = texture->w;
    real_rect.h = texture->h;
    if (rect) {
        if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
            return 0;
        }
    }

    if (real_rect.w == 0 || real_rect.h == 0) {
        return 0;  /* nothing to do. */
#if SDL_HAVE_YUV
    } else if (texture->yuv) {
        return SDL_UpdateTextureYUV(texture, &real_rect, pixels, pitch);
#endif
    } else if (texture->native) {
        return SDL_UpdateTextureNative(texture, &real_rect, pixels, pitch);
    } else {
        SDL_Renderer *renderer = texture->renderer;
        if (FlushRenderCommandsIfTextureNeeded(texture) < 0) {
            return -1;
        }
        return renderer->UpdateTexture(renderer, texture, &real_rect, pixels, pitch);
    }
}

#if SDL_HAVE_YUV
static int
SDL_UpdateTextureYUVPlanar(SDL_Texture * texture, const SDL_Rect * rect,
                           const Uint8 *Yplane, int Ypitch,
                           const Uint8 *Uplane, int Upitch,
                           const Uint8 *Vplane, int Vpitch)
{
    SDL_Texture *native = texture->native;
    SDL_Rect full_rect;

    if (SDL_SW_UpdateYUVTexturePlanar(texture->yuv, rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch) < 0) {
        return -1;
    }

    full_rect.x = 0;
    full_rect.y = 0;
    full_rect.w = texture->w;
    full_rect.h = texture->h;
    rect = &full_rect;

    if (!rect->w || !rect->h) {
        return 0;  /* nothing to do. */
    }

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        /* We can lock the texture and copy to it */
        void *native_pixels = NULL;
        int native_pitch = 0;

        if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
            return -1;
        }
        SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                            rect->w, rect->h, native_pixels, native_pitch);
        SDL_UnlockTexture(native);
    } else {
        /* Use a temporary buffer for updating */
        const int temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        const size_t alloclen = rect->h * temp_pitch;
        if (alloclen > 0) {
            void *temp_pixels = SDL_malloc(alloclen);
            if (!temp_pixels) {
                return SDL_OutOfMemory();
            }
            SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                                rect->w, rect->h, temp_pixels, temp_pitch);
            SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
            SDL_free(temp_pixels);
        }
    }
    return 0;
}

static int
SDL_UpdateTextureNVPlanar(SDL_Texture * texture, const SDL_Rect * rect,
                           const Uint8 *Yplane, int Ypitch,
                           const Uint8 *UVplane, int UVpitch)
{
    SDL_Texture *native = texture->native;
    SDL_Rect full_rect;

    if (SDL_SW_UpdateNVTexturePlanar(texture->yuv, rect, Yplane, Ypitch, UVplane, UVpitch) < 0) {
        return -1;
    }

    full_rect.x = 0;
    full_rect.y = 0;
    full_rect.w = texture->w;
    full_rect.h = texture->h;
    rect = &full_rect;

    if (!rect->w || !rect->h) {
        return 0;  /* nothing to do. */
    }

    if (texture->access == SDL_TEXTUREACCESS_STREAMING) {
        /* We can lock the texture and copy to it */
        void *native_pixels = NULL;
        int native_pitch = 0;

        if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
            return -1;
        }
        SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                            rect->w, rect->h, native_pixels, native_pitch);
        SDL_UnlockTexture(native);
    } else {
        /* Use a temporary buffer for updating */
        const int temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
        const size_t alloclen = rect->h * temp_pitch;
        if (alloclen > 0) {
            void *temp_pixels = SDL_malloc(alloclen);
            if (!temp_pixels) {
                return SDL_OutOfMemory();
            }
            SDL_SW_CopyYUVToRGB(texture->yuv, rect, native->format,
                                rect->w, rect->h, temp_pixels, temp_pitch);
            SDL_UpdateTexture(native, rect, temp_pixels, temp_pitch);
            SDL_free(temp_pixels);
        }
    }
    return 0;
}


#endif /* SDL_HAVE_YUV */

int SDL_UpdateYUVTexture(SDL_Texture * texture, const SDL_Rect * rect,
                         const Uint8 *Yplane, int Ypitch,
                         const Uint8 *Uplane, int Upitch,
                         const Uint8 *Vplane, int Vpitch)
{
#if SDL_HAVE_YUV
    SDL_Renderer *renderer;
    SDL_Rect real_rect;

    CHECK_TEXTURE_MAGIC(texture, -1);

    if (!Yplane) {
        return SDL_InvalidParamError("Yplane");
    }
    if (!Ypitch) {
        return SDL_InvalidParamError("Ypitch");
    }
    if (!Uplane) {
        return SDL_InvalidParamError("Uplane");
    }
    if (!Upitch) {
        return SDL_InvalidParamError("Upitch");
    }
    if (!Vplane) {
        return SDL_InvalidParamError("Vplane");
    }
    if (!Vpitch) {
        return SDL_InvalidParamError("Vpitch");
    }

    if (texture->format != SDL_PIXELFORMAT_YV12 &&
        texture->format != SDL_PIXELFORMAT_IYUV) {
        return SDL_SetError("Texture format must by YV12 or IYUV");
    }

    real_rect.x = 0;
    real_rect.y = 0;
    real_rect.w = texture->w;
    real_rect.h = texture->h;
    if (rect) {
        SDL_IntersectRect(rect, &real_rect, &real_rect);
    }

    if (real_rect.w == 0 || real_rect.h == 0) {
        return 0;  /* nothing to do. */
    }

    if (texture->yuv) {
        return SDL_UpdateTextureYUVPlanar(texture, &real_rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch);
    } else {
        SDL_assert(!texture->native);
        renderer = texture->renderer;
        SDL_assert(renderer->UpdateTextureYUV);
        if (renderer->UpdateTextureYUV) {
            if (FlushRenderCommandsIfTextureNeeded(texture) < 0) {
                return -1;
            }
            return renderer->UpdateTextureYUV(renderer, texture, &real_rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch);
        } else {
            return SDL_Unsupported();
        }
    }
#else
    return -1;
#endif
}

int SDL_UpdateNVTexture(SDL_Texture * texture, const SDL_Rect * rect,
                         const Uint8 *Yplane, int Ypitch,
                         const Uint8 *UVplane, int UVpitch)
{
#if SDL_HAVE_YUV
    SDL_Renderer *renderer;
    SDL_Rect real_rect;

    CHECK_TEXTURE_MAGIC(texture, -1);

    if (!Yplane) {
        return SDL_InvalidParamError("Yplane");
    }
    if (!Ypitch) {
        return SDL_InvalidParamError("Ypitch");
    }
    if (!UVplane) {
        return SDL_InvalidParamError("UVplane");
    }
    if (!UVpitch) {
        return SDL_InvalidParamError("UVpitch");
    }

    if (texture->format != SDL_PIXELFORMAT_NV12 &&
        texture->format != SDL_PIXELFORMAT_NV21) {
        return SDL_SetError("Texture format must by NV12 or NV21");
    }

    real_rect.x = 0;
    real_rect.y = 0;
    real_rect.w = texture->w;
    real_rect.h = texture->h;
    if (rect) {
        SDL_IntersectRect(rect, &real_rect, &real_rect);
    }

    if (real_rect.w == 0 || real_rect.h == 0) {
        return 0;  /* nothing to do. */
    }

    if (texture->yuv) {
        return SDL_UpdateTextureNVPlanar(texture, &real_rect, Yplane, Ypitch, UVplane, UVpitch);
    } else {
        SDL_assert(!texture->native);
        renderer = texture->renderer;
        SDL_assert(renderer->UpdateTextureNV);
        if (renderer->UpdateTextureNV) {
            if (FlushRenderCommandsIfTextureNeeded(texture) < 0) {
                return -1;
            }
            return renderer->UpdateTextureNV(renderer, texture, &real_rect, Yplane, Ypitch, UVplane, UVpitch);
        } else {
            return SDL_Unsupported();
        }
    }
#else
    return -1;
#endif
}



#if SDL_HAVE_YUV
static int
SDL_LockTextureYUV(SDL_Texture * texture, const SDL_Rect * rect,
                   void **pixels, int *pitch)
{
    return SDL_SW_LockYUVTexture(texture->yuv, rect, pixels, pitch);
}
#endif /* SDL_HAVE_YUV */

static int
SDL_LockTextureNative(SDL_Texture * texture, const SDL_Rect * rect,
                      void **pixels, int *pitch)
{
    texture->locked_rect = *rect;
    *pixels = (void *) ((Uint8 *) texture->pixels +
                        rect->y * texture->pitch +
                        rect->x * SDL_BYTESPERPIXEL(texture->format));
    *pitch = texture->pitch;
    return 0;
}

int
SDL_LockTexture(SDL_Texture * texture, const SDL_Rect * rect,
                void **pixels, int *pitch)
{
    SDL_Rect full_rect;

    CHECK_TEXTURE_MAGIC(texture, -1);

    if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
        return SDL_SetError("SDL_LockTexture(): texture must be streaming");
    }

    if (!rect) {
        full_rect.x = 0;
        full_rect.y = 0;
        full_rect.w = texture->w;
        full_rect.h = texture->h;
        rect = &full_rect;
    }

