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/* Copyright (C) 2021 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/>.
*/
#ifndef INCLUDED_PREPROCESSORWRAPPER
#define INCLUDED_PREPROCESSORWRAPPER
#include "ps/CStr.h"
#include "third_party/ogre3d_preprocessor/OgreGLSLPreprocessor.h"
#include <functional>
#include <unordered_map>
class CShaderDefines;
/**
* Convenience wrapper around CPreprocessor.
*/
class CPreprocessorWrapper
{
public:
using IncludeRetrieverCallback = std::function<bool(const CStr&, CStr& out)>;
CPreprocessorWrapper();
CPreprocessorWrapper(const IncludeRetrieverCallback& includeCallback);
void AddDefine(const char* name, const char* value);
void AddDefines(const CShaderDefines& defines);
bool TestConditional(const CStr& expr);
// Find all #include directives in the input and replace them by
// by a file content from the directive's argument. Parsing is strict
// and simple. The directive will be expanded in comments and multiline
// strings.
CStr ResolveIncludes(const CStr& source);
CStr Preprocess(const CStr& input);
static void PyrogenesisShaderError(int iLine, const char* iError, const Ogre::CPreprocessor::Token* iToken);
private:
Ogre::CPreprocessor m_Preprocessor;
IncludeRetrieverCallback m_IncludeCallback;
std::unordered_map<CStr, CStr> m_IncludeCache;
};
#endif // INCLUDED_PREPROCESSORWRAPPER
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