genesis-3d_engine/Engine/addons/vegetation/TreeInstanceMap.cc

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

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#include "stdneb.h"
#include "vegetation/TreeInstanceMap.h"
#include "vegetation/VegetationObejct.h"

namespace Vegetation
{	

	using namespace RenderBase;
	using namespace Math;

	__ImplementClass( Vegetation::TreeInstanceMap, 'VTIM', Vegetation::VegeInstanceMap);


	TreeInstanceMap::TreeInstanceMap():VegeInstanceMap()
	{		
		//m_Name = Util::String("TreeInstanceMap");
	}

	//------------------------------------------------------------------------
	TreeInstanceMap::~TreeInstanceMap()
	{

	}
	//------------------------------------------------------------------------
	bool TreeInstanceMap::BuildPrimitive()
	{
		if ( !mVegeObject)
			return false;	

		const Resources::PrimitiveResInfo* pMeshInfo = mVegeObject->GetMeshInfo();
		if ( !pMeshInfo->GetRes())
			return false;

		const GPtr<Resources::MeshRes>& pMesh = pMeshInfo->GetRes().downcast<Resources::MeshRes>();
		// must has vertex and index
		if ( pMesh->GetIndexCount() == 0 
			|| pMesh->GetVertexCount() == 0 
			|| pMesh->GetTopologyType() == RenderBase::PrimitiveTopology::InvalidPrimitiveTopology )
		{
			return false;
		}

		//MeshInstance can only have m_nVertLimitCount = 1 and m_nInstUsingCount = 1
		m_bHWInstancing = false;
		m_nInstUsingCount = 1;
		m_nVertLimitCount = 1;

		RenderBase::PrimitiveHandle handle =  App::GraphicObjectManager::Instance()->CreatePrimitiveHandle(pMesh);

		RenderBase::PrimitiveHandle& old = mVegeObject->GetPrimHandle();
		if (old.IsValid())
		{
			App::GraphicObjectManager::Instance()->DiscardPrimitiveHandle(old);//Graphic::GraphicSystem::Instance()->RemovePrimitive(old);
		}
		mVegeObject->SetPrimHandle(handle);

		SetDirty(false);
		return true;
	}

	//------------------------------------------------------------------------
	void TreeInstanceMap::_GenerateVertex(const GPtr<Resources::MeshRes>& pMesh, VEGE_VERTEX_INSTANCE* vertext, ushort* indices,  const INSTANCEDATA_POS& InstPos, IndexT instIndex)
	{
		n_assert( pMesh.isvalid() );
		for ( IndexT index = 0; index < m_vVerDeclare.Size(); ++index )
		{
			_CopyVBOComponent(pMesh, m_vVerDeclare[index], (uchar*)vertext, sizeof(VEGE_VERTEX_INSTANCE), pMesh->GetVertexCount());
		}
	}
	//------------------------------------------------------------------------
	uchar* TreeInstanceMap::_CopyVBOData(const GPtr<MeshRes> &pMesh, const Util::Array<VertexComponent> &verDeclare, SizeT &vertexDataSize)
	{
		n_assert( pMesh.isvalid() );
		n_assert( !verDeclare.IsEmpty() );
		SizeT numVertices = pMesh->GetVertexCount();
		n_assert( numVertices > 0 );

		SizeT VertexSize = 0;
		for ( IndexT index = 0; index < verDeclare.Size(); ++index )
		{
			VertexSize += verDeclare[index].GetByteSize();
		}
		n_assert( VertexSize > 0 );

		vertexDataSize = VertexSize * numVertices ;

		uchar* vertexDataPtr = n_new_array(uchar,vertexDataSize);
		n_assert( vertexDataPtr );

		uchar* vetTemp = vertexDataPtr;

		for ( IndexT index = 0; index < verDeclare.Size(); ++index )
		{
			_CopyVBOComponent(pMesh, verDeclare[index], vetTemp, VertexSize, numVertices);

		}		

		return vertexDataPtr;
	}
	//------------------------------------------------------------------------
	void TreeInstanceMap::_CopyVBOComponent(const GPtr<MeshRes> &pMesh, const VertexComponent &vcdef, uchar *vertexDataPtr, SizeT VertexSize, SizeT numVertices)
	{
		switch( vcdef.GetSemanticName() )
		{
		case VertexComponent::Position:
			{
				PositionData::Elem* elem = pMesh->GetVertexData<PositionData>();
				n_assert( vcdef.GetByteSize() == 12 );
				StripeCopy<PositionData::Elem,12>(elem, vertexDataPtr, VertexSize, vcdef.GetByteOffset(), numVertices );

