Add game entity list rendering, create animations

src/include/Dengine/Common.h

@@ -22,5 +22,7 @@ typedef double f64;
 
 #define ARRAY_COUNT(array) (sizeof(array) / sizeof(array[0]))
 #define CAST(type) (type)
+#define ASSERT(expr) if(!(expr)) { *(int *)0 = 0; }
+
 
 #endif

src/include/Dengine/Entity.h

@@ -4,12 +4,34 @@
 #include <Dengine/Texture.h>
 #include <Dengine/Math.h>
 
+enum Direction
+{
+	direction_north,
+	direction_west,
+	direction_south,
+	direction_east,
+	direction_num,
+	direction_null,
+};
+
+typedef struct SpriteAnim
+{
+	v4 *rect;
+	i32 numRects;
+	i32 currRectIndex;
+
+	f32 duration;
+	f32 currDuration;
+} SpriteAnim;
+
 typedef struct Entity
 {
 	v2 pos;  // Position
 	v2 dPos; // Velocity
 	v2 size;
+	enum Direction direction;
 	Texture *tex;
+	SpriteAnim anim;
 } Entity;
 
 #endif

src/include/WorldTraveller/WorldTraveller.h

@@ -15,15 +15,6 @@ enum State
 	state_win
 };
 
-enum Direction
-{
-	direction_north,
-	direction_west,
-	direction_south,
-	direction_east,
-	direction_num,
-};
-
 typedef struct GameState
 {
 	enum State state;
@@ -31,8 +22,11 @@ typedef struct GameState
 	i32 width, height;
 
 	Renderer renderer;
-	Entity hero;
-	enum Direction heroLastDirection;
+	i32 heroIndex;
+
+	// TODO(doyle): Make size of list dynamic
+	Entity entityList[256];
+	i32 freeEntityIndex;
 } GameState;
 
 void worldTraveller_gameInit(GameState *state);