C++ State::setTexCoordPointer方法代码示例

void
MPGeometry::renderPrimitiveSets(osg::State& state,
                                bool        usingVBOs) const
{
    // check the map frame to see if it's up to date
    if ( _frame.needsSync() )
    {
        // this lock protects a MapFrame sync when we have multiple DRAW threads.
        Threading::ScopedMutexLock exclusive( _frameSyncMutex );

        if ( _frame.needsSync() && _frame.sync() ) // always double check
        {
            // This should only happen is the layer ordering changes;
            // If layers are added or removed, the Tile gets rebuilt and
            // the point is moot.
            std::vector<Layer> reordered;
            const ImageLayerVector& layers = _frame.imageLayers();
            reordered.reserve( layers.size() );
            for( ImageLayerVector::const_iterator i = layers.begin(); i != layers.end(); ++i )
            {
                std::vector<Layer>::iterator j = std::find( _layers.begin(), _layers.end(), i->get()->getUID() );
                if ( j != _layers.end() )
                    reordered.push_back( *j );
            }
            _layers.swap( reordered );
        }
    }

    unsigned layersDrawn = 0;


    osg::ref_ptr<osg::GL2Extensions> ext = osg::GL2Extensions::Get( state.getContextID(), true );
    const osg::Program::PerContextProgram* pcp = state.getLastAppliedProgramObject();

    GLint opacityLocation;
    GLint uidLocation;
    GLint orderLocation;
    GLint texMatParentLocation;

    // yes, it's possible that the PCP is not set up yet.
    // TODO: can we optimize this so we don't need to get uni locations every time?
    if ( pcp )
    {
        opacityLocation      = pcp->getUniformLocation( _opacityUniform->getNameID() );
        uidLocation          = pcp->getUniformLocation( _layerUIDUniform->getNameID() );
        orderLocation        = pcp->getUniformLocation( _layerOrderUniform->getNameID() );
        texMatParentLocation = pcp->getUniformLocation( _texMatParentUniform->getNameID() );
    }

    // activate the tile coordinate set - same for all layers
    state.setTexCoordPointer( _imageUnit+1, _tileCoords.get() );

    if ( _layers.size() > 0 )
    {
        float prev_opacity        = -1.0f;
        float prev_alphaThreshold = -1.0f;

        // first bind any shared layers
        // TODO: optimize by pre-storing shared indexes
        for(unsigned i=0; i<_layers.size(); ++i)
        {
            const Layer& layer = _layers[i];

            // a "shared" layer binds to a secondary texture unit so that other layers
            // can see it and use it.
            if ( layer._imageLayer->isShared() )
            {
                int sharedUnit = layer._imageLayer->shareImageUnit().get();
                {
                    state.setActiveTextureUnit( sharedUnit );
                    state.setTexCoordPointer( sharedUnit, layer._texCoords.get() );
                    // bind the texture for this layer to the active share unit.
                    layer._tex->apply( state );

                    // no texture LOD blending for shared layers for now. maybe later.
                }
            }
        }

        // track the active image unit.
        int activeImageUnit = -1;

        // interate over all the image layers
        for(unsigned i=0; i<_layers.size(); ++i)
        {
            const Layer& layer = _layers[i];

            if ( layer._imageLayer->getVisible() )
            {
                // activate the visible unit if necessary:
                if ( activeImageUnit != _imageUnit )
                {
                    state.setActiveTextureUnit( _imageUnit );
                    activeImageUnit = _imageUnit;
                }

                // bind the texture for this layer:
                layer._tex->apply( state );

                // if we're using a parent texture for blending, activate that now
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        birthTimeLocation    = pcp->getUniformLocation( _birthTimeUniformNameID );
        opacityLocation      = pcp->getUniformLocation( _opacityUniformNameID );
        uidLocation          = pcp->getUniformLocation( _uidUniformNameID );
        orderLocation        = pcp->getUniformLocation( _orderUniformNameID );
        texMatParentLocation = pcp->getUniformLocation( _texMatParentUniformNameID );
        minRangeLocation = pcp->getUniformLocation( _minRangeUniformNameID );
        maxRangeLocation = pcp->getUniformLocation( _maxRangeUniformNameID );
    }
    
    // apply the tilekey uniform once.
    if ( tileKeyLocation >= 0 )
    {
        ext->glUniform4fv( tileKeyLocation, 1, _tileKeyValue.ptr() );
    }

    // set the "birth time" - i.e. the time this tile last entered the scene in the current GC.
    if ( birthTimeLocation >= 0 )
    {
        PerContextData& pcd = _pcd[contextID];
        if ( pcd.birthTime < 0.0f )
        {
            const osg::FrameStamp* stamp = state.getFrameStamp();
            if ( stamp )
            {
                pcd.birthTime = stamp->getReferenceTime();
            }
        }
        ext->glUniform1f( birthTimeLocation, pcd.birthTime );
    }

