void
LogarithmicDepthBuffer::install(osg::Camera* camera)
{
    if ( camera && _supported )
    {
        // install the shader component:
        osg::StateSet* stateset = camera->getOrCreateStateSet();

        if ( _useFragDepth )
        {
            stateset->addUniform( new osg::Uniform(C_UNIFORM, (float)NEAR_RES_COEFF) );
        }
        
        VirtualProgram* vp = VirtualProgram::getOrCreate( stateset );
        Shaders pkg;

        if ( _useFragDepth )
        {
            pkg.loadFunction( vp, pkg.LogDepthBuffer_VertFile );
            pkg.loadFunction( vp, pkg.LogDepthBuffer_FragFile );
        }
        else
        {
            pkg.loadFunction( vp, pkg.LogDepthBuffer_VertOnly_VertFile );
        }

        osg::ref_ptr<osg::Camera::DrawCallback> next = camera->getPreDrawCallback();
        if ( dynamic_cast<SetFarPlaneUniformCallback*>(next.get()) )
            next = static_cast<SetFarPlaneUniformCallback*>(next.get())->_next.get();
        
        stateset->addUniform( _FCUniform.get() );

        camera->setPreDrawCallback( new SetFarPlaneUniformCallback(_FCUniform.get(), next.get()) );
    }
}
void
BumpMapTerrainEffect::onInstall(TerrainEngineNode* engine)
{
    if ( engine && _bumpMapTex.valid() )
    {
        osg::StateSet* stateset = engine->getTerrainStateSet();

        // install the NormalMap texture array:
        if ( engine->getResources()->reserveTextureImageUnit(_bumpMapUnit, "BumpMap") )
        {
            // NormalMap sampler
            _bumpMapTexUniform = stateset->getOrCreateUniform(BUMP_SAMPLER, osg::Uniform::SAMPLER_2D);
            _bumpMapTexUniform->set( _bumpMapUnit );
            stateset->setTextureAttribute( _bumpMapUnit, _bumpMapTex.get(), osg::StateAttribute::ON );

            // configure shaders
            VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);

            Shaders package;            
            package.define( "OE_USE_NORMAL_MAP", engine->normalTexturesRequired() );

            package.loadFunction( vp, package.VertexModel );
            package.loadFunction( vp, package.VertexView );
            package.loadFunction( vp, _octaves <= 1? package.FragmentSimple : package.FragmentProgressive );

            if ( _octaves > 1 )
                stateset->addUniform(new osg::Uniform("oe_bumpmap_octaves", _octaves));

            stateset->addUniform(new osg::Uniform("oe_bumpmap_maxRange", _maxRange));

            stateset->addUniform( _scaleUniform.get() );
            stateset->addUniform( _intensityUniform.get() );
        }
    }
}
Esempio n. 3
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void
DepthOffsetAdapter::setGraph(osg::Node* graph)
{
    if ( !_supported ) return;

    bool graphChanging =
        _graph.get() != graph;

    bool uninstall =
        (_graph.valid() && _graph->getStateSet()) &&
        (graphChanging || (_options.enabled() == false));

    bool install =
        (graph && graphChanging ) || 
        (graph && (_options.enabled() == true));

    // shader package:
    Shaders shaders;

    if ( uninstall )
    {
        OE_TEST << LC << "Removing depth offset shaders" << std::endl;

        // uninstall uniforms and shaders.
        osg::StateSet* s = _graph->getStateSet();
        s->removeUniform( _minBiasUniform.get() );
        s->removeUniform( _maxBiasUniform.get() );
        s->removeUniform( _minRangeUniform.get() );
        s->removeUniform( _maxRangeUniform.get() );
        
        shaders.unloadFunction( VirtualProgram::get(s), shaders.DepthOffsetVertex );
    }

    if ( install )
    {
        OE_TEST << LC << "Installing depth offset shaders" << std::endl;

