Exemplo n.º 1
0
bool
ExtrudeGeometryFilter::buildWallGeometry(const Structure&     structure,
                                         osg::Geometry*       walls,
                                         const osg::Vec4&     wallColor,
                                         const osg::Vec4&     wallBaseColor,
                                         const SkinResource*  wallSkin)
{
    bool madeGeom = true;

    // 6 verts per face total (3 triangles)
    unsigned numWallVerts = 6 * structure.getNumPoints();

    double texWidthM   = wallSkin ? *wallSkin->imageWidth()  : 1.0;
    double texHeightM  = wallSkin ? *wallSkin->imageHeight() : 1.0;
    bool   useColor    = (!wallSkin || wallSkin->texEnvMode() != osg::TexEnv::DECAL) && !_makeStencilVolume;
    
    // Scale and bias:
    osg::Vec2f scale, bias;
    float layer;
    if ( wallSkin )
    {
        bias.set (wallSkin->imageBiasS().get(),  wallSkin->imageBiasT().get());
        scale.set(wallSkin->imageScaleS().get(), wallSkin->imageScaleT().get());
        layer = (float)wallSkin->imageLayer().get();
    }

    // create all the OSG geometry components
    osg::Vec3Array* verts = new osg::Vec3Array( numWallVerts );
    walls->setVertexArray( verts );
    
    osg::Vec3Array* tex = 0L;
    if ( wallSkin )
    { 
        tex = new osg::Vec3Array( numWallVerts );
        walls->setTexCoordArray( 0, tex );
    }

    osg::Vec4Array* colors = 0L;
    if ( useColor )
    {
        // per-vertex colors are necessary if we are going to use the MeshConsolidator -gw
        colors = new osg::Vec4Array( numWallVerts );
        walls->setColorArray( colors );
        walls->setColorBinding( osg::Geometry::BIND_PER_VERTEX );
    }

    unsigned vertptr = 0;
    bool     tex_repeats_y = wallSkin && wallSkin->isTiled() == true;

    for(Elevations::const_iterator elev = structure.elevations.begin(); elev != structure.elevations.end(); ++elev)
    {
        osg::DrawElements* de = 
            numWallVerts > 0xFFFF ? (osg::DrawElements*) new osg::DrawElementsUInt  ( GL_TRIANGLES ) :
            numWallVerts > 0xFF   ? (osg::DrawElements*) new osg::DrawElementsUShort( GL_TRIANGLES ) :
                                    (osg::DrawElements*) new osg::DrawElementsUByte ( GL_TRIANGLES );

        // pre-allocate for speed
        de->reserveElements( numWallVerts );

        walls->addPrimitiveSet( de );

        for(Faces::const_iterator f = elev->faces.begin(); f != elev->faces.end(); ++f, vertptr+=6)
        {
            // set the 6 wall verts.
            (*verts)[vertptr+0] = f->left.roof;
            (*verts)[vertptr+1] = f->left.base;
            (*verts)[vertptr+2] = f->right.base;
            (*verts)[vertptr+3] = f->right.base;
            (*verts)[vertptr+4] = f->right.roof;
            (*verts)[vertptr+5] = f->left.roof;

            // Assign wall polygon colors.
            if (useColor)
            {
#if 0
                // experimental: apply some ambient occlusion to tight inside corners                
                float bL = f->left.cosAngle > 0.0 ? 1.0 : (1.0+f->left.cosAngle);
                float bR = f->right.cosAngle > 0.0 ? 1.0 : (1.0+f->right.cosAngle);

                osg::Vec4f leftColor      = Color(wallColor).brightness(bL);
                osg::Vec4f leftBaseColor  = Color(wallBaseColor).brightness(bL);
                osg::Vec4f rightColor     = Color(wallColor).brightness(bR);
                osg::Vec4f rightBaseColor = Color(wallBaseColor).brightness(bR);

                (*colors)[vertptr+0] = leftColor;
                (*colors)[vertptr+1] = leftBaseColor;
                (*colors)[vertptr+2] = rightBaseColor;
                (*colors)[vertptr+3] = rightBaseColor;
                (*colors)[vertptr+4] = rightColor;
                (*colors)[vertptr+5] = leftColor;
#else
                (*colors)[vertptr+0] = wallColor;
                (*colors)[vertptr+1] = wallBaseColor;
                (*colors)[vertptr+2] = wallBaseColor;
                (*colors)[vertptr+3] = wallBaseColor;
                (*colors)[vertptr+4] = wallColor;
                (*colors)[vertptr+5] = wallColor;
#endif
            }

            // Calculate texture coordinates:
            if (wallSkin)
            {
                // Calculate left and right corner V coordinates:
                double hL = tex_repeats_y ? (f->left.roof - f->left.base).length()   : elev->texHeightAdjustedM;
                double hR = tex_repeats_y ? (f->right.roof - f->right.base).length() : elev->texHeightAdjustedM;
                
