Added optimized YUV texture upload path with SDL_UpdateYUVTexture()

include/SDL_render.h

@@ -381,6 +381,31 @@ extern DECLSPEC int SDLCALL SDL_UpdateTexture(SDL_Texture * texture,
                                               const SDL_Rect * rect,
                                               const void *pixels, int pitch);
 
+/**
+ *  \brief Update a rectangle within a planar YV12 or IYUV texture with new pixel data.
+ *
+ *  \param texture   The texture to update
+ *  \param rect      A pointer to the rectangle of pixels to update, or NULL to
+ *                   update the entire texture.
+ *  \param Yplane    The raw pixel data for the Y plane.
+ *  \param Ypitch    The number of bytes between rows of pixel data for the Y plane.
+ *  \param Uplane    The raw pixel data for the U plane.
+ *  \param Upitch    The number of bytes between rows of pixel data for the U plane.
+ *  \param Vplane    The raw pixel data for the V plane.
+ *  \param Vpitch    The number of bytes between rows of pixel data for the V plane.
+ *
+ *  \return 0 on success, or -1 if the texture is not valid.
+ *
+ *  \note You can use SDL_UpdateTexture() as long as your pixel data is
+ *        a contiguous block of Y and U/V planes in the proper order, but
+ *        this function is available if your pixel data is not contiguous.
+ */
+extern DECLSPEC int SDLCALL SDL_UpdateYUVTexture(SDL_Texture * texture,
+                                                 const SDL_Rect * rect,
+                                                 const Uint8 *Yplane, int Ypitch,
+                                                 const Uint8 *Uplane, int Upitch,
+                                                 const Uint8 *Vplane, int Vpitch);
+
 /**
  *  \brief Lock a portion of the texture for write-only pixel access.
  *

src/render/SDL_render.c

@@ -804,6 +804,106 @@ SDL_UpdateTexture(SDL_Texture * texture, const SDL_Rect * rect,
     }
 }
 
+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 (texture->access == SDL_TEXTUREACCESS_STREAMING) {
+        /* We can lock the texture and copy to it */
+        void *native_pixels;
+        int native_pitch;
+
+        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 */
+        void *temp_pixels;
+        int temp_pitch;
+
+        temp_pitch = (((rect->w * SDL_BYTESPERPIXEL(native->format)) + 3) & ~3);
+        temp_pixels = SDL_malloc(rect->h * temp_pitch);
+        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;
+}
+
+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)
+{
+    SDL_Renderer *renderer;
+    SDL_Rect full_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");
+    }
+
+    if (!rect) {
+        full_rect.x = 0;
+        full_rect.y = 0;
+        full_rect.w = texture->w;
+        full_rect.h = texture->h;
+        rect = &full_rect;
+    }
+
+    if (texture->yuv) {
+        return SDL_UpdateTextureYUVPlanar(texture, rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch);
+    } else {
+        SDL_assert(!texture->native);
+        renderer = texture->renderer;
+        SDL_assert(renderer->UpdateTextureYUV);
+        return renderer->UpdateTextureYUV(renderer, texture, rect, Yplane, Ypitch, Uplane, Upitch, Vplane, Vpitch);
+    }
+}
+
 static int
 SDL_LockTextureYUV(SDL_Texture * texture, const SDL_Rect * rect,
                    void **pixels, int *pitch)

src/render/SDL_sysrender.h

@@ -89,6 +89,11 @@ struct SDL_Renderer
     int (*UpdateTexture) (SDL_Renderer * renderer, SDL_Texture * texture,
                           const SDL_Rect * rect, const void *pixels,
                           int pitch);
+    int (*UpdateTextureYUV) (SDL_Renderer * renderer, SDL_Texture * texture,
+                            const SDL_Rect * rect,
+                            const Uint8 *Yplane, int Ypitch,
+                            const Uint8 *Uplane, int Upitch,
+                            const Uint8 *Vplane, int Vpitch);
     int (*LockTexture) (SDL_Renderer * renderer, SDL_Texture * texture,
                         const SDL_Rect * rect, void **pixels, int *pitch);
     void (*UnlockTexture) (SDL_Renderer * renderer, SDL_Texture * texture);

src/render/SDL_yuv_sw.c

@@ -1184,6 +1184,60 @@ SDL_SW_UpdateYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
     return 0;
 }
 
