add snake example game

src/main.c

@@ -1,10 +1,9 @@
 #include "engine.h"
 
-bool left = true;
-
 // polling events every frame
 void
-client_poll_event() {
+client_poll_event()
+{
 	SDL_Event ev = game_state->event;
 
 	if (ev.type == SDL_EVENT_QUIT) {
@@ -15,43 +14,28 @@ client_poll_event() {
 		switch (ev.key.key) {
 		case SDLK_Q:
 			game_state->is_running = false;
+			break;
+		default:
+			break;
 		}
 	} 
 }
 
-// performed every frame
+/**
+ * performed every frame
+ * runs on a separate worker thread - you can take advantage
+ * of sleep or usleep from <unistd.h> to create delays
+ */
 void
-client_update_framebuffer() {
-	// draw a green square
-	// clear_framebuffer(0x000000);
-	// for (int i = 0; i < 20; i++) {
-	// 	for (int j = 0; j < 20; j++) {
-	// 		put_pixel(i, j, 0x00FF00);
-	// 	}
-	// }
-
-	// draw alternating green squares
-	if (left) {
-		clear_framebuffer(0x000000);
-		for (int i = 0; i < 20; i++) {
-			for (int j = 0; j < 20; j++) {
-				put_pixel(i, j, 0x00FF00);
-			}
-		}
-		left = false;
-	} else {
-		clear_framebuffer(0x000000);
-		for (int i = 20; i < 40; i++) {
-			for (int j = 20; j < 40; j++) {
-				put_pixel(i, j, 0x00FFFF);
-			}
-		}
-		left = true;
-	}
-	SDL_Delay(100);
+client_update_framebuffer()
+{
+	// single green demo pixel
+	game_state->framebuffer[0] = 0x00FF00;
 }
 
-int main() {
+int 
+main()
+{
 	// initialize the engine
 	if (engine_init(
 		client_poll_event,