shaders/cgshader/orcgshader_shader.cxx

/***************************************************************************************
 Autodesk(R) Open Reality(R) Samples
 
 (C) 2009 Autodesk, Inc. and/or its licensors
 All rights reserved.
 
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***************************************************************************************/

#ifndef ORSDK_DLL

    #define ORSDK_DLL K_DLLEXPORT
#endif

// Class declaration
#include "orcgshader_shader.h"

#include <math.h>

//--- Registration defines
#define ORCGSHADER__CLASS       ORCGSHADER__CLASSNAME
#define ORCGSHADER__DESC        "OR - Simple CgShader"

//--- FiLMBOX Registration & Implementation.
FBShaderImplementation( ORCGSHADER__CLASS   );
FBRegisterShader    (   ORCGSHADER__DESCSTR,
                        ORCGSHADER__CLASS,
                        ORCGSHADER__DESCSTR,
                        ORCGSHADER__DESC,
                        FB_DEFAULT_SDK_ICON );  // Icon filename (default=Open Reality icon)

/************************************************
 *  FiLMBOX Constructor.
 ************************************************/
bool ORCgShader::FBCreate()
{
    mRenderFrameId = 0;

    //Use GL_ARB_vertex_program extension if supported by video card
    if( cgGLIsProfileSupported(CG_PROFILE_ARBVP1) ) mProfile = CG_PROFILE_ARBVP1;
    else if( cgGLIsProfileSupported(CG_PROFILE_VP20) ) mProfile = CG_PROFILE_VP20;
    else
    {
        ShowError("Vertex programming extensions (GL_ARB_vertex_program or GL_NV_vertex_program) not supported");
        return false;
    }

    //Create Cg Context
    mContext = cgCreateContext();
    if( mContext )
    {
        FBProgress Progress;
        Progress.Caption = "Loading Cg Shader...";

        // We need the full path to our Cg file.
        FBSystem lSystem;
        FBString lCgFile( lSystem.ApplicationPath );
        lCgFile += "\\..\\..\\OpenRealitySDK\\Samples\\shaders\\cgshader\\Simple.cg";

        //Load simple.cg program
        mProgram = cgCreateProgramFromFile(mContext, CG_SOURCE, (char*)lCgFile, mProfile, NULL, NULL);
        if( mProgram ) cgGLLoadProgram(mProgram);
        else
        {
            ShowError();
            return false;
        }

        //Get program parameters
        mParamLight = cgGetNamedParameter(mProgram, "LightVec");
        mParamModelViewProj = cgGetNamedParameter(mProgram, "ModelViewProj");
        mParamModelViewIT = cgGetNamedParameter(mProgram, "ModelViewIT");
        if( !mParamLight || !mParamModelViewProj || !mParamModelViewIT )
        {
            ShowError("Unable to retrieve vertex program parameters.");
            return false;
        }
    }
    else return false;

    return true;
}


/************************************************
 *  FiLMBOX Destructor.
 ************************************************/
void ORCgShader::FBDestroy()
{
    if (mContext)
    {
        cgDestroyContext(mContext);
    }
}

/************************************************
 *  Shader functions.
 ************************************************/
bool ORCgShader::ShaderNeedBeginRender()
{
    return true;
}

void ORCgShader::ShaderBeginRender( FBRenderOptions* pRenderOptions, FBShaderModelInfo* pShaderModelInfo )
{
    int lRenderFrameId = pRenderOptions->GetRenderFrameId();
    if( mRenderFrameId == 0 || mRenderFrameId != lRenderFrameId ) {
        mRenderFrameId = lRenderFrameId;

        // Do setup for the current rendering pass.
    }
}

void ORCgShader::ShadeModel( FBRenderOptions* pRenderOptions, FBShaderModelInfo* pShaderModelInfo, FBRenderingPass pPass )
{
    /***************************************************************************************
    * Make sure everything in OpenGL is the same on exit as when it entered this function! *
    ***************************************************************************************/
    if( pShaderModelInfo != NULL )
    {
        cgGLBindProgram(mProgram);      //Bind program. (You can bind only one vertex and one fragment program at a time)
        cgGLEnableProfile(mProfile);

        cgGLSetParameter4f(mParamLight, 0.0, 0.0, 1.0, 1.0);

        cgGLSetStateMatrixParameter(mParamModelViewProj, CG_GL_MODELVIEW_PROJECTION_MATRIX, CG_GL_MATRIX_IDENTITY);
        cgGLSetStateMatrixParameter(mParamModelViewIT, CG_GL_MODELVIEW_MATRIX, CG_GL_MATRIX_INVERSE_TRANSPOSE);

        glEnable(GL_LIGHTING);
            DrawGeometry(pShaderModelInfo);
        glDisable(GL_LIGHTING);

        cgGLDisableProfile(mProfile);
    }
}

void ORCgShader::DrawGeometry( FBShaderModelInfo* pShaderModelInfo )
{
    FBModelVertexData* lModelVertexData = pShaderModelInfo->GetFBModel()->ModelVertexData;
    if (lModelVertexData)
    {
        const int lSubRegionCount = lModelVertexData->GetSubRegionCount();
        if (lSubRegionCount)
        {
            lModelVertexData->EnableOGLVertexData();

            for (int lSubRegionIndex = 0; lSubRegionIndex < lSubRegionCount; lSubRegionIndex++)
            {
                //FBMaterial* lMaterial = lModelVertexData->GetSubRegionMaterial(lSubRegionIndex);
                lModelVertexData->DrawSubRegion(lSubRegionIndex);
            }

            lModelVertexData->DisableOGLVertexData();
        }
    }
}

void ORCgShader::ShowError(const char* pText)
{
    const char* lErrStr = ( pText ) ? pText : cgGetErrorString(cgGetError());
    FBMessageBox( "Cg Error", lErrStr, "OK", NULL, NULL, 0 );
}