From 2d6bf0f6b904ed331b5cb7aaab8855077ae9ce28 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 2 Oct 2022 18:21:38 +0100
Subject: Add WorldOverlay concept

Allows rendering in the world view objects which are not (yet?) part of that world
---
 ui/window.cpp     | 2 ++
 ui/worldOverlay.h | 9 +++++++++
 2 files changed, 11 insertions(+)
 create mode 100644 ui/worldOverlay.h

diff --git a/ui/window.cpp b/ui/window.cpp
index 9ecc88c..3569915 100644
--- a/ui/window.cpp
+++ b/ui/window.cpp
@@ -1,5 +1,6 @@
 #include "window.h"
 #include "uiComponent.h"
+#include "worldOverlay.h"
 #include <GL/glew.h>
 #include <glm/glm.hpp>
 #include <stdexcept>
@@ -90,6 +91,7 @@ Window::refresh() const
 void
 Window::render() const
 {
+	uiComponents.apply<WorldOverlay>(&WorldOverlay::render, getShader());
 	glDisable(GL_DEPTH_TEST);
 	uiComponents.apply(&UIComponent::render, uiShader, UIComponent::Position {});
 }
diff --git a/ui/worldOverlay.h b/ui/worldOverlay.h
new file mode 100644
index 0000000..028122a
--- /dev/null
+++ b/ui/worldOverlay.h
@@ -0,0 +1,9 @@
+#pragma once
+
+class Shader;
+
+class WorldOverlay {
+public:
+	virtual ~WorldOverlay() = default;
+	virtual void render(const Shader &) const = 0;
+};
-- 
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