shader.h

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//////////////////////////////////////////////////////////////////////
// 6/6/02       Aaron Lefohn    Scientific Computing and Imaging Institute
// School of Computing          University of Utah
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#if !defined(AFX_SHADER_H__FF91240C_EB1B_463E_8FC1_11FF08D6743C__INCLUDED_)
#define AFX_SHADER_H__FF91240C_EB1B_463E_8FC1_11FF08D6743C__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "stateGLI.h"
#include "progShader.h"
#include "../texture/texture.h"
#include "../texture/subTex.h"
#include "../texture/multiTex.h"
#include "../texCoordGen/texCoordGen.h"
#include "../texCoordGen/texCoordPerturb.h"

#include <vector>

namespace glift {


/////////////////////////////////////////////////////////////////////////
///
/// Shader.h: interface for the Shader class.
///
/// - This class is designed to encapsulate all lighting, shading, texturing, etc
///   that is required for drawing a primitive.
/// - The default constructor is for primitives drawn with no textures or shaders
/// - This class should be subclassed to specify other required drawing state required
///   for a particular effect. The intent is to add calls to 'bindDef()' and 'release()'
///   in the subclasses.
///////////////////
class _export_ Shader : public StateGLI, 
   public MultiTexCoordGen
{
public:
   Shader( GenState* genState );
   Shader( const VecStateP& genAttribs );
   Shader( Texture* tex, GenState* genState=NULL );
   Shader( Texture* tex, const VecStateP& genAttribs );
   Shader( Texture* tex, ProgShader* progShader, GenState* genState=NULL );
   Shader( Texture* tex, ProgShader* progShader, const VecStateP& genAttribs );

   Shader( const Shader& rhs );
   Shader& operator=( const Shader& rhs );

   virtual ~Shader();

   /// The 'MultiTexCrdGenerator' interface
   /// Generate appropriate texture coordinates, taking into account 
   /// multiTexturing, texCoordTransforms, and texture contants
   virtual MultiTexCoord* genTexCoords( const gutz::arrayw2f& rawTexCoord, const gutz::vec3f& primScale ) const;

   /// Accessors
   int  numTexUnits() const {return (m_texture ? m_texture->numTexUnits() : 0); }

protected:
   virtual void bindDef();
   virtual void releaseDef();

private:
   Texture*     m_texture;              /// Pointer to a texture object
   ProgShader*  m_progShader;   /// Pointer to programmable shader object.
   VecStateP    m_genAttribs;   /// Pointers to other attributes

   Shader();
   void initMembers( Texture* texturePtr, ProgShader* progShader, const VecStateP& genAttribs );
   void initMembers( const Shader& rhs );
   void checkTexture();
};

} /// End of namespace glift

#endif /// !defined(AFX_SHADER_H__FF91240C_EB1B_463E_8FC1_11FF08D6743C__INCLUDED_)

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