// TerrainPatch.cpp: implementation of the CTerrainPatch class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "TerrainPatch.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CTerrainPatch::SSoftwareTransformPatch::SSoftwareTransformPatch()
{
	__Initialize();	
}

CTerrainPatch::SSoftwareTransformPatch::~SSoftwareTransformPatch()
{
	Destroy();
}

void CTerrainPatch::SSoftwareTransformPatch::Create()
{
	assert(NULL==m_akTerrainVertex);
	m_akTerrainVertex=new SoftwareTransformPatch_SSourceVertex[TERRAIN_VERTEX_COUNT];
}

void CTerrainPatch::SSoftwareTransformPatch::Destroy()
{
	if (m_akTerrainVertex)
		delete [] m_akTerrainVertex;

	__Initialize();
}

void CTerrainPatch::SSoftwareTransformPatch::__Initialize()
{
	m_akTerrainVertex=NULL;
}

bool CTerrainPatch::SOFTWARE_TRANSFORM_PATCH_ENABLE=TRUE;

void CTerrainPatch::Clear()
{
	m_kHT.m_kVB.Destroy();
	m_kST.Destroy();
	
	m_WaterVertexBuffer.Destroy();
	ClearID();
	SetUse(false);

	m_bWaterExist = false;
	m_bNeedUpdate = true;

	m_dwWaterPriCount = 0;
	m_byType = PATCH_TYPE_PLAIN;
	
	m_fMinX = m_fMaxX = m_fMinY = m_fMaxY = m_fMinZ = m_fMaxZ = 0.0f;

	m_dwVersion=0;
}

void CTerrainPatch::BuildWaterVertexBuffer(SWaterVertex* akSrcVertex, UINT uWaterVertexCount)
{
	CGraphicVertexBuffer& rkVB=m_WaterVertexBuffer;

	if (!rkVB.Create(uWaterVertexCount, D3DFVF_XYZ | D3DFVF_DIFFUSE, D3DUSAGE_WRITEONLY, D3DPOOL_MANAGED)) 
		return;
	
	SWaterVertex* akDstWaterVertex;
	if (rkVB.Lock((void **) &akDstWaterVertex))
	{
		UINT uVBSize=sizeof(SWaterVertex)*uWaterVertexCount;
		memcpy(akDstWaterVertex, akSrcVertex, uVBSize);
		m_dwWaterPriCount=uWaterVertexCount/3;

		rkVB.Unlock();		
	}	
}
		
void CTerrainPatch::BuildTerrainVertexBuffer(HardwareTransformPatch_SSourceVertex* akSrcVertex)
{
	if (SOFTWARE_TRANSFORM_PATCH_ENABLE)
		__BuildSoftwareTerrainVertexBuffer(akSrcVertex);
	else
		__BuildHardwareTerrainVertexBuffer(akSrcVertex);
}

void CTerrainPatch::__BuildSoftwareTerrainVertexBuffer(HardwareTransformPatch_SSourceVertex* akSrcVertex)
{
	//DWORD dwVBSize=sizeof(HardwareTransformPatch_SSourceVertex)*TERRAIN_VERTEX_COUNT;

	m_kST.Create();

	SoftwareTransformPatch_SSourceVertex* akDstVertex=SoftwareTransformPatch_GetTerrainVertexDataPtr();
	for (UINT uIndex=0; uIndex!=TERRAIN_VERTEX_COUNT; ++uIndex)
	{
		*((HardwareTransformPatch_SSourceVertex*)(akDstVertex+uIndex))=*(akSrcVertex+uIndex);
		akDstVertex[uIndex].dwDiffuse=0xFFFFFFFF;
	}
}

void CTerrainPatch::__BuildHardwareTerrainVertexBuffer(HardwareTransformPatch_SSourceVertex* akSrcVertex)
{
	
	CGraphicVertexBuffer& rkVB=m_kHT.m_kVB;
	if (!rkVB.Create(TERRAIN_VERTEX_COUNT, D3DFVF_XYZ | D3DFVF_NORMAL, D3DUSAGE_WRITEONLY, D3DPOOL_MANAGED)) 
		return;
	
	HardwareTransformPatch_SSourceVertex* akDstVertex;
	if (rkVB.Lock((void **) &akDstVertex))
	{
		UINT uVBSize=sizeof(HardwareTransformPatch_SSourceVertex)*TERRAIN_VERTEX_COUNT;
	
		memcpy(akDstVertex, akSrcVertex, uVBSize);
		rkVB.Unlock();		
	}
}

void CTerrainPatch::SoftwareTransformPatch_UpdateTerrainLighting(DWORD dwVersion, const D3DLIGHT8& c_rkLight, const D3DMATERIAL8& c_rkMtrl)
{
	if (m_dwVersion==dwVersion)
		return;

	m_dwVersion=dwVersion;
	
