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/* Copyright (C) 2012 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#include "PreprocessorWrapper.h"
#include "graphics/ShaderDefines.h"
#include "ps/CLogger.h"
void CPreprocessorWrapper::AddDefine(const char* name, const char* value)
{
m_Preprocessor.Define(name, value);
}
void CPreprocessorWrapper::AddDefines(const CShaderDefines& defines)
{
std::map<CStrIntern, CStrIntern> map = defines.GetMap();
for (std::map<CStrIntern, CStrIntern>::const_iterator it = map.begin(); it != map.end(); ++it)
m_Preprocessor.Define(it->first.c_str(), it->first.length(), it->second.c_str(), it->second.length());
}
bool CPreprocessorWrapper::TestConditional(const CStr& expr)
{
// Construct a dummy program so we can trigger the preprocessor's expression
// code without modifying its public API.
// Be careful that the API buggily returns a statically allocated pointer
// (which we will try to free()) if the input just causes it to append a single
// sequence of newlines to the output; the "\n" after the "#endif" is enough
// to avoid this case.
CStr input = "#if ";
input += expr;
input += "\n1\n#endif\n";
size_t len = 0;
char* output = m_Preprocessor.Parse(input.c_str(), input.size(), len);
if (!output)
{
LOGERROR("Failed to parse conditional expression '%s'", expr.c_str());
return false;
}
bool ret = (memchr(output, '1', len) != NULL);
// Free output if it's not inside the source string
if (!(output >= input.c_str() && output < input.c_str() + input.size()))
free(output);
return ret;
}
CStr CPreprocessorWrapper::Preprocess(const CStr& input)
{
size_t len = 0;
char* output = m_Preprocessor.Parse(input.c_str(), input.size(), len);
if (!output)
{
LOGERROR("Shader preprocessing failed");
return "";
}
CStr ret(output, len);
// Free output if it's not inside the source string
if (!(output >= input.c_str() && output < input.c_str() + input.size()))
free(output);
return ret;
}
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