#if SDL_HAVE_YUV
    if (texture->yuv) {
        if (FlushRenderCommandsIfTextureNeeded(texture) < 0) {
            return -1;
        }
        return SDL_LockTextureYUV(texture, rect, pixels, pitch);
    } else
#endif
    if (texture->native) {
        /* Calls a real SDL_LockTexture/SDL_UnlockTexture on unlock, flushing then. */
        return SDL_LockTextureNative(texture, rect, pixels, pitch);
    } else {
        SDL_Renderer *renderer = texture->renderer;
        if (FlushRenderCommandsIfTextureNeeded(texture) < 0) {
            return -1;
        }
        return renderer->LockTexture(renderer, texture, rect, pixels, pitch);
    }
}

int
SDL_LockTextureToSurface(SDL_Texture *texture, const SDL_Rect *rect,
                         SDL_Surface **surface)
{
    SDL_Rect real_rect;
    void *pixels = NULL;
    int pitch = 0; /* fix static analysis */
    int ret;

    if (texture == NULL || surface == NULL) {
        return -1;
    }

    real_rect.x = 0;
    real_rect.y = 0;
    real_rect.w = texture->w;
    real_rect.h = texture->h;
    if (rect) {
        SDL_IntersectRect(rect, &real_rect, &real_rect);
    }

    ret = SDL_LockTexture(texture, &real_rect, &pixels, &pitch);
    if (ret < 0) {
        return ret;
    }

    texture->locked_surface = SDL_CreateRGBSurfaceWithFormatFrom(pixels, real_rect.w, real_rect.h, 0, pitch, texture->format);
    if (texture->locked_surface == NULL) {
        SDL_UnlockTexture(texture);
        return -1;
    }

    *surface = texture->locked_surface;
    return 0;
}

#if SDL_HAVE_YUV
static void
SDL_UnlockTextureYUV(SDL_Texture * texture)
{
    SDL_Texture *native = texture->native;
    void *native_pixels = NULL;
    int native_pitch = 0;
    SDL_Rect rect;

    rect.x = 0;
    rect.y = 0;
    rect.w = texture->w;
    rect.h = texture->h;

    if (SDL_LockTexture(native, &rect, &native_pixels, &native_pitch) < 0) {
        return;
    }
    SDL_SW_CopyYUVToRGB(texture->yuv, &rect, native->format,
                        rect.w, rect.h, native_pixels, native_pitch);
    SDL_UnlockTexture(native);
}
#endif /* SDL_HAVE_YUV */

static void
SDL_UnlockTextureNative(SDL_Texture * texture)
{
    SDL_Texture *native = texture->native;
    void *native_pixels = NULL;
    int native_pitch = 0;
    const SDL_Rect *rect = &texture->locked_rect;
    const void* pixels = (void *) ((Uint8 *) texture->pixels +
                        rect->y * texture->pitch +
                        rect->x * SDL_BYTESPERPIXEL(texture->format));
    int pitch = texture->pitch;

    if (SDL_LockTexture(native, rect, &native_pixels, &native_pitch) < 0) {
        return;
    }
    SDL_ConvertPixels(rect->w, rect->h,
                      texture->format, pixels, pitch,
                      native->format, native_pixels, native_pitch);
    SDL_UnlockTexture(native);
}

void
SDL_UnlockTexture(SDL_Texture * texture)
{
    CHECK_TEXTURE_MAGIC(texture, );

    if (texture->access != SDL_TEXTUREACCESS_STREAMING) {
        return;
    }
#if SDL_HAVE_YUV
    if (texture->yuv) {
        SDL_UnlockTextureYUV(texture);
    } else
#endif
    if (texture->native) {
        SDL_UnlockTextureNative(texture);
    } else {
        SDL_Renderer *renderer = texture->renderer;
        renderer->UnlockTexture(renderer, texture);
    }

    SDL_FreeSurface(texture->locked_surface);
    texture->locked_surface = NULL;
}

SDL_bool
SDL_RenderTargetSupported(SDL_Renderer *renderer)
{
    if (!renderer || !renderer->SetRenderTarget) {
        return SDL_FALSE;
    }
    return (renderer->info.flags & SDL_RENDERER_TARGETTEXTURE) != 0;
}

int
SDL_SetRenderTarget(SDL_Renderer *renderer, SDL_Texture *texture)
{
    if (!SDL_RenderTargetSupported(renderer)) {
        return SDL_Unsupported();
    }

    /* texture == NULL is valid and means reset the target to the window */
    if (texture) {
        CHECK_TEXTURE_MAGIC(texture, -1);
        if (renderer != texture->renderer) {
            return SDL_SetError("Texture was not created with this renderer");
        }
        if (texture->access != SDL_TEXTUREACCESS_TARGET) {
            return SDL_SetError("Texture not created with SDL_TEXTUREACCESS_TARGET");
        }
        if (texture->native) {
            /* Always render to the native texture */
            texture = texture->native;
        }
    }

    if (texture == renderer->target) {
        /* Nothing to do! */
        return 0;
    }

    FlushRenderCommands(renderer);  /* time to send everything to the GPU! */

    SDL_LockMutex(renderer->target_mutex);

    if (texture && !renderer->target) {
        /* Make a backup of the viewport */
        renderer->viewport_backup = renderer->viewport;
        renderer->clip_rect_backup = renderer->clip_rect;
        renderer->clipping_enabled_backup = renderer->clipping_enabled;
        renderer->scale_backup = renderer->scale;
        renderer->logical_w_backup = renderer->logical_w;
        renderer->logical_h_backup = renderer->logical_h;
    }
    renderer->target = texture;

    if (renderer->SetRenderTarget(renderer, texture) < 0) {
        SDL_UnlockMutex(renderer->target_mutex);
        return -1;
    }

    if (texture) {
        renderer->viewport.x = 0;
        renderer->viewport.y = 0;
        renderer->viewport.w = texture->w;
        renderer->viewport.h = texture->h;
        SDL_zero(renderer->clip_rect);
        renderer->clipping_enabled = SDL_FALSE;
        renderer->scale.x = 1.0f;
        renderer->scale.y = 1.0f;
        renderer->logical_w = texture->w;
        renderer->logical_h = texture->h;
    } else {
        renderer->viewport = renderer->viewport_backup;
        renderer->clip_rect = renderer->clip_rect_backup;
        renderer->clipping_enabled = renderer->clipping_enabled_backup;
        renderer->scale = renderer->scale_backup;
        renderer->logical_w = renderer->logical_w_backup;
        renderer->logical_h = renderer->logical_h_backup;
    }

    SDL_UnlockMutex(renderer->target_mutex);

    if (QueueCmdSetViewport(renderer) < 0) {
        return -1;
    }
    if (QueueCmdSetClipRect(renderer) < 0) {
        return -1;
    }

    /* All set! */
    return FlushRenderCommandsIfNotBatching(renderer);
}

SDL_Texture *
SDL_GetRenderTarget(SDL_Renderer *renderer)
{
    return renderer->target;
}

static int
UpdateLogicalSize(SDL_Renderer *renderer)
{
    int w = 1, h = 1;
    float want_aspect;
    float real_aspect;
    float scale;
    SDL_Rect viewport;
    /* 0 is for letterbox, 1 is for overscan */
    int scale_policy = 0;
    const char *hint;

    if (!renderer->logical_w || !renderer->logical_h) {
        return 0;
    }
    if (SDL_GetRendererOutputSize(renderer, &w, &h) < 0) {
        return -1;
    }

    hint = SDL_GetHint(SDL_HINT_RENDER_LOGICAL_SIZE_MODE);
    if (hint && (*hint == '1' || SDL_strcasecmp(hint, "overscan") == 0))  {
#if SDL_VIDEO_RENDER_D3D
        SDL_bool overscan_supported = SDL_TRUE;
        /* Unfortunately, Direct3D 9 doesn't support negative viewport numbers
           which the overscan implementation relies on.
        */
        if (SDL_strcasecmp(SDL_GetCurrentVideoDriver(), "direct3d") == 0) {
            overscan_supported = SDL_FALSE;
        }
        if (overscan_supported) {
            scale_policy = 1;
        }
#else
        scale_policy = 1;
#endif
    }

    want_aspect = (float)renderer->logical_w / renderer->logical_h;
    real_aspect = (float)w / h;

    /* Clear the scale because we're setting viewport in output coordinates */
    SDL_RenderSetScale(renderer, 1.0f, 1.0f);

    if (renderer->integer_scale) {
        if (want_aspect > real_aspect) {
            scale = (float)(w / renderer->logical_w);
        } else {
            scale = (float)(h / renderer->logical_h);
        }
        viewport.w = (int)SDL_floor(renderer->logical_w * scale);
        viewport.x = (w - viewport.w) / 2;
        viewport.h = (int)SDL_floor(renderer->logical_h * scale);
        viewport.y = (h - viewport.h) / 2;

        SDL_RenderSetViewport(renderer, &viewport);
    } else if (SDL_fabs(want_aspect-real_aspect) < 0.0001) {
        /* The aspect ratios are the same, just scale appropriately */
        scale = (float)w / renderer->logical_w;
        SDL_RenderSetViewport(renderer, NULL);
    } else if (want_aspect > real_aspect) {
        if (scale_policy == 1) {
            /* We want a wider aspect ratio than is available - 
             zoom so logical height matches the real height 
             and the width will grow off the screen 
             */
            scale = (float)h / renderer->logical_h;
            viewport.y = 0;
            viewport.h = h;
            viewport.w = (int)SDL_floor(renderer->logical_w * scale);
            viewport.x = (w - viewport.w) / 2;
            SDL_RenderSetViewport(renderer, &viewport);
        } else {
            /* We want a wider aspect ratio than is available - letterbox it */
            scale = (float)w / renderer->logical_w;
            viewport.x = 0;
            viewport.w = w;
            viewport.h = (int)SDL_floor(renderer->logical_h * scale);
            viewport.y = (h - viewport.h) / 2;
            SDL_RenderSetViewport(renderer, &viewport);
        }
    } else {
        if (scale_policy == 1) {
            /* We want a narrower aspect ratio than is available -
             zoom so logical width matches the real width
             and the height will grow off the screen
             */
            scale = (float)w / renderer->logical_w;
            viewport.x = 0;
            viewport.w = w;
            viewport.h = (int)SDL_floor(renderer->logical_h * scale);
            viewport.y = (h - viewport.h) / 2;
            SDL_RenderSetViewport(renderer, &viewport);
        } else {
            /* We want a narrower aspect ratio than is available - use side-bars */
             scale = (float)h / renderer->logical_h;
             viewport.y = 0;
             viewport.h = h;
             viewport.w = (int)SDL_floor(renderer->logical_w * scale);
             viewport.x = (w - viewport.w) / 2;
             SDL_RenderSetViewport(renderer, &viewport);
        }
    }

