File main.cpp Tutorial C++ SDL2.0 OpenGL (CodeBlocks)

#include <SDL.h>
#include <GL/gl.h>
#include <GL/glu.h>

int main(int argc, char *argv[])
{
    SDL_Init(SDL_INIT_VIDEO);
    SDL_Window *screen = SDL_CreateWindow("Ma fenetre de jeu", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_OPENGL);
    SDL_GLContext glcontext = SDL_GL_CreateContext(screen);
    SDL_Event event;

    while (continuer)
    {
        SDL_WaitEvent(&event);
        switch(event.type)
        {
            case SDL_QUIT:
                continuer = false;
        }

        glClear(GL_COLOR_BUFFER_BIT);

        glBegin(GL_TRIANGLES);
            glColor3ub(255,0,0);    glVertex2d(-0.75,-0.75);
            glColor3ub(0,255,0);    glVertex2d(0,0.75);
            glColor3ub(0,0,255);    glVertex2d(0.75,-0.75);
        glEnd();

        glFlush();
        SDL_GL_SwapWindow(screen);
    }

    SDL_Quit();
    return 0;
}