light.cpp

是《3D游戏编程》的代码 买了这本书

//-----------------------------------------------------------------------------
// 名称: RenderSene.cpp
// 
// 功能: 进行3D场景的渲染——使用显示内存的顶点缓冲区。
//       
//-----------------------------------------------------------------------------

// 包含Direct3D头文件
#include <d3d8.h>
#include <d3dx8.h>

// Windows类的名称宏定义
#define  MY_WINCLASS_NAME      "Direct3D"

#define KEYDOWN(vk_code)  ((GetAsyncKeyState(vk_code) & 0x8000)? 1 : 0)
#define KEYUP(vk_code)    ((GetAsyncKeyState(vk_code) & 0x8000)? 0 : 1)

#define VK_1  0x31    // 按键 “1”的值0x31
#define VK_2  0x32

struct PLAYER
{
    D3DXVECTOR3    LookAt[3];
};

// 定义个表示顶点的结构
struct ELLIPSE_VERTEX
{
        D3DXVECTOR3 p;
        D3DXVECTOR3 n;
        FLOAT       tu, tv;
};

struct CUSTOMVERTEX01
{
    D3DXVECTOR3 position; 
    D3DXVECTOR3 normal;   
};

struct CUSTOMVERTEX02
{
    D3DXVECTOR3 position; 
    D3DCOLOR    color;  
    FLOAT       tu, tv;   
};

struct CUSTOMVERTEX
{
    FLOAT x, y, z; // x,y,z表示点的三维坐标值，
    DWORD color;        // 顶点颜色
};

// 自定义的顶点格式
#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE)
#define D3DFVF_CUSTOMVERTEX_ELLIPSE (D3DFVF_XYZ|D3DFVF_NORMAL|D3DFVF_TEX1)
#define D3DFVF_CUSTOMVERTEX01 (D3DFVF_XYZ|D3DFVF_NORMAL)
#define D3DFVF_CUSTOMVERTEX02 (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)

// 定义全局变量
LPDIRECT3D8             g_pMyD3D          = NULL; // 定义Direct3D对象的指针
LPDIRECT3DDEVICE8       g_pMyd3dDevice    = NULL; // 定义Direct3D设备指针
LPDIRECT3DVERTEXBUFFER8 g_pMyVxBufferRec     = NULL; // 定义顶点缓冲区对象指针
LPDIRECT3DVERTEXBUFFER8 g_pMyVxBufferLine     = NULL;
LPDIRECT3DVERTEXBUFFER8 g_pMyVxBufferEllipse    = NULL;
LPDIRECT3DVERTEXBUFFER8 g_pVB        = NULL;

// 定义用于墙面渲染的纹理指针变量
LPDIRECT3DTEXTURE8      g_pTextureWall   = NULL; 

// 定义用于地面渲染的纹理指针变量
LPDIRECT3DTEXTURE8      g_pTextureLand   = NULL; 

D3DXVECTOR3             g_lightPosition;

BOOL                    g_TextureFilter = TRUE;

PLAYER  g_Player;
float   g_Angle = 0;

#define LINE_VECTOR_NUM 20

// 定义包含4个顶点的顶点数组
/*CUSTOMVERTEX g_Vertices[] =
{
        { -1.5f, 0.0f, 0.0f, 0xffff0000, },  
        { -1.5f, 2.0f, 0.0f, 0xffff0000, },
		{  1.5f, 0.0f, 0.0f, 0xffff0000, },
		{  1.5f, 2.0f, 0.0f, 0xffff0000, },  

};*/

#define GRID_WIDTH       20.0f
#define NUM_GRID         20


#define ELLIPSE_RINGS     20
#define ELLIPSE_SEGMENTS  20

//-----------------------------------------------------------------------------
// 名称: InitD3D()
// 功能: 初始化3D环境的函数，函数中创建了Direct3D对象和Direct3D设备。
//       函数返回E_FAIL表示失败，返回E_OK表示成功。
//-----------------------------------------------------------------------------
HRESULT InitMy3D( HWND hWnd )
{
    // 创建Direct3D对象，是使用Direct3D的第一步操作
    if( NULL == ( g_pMyD3D = Direct3DCreate8( D3D_SDK_VERSION ) ) )
        return E_FAIL;

    // 获取当前Windows桌面的显示模式，保存到定义的d3ddm结构中
    D3DDISPLAYMODE d3ddm;
    if( FAILED( g_pMyD3D->GetAdapterDisplayMode( D3DADAPTER_DEFAULT, &d3ddm ) ) )
        return E_FAIL;

	// 定义Present结构   
    D3DPRESENT_PARAMETERS d3dpp; 

    // 把结构清零，创建设备时，结构中成员值为0表示使用缺省值 
    ZeroMemory( &d3dpp, sizeof(d3dpp) );

	// 指定创建的Direct3D是支持窗口的设备
    d3dpp.Windowed = TRUE;

