/****************************************************************************
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****************************************************************************/

#include "stdneb.h"
#include "VegetationRenderObject.h"
#include "vegetation/VegetationObejct.h"
#include "graphicsystem/Camera/RenderPipeline/RenderData.h"
#include "graphicsystem/Material/Material.h"
#include "graphicsystem/GraphicSystem.h"
#include "graphicsystem/Renderable/GraphicRenderer.h"
#include "graphicsystem/Material/materialinstance.h"
#include "shadercompiler/ShaderMarcro.h"
#include "graphicsystem/Vision/RenderScene.h"
namespace Vegetation
{
	__ImplementClass(VegetationRenderObject,'VROB',Graphic::RenderObject)

		using namespace Graphic;
	VegetationRenderObject::VegetationRenderObject()
	{

	}
	VegetationRenderObject::~VegetationRenderObject()
	{

	}
	void VegetationRenderObject::AddToCollection(Graphic::RenderDataCollection* collection, const Graphic::RenderConfig* renderConfig)
	{
		const Graphic::RenderableResUnitArray& list = mOwner->GetResUnits();
		Graphic::RenderableResUnitArray::Iterator begin = list.Begin();
		Graphic::RenderableResUnitArray::Iterator end = list.End();
		while(begin != end)
		{
			if (begin->Complete())
			{
				Graphic::Renderable* pRenderable = begin->GetRenderable();
				SetShaderMask(pRenderable);
				collection->Push(pRenderable);
			}
			++begin;
		}
	}

	void VegetationRenderObject::Render(const Renderable* renderable, RenderPassType passType, const Material* customizedMaterial)
	{
		n_assert(renderable);
		const RenderableType* grassRenderable = renderable->cast_fast<const RenderableType>();
		switch(mOwner->GetRenderType())
		{
		case eRT_Grass:
			_RenderGrass(grassRenderable, passType, customizedMaterial);
			break;
		case eRT_DetailMesh:
		case eRT_Tree:
			_RenderTree(grassRenderable, passType, customizedMaterial);
			break;
		default:
			break;
		}	
	}
	//--------------------------------------------------------------------------------
	void VegetationRenderObject::_RenderTree(const RenderableType* renderable, RenderPassType passType, const Material* customizedMaterial)
	{
		// TODO : if renderable submesh is 0, render the bole, 1 is leaves pieces

		if (mOwner->GetPrimHandle().IsValid())
		{
			GlobalMaterialParam* pGMP = Material::GetGlobalMaterialParams();

			//TODO:: 			
			//camera cull
			const Math::matrix44* camera = &(Graphic::GraphicSystem::Instance()->GetRenderingCamera()->GetTransform());		
			GPtr<Vegetation::VegeInstanceMap> pInstMap = mOwner->GetInstanceMap();
			if ( !pInstMap.isvalid())
				return;

			Math::vector objscale =  mOwner->GetScale();
			Math::quaternion objrot =  mOwner->GetRotation();

			Math::scalar fCullDistance = mOwner->GetCullDistance();

			SizeT nInstCount = pInstMap->GetInstanceCount();
			for (SizeT i = 0; i	< nInstCount; ++i)
			{
				INSTANCEDATA_POS* tmpInst = pInstMap->GetInstance(i);

				Math::float4 _pos(tmpInst->pos.x(),tmpInst->pos.y(), tmpInst->pos.z(), 1);

				Math::float4 fDistance = camera->get_position() - _pos;

				// while in the visual range , draw a single Tree 
				if ( fDistance.length() < fCullDistance )
				{				

					Math::quaternion _quat = Math::quaternion::rotationyawpitchroll( tmpInst->rotate.y() * N_PI / 180 , tmpInst->rotate.x()* N_PI / 180, tmpInst->rotate.z()* N_PI / 180);
					_quat = Math::quaternion::multiply(_quat,objrot);
					Math::float4 _scale = Math::float4(tmpInst->scale.x() * objscale.x(), tmpInst->scale.y()* objscale.y(), tmpInst->scale.z()* objscale.z(), 0);
					Math::matrix44 _mat = Math::matrix44::transformation( _scale, _quat, _pos );


					Math::float4 tempRegst = Math::float4(tmpInst->color, tmpInst->wave, 0, 0);
					int startIndex = 13;
					GraphicSystem::Instance()->SetVertexShaderConstantVectorF(startIndex, &tempRegst, 1);

					const Graphic::Camera* pCamera = Graphic::GraphicSystem::Instance()->GetRenderingCamera();

