/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU

http://www.genesis-3d.com.cn

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#include "stdneb.h"
#include "particles/particlesystem.h"
#include "particles/particletarget.h"
#include "particles/particle.h"

namespace Particles
{
	using namespace RenderBase;


	__ImplementClass( Particles::ParticleTarget, 'PPTG', Core::RefCounted)
		//------------------------------------------------------------------------
		ParticleTarget::ParticleTarget()
		: mParentSystem(NULL)
		, mName("Target")
		, mIsActive(false)
		, mTexRowSize(1)
		, mTexColumnSize(1)
		, mPrimDirty(false)
		, mOrientType(OT_NONE)
		, mStretchScale(1.0f)
		, mNeedPrimitive(false)
		, mCurrVertexCount(0)
		, mCurrIndexCount(0)
		, mActiveVertexCount(0)
		, mActiveIndexCount(0)
	{
		generateUVFrames();
	}
	//------------------------------------------------------------------------
	ParticleTarget::~ParticleTarget()
	{

	}
	//------------------------------------------------------------------------
	ParticleTarget::TargetType ParticleTarget::GetTargetType(void) const
	{
		return Unknown;
	}
	//------------------------------------------------------------------------
	void 
		ParticleTarget::_onActivate(void)
	{
		n_assert( !mIsActive );
		mIsActive = true;
		mPrimDirty = true;
	}
	//------------------------------------------------------------------------
	void 
		ParticleTarget::_onDeactivate(void)
	{
		n_assert( mIsActive );
		mIsActive = false;
		if (mPrimitiveHandle.IsValid())
		{
			Graphic::GraphicSystem::Instance()->RemovePrimitive(mPrimitiveHandle);
			mPrimitiveHandle = RenderBase::PrimitiveHandle();
			restActiveElemCount();
		}
	}
	//------------------------------------------------------------------------
	void 
		ParticleTarget::_updateTarget(ParticlePoolPtr& pool, Timing::Time frameTime)
	{
		n_error("ParticleTarget::_updateTarget Should impl in devired class ");
		// empty
	}
	//------------------------------------------------------------------------
	void
		ParticleTarget::CheckPrimitive(SizeT vertexCount, SizeT indexCount, SizeT& verticesSizeInByte, SizeT& indicesSizeInByte)
	{

		verticesSizeInByte = vertexCount * sizeof( ParticleVertexData );
		indicesSizeInByte = indexCount * sizeof(ushort);
		bool rebuild = false;

		if (mCurrVertexCount != vertexCount || mCurrIndexCount != indexCount)
		{
			mPrimDirty = true;
			rebuild = true;
		}
		if (rebuild)
		{
			Graphic::GraphicSystem::Instance()->RemovePrimitive(mPrimitiveHandle);

			Graphic::VertexBufferData2 vbd2;
			Graphic::IndexBufferData2 ibd2;
			_initVertexBufferData(vbd2, vertexCount);
			_initVertexBufferData(ibd2, indexCount);
			mCurrVertexCount = vertexCount;
			mCurrIndexCount = indexCount;
			mPrimitiveHandle = Graphic::GraphicSystem::Instance()->CreatePrimitiveHandle(&vbd2, &ibd2);
		}
	}
	//------------------------------------------------------------------------
	void 
		ParticleTarget::generateUVFrames(void)
	{
		n_assert( mTexRowSize >= 1 );
		n_assert( mTexColumnSize >= 1);

		SizeT numUVFrames = (mTexRowSize * mTexColumnSize);

		float animUScale = 1.0f / mTexRowSize;
		float animVScale = 1.0f / mTexColumnSize;

		if( numUVFrames == 1 )
		{
			mUVTexCoords.Clear();
		}
		else
		{
			if ( mUVTexCoords.Size() < numUVFrames )
			{
				mUVTexCoords.Reserve( numUVFrames - mUVTexCoords.Size() );
			}
			mUVTexCoords.Resize(numUVFrames, UVRect() );

			for( IndexT index=0;index < numUVFrames; ++index )
			{
				IndexT vIdx = index / mTexRowSize;
				IndexT uIdx = index - vIdx * mTexRowSize;	

				Math::scalar uOffset = (Math::scalar)uIdx * animUScale;
				Math::scalar vOffset = (Math::scalar)vIdx * animVScale;

