#include <iostream>
#include <SDL2/SDL.h>
#define GL3_PROTOTYPES 1
#include <GL3/gl3.h>

int main(int argc, char **argv) {
    SDL_Window *window(0);
    SDL_GLContext glcontext;

    SDL_Init(SDL_INIT_VIDEO);

    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 1);

    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);

    window = SDL_CreateWindow("OpenGL", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 360, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
    glcontext = SDL_GL_CreateContext(window);


    float vertices[] = {-0.5, -0.5,   0.0, 0.5,   0.5, -0.5};

    glClear(GL_COLOR_BUFFER_BIT);

    glEnableVertexAttribArray(0);
    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, vertices);

    glDrawArrays(GL_TRIANGLES, 0, 3);
    glDisableVertexAttribArray(0);

    SDL_GL_SwapWindow(window);


    SDL_Event events;
    bool close(false);
    while(!close) {
        SDL_WaitEvent(&events);
        if((events.type == SDL_KEYDOWN && events.key.keysym.sym == SDLK_ESCAPE) || events.type == SDL_QUIT)
            close = true;
    }

    SDL_GL_DeleteContext(glcontext);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}