    // activate the tile coordinate set - same for all layers
    if ( renderColor )
    {
        state.setTexCoordPointer( _imageUnit+1, _tileCoords.get() );
    }

#ifndef OSG_GLES2_AVAILABLE
    if ( renderColor )
    {
        // emit a default terrain color since we're not binding a color array:
        glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
    }
#endif

    // activate the elevation texture if there is one. Same for all layers.
    //if ( _elevTex.valid() )
    //{
    //    state.setActiveTextureUnit( 2 );
    //    state.setTexCoordPointer( 1, _tileCoords.get() ); // necessary?? since we do it above
    //    _elevTex->apply( state );
    //    // todo: probably need an elev texture matrix as well. -gw
    //}
    

    // track the active image unit.
    int activeImageUnit = -1;

    // remember whether we applied a parent texture.
    bool usedTexParent = false;

    if ( _layers.size() > 0 )
    {
        float prev_opacity        = -1.0f;

        // first bind any shared layers. We still have to do this even if we are
        // in !renderColor mode b/c these textures could be used by vertex shaders

void
MPGeometry::renderPrimitiveSets(osg::State& state,
                                bool        usingVBOs) const
{
    // check the map frame to see if it's up to date
    if ( _frame.needsSync() )
    {
        // this lock protects a MapFrame sync when we have multiple DRAW threads.
        Threading::ScopedMutexLock exclusive( _frameSyncMutex );

        if ( _frame.needsSync() && _frame.sync() ) // always double check
        {
            // This should only happen is the layer ordering changes;
            // If layers are added or removed, the Tile gets rebuilt and
            // the point is moot.
            std::vector<Layer> reordered;
            const ImageLayerVector& layers = _frame.imageLayers();
            reordered.reserve( layers.size() );
            for( ImageLayerVector::const_iterator i = layers.begin(); i != layers.end(); ++i )
            {
                std::vector<Layer>::iterator j = std::find( _layers.begin(), _layers.end(), i->get()->getUID() );
                if ( j != _layers.end() )
                    reordered.push_back( *j );
            }
            _layers.swap( reordered );
        }
    }

    unsigned layersDrawn = 0;


    // access the GL extensions interface for the current GC:
    osg::ref_ptr<osg::GL2Extensions> ext = osg::GL2Extensions::Get( state.getContextID(), true );
    const osg::Program::PerContextProgram* pcp = state.getLastAppliedProgramObject();

    // cannot store these in the object since there could be multiple GCs (and multiple
    // PerContextPrograms) at large
    GLint tileKeyLocation;
    GLint opacityLocation;
    GLint uidLocation;
    GLint orderLocation;
    GLint texMatParentLocation;

    // The PCP can change (especially in a VirtualProgram environment). So we do need to
    // requery the uni locations each time unfortunately. TODO: explore optimizations.
    if ( pcp )
    {
        tileKeyLocation      = pcp->getUniformLocation( _tileKeyUniformNameID );
        opacityLocation      = pcp->getUniformLocation( _opacityUniformNameID );
        uidLocation          = pcp->getUniformLocation( _uidUniformNameID );
        orderLocation        = pcp->getUniformLocation( _orderUniformNameID );
        texMatParentLocation = pcp->getUniformLocation( _texMatParentUniformNameID );
    }
    
    // apply the tilekey uniform once.
    ext->glUniform4fv( tileKeyLocation, 1, _tileKeyValue.ptr() );

    // activate the tile coordinate set - same for all layers
    state.setTexCoordPointer( _imageUnit+1, _tileCoords.get() );

    if ( _layers.size() > 0 )
    {
        float prev_opacity        = -1.0f;
        float prev_alphaThreshold = -1.0f;

        // first bind any shared layers
        // TODO: optimize by pre-storing shared indexes
        for(unsigned i=0; i<_layers.size(); ++i)
        {
            const Layer& layer = _layers[i];

            // a "shared" layer binds to a secondary texture unit so that other layers
            // can see it and use it.
            if ( layer._imageLayer->isShared() )
            {
                int sharedUnit = layer._imageLayer->shareImageUnit().get();
                {
                    state.setActiveTextureUnit( sharedUnit );
                    state.setTexCoordPointer( sharedUnit, layer._texCoords.get() );
                    // bind the texture for this layer to the active share unit.
                    layer._tex->apply( state );

                    // no texture LOD blending for shared layers for now. maybe later.
                }
            }
        }

        // track the active image unit.
        int activeImageUnit = -1;

        // interate over all the image layers
        //glDepthMask(GL_TRUE);
        for(unsigned i=0; i<_layers.size(); ++i)
        {
          //  if ( i > 0 )
            //    glDepthMask(GL_FALSE);

            const Layer& layer = _layers[i];

            if ( layer._imageLayer->getVisible() )
//.........这里部分代码省略.........