        // install uniforms and shaders.
        osg::StateSet* s = graph->getOrCreateStateSet();
        s->addUniform( _minBiasUniform.get() );
        s->addUniform( _maxBiasUniform.get() );
        s->addUniform( _minRangeUniform.get() );
        s->addUniform( _maxRangeUniform.get() );
        
        shaders.loadFunction(VirtualProgram::getOrCreate(s), shaders.DepthOffsetVertex);        
    }

    if ( graphChanging )
    {
        _graph = graph;
    }

    // always set Dirty when setGraph is called sine it may be called anytime
    // the subgraph changes (as can be detected by a computeBound)
    _dirty = (_options.automatic() == true);
}
void
NormalMapTerrainEffect::onInstall(TerrainEngineNode* engine)
{
    if ( engine )
    {
        engine->requireNormalTextures();

        engine->getResources()->reserveTextureImageUnit(_normalMapUnit, "NormalMap");
        engine->addTileNodeCallback( new NormalTexInstaller(this, _normalMapUnit) );

        // shader components
        osg::StateSet* stateset = engine->getTerrainStateSet();
        VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);

        // configure shaders
        Shaders package;
        package.loadFunction( vp, package.Vertex );
        package.loadFunction( vp, package.Fragment );

        stateset->addUniform( new osg::Uniform(NORMAL_SAMPLER, _normalMapUnit) );
    }
}
void
GraticuleTerrainEffect::onInstall(TerrainEngineNode* engine)
{
    if ( engine )
    {
        // shader components
        osg::StateSet* stateset = engine->getTerrainStateSet();
        VirtualProgram* vp = VirtualProgram::getOrCreate(stateset);

        // configure shaders
        Shaders package;
        package.loadFunction( vp, package.Graticule_Vertex );
        package.loadFunction( vp, package.Graticule_Fragment);

        stateset->addUniform( new osg::Uniform(
            GraticuleOptions::resolutionUniformName(), 10.0/180.0) );

        stateset->addUniform( new osg::Uniform(
            GraticuleOptions::colorUniformName(), _options.color().get()) );

        stateset->addUniform( new osg::Uniform(
            GraticuleOptions::lineWidthUniformName(), _options.lineWidth().get()) );
    }
}
Esempio n. 6
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// Generates the main shader code for rendering the terrain.
void
MPTerrainEngineNode::updateState()
{
    if ( _batchUpdateInProgress )
    {
        _stateUpdateRequired = true;
    }
    else
    {
        if ( _elevationTextureUnit < 0 && elevationTexturesRequired() )
        {
            getResources()->reserveTextureImageUnit( _elevationTextureUnit, "MP Engine Elevation" );
        }

        osg::StateSet* terrainStateSet = getTerrainStateSet();
        
        // required for multipass tile rendering to work
        terrainStateSet->setAttributeAndModes(
            new osg::Depth(osg::Depth::LEQUAL, 0, 1, true) );

        // activate standard mix blending.
        terrainStateSet->setAttributeAndModes( 
            new osg::BlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA),
            osg::StateAttribute::ON );

        // install shaders, if we're using them.
        if ( Registry::capabilities().supportsGLSL() )
        {
            VirtualProgram* vp = new VirtualProgram();
            vp->setName( "osgEarth.engine_mp.TerrainNode" );
            terrainStateSet->setAttributeAndModes( vp, osg::StateAttribute::ON );

            // bind the vertex attributes generated by the tile compiler.
            vp->addBindAttribLocation( "oe_terrain_attr",  osg::Drawable::ATTRIBUTE_6 );
            vp->addBindAttribLocation( "oe_terrain_attr2", osg::Drawable::ATTRIBUTE_7 );

