New osgvertexattributes example designed to test conversion of fixed function scene graphs to use vertex shaders
and vertex attributes.
This commit is contained in:
Robert Osfield
parent
58b3fe2664
commit
3f55f3f140
@ -112,6 +112,7 @@ IF(DYNAMIC_OPENSCENEGRAPH)
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ADD_SUBDIRECTORY(osgthirdpersonview)
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ADD_SUBDIRECTORY(osgthirdpersonview)
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ADD_SUBDIRECTORY(osgunittests)
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ADD_SUBDIRECTORY(osgunittests)
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ADD_SUBDIRECTORY(osgvertexprogram)
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ADD_SUBDIRECTORY(osgvertexprogram)
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ADD_SUBDIRECTORY(osgvertexattributes)
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ADD_SUBDIRECTORY(osgvolume)
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ADD_SUBDIRECTORY(osgvolume)
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ADD_SUBDIRECTORY(osgwindows)
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ADD_SUBDIRECTORY(osgwindows)
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ADD_SUBDIRECTORY(osganimationtimeline)
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ADD_SUBDIRECTORY(osganimationtimeline)
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4
examples/osgvertexattributes/CMakeLists.txt
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4
examples/osgvertexattributes/CMakeLists.txt
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SET(TARGET_SRC osgvertexattributes.cpp )
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#### end var setup ###
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SETUP_EXAMPLE(osgvertexattributes)
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185
examples/osgvertexattributes/osgvertexattributes.cpp
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185
examples/osgvertexattributes/osgvertexattributes.cpp
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/* OpenSceneGraph example, osgvertexattributes.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <osgUtil/ShaderGen>
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#include <osgDB/ReadFile>
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#include <osgDB/WriteFile>
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#include <osgViewer/Viewer>
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class ConvertToVertexAttibArrays : public osg::NodeVisitor
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{
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public:
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typedef std::pair<unsigned int, std::string> AttributeAlias;
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ConvertToVertexAttibArrays():
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osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
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{
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// mappings taken from http://www.opengl.org/registry/specs/NV/vertex_program.txt
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_vertexAlias = AttributeAlias(0, "osg_Vertex");
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_normalAlias = AttributeAlias(2, "osg_Normal");
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_colorAlias = AttributeAlias(3, "osg_Color");
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_secondaryColorAlias = AttributeAlias(4, "osg_SecondaryColor");
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_fogCoordAlias = AttributeAlias(5, "osg_FogCoord");
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_texCoordAlias[0] = AttributeAlias(8, "osg_MultiTexCoord0");
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_texCoordAlias[1] = AttributeAlias(9, "osg_MultiTexCoord1");
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_texCoordAlias[2] = AttributeAlias(10, "osg_MultiTexCoord2");
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_texCoordAlias[3] = AttributeAlias(11, "osg_MultiTexCoord3");
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_texCoordAlias[4] = AttributeAlias(12, "osg_MultiTexCoord4");
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_texCoordAlias[5] = AttributeAlias(13, "osg_MultiTexCoord5");
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_texCoordAlias[6] = AttributeAlias(14, "osg_MultiTexCoord6");
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_texCoordAlias[7] = AttributeAlias(15, "osg_MultiTexCoord7");
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}
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void apply(osg::Geode& geode)
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{
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for(unsigned int i=0; i<geode.getNumDrawables(); ++i)
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{
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osg::Geometry* geom = geode.getDrawable(i)->asGeometry();
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if (geom) apply(*geom);
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}
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}
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void apply(osg::Geometry& geom)
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{
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osg::notify(osg::NOTICE)<<"Found geometry "<<&geom<<std::endl;
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if (geom.getVertexArray())
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{
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setVertexAttrib(geom, _vertexAlias, geom.getVertexArray(), false, osg::Geometry::BIND_PER_VERTEX);
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geom.setVertexArray(0);
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}
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if (geom.getNormalArray())
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{
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setVertexAttrib(geom, _normalAlias, geom.getNormalArray(), true, geom.getNormalBinding());
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geom.setNormalArray(0);
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}
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if (geom.getColorArray())
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{
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setVertexAttrib(geom, _colorAlias, geom.getColorArray(), true, geom.getColorBinding());
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geom.setColorArray(0);
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}
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if (geom.getSecondaryColorArray())
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{
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setVertexAttrib(geom, _secondaryColorAlias, geom.getSecondaryColorArray(), true, geom.getSecondaryColorBinding());
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geom.setSecondaryColorArray(0);
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}
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if (geom.getFogCoordArray())
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{
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// should we normalize the FogCoord array? Don't think so...
