SDL_GPUTransferBufferUsage.3type - Man Page

#include <SDL3/SDL_gpu.h>

typedef enum SDL_GPUTransferBufferUsage
{
    SDL_GPU_TRANSFERBUFFERUSAGE_UPLOAD,
    SDL_GPU_TRANSFERBUFFERUSAGE_DOWNLOAD
} SDL_GPUTransferBufferUsage;

Note that mapping and copying FROM an upload transfer buffer or TO a download transfer buffer is undefined behavior.

This enum is available since SDL 3.2.0.

SDL_CreateGPUTransferBuffer(3)