            Shaders package;

            package.replace( "$MP_PRIMARY_UNIT",   Stringify() << _primaryUnit );
            package.replace( "$MP_SECONDARY_UNIT", Stringify() << (_secondaryUnit>=0?_secondaryUnit:0) );

            package.define( "MP_USE_BLENDING", (_terrainOptions.enableBlending() == true) );

            package.loadFunction( vp, package.VertexModel );
            package.loadFunction( vp, package.VertexView );
            package.loadFunction( vp, package.Fragment );
            

            // terrain background color; negative means use the vertex color.
            Color terrainColor = _terrainOptions.color().getOrUse( Color(1,1,1,-1) );
            terrainStateSet->addUniform(new osg::Uniform("oe_terrain_color", terrainColor));

            
            // assemble color filter code snippets.
            bool haveColorFilters = false;
            {
                // Color filter frag function:
                std::string fs_colorfilters =
                    "#version " GLSL_VERSION_STR "\n"
                    GLSL_DEFAULT_PRECISION_FLOAT "\n"
                    "uniform int oe_layer_uid; \n"
                    "$COLOR_FILTER_HEAD"
                    "void oe_mp_apply_filters(inout vec4 color) \n"
                    "{ \n"
                        "$COLOR_FILTER_BODY"
                    "} \n";

                std::stringstream cf_head;
                std::stringstream cf_body;
                const char* I = "    ";

                // second, install the per-layer color filter functions AND shared layer bindings.
                bool ifStarted = false;
                int numImageLayers = _update_mapf->imageLayers().size();
                for( int i=0; i<numImageLayers; ++i )
                {
                    ImageLayer* layer = _update_mapf->getImageLayerAt(i);
                    if ( layer->getEnabled() )
                    {
                        // install Color Filter function calls:
                        const ColorFilterChain& chain = layer->getColorFilters();
                        if ( chain.size() > 0 )
                        {
                            haveColorFilters = true;
                            if ( ifStarted ) cf_body << I << "else if ";
                            else             cf_body << I << "if ";
                            cf_body << "(oe_layer_uid == " << layer->getUID() << ") {\n";
                            for( ColorFilterChain::const_iterator j = chain.begin(); j != chain.end(); ++j )
                            {
                                const ColorFilter* filter = j->get();
                                cf_head << "void " << filter->getEntryPointFunctionName() << "(inout vec4 color);\n";
                                cf_body << I << I << filter->getEntryPointFunctionName() << "(color);\n";
                                filter->install( terrainStateSet );
                            }
                            cf_body << I << "}\n";
                            ifStarted = true;
                        }
                    }
                }

                if ( haveColorFilters )
                {
                    std::string cf_head_str, cf_body_str;
                    cf_head_str = cf_head.str();
                    cf_body_str = cf_body.str();

                    replaceIn( fs_colorfilters, "$COLOR_FILTER_HEAD", cf_head_str );
                    replaceIn( fs_colorfilters, "$COLOR_FILTER_BODY", cf_body_str );

                    vp->setFunction(
                        "oe_mp_apply_filters",
                        fs_colorfilters,
                        ShaderComp::LOCATION_FRAGMENT_COLORING,
                        0.5f );
                }
            }

            // binding for the terrain texture
            terrainStateSet->getOrCreateUniform( 
                "oe_layer_tex", osg::Uniform::SAMPLER_2D )->set( _primaryUnit );

            // binding for the secondary texture (for LOD blending)
            if ( parentTexturesRequired() )
            {
                terrainStateSet->getOrCreateUniform(
                    "oe_layer_tex_parent", osg::Uniform::SAMPLER_2D )->set( _secondaryUnit );

                // binding for the default secondary texture matrix
                osg::Matrixf parent_mat;
                parent_mat(0,0) = 0.0f;
                terrainStateSet->getOrCreateUniform(
                    "oe_layer_parent_matrix", osg::Uniform::FLOAT_MAT4 )->set( parent_mat );
            }

            // uniform for accessing the elevation texture sampler.
            if ( elevationTexturesRequired() )
            {
                terrainStateSet->getOrCreateUniform(
                    "oe_terrain_tex", osg::Uniform::SAMPLER_2D)->set( _elevationTextureUnit );
            }