+int
+SDL_SW_UpdateYUVTexturePlanar(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
+                              const Uint8 *Yplane, int Ypitch,
+                              const Uint8 *Uplane, int Upitch,
+                              const Uint8 *Vplane, int Vpitch)
+{
+    Uint8 *src, *dst;
+    int row;
+    size_t length;
+
+    /* Copy the Y plane */
+    src = Yplane;
+    dst = swdata->pixels + rect->y * swdata->w + rect->x;
+    length = rect->w;
+    for (row = 0; row < rect->h; ++row) {
+        SDL_memcpy(dst, src, length);
+        src += Ypitch;
+        dst += swdata->w;
+    }
+
+    /* Copy the U plane */
+    src = Uplane;
+    if (swdata->format == SDL_PIXELFORMAT_IYUV) {
+        dst = swdata->pixels + swdata->h * swdata->w;
+    } else {
+        dst = swdata->pixels + swdata->h * swdata->w +
+              (swdata->h * swdata->w) / 4;
+    }
+    dst += rect->y/2 * swdata->w/2 + rect->x/2;
+    length = rect->w / 2;
+    for (row = 0; row < rect->h/2; ++row) {
+        SDL_memcpy(dst, src, length);
+        src += Upitch;
+        dst += swdata->w/2;
+    }
+
+    /* Copy the V plane */
+    src = Vplane;
+    if (swdata->format == SDL_PIXELFORMAT_YV12) {
+        dst = swdata->pixels + swdata->h * swdata->w;
+    } else {
+        dst = swdata->pixels + swdata->h * swdata->w +
+              (swdata->h * swdata->w) / 4;
+    }
+    dst += rect->y/2 * swdata->w/2 + rect->x/2;
+    length = rect->w / 2;
+    for (row = 0; row < rect->h/2; ++row) {
+        SDL_memcpy(dst, src, length);
+        src += Vpitch;
+        dst += swdata->w/2;
+    }
+    return 0;
+}
+
 int
 SDL_SW_LockYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
                       void **pixels, int *pitch)

src/render/SDL_yuv_sw_c.h

@@ -57,6 +57,10 @@ int SDL_SW_QueryYUVTexturePixels(SDL_SW_YUVTexture * swdata, void **pixels,
                                  int *pitch);
 int SDL_SW_UpdateYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
                             const void *pixels, int pitch);
+int SDL_SW_UpdateYUVTexturePlanar(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
+                                  const Uint8 *Yplane, int Ypitch,
+                                  const Uint8 *Uplane, int Upitch,
+                                  const Uint8 *Vplane, int Vpitch);
 int SDL_SW_LockYUVTexture(SDL_SW_YUVTexture * swdata, const SDL_Rect * rect,
                           void **pixels, int *pitch);
 void SDL_SW_UnlockYUVTexture(SDL_SW_YUVTexture * swdata);

src/render/opengl/SDL_render_gl.c

@@ -52,6 +52,11 @@ static int GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
 static int GL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
                             const SDL_Rect * rect, const void *pixels,
                             int pitch);
+static int GL_UpdateTextureYUV(SDL_Renderer * renderer, SDL_Texture * texture,
+                               const SDL_Rect * rect,
+                               const Uint8 *Yplane, int Ypitch,
+                               const Uint8 *Uplane, int Upitch,
+                               const Uint8 *Vplane, int Vpitch);
 static int GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
                           const SDL_Rect * rect, void **pixels, int *pitch);
 static void GL_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);
@@ -403,6 +408,7 @@ GL_CreateRenderer(SDL_Window * window, Uint32 flags)
     renderer->GetOutputSize = GL_GetOutputSize;
     renderer->CreateTexture = GL_CreateTexture;
     renderer->UpdateTexture = GL_UpdateTexture;
+    renderer->UpdateTextureYUV = GL_UpdateTextureYUV;
     renderer->LockTexture = GL_LockTexture;
     renderer->UnlockTexture = GL_UnlockTexture;
     renderer->SetRenderTarget = GL_SetRenderTarget;
@@ -801,6 +807,41 @@ GL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
     return GL_CheckError("glTexSubImage2D()", renderer);
 }
 
+static int
+GL_UpdateTextureYUV(SDL_Renderer * renderer, SDL_Texture * texture,
+                    const SDL_Rect * rect,
+                    const Uint8 *Yplane, int Ypitch,
+                    const Uint8 *Uplane, int Upitch,
+                    const Uint8 *Vplane, int Vpitch)
+{
+    GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;
+    GL_TextureData *data = (GL_TextureData *) texture->driverdata;
+
+    GL_ActivateRenderer(renderer);
+
+    renderdata->glEnable(data->type);
+    renderdata->glBindTexture(data->type, data->texture);
+    renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+    renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH, Ypitch);
+    renderdata->glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,
+                                rect->h, data->format, data->formattype,
+                                Yplane);
+
+    renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH, Upitch);
+    renderdata->glBindTexture(data->type, data->utexture);
+    renderdata->glTexSubImage2D(data->type, 0, rect->x/2, rect->y/2,
+                                rect->w/2, rect->h/2,
+                                data->format, data->formattype, Uplane);
+
+    renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH, Vpitch);
+    renderdata->glBindTexture(data->type, data->vtexture);
+    renderdata->glTexSubImage2D(data->type, 0, rect->x/2, rect->y/2,
+                                rect->w/2, rect->h/2,
+                                data->format, data->formattype, Vplane);
+    renderdata->glDisable(data->type);
+    return GL_CheckError("glTexSubImage2D()", renderer);
+}
+
 static int
 GL_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
                const SDL_Rect * rect, void **pixels, int *pitch)