SDL_GPUViewport.3type - Man Page

#include <SDL3/SDL_gpu.h>

typedef struct SDL_GPUViewport
{
    float x;          /**< The left offset of the viewport. */
    float y;          /**< The top offset of the viewport. */
    float w;          /**< The width of the viewport. */
    float h;          /**< The height of the viewport. */
    float min_depth;  /**< The minimum depth of the viewport. */
    float max_depth;  /**< The maximum depth of the viewport. */
} SDL_GPUViewport;

This struct is available since SDL 3.2.0.

SDL_SetGPUViewport(3)