FGFS-4.1/OpenSceneGraph
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Preliminary work on TransferFunction support

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This commit is contained in:
Robert Osfield
2007-04-03 15:39:05 +00:00
parent 1032bc66b2
commit 31d9f40a2f
2 changed files with 66 additions and 1 deletions
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6
include/osg/TransferFunction
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@@ -56,6 +56,12 @@ class OSG_EXPORT TransferFunction1D : public osg::TransferFunction
TransferFunction1D();
void setInputRange(float minimum, float maximum);
void setMinimum(float value) { _minimum = value; }
float getMinimum() const { return _minimum; }
void setMaximum(float value) { _maximum = value; }
float getMaximum() const { return _maximum; }
void allocate(unsigned int numX);

61
src/osgTerrain/GeometryTechnique.cpp
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@@ -16,8 +16,13 @@
#include <osgUtil/SmoothingVisitor>
#include <osgDB/FileUtils>
#include <osg/io_utils>
#include <osg/Texture2D>
#include <osg/Texture1D>
#include <osg/TexEnvCombine>
#include <osg/Program>
using namespace osgTerrain;
@@ -213,7 +218,61 @@ void GeometryTechnique::init()
{
osg::Image* image = imageLayer->getImage();
osg::StateSet* stateset = _geode->getOrCreateStateSet();
stateset->setTextureAttributeAndModes(0, new osg::Texture2D(image), osg::StateAttribute::ON);
osg::Texture2D* texture2D = new osg::Texture2D;
texture2D->setImage(image);
texture2D->setResizeNonPowerOfTwoHint(false);
stateset->setTextureAttributeAndModes(0, texture2D, osg::StateAttribute::ON);
}
osg::TransferFunction1D* tf = dynamic_cast<osg::TransferFunction1D*>(colorTF);
if (tf)
{
osg::notify(osg::NOTICE)<<"Requires TransferFunction"<<std::endl;
osg::Image* image = tf->getImage();
osg::StateSet* stateset = _geode->getOrCreateStateSet();
osg::Texture1D* texture1D = new osg::Texture1D;
texture1D->setImage(image);
texture1D->setResizeNonPowerOfTwoHint(false);
texture1D->setFilter(osg::Texture::MIN_FILTER, osg::Texture::NEAREST);
texture1D->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
stateset->setTextureAttributeAndModes(1, texture1D, osg::StateAttribute::ON);
osg::Program* program = new osg::Program;
stateset->setAttribute(program);
// get shaders from source
std::string vertexShaderFile = osgDB::findDataFile("lookup.vert");
if (!vertexShaderFile.empty())
{
program->addShader(osg::Shader::readShaderFile(osg::Shader::VERTEX, vertexShaderFile));
}
else
{
osg::notify(osg::NOTICE)<<"Not found lookup.vert"<<std::endl;
}
std::string fragmentShaderFile = osgDB::findDataFile("lookup.frag");
if (!fragmentShaderFile.empty())
{
program->addShader(osg::Shader::readShaderFile(osg::Shader::FRAGMENT, fragmentShaderFile));
}
else
{
osg::notify(osg::NOTICE)<<"Not found lookup.frag"<<std::endl;
}
osg::Uniform* sourceSampler = new osg::Uniform("sourceTexture",0);
stateset->addUniform(sourceSampler);
osg::Uniform* lookupTexture = new osg::Uniform("lookupTexture",1);
stateset->addUniform(lookupTexture);
osg::Uniform* minValue = new osg::Uniform("minValue", tf->getMinimum());
stateset->addUniform(minValue);
osg::Uniform* inverseRange = new osg::Uniform("inverseRange", 1.0f/(tf->getMaximum()-tf->getMinimum()));
stateset->addUniform(inverseRange);
}
}