Partial tower implementation

game/main.c

@@ -88,10 +88,13 @@ bool bzMain(BzAppDesc *appDesc, int argc, const char **argv) {
     return true;
 }
 
-int cmpDrawData(const void *a, const void *b) {
+static int cmpDrawData(const void *a, const void *b) {
     const DrawData *lhs = (DrawData *) a;
     const DrawData *rhs = (DrawData *) b;
 
+    if (lhs->layer != rhs->layer)
+        return lhs->layer - rhs->layer;
+
     f32 dif = (rhs->dst.y) - (lhs->dst.y);
     int cmpVal = 0;
     if (dif < 0) cmpVal = 1;
@@ -499,11 +502,16 @@ static void renderGame(Game *game, float dt) {
             src.height -= 0.02f;
             if (t[i].flipX) src.width *= -1.0f;
             if (t[i].flipY) src.height *= -1.0f;
+            u8 drawLayer = 0;
+            if (ecs_has(ECS, it.entities[i], DrawLayer)) {
+                drawLayer = *ecs_get(ECS, it.entities[i], DrawLayer);
+            }
             DrawData draw = (DrawData) {
                 .src = src,
                 .dst = dst,
                 .origin = origin,
                 .rotation = r[i],
+                .layer = drawLayer,
                 .canHaveAlpha = true,
             };
             if (ecs_has_id(ECS, it.entities[i], ecs_id(Unit))) {