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_ModeViewMatrix", "uniform mat4 ");
replaceBuiltInUniform(source, "gl_ModelViewProjectionMatrix", "osg_ModelViewProjectionMatrix", "uniform mat4 ");
replaceBuiltInUniform(source, "gl_ProjectionMatrix", "osg_ProjectionMatrix", "uniform mat4 ");
#endif
shader.setShaderSource(source);
}
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;
}
virtual WriteResult writeShader(const osg::Shader& shader,std::ostream& fout,const Options* = NULL) const
{
// get shader source
std::string source = shader.getShaderSource();
// write source to file
fout << source;
// return all things went fine
return WriteResult::FILE_SAVED;
}
static bool readShaderSource( osgDB::InputStream& is, osg::Shader& shader )
{
std::string code;
unsigned int size = is.readSize(); is >> is.BEGIN_BRACKET;
for ( unsigned int i=0; i<size; ++i )
{
std::string line;
is.readWrappedString( line );
code.append( line ); code.append( 1, '\n' );
}
is >> is.END_BRACKET;
shader.setShaderSource( code );
return true;
}
static bool writeShaderSource( osgDB::OutputStream& os, const osg::Shader& shader )
{
std::vector<std::string> lines;
std::istringstream iss( shader.getShaderSource() );
std::string line;
while ( std::getline(iss, line) )
{
lines.push_back( line );
}
os.writeSize(lines.size()); os << os.BEGIN_BRACKET << std::endl;
for ( std::vector<std::string>::const_iterator itr=lines.begin();
itr!=lines.end(); ++itr )
{
os.writeWrappedString( *itr );
os << std::endl;
}
os << os.END_BRACKET << std::endl;
return true;
}
static bool checkShaderSource( const osg::Shader& shader )
{
return !shader.getShaderSource().empty();
}