            // uniform that controls per-layer opacity
            terrainStateSet->getOrCreateUniform(
                "oe_layer_opacity", osg::Uniform::FLOAT )->set( 1.0f );

            // uniform that conveys the layer UID to the shaders; necessary
            // for per-layer branching (like color filters)
            // UID -1 => no image layer (no texture)
            terrainStateSet->getOrCreateUniform(
                "oe_layer_uid", osg::Uniform::INT )->set( -1 );

            // uniform that conveys the render order, since the shaders
            // need to know which is the first layer in order to blend properly
            terrainStateSet->getOrCreateUniform(
                "oe_layer_order", osg::Uniform::INT )->set( 0 );

            // default min/max range uniforms. (max < min means ranges are disabled)
            terrainStateSet->addUniform( new osg::Uniform("oe_layer_minRange", 0.0f) );
            terrainStateSet->addUniform( new osg::Uniform("oe_layer_maxRange", -1.0f) );
            
            terrainStateSet->getOrCreateUniform(
                "oe_min_tile_range_factor",
                osg::Uniform::FLOAT)->set( *_terrainOptions.minTileRangeFactor() );

            // special object ID that denotes the terrain surface.
            terrainStateSet->addUniform( new osg::Uniform(
                Registry::objectIndex()->getObjectIDUniformName().c_str(), OSGEARTH_OBJECTID_TERRAIN) );
        }

        _stateUpdateRequired = false;
    }
}
Esempio n. 7
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void
DrapingTechnique::setUpCamera(OverlayDecorator::TechRTTParams& params)
{
    // create the projected texture:
    osg::Texture2D* projTexture = new osg::Texture2D();
    projTexture->setTextureSize( *_textureSize, *_textureSize );
    projTexture->setInternalFormat( GL_RGBA );
    projTexture->setSourceFormat( GL_RGBA );
    projTexture->setSourceType( GL_UNSIGNED_BYTE );
    projTexture->setFilter( osg::Texture::MIN_FILTER, _mipmapping? osg::Texture::LINEAR_MIPMAP_LINEAR: osg::Texture::LINEAR );
    projTexture->setFilter( osg::Texture::MAG_FILTER, osg::Texture::LINEAR );
    projTexture->setWrap( osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_BORDER );
    projTexture->setWrap( osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_BORDER );
    //projTexture->setWrap( osg::Texture::WRAP_R, osg::Texture::CLAMP_TO_EDGE );
    projTexture->setBorderColor( osg::Vec4(0,0,0,0) );

    // set up the RTT camera:
    params._rttCamera = new osg::Camera();
    params._rttCamera->setClearColor( osg::Vec4f(0,0,0,0) );
    // this ref frame causes the RTT to inherit its viewpoint from above (in order to properly
    // process PagedLOD's etc. -- it doesn't affect the perspective of the RTT camera though)
    params._rttCamera->setReferenceFrame( osg::Camera::ABSOLUTE_RF_INHERIT_VIEWPOINT );
    params._rttCamera->setViewport( 0, 0, *_textureSize, *_textureSize );
    params._rttCamera->setComputeNearFarMode( osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR );
    params._rttCamera->setRenderOrder( osg::Camera::PRE_RENDER );
    params._rttCamera->setRenderTargetImplementation( osg::Camera::FRAME_BUFFER_OBJECT );
    params._rttCamera->setImplicitBufferAttachmentMask(0, 0);
    params._rttCamera->attach( osg::Camera::COLOR_BUFFER0, projTexture, 0, 0, _mipmapping );

    if ( _attachStencil )
    {
        OE_INFO << LC << "Attaching a stencil buffer to the RTT camera" << std::endl;

