X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fpostprocessor.h;h=0666dd46c9cf2eb23e7bc4568cdea889fbf5c484;hb=904de4f7fd994886adbd3a6c03bc1b7c14ebc562;hp=9e4220abd84a24b04330727a18bc0cb8e03deacf;hpb=f14435e58bfa0fa697a06ba9a454bb30cd37d9d8;p=libs%2Fgl.git

diff --git a/source/postprocessor.h b/source/postprocessor.h
index 9e4220ab..0666dd46 100644
--- a/source/postprocessor.h
+++ b/source/postprocessor.h
@@ -4,10 +4,14 @@
 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
 {
@@ -16,10 +20,22 @@ protected:
 public:
 	virtual ~PostProcessor() { }
 
-	/**
-	Renders the effect.  Takes the source texture as a parameter.
-	*/
-	virtual void render(const Texture2D &, 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