Minimal C SDL2 OpenGL example

sdl-opengl-example.c

//
// cc main.c glad.c -lSDL2
//
#include "glad.h" // https://glad.dav1d.de/
#include <SDL2/SDL.h>
#include <SDL2/SDL_opengl.h>
#include <stdbool.h>

int main()
{
    SDL_InitSubSystem(SDL_INIT_VIDEO);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);

    SDL_Window *window = SDL_CreateWindow("SDL OpenGL", -1, -1, 1280, 720, SDL_WINDOW_OPENGL);
    SDL_GLContext context = SDL_GL_CreateContext(window);
    SDL_GL_MakeCurrent(window, context);
    gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress);

    bool quit = false;
    SDL_Event e;

    while (!quit) {
        while (SDL_PollEvent(&e) != 0) {
            switch (e.type) {
                case SDL_QUIT: quit = true; break;
            }
        }

        glClearColor(0.3, 0.3, 0.3, 1.0);
        glClear(GL_COLOR_BUFFER_BIT);
        SDL_GL_SwapWindow(window);
    }

    SDL_GL_DeleteContext(context);
    SDL_DestroyWindow(window);
    SDL_Quit();
}