《精通DirectX 3D》第二十七章 自然现象模拟 01_MovingCloud

《精通DirectX 3D》第二十七章 自然现象模拟 01_MovingCloud

// =============================================================================
//  Desc: 主程序源代码
// =============================================================================
#include  " dxstdafx.h "
#include  " resource.h "


// -----------------------------------------------------------------------------
//  全局变量
// -----------------------------------------------------------------------------
ID3DXFont *                  g_pFont  =  NULL;           // ID3DXFont字体对象
ID3DXSprite *                g_pTextSprite  =  NULL;     // ID3DXSprite文本精灵对象
bool                        g_bShowHelp  =   true ;       // 标识是否显示简单说明文本

CDXUTDialogResourceManager g_DialogResourceManager;  // 对话框资源管理器
CD3DSettingsDlg            g_SettingsDlg;            // Direct3D设备设置对话框
CDXUTDialog                g_HUD;                    // 对话框
CDXUTDialog                g_SampleUI;               // 对话框

LPDIRECT3DVERTEXBUFFER9    g_pGroundVB;              // 地面顶点缓冲区
LPDIRECT3DVERTEXBUFFER9    g_pSkyVB;                 // 天空顶点缓冲区
LPDIRECT3DTEXTURE9         g_pGroundTex;             // 地面纹理
LPDIRECT3DTEXTURE9         g_pCloudTex;               // 云彩纹理
D3DXMATRIX                 g_matGround;              // 地面世界矩阵
D3DXMATRIX                 g_matSky;                 // 天空世界矩阵


// -----------------------------------------------------------------------------
//  Desc: 顶点结构
// -----------------------------------------------------------------------------
struct   GROUNDVERTEX
{
     float   x, y, z;     // 顶点位置
     float   u,v ;        // 顶点纹理坐标
};
#define  D3DFVF_GROUNDVERTEX   (D3DFVF_XYZ|D3DFVF_TEX1)

struct   SKYVERTEX
{
     float   x, y, z;     // 顶点位置
    DWORD  dwColor;     // 顶点颜色
     float   u,v ;        // 顶点纹理坐标     
};
#define  D3DFVF_SKYVERTEX   (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)



// -----------------------------------------------------------------------------
//  控件ID
// -----------------------------------------------------------------------------
#define  IDC_TOGGLEFULLSCREEN      1
#define  IDC_TOGGLEREF             2
#define  IDC_CHANGEDEVICE          3


// -----------------------------------------------------------------------------
//  Desc: 函数声明
// ------------------------------------------------------------------------------
bool     CALLBACK IsDeviceAcceptable( D3DCAPS9 *  pCaps, D3DFORMAT AdapterFormat, D3DFORMAT BackBufferFormat,  bool  bWindowed,  void *  pUserContext );
bool     CALLBACK ModifyDeviceSettings( DXUTDeviceSettings *  pDeviceSettings,  const  D3DCAPS9 *  pCaps,  void *  pUserContext );
HRESULT CALLBACK OnCreateDevice( IDirect3DDevice9 *  pd3dDevice,  const  D3DSURFACE_DESC *  pBackBufferSurfaceDesc,  void *  pUserContext );
HRESULT CALLBACK OnResetDevice( IDirect3DDevice9 *  pd3dDevice,  const  D3DSURFACE_DESC *  pBackBufferSurfaceDesc,  void *  pUserContext );
void     CALLBACK OnFrameMove( IDirect3DDevice9 *  pd3dDevice,  double  fTime,  float  fElapsedTime,  void *  pUserContext );
void     CALLBACK OnFrameRender( IDirect3DDevice9 *  pd3dDevice,  double  fTime,  float  fElapsedTime,  void *  pUserContext );
LRESULT CALLBACK MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam,  bool *  pbNoFurtherProcessing,  void *  pUserContext );
void     CALLBACK KeyboardProc( UINT nChar,  bool  bKeyDown,  bool  bAltDown,  void *  pUserContext );
void     CALLBACK OnGUIEvent( UINT nEvent,  int  nControlID, CDXUTControl *  pControl,  void *  pUserContext );
void     CALLBACK OnLostDevice(  void *  pUserContext );
void     CALLBACK OnDestroyDevice(  void *  pUserContext );

void     InitApp();
void     RenderText();