                // Calculate the texture coordinates at each corner. The structure builder
                // will have spaced the verts correctly for this to work.
                float uL = fmod( f->left.offsetX, texWidthM ) / texWidthM;
                float uR = fmod( f->right.offsetX, texWidthM ) / texWidthM;

                // Correct for the case in which the rightmost corner is exactly on a
                // texture boundary.
                if ( uR < uL || (uL == 0.0 && uR == 0.0))
                    uR = 1.0f;

                osg::Vec2f texBaseL( uL, 0.0f );
                osg::Vec2f texBaseR( uR, 0.0f );
                osg::Vec2f texRoofL( uL, hL/elev->texHeightAdjustedM );
                osg::Vec2f texRoofR( uR, hR/elev->texHeightAdjustedM );

                texRoofL = bias + osg::componentMultiply(texRoofL, scale);
                texRoofR = bias + osg::componentMultiply(texRoofR, scale);
                texBaseL = bias + osg::componentMultiply(texBaseL, scale);
                texBaseR = bias + osg::componentMultiply(texBaseR, scale);

                (*tex)[vertptr+0].set( texRoofL.x(), texRoofL.y(), layer );
                (*tex)[vertptr+1].set( texBaseL.x(), texBaseL.y(), layer );
                (*tex)[vertptr+2].set( texBaseR.x(), texBaseR.y(), layer );
                (*tex)[vertptr+3].set( texBaseR.x(), texBaseR.y(), layer );
                (*tex)[vertptr+4].set( texRoofR.x(), texRoofR.y(), layer );
                (*tex)[vertptr+5].set( texRoofL.x(), texRoofL.y(), layer );
            }

            for(int i=0; i<6; ++i)
                de->addElement( vertptr+i );
        }
    }
    
    // generate per-vertex normals, altering the geometry as necessary to avoid
    // smoothing around sharp corners

    // TODO: reconsider this, given the new Structure setup
    // it won't actual smooth corners since we don't have shared edges.
    osgUtil::SmoothingVisitor::smooth(
        *walls,
        osg::DegreesToRadians(_wallAngleThresh_deg) );

    return madeGeom;
}
bool
ExtrudeGeometryFilter::buildWallGeometry(const Structure&     structure,
                                         osg::Geometry*       walls,
                                         const osg::Vec4&     wallColor,
                                         const osg::Vec4&     wallBaseColor,
                                         const SkinResource*  wallSkin)
{
    bool madeGeom = true;

    // 6 verts per face total (3 triangles)
    unsigned numWallVerts = 6 * structure.getNumPoints();

    double texWidthM   = wallSkin ? *wallSkin->imageWidth()  : 1.0;
    double texHeightM  = wallSkin ? *wallSkin->imageHeight() : 1.0;
    bool   useColor    = (!wallSkin || wallSkin->texEnvMode() != osg::TexEnv::DECAL) && !_makeStencilVolume;
    
    // Scale and bias:
    osg::Vec2f scale, bias;
    float layer;
    if ( wallSkin )
    {
        bias.set (wallSkin->imageBiasS().get(),  wallSkin->imageBiasT().get());
        scale.set(wallSkin->imageScaleS().get(), wallSkin->imageScaleT().get());
        layer = (float)wallSkin->imageLayer().get();
    }

    // create all the OSG geometry components
    osg::Vec3Array* verts = new osg::Vec3Array( numWallVerts );
    walls->setVertexArray( verts );
    
    osg::Vec3Array* tex = 0L;
    if ( wallSkin )
    { 
        tex = new osg::Vec3Array( numWallVerts );
        walls->setTexCoordArray( 0, tex );
    }

    osg::Vec4Array* colors = 0L;
    if ( useColor )
    {
        colors = new osg::Vec4Array( osg::Array::BIND_PER_VERTEX, numWallVerts );
        walls->setColorArray( colors );
    }

    osg::Vec4Array* anchors = 0L;
    
    // If GPU clamping is in effect, create clamping attributes.
    if ( _gpuClamping )
    {
        anchors = new osg::Vec4Array( osg::Array::BIND_PER_VERTEX, numWallVerts );
        anchors->setNormalize(false);
        walls->setVertexAttribArray    ( Clamping::AnchorAttrLocation, anchors );
    }

    unsigned vertptr = 0;
    bool     tex_repeats_y = wallSkin && wallSkin->isTiled() == true;

    bool flatten =
        _style.has<ExtrusionSymbol>() &&
        _style.get<ExtrusionSymbol>()->flatten() == true;

    for(Elevations::const_iterator elev = structure.elevations.begin(); elev != structure.elevations.end(); ++elev)
    {
        osg::DrawElements* de = 
            numWallVerts > 0xFFFF ? (osg::DrawElements*) new osg::DrawElementsUInt  ( GL_TRIANGLES ) :
            numWallVerts > 0xFF   ? (osg::DrawElements*) new osg::DrawElementsUShort( GL_TRIANGLES ) :
                                    (osg::DrawElements*) new osg::DrawElementsUByte ( GL_TRIANGLES );

