source: downloads/OgreMain/include/OgreCompositorScriptCompiler.h @ 3

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/

#ifndef __CompositorScriptScompiler_H__
#define __CompositorScriptScompiler_H__

#include "OgrePrerequisites.h"
#include "OgreCompiler2Pass.h"
#include "OgreCompositor.h"
#include "OgreRenderSystem.h"


namespace Ogre {

        /** Compiler for parsing & lexing .compositor scripts */
        class _OgreExport CompositorScriptCompiler : public Compiler2Pass
        {

        public:
                CompositorScriptCompiler(void);
                ~CompositorScriptCompiler(void);

        /** gets BNF Grammer for Compositor script.
        */
        virtual const String& getClientBNFGrammer(void) const;

        /** get the name of the Compositor script BNF grammer.
        */
        virtual const String& getClientGrammerName(void) const;

        /** Compile a compositor script from a data stream using a specific resource group name.
        @param stream Weak reference to a data stream which is the source of the material script
        @param groupName The name of the resource group that resources which are
                        parsed are to become a member of. If this group is loaded or unloaded,
                        then the resources discovered in this script will be loaded / unloaded
                        with it.
        */
        void parseScript(DataStreamPtr& stream, const String& groupName)
        {
            mScriptContext.groupName = groupName;
            Compiler2Pass::compile(stream->getAsString(),  stream->getName());
        }

        protected:
                // Token ID enumeration
                enum TokenID {
                        // Terminal Tokens section
                        ID_UNKOWN = 0,
                        // Techniques
                        ID_TARGET_WIDTH, ID_TARGET_HEIGHT,
                        ID_PF_A8R8G8B8, ID_PF_R8G8B8A8, ID_PF_R8G8B8, 
                        ID_PF_FLOAT16_R, ID_PF_FLOAT16_RGB, ID_PF_FLOAT16_RGBA,
                        ID_PF_FLOAT32_R, ID_PF_FLOAT32_RGB, ID_PF_FLOAT32_RGBA,
                        ID_PF_FLOAT16_GR, ID_PF_FLOAT32_GR,
                        // Targets
                        ID_PREVIOUS, ID_NONE,
                        // Passes
                        ID_RENDER_QUAD, ID_CLEAR, ID_STENCIL, ID_RENDER_SCENE,
                        // Clear section
                        ID_CLR_COLOUR, ID_CLR_DEPTH,
                        // Stencil section

                        // compare functions
            ID_ST_ALWAYS_FAIL, ID_ST_ALWAYS_PASS, ID_ST_LESS,
            ID_ST_LESS_EQUAL, ID_ST_EQUAL, ID_ST_NOT_EQUAL,
            ID_ST_GREATER_EQUAL, ID_ST_GREATER,

            // stencil operations
            ID_ST_KEEP, ID_ST_ZERO, ID_ST_REPLACE, ID_ST_INCREMENT,
            ID_ST_DECREMENT, ID_ST_INCREMENT_WRAP, ID_ST_DECREMENT_WRAP,
            ID_ST_INVERT,

                        // general
                        ID_ON, ID_OFF, ID_TRUE, ID_FALSE,
            // where auto generated tokens start so donot remove
            ID_AUTOTOKENSTART
                };

                /** Enum to identify compositor sections. */
                enum CompositorScriptSection
                {
                        CSS_NONE,
                        CSS_COMPOSITOR,
                        CSS_TECHNIQUE,
                        CSS_TARGET,
                        CSS_PASS
                };
                /** Struct for holding the script context while parsing. */
                struct CompositorScriptContext
                {
                        CompositorScriptSection section;
                    String groupName;
                        CompositorPtr compositor;
                        CompositionTechnique* technique;
                        CompositionTargetPass* target;
                        CompositionPass* pass;
                };

                CompositorScriptContext mScriptContext;

                typedef void (CompositorScriptCompiler::* CSC_Action)(void);
                typedef std::map<size_t, CSC_Action> TokenActionMap;
                typedef TokenActionMap::iterator TokenActionIterator;
                /** Map of Token value as key to an Action.  An Action converts tokens into
                the final format.
            All instances use the same Token Action Map.
                */
                static TokenActionMap mTokenActionMap;

                /** Execute an Action associated with a token.  Gets called when the compiler finishes tokenizing a
                section of the source that has been parsed.
                **/
                virtual void executeTokenAction(const size_t tokenID);
        /** Get the start position of auto generated token IDs.
        */
        virtual size_t getAutoTokenIDStart() const {return ID_AUTOTOKENSTART;}
                /** Associate all the lexemes used in a material script with their corresponding tokens and actions.
                **/
        virtual void setupTokenDefinitions(void);
                void addLexemeTokenAction(const String& lexeme, const size_t token, const CSC_Action action = 0);
        void addLexemeAction(const String& lexeme, const CSC_Action action) { addLexemeTokenAction(lexeme, 0, action); }

                void logParseError(const String& error);

                // Token Actions which get called when tokens are created during parsing.
                void parseOpenBrace(void);
                void parseCloseBrace(void);
                void parseCompositor(void);
                void parseTechnique(void);
                void parseTexture(void);
                void parseTarget(void);
                void parseInput(void);
                void parseTargetOutput(void);
                void parseOnlyInitial(void);
                void parseVisibilityMask(void);
                void parseLodBias(void);
                void parseMaterialScheme(void);
                void parsePass(void);
                void parseMaterial(void);
                void parseFirstRenderQueue(void);
                void parseLastRenderQueue(void);
                void parseIdentifier(void);
                void parseClearBuffers(void);
                void parseClearColourValue(void);
                void parseClearDepthValue(void);
                void parseClearStencilValue(void);
                void parseStencilCheck(void);
                void parseStencilFunc(void);
                void parseStencilRefVal(void);
                void parseStencilMask(void);
                void parseStencilFailOp(void);
                void parseStencilDepthFailOp(void);
                void parseStencilPassOp(void);
                void parseStencilTwoSided(void);
                StencilOperation extractStencilOp(void);
        CompareFunction extractCompareFunc(void);
        };
}

#endif