SDL_GPUIndexElementSize.3type - Man Page

#include <SDL3/SDL_gpu.h>

typedef enum SDL_GPUIndexElementSize
{
    SDL_GPU_INDEXELEMENTSIZE_16BIT, /**< The index elements are 16-bit. */
    SDL_GPU_INDEXELEMENTSIZE_32BIT  /**< The index elements are 32-bit. */
} SDL_GPUIndexElementSize;

This enum is available since SDL 3.2.0.

SDL_CreateGPUGraphicsPipeline(3)