Started on the engine proper

core/engine.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "common.h"
+#include "engine_node.h"
+
+#include <SDL2/SDL.h>
+
+#include <sys/time.h>
+
+//the base engine object, which represents the state of the game
+typedef struct _engine {
+	//engine stuff
+	EngineNode* root;
+	struct timeval simTime;
+	struct timeval realTime;
+	bool running;
+
+	//SDL stuff
+	SDL_Window* window;
+	SDL_Renderer* renderer;
+	int screenWidth;
+	int screenHeight;
+} Engine;
+
+//APIs for initializing the engine
+CORE_API void initEngine(Engine* engine);
+CORE_API void freeEngine(Engine* engine);
+
+CORE_API void execEngine(Engine* engine);
+