mesh.cpp

DirectInput的基本实现 只是基本应用

#include "Mesh.h"

Mesh::Mesh(LPDIRECT3DDEVICE9 pDev,WORD size,WORD pCol,WORD pRow,LPSTR Texmap) 
{
	m_pd3dDevice=pDev;
	this->m_Size =size;//一行有多少个格

	//加载地形纹理图
	D3DXCreateTextureFromFile( m_pd3dDevice, Texmap, &m_pDTex);

	m_Col = pCol;				
	m_Row = pRow;	
	this->m_dwNumOfVertices =(m_Col+1)*(m_Row+1);//4行，4列，就是每行，每列都有5个顶点，总共25个顶点
	this->m_dwNumOfPolygons =m_Col*m_Row*2;
	this->m_dwNumOfIndices =this->m_dwNumOfPolygons *3;
}

Mesh::~Mesh() 
{
	m_pDTex->Release ();
	m_pMesh->Release ();
}

HRESULT Mesh::Initilise() 
{
	D3DXCreateMeshFVF(this->m_dwNumOfPolygons,this->m_dwNumOfVertices,D3DXMESH_MANAGED,TERRAIN_D3DFVF_CUSTOMVERTEX ,m_pd3dDevice,&m_pMesh);
	//根据给定的灵活顶点格式来创建模型，返回的模型指针指向这个模型的首地址
	this->InitVertex ();
	this->InitIndex ();
	return S_OK;
}

HRESULT Mesh::InitVertex ()
{
	TERRAIN_CUSTOMVERTEX* pcvVertices;
	m_pMesh->LockVertexBuffer (0,(void**)&pcvVertices);
//============================创建一个平面＝＝＝＝＝＝＝＝＝＝＝＝
	float x, z;
	DWORD i=0;
	//把地图放在中心
	float zStart	= (float)(0.0 - (m_Row/2.0));
	float zEnd		= (float)(m_Row/2.0);
	float xStart	= (float)(0.0 - (m_Col/2.0));
	float xEnd		= (float)(m_Col/2.0);

	//清除内存，设置顶点
	int m=0,n=0;   //m,n控制行和列
	for(z = zStart; z <= zEnd; z++)
	{
		for(x = xStart; x <= xEnd; x++)
		{
			pcvVertices[i].x = x *m_Size ;		//行－>	.	.	.	.	.   列
			pcvVertices[i].y=0;					//		.	.	.	.	.   |
			pcvVertices[i].z= -z * m_Size;		//		.	.	.	.	.	|
			pcvVertices[i].u=(float)n/ m_Row;	//		.	.	.	.	.	|
			pcvVertices[i].v=(float)m/m_Col;	//		.	.	.	.	.	|
			i++;// i++用来循环所有的顶点		//		.	.	.	.	.
			n++;// n＋＋用来控制当前行的所有元素，一个一个赋值							
		}
		m++;		//当第一行的点赋值完之后，m＋＋去给下一行的点赋值，
		n=0;		//此时的列的控制变量 n 要归0，从下一行的第一个元素开始赋值
	}
//＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
	//解锁
	m_pMesh->UnlockVertexBuffer();
	return S_OK;
}

HRESULT Mesh::InitIndex ()
{

	//设置索引缓冲的值
	WORD* pIndices;
	m_pMesh->LockIndexBuffer(0,(void**)&pIndices);

	WORD a = (WORD)m_Col + 1;// “a” 为：一行有多少个顶点,5
	WORD b = 0;
	WORD c = a + 1;

	WORD x, z;
	DWORD i=0;
	for(z = 0; z < m_Row; z++)
	{
		for(x = 0; x < m_Col; x++)
		{
			//pIndices[i]	= a;			//5		0----1
			//pIndices[i + 1]	= b;		//0		|\   |
			//pIndices[i + 2]	= c;		//6		| \  |
			//pIndices[i + 3]	= b + 1;	//1		|  \ |
			//pIndices[i + 4]	= c;		//6		|   \|
			//pIndices[i + 5]	= b;		//0		5----6

			pIndices[i]	= b;			//0		0----1
			pIndices[i + 1]	= b+1;		//1		|   /|
			pIndices[i + 2]	= a;		//5		|  / |
			pIndices[i + 3]	= c;		//6		| /  |
			pIndices[i + 4]	= a;		//5		|/   |
			pIndices[i + 5]	= b+1;		//1		5----6

			a++;
			b++;
			c++;
			i += 6;
		}

		a = c;
		b++;
		c=a+1;
	}


	//解锁
	m_pMesh->UnlockIndexBuffer();

	//清除对象


	return S_OK;
}

HRESULT Mesh::Render() 
{
	m_pd3dDevice->SetTexture (0,m_pDTex );
	//m_pd3dDevice->SetRenderState( D3DRS_FILLMODE,  D3DFILL_SOLID);

	//渲染地形
	m_pMesh->DrawSubset(0);

	return S_OK;
}

HRESULT Mesh::GetTerrainVertex(D3DXVECTOR3 *cross,DWORD index,float u,float v)
{
	WORD* pIndices;
	WORD index1,index2,index3;
	D3DXVECTOR3 v1,v2,v3;
	m_pMesh->LockIndexBuffer(0,(void**)&pIndices);

	index1=pIndices[index*3+0];
	index2=pIndices[index*3+1];
	index3=pIndices[index*3+2];
	m_pMesh->UnlockIndexBuffer();

	TERRAIN_CUSTOMVERTEX* pcvVertices;
	m_pMesh->LockVertexBuffer (0,(void**)&pcvVertices);

	v1.x=pcvVertices[index1].x;
	v1.y=pcvVertices[index1].y;
	v1.z=pcvVertices[index1].z;

	v2.x=pcvVertices[index2].x;
	v2.y=pcvVertices[index2].y;
	v2.z=pcvVertices[index2].z;

	v3.x=pcvVertices[index3].x;
	v3.y=pcvVertices[index3].y;
	v3.z=pcvVertices[index3].z;
	m_pMesh->UnlockVertexBuffer();

	*cross = v1 + u * (v2 - v1) + v * (v3 - v1);
	return S_OK;
}