X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fpostprocessor.h;h=0666dd46c9cf2eb23e7bc4568cdea889fbf5c484;hb=904de4f7fd994886adbd3a6c03bc1b7c14ebc562;hp=25ed150a53f803b08f763c74c9a4836196ee99df;hpb=936a307eaf8dafd0874c74d211e991bd81a74387;p=libs%2Fgl.git

diff --git a/source/postprocessor.h b/source/postprocessor.h
index 25ed150a..0666dd46 100644
--- a/source/postprocessor.h
+++ b/source/postprocessor.h
@@ -1,32 +1,41 @@
-/* $Id$
-
-This file is part of libmspgl
-Copyright © 2009  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #ifndef MSP_GL_POSTPROCESSOR_H_
 #define MSP_GL_POSTPROCESSOR_H_
 
 namespace Msp {
 namespace GL {
 
+class Mesh;
+class Shader;
 class Texture2D;
 
 /**
-Base class for post-processing effects.
+Base class for post-processing effects.  Post-processors receive the contents
+of the entire framebuffer as a texture and render it back, altering it in the
+process.
 */
 class PostProcessor
 {
 protected:
 	PostProcessor() { }
 public:
-	virtual ~PostProcessor();
+	virtual ~PostProcessor() { }
 
-	/**
-	Renders the effect.  Takes the source texture as a parameter.
-	*/
-	virtual void render(const Texture2D &) =0;
+	/// Renders the effect.
+	virtual void render(const Texture2D &color, const Texture2D &depth) = 0;
+
+protected:
+	/** Returns a vertex shader suitable for rendering a full-screen quad.
+	Input vertices are assumed to be in normalized device coordinates; no
+	transform is performed.  The shader provides a varying vec2 texcoord for
+	a fragment shader to access textures. */
+	static Shader &get_fullscreen_vertex_shader();
+
+	/** Returns a mesh consisting of a single quad, covering the entire screen.
+	The vertices are in normalized device coordinates. */
+	static const Mesh &get_fullscreen_quad();
+
+private:
+	static const Mesh &create_fullscreen_quad();
 };
 
 } // namespace GL