Copies data from a texture to a transfer buffer on the GPU timeline.
Defined in <SDL3/SDL_gpu.h>
void SDL_DownloadFromGPUTexture(
    SDL_GPUCopyPass *copy_pass,
    const SDL_GPUTextureRegion *source,
    const SDL_GPUTextureTransferInfo *destination);| SDL_GPUCopyPass * | copy_pass | a copy pass handle. | 
| const SDL_GPUTextureRegion * | source | the source texture region. | 
| const SDL_GPUTextureTransferInfo * | destination | the destination transfer buffer with image layout information. | 
This data is not guaranteed to be copied until the command buffer fence is signaled.
This function is available since SDL 3.2.0.