    /* Set the new scale */
    SDL_RenderSetScale(renderer, scale, scale);

    return 0;
}

int
SDL_RenderSetLogicalSize(SDL_Renderer * renderer, int w, int h)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!w || !h) {
        /* Clear any previous logical resolution */
        renderer->logical_w = 0;
        renderer->logical_h = 0;
        SDL_RenderSetViewport(renderer, NULL);
        SDL_RenderSetScale(renderer, 1.0f, 1.0f);
        return 0;
    }

    renderer->logical_w = w;
    renderer->logical_h = h;

    return UpdateLogicalSize(renderer);
}

void
SDL_RenderGetLogicalSize(SDL_Renderer * renderer, int *w, int *h)
{
    CHECK_RENDERER_MAGIC(renderer, );

    if (w) {
        *w = renderer->logical_w;
    }
    if (h) {
        *h = renderer->logical_h;
    }
}

int
SDL_RenderSetIntegerScale(SDL_Renderer * renderer, SDL_bool enable)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    renderer->integer_scale = enable;

    return UpdateLogicalSize(renderer);
}

SDL_bool
SDLCALL SDL_RenderGetIntegerScale(SDL_Renderer * renderer)
{
    CHECK_RENDERER_MAGIC(renderer, SDL_FALSE);

    return renderer->integer_scale;
}

int
SDL_RenderSetViewport(SDL_Renderer * renderer, const SDL_Rect * rect)
{
    int retval;
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (rect) {
        renderer->viewport.x = (int)SDL_floor(rect->x * renderer->scale.x);
        renderer->viewport.y = (int)SDL_floor(rect->y * renderer->scale.y);
        renderer->viewport.w = (int)SDL_floor(rect->w * renderer->scale.x);
        renderer->viewport.h = (int)SDL_floor(rect->h * renderer->scale.y);
    } else {
        renderer->viewport.x = 0;
        renderer->viewport.y = 0;
        if (SDL_GetRendererOutputSize(renderer, &renderer->viewport.w, &renderer->viewport.h) < 0) {
            return -1;
        }
    }
    retval = QueueCmdSetViewport(renderer);
    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

void
SDL_RenderGetViewport(SDL_Renderer * renderer, SDL_Rect * rect)
{
    CHECK_RENDERER_MAGIC(renderer, );

    if (rect) {
        rect->x = (int)(renderer->viewport.x / renderer->scale.x);
        rect->y = (int)(renderer->viewport.y / renderer->scale.y);
        rect->w = (int)(renderer->viewport.w / renderer->scale.x);
        rect->h = (int)(renderer->viewport.h / renderer->scale.y);
    }
}

static void
RenderGetViewportSize(SDL_Renderer * renderer, SDL_FRect * rect)
{
    rect->x = 0.0f;
    rect->y = 0.0f;
    rect->w = renderer->viewport.w / renderer->scale.x;
    rect->h = renderer->viewport.h / renderer->scale.y;
}

int
SDL_RenderSetClipRect(SDL_Renderer * renderer, const SDL_Rect * rect)
{
    int retval;
    CHECK_RENDERER_MAGIC(renderer, -1)

    if (rect) {
        renderer->clipping_enabled = SDL_TRUE;
        renderer->clip_rect.x = (int)SDL_floor(rect->x * renderer->scale.x);
        renderer->clip_rect.y = (int)SDL_floor(rect->y * renderer->scale.y);
        renderer->clip_rect.w = (int)SDL_floor(rect->w * renderer->scale.x);
        renderer->clip_rect.h = (int)SDL_floor(rect->h * renderer->scale.y);
    } else {
        renderer->clipping_enabled = SDL_FALSE;
        SDL_zero(renderer->clip_rect);
    }

    retval = QueueCmdSetClipRect(renderer);
    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

void
SDL_RenderGetClipRect(SDL_Renderer * renderer, SDL_Rect * rect)
{
    CHECK_RENDERER_MAGIC(renderer, )

    if (rect) {
        rect->x = (int)(renderer->clip_rect.x / renderer->scale.x);
        rect->y = (int)(renderer->clip_rect.y / renderer->scale.y);
        rect->w = (int)(renderer->clip_rect.w / renderer->scale.x);
        rect->h = (int)(renderer->clip_rect.h / renderer->scale.y);
    }
}

SDL_bool
SDL_RenderIsClipEnabled(SDL_Renderer * renderer)
{
    CHECK_RENDERER_MAGIC(renderer, SDL_FALSE)
    return renderer->clipping_enabled;
}

int
SDL_RenderSetScale(SDL_Renderer * renderer, float scaleX, float scaleY)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    renderer->scale.x = scaleX;
    renderer->scale.y = scaleY;
    return 0;
}

void
SDL_RenderGetScale(SDL_Renderer * renderer, float *scaleX, float *scaleY)
{
    CHECK_RENDERER_MAGIC(renderer, );

    if (scaleX) {
        *scaleX = renderer->scale.x;
    }
    if (scaleY) {
        *scaleY = renderer->scale.y;
    }
}

int
SDL_SetRenderDrawColor(SDL_Renderer * renderer,
                       Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    renderer->color.r = r;
    renderer->color.g = g;
    renderer->color.b = b;
    renderer->color.a = a;
    return 0;
}

int
SDL_GetRenderDrawColor(SDL_Renderer * renderer,
                       Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (r) {
        *r = renderer->color.r;
    }
    if (g) {
        *g = renderer->color.g;
    }
    if (b) {
        *b = renderer->color.b;
    }
    if (a) {
        *a = renderer->color.a;
    }
    return 0;
}

int
SDL_SetRenderDrawBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!IsSupportedBlendMode(renderer, blendMode)) {
        return SDL_Unsupported();
    }
    renderer->blendMode = blendMode;
    return 0;
}

int
SDL_GetRenderDrawBlendMode(SDL_Renderer * renderer, SDL_BlendMode *blendMode)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    *blendMode = renderer->blendMode;
    return 0;
}

int
SDL_RenderClear(SDL_Renderer * renderer)
{
    int retval;
    CHECK_RENDERER_MAGIC(renderer, -1);
    retval = QueueCmdClear(renderer);
    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}


/* !!! FIXME: delete all the duplicate code for the integer versions in 2.1,
   !!! FIXME:  making the floating point versions the only available APIs. */

int
SDL_RenderDrawPoint(SDL_Renderer * renderer, int x, int y)
{
    SDL_FPoint fpoint;
    fpoint.x = (float) x;
    fpoint.y = (float) y;
    return SDL_RenderDrawPointsF(renderer, &fpoint, 1);
}

int
SDL_RenderDrawPointF(SDL_Renderer * renderer, float x, float y)
{
    SDL_FPoint fpoint;
    fpoint.x = x;
    fpoint.y = y;
    return SDL_RenderDrawPointsF(renderer, &fpoint, 1);
}

static int
RenderDrawPointsWithRects(SDL_Renderer * renderer,
                          const SDL_Point * points, const int count)
{
    int retval = -1;
    SDL_bool isstack;
    SDL_FRect *frects = SDL_small_alloc(SDL_FRect, count, &isstack);
    int i;

    if (!frects) {
        return SDL_OutOfMemory();
    }

    for (i = 0; i < count; ++i) {
        frects[i].x = points[i].x * renderer->scale.x;
        frects[i].y = points[i].y * renderer->scale.y;
        frects[i].w = renderer->scale.x;
        frects[i].h = renderer->scale.y;
    }

    retval = QueueCmdFillRects(renderer, frects, count);

    SDL_small_free(frects, isstack);

    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

int
SDL_RenderDrawPoints(SDL_Renderer * renderer,
                     const SDL_Point * points, int count)
{
    SDL_FPoint *fpoints;
    int i;
    int retval;
    SDL_bool isstack;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!points) {
        return SDL_SetError("SDL_RenderDrawPoints(): Passed NULL points");
    }
    if (count < 1) {
        return 0;
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) {
        return RenderDrawPointsWithRects(renderer, points, count);
    }

    fpoints = SDL_small_alloc(SDL_FPoint, count, &isstack);
    if (!fpoints) {
        return SDL_OutOfMemory();
    }
    for (i = 0; i < count; ++i) {
        fpoints[i].x = points[i].x * renderer->scale.x;
        fpoints[i].y = points[i].y * renderer->scale.y;
    }

    retval = QueueCmdDrawPoints(renderer, fpoints, count);

    SDL_small_free(fpoints, isstack);

    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

static int
RenderDrawPointsWithRectsF(SDL_Renderer * renderer,
                           const SDL_FPoint * fpoints, const int count)
{
    int retval = -1;
    SDL_bool isstack;
    SDL_FRect *frects = SDL_small_alloc(SDL_FRect, count, &isstack);
    int i;

    if (!frects) {
        return SDL_OutOfMemory();
    }

    for (i = 0; i < count; ++i) {
        frects[i].x = fpoints[i].x * renderer->scale.x;
        frects[i].y = fpoints[i].y * renderer->scale.y;
        frects[i].w = renderer->scale.x;
        frects[i].h = renderer->scale.y;
    }

    retval = QueueCmdFillRects(renderer, frects, count);

    SDL_small_free(frects, isstack);

    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

int
SDL_RenderDrawPointsF(SDL_Renderer * renderer,
                      const SDL_FPoint * points, int count)
{
    SDL_FPoint *fpoints;
    int i;
    int retval;
    SDL_bool isstack;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!points) {
        return SDL_SetError("SDL_RenderDrawFPoints(): Passed NULL points");
    }
    if (count < 1) {
        return 0;
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) {
        return RenderDrawPointsWithRectsF(renderer, points, count);
    }

    fpoints = SDL_small_alloc(SDL_FPoint, count, &isstack);
    if (!fpoints) {
        return SDL_OutOfMemory();
    }
    for (i = 0; i < count; ++i) {
        fpoints[i].x = points[i].x * renderer->scale.x;
        fpoints[i].y = points[i].y * renderer->scale.y;
    }

    retval = QueueCmdDrawPoints(renderer, fpoints, count);

