fog.cpp

是《3D游戏编程》的代码 买了这本书

    g_lightPosition = D3DXVECTOR3( 0.0f, 1.0f,-4.0f );

	return S_OK;
}

//-----------------------------------------------------------------------------
// 名称: MatricesTrans()
// 功能: 处理转换操作
//-----------------------------------------------------------------------------
VOID MatricesTrans()
{
	// 进行观察坐标系转换
	D3DXMATRIX matView;

    D3DXMatrixLookAtLH( &matView, &(g_Player.LookAt[0]),
                                  &(g_Player.LookAt[1]),
                                  &(g_Player.LookAt[2]) );

    g_pMyd3dDevice->SetTransform( D3DTS_VIEW, &matView );

    // 进行透视转换
    D3DXMATRIX matProj;
    D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/2.5, 1.0f, 1.0f, 100.0f );
    g_pMyd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj );

}

//-----------------------------------------------------------------------------
// 名称: ProcInput()
// 功能: 处理外部控制设备的输入
//-----------------------------------------------------------------------------
VOID ProcInput()
{
	if(KEYDOWN(VK_DOWN))
	{
	    g_Player.LookAt[0].x = g_Player.LookAt[0].x-sinf(g_Angle)/20;
        g_Player.LookAt[0].z = g_Player.LookAt[0].z-cosf(g_Angle)/20;

		g_Player.LookAt[1].x = g_Player.LookAt[1].x-sinf(g_Angle)/20;
        g_Player.LookAt[1].z = g_Player.LookAt[1].z-cosf(g_Angle)/20;

		g_lightPosition.x = g_lightPosition.x - sinf(g_Angle)/20;
		g_lightPosition.z = g_lightPosition.z-cosf(g_Angle)/20;
	}

	if(KEYDOWN(VK_UP))
	{
	    g_Player.LookAt[0].x = g_Player.LookAt[0].x+sinf(g_Angle)/20;
        g_Player.LookAt[0].z = g_Player.LookAt[0].z+cosf(g_Angle)/20;

		g_Player.LookAt[1].x = g_Player.LookAt[1].x+sinf(g_Angle)/20;
        g_Player.LookAt[1].z = g_Player.LookAt[1].z+cosf(g_Angle)/20;

	    g_lightPosition.x = g_lightPosition.x+sinf(g_Angle)/20;
        g_lightPosition.z = g_lightPosition.z+cosf(g_Angle)/20;

	}

	if(KEYDOWN(VK_RIGHT))
	{
		g_Angle+=0.01f;
        g_Player.LookAt[1].x = g_Player.LookAt[0].x+sinf(g_Angle);
        g_Player.LookAt[1].z = g_Player.LookAt[0].z+cosf(g_Angle);
	}

	if(KEYDOWN(VK_LEFT))
	{
		g_Angle-=0.01f;
        g_Player.LookAt[1].x = g_Player.LookAt[0].x+sinf(g_Angle);
        g_Player.LookAt[1].z = g_Player.LookAt[0].z+cosf(g_Angle);
	}

	if(KEYDOWN(VK_1))
	{
		g_TextureFilter = TRUE;  // 按键1表示使用纹理过滤
	}
	else if(KEYDOWN(VK_2))
	{
		g_TextureFilter = FALSE;  // 按键2表示不使用纹理过滤
	}

	return;
}

//-----------------------------------------------------------------------------
// 名称: RenderSene()
// 功能: 渲染3D场景
//-----------------------------------------------------------------------------
VOID RenderSene()
{
	D3DXMATRIX matWorld;
	D3DXMATRIX matWorldRo;
    DWORD   dwFogColor = 0x00f5f5f5;

	//检查Direct3D设备是否已经创建，如果没有创建就直接返回
    if( NULL == g_pMyd3dDevice )
        return;
	D3DCOLORVALUE       color;
	color.r = 1.0f;
	color.b = 1.0f;
	color.g = 1.0f;

    // 清除Direct3D设备的后台表面，背景颜色为0x00b5b5b5
    g_pMyd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, 
						dwFogColor, 1.0f, 0 );
    
