Fix main loop, add example and cleanup

include/window/window.h

@@ -4,6 +4,11 @@
 #include "pch.h"
 #include "utils.h"
 
+struct Image {
+  SDL_Texture *texture;
+  Vec2<float> size;
+};
+
 struct Font {
   TTF_Font *font;
   bool pixel_art;
@@ -59,11 +64,12 @@ public:
   // title can be free'd by the caller after the window is created, as it's copied internally.
   Window(Vec2<float> size, const char *title);
 
+  void update(Vec2<float> new_size, const char *new_title);
+
   ~Window();
 
   // Rendering functions
-
-  int load_image(const char *path, bool pixel_art = false);
+  int load_image(const char *path, float alpha = 1.0f, bool pixel_art = false);
   void unload_image(int image_id);
   Vec2<float> get_image_size(int image_id);
 
@@ -77,7 +83,7 @@ public:
 
   bool write(int text_id, Vec2<float> position, float z, float angle = 0.0f, Vec2<float> scale = {1.0f, 1.0f});
 
-  bool draw(int image_id, Vec2<float> position, float z, float angle = 0.0f, Vec2<float> scale = {1.0f, 1.0f}, float alpha = 1.0f);
+  bool draw(int image_id, Vec2<float> position, float z, float angle = 0.0f, Vec2<float> scale = {1.0f, 1.0f});
 
   bool draw_rect(Rect rect, Color color, float z, float angle = 0.0f);
 
@@ -123,10 +129,10 @@ private:
   SDL_Texture *white_tex;
 
   // Image pool
-  Pool<SDL_Texture *> image_pool;
+  Pool<Image> image_pool;
 
   // Font pool
-  Pool<struct Font> font_pool;
+  Pool<Font> font_pool;
 
   // Text pool
   Pool<SDL_Texture *> text_pool;
@@ -146,7 +152,6 @@ private:
       struct {
         int image_id;
         Vec2<float> position;
-        float alpha;
       } draw_image;
 
       struct {
@@ -172,4 +177,6 @@ private:
   void draw_letterbox();
 };
 
+inline Window window({720, 480}, "Mysth Engine");
+
 #endif