FGFS-4.1/OpenSceneGraph
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Added preliminary GLSL shader path for volume rendering.

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This commit is contained in:
Robert Osfield
2005-09-05 07:48:55 +00:00
parent 14980872a7
commit 7ed8bab8d4
1 changed files with 76 additions and 6 deletions
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82
examples/osgvolume/osgvolume.cpp
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@@ -17,6 +17,7 @@
#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>
#include <osgDB/FileUtils>
#include <osgDB/FileNameUtils>
#include <osgUtil/CullVisitor>
@@ -638,6 +639,60 @@ osg::Node* createCube(float size,float alpha, unsigned int numSlices, float slic
return billboard;
}
osg::Node* createShaderModel(osg::ref_ptr<osg::Image>& image_3d, osg::ref_ptr<osg::Image>& normalmap_3d,
osg::Texture::InternalFormatMode internalFormatMode,
float xSize, float ySize, float zSize,
float xMultiplier, float yMultiplier, float zMultiplier,
unsigned int numSlices=500, float sliceEnd=1.0f, float alphaFuncValue=0.02f)
{
osg::Geode* geode = new osg::Geode;
osg::StateSet* stateset = geode->getOrCreateStateSet();
// set up the 3d texture itself,
// note, well set the filtering up so that mip mapping is disabled,
// gluBuild3DMipsmaps doesn't do a very good job of handled the
// inbalanced dimensions of the 256x256x4 texture.
osg::Texture3D* texture3D = new osg::Texture3D;
texture3D->setFilter(osg::Texture3D::MIN_FILTER,osg::Texture3D::LINEAR);
texture3D->setFilter(osg::Texture3D::MAG_FILTER,osg::Texture3D::LINEAR);
texture3D->setWrap(osg::Texture3D::WRAP_R,osg::Texture3D::CLAMP);
texture3D->setWrap(osg::Texture3D::WRAP_S,osg::Texture3D::CLAMP);
texture3D->setWrap(osg::Texture3D::WRAP_T,osg::Texture3D::CLAMP);
if (image_3d->getPixelFormat()==GL_ALPHA ||
image_3d->getPixelFormat()==GL_LUMINANCE)
{
texture3D->setInternalFormatMode(osg::Texture3D::USE_USER_DEFINED_FORMAT);
texture3D->setInternalFormat(GL_INTENSITY);
}
else
{
texture3D->setInternalFormatMode(internalFormatMode);
}
texture3D->setImage(image_3d.get());
stateset->setTextureAttributeAndModes(0,texture3D,osg::StateAttribute::ON);
osg::Program* program = new osg::Program;
stateset->setAttribute(program);
// get shaders from source
program->addShader(osg::Shader::readShaderFile(osg::Shader::VERTEX, osgDB::findDataFile("volume.vert")));
program->addShader(osg::Shader::readShaderFile(osg::Shader::FRAGMENT, osgDB::findDataFile("volume.frag")));
osg::Uniform* baseTextureSampler = new osg::Uniform("baseTexture",0);
stateset->addUniform(baseTextureSampler);
osg::Uniform* deltaTexCoord = new osg::Uniform("deltaTexCoord",osg::Vec3(0.0f,0.0f,1.0f/256.0f));
stateset->addUniform(deltaTexCoord);
{
geode->addDrawable(osg::createTexturedQuadGeometry(osg::Vec3(0,0,0),osg::Vec3(1.0,0.0,0.0),osg::Vec3(0.0,1.0,0.0)));
}
return geode;
}
osg::Node* createModel(osg::ref_ptr<osg::Image>& image_3d, osg::ref_ptr<osg::Image>& normalmap_3d,
osg::Texture::InternalFormatMode internalFormatMode,
float xSize, float ySize, float zSize,
@@ -1229,6 +1284,8 @@ int main( int argc, char **argv )
unsigned int numComponentsDesired = 0;
while(arguments.read("--num-components", numComponentsDesired)) {}
bool useShader = false;
while(arguments.read("--shader")) { useShader = true; }
osg::ref_ptr<osg::Image> image_3d;
@@ -1291,12 +1348,25 @@ int main( int argc, char **argv )
// create a model from the images.
osg::Node* rootNode = createModel(image_3d, normalmap_3d,
internalFormatMode,
xSize, ySize, zSize,
xMultiplier, yMultiplier, zMultiplier,
numSlices, sliceEnd, alphaFunc);
osg::Node* rootNode = 0;
if (useShader)
{
rootNode = createShaderModel(image_3d, normalmap_3d,
internalFormatMode,
xSize, ySize, zSize,
xMultiplier, yMultiplier, zMultiplier,
numSlices, sliceEnd, alphaFunc);
}
else
{
rootNode = createModel(image_3d, normalmap_3d,
internalFormatMode,
xSize, ySize, zSize,
xMultiplier, yMultiplier, zMultiplier,
numSlices, sliceEnd, alphaFunc);
}
if (!outputFile.empty())
{
std::string ext = osgDB::getFileExtension(outputFile);