			}
			break;
		case VertexComponent::Normal:
			{
				NormalData::Elem* elem = pMesh->GetVertexData<NormalData>();
				n_assert( vcdef.GetByteSize() == 12 );
				StripeCopy<NormalData::Elem,12>(elem, vertexDataPtr, VertexSize, vcdef.GetByteOffset(), numVertices );

			}
			break;
		case VertexComponent::Tangent:
			{
				TangentData::Elem* elem = pMesh->GetVertexData<TangentData>();
				n_assert( vcdef.GetByteSize() == 16 );
				StripeCopy<TangentData::Elem,16>(elem, vertexDataPtr, VertexSize, vcdef.GetByteOffset(), numVertices );
			}
			break;
		case VertexComponent::Binormal:
			{
				BiNormalData::Elem* elem = pMesh->GetVertexData<BiNormalData>();
				n_assert( vcdef.GetByteSize() == 16 );
				StripeCopy<BiNormalData::Elem,16>(elem, vertexDataPtr, VertexSize, vcdef.GetByteOffset(), numVertices );
			}
			break;
		case VertexComponent::TexCoord:
			{
				if ( vcdef.GetSemanticIndex() == 1 )
				{
					//Temporary Code
					//Math::scalar fBatch = 0.f;
					Math::float2 IndexWave(0.f, Math::n_rand(0.5,1.0f));
					StripeCopyValue<Math::float2,sizeof(Math::float2)>(&IndexWave, vertexDataPtr, VertexSize,vcdef.GetByteOffset(), numVertices );

				}
				else
				{
					TexCoordData::Elem* elem = pMesh->GetVertexData<TexCoordData>( vcdef.GetSemanticIndex() );
					n_assert( vcdef.GetByteSize() == 8 );
					StripeCopy<TexCoordData::Elem,8>(elem, vertexDataPtr, VertexSize, vcdef.GetByteOffset(), numVertices );

				}
			}
			break;
		case VertexComponent::Color:
			{
				ColorData::Elem* elem = pMesh->GetVertexData<ColorData>( vcdef.GetSemanticIndex() );

				n_assert( vcdef.GetByteSize() == 4 );
				if ( vcdef.GetFormat() == VertexComponent::ColorRGBA )
				{
					StripeCopy<ColorData::Elem,4>(elem, vertexDataPtr, VertexSize, vcdef.GetByteOffset(), numVertices );
				}
				else if(  vcdef.GetFormat() == VertexComponent::ColorBGRA )
				{
					StripeSwapCopyColor<ColorData::Elem,4>(elem, vertexDataPtr, VertexSize, vcdef.GetByteOffset(), numVertices );
					//StripeCopy<ColorData::Elem,4>(elem, vertexDataPtr, VertexSize, vcdef.GetByteOffset(), numVertices );
				}
				else
				{
					n_assert(" GraphicObjectManager|copyVBOComponent: unknown color format" );
				}

			}
			break;
		case VertexComponent::SkinJIndices:
			{
				BoneInfoData::Elem* elem = pMesh->GetVertexData<BoneInfoData>( vcdef.GetSemanticIndex() );

				n_assert( vcdef.GetByteSize() == 8 );
				StripeCopy<BoneInfoData::Elem,24>(elem, vertexDataPtr, VertexSize, vcdef.GetByteOffset(), numVertices );

				//m_BoneInfoIndex = vcdef.GetSemanticIndex();
			}
			break;
		case VertexComponent::SkinWeights:
			{
				n_assert( vcdef.GetByteSize() == 16 );
			}
			break;
		default:
			n_error("GraphicObjectManager|copyVBOComponent: invalid VertexComponent::SemanticName/n");
		}
		return;
	}
	//------------------------------------------------------------------------
	void TreeInstanceMap::Update()
	{
		if ( !mVegeObject || mInstances.IsEmpty())
			return;	


		if ( m_bInstDirty )
		{
			BuildPrimitive();	
		}	
	}	
}