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

Copyright (c) 2000-2009 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.
-----------------------------------------------------------------------------
*/
#include "OgreStableHeaders.h"
#include "OgreGpuProgram.h"
#include "OgreHighLevelGpuProgram.h"
#include "OgreGpuProgramManager.h"
#include "OgreVector3.h"
#include "OgreVector4.h"
#include "OgreAutoParamDataSource.h"
#include "OgreLight.h"
#include "OgreRoot.h"
#include "OgreRenderSystem.h"
#include "OgreRenderSystemCapabilities.h"
#include "OgreStringConverter.h"
#include "OgreLogManager.h"

namespace Ogre
{
    //-----------------------------------------------------------------------------
    GpuProgram::CmdType GpuProgram::msTypeCmd;
    GpuProgram::CmdSyntax GpuProgram::msSyntaxCmd;
    GpuProgram::CmdSkeletal GpuProgram::msSkeletalCmd;
	GpuProgram::CmdMorph GpuProgram::msMorphCmd;
	GpuProgram::CmdPose GpuProgram::msPoseCmd;
	GpuProgram::CmdVTF GpuProgram::msVTFCmd;
	GpuProgram::CmdManualNamedConstsFile GpuProgram::msManNamedConstsFileCmd;
	GpuProgram::CmdAdjacency GpuProgram::msAdjacencyCmd;
	

    //-----------------------------------------------------------------------------
    GpuProgram::GpuProgram(ResourceManager* creator, const String& name, ResourceHandle handle,
        const String& group, bool isManual, ManualResourceLoader* loader) 
        :Resource(creator, name, handle, group, isManual, loader),
        mType(GPT_VERTEX_PROGRAM), mLoadFromFile(true), mSkeletalAnimation(false),
		mMorphAnimation(false), mPoseAnimation(0),
        mVertexTextureFetch(false), mNeedsAdjacencyInfo(false),
		mCompileError(false), mLoadedManualNamedConstants(false)
    {
		createParameterMappingStructures();
    }
    //-----------------------------------------------------------------------------
    void GpuProgram::setType(GpuProgramType t)
    {
        mType = t;
    }
    //-----------------------------------------------------------------------------
    void GpuProgram::setSyntaxCode(const String& syntax)
    {
        mSyntaxCode = syntax;
    }
    //-----------------------------------------------------------------------------
    void GpuProgram::setSourceFile(const String& filename)
    {
        mFilename = filename;
        mSource.clear();
        mLoadFromFile = true;
		mCompileError = false;
    }
    //-----------------------------------------------------------------------------
    void GpuProgram::setSource(const String& source)
    {
        mSource = source;
        mFilename.clear();
        mLoadFromFile = false;
		mCompileError = false;
    }
		

    //-----------------------------------------------------------------------------
    void GpuProgram::loadImpl(void)
    {
        if (mLoadFromFile)
        {
            // find & load source code
            DataStreamPtr stream = 
                ResourceGroupManager::getSingleton().openResource(
					mFilename, mGroup, true, this);
            mSource = stream->getAsString();
        }

        // Call polymorphic load
		try 
		{
			loadFromSource();

			if (!mDefaultParams.isNull())
			{
				// Keep a reference to old ones to copy
				GpuProgramParametersSharedPtr savedParams = mDefaultParams;
				// reset params to stop them being referenced in the next create
				mDefaultParams.setNull();

				// Create new params
				mDefaultParams = createParameters();

				// Copy old (matching) values across
				// Don't use copyConstantsFrom since program may be different
				mDefaultParams->copyMatchingNamedConstantsFrom(*savedParams.get());

			}
		}
		catch (const Exception&)
		{
			// will already have been logged
			LogManager::getSingleton().stream()
				<< "Gpu program " << mName << " encountered an error "
				<< "during loading and is thus not supported.";

			mCompileError = true;
		}

    }
    //-----------------------------------------------------------------------------
    bool GpuProgram::isRequiredCapabilitiesSupported(void) const
    {
		const RenderSystemCapabilities* caps = 
			Root::getSingleton().getRenderSystem()->getCapabilities();

