475 lines
18 KiB
C++
475 lines
18 KiB
C++
/* OpenSceneGraph example, osgvertexattributes.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include <osgUtil/ShaderGen>
|
|
#include <osgDB/ReadFile>
|
|
#include <osgDB/WriteFile>
|
|
#include <osgViewer/Viewer>
|
|
#include <osgViewer/ViewerEventHandlers>
|
|
#include <osgGA/TrackballManipulator>
|
|
|
|
class ConvertToVertexAttibArrays : public osg::NodeVisitor
|
|
{
|
|
public:
|
|
|
|
typedef std::pair<unsigned int, std::string> AttributeAlias;
|
|
|
|
ConvertToVertexAttibArrays():
|
|
osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
|
|
{
|
|
_manualVertexAliasing = false;
|
|
|
|
// mappings taken from http://www.opengl.org/registry/specs/NV/vertex_program.txt
|
|
_vertexAlias = AttributeAlias(0, "osg_Vertex");
|
|
_normalAlias = AttributeAlias(2, "osg_Normal");
|
|
_colorAlias = AttributeAlias(3, "osg_Color");
|
|
_secondaryColorAlias = AttributeAlias(4, "osg_SecondaryColor");
|
|
_fogCoordAlias = AttributeAlias(5, "osg_FogCoord");
|
|
_texCoordAlias[0] = AttributeAlias(8, "osg_MultiTexCoord0");
|
|
_texCoordAlias[1] = AttributeAlias(9, "osg_MultiTexCoord1");
|
|
_texCoordAlias[2] = AttributeAlias(10, "osg_MultiTexCoord2");
|
|
_texCoordAlias[3] = AttributeAlias(11, "osg_MultiTexCoord3");
|
|
_texCoordAlias[4] = AttributeAlias(12, "osg_MultiTexCoord4");
|
|
_texCoordAlias[5] = AttributeAlias(13, "osg_MultiTexCoord5");
|
|
_texCoordAlias[6] = AttributeAlias(14, "osg_MultiTexCoord6");
|
|
_texCoordAlias[7] = AttributeAlias(15, "osg_MultiTexCoord7");
|
|
}
|
|
|
|
void bindAttribute(osg::Program& program, const AttributeAlias& alias)
|
|
{
|
|
program.addBindAttribLocation(alias.second, alias.first);
|
|
}
|
|
|
|
void replaceAndBindAttrib(osg::Program& program, std::string& source, const std::string& originalStr, const AttributeAlias& alias, const std::string& declarationPrefix)
|
|
{
|
|
if (replace(source, originalStr, alias.second))
|
|
{
|
|
source.insert(0, declarationPrefix + alias.second + std::string(";\n"));
|
|
if (_manualVertexAliasing) bindAttribute(program, alias);
|
|
}
|
|
}
|
|
|
|
void replaceBuiltInUniform(std::string& source, const std::string& originalStr, const std::string& newStr, const std::string& declarationPrefix)
|
|
{
|
|
if (replace(source, originalStr, newStr))
|
|
{
|
|
source.insert(0, declarationPrefix + newStr + std::string(";\n"));
|
|
}
|
|
}
|
|
|
|
void convertVertexShader(osg::Program& program, osg::Shader& shader)
|
|
{
|
|
std::string source = shader.getShaderSource();
|
|
|
|
// replace ftransform as it only works with built-ins
|
|
replace(source, "ftransform()", "gl_ModelViewProjectionMatrix * gl_Vertex");
|
|
|
|
#if 1
|
|
replaceAndBindAttrib(program, source, "gl_Normal", _normalAlias, "attribute vec3 ");
|
|
replaceAndBindAttrib(program, source, "gl_Vertex", _vertexAlias, "attribute vec4 ");
|
|
replaceAndBindAttrib(program, source, "gl_Color", _colorAlias, "attribute vec4 ");
|
|
replaceAndBindAttrib(program, source, "gl_SecondaryColor", _secondaryColorAlias, "attribute vec4 ");
|
|
replaceAndBindAttrib(program, source, "gl_FogCoord", _fogCoordAlias, "attribute float ");
|
|
|
|
replaceAndBindAttrib(program, source, "gl_MultiTexCoord0", _texCoordAlias[0], "attribute vec4 ");
|
|
replaceAndBindAttrib(program, source, "gl_MultiTexCoord1", _texCoordAlias[1], "attribute vec4 ");
