get minimal example running

examples/main.cpp

@@ -1,4 +1,6 @@
 
+#include <SDL2/SDL.h>
+
 #include "renderer.h"
 
 
@@ -6,6 +8,27 @@ int
 main()
 {
 	render_state* rs = renInit();
+	const uint TARGET_FPS = 60;
+	const uint FRAME_DELAY = 1000 / TARGET_FPS;
+	uint frameStart, frameTime;
+	bool running = true;
+	SDL_Event e;
+
+	while (running) {
+		frameStart = SDL_GetTicks();
+
+		while (SDL_PollEvent(&e)) {
+			if (e.type == SDL_KEYDOWN && e.key.keysym.sym == SDLK_ESCAPE)
+				running = false;
+		}
+
+		renRenderFrame(rs, nullptr, 0);
+		SDL_GL_SwapWindow(rs->handles.window);
+		frameTime = SDL_GetTicks() - frameStart;
+
+		if (FRAME_DELAY > frameTime)
+			SDL_Delay(FRAME_DELAY - frameTime);
+	}
 
 	return 0;
 }