acg.h

GLSL tutorial with sourcecode

// ================================================
// Support for NVidia CG Programs
// Adds support for Nvidia CG Programs
// (2 profiles)
//
// This is just a prototype and doesn't work yet.
//
// (c) 2004 by Martin Christen. All Rights Reserved
// ================================================

#include "aGLSL.h"
#include <Cg/cg.h>    
#include <Cg/cgGL.h>
#include <iostream>
#include <vector>

//-----------------------------------------------------------------------------

class aShaderProgramCg
{
public:
	virtual int load(char* filename) = 0;  //!< read file, if result is 0 everything is ok. -1: File not found, -2: Empty File, -3: no memory, -9: This machine doesn't support CG
	
	virtual bool compile(void) = 0;   //!< compile program (currently load function compiles too)

	virtual char* getCompilerLog(void) = 0;   //!< get compiler messages (currently not working)


private:
	    CGcontext   _Context;
        CGprogram   _Program;
        CGprogram   _KdParam;
      
        // Benutzerfedinierte Parameter
        std::vector<CGparameter> _ParamList;
        
        CGprofile   _profile;
	
};

//-----------------------------------------------------------------------------

class aVertexShaderCg : public aShaderProgramCg
{
  public:
	aVertexShaderCg()
	{	_Program = 0;
    }    
        

    ~aVertexShaderCg()

    int load(char* filename)
	{
        if (cgGLIsProfileSupported(CG_PROFILE_VP30))
        {
            _profile = CG_PROFILE_VP30;
        }
        else
        {   

            if (cgGLIsProfileSupported(CG_PROFILE_ARBVP1))
            {
            _profile = CG_PROFILE_ARBVP1;
            }
            else 
            {
                return -9;
            }
        }

        _Context = cgCreateContext();
        _Program = cgCreateProgramFromFile(_Context,CG_SOURCE, filename, _profile, NULL, NULL);

         cgGLLoadProgram(_Program);
         //_ModelViewProjParam = cgGetNamedParameter(_Program, "ModelViewProj");
	     return 0;
	}

};

//-----------------------------------------------------------------------------

class aFragmentShaderCg : public aShaderProgramCg
{
  public:
       aFragmentShaderCg();
       ~aFragmentShaderCg();
	   

  private:
};

//-----------------------------------------------------------------------------

class aShaderObjectCg
{
  public:
		aShaderObjectCg();
		~aShaderObjectCg();

		void addShader(aFragmentShaderCg* ShaderProgram); // add Fragment Shader
		void addShader(aVertexShaderCg* ShaderProgram);   // add Vertex Shader

		sendUniform1f(char* varname, float value);
		sendUniform2f(char* varname, float v1, float v2);
		sendUniform3f(char* varname, float v1, float v2, float v3);
		sendUniform4f(char* varname, float v1, float v2, float v3, float v4);


  private:
	aFragmentShaderCg* _F;
    aVertexShaderCg*   _V;

};

//-----------------------------------------------------------------------------