    SDL_small_free(fpoints, isstack);

    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

int
SDL_RenderDrawLine(SDL_Renderer * renderer, int x1, int y1, int x2, int y2)
{
    SDL_FPoint points[2];
    points[0].x = (float) x1;
    points[0].y = (float) y1;
    points[1].x = (float) x2;
    points[1].y = (float) y2;
    return SDL_RenderDrawLinesF(renderer, points, 2);
}

int
SDL_RenderDrawLineF(SDL_Renderer * renderer, float x1, float y1, float x2, float y2)
{
    SDL_FPoint points[2];
    points[0].x = x1;
    points[0].y = y1;
    points[1].x = x2;
    points[1].y = y2;
    return SDL_RenderDrawLinesF(renderer, points, 2);
}

static int
RenderDrawLinesWithRects(SDL_Renderer * renderer,
                     const SDL_Point * points, const int count)
{
    SDL_FRect *frect;
    SDL_FRect *frects;
    SDL_FPoint fpoints[2];
    int i, nrects = 0;
    int retval = 0;
    SDL_bool isstack;

    frects = SDL_small_alloc(SDL_FRect, count-1, &isstack);
    if (!frects) {
        return SDL_OutOfMemory();
    }

    for (i = 0; i < count-1; ++i) {
        if (points[i].x == points[i+1].x) {
            const int minY = SDL_min(points[i].y, points[i+1].y);
            const int maxY = SDL_max(points[i].y, points[i+1].y);

            frect = &frects[nrects++];
            frect->x = points[i].x * renderer->scale.x;
            frect->y = minY * renderer->scale.y;
            frect->w = renderer->scale.x;
            frect->h = (maxY - minY + 1) * renderer->scale.y;
        } else if (points[i].y == points[i+1].y) {
            const int minX = SDL_min(points[i].x, points[i+1].x);
            const int maxX = SDL_max(points[i].x, points[i+1].x);

            frect = &frects[nrects++];
            frect->x = minX * renderer->scale.x;
            frect->y = points[i].y * renderer->scale.y;
            frect->w = (maxX - minX + 1) * renderer->scale.x;
            frect->h = renderer->scale.y;
        } else {
            /* FIXME: We can't use a rect for this line... */
            fpoints[0].x = points[i].x * renderer->scale.x;
            fpoints[0].y = points[i].y * renderer->scale.y;
            fpoints[1].x = points[i+1].x * renderer->scale.x;
            fpoints[1].y = points[i+1].y * renderer->scale.y;
            retval += QueueCmdDrawLines(renderer, fpoints, 2);
        }
    }

    if (nrects) {
        retval += QueueCmdFillRects(renderer, frects, nrects);
    }

    SDL_small_free(frects, isstack);

    if (retval < 0) {
        retval = -1;
    }
    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

static int
RenderDrawLinesWithRectsF(SDL_Renderer * renderer,
                          const SDL_FPoint * points, const int count)
{
    SDL_FRect *frect;
    SDL_FRect *frects;
    SDL_FPoint fpoints[2];
    int i, nrects = 0;
    int retval = 0;
    SDL_bool isstack;

    frects = SDL_small_alloc(SDL_FRect, count-1, &isstack);
    if (!frects) {
        return SDL_OutOfMemory();
    }

    for (i = 0; i < count-1; ++i) {
        if (points[i].x == points[i+1].x) {
            const int minY = (int)SDL_min(points[i].y, points[i+1].y);
            const int maxY = (int)SDL_max(points[i].y, points[i+1].y);

            frect = &frects[nrects++];
            frect->x = points[i].x * renderer->scale.x;
            frect->y = minY * renderer->scale.y;
            frect->w = renderer->scale.x;
            frect->h = (maxY - minY + 1) * renderer->scale.y;
        } else if (points[i].y == points[i+1].y) {
            const int minX = (int)SDL_min(points[i].x, points[i+1].x);
            const int maxX = (int)SDL_max(points[i].x, points[i+1].x);

            frect = &frects[nrects++];
            frect->x = minX * renderer->scale.x;
            frect->y = points[i].y * renderer->scale.y;
            frect->w = (maxX - minX + 1) * renderer->scale.x;
            frect->h = renderer->scale.y;
        } else {
            /* FIXME: We can't use a rect for this line... */
            fpoints[0].x = points[i].x * renderer->scale.x;
            fpoints[0].y = points[i].y * renderer->scale.y;
            fpoints[1].x = points[i+1].x * renderer->scale.x;
            fpoints[1].y = points[i+1].y * renderer->scale.y;
            retval += QueueCmdDrawLines(renderer, fpoints, 2);
        }
    }

    if (nrects) {
        retval += QueueCmdFillRects(renderer, frects, nrects);
    }

    SDL_small_free(frects, isstack);

    if (retval < 0) {
        retval = -1;
    }
    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

int
SDL_RenderDrawLines(SDL_Renderer * renderer,
                    const SDL_Point * points, int count)
{
    SDL_FPoint *fpoints;
    int i;
    int retval;
    SDL_bool isstack;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!points) {
        return SDL_SetError("SDL_RenderDrawLines(): Passed NULL points");
    }
    if (count < 2) {
        return 0;
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) {
        return RenderDrawLinesWithRects(renderer, points, count);
    }

    fpoints = SDL_small_alloc(SDL_FPoint, count, &isstack);
    if (!fpoints) {
        return SDL_OutOfMemory();
    }
    for (i = 0; i < count; ++i) {
        fpoints[i].x = points[i].x * renderer->scale.x;
        fpoints[i].y = points[i].y * renderer->scale.y;
    }

    retval = QueueCmdDrawLines(renderer, fpoints, count);

    SDL_small_free(fpoints, isstack);

    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

int
SDL_RenderDrawLinesF(SDL_Renderer * renderer,
                     const SDL_FPoint * points, int count)
{
    SDL_FPoint *fpoints;
    int i;
    int retval;
    SDL_bool isstack;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!points) {
        return SDL_SetError("SDL_RenderDrawLines(): Passed NULL points");
    }
    if (count < 2) {
        return 0;
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    if (renderer->scale.x != 1.0f || renderer->scale.y != 1.0f) {
        return RenderDrawLinesWithRectsF(renderer, points, count);
    }

    fpoints = SDL_small_alloc(SDL_FPoint, count, &isstack);
    if (!fpoints) {
        return SDL_OutOfMemory();
    }
    for (i = 0; i < count; ++i) {
        fpoints[i].x = points[i].x * renderer->scale.x;
        fpoints[i].y = points[i].y * renderer->scale.y;
    }

    retval = QueueCmdDrawLines(renderer, fpoints, count);

    SDL_small_free(fpoints, isstack);

    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

int
SDL_RenderDrawRect(SDL_Renderer * renderer, const SDL_Rect * rect)
{
    SDL_FRect frect;
    SDL_FRect *prect = NULL;

    if (rect) {
        frect.x = (float) rect->x;
        frect.y = (float) rect->y;
        frect.w = (float) rect->w;
        frect.h = (float) rect->h;
        prect = &frect;
    }

    return SDL_RenderDrawRectF(renderer, prect);
}

int
SDL_RenderDrawRectF(SDL_Renderer * renderer, const SDL_FRect * rect)
{
    SDL_FRect frect;
    SDL_FPoint points[5];

    CHECK_RENDERER_MAGIC(renderer, -1);

    /* If 'rect' == NULL, then outline the whole surface */
    if (!rect) {
        RenderGetViewportSize(renderer, &frect);
        rect = &frect;
    }

    points[0].x = rect->x;
    points[0].y = rect->y;
    points[1].x = rect->x+rect->w-1;
    points[1].y = rect->y;
    points[2].x = rect->x+rect->w-1;
    points[2].y = rect->y+rect->h-1;
    points[3].x = rect->x;
    points[3].y = rect->y+rect->h-1;
    points[4].x = rect->x;
    points[4].y = rect->y;
    return SDL_RenderDrawLinesF(renderer, points, 5);
}

int
SDL_RenderDrawRects(SDL_Renderer * renderer,
                    const SDL_Rect * rects, int count)
{
    int i;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!rects) {
        return SDL_SetError("SDL_RenderDrawRects(): Passed NULL rects");
    }
    if (count < 1) {
        return 0;
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    for (i = 0; i < count; ++i) {
        if (SDL_RenderDrawRect(renderer, &rects[i]) < 0) {
            return -1;
        }
    }
    return 0;
}

int
SDL_RenderDrawRectsF(SDL_Renderer * renderer,
                     const SDL_FRect * rects, int count)
{
    int i;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!rects) {
        return SDL_SetError("SDL_RenderDrawRects(): Passed NULL rects");
    }
    if (count < 1) {
        return 0;
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    for (i = 0; i < count; ++i) {
        if (SDL_RenderDrawRectF(renderer, &rects[i]) < 0) {
            return -1;
        }
    }
    return 0;
}

int
SDL_RenderFillRect(SDL_Renderer * renderer, const SDL_Rect * rect)
{
    SDL_FRect frect;

    CHECK_RENDERER_MAGIC(renderer, -1);

    /* If 'rect' == NULL, then outline the whole surface */
    if (rect) {
        frect.x = (float) rect->x;
        frect.y = (float) rect->y;
        frect.w = (float) rect->w;
        frect.h = (float) rect->h;
    } else {
        RenderGetViewportSize(renderer, &frect);
    }
    return SDL_RenderFillRectsF(renderer, &frect, 1);
}

int
SDL_RenderFillRectF(SDL_Renderer * renderer, const SDL_FRect * rect)
{
    SDL_FRect frect;

    CHECK_RENDERER_MAGIC(renderer, -1);