// -----------------------------------------------------------------------------
//  Desc: 入口函数
// -----------------------------------------------------------------------------
INT WINAPI WinMain( HINSTANCE, HINSTANCE, LPSTR,  int  )
{
     // 为Debug配置启用运行时内存检查功能
#if  defined(DEBUG) | defined(_DEBUG)
    _CrtSetDbgFlag( _CRTDBG_ALLOC_MEM_DF  |  _CRTDBG_LEAK_CHECK_DF );
#endif

     // 设置回调函数
    DXUTSetCallbackDeviceCreated( OnCreateDevice );
    DXUTSetCallbackDeviceReset( OnResetDevice );
    DXUTSetCallbackDeviceLost( OnLostDevice );
    DXUTSetCallbackDeviceDestroyed( OnDestroyDevice );
    DXUTSetCallbackMsgProc( MsgProc );
    DXUTSetCallbackKeyboard( KeyboardProc );
    DXUTSetCallbackFrameRender( OnFrameRender );
    DXUTSetCallbackFrameMove( OnFrameMove );

     // 应用程序相关的初始化
    InitApp();

     // 初始化DXUT, 创建窗口, 创建Direct3D设备对象
    DXUTInit(  true ,  true ,  true  );
    DXUTSetCursorSettings(  true ,  true  );
    DXUTCreateWindow( L " MoveingCloud "  );
    DXUTCreateDevice( D3DADAPTER_DEFAULT,  true ,  640 ,  480 , 
        IsDeviceAcceptable, ModifyDeviceSettings );

     // 进入消息循环和场景渲染
    DXUTMainLoop();

     // 在此进行应用程序相关的清除工作

     return  DXUTGetExitCode();
}


// -----------------------------------------------------------------------------
//  Desc: 应用程序相关初始化
// -----------------------------------------------------------------------------
void  InitApp()
{
     // 初始化对话框
    g_SettingsDlg.Init(  & g_DialogResourceManager );
    g_HUD.Init(  & g_DialogResourceManager );
    g_SampleUI.Init(  & g_DialogResourceManager );

     // 为g_HUD对话框设置消息处理函数,添加控件
    g_HUD.SetCallback( OnGUIEvent );  int  iY  =   10 ; 
    g_HUD.AddButton( IDC_TOGGLEFULLSCREEN, L " Toggle full screen " ,  35 , iY,  125 ,  22  );
    g_HUD.AddButton( IDC_TOGGLEREF, L " Toggle REF (F3) " ,  35 , iY  +=   24 ,  125 ,  22  );
    g_HUD.AddButton( IDC_CHANGEDEVICE, L " Change device (F2) " ,  35 , iY  +=   24 ,  125 ,  22 , VK_F2 );
}


// -----------------------------------------------------------------------------
//  Desc: 设备能力检查
// -----------------------------------------------------------------------------
bool  CALLBACK IsDeviceAcceptable( D3DCAPS9 *  pCaps, D3DFORMAT AdapterFormat, 
                                  D3DFORMAT BackBufferFormat,  bool  bWindowed, 
                                   void *  pUserContext )
{
     // 检查后台缓冲区格式是否支持Alpha混合等操作(post pixel blending operations)
    IDirect3D9 *  pD3D  =  DXUTGetD3DObject(); 
     if ( FAILED( pD3D -> CheckDeviceFormat( pCaps -> AdapterOrdinal, pCaps -> DeviceType,
                    AdapterFormat, D3DUSAGE_QUERY_POSTPIXELSHADER_BLENDING, 
                    D3DRTYPE_TEXTURE, BackBufferFormat ) ) )
         return   false ;

     return   true ;
}


// -----------------------------------------------------------------------------
//  Desc: 修改Direct3D渲染设备设置
// -----------------------------------------------------------------------------
bool  CALLBACK ModifyDeviceSettings( DXUTDeviceSettings *  pDeviceSettings, 
                                     const  D3DCAPS9 *  pCaps,  void *  pUserContext )
{
     // 如果不支持硬件顶点处理则使用软件顶点处理
     if ( (pCaps -> DevCaps  &  D3DDEVCAPS_HWTRANSFORMANDLIGHT)  ==   0 )
    {
        pDeviceSettings -> BehaviorFlags  =  D3DCREATE_SOFTWARE_VERTEXPROCESSING;
    }

