(This is the documentation for SDL3, which is the current stable version. SDL2 was the previous version!)

SDL_GL_SwapWindow

Update a window with OpenGL rendering.

Header File

Defined in <SDL3/SDL_video.h>

Syntax

bool SDL_GL_SwapWindow(SDL_Window *window);

Function Parameters

SDL_Window *

window

the window to change.

Return Value

(bool) Returns true on success or false on failure; call SDL_GetError() for more information.

Remarks

This is used with double-buffered OpenGL contexts, which are the default.

On macOS, make sure you bind 0 to the draw framebuffer before swapping the window, otherwise nothing will happen. If you aren't using glBindFramebuffer(), this is the default and you won't have to do anything extra.

Thread Safety

This function should only be called on the main thread.

Version

This function is available since SDL 3.1.3.

Code Examples

SDL_Window* window = SDL_CreateWindow("SDL3/OpenGL Demo", 640, 480, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
      
/* Create an OpenGL context associated with the window. */
SDL_GLContext glcontext = SDL_GL_CreateContext(window);

/* This makes our buffer swap syncronized with the monitor's vertical refresh */
SDL_GL_SetSwapInterval(1);

/* Clear context */
glClearColor(0,0,0,1);
glClear(GL_COLOR_BUFFER_BIT);

/* <Extra drawing functions here> */ 

/* Swap our buffer to display the current contents of buffer on screen */ 
SDL_GL_SwapWindow(window);

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CategoryAPI, CategoryAPIFunction, CategoryVideo

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