#include "stdafx.h"
#include ".\terrain.h"
#include "ngEngine.h"

Terrain::Terrain(void)
{
FVF=D3DFVF_XYZ|D3DFVF_DIFFUSE;
}

Terrain::~Terrain(void)
{
}

void Terrain::Create(ngEngine *engine,D3DXVECTOR3 StartPoint,float xSize,float zSize,int xRes,int zRes)
{
	m_pEngine=engine;
	float RowHeight=zSize/zRes;
	float ColWidth=xSize/xRes;
	CreateVertices(StartPoint,RowHeight,ColWidth,xRes,zRes);
	CreateIndices(xRes,zRes);
	ConstructBuffers();

}
void Terrain::CreateVertices(D3DXVECTOR3 StartPoint,float RowHeight,float ColWidth,int xCount,int zCount) 
{
	for(int j=0;j<=zCount;j++)   //<--for every Row do:
	{
		for(int i=0;i<=xCount;i++) //<--for every Vert do:
		{
			TerrainVert Vertex;
			Vertex.x=StartPoint.x+i*ColWidth;
			Vertex.y=StartPoint.y;            //<---Terrain Height
			Vertex.z=StartPoint.z+j*RowHeight;
			Vertex.color=0xff00ff00;
			Verts.push_back(Vertex);


		}
	}


}

void Terrain::CreateIndices(int xRes, int yRes) 
{
for(int j=0;j<=yRes-1;j++) //<--For Every Row do:
{
	for(int i=0;i<=xRes-1;i++) //<--For Every QUAD(!) do:
	{
		int Row=j*xRes;
		//First Triangle
		Indices.push_back(xRes*j+i+Row);
		Indices.push_back(i+Row);
		Indices.push_back(i+Row+1);

		//Indices.push_back(xRes*j+i+1+Row);
		//Second Triangle
		Indices.push_back(i+Row);
		Indices.push_back(i+1+Row);
		Indices.push_back(xRes*j+i+1+Row);
	}

}

}

void Terrain::ConstructBuffers() 
{

//Create VertexBuffer:

	if( FAILED( m_pEngine->g_pD3DDevice->CreateVertexBuffer(Verts.size()*sizeof(std::vector<TerrainVert>::value_type),
                                                       0,
                                                       FVF,
                                                       D3DPOOL_DEFAULT,
                                                       &pVBuffer,   //<---inherited from BaseMesh
                                                       NULL ) ) )
    {
        MessageBox(0,"Fetter Error1!","Error",0);
        PostQuitMessage(1);
    }
VOID *pVData;
pVBuffer->Lock(0,sizeof(std::vector<TerrainVert>::value_type),(void**)&pVData,0);	//lock buffer 
std::vector<TerrainVert>::pointer Vptr = &Verts[0];
memcpy(pVData,Vptr,Verts.size()*sizeof(std::vector<TerrainVert>::value_type));						//copy data to buffer
pVBuffer->Unlock();	

//Create IndexBuffer:
if(FAILED(m_pEngine->g_pD3DDevice->CreateIndexBuffer(Indices.size()*sizeof(std::vector<short>::value_type),D3DUSAGE_WRITEONLY,D3DFMT_INDEX16,D3DPOOL_MANAGED,&pIBuffer,NULL))) 
{
	MessageBox(0,"Fetter Error2!","Error",0);
	PostQuitMessage(1);
}

VOID *pIData;
pIBuffer->Lock(0,sizeof(std::vector<short>::value_type),(void**)&pIData,0);	//lock buffer 
std::vector<short>::pointer Iptr = &Indices[0];
memcpy(pIData,Iptr,Indices.size()*sizeof(std::vector<short>::value_type));	//copy data to buffer
pIBuffer->Unlock();	
}

void Terrain::render() 
{
	m_pEngine->g_pD3DDevice->SetFVF(FVF); //<---inherited from BaseMesh
	m_pEngine->g_pD3DDevice->SetStreamSource(0,pVBuffer,0,sizeof(std::vector<TerrainVert>::value_type));
	m_pEngine->g_pD3DDevice->SetIndices(pIBuffer);
	m_pEngine->g_pD3DDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,0,0,Verts.size(),0,(xDivs-1)*(zDivs-1)*2);

}

for (int j = 0; j < yRes; ++j){	for (int i = 0; i < xRes; ++i)	{		int Row = j * xRes;		//First Triangle		Indices.push_back(Row + i);		Indices.push_back(Row + i + 1);		Indices.push_back(Row + i + xRes);		//Second Triangle		Indices.push_back(Row + i + 1);		Indices.push_back(Row + i + 1 + xRes);		Indices.push_back(Row + i + xRes);	}}