|
|
replaceAndBindAttrib(program, source, "gl_MultiTexCoord2", _texCoordAlias[2], "attribute vec4 ");
|
|
replaceAndBindAttrib(program, source, "gl_MultiTexCoord3", _texCoordAlias[3], "attribute vec4 ");
|
|
replaceAndBindAttrib(program, source, "gl_MultiTexCoord4", _texCoordAlias[4], "attribute vec4 ");
|
|
replaceAndBindAttrib(program, source, "gl_MultiTexCoord5", _texCoordAlias[5], "attribute vec4 ");
|
|
replaceAndBindAttrib(program, source, "gl_MultiTexCoord6", _texCoordAlias[6], "attribute vec4 ");
|
|
replaceAndBindAttrib(program, source, "gl_MultiTexCoord7", _texCoordAlias[7], "attribute vec4 ");
|
|
#endif
|
|
|
|
#if 1
|
|
// replace built in uniform
|
|
replaceBuiltInUniform(source, "gl_ModelViewMatrix", "osg_ModelViewMatrix", "uniform mat4 ");
|
|
replaceBuiltInUniform(source, "gl_ModelViewProjectionMatrix", "osg_ModelViewProjectionMatrix", "uniform mat4 ");
|
|
replaceBuiltInUniform(source, "gl_ProjectionMatrix", "osg_ProjectionMatrix", "uniform mat4 ");
|
|
#endif
|
|
shader.setShaderSource(source);
|
|
}
|
|
|
|
void convertFragmentShader(osg::Program& /*program*/, osg::Shader& /*shader*/)
|
|
{
|
|
}
|
|
|
|
virtual void reset()
|
|
{
|
|
_visited.clear();
|
|
}
|
|
|
|
void apply(osg::Node& node)
|
|
{
|
|
if (_visited.count(&node)!=0) return;
|
|
_visited.insert(&node);
|
|
|
|
if (node.getStateSet()) apply(*(node.getStateSet()));
|
|
traverse(node);
|
|
}
|
|
|
|
void apply(osg::Geode& geode)
|
|
{
|
|
if (_visited.count(&geode)!=0) return;
|
|
_visited.insert(&geode);
|
|
|
|
if (geode.getStateSet()) apply(*(geode.getStateSet()));
|
|
|
|
for(unsigned int i=0; i<geode.getNumDrawables(); ++i)
|
|
{
|
|
if (geode.getDrawable(i)->getStateSet()) apply(*(geode.getDrawable(i)->getStateSet()));
|
|
|
|
osg::Geometry* geom = geode.getDrawable(i)->asGeometry();
|
|
if (geom) apply(*geom);
|
|
}
|
|
}
|
|
|
|
bool replace(std::string& str, const std::string& original_phrase, const std::string& new_phrase)
|
|
{
|
|
bool replacedStr = false;
|
|
std::string::size_type pos = 0;
|
|
while((pos=str.find(original_phrase, pos))!=std::string::npos)
|
|
{
|
|
std::string::size_type endOfPhrasePos = pos+original_phrase.size();
|
|
if (endOfPhrasePos<str.size())
|
|
{
|
|
char c = str[endOfPhrasePos];
|
|
if ((c>='0' && c<='9') ||
|
|
(c>='a' && c<='z') ||
|
|
(c>='A' && c<='Z'))
|
|
{
|
|
pos = endOfPhrasePos;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
replacedStr = true;
|
|
str.replace(pos, original_phrase.size(), new_phrase);
|
|
}
|
|
return replacedStr;
|
|
}
|
|
|
|
void apply(osg::Program& program, osg::Shader& shader)
|
|
{
|
|
if (_visited.count(&shader)!=0) return;
|
|
_visited.insert(&shader);
|
|
|
|
osg::notify(osg::NOTICE)<<"Shader "<<shader.getTypename()<<" ----before-----------"<<std::endl;
|
|
osg::notify(osg::NOTICE)<<shader.getShaderSource()<<std::endl;
|
|
|
|
if (shader.getType()==osg::Shader::VERTEX) convertVertexShader(program, shader);
|
|
else if (shader.getType()==osg::Shader::FRAGMENT) convertFragmentShader(program, shader);
|
|
|
|
osg::notify(osg::NOTICE)<<"--after-----------"<<std::endl;
|
|
osg::notify(osg::NOTICE)<<shader.getShaderSource()<<std::endl;
|
|
osg::notify(osg::NOTICE)<<"---------------------"<<std::endl;
|
|
}
|
|
|
|
void apply(osg::StateSet& stateset)
|