    /* If 'rect' == NULL, then outline the whole surface */
    if (!rect) {
        RenderGetViewportSize(renderer, &frect);
        rect = &frect;
    }
    return SDL_RenderFillRectsF(renderer, rect, 1);
}

int
SDL_RenderFillRects(SDL_Renderer * renderer,
                    const SDL_Rect * rects, int count)
{
    SDL_FRect *frects;
    int i;
    int retval;
    SDL_bool isstack;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!rects) {
        return SDL_SetError("SDL_RenderFillRects(): Passed NULL rects");
    }
    if (count < 1) {
        return 0;
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    frects = SDL_small_alloc(SDL_FRect, count, &isstack);
    if (!frects) {
        return SDL_OutOfMemory();
    }
    for (i = 0; i < count; ++i) {
        frects[i].x = rects[i].x * renderer->scale.x;
        frects[i].y = rects[i].y * renderer->scale.y;
        frects[i].w = rects[i].w * renderer->scale.x;
        frects[i].h = rects[i].h * renderer->scale.y;
    }

    retval = QueueCmdFillRects(renderer, frects, count);

    SDL_small_free(frects, isstack);

    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

int
SDL_RenderFillRectsF(SDL_Renderer * renderer,
                     const SDL_FRect * rects, int count)
{
    SDL_FRect *frects;
    int i;
    int retval;
    SDL_bool isstack;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!rects) {
        return SDL_SetError("SDL_RenderFillFRects(): Passed NULL rects");
    }
    if (count < 1) {
        return 0;
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    frects = SDL_small_alloc(SDL_FRect, count, &isstack);
    if (!frects) {
        return SDL_OutOfMemory();
    }
    for (i = 0; i < count; ++i) {
        frects[i].x = rects[i].x * renderer->scale.x;
        frects[i].y = rects[i].y * renderer->scale.y;
        frects[i].w = rects[i].w * renderer->scale.x;
        frects[i].h = rects[i].h * renderer->scale.y;
    }

    retval = QueueCmdFillRects(renderer, frects, count);

    SDL_small_free(frects, isstack);

    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

/* !!! FIXME: move this to a public API if we want to do float versions of all of these later */
SDL_FORCE_INLINE SDL_bool SDL_FRectEmpty(const SDL_FRect *r)
{
    return ((!r) || (r->w <= 0.0f) || (r->h <= 0.0f)) ? SDL_TRUE : SDL_FALSE;
}

/* !!! FIXME: move this to a public API if we want to do float versions of all of these later */
static SDL_bool
SDL_HasIntersectionF(const SDL_FRect * A, const SDL_FRect * B)
{
    float Amin, Amax, Bmin, Bmax;

    if (!A) {
        SDL_InvalidParamError("A");
        return SDL_FALSE;
    }

    if (!B) {
        SDL_InvalidParamError("B");
        return SDL_FALSE;
    }

    /* Special cases for empty rects */
    if (SDL_FRectEmpty(A) || SDL_FRectEmpty(B)) {
        return SDL_FALSE;
    }

    /* Horizontal intersection */
    Amin = A->x;
    Amax = Amin + A->w;
    Bmin = B->x;
    Bmax = Bmin + B->w;
    if (Bmin > Amin)
        Amin = Bmin;
    if (Bmax < Amax)
        Amax = Bmax;
    if (Amax <= Amin)
        return SDL_FALSE;

    /* Vertical intersection */
    Amin = A->y;
    Amax = Amin + A->h;
    Bmin = B->y;
    Bmax = Bmin + B->h;
    if (Bmin > Amin)
        Amin = Bmin;
    if (Bmax < Amax)
        Amax = Bmax;
    if (Amax <= Amin)
        return SDL_FALSE;

    return SDL_TRUE;
}

int
SDL_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
               const SDL_Rect * srcrect, const SDL_Rect * dstrect)
{
    SDL_FRect dstfrect;
    SDL_FRect *pdstfrect = NULL;
    if (dstrect) {
        dstfrect.x = (float) dstrect->x;
        dstfrect.y = (float) dstrect->y;
        dstfrect.w = (float) dstrect->w;
        dstfrect.h = (float) dstrect->h;
        pdstfrect = &dstfrect;
    }
    return SDL_RenderCopyF(renderer, texture, srcrect, pdstfrect);
}

int
SDL_RenderCopyF(SDL_Renderer * renderer, SDL_Texture * texture,
                const SDL_Rect * srcrect, const SDL_FRect * dstrect)
{
    SDL_Rect real_srcrect;
    SDL_FRect real_dstrect;
    int retval;

    CHECK_RENDERER_MAGIC(renderer, -1);
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (renderer != texture->renderer) {
        return SDL_SetError("Texture was not created with this renderer");
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    real_srcrect.x = 0;
    real_srcrect.y = 0;
    real_srcrect.w = texture->w;
    real_srcrect.h = texture->h;
    if (srcrect) {
        if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) {
            return 0;
        }
    }

    RenderGetViewportSize(renderer, &real_dstrect);
    if (dstrect) {
        if (!SDL_HasIntersectionF(dstrect, &real_dstrect)) {
            return 0;
        }
        real_dstrect = *dstrect;
    }

    if (texture->native) {
        texture = texture->native;
    }

    texture->last_command_generation = renderer->render_command_generation;

    if (renderer->QueueGeometry && renderer->QueueCopy == NULL) {
        float xy[8];
        const int xy_stride = 2 * sizeof (float);
        float uv[8];
        const int uv_stride = 2 * sizeof (float);
        const int num_vertices = 4;
        const int indices[6] = {0, 1, 2, 0, 2, 3};
        const int num_indices = 6;
        const int size_indices = 4;
        float minu, minv, maxu, maxv;
        float minx, miny, maxx, maxy;

        minu = (float) (real_srcrect.x) / (float) texture->w;
        minv = (float) (real_srcrect.y) / (float) texture->h;
        maxu = (float) (real_srcrect.x + real_srcrect.w) / (float) texture->w;
        maxv = (float) (real_srcrect.y + real_srcrect.h) / (float) texture->h;

        minx = real_dstrect.x;
        miny = real_dstrect.y;
        maxx = real_dstrect.x + real_dstrect.w;
        maxy = real_dstrect.y + real_dstrect.h;

        uv[0] = minu;
        uv[1] = minv;
        uv[2] = maxu;
        uv[3] = minv;
        uv[4] = maxu;
        uv[5] = maxv;
        uv[6] = minu;
        uv[7] = maxv;

        xy[0] = minx;
        xy[1] = miny;
        xy[2] = maxx;
        xy[3] = miny;
        xy[4] = maxx;
        xy[5] = maxy;
        xy[6] = minx;
        xy[7] = maxy;

        retval = QueueCmdGeometry(renderer, texture,
                xy, xy_stride, (int *)&texture->color, 0 /* color_stride */, uv, uv_stride,
                num_vertices,
                indices, num_indices, size_indices,
                renderer->scale.x, renderer->scale.y);
    } else {

        real_dstrect.x *= renderer->scale.x;
        real_dstrect.y *= renderer->scale.y;
        real_dstrect.w *= renderer->scale.x;
        real_dstrect.h *= renderer->scale.y;

        retval = QueueCmdCopy(renderer, texture, &real_srcrect, &real_dstrect);
    }
    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}

int
SDL_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
               const SDL_Rect * srcrect, const SDL_Rect * dstrect,
               const double angle, const SDL_Point *center, const SDL_RendererFlip flip)
{
    SDL_FRect dstfrect;
    SDL_FRect *pdstfrect = NULL;
    SDL_FPoint fcenter;
    SDL_FPoint *pfcenter = NULL;

    if (dstrect) {
        dstfrect.x = (float) dstrect->x;
        dstfrect.y = (float) dstrect->y;
        dstfrect.w = (float) dstrect->w;
        dstfrect.h = (float) dstrect->h;
        pdstfrect = &dstfrect;
    }

    if (center) {
        fcenter.x = (float) center->x;
        fcenter.y = (float) center->y;
        pfcenter = &fcenter;
    }

    return SDL_RenderCopyExF(renderer, texture, srcrect, pdstfrect, angle, pfcenter, flip);
}

int
SDL_RenderCopyExF(SDL_Renderer * renderer, SDL_Texture * texture,
               const SDL_Rect * srcrect, const SDL_FRect * dstrect,
               const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
{
    SDL_Rect real_srcrect;
    SDL_FRect real_dstrect;
    SDL_FPoint real_center;
    int retval;

    if (flip == SDL_FLIP_NONE && (int)(angle/360) == angle/360) { /* fast path when we don't need rotation or flipping */
        return SDL_RenderCopyF(renderer, texture, srcrect, dstrect);
    }

    CHECK_RENDERER_MAGIC(renderer, -1);
    CHECK_TEXTURE_MAGIC(texture, -1);

    if (renderer != texture->renderer) {
        return SDL_SetError("Texture was not created with this renderer");
    }
    if (!renderer->QueueCopyEx && !renderer->QueueGeometry) {
        return SDL_SetError("Renderer does not support RenderCopyEx");
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    real_srcrect.x = 0;
    real_srcrect.y = 0;
    real_srcrect.w = texture->w;
    real_srcrect.h = texture->h;
    if (srcrect) {
        if (!SDL_IntersectRect(srcrect, &real_srcrect, &real_srcrect)) {
            return 0;
        }
    }

