miscellaneous/texture_template/ortexture_template_texture.cxx

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

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

FBClassImplementation( ORLayeredTextureCustom );                            //Register class
FBStorableCustomTextureImplementation( ORLayeredTextureCustom, Texture );   //Register to the store/retrieve system
FBShadingElementClassImplementation( ORLayeredTextureCustom, "browsing/template_layeredtexture.png" );  //Register to the asset browser shading element category folder.

/************************************************
 *  Constructor.
 ************************************************/
ORLayeredTextureCustom::ORLayeredTextureCustom( const char* pName, HIObject pObject ) : FBLayeredTexture( pName, pObject )
{
    FBClassInit;
}

static void ORLayeredTextureCustom_CustomCompositionSet(HIObject pMbObject, bool pValue)
{
    ORLayeredTextureCustom* pFbObject = FBCast<ORLayeredTextureCustom>( pMbObject );
    pFbObject->CustomComposition.SetPropertyValue(pValue);
    pFbObject->SetLayerConfigDirty();
}

/************************************************
 *  FiLMBOX Constructor.
 ************************************************/
bool ORLayeredTextureCustom::FBCreate()
{
    FBPropertyInitTextureConnectable(this, AuxLayer, "AuxLayer" );
    FBPropertyPublish(this, CustomComposition, "CustomComposition", NULL, ORLayeredTextureCustom_CustomCompositionSet);

    AuxLayer = FBColorAndAlpha(1.0, 0.0, 0.0, 1.0);
    CustomComposition = true;

    return true;
}

/************************************************
 *  FiLMBOX Destructor.
 ************************************************/
void ORLayeredTextureCustom::FBDestroy()
{
    ParentClass::FBDestroy();
}

bool ORLayeredTextureCustom::FbxStore(FBFbxObject* pFbxObject, kFbxObjectStore pStoreWhat)
{
    ParentClass::FbxStore(pFbxObject, pStoreWhat);

    return true;
}

bool ORLayeredTextureCustom::FbxRetrieve(FBFbxObject* pFbxObject, kFbxObjectStore pStoreWhat)
{
    ParentClass::FbxRetrieve(pFbxObject, pStoreWhat);

    return true;
}

bool ORLayeredTextureCustom::PlugDataNotify(FBConnectionAction pAction,FBPlug* pThis,void* pData,void* pDataOld,int pDataSize)
{
    if (pThis == &AuxLayer)
    {
        switch (pAction)
        {
        case kFBCandidated:
            {
                SetLayerConfigDirty();
            }
            break;
        default:
            break;
        }
    }

    return ParentClass::PlugDataNotify(pAction, pThis, pData, pDataOld, pDataSize);
}

bool ORLayeredTextureCustom::EvaluateAnimationNodes( FBEvaluateInfo* pEvaluateInfo )
{
    ParentClass::EvaluateAnimationNodes(pEvaluateInfo);

    if (CustomComposition && AuxLayer.IsAnimated())
    {
        // Compute animatable property value in background evaluation thread.
        FBPropertyAnimatableColorAndAlpha::ValueType lTmpValue;
        AuxLayer.GetData(lTmpValue.mValue, sizeof(lTmpValue.mValue), pEvaluateInfo);

        // Trigger composition per frame.
        SetLayerConfigDirty();
    }

    return true;
}

void ORLayeredTextureCustom::TextureLayerComposition(FBTime pTime,FBTime pTimeInCurrentTimeRef, int pWidth, int pHeight)
{
    // 
    // Here we simply demo the default and customized the texture layers blend operations. 
    //  Actually nothing is preventing user to do a more sophisticated real-time composition (keying and etc.,) 
    //  or even a full scene (or shadow map) RTT for advanced fancy tasks. 
    //
    if (! CustomComposition)
    {
        ParentClass::TextureLayerComposition(pTime, pTimeInCurrentTimeRef, pWidth, pHeight);
    }
    else
    {
        //
        //Render-To-Texture already setup. 
        //

        // Push GL states.
        glPushAttrib(GL_VIEWPORT_BIT | GL_ENABLE_BIT | GL_CURRENT_BIT | GL_COLOR_BUFFER_BIT);

        // Clear Buffers.

        // Default implementation use BackgroundColor property. Here AuxLayer is used for demo purpose. 
        // FBColorAndAlpha lBgColor = BackgroundColor;
        FBColorAndAlpha lBgColor = AuxLayer;
        glClearColor(lBgColor[0], lBgColor[1], lBgColor[2], lBgColor[3]);
        glClear(GL_COLOR_BUFFER_BIT);

        glViewport(0,0, pWidth, pHeight);

        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        glOrtho(0, 1, 1, 0, -1, 1);

        glDisable(GL_DEPTH_TEST);
        glDisable(GL_LIGHTING);
        glDisable(GL_FOG);
        glEnable(GL_TEXTURE_2D);
        glEnable(GL_BLEND);

        for (int lLayerIndex = 0, lLayerCount = Layers.GetCount(); lLayerIndex < lLayerCount; lLayerIndex++)
        {
            FBTexture* lTexture = Layers[lLayerIndex];

            // Determine Blend mode.
            switch( lTexture->BlendMode )
            {
            case kFBTextureBlendTranslucent: glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );break;
            case kFBTextureBlendAdditive:    glBlendFunc( GL_SRC_ALPHA, GL_ONE ); break;
            case kFBTextureBlendModulate:    glBlendFunc( GL_ZERO, GL_SRC_COLOR );break;
            case kFBTextureBlendModulate2:   glBlendFunc( GL_DST_COLOR, GL_SRC_COLOR );break;   
            }

            glColor4f(1.0, 1.0, 1.0, lTexture->Alpha);
            
            // Binding the texture with proper parameters and matrix.
            lTexture->OGLInit();

            // Draw quad for blending.
            glBegin(GL_POLYGON);
            glTexCoord2f(0.0, 1.0);
            glVertex2f(0.0, 0.0);
            glTexCoord2f(0.0, 0.0);
            glVertex2f(0.0, 1.0);
            glTexCoord2f(1.0, 0.0);
            glVertex2f(1.0, 1.0);
            glTexCoord2f(1.0, 1.0);
            glVertex2f(1.0, 0.0);                       
            glEnd();
        }

        glMatrixMode(GL_PROJECTION);
        glPopMatrix();
        glMatrixMode(GL_MODELVIEW);
        glPopMatrix();

        // Pop GL states.
        glPopAttrib();
    }
}