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#include <osg/ArgumentParser>
#include <osg/ApplicationUsage>
#include <osgDB/ReadFile>
#include <osgDB/FileNameUtils>
#include <osgDB/fstream>
#include <iostream>
// Search in str for all occurences of spat and replace them with rpat.
void searchAndReplace(std::string& str, const std::string& spat, const std::string& rpat)
{
std::string::size_type pos = 0;
while ((pos = str.find(spat, pos)) != std::string::npos)
{
str.replace(pos, spat.length(), rpat);
pos += rpat.length();
}
}
void writeShader(osg::Shader* shader, const std::string& cppFileName, const std::string& variableName)
{
osgDB::ofstream fout(cppFileName.c_str());
if (!fout)
{
std::cout<<"Error: could not open file `"<<cppFileName<<"` for writing."<<std::endl;
}
std::string shaderSource = shader->getShaderSource();
searchAndReplace(shaderSource, "\r\n", "\n");
searchAndReplace(shaderSource, "\r", "\n");
searchAndReplace(shaderSource, "\"", "\\\"");
std::string variableString = std::string("char ")+variableName+std::string("[] = ");
std::string::size_type startOfLine = 0;
std::string::size_type endOfLine = shaderSource.find_first_of('\n', startOfLine);
if (endOfLine==std::string::npos)
{
fout<<variableString<<shaderSource<<"\\n\";"<<std::endl;
}
else
{
std::string padding(variableString.size(),' ');
fout<<variableString<<"\""<<shaderSource.substr(startOfLine,endOfLine-startOfLine)<<"\\n\""<<std::endl;
startOfLine = endOfLine+1;
endOfLine = shaderSource.find_first_of('\n', startOfLine);
while (endOfLine != std::string::npos)
{
fout<<padding<<"\""<<shaderSource.substr(startOfLine,endOfLine-startOfLine)<<"\\n\""<<std::endl;
startOfLine = endOfLine + 1;
endOfLine = shaderSource.find_first_of('\n', startOfLine);
}
fout<<padding<<"\""<<shaderSource.substr(startOfLine,endOfLine-startOfLine)<<"\\n\";"<<std::endl;
}
std::cout<<"Written shader to `"<<cppFileName<<"`"<<std::endl;
}
int main( int argc, char **argv )
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc,argv);
// set up the usage document, in case we need to print out how to use this program.
arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is a utility for converting glsl shader files into char arrays that can be compiled into applications.");
arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
arguments.getApplicationUsage()->addCommandLineOption("--shader <filename>","Shader file to create a .cpp file for.");
arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display command line parameters");
// if user request help write it out to cout.
if (arguments.read("-h") || arguments.read("--help"))
{
arguments.getApplicationUsage()->write(std::cout);
return 1;
}
std::string filename;
if (arguments.read("--shader",filename))
{
osg::ref_ptr<osg::Shader> shader = osgDB::readShaderFile(filename);
if (shader.valid())
{
std::string name = osgDB::getStrippedName(filename);
std::string path = osgDB::getFilePath(filename);
std::string invalidCharacters = "-+/\\*=(){}[]:;<>,.?@'~#`!\"";
std::string numbericCharacters = "0123456789";
std::string::size_type pos = name.find_first_of(invalidCharacters);
while (pos != std::string::npos)
{
name[pos] = '_';
pos = name.find_first_of(invalidCharacters);
}
std::string ext = osgDB::getFileExtension(filename);
std::string cppFileName = osgDB::concatPaths(path, name + "_" + ext + ".cpp");
std::string variableName = name + "_" + ext;
writeShader(shader.get(), cppFileName, variableName);
return 0;
}
else
{
std::cout<<"Error: could not find file '"<<filename<<"'"<<std::endl;
return 1;
}
}
std::cout<<"No appropriate command line options used."<<std::endl;
arguments.getApplicationUsage()->write(std::cout);
return 1;
}
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