     // 如果使用参考设备,则弹出警告对话框
     static   bool  s_bFirstTime  =   true ;
     if ( s_bFirstTime )
    {
        s_bFirstTime  =   false ;
         if ( pDeviceSettings -> DeviceType  ==  D3DDEVTYPE_REF )
            DXUTDisplaySwitchingToREFWarning();
    }

     return   true ;
}


// -----------------------------------------------------------------------------
//  Desc: 在此创建管理内存资源对象
// -----------------------------------------------------------------------------
HRESULT CALLBACK OnCreateDevice( IDirect3DDevice9 *  pd3dDevice, 
                                 const  D3DSURFACE_DESC *  pBackBufferSurfaceDesc, 
                                 void *  pUserContext )
{
    HRESULT hr;

    V_RETURN( g_DialogResourceManager.OnCreateDevice( pd3dDevice ) );
    V_RETURN( g_SettingsDlg.OnCreateDevice( pd3dDevice ) );
    
     // 创建字体
    V_RETURN( D3DXCreateFont( pd3dDevice,  15 ,  0 , FW_BOLD,  1 , FALSE, DEFAULT_CHARSET, 
                         OUT_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH  |  FF_DONTCARE, 
                         L " Arial " ,  & g_pFont ) );

     // 创建地面顶点缓冲区
    V_RETURN( pd3dDevice -> CreateVertexBuffer(  4 * sizeof (GROUNDVERTEX),
                                               0 , D3DFVF_GROUNDVERTEX,
                                              D3DPOOL_MANAGED,  & g_pGroundVB, NULL ));

    GROUNDVERTEX vertices1[]  =
    {
        {  - 32.0f ,   0.0f ,  - 32.0f ,   0.0f ,   16.0f , },
        {  - 32.0f ,   0.0f ,   32.0f ,   0.0f ,    0.0f , },
        {   32.0f ,   0.0f ,  - 32.0f ,  16.0f ,   16.0f , }, 
        {   32.0f ,   0.0f ,   32.0f ,  16.0f ,    0.0f , }
    };

    VOID *  pVertices1;
     if ( FAILED( g_pGroundVB -> Lock(  0 ,  sizeof (vertices1), ( void ** ) & pVertices1,  0  ) ) )
         return  E_FAIL;
    memcpy( pVertices1, vertices1,  sizeof (vertices1) );
    g_pGroundVB -> Unlock();

     // 创建天空顶点缓冲区
   V_RETURN( pd3dDevice -> CreateVertexBuffer(  4 * sizeof (SKYVERTEX),
                                              0 , D3DFVF_SKYVERTEX,
                                             D3DPOOL_MANAGED,  & g_pSkyVB, NULL ));
    SKYVERTEX vertices2[]  =
    {
        {  - 25.0f ,  0.0f ,   0.0f ,   0x003030b0 ,  0.0f ,  1.0f , },
        {  - 25.0f ,  20.0f ,  0.0f ,   0x003030b0 ,  0.0f ,  0.5f , }, 
        {   25.0f ,  0.0f ,   0.0f ,   0x003030b0 ,  1.0f ,  1.0f , }, 
        {   25.0f ,  20.0f ,  0.0f ,   0x003030b0 ,  1.0f ,  0.5f , }
    };

    VOID *  pVertices2;
     if ( FAILED( g_pSkyVB -> Lock(  0 ,  sizeof (vertices2), ( void ** ) & pVertices2,  0  ) ) )
         return  E_FAIL;
    memcpy( pVertices2, vertices2,  sizeof (vertices2) );
    g_pSkyVB -> Unlock();

