shaders/cgshaderfractal/orcgshaderfractal_shader.cxx

/***************************************************************************************
 Autodesk(R) Open Reality(R) Samples
 
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***************************************************************************************/

// Class declaration
#include "orcgshaderfractal_shader.h"

#include <math.h>

//--- Registration defines
#define ORCGSHADER__CLASS       ORCGSHADER__CLASSNAME
#define ORCGSHADER__DESC        "OR - Fractal 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 ORCgShaderFractal::FBCreate()
{
    mRenderFrameId = 0;
    mScaling = SCALE_MAX;
    mTransX = -0.401f;
    mTransY = -0.30925f;

    //Check to see if GL_NV_fragment_program is supported
    if( cgGLIsProfileSupported(CG_PROFILE_FP30) ) mProfile = CG_PROFILE_FP30;
    else
    {
        ShowError("Vertex programming extension (GL_NV_fragment_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\\cgshaderfractal\\Mandelbrot.cg";

        //Load Mandelbrot.cg program
        mProgram = cgCreateProgramFromFile(mContext, CG_SOURCE, (char*)lCgFile, mProfile, NULL, NULL);
        if( mProgram ) cgGLLoadProgram(mProgram);
        else ShowError();

        return true;
    }

    return false;
}


/************************************************
 *  FiLMBOX Destructor.
 ************************************************/
void ORCgShaderFractal::FBDestroy()
{
}

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

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

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

void ORCgShaderFractal::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);

        DrawGeometry(pShaderModelInfo);

        cgGLDisableProfile(mProfile);
    }
}

void ORCgShaderFractal::DrawGeometry( FBShaderModelInfo* pShaderModelInfo )
{
    FBModel* lModel = pShaderModelInfo->GetFBModel();
    FBModelVertexData* lModelVertexData = lModel->ModelVertexData;

    // Fill up fractal UV array.
    const int lVertexCount = lModelVertexData->GetVertexCount();
    FBArrayTemplate<FBUV> lUVArray; lUVArray.SetCount(lVertexCount);

    for(int i = 0, TexCoordIndex = 0; i < lVertexCount; ++i)
    {
        switch( TexCoordIndex )
        {
        case 0: lUVArray.SetAt(i, FBUV(mTransX + mScaling, mTransY - mScaling)); break;
        case 1: lUVArray.SetAt(i, FBUV(mTransX - mScaling, mTransY - mScaling)); break;
        case 2: lUVArray.SetAt(i, FBUV(mTransX - mScaling, mTransY + mScaling)); break;
        case 3: lUVArray.SetAt(i, FBUV(mTransX + mScaling, mTransY + mScaling)); break;
        }

        TexCoordIndex++;
        if( TexCoordIndex >= 4 ) TexCoordIndex = 0;
    }

    lModelVertexData->EnableOGLVertexData();
    glTexCoordPointer( 2, GL_FLOAT, 0, lUVArray.GetArray());
    glEnableClientState( GL_TEXTURE_COORD_ARRAY );

    const int lSubRegionCount = lModelVertexData->GetSubRegionCount();
    for (int i = 0; i < lSubRegionCount; ++i)
        lModelVertexData->DrawSubRegion(i);

    glDisableClientState( GL_TEXTURE_COORD_ARRAY );
    lModelVertexData->DisableOGLVertexData();

    //Animate Fractal by modifying texture coordinates
    mScaling *= 0.99f;
    if( mScaling < SCALE_MIN ) mScaling = SCALE_MAX;
}

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