linux-wallpaperengine-kde/wallpaperengine/shaders/compiler.h

#ifndef __BASIC_SHADER_LOADER_H__
#define __BASIC_SHADER_LOADER_H__

#include <irrlicht/irrlicht.h>
#include <iostream>
#include <vector>
#include <map>

#include <wallpaperengine/fs/fileResolver.h>

namespace wp
{
    namespace shaders
    {
        /**
         * A basic shader loader that adds basic function definitions to every loaded shader
         */
        class compiler
        {
        public:
            struct VariableReplacement
            {
                const char* original;
                const char* replacement;
            };

            struct TypeName
            {
                const char* name;
                int size;
            };

            enum Type
            {
                Type_Vertex = 0,
                Type_Pixel = 1,
            };

            static std::map<std::string, std::string> sVariableReplacement;
            static std::vector<std::string> sTypes;

            compiler (irr::io::path file, Type type, bool recursive = false);
            std::string precompile();

        private:
            bool peekString (std::string str, std::string::const_iterator& it);
            bool expectSemicolon (std::string::const_iterator& it);
            void ignoreSpaces (std::string::const_iterator& it);
            void ignoreUpToNextLineFeed (std::string::const_iterator& it);
            void ignoreUpToBlockCommentEnd (std::string::const_iterator& it);
            std::string extractType (std::string::const_iterator& it);
            std::string extractName (std::string::const_iterator& it);
            std::string extractQuotedValue (std::string::const_iterator& it);
            std::string lookupShaderFile (std::string filename);
            std::string lookupReplaceSymbol (std::string symbol);

            bool isChar (std::string::const_iterator& it);
            bool isNumeric (std::string::const_iterator& it);

            irr::io::path m_file;
            std::string m_content;
            std::string m_compiledContent;
            bool m_error;
            std::string m_errorInfo;
            Type m_type;
            wp::fs::fileResolver m_resolver;
        };
    }
}

#endif /* !__BASIC_SHADER_LOADER_H__ */