        // If skeletal animation is being done, we need support for UBYTE4
        if (isSkeletalAnimationIncluded() && 
            !caps->hasCapability(RSC_VERTEX_FORMAT_UBYTE4))
        {
            return false;
        }

		// Vertex texture fetch required?
		if (isVertexTextureFetchRequired() && 
			!caps->hasCapability(RSC_VERTEX_TEXTURE_FETCH))
		{
			return false;
		}

        return true;
    }
    //-----------------------------------------------------------------------------
    bool GpuProgram::isSupported(void) const
    {
        if (mCompileError || !isRequiredCapabilitiesSupported())
            return false;

        return GpuProgramManager::getSingleton().isSyntaxSupported(mSyntaxCode);
    }
	//---------------------------------------------------------------------
	void GpuProgram::createParameterMappingStructures(bool recreateIfExists) const
	{
		createLogicalParameterMappingStructures(recreateIfExists);
		createNamedParameterMappingStructures(recreateIfExists);
	}
	//---------------------------------------------------------------------
	void GpuProgram::createLogicalParameterMappingStructures(bool recreateIfExists) const
	{
		if (recreateIfExists || mFloatLogicalToPhysical.isNull())
			mFloatLogicalToPhysical = GpuLogicalBufferStructPtr(OGRE_NEW GpuLogicalBufferStruct());
		if (recreateIfExists || mIntLogicalToPhysical.isNull())
			mIntLogicalToPhysical = GpuLogicalBufferStructPtr(OGRE_NEW GpuLogicalBufferStruct());
	}
	//---------------------------------------------------------------------
	void GpuProgram::createNamedParameterMappingStructures(bool recreateIfExists) const
	{
		if (recreateIfExists || mConstantDefs.isNull())
			mConstantDefs = GpuNamedConstantsPtr(OGRE_NEW GpuNamedConstants());
	}
	//---------------------------------------------------------------------
	void GpuProgram::setManualNamedConstantsFile(const String& paramDefFile)
	{
		mManualNamedConstantsFile = paramDefFile;
		mLoadedManualNamedConstants = false;
	}
	//---------------------------------------------------------------------
	void GpuProgram::setManualNamedConstants(const GpuNamedConstants& namedConstants)
	{
		createParameterMappingStructures();
		*mConstantDefs.get() = namedConstants;

		mFloatLogicalToPhysical->bufferSize = mConstantDefs->floatBufferSize;
		mIntLogicalToPhysical->bufferSize = mConstantDefs->intBufferSize;
		mFloatLogicalToPhysical->map.clear();
		mIntLogicalToPhysical->map.clear();
		// need to set up logical mappings too for some rendersystems
		for (GpuConstantDefinitionMap::const_iterator i = mConstantDefs->map.begin();
			i != mConstantDefs->map.end(); ++i)
		{
			const String& name = i->first;
			const GpuConstantDefinition& def = i->second;
			// only consider non-array entries
			if (name.find("[") == String::npos)
			{
				GpuLogicalIndexUseMap::value_type val(def.logicalIndex, 
					GpuLogicalIndexUse(def.physicalIndex, def.arraySize * def.elementSize, def.variability));
				if (def.isFloat())
				{
					mFloatLogicalToPhysical->map.insert(val);
				}
				else
				{
					mIntLogicalToPhysical->map.insert(val);
				}
			}
		}


	}
    //-----------------------------------------------------------------------------
    GpuProgramParametersSharedPtr GpuProgram::createParameters(void)
    {
        // Default implementation simply returns standard parameters.
        GpuProgramParametersSharedPtr ret = 
            GpuProgramManager::getSingleton().createParameters();
		
		
		// optionally load manually supplied named constants
		if (!mManualNamedConstantsFile.empty() && !mLoadedManualNamedConstants)
		{
			try 
			{
				GpuNamedConstants namedConstants;
				DataStreamPtr stream = 
					ResourceGroupManager::getSingleton().openResource(
					mManualNamedConstantsFile, mGroup, true, this);
				namedConstants.load(stream);
				setManualNamedConstants(namedConstants);
			}
			catch(const Exception& e)
			{
				LogManager::getSingleton().stream() <<
					"Unable to load manual named constants for GpuProgram " << mName <<
					": " << e.getDescription();
			}
			mLoadedManualNamedConstants = true;
		}
		