        // try a depth-packed buffer. failing that, try a normal one.. if the FBO doesn't support
        // that (which is doesn't on some GPUs like Intel), it will automatically fall back on 
        // a PBUFFER_RTT impl
        if ( Registry::capabilities().supportsDepthPackedStencilBuffer() )
        {
#ifdef OSG_GLES2_AVAILABLE 
            params._rttCamera->attach( osg::Camera::PACKED_DEPTH_STENCIL_BUFFER, GL_DEPTH24_STENCIL8_EXT );
#else
            params._rttCamera->attach( osg::Camera::PACKED_DEPTH_STENCIL_BUFFER, GL_DEPTH_STENCIL_EXT );
#endif
        }
        else
        {
            params._rttCamera->attach( osg::Camera::STENCIL_BUFFER, GL_STENCIL_INDEX );
        }

        params._rttCamera->setClearStencil( 0 );
        params._rttCamera->setClearMask( GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT ); //GL_DEPTH_BUFFER_BIT |  );
    }
    else
    {
        params._rttCamera->setClearMask( GL_COLOR_BUFFER_BIT ); //| GL_DEPTH_BUFFER_BIT );
    }

    // set up a StateSet for the RTT camera.
    osg::StateSet* rttStateSet = params._rttCamera->getOrCreateStateSet();

    // lighting is off. We don't want draped items to be lit.
    rttStateSet->setMode( GL_LIGHTING, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED );

    // install a new default shader program that replaces anything from above.
    VirtualProgram* rtt_vp = VirtualProgram::getOrCreate(rttStateSet);
    rtt_vp->setName( "DrapingTechnique RTT" );
    rtt_vp->setInheritShaders( false );
    
    // activate blending within the RTT camera's FBO
    if ( _rttBlending )
    {
        //Setup a separate blend function for the alpha components and the RGB components.  
        //Because the destination alpha is initialized to 0 instead of 1
        osg::BlendFunc* blendFunc = 0;        
        if (Registry::capabilities().supportsGLSL(140u))
        {
            //Blend Func Separate is only available on OpenGL 1.4 and above
            blendFunc = new osg::BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
        }
        else
        {
            blendFunc = new osg::BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        }

        rttStateSet->setAttributeAndModes(blendFunc, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
    }
    else
    {
        rttStateSet->setMode(GL_BLEND, osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE);
    }

    // attach the overlay group to the camera. 
    // TODO: we should probably lock this since other cull traversals might be accessing the group
    //       while we are changing its children.
    params._rttCamera->addChild( params._group );

    // overlay geometry is rendered with no depth testing, and in the order it's found in the
    // scene graph... until further notice.
    rttStateSet->setMode(GL_DEPTH_TEST, 0);
    rttStateSet->setBinName( "TraversalOrderBin" );

    // add to the terrain stateset, i.e. the stateset that the OverlayDecorator will
    // apply to the terrain before cull-traversing it. This will activate the projective
    // texturing on the terrain.
    params._terrainStateSet->setTextureAttributeAndModes( *_textureUnit, projTexture, osg::StateAttribute::ON );

    // fire up the local per-view data:
    LocalPerViewData* local = new LocalPerViewData();
    params._techniqueData = local;
    

    // Assemble the terrain shaders that will apply projective texturing.
    VirtualProgram* terrain_vp = VirtualProgram::getOrCreate(params._terrainStateSet);
    terrain_vp->setName( "DrapingTechnique terrain shaders");

    // sampler for projected texture:
    params._terrainStateSet->getOrCreateUniform(
        "oe_overlay_tex", osg::Uniform::SAMPLER_2D )->set( *_textureUnit );

    // the texture projection matrix uniform.
    local->_texGenUniform = params._terrainStateSet->getOrCreateUniform(
        "oe_overlay_texmatrix", osg::Uniform::FLOAT_MAT4 );

    // shaders
    Shaders pkg;
    pkg.loadFunction( terrain_vp, pkg.DrapingVertex );
    pkg.loadFunction( terrain_vp, pkg.DrapingFragment );
}