GBufferMaterialGenerator.h

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2009 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

You may use this sample code for anything you like, it is not covered by the
same license as the rest of the engine.
-----------------------------------------------------------------------------
*/


#ifndef _GBUFFER_MATERIAL_GENERATOR_H_
#define _GBUFFER_MATERIAL_GENERATOR_H_

#include "MaterialGenerator.h"

/** Class for generating materials for objects to render themselves to the GBuffer
 *  @note This does not support all the possible rendering techniques out there.
 *  in order to support more, either expand this class or make sure that objects
 *  that will not get treated correctly will not have materials generated for them.
 */
class GBufferMaterialGenerator : public MaterialGenerator
{
public:
	
	//Constructor
	GBufferMaterialGenerator();

	//The relevant options for objects that are rendered to the GBuffer
	enum GBufferPermutations 
	{
		//(Regular) Textures
		GBP_NO_TEXTURES =			0x00000000,
		GBP_ONE_TEXTURE =			0x00000001,
		GBP_TWO_TEXTURES =			0x00000002,
		GBP_THREE_TEXTURES =		0x00000003,
		GBP_TEXTURE_MASK =			0x0000000F,
		
        //Material properties
        GBP_HAS_DIFFUSE_COLOUR =     0x00000010,

		//The number of texture coordinate sets
		GBP_NO_TEXCOORDS =			0x00000000,
		GBP_ONE_TEXCOORD =			0x00000100,
		GBP_TWO_TEXCOORDS =			0x00000200,
		GBP_TEXCOORD_MASK =			0x00000700,

		//Do we have a normal map
		GBP_NORMAL_MAP =			0x00000800,

		//Are we skinned?
		GBP_SKINNED =				0x00010000
	};
	
	//The mask of the flags that matter for generating the fragment shader
	static const Ogre::uint32 FS_MASK =		0x0000FFFF;
	
	//The mask of the flags that matter for generating the vertex shader
	static const Ogre::uint32 VS_MASK =		0x00FFFF00;
	
	//The mask of the flags that matter for generating the material
	static const Ogre::uint32 MAT_MASK =	0xFF00FFFF;
};

#endif