VolShader.h

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//------------------------------------------------------------------------
//
//   Joe Kniss
//     6-17-03
//                   ________    ____   ___ 
//                  |        \  /    | /  /
//                  +---+     \/     |/  /
//                  +--+|  |\    /|     < 
//                  |  ||  | \  / |  |\  \ 
//                  |      |  \/  |  | \  \ 
//                   \_____|      |__|  \__\
//                       Copyright  2003 
//                      Joe Michael Kniss
//                   <<< jmk@cs.utah.edu >>>
//               "All Your Base are Belong to Us"
//-------------------------------------------------------------------------

/// VolShader.h
///  Base class for Simian Volume Shaders
///  also implements the shader for drawing the outlines of slices

#ifndef __VOL_SHADER_DOT_H
#define __VOL_SHADER_DOT_H

#include <stateGlift.h>
#include <textureGlift.h>
#include <smartptr.h>
#include <simBase/simBase.h>

class VolShader : 
   public glift::StateGLI, 
   public SimBase
{
public:
   VolShader();
   virtual ~VolShader();

   ////////////////////////////////////////////////////////////
   /// Set/get Pixel Shader, a user policy
   void                  setPixelShader(glift::PixelShader *ps);
   glift::PixelShaderSP  getPixelShader();

   ////////////////////////////////////////////////////////////
   /// Set/get Vertex Shader, a user policy
   void                   setVertexShader(glift::VertexShader *vs);
   glift::VertexShaderSP  getVertexShader();

   /// blend modes
   enum{
      BLEND_NONE,     ///blending off
      BLEND_F2B,      ///Front to back
      BLEND_B2F,      ///Back to front
      BLEND_MODE_LAST ///add new modes after this enum value
   };
   /// blend defaults to NONE
   void  setBlend(int blendMode);
   int   getBlend() const {return _blendMode;}

protected:


   /////////////////////////////////////////////
   /// Defs
   /// Override these to change the behavior 
   ///  of this class, default draws lines
   virtual void bindDef();
   virtual void releaseDef();

   /////////////////////////////////////////////
   /// State
   /// Bind and release all state in the 
   /// state array.
   virtual void bindState();
   virtual void releaseState();

   /////////////////////////////////////////////
   /// Shaders
   /// You probably won't need to override these,
   ///  They do what ya expect
   virtual void bindShaders();
   virtual void releaseShaders();

   /////////////////////////////////////////////
   /// Blend
   /// You probably won't need to override these,
   ///  They do what ya expect
   virtual void bindBlend();
   virtual void releaseBlend();

   glift::PixelShaderSP  _curPixShade;
   glift::VertexShaderSP _curVertShade;

   glift::VecStateP     _state;

   int _blendMode;

private:

};

typedef gutz::SmartPtr<VolShader> VolShaderSP;

#endif

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