    /* We don't intersect the dstrect with the viewport as RenderCopy does because of potential rotation clipping issues... TODO: should we? */
    if (dstrect) {
        real_dstrect = *dstrect;
    } else {
        RenderGetViewportSize(renderer, &real_dstrect);
    }

    if (texture->native) {
        texture = texture->native;
    }

    if (center) {
        real_center = *center;
    } else {
        real_center.x = real_dstrect.w / 2.0f;
        real_center.y = real_dstrect.h / 2.0f;
    }

    texture->last_command_generation = renderer->render_command_generation;

    if (renderer->QueueGeometry && renderer->QueueCopyEx == NULL) {
        float xy[8];
        const int xy_stride = 2 * sizeof (float);
        float uv[8];
        const int uv_stride = 2 * sizeof (float);
        const int num_vertices = 4;
        const int indices[6] = {0, 1, 2, 0, 2, 3};
        const int num_indices = 6;
        const int size_indices = 4;
        float minu, minv, maxu, maxv;
        float minx, miny, maxx, maxy;
        float centerx, centery;

        float s_minx, s_miny, s_maxx, s_maxy;
        float c_minx, c_miny, c_maxx, c_maxy;

        const float radian_angle = (float)((M_PI * angle) / 180.0);
        const float s = SDL_sin(radian_angle);
        const float c = SDL_cos(radian_angle);

        minu = (float) (real_srcrect.x) / (float) texture->w;
        minv = (float) (real_srcrect.y) / (float) texture->h;
        maxu = (float) (real_srcrect.x + real_srcrect.w) / (float) texture->w;
        maxv = (float) (real_srcrect.y + real_srcrect.h) / (float) texture->h;

        centerx = real_center.x + real_dstrect.x;
        centery = real_center.y + real_dstrect.y;

        if (flip & SDL_FLIP_HORIZONTAL) {
            minx = real_dstrect.x + real_dstrect.w;
            maxx = real_dstrect.x;
        } else {
            minx = real_dstrect.x;
            maxx = real_dstrect.x + real_dstrect.w;
        }

        if (flip & SDL_FLIP_VERTICAL) {
            miny = real_dstrect.y + real_dstrect.h;
            maxy = real_dstrect.y;
        } else {
            miny = real_dstrect.y;
            maxy = real_dstrect.y + real_dstrect.h;
        }

        uv[0] = minu;
        uv[1] = minv;
        uv[2] = maxu;
        uv[3] = minv;
        uv[4] = maxu;
        uv[5] = maxv;
        uv[6] = minu;
        uv[7] = maxv;

        /* apply rotation with 2x2 matrix ( c -s )
         *                                ( s  c ) */
        s_minx = s * (minx - centerx);
        s_miny = s * (miny - centery);
        s_maxx = s * (maxx - centerx);
        s_maxy = s * (maxy - centery);
        c_minx = c * (minx - centerx);
        c_miny = c * (miny - centery);
        c_maxx = c * (maxx - centerx);
        c_maxy = c * (maxy - centery);

        /* (minx, miny) */
        xy[0] = (c_minx - s_miny) + centerx;
        xy[1] = (s_minx + c_miny) + centery;
        /* (maxx, miny) */
        xy[2] = (c_maxx - s_miny) + centerx;
        xy[3] = (s_maxx + c_miny) + centery;
        /* (maxx, maxy) */
        xy[4] = (c_maxx - s_maxy) + centerx;
        xy[5] = (s_maxx + c_maxy) + centery;
        /* (minx, maxy) */
        xy[6] = (c_minx - s_maxy) + centerx;
        xy[7] = (s_minx + c_maxy) + centery;

        retval = QueueCmdGeometry(renderer, texture,
                xy, xy_stride, (int *)&texture->color, 0 /* color_stride */, uv, uv_stride,
                num_vertices,
                indices, num_indices, size_indices,
                renderer->scale.x, renderer->scale.y);
    } else {

        real_dstrect.x *= renderer->scale.x;
        real_dstrect.y *= renderer->scale.y;
        real_dstrect.w *= renderer->scale.x;
        real_dstrect.h *= renderer->scale.y;

        real_center.x *= renderer->scale.x;
        real_center.y *= renderer->scale.y;

        retval = QueueCmdCopyEx(renderer, texture, &real_srcrect, &real_dstrect, angle, &real_center, flip);
    }
    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}


#define SDL_OFFSETOF(_TYPE,_MEMBER)  ((intptr_t)&(((_TYPE*)0)->_MEMBER))
int
SDL_RenderGeometry(SDL_Renderer *renderer,
                               SDL_Texture *texture,
                               const SDL_Vertex *vertices, int num_vertices,
                               const int *indices, int num_indices)
{
    const float *xy = (const float *)((const Uint8 *)vertices + SDL_OFFSETOF(SDL_Vertex, position));
    int xy_stride = sizeof (SDL_Vertex);
    const int *color = (const int *) ((const Uint8 *)vertices + SDL_OFFSETOF(SDL_Vertex, color));
    int color_stride = sizeof (SDL_Vertex);
    const float *uv = (const float *)((const Uint8 *)vertices + SDL_OFFSETOF(SDL_Vertex, tex_coord));
    int uv_stride = sizeof (SDL_Vertex);
    int size_indices = 4;

    return SDL_RenderGeometryRaw(renderer, texture, xy, xy_stride, color, color_stride, uv, uv_stride, num_vertices, indices, num_indices, size_indices);
}

static int
remap_one_indice(
        int prev,
        int k,
        SDL_Texture *texture,
        const float *xy, int xy_stride,
        const int *color, int color_stride,
        const float *uv, int uv_stride)
{
    const float *xy0_, *xy1_, *uv0_, *uv1_;
    int col0_, col1_;
    xy0_ = (const float *)((const char*)xy + prev * xy_stride);
    xy1_ = (const float *)((const char*)xy + k * xy_stride);
    if (xy0_[0] != xy1_[0]) {
        return k;
    }
    if (xy0_[1] != xy1_[1]) {
        return k;
    }
    if (texture) {
        uv0_ = (const float *)((const char*)uv + prev * uv_stride);
        uv1_ = (const float *)((const char*)uv + k * uv_stride);
        if (uv0_[0] != uv1_[0]) {
            return k;
        }
        if (uv0_[1] != uv1_[1]) {
            return k;
        }
    }
    col0_ = *(const int *)((const char*)color + prev * color_stride);
    col1_ = *(const int *)((const char*)color + k * color_stride);

    if (col0_ != col1_) {
        return k;
    }

    return prev;
}

static int
remap_indices(
        int prev[3],
        int k,
        SDL_Texture *texture,
        const float *xy, int xy_stride,
        const int *color, int color_stride,
        const float *uv, int uv_stride)
{
    int i;
    if (prev[0] == -1) {
        return k;
    }

    for (i = 0; i < 3; i++) {
        int new_k = remap_one_indice(prev[i], k, texture, xy, xy_stride, color, color_stride, uv, uv_stride);
        if (new_k != k) {
            return new_k;
        }
    }
    return k;
}

#define DEBUG_SW_RENDER_GEOMETRY 0
/* For the software renderer, try to reinterpret triangles as SDL_Rect */
static int SDLCALL
SDL_SW_RenderGeometryRaw(SDL_Renderer *renderer,
                         SDL_Texture *texture,
                         const float *xy, int xy_stride,
                         const int *color, int color_stride,
                         const float *uv, int uv_stride,
                         int num_vertices,
                         const void *indices, int num_indices, int size_indices)
{
    int i;
    int retval = 0;
    int count = indices ? num_indices : num_vertices;
    int prev[3]; /* Previous triangle vertex indices */
    int texw = 0, texh = 0;
    SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
    Uint8 r = 0, g = 0, b = 0, a = 0;

    /* Save */
    SDL_GetRenderDrawBlendMode(renderer, &blendMode);
    SDL_GetRenderDrawColor(renderer, &r, &g, &b, &a);

    if (texture) {
        SDL_QueryTexture(texture, NULL, NULL, &texw, &texh);
    }

    prev[0] = -1; prev[1] = -1; prev[2] = -1;
    size_indices = indices ? size_indices : 0;

    for (i = 0; i < count; i += 3) {
        int k0, k1, k2; /* Current triangle indices */
        int is_quad = 1;
#if DEBUG_SW_RENDER_GEOMETRY
        int is_uniform = 1;
        int is_rectangle = 1;
#endif
        int A = -1;  /* Top left vertex */
        int B = -1;  /* Bottom right vertex */
        int C = -1;  /* Third vertex of current triangle */
        int C2 = -1; /* Last, vertex of previous triangle */

        if (size_indices == 4) {
            k0 = ((const Uint32 *)indices)[i];
            k1 = ((const Uint32 *)indices)[i + 1];
            k2 = ((const Uint32 *)indices)[i + 2];
        } else if (size_indices == 2) {
            k0 = ((const Uint16 *)indices)[i];
            k1 = ((const Uint16 *)indices)[i + 1];
            k2 = ((const Uint16 *)indices)[i + 2];
        } else if (size_indices == 1) {
            k0 = ((const Uint8 *)indices)[i];
            k1 = ((const Uint8 *)indices)[i + 1];
            k2 = ((const Uint8 *)indices)[i + 2];
        } else {
            /* Vertices were not provided by indices. Maybe some are duplicated.
             * We try to indentificate the duplicates by comparing with the previous three vertices */
            k0 = remap_indices(prev, i, texture, xy, xy_stride, color, color_stride, uv, uv_stride);
            k1 = remap_indices(prev, i + 1, texture, xy, xy_stride, color, color_stride, uv, uv_stride);
            k2 = remap_indices(prev, i + 2, texture, xy, xy_stride, color, color_stride, uv, uv_stride);
        }

        if (prev[0] == -1) {
            prev[0] = k0;
            prev[1] = k1;
            prev[2] = k2;
            continue;
        }

        /* Two triangles forming a quadialateral,
         * prev and current triangles must have exactly 2 common vertices */
        {
            int cnt = 0, j = 3;
            while (j--) {
                int p = prev[j];
                if (p == k0 || p == k1 || p == k2) {
                    cnt++;
                }
            }
            is_quad = (cnt == 2);
        }

        /* Identify vertices */
        if (is_quad) {
            const float *xy0_, *xy1_, *xy2_;
            float x0, x1, x2;
            float y0, y1, y2;
            xy0_ = (const float *)((const char*)xy + k0 * xy_stride);
            xy1_ = (const float *)((const char*)xy + k1 * xy_stride);
            xy2_ = (const float *)((const char*)xy + k2 * xy_stride);
            x0 = xy0_[0]; y0 = xy0_[1];
            x1 = xy1_[0]; y1 = xy1_[1];
            x2 = xy2_[0]; y2 = xy2_[1];

