FGFS-4.1/OpenSceneGraph
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Added automatic detection of alpha values, switching on blending when alpah!=1.0

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This commit is contained in:
Robert Osfield
2007-05-10 12:49:09 +00:00
parent bd194693dd
commit 3fd26eec28
1 changed files with 17 additions and 1 deletions
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18
src/osgTerrain/GeometryTechnique.cpp
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@@ -348,6 +348,8 @@ void GeometryTechnique::init()
}
}
bool containsTransparency = false;
if (colorLayer)
{
osgTerrain::ImageLayer* imageLayer = dynamic_cast<osgTerrain::ImageLayer*>(colorLayer);
@@ -362,17 +364,22 @@ void GeometryTechnique::init()
stateset->setTextureAttributeAndModes(color_index, texture2D, osg::StateAttribute::ON);
texture2D->setFilter(osg::Texture::MAG_FILTER, filter==TerrainNode::LINEAR ? osg::Texture::LINEAR : osg::Texture::NEAREST);
if (tf)
{
// up the precision of hte internal texture format to its maximum.
//image->setInternalTextureFormat(GL_LUMINANCE32F_ARB);
image->setInternalTextureFormat(GL_LUMINANCE16);
}
else
{
containsTransparency = image->isImageTranslucent();
}
}
}
if (tf)
{
osg::notify(osg::NOTICE)<<"Requires TransferFunction"<<std::endl;
@@ -385,6 +392,8 @@ void GeometryTechnique::init()
texture1D->setFilter(osg::Texture::MAG_FILTER, osg::Texture::NEAREST);
stateset->setTextureAttributeAndModes(tf_index, texture1D, osg::StateAttribute::ON);
containsTransparency = image->isImageTranslucent();
if (colorLayer)
{
osg::notify(osg::NOTICE)<<"Using fragment program"<<std::endl;
@@ -430,6 +439,13 @@ void GeometryTechnique::init()
osg::notify(osg::NOTICE)<<"Using standard OpenGL fixed function pipeline"<<std::endl;
}
}
if (containsTransparency)
{
osg::StateSet* stateset = _geode->getOrCreateStateSet();
stateset->setMode(GL_BLEND, osg::StateAttribute::ON);
stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
}
// if (_terrainGeometry.valid()) _terrainGeometry->setUseDisplayList(false);
if (_geometry.valid()) _geometry->setUseVertexBufferObjects(true);