				mUVTexCoords[index].x = uOffset;
				mUVTexCoords[index].y = vOffset;
				mUVTexCoords[index].width = animUScale;
				mUVTexCoords[index].height = animVScale;
			}
		}
	}
	//------------------------------------------------------------------------
	Math::bbox 
		ParticleTarget::computerBoundingBox( ParticleVertexData* particleVertex,  SizeT numVertex ) const
	{
		n_assert( particleVertex );
		Math::bbox bb;
		bb.begin_extend();	
		Math::float3 pos = mParentSystem->GetDerivedPosition();
		bb.extend(Math::point(pos.x(),pos.y(),pos.z()));
		for ( IndexT i = 0; i < numVertex; ++i)
		{	
			bb.extend( Math::point( particleVertex->mPosition.x(), 
				particleVertex->mPosition.y(),
				particleVertex->mPosition.z() ) );
			++particleVertex;
		}
		bb.end_extend();
		return bb;
	}
	//-----------------------------------------------------------------------------
	void ParticleTarget::_RotatorParticle(Particle* particle, ParticleVertexData* particleVertex)
	{
		Math::vector _axis(particleVertex->mNormal.x(),
			particleVertex->mNormal.y(),
			particleVertex->mNormal.z());
		Math::quaternion rq = Math::quaternion::rotationaxis( _axis , particle->mZRotation  );
		Math::matrix44 _mat = Math::matrix44::identity().rotationquaternion(rq);

		Math::float3 vPos = mParentSystem->IsMoveWorldCoord()?particle->mPosition :
			particle->mPosition.transformPoint(mParentSystem->GetWorldMatrix());

		SizeT n = 0;
		while (n<4)
		{
			Math::float3 tempos = particleVertex[n].mPosition - vPos;
			tempos = tempos.transformPoint(_mat);
			particleVertex[n].mPosition = tempos+vPos;
			n++;
		}		
	}
	void ParticleTarget::restActiveElemCount()
	{
		mPrimDirty = (mActiveIndexCount != 0);
		mActiveVertexCount = 0;
		mActiveIndexCount = 0;
		mCurrIndexCount = 0;
		mCurrVertexCount = 0;
	}
	//--------------------------------------------------------------------------------
	Math::MinMaxCurve*  ParticleTarget::getMinMaxCurve(ParticleCurveType pct)
	{
		return NULL;
	}
	void ParticleTarget::_initVertexBufferData(Graphic::VertexBufferData2& vbd2, SizeT needCount)
	{
		Util::Array<RenderBase::VertexComponent>& verDeclare = vbd2.GetVertexComponents();
		verDeclare.Append( VertexComponent(VertexComponent::Color,0, VertexComponent::ColorBGRA) );
		verDeclare.Append( VertexComponent(VertexComponent::Position,0, VertexComponent::Float3) );
		verDeclare.Append( VertexComponent(VertexComponent::Normal,0, VertexComponent::Float3) );
		verDeclare.Append( VertexComponent(VertexComponent::TexCoord, 0, VertexComponent::Float2) );

		vbd2.Setup(needCount, sizeof(ParticleVertexData), RenderBase::BufferData::Dynamic,RenderBase::PrimitiveTopology::TriangleList, false);
	}
	void ParticleTarget::_initSimpleGPUVertexBuffer(Graphic::VertexBufferData2& vbd2, SizeT needCount)
	{
		Util::Array<RenderBase::VertexComponent>& verDeclare = vbd2.GetVertexComponents();
		verDeclare.Append( VertexComponent(VertexComponent::Color,0, VertexComponent::ColorBGRA) );
		verDeclare.Append( VertexComponent(VertexComponent::Position,0, VertexComponent::Float3) );
		verDeclare.Append( VertexComponent(VertexComponent::Normal,0, VertexComponent::Float3) );
		verDeclare.Append( VertexComponent(VertexComponent::TexCoord, 0, VertexComponent::Float2) );
		verDeclare.Append( VertexComponent(VertexComponent::Size, 0, VertexComponent::Float) );
		vbd2.Setup(needCount, sizeof(SimpleGPUParticleVertex), RenderBase::BufferData::Dynamic,RenderBase::PrimitiveTopology::PointList, false);
	}
	void ParticleTarget::_initAffectGPUVertexBuffer(Graphic::VertexBufferData2& vbd2, SizeT needCount)
	{
		Util::Array<RenderBase::VertexComponent>& verDeclare = vbd2.GetVertexComponents();
		verDeclare.Append( VertexComponent(VertexComponent::Color,0, VertexComponent::ColorBGRA) );
		verDeclare.Append( VertexComponent(VertexComponent::Tangent,0, VertexComponent::Float4) );
		verDeclare.Append( VertexComponent(VertexComponent::Position,0, VertexComponent::Float3) );
		verDeclare.Append( VertexComponent(VertexComponent::Normal,0, VertexComponent::Float3) );
		verDeclare.Append( VertexComponent(VertexComponent::TexCoord, 0, VertexComponent::Float2) );
		verDeclare.Append( VertexComponent(VertexComponent::Size, 0, VertexComponent::Float) );
		vbd2.Setup(needCount, sizeof(SimpleGPUParticleVertex), RenderBase::BufferData::Dynamic,RenderBase::PrimitiveTopology::PointList, false);
	}
	void ParticleTarget::_initVertexBufferData(Graphic::IndexBufferData2& ibd2, SizeT needCount)
	{
		ibd2.Setup(needCount, RenderBase::BufferData::Dynamic, RenderBase::IndexBufferData::Int16, false);
	}
}