static int
GL_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels, int pitch)
{
GL_RenderData *renderdata = (GL_RenderData *) renderer->driverdata;
GL_TextureData *data = (GL_TextureData *) texture->driverdata;
GLenum result;
GL_ActivateRenderer(renderer);
renderdata->glGetError();
renderdata->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH,
(pitch / SDL_BYTESPERPIXEL(texture->format)));
renderdata->glEnable(data->type);
renderdata->glBindTexture(data->type, data->texture);
renderdata->glTexSubImage2D(data->type, 0, rect->x, rect->y, rect->w,
rect->h, data->format, data->formattype,
pixels);
if (data->yuv) {
const void *top;
renderdata->glPixelStorei(GL_UNPACK_ROW_LENGTH, (pitch / 2));
/* Skip to the top of the next texture */
top = (const void*)((const Uint8*)pixels + (texture->h-rect->y) * pitch - rect->x);
/* Skip to the correct offset into the next texture */
pixels = (const void*)((const Uint8*)top + (rect->y / 2) * pitch + rect->x / 2);
if (texture->format == SDL_PIXELFORMAT_YV12) {
renderdata->glBindTexture(data->type, data->vtexture);
} else {
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, pixels);
/* Skip to the top of the next texture */
top = (const void*)((const Uint8*)top + (texture->h * pitch)/4);
/* Skip to the correct offset into the next texture */
pixels = (const void*)((const Uint8*)top + (rect->y / 2) * pitch + rect->x / 2);
if (texture->format == SDL_PIXELFORMAT_YV12) {
renderdata->glBindTexture(data->type, data->utexture);
} else {
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, pixels);
}
renderdata->glDisable(data->type);
result = renderdata->glGetError();
if (result != GL_NO_ERROR) {
GL_SetError("glTexSubImage2D()", result);
return -1;
}
return 0;
}