	// 设置雾效果
    g_pMyd3dDevice->SetRenderState( D3DRS_FOGENABLE, TRUE );
    g_pMyd3dDevice->SetRenderState( D3DRS_FOGCOLOR,  dwFogColor );

    g_pMyd3dDevice->SetRenderState( D3DRS_FOGSTART,   FtoDW(2.0f) );
    g_pMyd3dDevice->SetRenderState( D3DRS_FOGEND,     FtoDW(25.0f) );
         
	g_pMyd3dDevice->SetRenderState( D3DRS_FOGVERTEXMODE,  D3DFOG_LINEAR );
    g_pMyd3dDevice->SetRenderState( D3DRS_RANGEFOGENABLE, TRUE );


    // 打开3D渲染开关
    g_pMyd3dDevice->BeginScene();

	D3DXMatrixIdentity(&matWorld);
	g_pMyd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );

	D3DMATERIAL8 mtrl;
    ZeroMemory( &mtrl, sizeof(D3DMATERIAL8) );
    mtrl.Diffuse.r = mtrl.Ambient.r = 1.0f;
    mtrl.Diffuse.g = mtrl.Ambient.g = 1.0f;
    mtrl.Diffuse.b = mtrl.Ambient.b = 0.0f;
    mtrl.Diffuse.a = mtrl.Ambient.a = 1.0f;
    g_pMyd3dDevice->SetMaterial( &mtrl );

	//**************************************************************
	// 渲染地面
	//**************************************************************
    g_pMyd3dDevice->SetTexture( 0, g_pTextureLand );

    g_pMyd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG1, D3DTA_TEXTURE );
    g_pMyd3dDevice->SetTextureStageState( 0, D3DTSS_COLORARG2, D3DTA_DIFFUSE );
    g_pMyd3dDevice->SetTextureStageState( 0, D3DTSS_COLOROP,   D3DTOP_MODULATE );
    g_pMyd3dDevice->SetTextureStageState( 0, D3DTSS_MINFILTER, D3DTEXF_LINEAR );
    g_pMyd3dDevice->SetTextureStageState( 0, D3DTSS_MAGFILTER, D3DTEXF_LINEAR );
			
	D3DXMatrixTranslation( &matWorld, -40, 0, -40 );
	g_pMyd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );

    g_pMyd3dDevice->SetVertexShader( D3DFVF_FOGVERTEX );
    g_pMyd3dDevice->SetStreamSource( 0, g_pTerrainVB, sizeof(FOGVERTEX) );
    g_pMyd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP,
                                   0, g_dwNumTerrainVertices-2 );

	//**************************************************************
	// 渲染墙面
	//**************************************************************
	// 设置待渲染顶点的来源

    g_pMyd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE,   TRUE );
    g_pMyd3dDevice->SetRenderState( D3DRS_SRCBLEND,  D3DBLEND_SRCALPHA);
    g_pMyd3dDevice->SetRenderState( D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);

	g_pMyd3dDevice->SetRenderState( D3DRS_ALPHATESTENABLE, TRUE );
    g_pMyd3dDevice->SetRenderState( D3DRS_ALPHAREF,        0x0f );
    g_pMyd3dDevice->SetRenderState( D3DRS_ALPHAFUNC,D3DCMP_GREATEREQUAL );

    g_pMyd3dDevice->SetTexture( 0, g_pTextureWall );

	if(g_TextureFilter == TRUE)
	{
		g_pMyd3dDevice->SetTextureStageState(0, D3DTSS_MAGFILTER, 
										D3DTEXF_LINEAR );
	}
	else
	{
		g_pMyd3dDevice->SetTextureStageState(0, D3DTSS_MAGFILTER, 
										D3DTEXF_NONE );
	}

    g_pMyd3dDevice->SetStreamSource( 0, g_pMyVxBufferRec, sizeof(CUSTOMVERTEX02) );

    // 进行3D渲染，在这里设置渲染的顶点格式，并调用DrawPrimitive完成顶点渲染处理
    g_pMyd3dDevice->SetVertexShader( D3DFVF_CUSTOMVERTEX02 );

	float i, j;
	for (i = -GRID_WIDTH/2 + 1; i < GRID_WIDTH/2; i+=4)
	{
		for(j = -GRID_WIDTH/2 + 1; j < GRID_WIDTH/2; j+=4)
		{

