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+/*
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+ Simple DirectMedia Layer
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+ Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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+
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+ This software is provided 'as-is', without any express or implied
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+ warranty. In no event will the authors be held liable for any damages
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+ arising from the use of this software.
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+
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+ Permission is granted to anyone to use this software for any purpose,
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+ including commercial applications, and to alter it and redistribute it
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+ freely, subject to the following restrictions:
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+
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+ 1. The origin of this software must not be misrepresented; you must not
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+ claim that you wrote the original software. If you use this software
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+ in a product, an acknowledgment in the product documentation would be
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+ appreciated but is not required.
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+ 2. Altered source versions must be plainly marked as such, and must not be
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+ misrepresented as being the original software.
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+ 3. This notice may not be removed or altered from any source distribution.
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+*/
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+#include "../../SDL_internal.h"
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+
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+#ifdef SDL_JOYSTICK_HIDAPI
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+
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+/* Handle rumble on a separate thread so it doesn't block the application */
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+
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+#include "SDL_assert.h"
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+#include "SDL_thread.h"
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+#include "SDL_hidapijoystick_c.h"
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+#include "SDL_hidapi_rumble.h"
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+
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+
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+typedef struct SDL_HIDAPI_RumbleRequest
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+{
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+ SDL_HIDAPI_Device *device;
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+ Uint8 data[USB_PACKET_LENGTH];
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+ int size;
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+ struct SDL_HIDAPI_RumbleRequest *prev;
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+
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+} SDL_HIDAPI_RumbleRequest;
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+
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+typedef struct SDL_HIDAPI_RumbleContext
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+{
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+ volatile SDL_bool running;
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+ SDL_Thread *thread;
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+ SDL_mutex *lock;
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+ SDL_sem *request_sem;
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+ SDL_HIDAPI_RumbleRequest *requests_head;
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+ SDL_HIDAPI_RumbleRequest *requests_tail;
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+} SDL_HIDAPI_RumbleContext;
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+
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+static SDL_HIDAPI_RumbleContext rumble_context;
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+
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+static int SDL_HIDAPI_RumbleThread(void *data)
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+{
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+ SDL_HIDAPI_RumbleContext *ctx = (SDL_HIDAPI_RumbleContext *)data;
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+
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+ SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
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+
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+ while (ctx->running) {
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+ SDL_HIDAPI_RumbleRequest *request = NULL;
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+
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+ SDL_SemWait(ctx->request_sem);
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+
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+ SDL_LockMutex(ctx->lock);
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+ request = ctx->requests_tail;
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+ if (request) {
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+ if (request == ctx->requests_head) {
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+ ctx->requests_head = NULL;
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+ }
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+ ctx->requests_tail = request->prev;
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+ }
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+ SDL_UnlockMutex(ctx->lock);
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+
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+ if (request) {
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+ SDL_LockMutex(request->device->dev_lock);
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+ hid_write(request->device->dev, request->data, request->size);
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+ SDL_UnlockMutex(request->device->dev_lock);
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+ (void)SDL_AtomicDecRef(&request->device->rumble_pending);
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+ SDL_free(request);
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+ }
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+ }
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+ return 0;
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+}
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+
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+static void
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+SDL_HIDAPI_StopRumbleThread(SDL_HIDAPI_RumbleContext *ctx)
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+{
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+ ctx->running = SDL_FALSE;
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+
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+ if (ctx->thread) {
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+ int result;
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+
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+ SDL_SemPost(ctx->request_sem);
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+ SDL_WaitThread(ctx->thread, &result);
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+ ctx->thread = NULL;
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+ }
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+
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+ /* This should always be called with an empty queue */
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+ SDL_assert(!ctx->requests_head);
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+ SDL_assert(!ctx->requests_tail);
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+
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+ if (ctx->request_sem) {
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+ SDL_DestroySemaphore(ctx->request_sem);
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+ ctx->request_sem = NULL;
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+ }
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+
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+ if (ctx->lock) {
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+ SDL_DestroyMutex(ctx->lock);
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+ ctx->lock = NULL;
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+ }
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+}
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+
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+static int
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+SDL_HIDAPI_StartRumbleThread(SDL_HIDAPI_RumbleContext *ctx)
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+{
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+ ctx->lock = SDL_CreateMutex();
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+ if (!ctx->lock) {
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+ SDL_HIDAPI_StopRumbleThread(ctx);
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+ return -1;
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+ }
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+
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+ ctx->request_sem = SDL_CreateSemaphore(0);
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+ if (!ctx->request_sem) {
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+ SDL_HIDAPI_StopRumbleThread(ctx);
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+ return -1;
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+ }
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+
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+ ctx->running = SDL_TRUE;
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+ ctx->thread = SDL_CreateThread(SDL_HIDAPI_RumbleThread, "HIDAPI Rumble", ctx);
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+ if (!ctx->thread) {
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+ SDL_HIDAPI_StopRumbleThread(ctx);
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+ return -1;
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+ }
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+ return 0;
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+}
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+
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+int SDL_HIDAPI_SendRumble(SDL_HIDAPI_Device *device, const Uint8 *data, int size)
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+{
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+ SDL_HIDAPI_RumbleContext *ctx = &rumble_context;
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+ SDL_HIDAPI_RumbleRequest *request;
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+
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+ if (size > sizeof(request->data)) {
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+ return SDL_SetError("Couldn't send rumble, size %d is greater than %d", size, sizeof(request->data));
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+ }
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+
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+ if (!ctx->running) {
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+ if (SDL_HIDAPI_StartRumbleThread(ctx) < 0) {
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+ return -1;
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+ }
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+ }
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+
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+ request = (SDL_HIDAPI_RumbleRequest *)SDL_calloc(1, sizeof(*request));
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+ if (!request) {
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+ return SDL_OutOfMemory();
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+ }
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+ request->device = device;
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+ SDL_memcpy(request->data, data, size);
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+ request->size = size;
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+
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+ SDL_AtomicIncRef(&device->rumble_pending);
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+
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+ SDL_LockMutex(ctx->lock);
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+ if (ctx->requests_head) {
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+ ctx->requests_head->prev = request;
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+ } else {
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+ ctx->requests_tail = request;
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+ }
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+ ctx->requests_head = request;
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+ SDL_UnlockMutex(ctx->lock);
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+
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+ SDL_SemPost(ctx->request_sem);
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+
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+ return size;
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+}
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+
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+void SDL_HIDAPI_QuitRumble()
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+{
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+ SDL_HIDAPI_RumbleContext *ctx = &rumble_context;
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+
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+ if (ctx->running) {
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+ SDL_HIDAPI_StopRumbleThread(ctx);
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+ }
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+}
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+
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+#endif /* SDL_JOYSTICK_HIDAPI */
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+
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+/* vi: set ts=4 sw=4 expandtab: */
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Sam Lantinga