sdl example for missingno

thing.cpp

#include <GLXW/glxw.h>
#include <SDL2/SDL.h>

class DisplaySystem {
public:
	DisplaySystem() {
		window = SDL_CreateWindow(
			"thingy",
			SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
			1280, 720,
			SDL_WINDOW_OPENGL //| SDL_WINDOW_FULLSCREEN_DESKTOP
		);
		renderer = SDL_CreateRenderer(window, -1,
			SDL_RENDERER_ACCELERATED |
			SDL_RENDERER_PRESENTVSYNC
		);
		SDL_GL_SetSwapInterval(1);

		if (!window || !renderer || glxwInit()) {
			init_succeeded = false;
			return;
		}

		glEnable(GL_DEPTH_TEST);
		glEnable(GL_BLEND);
		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

		//glDebugMessageCallbackARB(&gl_debug_callback, NULL);

		init_succeeded = true;
	}

	void shutdown() {
		SDL_DestroyRenderer(renderer);
		SDL_DestroyWindow(window);
	}

	void flip() {
		SDL_RenderPresent(renderer);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	}

	const bool did_init() { return init_succeeded; }

protected:
	bool init_succeeded;
	SDL_Renderer *renderer;
	SDL_Window *window;
	GLuint vao, vbo, vs, fs, shader;
};

int main(int argc, char **argv) {
	SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);

	DisplaySystem display;

	if (!display.did_init()) {
		printf("%s :(\n", SDL_GetError());
		return 1;
	}

	double then = SDL_GetTicks();
	double last_reset = then;
	while (1) {
		SDL_Event e;
		if (SDL_PollEvent(&e)) {
			if (e.type == SDL_QUIT)
				break;
			if (e.type == SDL_KEYDOWN) {
				if (e.key.keysym.sym == SDLK_ESCAPE)
					break;
			}
		}

		double now = SDL_GetTicks();
		double delta = (now - then) / 1000.0;
		then = now;

		// update/draw things

		display.flip();
	}

	display.shutdown();

	SDL_Quit();

	return 0;
}