FGFS-4.1/OpenSceneGraph
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Added shader to convert images into greyscale when rendering in anaglyphic

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This commit is contained in:
Robert Osfield 2009-03-30 09:55:40 +00:00
parent 90f77c43d5
commit 80190a6ffb
1 changed files with 75 additions and 30 deletions
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105
examples/osgstereoimage/osgstereoimage.cpp
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@ -34,6 +34,43 @@
typedef std::vector<std::string> FileList;
#include <osg/Program>
#include <osg/Shader>
osg::StateSet* createColorToGreyscaleStateSet()
{
osg::StateSet* stateset = new osg::StateSet;
osg::Program* program = new osg::Program;
stateset->setAttribute(program);
const char* fragSource =
{
"uniform sampler2D baseTexture;\n"
"uniform mat4 colorMatrix;\n"
"void main(void)\n"
"{\n"
" vec4 color = texture2D( baseTexture, gl_TexCoord[0].st );\n"
" gl_FragColor = colorMatrix * color;\n"
"}\n"
};
program->addShader(new osg::Shader(osg::Shader::FRAGMENT, fragSource));
stateset->addUniform(new osg::Uniform("baseTexture",0));
osg::Matrixf colorMatrix(
0.3f, 0.3f, 0.3f, 0.0f,
0.59f, 0.59f, 0.59f, 0.0f,
0.11f, 0.11f, 0.11f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f
);
stateset->addUniform(new osg::Uniform("colorMatrix",colorMatrix));
return stateset;
}
osg::Geode* createSectorForImage(osg::Image* image, osg::TexMat* texmat, float s,float t, float radius, float height, float length)
{
bool flip = image->getOrigin()==osg::Image::TOP_LEFT;
@ -103,37 +140,38 @@ osg::Geode* createSectorForImage(osg::Image* image, osg::TexMat* texmat, float s
}
osg::Group * loadImages(std::string image1, std::string image2, osg::TexMat* texmatLeft, osg::TexMat* texmatRight, float radius, float height, float length) {
osg::ref_ptr<osg::Image> imageLeft = osgDB::readImageFile(image1);
osg::ref_ptr<osg::Image> imageRight = osgDB::readImageFile(image2);
if (imageLeft.valid() && imageRight.valid())
{
osg::ImageStream* streamLeft = dynamic_cast<osg::ImageStream*>(imageLeft.get());
if (streamLeft) streamLeft->play();
osg::ImageStream* streamRight = dynamic_cast<osg::ImageStream*>(imageRight.get());
if (streamRight) streamRight->play();
float average_s = (imageLeft->s()+imageRight->s())*0.5f;
float average_t = (imageLeft->t()+imageRight->t())*0.5f;
osg::Geode* geodeLeft = createSectorForImage(imageLeft.get(),texmatLeft,average_s,average_t, radius, height, length);
geodeLeft->setNodeMask(0x01);
osg::Group * loadImages(std::string image1, std::string image2, osg::TexMat* texmatLeft, osg::TexMat* texmatRight, float radius, float height, float length)
{
osg::ref_ptr<osg::Image> imageLeft = osgDB::readImageFile(image1);
osg::ref_ptr<osg::Image> imageRight = osgDB::readImageFile(image2);
if (imageLeft.valid() && imageRight.valid())
{
osg::ImageStream* streamLeft = dynamic_cast<osg::ImageStream*>(imageLeft.get());
if (streamLeft) streamLeft->play();
osg::Geode* geodeRight = createSectorForImage(imageRight.get(),texmatRight,average_s,average_t, radius, height, length);
geodeRight->setNodeMask(0x02);
osg::ImageStream* streamRight = dynamic_cast<osg::ImageStream*>(imageRight.get());
if (streamRight) streamRight->play();
osg::Group * imageGroup = new osg::Group;
imageGroup->addChild(geodeLeft);
imageGroup->addChild(geodeRight);
return imageGroup;
}
else
{
std::cout << "Warning: Unable to load both image files, '"<<image1<<"' & '"<<image2<<"', required for stereo imaging."<<std::endl;
return 0;
}
float average_s = (imageLeft->s()+imageRight->s())*0.5f;
float average_t = (imageLeft->t()+imageRight->t())*0.5f;
osg::Geode* geodeLeft = createSectorForImage(imageLeft.get(),texmatLeft,average_s,average_t, radius, height, length);
geodeLeft->setNodeMask(0x01);
osg::Geode* geodeRight = createSectorForImage(imageRight.get(),texmatRight,average_s,average_t, radius, height, length);
geodeRight->setNodeMask(0x02);
osg::Group * imageGroup = new osg::Group;
imageGroup->addChild(geodeLeft);
imageGroup->addChild(geodeRight);
return imageGroup;
}
else
{
std::cout << "Warning: Unable to load both image files, '"<<image1<<"' & '"<<image2<<"', required for stereo imaging."<<std::endl;
return 0;
}
}
// create a switch containing a set of child each containing a
@ -483,7 +521,7 @@ int main( int argc, char **argv )
// construct the viewer.
osgViewer::Viewer viewer;
osgViewer::Viewer viewer(arguments);
// register the handler to add keyboard and mouse handling.
SlideEventHandler* seh = new SlideEventHandler();
@ -581,6 +619,7 @@ int main( int argc, char **argv )
//osgDB::writeNodeFile(*rootNode,"test.osg");
viewer.getCamera()->setCullMask(0xffffffff);
viewer.getCamera()->setCullMaskLeft(0x00000001);
viewer.getCamera()->setCullMaskRight(0x00000002);
@ -588,6 +627,12 @@ int main( int argc, char **argv )
// set up the use of stereo by default.
osg::DisplaySettings::instance()->setStereo(true);
if (osg::DisplaySettings::instance()->getStereoMode()==osg::DisplaySettings::ANAGLYPHIC)
{
rootNode->setStateSet(createColorToGreyscaleStateSet());
}
// set the scene to render
viewer.setSceneData(rootNode.get());