Got some input working again

gui/gui.c

@@ -345,6 +345,53 @@ void gui_apply_input(
 	(void)context;
 	(void)mouse_x;
 	(void)mouse_y;
+	// --- Mouse Input ---
+	// NOTE(Zelaven): First hit test against layers.
+	GUI_Layer *hit_layer = &context->background_layer;
+	GUI_Subtree *hit_root_subtree = (GUI_Subtree*)hit_layer->subtree_rdic.root;
+	{
+		GUI_Layer *top_layer = &context->top_layer;
+		GUI_Subtree *root_subtree = (GUI_Subtree*)top_layer->subtree_rdic.root;
+		if(root_subtree != NULL)
+		{
+			GUI_Node *top_layer_root =
+				(GUI_Node*)root_subtree->rdic.root;
+			if(top_layer_root != NULL)
+			if(point_in_rect(mouse_x, mouse_y, top_layer_root->rect))
+			{
+				hit_layer = &context->top_layer;
+				hit_root_subtree = root_subtree;
+			}
+		}
+	}
+	(void)hit_layer;
+
+	assert(hit_root_subtree != NULL);
+
+	GUI_Node *top_node_under_cursor = (GUI_Node*)hit_root_subtree->rdic.root;
+	GUI_Node *current_node = (GUI_Node*)top_node_under_cursor->rdic_node.first_child;
+	int mouse_over_node = 0;
+	while(current_node != NULL)
+	{
+		mouse_over_node = point_in_rect(mouse_x, mouse_y, current_node->rect);
+		if(mouse_over_node)
+		{
+			top_node_under_cursor = current_node;
+			current_node = (GUI_Node*)current_node->rdic_node.first_child;
+		}
+		else
+		{
+			current_node = (GUI_Node*)current_node->rdic_node.sibling;
+		}
+	}
+
+	context->top_node_under_cursor.node = top_node_under_cursor;
+	context->top_node_under_cursor.generation =
+		top_node_under_cursor->rdic_node.generation;
+	DEBUG("Top node under cursor: %.*s\n",
+		top_node_under_cursor->debug_string.length,
+		top_node_under_cursor->debug_string.cstring);
+
 	return;
 }
 #if 0