|
{
|
|
if (_visited.count(&stateset)!=0) return;
|
|
_visited.insert(&stateset);
|
|
|
|
return;
|
|
|
|
osg::notify(osg::NOTICE)<<"Found stateset "<<&stateset<<std::endl;
|
|
osg::Program* program = dynamic_cast<osg::Program*>(stateset.getAttribute(osg::StateAttribute::PROGRAM));
|
|
if (program)
|
|
{
|
|
osg::notify(osg::NOTICE)<<" Found Program "<<program<<std::endl;
|
|
for(unsigned int i=0; i<program->getNumShaders(); ++i)
|
|
{
|
|
apply(*program, *(program->getShader(i)));
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
void apply(osg::Geometry& geom)
|
|
{
|
|
geom.setUseDisplayList(false);
|
|
|
|
if (!_manualVertexAliasing) return;
|
|
|
|
osg::notify(osg::NOTICE)<<"Found geometry "<<&geom<<std::endl;
|
|
if (geom.getVertexArray())
|
|
{
|
|
setVertexAttrib(geom, _vertexAlias, geom.getVertexArray(), false, osg::Array::BIND_PER_VERTEX);
|
|
geom.setVertexArray(0);
|
|
}
|
|
|
|
if (geom.getNormalArray())
|
|
{
|
|
setVertexAttrib(geom, _normalAlias, geom.getNormalArray(), true);
|
|
geom.setNormalArray(0);
|
|
}
|
|
|
|
if (geom.getColorArray())
|
|
{
|
|
setVertexAttrib(geom, _colorAlias, geom.getColorArray(), false);
|
|
geom.setColorArray(0);
|
|
}
|
|
|
|
if (geom.getSecondaryColorArray())
|
|
{
|
|
setVertexAttrib(geom, _secondaryColorAlias, geom.getSecondaryColorArray(), false);
|
|
geom.setSecondaryColorArray(0);
|
|
}
|
|
|
|
if (geom.getFogCoordArray())
|
|
{
|
|
// should we normalize the FogCoord array? Don't think so...
|
|
setVertexAttrib(geom, _fogCoordAlias, geom.getFogCoordArray(), false);
|
|
geom.setFogCoordArray(0);
|
|
}
|
|
|
|
unsigned int maxNumTexCoords = geom.getNumTexCoordArrays();
|
|
if (maxNumTexCoords>8)
|
|
{
|
|
osg::notify(osg::NOTICE)<<"Warning: Ignoring "<<maxNumTexCoords-8<<" texture coordinate arrays, only 8 are currently supported in vertex attribute conversion code."<<std::endl;
|
|
maxNumTexCoords = 8;
|
|
}
|
|
for(unsigned int i=0; i<maxNumTexCoords; ++i)
|
|
{
|
|
if (geom.getTexCoordArray(i))
|
|
{
|
|
setVertexAttrib(geom, _texCoordAlias[i], geom.getTexCoordArray(i), false, osg::Array::BIND_PER_VERTEX);
|
|
geom.setTexCoordArray(i,0);
|
|
}
|
|
else
|
|
{
|
|
osg::notify(osg::NOTICE)<<"Found empty TexCoordArray("<<i<<")"<<std::endl;
|
|
}
|
|
}
|
|
}
|
|
|
|
void setVertexAttrib(osg::Geometry& geom, const AttributeAlias& alias, osg::Array* array, bool normalize, osg::Array::Binding binding = osg::Array::BIND_UNDEFINED)
|
|
{
|
|
unsigned int index = alias.first;
|
|
const std::string& name = alias.second;
|
|
array->setName(name);
|
|
if (binding!=osg::Array::BIND_UNDEFINED) array->setBinding(binding);
|
|
array->setNormalize(normalize);
|
|
geom.setVertexAttribArray(index, array);
|
|
|
|
osg::notify(osg::NOTICE)<<" vertex attrib("<<name<<", index="<<index<<", normalize="<<normalize<<" binding="<<binding<<")"<<std::endl;
|
|
}
|
|
|
|
|
|
typedef std::set<osg::Object*> Visited;
|
|
Visited _visited;
|
|
|
|
bool _manualVertexAliasing;
|
|
AttributeAlias _vertexAlias;
|
|
AttributeAlias _normalAlias;
|
|
AttributeAlias _colorAlias;
|
|
AttributeAlias _secondaryColorAlias;
|
|
AttributeAlias _fogCoordAlias;
|
|
AttributeAlias _texCoordAlias[8];
|
|
};
|
|
|
|
osg::Node* createSimpleTestModel()
|
|
{
|
|
osg::Group* group = new osg::Group;
|
|
|
|
osg::Geode* geode = new osg::Geode;
|
|
