OpenWalnut 1.2.5
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00001 //--------------------------------------------------------------------------- 00002 // 00003 // Project: OpenWalnut ( http://www.openwalnut.org ) 00004 // 00005 // Copyright 2009 OpenWalnut Community, BSV@Uni-Leipzig and CNCF@MPI-CBS 00006 // For more information see http://www.openwalnut.org/copying 00007 // 00008 // This file is part of OpenWalnut. 00009 // 00010 // OpenWalnut is free software: you can redistribute it and/or modify 00011 // it under the terms of the GNU Lesser General Public License as published by 00012 // the Free Software Foundation, either version 3 of the License, or 00013 // (at your option) any later version. 00014 // 00015 // OpenWalnut is distributed in the hope that it will be useful, 00016 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00018 // GNU Lesser General Public License for more details. 00019 // 00020 // You should have received a copy of the GNU Lesser General Public License 00021 // along with OpenWalnut. If not, see <http://www.gnu.org/licenses/>. 00022 // 00023 //--------------------------------------------------------------------------- 00024 00025 #include <string> 00026 #include <sstream> 00027 #include <ostream> 00028 00029 #include <boost/regex.hpp> 00030 00031 #include "../../common/WLogger.h" 00032 00033 #include "WGEShaderVersionPreprocessor.h" 00034 00035 WGEShaderVersionPreprocessor::WGEShaderVersionPreprocessor() 00036 { 00037 // initialize members 00038 } 00039 00040 WGEShaderVersionPreprocessor::~WGEShaderVersionPreprocessor() 00041 { 00042 // cleanup 00043 } 00044 00045 std::string WGEShaderVersionPreprocessor::process( const std::string& file, const std::string& code ) const 00046 { 00047 if( !getActive() ) 00048 { 00049 return code; 00050 } 00051 00052 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 00053 // Eliminate all #version statements and put it to the beginning. 00054 ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 00055 00056 // this is an expression for the #version statement 00057 static const boost::regex versionRegexp( "^[ ]*#[ ]*version[ ]+([123456789][0123456789][0123456789]).*$" ); 00058 00059 // go through each line again 00060 std::string line; 00061 boost::smatch matches; // the list of matches 00062 bool foundVersion = false; 00063 unsigned int version = 120; // our default version 00064 std::stringstream completeCode( code ); 00065 std::ostringstream cleanedCode; 00066 while( std::getline( completeCode, line ) ) 00067 { 00068 if( boost::regex_match( line, matches, versionRegexp ) ) // look for the #version statement 00069 { 00070 unsigned int versionNum = boost::lexical_cast< unsigned int >( matches[1] ); 00071 version = std::max( versionNum, version ); 00072 foundVersion = true; 00073 continue; 00074 } 00075 00076 cleanedCode << line << std::endl; 00077 } 00078 00079 // no version statement found, assume 1.2 00080 if( !foundVersion ) 00081 { 00082 wlog::warn( "WGEShader (" + file + ")" ) << "No version statements in unrolled shader file \"" << file << "\" found. Using default: " 00083 << version << "."; 00084 } 00085 00086 // the ATI compiler needs the version statement to be the first statement in the shader 00087 std::stringstream vs; 00088 vs << "#version " << version << std::endl << cleanedCode.str(); 00089 return vs.str(); 00090 } 00091