CIFilters直接在OpenGL纹理上

Question

How can I apply CIFilters directly on OpenGL texture? To avoid VRAM->RAM->VRAM (GPU->CPU->GPU) actions. I mean to avoid this type of pipeline:

Because they are slow. I need somehow to do as much as possible in GPU. But how?

Answer 1

Refer CGBitmapContextCreate()

CGContextRef CGBitmapContextCreate (
   void *data,
   size_t width,
   size_t height,
   size_t bitsPerComponent,
   size_t bytesPerRow,
   CGColorSpaceRef colorspace,
   CGBitmapInfo bitmapInfo
);

Notice that it takes void *data. This can be your image data which you can pass directly to OpenGL.