initial commit with demo in main.c

src/main.c

@@ -0,0 +1,66 @@
+#include "engine.h"
+
+bool left = true;
+
+// polling events every frame
+void
+client_poll_event() {
+	SDL_Event ev = game_state->event;
+
+	if (ev.type == SDL_EVENT_QUIT) {
+		game_state->is_running = false;
+	}
+
+	if (ev.type == SDL_EVENT_KEY_DOWN) {
+		switch (ev.key.key) {
+		case SDLK_Q:
+			game_state->is_running = false;
+		}
+	} 
+}
+
+// performed every frame
+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);
+}
+
+int main() {
+	// initialize the engine
+	if (engine_init(
+		client_poll_event,
+		client_update_framebuffer
+	)) {
+		engine_start();
+		engine_stop();
+		return 0;
+	} else {
+		return 1;
+	}
+}