group->addChild(geode);
|
|
|
|
osg::Geometry* geometry = new osg::Geometry;
|
|
geode->addDrawable(geometry);
|
|
|
|
osg::Vec3Array* vertices = new osg::Vec3Array;
|
|
vertices->push_back(osg::Vec3(0.0,0.0,0.0));
|
|
vertices->push_back(osg::Vec3(0.0,0.0,1.0));
|
|
vertices->push_back(osg::Vec3(1.0,0.0,0.0));
|
|
vertices->push_back(osg::Vec3(1.0,0.0,1.0));
|
|
geometry->setVertexArray(vertices);
|
|
|
|
geometry->addPrimitiveSet(new osg::DrawArrays(GL_TRIANGLE_STRIP, 0, 4));
|
|
|
|
char vertexShaderSource[] =
|
|
"void main(void)\n"
|
|
"{\n"
|
|
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
|
|
"}\n";
|
|
|
|
char fragmentShaderSource[] =
|
|
"void main(void)\n"
|
|
"{\n"
|
|
" gl_FragColor = vec4(1.0,1.0,0.0,1.0); \n"
|
|
"}\n";
|
|
|
|
osg::Program* program = new osg::Program;
|
|
program->addShader(new osg::Shader(osg::Shader::VERTEX, vertexShaderSource));
|
|
program->addShader(new osg::Shader(osg::Shader::FRAGMENT, fragmentShaderSource));
|
|
|
|
geometry->getOrCreateStateSet()->setAttribute(program);
|
|
|
|
return group;
|
|
}
|
|
|
|
osg::Node* createSimpleTextureTestModel()
|
|
{
|
|
osg::Group* group = new osg::Group;
|
|
|
|
osg::Geode* geode = new osg::Geode;
|
|
group->addChild(geode);
|
|
|
|
osg::Geometry* geometry = new osg::Geometry;
|
|
geode->addDrawable(geometry);
|
|
|
|
osg::Vec3Array* vertices = new osg::Vec3Array;
|
|
vertices->push_back(osg::Vec3(0.0,0.0,0.0));
|
|
vertices->push_back(osg::Vec3(0.0,0.0,1.0));
|
|
vertices->push_back(osg::Vec3(1.0,0.0,0.0));
|
|
vertices->push_back(osg::Vec3(1.0,0.0,1.0));
|
|
geometry->setVertexArray(vertices);
|
|
|
|
osg::Vec2Array* texcoords = new osg::Vec2Array;
|
|
texcoords->push_back(osg::Vec2(0.0,0.0));
|
|
texcoords->push_back(osg::Vec2(0.0,1.0));
|
|
texcoords->push_back(osg::Vec2(1.0,0.0));
|
|
texcoords->push_back(osg::Vec2(1.0,1.0));
|
|
geometry->setTexCoordArray(0, texcoords);
|
|
|
|
geometry->addPrimitiveSet(new osg::DrawArrays(GL_TRIANGLE_STRIP, 0, 4));
|
|
|
|
char vertexShaderSource[] =
|
|
"varying vec2 texCoord;\n"
|
|
"void main(void)\n"
|
|
"{\n"
|
|
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
|
|
" texCoord = gl_MultiTexCoord0.xy;\n"
|
|
"}\n";
|
|
|
|
char fragmentShaderSource[] =
|
|
"varying vec2 texCoord;\n"
|
|
"uniform sampler2D baseTexture;\n"
|
|
"void main(void)\n"
|
|
"{\n"
|
|
" gl_FragColor = texture2D(baseTexture, texCoord); \n"
|
|
"}\n";
|
|
|
|
osg::Program* program = new osg::Program;
|
|
program->addShader(new osg::Shader(osg::Shader::VERTEX, vertexShaderSource));
|
|
program->addShader(new osg::Shader(osg::Shader::FRAGMENT, fragmentShaderSource));
|
|
|
|
osg::StateSet* stateset = geometry->getOrCreateStateSet();
|
|
stateset->setAttribute(program);
|
|
|
|
osg::ref_ptr<osg::Image> image = osgDB::readRefImageFile("Images/lz.rgb");
|
|
osg::Texture2D* texture = new osg::Texture2D(image);
|
|
texture->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
|
|
texture->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
|
|
stateset->setTextureAttribute(0, texture);
|
|
|
|
osg::Uniform* baseTextureSampler = new osg::Uniform("baseTexture",0);
|
|
stateset->addUniform(baseTextureSampler);
|
|
|
|
return group;
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
// use an ArgumentParser object to manage the program arguments.