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setVertexAttrib(geom, _fogCoordAlias, geom.getFogCoordArray(), false, geom.getSecondaryColorBinding());
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geom.setFogCoordArray(0);
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}
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unsigned int maxNumTexCoords = geom.getNumTexCoordArrays();
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if (maxNumTexCoords>8)
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{
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osg::notify(osg::NOTICE)<<"Warning: Ignoring "<<maxNumTexCoords-8<<" texture coordinate arrays, only 8 are currently supported in vertex attribute conversion code."<<std::endl;
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maxNumTexCoords = 8;
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}
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for(unsigned int i=0; i<maxNumTexCoords; ++i)
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{
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if (geom.getTexCoordArray(i))
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{
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setVertexAttrib(geom, _texCoordAlias[i], geom.getTexCoordArray(i), true, geom.getSecondaryColorBinding());
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geom.setTexCoordArray(i,0);
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}
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else
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{
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osg::notify(osg::NOTICE)<<"Found empty TexCoordArray("<<i<<")"<<std::endl;
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}
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}
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}
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void setVertexAttrib(osg::Geometry& geom, const AttributeAlias& alias, osg::Array* array, bool normalize, osg::Geometry::AttributeBinding binding)
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{
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unsigned int index = alias.first;
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const std::string& name = alias.second;
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array->setName(name);
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geom.setVertexAttribArray(index, array);
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geom.setVertexAttribNormalize(index, normalize);
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geom.setVertexAttribBinding(index, binding);
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osg::notify(osg::NOTICE)<<" vertex attrib("<<name<<", index="<<index<<", normalize="<<normalize<<" binding="<<binding<<")"<<std::endl;
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}
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AttributeAlias _vertexAlias;
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AttributeAlias _normalAlias;
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AttributeAlias _colorAlias;
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AttributeAlias _secondaryColorAlias;
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AttributeAlias _fogCoordAlias;
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AttributeAlias _texCoordAlias[8];
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};
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int main(int argc, char *argv[])
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{
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// use an ArgumentParser object to manage the program arguments.
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osg::ArgumentParser arguments(&argc,argv);
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// construct the viewer.
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osgViewer::Viewer viewer(arguments);
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std::string outputFileName;
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while (arguments.read("-o",outputFileName)) {}
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bool runShaderGen = true;
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while (arguments.read("--shader-gen")) { runShaderGen = true; }
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while (arguments.read("--no-shader-gen")) { runShaderGen = false; }
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bool runConvertToVertexAttributes = true;
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while (arguments.read("--vertex-attrib")) { runConvertToVertexAttributes = true; }
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while (arguments.read("--no-vertex-attrib")) { runConvertToVertexAttributes = false; }
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osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
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if (!loadedModel.get())
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{
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osg::notify(osg::NOTICE)<<"No model loaded, please specify a model filename."<<std::endl;
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return 1;
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}
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if (runShaderGen)
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{
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// convert fixed function pipeline to shaders
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osgUtil::ShaderGenVisitor sgv;
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loadedModel->accept(sgv);
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}
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if (runConvertToVertexAttributes)
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{
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// find any conventional vertex, colour, normal and tex coords arrays and convert to vertex attributes
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ConvertToVertexAttibArrays ctvaa;
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loadedModel->accept(ctvaa);
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}
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if (!outputFileName.empty())
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{
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osgDB::writeNodeFile(*loadedModel, outputFileName);
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return 0;
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}
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// add a viewport to the viewer and attach the scene graph.
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viewer.setSceneData(loadedModel.get());
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return viewer.run();
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}
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