From d531a1f0a8ea50eb6ff1a372aca81e827e1d2034 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 31 Oct 2019 13:47:22 +0200
Subject: [PATCH] Support rendering View with an externally provided Renderer

This can be useful if an OffscreenView is used to render a sub-scene in
some renderable's setup_frame function.
---
 source/view.cpp       | 9 ++++++++-
 source/view.h         | 2 ++
 source/windowview.cpp | 4 ++--
 source/windowview.h   | 2 +-
 4 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/source/view.cpp b/source/view.cpp
index fe783110..ad6e266c 100644
--- a/source/view.cpp
+++ b/source/view.cpp
@@ -25,12 +25,19 @@ void View::set_content(Renderable *r)
 }
 
 void View::render()
+{
+	Renderer renderer;
+	render(renderer);
+}
+
+void View::render(Renderer &renderer)
 {
 	Bind bind_fbo(target);
 	target.clear(COLOR_BUFFER_BIT|DEPTH_BUFFER_BIT);
 	if(content)
 	{
-		Renderer renderer(camera);
+		Renderer::Push push(renderer);
+		renderer.set_camera(*camera);
 		content->setup_frame(renderer);
 		content->render(renderer);
 		content->finish_frame();
diff --git a/source/view.h b/source/view.h
index cf0f4d64..b34ae5c7 100644
--- a/source/view.h
+++ b/source/view.h
@@ -9,6 +9,7 @@ namespace GL {
 
 class Camera;
 class Renderable;
+class Renderer;
 
 /**
 Manages the presentation of rendering results on the screen.
@@ -31,6 +32,7 @@ public:
 	void set_content(Renderable *);
 
 	virtual void render();
+	virtual void render(Renderer &);
 };
 
 } // namespace GL
diff --git a/source/windowview.cpp b/source/windowview.cpp
index a11f738c..2cce075c 100644
--- a/source/windowview.cpp
+++ b/source/windowview.cpp
@@ -15,9 +15,9 @@ WindowView::WindowView(Graphics::Window &w, Graphics::GLContext &c):
 	window_resized(window.get_width(), window.get_height());
 }
 
-void WindowView::render()
+void WindowView::render(Renderer &renderer)
 {
-	View::render();
+	View::render(renderer);
 	context.swap_buffers();
 }
 
diff --git a/source/windowview.h b/source/windowview.h
index 6ba93f88..0c5e1b1d 100644
--- a/source/windowview.h
+++ b/source/windowview.h
@@ -23,7 +23,7 @@ public:
 	virtual unsigned get_width() const { return window.get_width(); }
 	virtual unsigned get_height() const { return window.get_height(); }
 
-	virtual void render();
+	virtual void render(Renderer &);
 
 private:
 	void window_resized(unsigned, unsigned);
-- 
2.43.0