					Math::matrix44 mvp = Math::matrix44::multiply(pCamera->GetViewProjTransform(), _mat);
					pGMP->SetMatrixParam(eGShaderMatMVP, mvp);
					pGMP->SetMatrixParam(eGShaderMatM, _mat);

					Math::matrix44 Inverse, InvTranspose;
					Inverse      = Math::matrix44::inverse(_mat);
					InvTranspose = Math::matrix44::transpose(Inverse);

					pGMP->SetMatrixParam(eGShaderMatInverseM,Inverse);
					pGMP->SetMatrixParam(eGShaderMatInverseTransposeM,InvTranspose);

					_Render(renderable, passType,//mat, passType, 
						mOwner->GetPrimHandle(),	
						renderable->GetFirstVertix(),
						renderable->GetNumVertex(),
						renderable->GetFirstIndex(),
						renderable->GetNumIndex(),
						customizedMaterial);						
				}
			}	
		}
	}

	//--------------------------------------------------------------------------------
	void VegetationRenderObject::_RenderGrass(const RenderableType* renderable, Graphic::RenderPassType passType, const Graphic::Material* customizedMaterial)
	{		

		if (mOwner->GetPrimHandle().IsValid())
		{
			GlobalMaterialParam* pGMP = Material::GetGlobalMaterialParams();

			//TODO:: 			
			//camera cull
			const Camera* renderingCamera = Graphic::GraphicSystem::Instance()->GetRenderingCamera();
			const Math::matrix44* camera = &(renderingCamera->GetTransform());	
			Math::vector objscale =  mOwner->GetScale();
			Math::quaternion objrot =  mOwner->GetRotation();

			GPtr<Vegetation::VegeInstanceMap>& pInstMap = mOwner->GetInstanceMap();

			if ( !pInstMap.isvalid())
				return;

			Math::scalar fCullDistance = mOwner->GetCullDistance();

			if ( pInstMap->IsHWInstancing() )
			{
				n_assert(0);

				return;
			}	
			else
			{
				SizeT nTotalCount = pInstMap->GetInstanceCount();
				SizeT nVisualIndex = 0;	
				Util::Array<Math::matrix44> grassMatArray;

				for (SizeT i = 0; i < nTotalCount; ++i)
				{

					INSTANCEDATA_POS* tmpInst = pInstMap->GetInstance(i);

					Math::float4 _pos(tmpInst->pos.x(), tmpInst->pos.y(), tmpInst->pos.z(),1);	

					Math::float4 fDistance = camera->get_position() - _pos;
					//max value 1000f, should be set outside
					if ( fDistance.length() < fCullDistance )
					{
						Math::quaternion _quat = Math::quaternion::rotationyawpitchroll( tmpInst->rotate.y()* N_PI / 180 , tmpInst->rotate.x()* N_PI / 180, tmpInst->rotate.z()* N_PI / 180);
						Math::float4 _scale = Math::float4(tmpInst->scale.x() , tmpInst->scale.y() , tmpInst->scale.z() , 0);
						Math::matrix44 _mat = Math::matrix44::transformation( _scale, _quat, _pos );

						if (customizedMaterial)
						{
							//TODO:  while WireFrame mode : need to calculate the Matrix at here ,because the shader will has not the calculation step
							const Graphic::Camera* pCamera = Graphic::GraphicSystem::Instance()->GetRenderingCamera();
							Math::matrix44 mvp = Math::matrix44::multiply(pCamera->GetViewProjTransform(), _mat);
							pGMP->SetMatrixParam(eGShaderMatMVP, mvp);
							pGMP->SetMatrixParam(eGShaderMatM, _mat);

							_Render(renderable, passType,
								mOwner->GetPrimHandle(),			
								renderable->GetFirstVertix(),
								renderable->GetNumVertex(),
								renderable->GetFirstIndex(),
								renderable->GetNumIndex(),
								customizedMaterial);
						}
						else
						{
							float4 tfloat4 = _mat.getrow3();
							tfloat4.x() = tmpInst->color;
							tfloat4.y() = tmpInst->wave; 
							tfloat4.z() = _scale.y(); 
							_mat.setrow3(tfloat4);
							grassMatArray.Append(_mat);
						}
						++nVisualIndex;
					}					

