DrawTileCommand*
TerrainCuller::addDrawCommand(UID uid, const TileRenderModel* model, const RenderingPass* pass, TileNode* tileNode)
{
SurfaceNode* surface = tileNode->getSurfaceNode();
const RenderBindings& bindings = _context->getRenderBindings();
// skip layers that are not visible:
if (pass && pass->_imageLayer.valid() && !pass->_imageLayer->getVisible())
return 0L;
// add a new Draw command to the appropriate layer
osg::ref_ptr<LayerDrawable> layer = _terrain.layer(uid);
if (layer.valid())
{
layer->_tiles.push_back(DrawTileCommand());
DrawTileCommand& tile = layer->_tiles.back();
// install everything we need in the Draw Command:
tile._colorSamplers = pass ? &pass->_samplers : 0L;
tile._sharedSamplers = &model->_sharedSamplers;
tile._matrix = surface->getMatrix();
tile._modelViewMatrix = *this->getModelViewMatrix();
tile._keyValue = tileNode->getTileKeyValue();
tile._geom = surface->getDrawable()->_geom.get();
tile._morphConstants = tileNode->getMorphConstants();
tile._key = tileNode->getKey();
#if 1
osg::Vec3 c = surface->getBound().center() * surface->getInverseMatrix();
tile._range = getDistanceToViewPoint(c, true);
#else
osg::Vec3f eyeWorld = getViewPointLocal() * surface->getMatrix();
tile._range = (eyeWorld - surface->getBound().center()).length();
#endif
const osg::Image* elevRaster = tileNode->getElevationRaster();
if (elevRaster)
{
float bias = _context->getUseTextureBorder() ? 1.5 : 0.5;
// Compute an elevation texture sampling scale/bias so we sample elevation data on center
// instead of on edge (as we do with color, etc.)
//
// This starts out as:
// scale = (size-1)/size : this shrinks the sample area by one texel since we're sampling on center
// bias = 0.5/size : this shifts the sample area over 1/2 texel to the center.
//
// But, since we also have a 1-texel border, we need to further reduce the scale by 2 texels to
// remove the border, and shift an extra texel over as well. Giving us this:
float size = (float)elevRaster->s();
tile._elevTexelCoeff.set((size - (2.0*bias)) / size, bias / size);
}
return &tile;
}
else if (pass)
{
// The pass exists but it's layer doesn't - remember this so we can run
// a visitor to clean up the rendering models.
++_orphanedPassesDetected;
}
return 0L;
}
DrawTileCommand*
TerrainCuller::addDrawCommand(UID uid, const TileRenderModel* model, const RenderingPass* pass, TileNode* tileNode)
{
SurfaceNode* surface = tileNode->getSurfaceNode();
const RenderBindings& bindings = _context->getRenderBindings();
// skip layers that are not visible:
if (pass &&
pass->visibleLayer() &&
pass->visibleLayer()->getVisible() == false)
{
//OE_DEBUG << LC << "Skipping " << pass->visibleLayer()->getName() << " because it's not visible." << std::endl;
return 0L;
}
// add a new Draw command to the appropriate layer
osg::ref_ptr<LayerDrawable> drawable = _terrain.layer(uid);
if (drawable.valid())
{
// Layer marked for drawing?
if (drawable->_draw)
{
// Cull based on the layer extent.
if (drawable->_layer)
{
const LayerExtent& le = (*_layerExtents)[drawable->_layer->getUID()];
if (le._computed &&
le._extent.isValid() &&
le._extent.intersects(tileNode->getKey().getExtent()) == false)
{
// culled out!
//OE_DEBUG << LC << "Skippping " << drawable->_layer->getName()
// << " key " << tileNode->getKey().str()
// << " because it was culled by extent." << std::endl;
return 0L;
}
}
drawable->_tiles.push_back(DrawTileCommand());
DrawTileCommand* tile = &drawable->_tiles.back();
// install everything we need in the Draw Command:
tile->_colorSamplers = pass ? &(pass->samplers()) : 0L;
tile->_sharedSamplers = &model->_sharedSamplers;
tile->_modelViewMatrix = this->getModelViewMatrix();
tile->_keyValue = tileNode->getTileKeyValue();
tile->_geom = surface->getDrawable()->_geom.get();
tile->_morphConstants = tileNode->getMorphConstants();
tile->_key = &tileNode->getKey();
tile->_order = drawable->_order; // layer order in map tile.
osg::Vec3 c = surface->getBound().center() * surface->getInverseMatrix();
tile->_range = getDistanceToViewPoint(c, true);
const osg::Image* elevRaster = tileNode->getElevationRaster();
if (elevRaster)
{
float bias = _context->getUseTextureBorder() ? 1.5 : 0.5;
// Compute an elevation texture sampling scale/bias so we sample elevation data on center
// instead of on edge (as we do with color, etc.)
//
// This starts out as:
// scale = (size-1)/size : this shrinks the sample area by one texel since we're sampling on center
// bias = 0.5/size : this shifts the sample area over 1/2 texel to the center.
//
// But, since we also have a 1-texel border, we need to further reduce the scale by 2 texels to
// remove the border, and shift an extra texel over as well. Giving us this:
float size = (float)elevRaster->s();
tile->_elevTexelCoeff.set((size - (2.0*bias)) / size, bias / size);
}
return tile;
}
}
else if (pass)
{
// The pass exists but it's layer is not in the render data draw list.
// This means that the layer is no longer in the map. Detect and record
// this information so we can run a cleanup visitor later on.
++_orphanedPassesDetected;
}
return 0L;
}