     // 创建地面纹理和云彩纹理
    V_RETURN( D3DXCreateTextureFromFile( pd3dDevice, L " ground.jpg " ,  & g_pGroundTex ));
    V_RETURN( D3DXCreateTextureFromFile( pd3dDevice, L " cloud.bmp " ,  & g_pCloudTex ));

     return  S_OK;
}


// -----------------------------------------------------------------------------
//  Desc: 在此创建默认内存类型资源对象
// -----------------------------------------------------------------------------
HRESULT CALLBACK OnResetDevice( IDirect3DDevice9 *  pd3dDevice, 
                                 const  D3DSURFACE_DESC *  pBackBufferSurfaceDesc, 
                                 void *  pUserContext )
{
    HRESULT hr;

    V_RETURN( g_DialogResourceManager.OnResetDevice() );
    V_RETURN( g_SettingsDlg.OnResetDevice() );

     // 设置对话框位置和尺寸
    g_HUD.SetLocation( pBackBufferSurfaceDesc -> Width - 170 ,  0  );
    g_HUD.SetSize(  170 ,  170  );
    g_SampleUI.SetLocation( pBackBufferSurfaceDesc -> Width - 170 , 
                            pBackBufferSurfaceDesc -> Height - 350  );
    g_SampleUI.SetSize(  170 ,  300  );

     // 恢复字体
     if ( g_pFont )
        V_RETURN( g_pFont -> OnResetDevice() );
   
     // 创建ID3DXSprite接口对象
    V_RETURN( D3DXCreateSprite( pd3dDevice,  & g_pTextSprite ) );

     // 初始化地面世界矩阵
    D3DXMatrixIdentity( & g_matGround);

     // 构造天空世界矩阵
    D3DXMatrixIdentity( & g_matSky);
    D3DXMatrixRotationX(  & g_matSky,  - D3DX_PI / 3.0f  );
    D3DXMATRIX tempMatrix;
    D3DXMatrixTranslation(  & tempMatrix,  0 ,  0 ,  32  );
    D3DXMatrixMultiply(  & g_matSky,  & g_matSky,  & tempMatrix );

     // 设置观察矩阵
    D3DXMATRIXA16 matView;
    D3DXVECTOR3 vEyePt(  0 ,  1.0f ,  - 5.0f  );
    D3DXVECTOR3 vLookatPt(  0.0f ,  0.0f ,  10.0f  );
    D3DXVECTOR3 vUpVec(  0.0f ,  1.0f ,  0.0f  );
    D3DXMatrixLookAtLH(  & matView,  & vEyePt,  & vLookatPt,  & vUpVec );
    pd3dDevice -> SetTransform( D3DTS_VIEW,  & matView );

     // 设置投影矩阵
    D3DXMATRIXA16 matProj;
     float  fAspectRatio  =  ( float )pBackBufferSurfaceDesc -> Width  /  pBackBufferSurfaceDesc -> Height;
    D3DXMatrixPerspectiveFovLH(  & matProj, D3DX_PI / 4 , fAspectRatio,  1.0f ,  100.0f  );
    pd3dDevice -> SetTransform( D3DTS_PROJECTION,  & matProj );

     // 设置纹理渲染状态
    pd3dDevice -> SetTextureStageState(  0 , D3DTSS_COLORARG1, D3DTA_TEXTURE );
    pd3dDevice -> SetTextureStageState(  0 , D3DTSS_COLORARG2, D3DTA_DIFFUSE );
    pd3dDevice -> SetSamplerState(  0 , D3DSAMP_MINFILTER, D3DTEXF_LINEAR );
    pd3dDevice -> SetSamplerState(  0 , D3DSAMP_MAGFILTER, D3DTEXF_LINEAR );
    
     // 禁用照明效果
    pd3dDevice -> SetRenderState( D3DRS_LIGHTING,  false  );

     return  S_OK;
}


// -----------------------------------------------------------------------------
//  Desc: 更新场景
// -----------------------------------------------------------------------------
void  CALLBACK OnFrameMove( IDirect3DDevice9 *  pd3dDevice,  double  fTime, 
                            float  fElapsedTime,  void *  pUserContext )
{
     // 移动天空纹理坐标
    SKYVERTEX *   pVertices;
    g_pSkyVB -> Lock( 0 ,  0 , ( void ** ) & pVertices,  0 );
     for ( int  i = 0 ; i < 4 ; i ++ )
    {
        pVertices[i].v  -=   0.2f * fElapsedTime;
    }
    g_pSkyVB -> Unlock();
}


