Use this function to create an OpenGL context for use with an OpenGL window, and make it current.
SDL_GLContext SDL_GL_CreateContext(SDL_Window* window)
the window to associate with the context
Returns the OpenGL context associated with window or NULL on error; call SDL_GetError() for more details.
// Window mode MUST include SDL_WINDOW_OPENGL for use with OpenGL. SDL_Window *window = SDL_CreateWindow( "SDL2/OpenGL Demo", 0, 0, 640, 480, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE); // Create an OpenGL context associated with the window. SDL_GLContext glcontext = SDL_GL_CreateContext(window); // now you can make GL calls. glClearColor(0,0,0,1); glClear(GL_COLOR_BUFFER_BIT); SDL_GL_SwapWindow(window); // Once finished with OpenGL functions, the SDL_GLContext can be deleted. SDL_GL_DeleteContext(glcontext);
Windows users new to OpenGL should note that, for historical reasons, GL functions added after OpenGL version 1.1 are not available by default. Those functions must be loaded at run-time, either with an OpenGL extension-handling library or with SDL_GL_GetProcAddress() and its related functions.
SDL_GLContext is an alias for void *.