            /* Find top-left */
            if (x0 <= x1 && y0 <= y1) {
                if (x0 <= x2 && y0 <= y2) {
                    A = k0;
                } else {
                    A = k2;
                }
            } else {
                if (x1 <= x2 && y1 <= y2) {
                    A = k1;
                } else {
                    A = k2;
                }
            }

            /* Find bottom-right */
            if (x0 >= x1 && y0 >= y1) {
                if (x0 >= x2 && y0 >= y2) {
                    B = k0;
                } else {
                    B = k2;
                }
            } else {
                if (x1 >= x2 && y1 >= y2) {
                    B = k1;
                } else {
                    B = k2;
                }
            }

            /* Find C */
            if (k0 != A && k0 != B) {
                C = k0;
            } else if (k1 != A && k1 != B) {
                C = k1;
            } else {
                C = k2;
            }

            /* Find C2 */
            if (prev[0] != A && prev[0] != B) {
                C2 = prev[0];
            } else if (prev[1] != A && prev[1] != B) {
                C2 = prev[1];
            } else {
                C2 = prev[2];
            }

            xy0_ = (const float *)((const char*)xy + A * xy_stride);
            xy1_ = (const float *)((const char*)xy + B * xy_stride);
            xy2_ = (const float *)((const char*)xy + C * xy_stride);
            x0 = xy0_[0]; y0 = xy0_[1];
            x1 = xy1_[0]; y1 = xy1_[1];
            x2 = xy2_[0]; y2 = xy2_[1];

            /* Check if triangle A B C is rectangle */
            if ((x0 == x2 && y1 == y2) || (y0 == y2 && x1 == x2)){
                /* ok */
            } else {
                is_quad = 0;
#if DEBUG_SW_RENDER_GEOMETRY
                is_rectangle = 0;
#endif
            }

            xy2_ = (const float *)((const char*)xy + C2 * xy_stride);
            x2 = xy2_[0]; y2 = xy2_[1];

            /* Check if triangle A B C2 is rectangle */
            if ((x0 == x2 && y1 == y2) || (y0 == y2 && x1 == x2)){
                /* ok */
            } else {
                is_quad = 0;
#if DEBUG_SW_RENDER_GEOMETRY
                is_rectangle = 0;
#endif
            }
        }

        /* Check if uniformly colored */
        if (is_quad) {
            const int col0_ = *(const int *)((const char*)color + A * color_stride);
            const int col1_ = *(const int *)((const char*)color + B * color_stride);
            const int col2_ = *(const int *)((const char*)color + C * color_stride);
            const int col3_ = *(const int *)((const char*)color + C2 * color_stride);
            if (col0_ == col1_ && col0_ == col2_ && col0_ == col3_) {
                /* ok */
            } else {
                is_quad = 0;
#if DEBUG_SW_RENDER_GEOMETRY
                is_uniform = 0;
#endif
            }
        }

        /* Start rendering rect */
        if (is_quad) {
            SDL_Rect s;
            SDL_FRect d;
            const float *xy0_, *xy1_, *uv0_, *uv1_;
            SDL_Color col0_ = *(const SDL_Color *)((const char*)color + k0 * color_stride);

            xy0_ = (const float *)((const char*)xy + A * xy_stride);
            xy1_ = (const float *)((const char*)xy + B * xy_stride);

            if (texture) {
                uv0_ = (const float *)((const char*)uv + A * uv_stride);
                uv1_ = (const float *)((const char*)uv + B * uv_stride);
                s.x = (int) (uv0_[0] * texw);
                s.y = (int) (uv0_[1] * texh);
                s.w = (int) (uv1_[0] * texw - s.x);
                s.h = (int) (uv1_[1] * texh - s.y);
            }

            d.x = xy0_[0];
            d.y = xy0_[1];
            d.w = xy1_[0] - d.x;
            d.h = xy1_[1] - d.y;

            /* Rect + texture */
            if (texture && s.w != 0 && s.h != 0) {
                SDL_SetTextureAlphaMod(texture, col0_.a);
                SDL_SetTextureColorMod(texture, col0_.r, col0_.g, col0_.b);
                SDL_RenderCopyF(renderer, texture, &s, &d);
#if DEBUG_SW_RENDER_GEOMETRY
                SDL_Log("Rect-COPY: RGB %d %d %d - Alpha:%d - texture=%p: src=(%d,%d, %d x %d) dst (%f, %f, %f x %f)", col0_.r, col0_.g, col0_.b, col0_.a,
                        (void *)texture, s.x, s.y, s.w, s.h, d.x, d.y, d.w, d.h);
#endif
            } else if (d.w != 0.0f && d.h != 0.0f) { /* Rect, no texture */
                SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
                SDL_SetRenderDrawColor(renderer, col0_.r, col0_.g, col0_.b, col0_.a);
                SDL_RenderFillRectF(renderer, &d);
#if DEBUG_SW_RENDER_GEOMETRY
                SDL_Log("Rect-FILL: RGB %d %d %d - Alpha:%d - texture=%p: src=(%d,%d, %d x %d) dst (%f, %f, %f x %f)", col0_.r, col0_.g, col0_.b, col0_.a,
                        (void *)texture, s.x, s.y, s.w, s.h, d.x, d.y, d.w, d.h);
            } else {
                SDL_Log("Rect-DISMISS: RGB %d %d %d - Alpha:%d - texture=%p: src=(%d,%d, %d x %d) dst (%f, %f, %f x %f)", col0_.r, col0_.g, col0_.b, col0_.a,
                        (void *)texture, s.x, s.y, s.w, s.h, d.x, d.y, d.w, d.h);
#endif
            }

            prev[0] = -1;
        } else {
            /* Render triangles */
            if (prev[0] != -1) {
#if DEBUG_SW_RENDER_GEOMETRY
                SDL_Log("Triangle %d %d %d - is_uniform:%d is_rectangle:%d", prev[0], prev[1], prev[2], is_uniform, is_rectangle);
#endif
                retval = QueueCmdGeometry(renderer, texture,
                                          xy, xy_stride, color, color_stride, uv, uv_stride,
                                          num_vertices, prev, 3, 4, renderer->scale.x, renderer->scale.y);
                if (retval < 0) {
                    goto end;
                } else {
                    FlushRenderCommandsIfNotBatching(renderer);
                }
            }

            prev[0] = k0;
            prev[1] = k1;
            prev[2] = k2;
        }
    } /* End for(), next triangle */

    if (prev[0] != -1) {
        /* flush the last triangle */
#if DEBUG_SW_RENDER_GEOMETRY
        SDL_Log("Last triangle %d %d %d", prev[0], prev[1], prev[2]);
#endif
        retval = QueueCmdGeometry(renderer, texture,
                                  xy, xy_stride, color, color_stride, uv, uv_stride,
                                  num_vertices, prev, 3, 4, renderer->scale.x, renderer->scale.y);
        if (retval < 0) {
            goto end;
        } else {
            FlushRenderCommandsIfNotBatching(renderer);
        }
    }

end:
    /* Restore */
    SDL_SetRenderDrawBlendMode(renderer, blendMode);
    SDL_SetRenderDrawColor(renderer, r, g, b, a);

    return retval;
}

int
SDL_RenderGeometryRaw(SDL_Renderer *renderer,
                                  SDL_Texture *texture,
                                  const float *xy, int xy_stride,
                                  const int *color, int color_stride,
                                  const float *uv, int uv_stride,
                                  int num_vertices,
                                  const void *indices, int num_indices, int size_indices)
{
    int i;
    int retval = 0;
    int count = indices ? num_indices : num_vertices;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!renderer->QueueGeometry) {
        return SDL_Unsupported();
    }

    if (texture) {
        CHECK_TEXTURE_MAGIC(texture, -1);

        if (renderer != texture->renderer) {
            return SDL_SetError("Texture was not created with this renderer");
        }
    }

    if (!xy) {
        return SDL_InvalidParamError("xy");
    }

    if (!color) {
        return SDL_InvalidParamError("color");
    }

    if (texture && !uv) {
        return SDL_InvalidParamError("uv");
    }

    if (count % 3 != 0) {
        return SDL_InvalidParamError(indices ? "num_indices" : "num_vertices");
    }

    if (indices) {
        if (size_indices != 1 && size_indices != 2 && size_indices != 4) {
            return SDL_InvalidParamError("size_indices");
        }
    } else {
        size_indices = 0;
    }

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't draw while we're hidden */
    if (renderer->hidden) {
        return 0;
    }
#endif

    if (num_vertices < 3) {
        return 0;
    }

    if (texture && texture->native) {
        texture = texture->native;
    }

    if (texture) {
        for (i = 0; i < num_vertices; ++i) {
            const float *uv_ = (const float *)((const char*)uv + i * uv_stride);
            float u = uv_[0];
            float v = uv_[1];
            if (u < 0.0f || v < 0.0f || u > 1.0f || v > 1.0f) {
                return SDL_SetError("Values of 'uv' out of bounds %f %f at %d/%d", u, v, i, num_vertices);
            }
        }
    }

    if (indices) {
        for (i = 0; i < num_indices; ++i) {
            int j;
            if (size_indices == 4) {
                j = ((const Uint32 *)indices)[i];
            } else if (size_indices == 2) {
                j = ((const Uint16 *)indices)[i];
            } else {
                j = ((const Uint8 *)indices)[i];
            }
            if (j < 0 || j >= num_vertices) {
                return SDL_SetError("Values of 'indices' out of bounds");
            }
        }
    }

    if (texture) {
        texture->last_command_generation = renderer->render_command_generation;
    }