// -----------------------------------------------------------------------------
//  Desc: 渲染场景
// -----------------------------------------------------------------------------
void  CALLBACK OnFrameRender( IDirect3DDevice9 *  pd3dDevice,  double  fTime, 
                             float  fElapsedTime,  void *  pUserContext )
{
    HRESULT hr;
  
     // 如果正在利用Direct3D设备设置对话框进行设置, 则不渲染场景
     if ( g_SettingsDlg.IsActive() )
    {
        g_SettingsDlg.OnRender( fElapsedTime );
         return ;
    }

     // 清除后台颜色缓冲区和深度缓冲区
    V( pd3dDevice -> Clear( 0 , NULL, D3DCLEAR_TARGET  |  D3DCLEAR_ZBUFFER, 
                         D3DCOLOR_ARGB( 0 ,  45 ,  50 ,  170 ),  1.0f ,  0 ) );

     // 渲染场景
     if ( SUCCEEDED( pd3dDevice -> BeginScene() ) )
    {
         // 渲染地面
        pd3dDevice -> SetTextureStageState(  0 , D3DTSS_COLOROP,   D3DTOP_SELECTARG1);
        pd3dDevice -> SetTransform( D3DTS_WORLD,  & g_matGround );
        pd3dDevice -> SetTexture(  0 , g_pGroundTex );
        pd3dDevice -> SetStreamSource(  0 , g_pGroundVB,  0 ,  sizeof (GROUNDVERTEX) );
        pd3dDevice -> SetFVF( D3DFVF_GROUNDVERTEX );
        pd3dDevice -> DrawPrimitive( D3DPT_TRIANGLESTRIP,  0 ,  2  );

         // 渲染天空
        pd3dDevice -> SetTextureStageState(  0 , D3DTSS_COLOROP,   D3DTOP_ADD);
        pd3dDevice -> SetTransform( D3DTS_WORLD,  & g_matSky );
        pd3dDevice -> SetTexture(  0 , g_pCloudTex );
        pd3dDevice -> SetStreamSource(  0 , g_pSkyVB,  0 ,  sizeof (SKYVERTEX) );
        pd3dDevice -> SetFVF( D3DFVF_SKYVERTEX );
        pd3dDevice -> DrawPrimitive( D3DPT_TRIANGLESTRIP,  0 ,  2  );

         // 渲染文本和控件
        DXUT_BeginPerfEvent( DXUT_PERFEVENTCOLOR, L " HUD / Stats "  ); 
        RenderText();
        V( g_HUD.OnRender( fElapsedTime ) );
        V( g_SampleUI.OnRender( fElapsedTime ) );
        DXUT_EndPerfEvent();

        V( pd3dDevice -> EndScene() );
    }
}


// -----------------------------------------------------------------------------
//  Desc: 渲染文本
// -----------------------------------------------------------------------------
void  RenderText()
{
    CDXUTTextHelper txtHelper( g_pFont, g_pTextSprite,  15  );

     // 显示当前Direct3D设备状态和渲染帧速率
    txtHelper.Begin();
    txtHelper.SetInsertionPos(  5 ,  5  );
    txtHelper.SetForegroundColor( D3DXCOLOR(  1.0f ,  1.0f ,  0.0f ,  1.0f  ) );
    txtHelper.DrawTextLine( DXUTGetFrameStats( true ) );
    txtHelper.DrawTextLine( DXUTGetDeviceStats() );

     // 显示其他简要信息
    txtHelper.SetForegroundColor( D3DXCOLOR(  1.0f ,  1.0f ,  1.0f ,  1.0f  ) );
    txtHelper.DrawTextLine( L " 动态云彩效果 "  );
    
