SDL_GetRenderOutputSize - Get the output size in pixels of a rendering context.

       This function is available since SDL 3.2.0.

       This  returns  the  true  output  size  in  pixels,  ignoring  any  render  targets  or  logical size and
       presentation.

       For the output size of the current rendering target, with logical size adjustments, use

       SDL_GetCurrentRenderOutputSize () instead.

renderer
              the rendering context.

       w      a pointer filled in with the width in pixels.

       h      a pointer filled in with the height in pixels.

       Defined in SDL3/SDL_render.h

       SDL_GetRenderOutputSize - Get the output size in pixels of a rendering context.

       Returns true on success or false on failure; call

       SDL_GetError () for more information.

•(3), SDL_GetCurrentRenderOutputSize(3)

Simple Directmedia Layer                           SDL 3.2.10                         SDL_GetRenderOutputSize(3)

#include"SDL3/SDL.h"boolSDL_GetRenderOutputSize(SDL_Renderer*renderer,int*w,int*h);

       This function should only be called on the main thread.