				}

				if (customizedMaterial)
					return;

				bool meshRT = (eRT_DetailMesh == mOwner->GetRenderType());
				SizeT vertLimitCount = pInstMap->GetVertLimitCount();
				SizeT nremainingInst = nVisualIndex;				
				while ( nremainingInst > 0 )
				{
					SizeT nRenderIndicesCount =  Math::n_min(nremainingInst, g_nNumBatchInstance);
					if (meshRT)
						nRenderIndicesCount = Math::n_min(nRenderIndicesCount, vertLimitCount);


					SizeT nRenderVertInst =  Math::n_min(nremainingInst, vertLimitCount);
					nRenderVertInst =  Math::n_min(nRenderVertInst, nRenderIndicesCount);

					SizeT nbegin = nVisualIndex - nremainingInst;

					//TODO : DrawPrimitive
					if ( grassMatArray.Size() > 0 )
					{
						int startIndex = 0;
						if (meshRT)
							startIndex = 12;			
						else
							startIndex = 12;
						GraphicSystem::Instance()->SetVertexShaderConstantMatrixF(startIndex, &grassMatArray[nbegin], nRenderIndicesCount);	
					}		

					const Graphic::Camera* pCamera = Graphic::GraphicSystem::Instance()->GetRenderingCamera();

					Math::matrix44 mvp = Math::matrix44::multiply(pCamera->GetViewProjTransform(), matrix44::identity());
					pGMP->SetMatrixParam(eGShaderMatMVP, mvp);

					pGMP->SetMatrixParam(eGShaderMatM, matrix44::identity());

					_Render(renderable, passType,//mat, passType, 
						mOwner->GetPrimHandle(),			
						renderable->GetFirstVertix(),
						nRenderVertInst * renderable->GetNumVertex(),
						nbegin * renderable->GetNumIndex(),
						nRenderIndicesCount * renderable->GetNumIndex(),
						customizedMaterial);
					nremainingInst -= nRenderIndicesCount;
				}

			}		
		}

	}

	//--------------------------------------------------------------------------------
	void VegetationRenderObject::_Render(const RenderableType* renderable, Graphic::RenderPassType passType, const RenderBase::PrimitiveHandle& handle, 
		IndexT firstVert, SizeT numVert, IndexT firstIndex, SizeT numIndex, const Graphic::Material* customizedMaterial)
	{
		const Graphic::Material* material = (NULL == customizedMaterial) ? renderable->GetMaterial() : customizedMaterial;
		if (passType && material->GetTech()->IsTemplateTech())
		{

			GraphicRenderer::RenderForward(passType, renderable, handle, firstVert, numVert, firstIndex, numIndex, customizedMaterial);
		}
		else
		{
			GraphicRenderer::RenderForward(eForward, renderable, handle, firstVert, numVert, firstIndex, numIndex, customizedMaterial);
		}
	}
	//--------------------------------------------------------------------------------
	void VegetationRenderObject::SetShaderMask(Graphic::Renderable* pRenderable)
	{
		const Graphic::MaterialInstance* material_instance = pRenderable->GetMaterial();

		//打开forward pass 里用到的 宏
		const Util::Array< GPtr<Graphic::MaterialPass> >& passList = material_instance->GetTech()->GetPassList();
		const GPtr<Graphic::MaterialPass>& pass = passList[Graphic::eForward - 1];
		const GPtr<ShaderProgramCompiler::ShaderMarcro>& pMarcro = pass->GetShaderMarcro();
		bool bTemplate = material_instance->GetTech()->IsTemplateTech();

		pMarcro->Reset();
		pRenderable->ResetShaderMask();

		if (bTemplate)
		{
			
			if (this->IsUseLM() && this->IsLMHandleValid())
			{
				pMarcro->TurnOn(ShaderProgramCompiler::ShaderMarcro::m_sLightMap);
			}

			const Graphic::Light* pSunLight = m_pRenderScene->GetSunLight();
			if (this->GetReceiveShadow() && pSunLight != NULL)
			{

				if (pSunLight->IsEnableShadow())
				{
					pMarcro->TurnOn(ShaderProgramCompiler::ShaderMarcro::m_sShadow);
				}

			}

			if (m_pRenderScene->HasLight())
			{
				pMarcro->TurnOnLight();
			}

			if (m_pRenderScene->GetEnvironment()->fogColor.w() > 0.0f)
			{
				pMarcro->TurnOn(ShaderProgramCompiler::ShaderMarcro::m_sFog);
			}

			pRenderable->SetShaderMask(Graphic::eForward, pMarcro->GetShaderMask());
		}
	}
}