     // 显示简单帮助文本
     const  D3DSURFACE_DESC *  pd3dsdBackBuffer  =  DXUTGetBackBufferSurfaceDesc();
     if ( g_bShowHelp )
    {
        txtHelper.SetInsertionPos(  10 , pd3dsdBackBuffer -> Height - 15 * 6  );
        txtHelper.SetForegroundColor( D3DXCOLOR(  1.0f ,  0.75f ,  0.0f ,  1.0f  ) );
        txtHelper.DrawTextLine( L " Controls (F1 to hide): "  );

        txtHelper.SetInsertionPos(  40 , pd3dsdBackBuffer -> Height - 15 * 5  );
        txtHelper.DrawTextLine( L " Quit: ESC "  );
    }
     else
    {
        txtHelper.SetInsertionPos(  10 , pd3dsdBackBuffer -> Height - 15 * 2  );
        txtHelper.SetForegroundColor( D3DXCOLOR(  1.0f ,  1.0f ,  1.0f ,  1.0f  ) );
        txtHelper.DrawTextLine( L " Press F1 for help "  );
    }
    txtHelper.End();
}


// -----------------------------------------------------------------------------
//  Desc: 消息处理
// -----------------------------------------------------------------------------
LRESULT CALLBACK MsgProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, 
                          bool *  pbNoFurtherProcessing,  void *  pUserContext )
{
     * pbNoFurtherProcessing  =  g_DialogResourceManager.MsgProc( hWnd, uMsg, wParam, lParam );
     if (  * pbNoFurtherProcessing )
         return   0 ;

     if ( g_SettingsDlg.IsActive() )
    {
        g_SettingsDlg.MsgProc( hWnd, uMsg, wParam, lParam );
         return   0 ;
    }

     * pbNoFurtherProcessing  =  g_HUD.MsgProc( hWnd, uMsg, wParam, lParam );
     if (  * pbNoFurtherProcessing )
         return   0 ;
   
     * pbNoFurtherProcessing  =  g_SampleUI.MsgProc( hWnd, uMsg, wParam, lParam );
     if (  * pbNoFurtherProcessing )
         return   0 ;

     return   0 ;
}


// -----------------------------------------------------------------------------
//  Desc: 键盘消息处理
// -----------------------------------------------------------------------------
void  CALLBACK KeyboardProc( UINT nChar,  bool  bKeyDown,  bool  bAltDown,  void *  pUserContext )
{
     if ( bKeyDown )
    {
         switch ( nChar )
        {
             case  VK_F1: g_bShowHelp  =   ! g_bShowHelp;  break ;
        }
    }
}


// -----------------------------------------------------------------------------
//  Desc: 处理各种控件消息
// -----------------------------------------------------------------------------
void  CALLBACK OnGUIEvent( UINT nEvent,  int  nControlID, CDXUTControl *  pControl, 
                          void *  pUserContext )
{
     switch ( nControlID )
    {
         case  IDC_TOGGLEFULLSCREEN:
            DXUTToggleFullScreen(); 
             break ;

         case  IDC_TOGGLEREF:
            DXUTToggleREF(); 
             break ;

         case  IDC_CHANGEDEVICE:
            g_SettingsDlg.SetActive(  ! g_SettingsDlg.IsActive() ); 
             break ;
    }
}


// -----------------------------------------------------------------------------
//  Desc: 释放在OnResetDevice()中创建的资源
// -----------------------------------------------------------------------------
void  CALLBACK OnLostDevice(  void *  pUserContext )
{
    g_DialogResourceManager.OnLostDevice();
    g_SettingsDlg.OnLostDevice();
     if ( g_pFont )
        g_pFont -> OnLostDevice();
    SAFE_RELEASE( g_pTextSprite );
}


// ------------------------------------------------------------------------------
//  Desc: 释放在OnCreateDevice()中创建的资源
// ------------------------------------------------------------------------------
void  CALLBACK OnDestroyDevice(  void *  pUserContext )
{
    g_DialogResourceManager.OnDestroyDevice();
    g_SettingsDlg.OnDestroyDevice();
    SAFE_RELEASE( g_pFont );

    SAFE_RELEASE(g_pGroundVB);
    SAFE_RELEASE(g_pSkyVB);
    SAFE_RELEASE(g_pGroundTex);
    SAFE_RELEASE(g_pCloudTex);
}