root/OpenSceneGraph/trunk/examples/osg2cpp/osg2cpp.cpp @ 14398

Revision 14015, 4.7 kB (checked in by robert, 3 days ago)

Added shaders to support experimental shader based displacement mapping technique osgTerrain::ShaderTerrain?.

  • Property svn:eol-style set to native
Line 
1#include <osg/ArgumentParser>
2#include <osg/ApplicationUsage>
3
4#include <osgDB/ReadFile>
5#include <osgDB/FileNameUtils>
6#include <osgDB/fstream>
7
8#include <iostream>
9
10// Search in str for all occurences of spat and replace them with rpat.
11void searchAndReplace(std::string& str, const std::string& spat, const std::string& rpat)
12{
13    std::string::size_type pos = 0;
14    while ((pos = str.find(spat, pos)) != std::string::npos)
15    {
16        str.replace(pos, spat.length(), rpat);
17        pos += rpat.length();
18    }
19}
20
21void writeShader(osg::Shader* shader, const std::string& cppFileName, const std::string& variableName)
22{
23    osgDB::ofstream fout(cppFileName.c_str());
24    if (!fout)
25    {
26        std::cout<<"Error: could not open file `"<<cppFileName<<"` for writing."<<std::endl;
27    }
28
29    std::string shaderSource = shader->getShaderSource();
30    searchAndReplace(shaderSource, "\r\n", "\n");
31    searchAndReplace(shaderSource, "\r", "\n");
32    searchAndReplace(shaderSource, "\"", "\\\"");
33
34    std::string variableString = std::string("char ")+variableName+std::string("[] = ");
35
36    std::string::size_type startOfLine = 0;
37    std::string::size_type endOfLine = shaderSource.find_first_of('\n', startOfLine);
38
39    if (endOfLine==std::string::npos)
40    {
41        fout<<variableString<<shaderSource<<"\\n\";"<<std::endl;
42    }
43    else
44    {
45        std::string padding(variableString.size(),' ');
46
47        fout<<variableString<<"\""<<shaderSource.substr(startOfLine,endOfLine-startOfLine)<<"\\n\""<<std::endl;
48        startOfLine = endOfLine+1;
49        endOfLine = shaderSource.find_first_of('\n', startOfLine);
50
51        while (endOfLine != std::string::npos)
52        {
53            fout<<padding<<"\""<<shaderSource.substr(startOfLine,endOfLine-startOfLine)<<"\\n\""<<std::endl;
54            startOfLine = endOfLine + 1;
55            endOfLine = shaderSource.find_first_of('\n', startOfLine);
56        }
57        fout<<padding<<"\""<<shaderSource.substr(startOfLine,endOfLine-startOfLine)<<"\\n\";"<<std::endl;
58    }
59    std::cout<<"Written shader to `"<<cppFileName<<"`"<<std::endl;
60}
61
62int main( int argc, char **argv )
63{
64    // use an ArgumentParser object to manage the program arguments.
65    osg::ArgumentParser arguments(&argc,argv);
66
67    // set up the usage document, in case we need to print out how to use this program.
68    arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
69    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is a utility for converting glsl shader files into char arrays that can be compiled into applications.");
70    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
71    arguments.getApplicationUsage()->addCommandLineOption("--shader <filename>","Shader file to create a .cpp file for.");
72    arguments.getApplicationUsage()->addCommandLineOption("--write-to-source-file-directory","Use the path to the source filename as the directory to write to.");
73    arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display command line parameters");
74
75    // if user request help write it out to cout.
76    if (arguments.read("-h") || arguments.read("--help"))
77    {
78        arguments.getApplicationUsage()->write(std::cout);
79        return 1;
80    }
81
82    bool useSamePathAsSourceFile = false;
83    if (arguments.read("--write-to-source-file-directory")) useSamePathAsSourceFile = true;
84
85    std::string filename;
86    if (arguments.read("--shader",filename))
87    {
88        osg::ref_ptr<osg::Shader> shader = osgDB::readShaderFile(filename);
89        if (shader.valid())
90        {
91            std::string name = osgDB::getStrippedName(filename);
92            std::string path = osgDB::getFilePath(filename);
93            std::string invalidCharacters = "-+/\\*=(){}[]:;<>,.?@'~#`!\"";
94            std::string numbericCharacters = "0123456789";
95            std::string::size_type pos = name.find_first_of(invalidCharacters);
96            while (pos != std::string::npos)
97            {
98                name[pos] = '_';
99                pos = name.find_first_of(invalidCharacters);
100            }
101
102            std::string ext = osgDB::getFileExtension(filename);
103            std::string cppFileName = name + "_" + ext + ".cpp";
104            if (useSamePathAsSourceFile) cppFileName = osgDB::concatPaths(path, cppFileName);
105
106            std::string variableName = name + "_" + ext;
107            writeShader(shader.get(), cppFileName, variableName);
108
109            return 0;
110        }
111        else
112        {
113            std::cout<<"Error: could not find file '"<<filename<<"'"<<std::endl;
114            return 1;
115        }
116
117    }
118
119    std::cout<<"No appropriate command line options used."<<std::endl;
120
121    arguments.getApplicationUsage()->write(std::cout);
122    return 1;
123}
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