	SoftwareTransformPatch_SSourceVertex* akSrcVertex=SoftwareTransformPatch_GetTerrainVertexDataPtr();
	if (!akSrcVertex)
		return;
	
	D3DXVECTOR3 kLightDir=c_rkLight.Direction;	


	DWORD dwDot;	
	DWORD dwAmbientR=(c_rkMtrl.Ambient.r*c_rkLight.Ambient.r+c_rkMtrl.Emissive.r)*255.0f;
	DWORD dwAmbientG=(c_rkMtrl.Ambient.g*c_rkLight.Ambient.g+c_rkMtrl.Emissive.g)*255.0f;
	DWORD dwAmbientB=(c_rkMtrl.Ambient.b*c_rkLight.Ambient.b+c_rkMtrl.Emissive.b)*255.0f;
	DWORD dwDiffuseR=(c_rkMtrl.Diffuse.r*c_rkLight.Diffuse.r)*255.0f;
	DWORD dwDiffuseG=(c_rkMtrl.Diffuse.g*c_rkLight.Diffuse.g)*255.0f;
	DWORD dwDiffuseB=(c_rkMtrl.Diffuse.b*c_rkLight.Diffuse.b)*255.0f;

	if (dwDiffuseR>255-dwAmbientR)
		dwDiffuseR=255-dwAmbientR;

	if (dwDiffuseG+dwAmbientG>255)
		dwDiffuseG=255-dwAmbientG;

	if (dwDiffuseB+dwAmbientB>255)
		dwDiffuseB=255-dwAmbientB;

	for (UINT uIndex=0; uIndex!=CTerrainPatch::TERRAIN_VERTEX_COUNT; ++uIndex)
	{
		float fDot=D3DXVec3Dot(&akSrcVertex[uIndex].kNormal, &kLightDir);

		const float N=0xffffff;
		const int S=24;
		if (fDot<0.0f) 
			dwDot=(N*-fDot);
		else
			dwDot=(N*+fDot);
		
		akSrcVertex[uIndex].dwDiffuse=(0xff000000)|
			(((dwDiffuseR*dwDot>>S)+dwAmbientR)<<16)|
			(((dwDiffuseG*dwDot>>S)+dwAmbientG)<<8)|
			((dwDiffuseB*dwDot>>S)+dwAmbientB);
	}

}

UINT CTerrainPatch::GetWaterFaceCount()
{
	return m_dwWaterPriCount;
}

CTerrainPatchProxy::CTerrainPatchProxy()
{
	Clear();
}

CTerrainPatchProxy::~CTerrainPatchProxy()
{
	Clear();
}

void CTerrainPatchProxy::SetCenterPosition(const D3DXVECTOR3& c_rv3Center)
{
	m_v3Center=c_rv3Center;
}

bool CTerrainPatchProxy::IsIn(const D3DXVECTOR3& c_rv3Target, float fRadius)
{
	float dx=m_v3Center.x-c_rv3Target.x;
	float dy=m_v3Center.y-c_rv3Target.y;
	float fDist=dx*dx+dy*dy;
	float fCheck=fRadius*fRadius;

	if (fDist<fCheck)
		return true;

	return false;
}

void CTerrainPatchProxy::SoftwareTransformPatch_UpdateTerrainLighting(DWORD dwVersion, const D3DLIGHT8& c_rkLight, const D3DMATERIAL8& c_rkMtrl)
{
	if (m_pTerrainPatch)
		m_pTerrainPatch->SoftwareTransformPatch_UpdateTerrainLighting(dwVersion, c_rkLight, c_rkMtrl);	
}

CGraphicVertexBuffer* CTerrainPatchProxy::HardwareTransformPatch_GetVertexBufferPtr()
{
	if (m_pTerrainPatch)
		return m_pTerrainPatch->HardwareTransformPatch_GetVertexBufferPtr();

	return NULL;
}

SoftwareTransformPatch_SSourceVertex* CTerrainPatchProxy::SoftwareTransformPatch_GetTerrainVertexDataPtr()
{
	if (m_pTerrainPatch)
		return m_pTerrainPatch->SoftwareTransformPatch_GetTerrainVertexDataPtr();
	
	return NULL;
}

UINT CTerrainPatchProxy::GetWaterFaceCount()
{
	if (m_pTerrainPatch)
		return m_pTerrainPatch->GetWaterFaceCount();
	
	return 0;
}

void CTerrainPatchProxy::Clear()
{
	m_bUsed = false;
	m_sPatchNum = 0;
	m_byTerrainNum = 0xFF;

	m_pTerrainPatch = NULL;
}