        // pre-allocate for speed
        de->reserveElements( numWallVerts );

        walls->addPrimitiveSet( de );

        for(Faces::const_iterator f = elev->faces.begin(); f != elev->faces.end(); ++f, vertptr+=6)
        {
            // set the 6 wall verts.
            (*verts)[vertptr+0] = f->left.roof;
            (*verts)[vertptr+1] = f->left.base;
            (*verts)[vertptr+2] = f->right.base;
            (*verts)[vertptr+3] = f->right.base;
            (*verts)[vertptr+4] = f->right.roof;
            (*verts)[vertptr+5] = f->left.roof;
            
            if ( anchors )
            {
                float x = structure.baseCentroid.x(), y = structure.baseCentroid.y(), vo = structure.verticalOffset;

                (*anchors)[vertptr+1].set( x, y, vo, Clamping::ClampToGround );
                (*anchors)[vertptr+2].set( x, y, vo, Clamping::ClampToGround );
                (*anchors)[vertptr+3].set( x, y, vo, Clamping::ClampToGround );

                if ( flatten )
                {
                    (*anchors)[vertptr+0].set( x, y, vo, Clamping::ClampToAnchor );
                    (*anchors)[vertptr+4].set( x, y, vo, Clamping::ClampToAnchor );
                    (*anchors)[vertptr+5].set( x, y, vo, Clamping::ClampToAnchor );
                }
                else
                {                    
                    (*anchors)[vertptr+0].set( x, y, vo + f->left.height,  Clamping::ClampToGround );
                    (*anchors)[vertptr+4].set( x, y, vo + f->right.height, Clamping::ClampToGround );
                    (*anchors)[vertptr+5].set( x, y, vo + f->left.height,  Clamping::ClampToGround );
                }
            }

            // Assign wall polygon colors.
            if (useColor)
            {
                (*colors)[vertptr+0] = wallColor;
                (*colors)[vertptr+1] = wallBaseColor;
                (*colors)[vertptr+2] = wallBaseColor;
                (*colors)[vertptr+3] = wallBaseColor;
                (*colors)[vertptr+4] = wallColor;
                (*colors)[vertptr+5] = wallColor;
            }

            // Calculate texture coordinates:
            if (wallSkin)
            {
                // Calculate left and right corner V coordinates:
                double hL = tex_repeats_y ? (f->left.roof - f->left.base).length()   : elev->texHeightAdjustedM;
                double hR = tex_repeats_y ? (f->right.roof - f->right.base).length() : elev->texHeightAdjustedM;
                
                // Calculate the texture coordinates at each corner. The structure builder
                // will have spaced the verts correctly for this to work.
                float uL = fmod( f->left.offsetX, texWidthM ) / texWidthM;
                float uR = fmod( f->right.offsetX, texWidthM ) / texWidthM;

                // Correct for the case in which the rightmost corner is exactly on a
                // texture boundary.
                if ( uR < uL || (uL == 0.0 && uR == 0.0))
                    uR = 1.0f;

                osg::Vec2f texBaseL( uL, 0.0f );
                osg::Vec2f texBaseR( uR, 0.0f );
                osg::Vec2f texRoofL( uL, hL/elev->texHeightAdjustedM );
                osg::Vec2f texRoofR( uR, hR/elev->texHeightAdjustedM );

                texRoofL = bias + osg::componentMultiply(texRoofL, scale);
                texRoofR = bias + osg::componentMultiply(texRoofR, scale);
                texBaseL = bias + osg::componentMultiply(texBaseL, scale);
                texBaseR = bias + osg::componentMultiply(texBaseR, scale);

                (*tex)[vertptr+0].set( texRoofL.x(), texRoofL.y(), layer );
                (*tex)[vertptr+1].set( texBaseL.x(), texBaseL.y(), layer );
                (*tex)[vertptr+2].set( texBaseR.x(), texBaseR.y(), layer );
                (*tex)[vertptr+3].set( texBaseR.x(), texBaseR.y(), layer );
                (*tex)[vertptr+4].set( texRoofR.x(), texRoofR.y(), layer );
                (*tex)[vertptr+5].set( texRoofL.x(), texRoofL.y(), layer );
            }

            for(int i=0; i<6; ++i)
            {
                de->addElement( vertptr+i );
            }
        }
    }
    
    // generate per-vertex normals, altering the geometry as necessary to avoid
    // smoothing around sharp corners

    // TODO: reconsider this, given the new Structure setup
    // it won't actual smooth corners since we don't have shared edges.
    osgUtil::SmoothingVisitor::smooth(
        *walls,
        osg::DegreesToRadians(_wallAngleThresh_deg) );

    return madeGeom;
}