Fixed bug 3347 - OpenGL ES renderer doesn't flip projection matrix for target textures

Simon Hug

When updating the viewport in GLES_UpdateViewport, the OpenGL ES renderer doesn't flip the projection matrix for target textures. The lines, rectangles and textures (if drawn with glDrawArrays) are upside down when drawing to target textures.

src/render/opengles/SDL_render_gles.c

@@ -676,13 +676,22 @@ GLES_UpdateViewport(SDL_Renderer * renderer)
                          renderer->viewport.w, renderer->viewport.h);
     }
 
+    data->glMatrixMode(GL_PROJECTION);
+    data->glLoadIdentity();
     if (renderer->viewport.w && renderer->viewport.h) {
-        data->glMatrixMode(GL_PROJECTION);
-        data->glLoadIdentity();
-        data->glOrthof((GLfloat) 0,
-                 (GLfloat) renderer->viewport.w,
-                 (GLfloat) renderer->viewport.h,
-                 (GLfloat) 0, 0.0, 1.0);
+        if (renderer->target) {
+            data->glOrthof((GLfloat) 0,
+                           (GLfloat) renderer->viewport.w,
+                           (GLfloat) 0,
+                           (GLfloat) renderer->viewport.h,
+                           0.0, 1.0);
+        } else {
+            data->glOrthof((GLfloat) 0,
+                           (GLfloat) renderer->viewport.w,
+                           (GLfloat) renderer->viewport.h,
+                           (GLfloat) 0,
+                           0.0, 1.0);
+        }
     }
     return 0;
 }