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

Copyright (c) 2000-2014 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __D3D9HLSLProgram_H__
#define __D3D9HLSLProgram_H__

#include "OgreD3D9Prerequisites.h"
#include "OgreHighLevelGpuProgram.h"

namespace Ogre {
    /** Specialisation of HighLevelGpuProgram to provide support for D3D9 
        High-Level Shader Language (HLSL).
    @remarks
        Note that the syntax of D3D9 HLSL is identical to nVidia's Cg language, therefore
        unless you know you will only ever be deploying on Direct3D, or you have some specific
        reason for not wanting to use the Cg plugin, I suggest you use Cg instead since that
        can produce programs for OpenGL too.
    */
    class _OgreD3D9Export D3D9HLSLProgram : public HighLevelGpuProgram
    {
    public:
        /// Command object for setting entry point
        class CmdEntryPoint : public ParamCommand
        {
        public:
            String doGet(const void* target) const;
            void doSet(void* target, const String& val);
        };
        /// Command object for setting target assembler
        class CmdTarget : public ParamCommand
        {
        public:
            String doGet(const void* target) const;
            void doSet(void* target, const String& val);
        };
        /// Command object for setting macro defines
        class CmdPreprocessorDefines : public ParamCommand
        {
        public:
            String doGet(const void* target) const;
            void doSet(void* target, const String& val);
        };
        /// Command object for setting matrix packing in column-major order
        class CmdColumnMajorMatrices : public ParamCommand
        {
        public:
            String doGet(const void* target) const;
            void doSet(void* target, const String& val);
        };
        /// Command object for setting optimisation level
        class CmdOptimisation : public ParamCommand
        {
        public:
            String doGet(const void* target) const;
            void doSet(void* target, const String& val);
        };

        /// Command object for getting/setting micro code
        class CmdMicrocode : public ParamCommand
        {
        public:
            String doGet(const void* target) const;
            void doSet(void* target, const String& val);
        };

        /// Command object for getting/setting assembler code
        class CmdAssemblerCode : public ParamCommand
        {
        public:
            String doGet(const void* target) const;
            void doSet(void* target, const String& val);
        };

        /// Command object for enabling backwards compatibility
        class CmdBackwardsCompatibility : public ParamCommand
        {
        public:
            String doGet(const void* target) const;
            void doSet(void* target, const String& val);
        };

    protected:

        static CmdEntryPoint msCmdEntryPoint;
        static CmdTarget msCmdTarget;
        static CmdPreprocessorDefines msCmdPreprocessorDefines;
        static CmdColumnMajorMatrices msCmdColumnMajorMatrices;
        static CmdOptimisation msCmdOptimisation;
        static CmdMicrocode msCmdMicrocode;
        static CmdAssemblerCode msCmdAssemblerCode;
        static CmdBackwardsCompatibility msCmdBackwardsCompatibility;

        /** Internal load implementation, must be implemented by subclasses.
        */
        void loadFromSource(void);
        /** Internal method for creating an appropriate low-level program from this
        high-level program, must be implemented by subclasses. */
        void createLowLevelImpl(void);
        /// Internal unload implementation, must be implemented by subclasses
        void unloadHighLevelImpl(void);
        /// Populate the passed parameters with name->index map, must be overridden
        void buildConstantDefinitions() const;

        // Recursive utility method for buildParamNameMap
        void processParamElement(LPD3DXCONSTANTTABLE pConstTable, D3DXHANDLE parent, String prefix, unsigned int index);
        void populateDef(D3DXCONSTANT_DESC& d3dDesc, GpuConstantDefinition& def) const;

        String mTarget;
        String mEntryPoint;
        String mPreprocessorDefines;
        bool mColumnMajorMatrices;
        bool mBackwardsCompatibility;

        LPD3DXBUFFER mMicroCode;

        GpuConstantDefinitionMap mParametersMap;
        size_t mParametersMapSizeAsBuffer;

    public:
        LPD3DXBUFFER getMicroCode();
    public:
        /// Shader optimisation level
        enum OptimisationLevel
        {
            /// default - no optimisation in debug mode, OPT_1 in release mode
            OPT_DEFAULT,
            /// No optimisation
            OPT_NONE,
            /// Optimisation level 0
            OPT_0, 
            /// Optimisation level 1
            OPT_1,
            /// Optimisation level 2
            OPT_2, 
            /// Optimisation level 3
            OPT_3
        };
    protected:
        OptimisationLevel mOptimisationLevel;

        /** Gets the microcode from the microcode cache. */
        void getMicrocodeFromCache(void);
        /** Compiles the microcode from the program source. */
        void compileMicrocode(void);
        void addMicrocodeToCache();
    public:
        D3D9HLSLProgram(ResourceManager* creator, const String& name, ResourceHandle handle,
            const String& group, bool isManual, ManualResourceLoader* loader);
        ~D3D9HLSLProgram();

        /** Sets the entry point for this program ie the first method called. */
        void setEntryPoint(const String& entryPoint) { mEntryPoint = entryPoint; }
        /** Gets the entry point defined for this program. */
        const String& getEntryPoint(void) const { return mEntryPoint; }
        /** Sets the shader target to compile down to, e.g. 'vs_1_1'. */
        void setTarget(const String& target);
        /** Gets the shader target to compile down to, e.g. 'vs_1_1'. */
        const String& getTarget(void) const { return mTarget; }
        /** Sets the preprocessor defines use to compile the program. */
        void setPreprocessorDefines(const String& defines) { mPreprocessorDefines = defines; }
        /** Sets the preprocessor defines use to compile the program. */
        const String& getPreprocessorDefines(void) const { return mPreprocessorDefines; }
        /** Sets whether matrix packing in column-major order. */ 
        void setColumnMajorMatrices(bool columnMajor) { mColumnMajorMatrices = columnMajor; }
        /** Gets whether matrix packed in column-major order. */
        bool getColumnMajorMatrices(void) const { return mColumnMajorMatrices; }
        /** Sets whether backwards compatibility mode should be enabled. */
        void setBackwardsCompatibility(bool compat) { mBackwardsCompatibility = compat; }
        /** Gets whether backwards compatibility mode should be enabled. */
        bool getBackwardsCompatibility(void) const { return mBackwardsCompatibility; }
        /** Sets the optimisation level to use.
        @param opt Optimisation level
        */
        void setOptimisationLevel(OptimisationLevel opt) { mOptimisationLevel = opt; }

        /** Gets the optimisation level to use. */
        OptimisationLevel getOptimisationLevel() const { return mOptimisationLevel; }

        /// Overridden from GpuProgram
        bool isSupported(void) const;
        /// Overridden from GpuProgram
        GpuProgramParametersSharedPtr createParameters(void);
        /// Overridden from GpuProgram
        const String& getLanguage(void) const;
    };
}

#endif