|
|
osg::ArgumentParser arguments(&argc,argv);
|
|
|
|
// construct the viewer.
|
|
osgViewer::Viewer viewer(arguments);
|
|
|
|
std::string outputFileName;
|
|
while (arguments.read("-o",outputFileName)) {}
|
|
|
|
osg::ref_ptr<osg::Node> loadedModel;
|
|
|
|
bool runConvertToVertexAttributes = false;
|
|
if (arguments.read("--simple") || arguments.read("--s"))
|
|
{
|
|
loadedModel = createSimpleTestModel();
|
|
}
|
|
else if (arguments.read("--texture") || arguments.read("-t"))
|
|
{
|
|
loadedModel = createSimpleTextureTestModel();
|
|
}
|
|
else
|
|
{
|
|
bool runShaderGen = true;
|
|
while (arguments.read("--shader-gen")) { runShaderGen = true; }
|
|
while (arguments.read("--no-shader-gen")) { runShaderGen = false; }
|
|
|
|
while (arguments.read("--vertex-attrib")) { runConvertToVertexAttributes = true; }
|
|
while (arguments.read("--no-vertex-attrib")) { runConvertToVertexAttributes = false; }
|
|
|
|
loadedModel = osgDB::readRefNodeFiles(arguments);
|
|
if (!loadedModel.get())
|
|
{
|
|
osg::notify(osg::NOTICE)<<"No model loaded, please specify a model filename."<<std::endl;
|
|
return 1;
|
|
}
|
|
|
|
if (runShaderGen)
|
|
{
|
|
// convert fixed function pipeline to shaders
|
|
osgUtil::ShaderGenVisitor sgv;
|
|
loadedModel->accept(sgv);
|
|
}
|
|
|
|
if (runConvertToVertexAttributes)
|
|
{
|
|
// find any conventional vertex, colour, normal and tex coords arrays and convert to vertex attributes
|
|
ConvertToVertexAttibArrays ctvaa;
|
|
loadedModel->accept(ctvaa);
|
|
}
|
|
}
|
|
|
|
if (!loadedModel) return 1;
|
|
|
|
if (!outputFileName.empty())
|
|
{
|
|
osgDB::writeNodeFile(*loadedModel, outputFileName);
|
|
return 0;
|
|
}
|
|
|
|
// add a viewport to the viewer and attach the scene graph.
|
|
viewer.setSceneData(loadedModel);
|
|
|
|
viewer.setCameraManipulator(new osgGA::TrackballManipulator());
|
|
|
|
// add the stats handler
|
|
viewer.addEventHandler(new osgViewer::StatsHandler);
|
|
|
|
viewer.realize();
|
|
|
|
|
|
if (runConvertToVertexAttributes)
|
|
{
|
|
// switch on the uniforms that track the modelview and projection matrices
|
|
osgViewer::Viewer::Windows windows;
|
|
viewer.getWindows(windows);
|
|
for(osgViewer::Viewer::Windows::iterator itr = windows.begin();
|
|
itr != windows.end();
|
|
++itr)
|
|
{
|
|
(*itr)->getState()->setUseModelViewAndProjectionUniforms(true);
|
|
(*itr)->getState()->setUseVertexAttributeAliasing(true);
|
|
}
|
|
}
|
|
|
|
return viewer.run();
|
|
}
|