		
		// set up named parameters, if any
		if (!mConstantDefs.isNull() && !mConstantDefs->map.empty())
		{
			ret->_setNamedConstants(mConstantDefs);
		}
		// link shared logical / physical map for low-level use
		ret->_setLogicalIndexes(mFloatLogicalToPhysical, mIntLogicalToPhysical);

        // Copy in default parameters if present
        if (!mDefaultParams.isNull())
            ret->copyConstantsFrom(*(mDefaultParams.get()));
        
        return ret;
    }
    //-----------------------------------------------------------------------------
    GpuProgramParametersSharedPtr GpuProgram::getDefaultParameters(void)
    {
        if (mDefaultParams.isNull())
        {
            mDefaultParams = createParameters();
        }
        return mDefaultParams;
    }
    //-----------------------------------------------------------------------------
    void GpuProgram::setupBaseParamDictionary(void)
    {
        ParamDictionary* dict = getParamDictionary();

        dict->addParameter(
            ParameterDef("type", "'vertex_program', 'geometry_program' or 'fragment_program'",
                PT_STRING), &msTypeCmd);
        dict->addParameter(
            ParameterDef("syntax", "Syntax code, e.g. vs_1_1", PT_STRING), &msSyntaxCmd);
        dict->addParameter(
            ParameterDef("includes_skeletal_animation", 
            "Whether this vertex program includes skeletal animation", PT_BOOL), 
            &msSkeletalCmd);
		dict->addParameter(
			ParameterDef("includes_morph_animation", 
			"Whether this vertex program includes morph animation", PT_BOOL), 
			&msMorphCmd);
		dict->addParameter(
			ParameterDef("includes_pose_animation", 
			"The number of poses this vertex program supports for pose animation", PT_INT), 
			&msPoseCmd);
		dict->addParameter(
			ParameterDef("uses_vertex_texture_fetch", 
			"Whether this vertex program requires vertex texture fetch support.", PT_BOOL), 
			&msVTFCmd);
		dict->addParameter(
			ParameterDef("manual_named_constants", 
			"File containing named parameter mappings for low-level programs.", PT_BOOL), 
			&msManNamedConstsFileCmd);
		dict->addParameter(
			ParameterDef("uses_adjacency_information",
			"Whether this geometry program requires adjacency information from the input primitives.", PT_BOOL),
			&msAdjacencyCmd);
    }

    //-----------------------------------------------------------------------
    const String& GpuProgram::getLanguage(void) const
    {
        static const String language = "asm";

