DirextX编程

开发平台：
Visual C++

object.cpp：源码内容
							#include "dxstdafx.h"
#include <vector>
#include "object.h"
CSpotLight::CSpotLight()
{
	m_pMeshMtrl = NULL;
	m_pMesh = NULL;
	m_dwMtrls = 0;
	m_pTexture = NULL;
	m_bDeviceLost = true;
}
CSpotLight::~CSpotLight()
{
	delete [] m_pMeshMtrl;
	SAFE_RELEASE( m_pTexture );
	SAFE_RELEASE( m_pMesh );
}
void CSpotLight::OnDestroyDevice()
{
	SAFE_RELEASE( m_pTexture );
	SAFE_RELEASE( m_pMesh );
}
LRESULT CSpotLight::HandleMessages( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
	D3DXVECTOR3 lightEyePt = *( m_lightCamera.GetEyePt() );
	D3DXVECTOR3 lookAtPt   = *( m_lightCamera.GetLookAtPt() );
	m_light.Position.x = lightEyePt.x;  
	m_light.Position.y = lightEyePt.y;  
	m_light.Position.z = lightEyePt.z;
	m_light.Direction.x = lookAtPt.x - lightEyePt.x;
	m_light.Direction.y = lookAtPt.y - lightEyePt.y;
	m_light.Direction.z = -(lookAtPt.z - lightEyePt.z);
	return m_lightCamera.HandleMessages( hWnd, uMsg, wParam, lParam );
}
HRESULT CSpotLight::OnCreateDevice( LPDIRECT3DDEVICE9 pd3dDevice )
{
	HRESULT hr;
	m_pd3dDevice = pd3dDevice;
	// 载入X文件数据
	ID3DXBuffer* mtrlBuffer;
	hr = D3DXLoadMeshFromX( L"spotlight.x", D3DXMESH_MANAGED, m_pd3dDevice, NULL, &mtrlBuffer, NULL, &m_dwMtrls, &m_pMesh );
	if( FAILED(hr) )
	{
		MessageBox( NULL, L"spotlight.x文件不在当前目录下", L"Init spotlight failed", MB_OK );
		return hr;
	}
	// 提取模型材质
	D3DXMATERIAL* pMtrlInBuf = (D3DXMATERIAL*)mtrlBuffer->GetBufferPointer();
	m_pMeshMtrl = new D3DMATERIAL9[m_dwMtrls];
	for(DWORD i=0;i<m_dwMtrls;i++)
	{
		m_pMeshMtrl[i] = pMtrlInBuf[i].MatD3D;
		//在此修改mesh's material的部分属性
		m_pMeshMtrl[i].Emissive.r = m_pMeshMtrl[i].Emissive.g = m_pMeshMtrl[i].Emissive.b = 0.0f;
		m_pMeshMtrl[i].Ambient.r  = m_pMeshMtrl[i].Ambient.g  = m_pMeshMtrl[i].Ambient.b  = 1.0f;
	}
	mtrlBuffer->Release();
	// 创建纹理
	hr = D3DXCreateTextureFromFile( m_pd3dDevice, L"spotlight.bmp", &m_pTexture );
	if( FAILED(hr) )
	{
		MessageBox( NULL, L"spotlight.bmp不在当前目录下", L"Init spotlight failed", MB_OK );
		return hr;
	}
	
	return hr;
}
void CSpotLight::InitLight( D3DVECTOR position, D3DVECTOR direction, D3DVECTOR upVec )
{
	// 初始化光源
	ZeroMemory( &m_light, sizeof(D3DLIGHT9) );
	m_light.Type      = D3DLIGHT_SPOT;
	m_light.Position  = position;
	m_light.Direction = direction;
	m_light.Diffuse   = D3DXCOLOR( 1.0f, 1.0f, 1.0f, 1.0f );
	m_light.Phi       = D3DX_PI/3; //45度角
	m_light.Theta     = D3DX_PI/6;//18度角
	m_light.Falloff   = 1.0f;      //亮度从中心向边缘均匀扩散
	m_light.Attenuation0 = 0.5f;
	m_light.Attenuation1 = 0.5f;
	m_light.Range = 20.0f;
	// 初始化相机
	D3DXVECTOR3 pos( position );
	D3DXVECTOR3 lookAt( position.x + direction.x, position.y + direction.y, position.z + direction.z );
	D3DXVECTOR3 upVector( upVec );
	m_lightCamera.SetViewParams( &pos, &lookAt, &upVector );
	m_lightCamera.SetProjParams( D3DX_PI/4, 1.0f, 0.1f, 100.0f );
	m_lightCamera.SetScalers( 0.01f, 8.0f );
	m_lightCamera.SetRotateButtons( true, false, false );
}
void CSpotLight::FrameMove( float fElapsedTime )
{
	m_lightCamera.FrameMove( fElapsedTime );
}
void CSpotLight::PreRender()
{
	// lightViewMat指向lightCamera的当前视口矩阵
	D3DXMATRIX lightViewMat = *( m_lightCamera.GetViewMatrix() );
	D3DXMATRIX  MatViewInv;
	D3DXMatrixInverse( &MatViewInv, NULL, &lightViewMat );
	m_pd3dDevice->SetTransform( D3DTS_WORLD, &MatViewInv );
	m_pd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_CW );
}
void CSpotLight::OnRender()
{
	PreRender();
	for(DWORD i=0;i<m_dwMtrls;i++)
	{
		m_pd3dDevice->SetMaterial( &m_pMeshMtrl[i] );
		m_pd3dDevice->SetTexture( 0, m_pTexture );
		m_pMesh->DrawSubset(i);
	}
	PostRender();
}
void CSpotLight::PostRender()
{
}

						