			// 为不同的墙面设置不同的材质
			float r = 1 - 1.0f/i;
			float g = 1 - 1.0f/j;
			float a = 1 - 1.0f/(i+j);

			mtrl.Diffuse.r = mtrl.Ambient.r = r;
			mtrl.Diffuse.g = mtrl.Ambient.g = g;
			mtrl.Diffuse.b = mtrl.Ambient.b = 0.0f;
			mtrl.Diffuse.a = mtrl.Ambient.a = a;

			mtrl.Specular.r = mtrl.Specular.g =mtrl.Specular.b = 1.0f;
			mtrl.Specular.a = 1.0f;
			mtrl.Power = 50.0f;

			g_pMyd3dDevice->SetMaterial( &mtrl );

			D3DXMatrixTranslation( &matWorld, j, 0, i );
			g_pMyd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );
			g_pMyd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 2 );
		}
	}
    g_pMyd3dDevice->SetTexture( 0, NULL );

	g_pMyd3dDevice->SetRenderState( D3DRS_ALPHATESTENABLE, FALSE );
    g_pMyd3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, FALSE );

	// 关闭3D渲染开关
    g_pMyd3dDevice->EndScene();
    // 展现后台表面到窗口的客户区域中，即把渲染后的图像显示到窗口中
    g_pMyd3dDevice->Present( NULL, NULL, NULL, NULL );
	
	return;
}


//-----------------------------------------------------------------------------
// 名称: Cleanup()
// 功能: 释放创建过的Direct3D对象和设备
//-----------------------------------------------------------------------------
VOID Cleanup()
{
    if( g_pTextureWall != NULL )
        g_pTextureWall->Release();

    if( g_pTextureLand != NULL )
        g_pTextureLand->Release();

	if(g_pMyVxBufferRec != NULL)
		g_pMyVxBufferRec->Release();

	if(g_pMyVxBufferLine != NULL)
		g_pMyVxBufferLine->Release();

	// 释放时的顺序为先释放后创建的对象，设备后创建，先释放
	if( g_pMyd3dDevice != NULL) 
        g_pMyd3dDevice->Release();

	// Direct3D对象最先创建，但需要最后释放
    if( g_pMyD3D != NULL)
        g_pMyD3D->Release();

	return;
}


//-----------------------------------------------------------------------------
// 名称: MsgProc()
// 功能: Windows的消息处理函数
//-----------------------------------------------------------------------------
LRESULT WINAPI MsgProc( HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    switch( msg )
    {
        case WM_DESTROY:
            PostQuitMessage( 0 );
            return 0;

    }

    return DefWindowProc( hWnd, msg, wParam, lParam );
}

//-----------------------------------------------------------------------------
// 名称: WinMain()
// 功能: Windows主函数，程序启动时，从这里开始执行
//-----------------------------------------------------------------------------
int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
    // 定义一个Windows类，指定消息的处理函数为MsgProc
    WNDCLASSEX wc = { sizeof(WNDCLASSEX), CS_CLASSDC, MsgProc, 0L, 0L, 
                      GetModuleHandle(NULL), NULL, NULL, NULL, NULL,
                      MY_WINCLASS_NAME, NULL };
	// 注册这个窗口类
    RegisterClassEx( &wc );

    // 创建应用程序窗口
    HWND hWnd = CreateWindow( MY_WINCLASS_NAME, "3D游戏编程——雾", 
                              WS_OVERLAPPEDWINDOW, 100, 100, 400, 300,
                              GetDesktopWindow(), NULL, wc.hInstance, NULL );

    // 调用InitMy3D函数进行3D对象和设备的创建，传入参数为窗口的句柄hWnd
    if( SUCCEEDED( InitMy3D( hWnd ) ) )
    { 
        // 显示窗口
        ShowWindow( hWnd, SW_SHOWDEFAULT );
        UpdateWindow( hWnd );

        // 程序主循环，进行窗口消息的分发，消息的处理在MsgProc函数中完成
        MSG msg; 
        while( msg.message != WM_QUIT)
        {
			if(PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ))
			{
				TranslateMessage( &msg );
				DispatchMessage( &msg );
			}
			
			ProcInput();
			MatricesTrans();
			RenderSene();
			
        }
    }

    // 调用Cleanup函数清除3D对象和设备
    Cleanup();

	// 注销窗口类
    UnregisterClass( MY_WINCLASS_NAME, wc.hInstance );
    return 0;
}