小烏龜

   DirectX中，如何獲取深度值，然后將它存儲(chǔ)在一個(gè)txt文件中？其實(shí)只要修改兩個(gè)地方：
   第一個(gè)地方是：創(chuàng)建Direct3D設(shè)備時(shí)，將D3DPRESENT_PARAMETERS類型表示變量的AutoDepthStencilFormat設(shè)置為D3DFMT_D32F_LOCKABLE，代碼如下：   

 
    D3DPRESENT_PARAMETERS d3dpp;
    d3dpp.BackBufferWidth            = width;
    d3dpp.BackBufferHeight           = height;
    d3dpp.BackBufferFormat           = D3DFMT_A8R8G8B8;
    d3dpp.BackBufferCount            = 1;
    d3dpp.MultiSampleType            = D3DMULTISAMPLE_NONE;
    d3dpp.MultiSampleQuality         = 0;
    d3dpp.SwapEffect                   = D3DSWAPEFFECT_DISCARD; 
    d3dpp.hDeviceWindow              = hwnd;
    d3dpp.Windowed                     = windowed;
    d3dpp.EnableAutoDepthStencil     = true; 
    d3dpp.AutoDepthStencilFormat     = D3DFMT_D32F_LOCKABLE;    // 16位總不行
    d3dpp.Flags                      = 0;
    d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
    d3dpp.PresentationInterval       = D3DPRESENT_INTERVAL_IMMEDIATE;

   第二個(gè)地方是：設(shè)置鎖定緩存表面，并進(jìn)行讀寫的代碼：

// 獲取深度模板表面
            HRESULT hr = Device->GetDepthStencilSurface( &pZBuffer );
            if ( FAILED( hr ) ) { 
                MessageBox( NULL, "GetDepthStencilSurface failure", 0, 0 ); 
            }
            
            // 打開文件
            pFile = fopen( "ZBuffer.txt", "w" );
            if ( pFile == NULL ) { 
                MessageBox( NULL, "shit", NULL, NULL); 
            }
            
            // 獲取表面特性
            D3DSURFACE_DESC surfaceDesc;
            pZBuffer->GetDesc( &surfaceDesc );

            // 鎖定表面
            D3DLOCKED_RECT lockRect;
            hr = pZBuffer->LockRect( &lockRect, NULL, D3DLOCK_READONLY );
            if ( FAILED( hr ) ) { 
                MessageBox( NULL, "GetDepthStencilSurface", 0, 0 ); 
            }
            
            // 獲取指向表面區(qū)域指針
            float* pData = (float*)lockRect.pBits;

            // 將深度信息輸出到文件中
            for (int y = 0; y < surfaceDesc.Height; ++y ) {
                for (int x = 0; x < surfaceDesc.Width; ++x ) {
                    int index = y * lockRect.Pitch / 4 + x;
                    fprintf( pFile, "%f  ", pData[index] );
                }
                fprintf( pFile,"\n");
            }
            
            // 解鎖表面鎖定
            pZBuffer->UnlockRect();    
            
            // 釋放接口和文件
            pZBuffer->Release();
            fclose( pFile );