	// 指定交换效果为D3DSWAPEFFECT_DISCARD，即把后台表面显示到前台表面以后，
	// 原来的后台表面包含的信息自动丢失
    d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;

	d3dpp.EnableAutoDepthStencil = TRUE;
    d3dpp.AutoDepthStencilFormat = D3DFMT_D16;

	// 后台缓冲区的的点格式与当前显示模式的点格式一致
    d3dpp.BackBufferFormat = d3ddm.Format;

	// 创建Direct3D设备:
	// 1. 使用主显卡创建设备，参数D3DADAPTER_DEFAULT
	// 2. 设备类型为硬件抽象设备，使用硬件加速功能，参数D3DDEVTYPE_HAL
    // 3. 使用前面创建的窗口用于目标表面的显示，参数hWnd
	// 4. 指定设备的对于顶点的处理能力为软件处理顶点，这是为了能够让所有
	//    的显卡支持,参数D3DCREATE_SOFTWARE_VERTEXPROCESSING
    if( FAILED( g_pMyD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd,
                                      D3DCREATE_SOFTWARE_VERTEXPROCESSING,
                                      &d3dpp, &g_pMyd3dDevice ) ) )
    {
        return E_FAIL;
    }

    g_pMyd3dDevice->SetRenderState( D3DRS_CULLMODE, D3DCULL_NONE );

    g_pMyd3dDevice->SetRenderState( D3DRS_LIGHTING, FALSE );
    g_pMyd3dDevice->SetRenderState( D3DRS_ZENABLE, TRUE );


	// 创建地面使用的纹理
    if( FAILED( D3DXCreateTextureFromFile( g_pMyd3dDevice, "land128.jpg",
                                           &g_pTextureLand ) ) )
        return E_FAIL;



	// 创建顶点缓冲区
    if( FAILED( g_pMyd3dDevice->CreateVertexBuffer( 4*sizeof(CUSTOMVERTEX02),
                                                  0, D3DFVF_CUSTOMVERTEX02,
                                                  D3DPOOL_DEFAULT, &g_pMyVxBufferLine ) ) )
    {
        return E_FAIL;
    } 

	// 获得顶点缓冲区的内存指针，并锁定顶点缓冲区
	CUSTOMVERTEX02 *pVertices1;
    if( FAILED( g_pMyVxBufferLine->Lock( 0, 4*sizeof(CUSTOMVERTEX02), (BYTE**)&pVertices1, 0 ) ) )
	{
        return E_FAIL;
	}

	// 初始化顶点数据到顶点缓冲区中
    pVertices1->position = D3DXVECTOR3(-12.0f, 0.0f, -12.0f);
	pVertices1->color =  0xffffffff;
	pVertices1->tu = 0.0f;
	pVertices1->tv = 24.0f;
	pVertices1++;
    pVertices1->position = D3DXVECTOR3(-12.0f, 0.0f, 10.0f);
	pVertices1->color =  0xffffffff;
	pVertices1->tu = 0.0f;
	pVertices1->tv = 0.0f;

	pVertices1++;
	pVertices1->position = D3DXVECTOR3( 10.0f, 0.0f, -12.0f);
	pVertices1->color =  0xffffffff;
	pVertices1->tu = 24.0f;
	pVertices1->tv = 24.0f;

	pVertices1++;
	pVertices1->position = D3DXVECTOR3( 10.0f, 0.0f, 10.0f);
	pVertices1->color =  0xffffffff;
	pVertices1->tu = 24.0f;
	pVertices1->tv = 0.0f;

	// 顶点缓冲区的解锁操作
    g_pMyVxBufferLine->Unlock();


	g_Player.LookAt[0] = D3DXVECTOR3( 0.0f, 0.8f,-4.0f );
	g_Player.LookAt[1] = D3DXVECTOR3( 0.0f, 0.0f,-3.0f );
	g_Player.LookAt[2] = D3DXVECTOR3( 0.0f, 1.0f, 0.0f );
    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/3.0, 1.0f, 0.2f, 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;
 
	//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，背景颜色为蓝色RGB(0,0,255)
    g_pMyd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, 
						D3DCOLOR_XRGB(0,100,255), 1.0f, 0 );
    
    // 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
	//**************************************************************
	if(g_TextureFilter == TRUE)
		g_pMyd3dDevice->SetTextureStageState(0, D3DTSS_MIPFILTER, D3DTEXF_POINT);
	else
		g_pMyd3dDevice->SetTextureStageState(0, D3DTSS_MIPFILTER, D3DTEXF_NONE);

	g_pMyd3dDevice->SetTexture( 0, g_pTextureLand );

	// 设置待渲染顶点的来源
    g_pMyd3dDevice->SetStreamSource( 0, g_pMyVxBufferLine, 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 );

	g_pMyd3dDevice->DrawPrimitive( D3DPT_TRIANGLESTRIP, 0, 2 );

	// 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——纹理", 
                              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 );
			}
			else
			{
				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;
}