        return language;
    }
    //-----------------------------------------------------------------------
    //-----------------------------------------------------------------------
    String GpuProgram::CmdType::doGet(const void* target) const
    {
        const GpuProgram* t = static_cast<const GpuProgram*>(target);
        if (t->getType() == GPT_VERTEX_PROGRAM)
        {
            return "vertex_program";
        }
		else if (t->getType() == GPT_GEOMETRY_PROGRAM)
		{
			return "geometry_program";
		}
		else
        {
            return "fragment_program";
        }
    }
    void GpuProgram::CmdType::doSet(void* target, const String& val)
    {
        GpuProgram* t = static_cast<GpuProgram*>(target);
        if (val == "vertex_program")
        {
            t->setType(GPT_VERTEX_PROGRAM);
        }
        else if (val == "geometry_program")
		{
			t->setType(GPT_GEOMETRY_PROGRAM);
		}
		else
        {
            t->setType(GPT_FRAGMENT_PROGRAM);
        }
    }
    //-----------------------------------------------------------------------
    String GpuProgram::CmdSyntax::doGet(const void* target) const
    {
        const GpuProgram* t = static_cast<const GpuProgram*>(target);
        return t->getSyntaxCode();
    }
    void GpuProgram::CmdSyntax::doSet(void* target, const String& val)
    {
        GpuProgram* t = static_cast<GpuProgram*>(target);
        t->setSyntaxCode(val);
    }
    //-----------------------------------------------------------------------
    String GpuProgram::CmdSkeletal::doGet(const void* target) const
    {
        const GpuProgram* t = static_cast<const GpuProgram*>(target);
        return StringConverter::toString(t->isSkeletalAnimationIncluded());
    }
    void GpuProgram::CmdSkeletal::doSet(void* target, const String& val)
    {
        GpuProgram* t = static_cast<GpuProgram*>(target);
        t->setSkeletalAnimationIncluded(StringConverter::parseBool(val));
    }
	//-----------------------------------------------------------------------
	String GpuProgram::CmdMorph::doGet(const void* target) const
	{
		const GpuProgram* t = static_cast<const GpuProgram*>(target);
		return StringConverter::toString(t->isMorphAnimationIncluded());
	}
	void GpuProgram::CmdMorph::doSet(void* target, const String& val)
	{
		GpuProgram* t = static_cast<GpuProgram*>(target);
		t->setMorphAnimationIncluded(StringConverter::parseBool(val));
	}
	//-----------------------------------------------------------------------
	String GpuProgram::CmdPose::doGet(const void* target) const
	{
		const GpuProgram* t = static_cast<const GpuProgram*>(target);
		return StringConverter::toString(t->getNumberOfPosesIncluded());
	}
	void GpuProgram::CmdPose::doSet(void* target, const String& val)
	{
		GpuProgram* t = static_cast<GpuProgram*>(target);
		t->setPoseAnimationIncluded((ushort)StringConverter::parseUnsignedInt(val));
	}
	//-----------------------------------------------------------------------
	String GpuProgram::CmdVTF::doGet(const void* target) const
	{
		const GpuProgram* t = static_cast<const GpuProgram*>(target);
		return StringConverter::toString(t->isVertexTextureFetchRequired());
	}
	void GpuProgram::CmdVTF::doSet(void* target, const String& val)
	{
		GpuProgram* t = static_cast<GpuProgram*>(target);
		t->setVertexTextureFetchRequired(StringConverter::parseBool(val));
	}
	//-----------------------------------------------------------------------
	String GpuProgram::CmdManualNamedConstsFile::doGet(const void* target) const
	{
		const GpuProgram* t = static_cast<const GpuProgram*>(target);
		return t->getManualNamedConstantsFile();
	}
	void GpuProgram::CmdManualNamedConstsFile::doSet(void* target, const String& val)
	{
		GpuProgram* t = static_cast<GpuProgram*>(target);
		t->setManualNamedConstantsFile(val);
	}
    //-----------------------------------------------------------------------
	String GpuProgram::CmdAdjacency::doGet(const void* target) const
	{
		const GpuProgram* t = static_cast<const GpuProgram*>(target);
		return StringConverter::toString(t->isAdjacencyInfoRequired());
	}
	void GpuProgram::CmdAdjacency::doSet(void* target, const String& val)
	{
		GpuProgram* t = static_cast<GpuProgram*>(target);
		t->setAdjacencyInfoRequired(StringConverter::parseBool(val));
	}
    //-----------------------------------------------------------------------
    GpuProgramPtr& GpuProgramPtr::operator=(const HighLevelGpuProgramPtr& r)
    {
        // Can assign direct
        if (pRep == r.getPointer())
            return *this;
        release();
		// lock & copy other mutex pointer
        OGRE_MUTEX_CONDITIONAL(r.OGRE_AUTO_MUTEX_NAME)
        {
		    OGRE_LOCK_MUTEX(*r.OGRE_AUTO_MUTEX_NAME)
		    OGRE_COPY_AUTO_SHARED_MUTEX(r.OGRE_AUTO_MUTEX_NAME)
            pRep = r.getPointer();
            pUseCount = r.useCountPointer();
            if (pUseCount)
            {
                ++(*pUseCount);
            }
        }
		else
		{
			// RHS must be a null pointer
			assert(r.isNull() && "RHS must be null if it has no mutex!");
			setNull();
		}
        return *this;
    }

}