shaders/shader_template/orshader_template_shader.cxx

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

#ifndef ORSDK_DLL

    #define ORSDK_DLL K_DLLEXPORT
#endif

// Class declaration
#include "orshader_template_shader.h"
#include <fbsdk/fbsdk-opengl.h>

#include <math.h>

//--- Registration defines
#define ORSHADER_TEMPLATE__CLASS        ORSHADER_TEMPLATE__CLASSNAME
#define ORSHADER_TEMPLATE__DESC         "OR - Shader Template Description"

//--- FiLMBOX Registration & Implementation.
FBShaderImplementation( ORSHADER_TEMPLATE__CLASS    );
FBRegisterShader    (   ORSHADER_TEMPLATE__DESCSTR,
                        ORSHADER_TEMPLATE__CLASS,
                        ORSHADER_TEMPLATE__DESCSTR,
                        ORSHADER_TEMPLATE__DESC,
                        FB_DEFAULT_SDK_ICON         );  // Icon filename (default=Open Reality icon)


/************************************************
 *  Specific Constructor. Construct custom shader from an FBMaterial object.
 ************************************************/
ORShader_Template::ORShader_Template(FBMaterial *pMaterial):FBShader(pMaterial->Name)
{
    FBClassInit;
    mMaterial = pMaterial;
}

/************************************************
 *  FiLMBOX Constructor.
 ************************************************/
bool ORShader_Template::FBCreate()
{
    mRenderFrameId = 0;
    return true;
}


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

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

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

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

void ORShader_Template::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 )
    {
        float lTemp[4];
        FBVertex lVertex;

        glEnable( GL_LIGHTING);
        lTemp[0] = 0.6f;
        lTemp[1] = 0.9f;
        lTemp[2] = 0.67f;
        lTemp[3] = 1.0f;
        glMaterialfv( GL_FRONT, GL_AMBIENT, lTemp );

        FBModelVertexData* lModelVertexData = pShaderModelInfo->GetFBModel()->ModelVertexData;
        if (lModelVertexData)
        {
            //Get number of region mapped by different materials.
            const int lSubRegionCount = lModelVertexData->GetSubRegionCount();
            if (lSubRegionCount)
            {
                //Set up vertex buffer object (VBO) or vertex array
                lModelVertexData->EnableOGLVertexData();

                for (int lSubRegionIndex = 0; lSubRegionIndex < lSubRegionCount; lSubRegionIndex++)
                {
                    // Setup material, texture, shader, parameters here.
                    /* 
                    FBMaterial* lMaterial = lModelVertexData->GetSubRegionMaterial(lSubRegionIndex);
                    */
                    lModelVertexData->DrawSubRegion(lSubRegionIndex);

                    //Cleanup material, texture, shader, parameters here
                }

                lModelVertexData->DisableOGLVertexData();
            }
        }

        glDisable( GL_LIGHTING);

        // MB could use GPU for skinning deformation, and thus all deformation result reside in GPU only.
        bool lDisplayNormal = pShaderModelInfo->GetFBModel()->IsDeformable == false;
        if( lDisplayNormal )
        {
            // All the nurbs/patch surface are tessellated
            FBMesh* lTessellatedMesh = pShaderModelInfo->GetFBModel()->TessellatedMesh;

            if (lTessellatedMesh->NormalMappingMode == kFBGeometryMapping_BY_CONTROL_POINT)
            {
                int lPosCount = lTessellatedMesh->VertexCount();
                float* lPositionArray = (float*)lTessellatedMesh->GetVertexes();

                int lNormalCount = 0;
                float* lNormalArray = (float*)lTessellatedMesh->GetNormalsDirectArray(lNormalCount);

                assert(lNormalCount == lPosCount);

                const float lNormalLentgh = 1.02f;

                float   lx, ly, lz, lLen;

                glDisable( GL_LIGHTING );
                glColor3ub( 0, 255, 0 );
                glBegin( GL_LINES );
                while( lPosCount )
                {
                    glVertex3fv( lPositionArray );

                    lx = lNormalArray[0];
                    ly = lNormalArray[1];
                    lz = lNormalArray[2];

                    lLen = sqrt( lx*lx + ly*ly + lz*lz ) /lNormalLentgh;

                    lx /= lLen;
                    ly /= lLen;
                    lz /= lLen;

                    glVertex3f( lPositionArray[0] + ( lx ), lPositionArray[1] + ( ly ), lPositionArray[2] + ( lz ) );

                    lPositionArray  +=4;
                    lNormalArray    +=4;

                    lPosCount --;
                }
                glEnd();
            }
        }// Display Normal
    }
}