SDL.cpp

// The OpenGL libraries, make sure to include the GLUT and OpenGL frameworks
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#include <SDL2/SDL.h>

// This is just an example using basic glut functionality.
// If you want specific Apple functionality, look up AGL



int main(int argc, char **argv)
{
   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.
   int quit = 0;
   int color = 1;
   SDL_Event event;
   while(!quit){
    while(SDL_PollEvent(&event))
    {
        /* If a quit event has been sent */
        if (event.type == SDL_QUIT)
        {
            /* Quit the application */
            quit = 1;
        }
    }
    glClearColor(1,0,color,0);
    glClear(GL_COLOR_BUFFER_BIT);
    glBegin(GL_TRIANGLES);
        glVertex3f(0.0, 0.0, -10.0);
        glVertex3f(1.0, 0.0, -10.0);
        glVertex3f(0.0, 1.0, -10.0);
    glEnd();

    

    

    SDL_GL_SwapWindow(window);
    if(color == 1){
      color = 0;
    }
    else{
      color = 1;
    }
    SDL_Delay(500);
   }

   // Once finished with OpenGL functions, the SDL_GLContext can be deleted.
   SDL_GL_DeleteContext(glcontext);  
   return 0;

}