    /* For the software renderer, try to reinterpret triangles as SDL_Rect */
    if (renderer->info.flags & SDL_RENDERER_SOFTWARE) {
        return SDL_SW_RenderGeometryRaw(renderer, texture,
                xy, xy_stride, color, color_stride, uv, uv_stride, num_vertices,
                indices, num_indices, size_indices);
    }

    retval = QueueCmdGeometry(renderer, texture,
            xy, xy_stride, color, color_stride, uv, uv_stride,
            num_vertices,
            indices, num_indices, size_indices,
            renderer->scale.x, renderer->scale.y);

    return retval < 0 ? retval : FlushRenderCommandsIfNotBatching(renderer);
}


int
SDL_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
                     Uint32 format, void * pixels, int pitch)
{
    SDL_Rect real_rect;

    CHECK_RENDERER_MAGIC(renderer, -1);

    if (!renderer->RenderReadPixels) {
        return SDL_Unsupported();
    }

    FlushRenderCommands(renderer);  /* we need to render before we read the results. */

    if (!format) {
        format = SDL_GetWindowPixelFormat(renderer->window);
    }

    real_rect.x = renderer->viewport.x;
    real_rect.y = renderer->viewport.y;
    real_rect.w = renderer->viewport.w;
    real_rect.h = renderer->viewport.h;
    if (rect) {
        if (!SDL_IntersectRect(rect, &real_rect, &real_rect)) {
            return 0;
        }
        if (real_rect.y > rect->y) {
            pixels = (Uint8 *)pixels + pitch * (real_rect.y - rect->y);
        }
        if (real_rect.x > rect->x) {
            int bpp = SDL_BYTESPERPIXEL(format);
            pixels = (Uint8 *)pixels + bpp * (real_rect.x - rect->x);
        }
    }

    return renderer->RenderReadPixels(renderer, &real_rect,
                                      format, pixels, pitch);
}

void
SDL_RenderPresent(SDL_Renderer * renderer)
{
    CHECK_RENDERER_MAGIC(renderer, );

    FlushRenderCommands(renderer);  /* time to send everything to the GPU! */

#if DONT_DRAW_WHILE_HIDDEN
    /* Don't present while we're hidden */
    if (renderer->hidden) {
        return;
    }
#endif

    renderer->RenderPresent(renderer);
}

void
SDL_DestroyTexture(SDL_Texture * texture)
{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, );

    renderer = texture->renderer;
    if (texture == renderer->target) {
        SDL_SetRenderTarget(renderer, NULL);  /* implies command queue flush */
    } else {
        FlushRenderCommandsIfTextureNeeded(texture);
    }

    texture->magic = NULL;

    if (texture->next) {
        texture->next->prev = texture->prev;
    }
    if (texture->prev) {
        texture->prev->next = texture->next;
    } else {
        renderer->textures = texture->next;
    }

    if (texture->native) {
        SDL_DestroyTexture(texture->native);
    }
#if SDL_HAVE_YUV
    if (texture->yuv) {
        SDL_SW_DestroyYUVTexture(texture->yuv);
    }
#endif
    SDL_free(texture->pixels);

    renderer->DestroyTexture(renderer, texture);

    SDL_FreeSurface(texture->locked_surface);
    texture->locked_surface = NULL;

    SDL_free(texture);
}

void
SDL_DestroyRenderer(SDL_Renderer * renderer)
{
    SDL_RenderCommand *cmd;

    CHECK_RENDERER_MAGIC(renderer, );

    SDL_DelEventWatch(SDL_RendererEventWatch, renderer);

    if (renderer->render_commands_tail != NULL) {
        renderer->render_commands_tail->next = renderer->render_commands_pool;
        cmd = renderer->render_commands;
    } else {
        cmd = renderer->render_commands_pool;
    }

    renderer->render_commands_pool = NULL;
    renderer->render_commands_tail = NULL;
    renderer->render_commands = NULL;

    while (cmd != NULL) {
        SDL_RenderCommand *next = cmd->next;
        SDL_free(cmd);
        cmd = next;
    }

    SDL_free(renderer->vertex_data);

    /* Free existing textures for this renderer */
    while (renderer->textures) {
        SDL_Texture *tex = renderer->textures; (void) tex;
        SDL_DestroyTexture(renderer->textures);
        SDL_assert(tex != renderer->textures);  /* satisfy static analysis. */
    }

    if (renderer->window) {
        SDL_SetWindowData(renderer->window, SDL_WINDOWRENDERDATA, NULL);
    }

    /* It's no longer magical... */
    renderer->magic = NULL;

    /* Free the target mutex */
    SDL_DestroyMutex(renderer->target_mutex);
    renderer->target_mutex = NULL;

    /* Free the renderer instance */
    renderer->DestroyRenderer(renderer);
}

int SDL_GL_BindTexture(SDL_Texture *texture, float *texw, float *texh)
{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, -1);
    renderer = texture->renderer;
    if (texture->native) {
        return SDL_GL_BindTexture(texture->native, texw, texh);
    } else if (renderer && renderer->GL_BindTexture) {
        FlushRenderCommandsIfTextureNeeded(texture);  /* in case the app is going to mess with it. */
        return renderer->GL_BindTexture(renderer, texture, texw, texh);
    } else {
        return SDL_Unsupported();
    }
}

int SDL_GL_UnbindTexture(SDL_Texture *texture)
{
    SDL_Renderer *renderer;

    CHECK_TEXTURE_MAGIC(texture, -1);
    renderer = texture->renderer;
    if (texture->native) {
        return SDL_GL_UnbindTexture(texture->native);
    } else if (renderer && renderer->GL_UnbindTexture) {
        FlushRenderCommandsIfTextureNeeded(texture);  /* in case the app messed with it. */
        return renderer->GL_UnbindTexture(renderer, texture);
    }

    return SDL_Unsupported();
}

void *
SDL_RenderGetMetalLayer(SDL_Renderer * renderer)
{
    CHECK_RENDERER_MAGIC(renderer, NULL);

    if (renderer->GetMetalLayer) {
        FlushRenderCommands(renderer);  /* in case the app is going to mess with it. */
        return renderer->GetMetalLayer(renderer);
    }
    return NULL;
}

void *
SDL_RenderGetMetalCommandEncoder(SDL_Renderer * renderer)
{
    CHECK_RENDERER_MAGIC(renderer, NULL);

    if (renderer->GetMetalCommandEncoder) {
        FlushRenderCommands(renderer);  /* in case the app is going to mess with it. */
        return renderer->GetMetalCommandEncoder(renderer);
    }
    return NULL;
}

static SDL_BlendMode
SDL_GetShortBlendMode(SDL_BlendMode blendMode)
{
    if (blendMode == SDL_BLENDMODE_NONE_FULL) {
        return SDL_BLENDMODE_NONE;
    }
    if (blendMode == SDL_BLENDMODE_BLEND_FULL) {
        return SDL_BLENDMODE_BLEND;
    }
    if (blendMode == SDL_BLENDMODE_ADD_FULL) {
        return SDL_BLENDMODE_ADD;
    }
    if (blendMode == SDL_BLENDMODE_MOD_FULL) {
        return SDL_BLENDMODE_MOD;
    }
    if (blendMode == SDL_BLENDMODE_MUL_FULL) {
        return SDL_BLENDMODE_MUL;
    }
    return blendMode;
}

static SDL_BlendMode
SDL_GetLongBlendMode(SDL_BlendMode blendMode)
{
    if (blendMode == SDL_BLENDMODE_NONE) {
        return SDL_BLENDMODE_NONE_FULL;
    }
    if (blendMode == SDL_BLENDMODE_BLEND) {
        return SDL_BLENDMODE_BLEND_FULL;
    }
    if (blendMode == SDL_BLENDMODE_ADD) {
        return SDL_BLENDMODE_ADD_FULL;
    }
    if (blendMode == SDL_BLENDMODE_MOD) {
        return SDL_BLENDMODE_MOD_FULL;
    }
    if (blendMode == SDL_BLENDMODE_MUL) {
        return SDL_BLENDMODE_MUL_FULL;
    }
    return blendMode;
}

SDL_BlendMode
SDL_ComposeCustomBlendMode(SDL_BlendFactor srcColorFactor, SDL_BlendFactor dstColorFactor,
                           SDL_BlendOperation colorOperation,
                           SDL_BlendFactor srcAlphaFactor, SDL_BlendFactor dstAlphaFactor,
                           SDL_BlendOperation alphaOperation)
{
    SDL_BlendMode blendMode = SDL_COMPOSE_BLENDMODE(srcColorFactor, dstColorFactor, colorOperation,
                                                    srcAlphaFactor, dstAlphaFactor, alphaOperation);
    return SDL_GetShortBlendMode(blendMode);
}

SDL_BlendFactor
SDL_GetBlendModeSrcColorFactor(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 4) & 0xF);
}

SDL_BlendFactor
SDL_GetBlendModeDstColorFactor(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 8) & 0xF);
}

SDL_BlendOperation
SDL_GetBlendModeColorOperation(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendOperation)(((Uint32)blendMode >> 0) & 0xF);
}

SDL_BlendFactor
SDL_GetBlendModeSrcAlphaFactor(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 20) & 0xF);
}

SDL_BlendFactor
SDL_GetBlendModeDstAlphaFactor(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendFactor)(((Uint32)blendMode >> 24) & 0xF);
}

SDL_BlendOperation
SDL_GetBlendModeAlphaOperation(SDL_BlendMode blendMode)
{
    blendMode = SDL_GetLongBlendMode(blendMode);
    return (SDL_BlendOperation)(((Uint32)blendMode >> 16) & 0xF);
}

int
SDL_RenderSetVSync(SDL_Renderer * renderer, int vsync)
{
    CHECK_RENDERER_MAGIC(renderer, -1);

    if (vsync != 0 && vsync != 1) {
        return SDL_Unsupported();
    }

    if (renderer->SetVSync) {
        return renderer->SetVSync(renderer, vsync);
    }
    return SDL_Unsupported();
}

/* vi: set ts=4 sw=4 expandtab: */