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获取Streaming output�l�计信息��p�|

Mon, 09 May 2011 04:47:00 GMT

��Z��GPU的粒子系�l�的�_�子数目一般等于stream output的图元数�Q�而stream output的统计信息可以通过ID3D10Query接口获取。步骤如下：
1.创徏ID3D10Query查询对象

1ID3D10Query* pQuery;
2D3D10_QUERY_DESC queryDesc;
3queryDesc.Query = D3D10_QUERY_SO_STATISTICS;
4queryDesc.MiscFlags = 0;
5pD3DDevice->CreateQuery( &queryDesc, &pQuery );

2.在用DrawAuto()�l�制�_�子处设�|�查询的开始和�l�束标记�Q?/span>

1 pQuery->Begin();
2 pD3DDevice->DrawAuto(); // �l�制�_�子
3 pQuery->End();

3. 获取Stream Output输出的图元个敎ͼ�

1 D3D10_QUERY_DATA_SO_STATISTICS streamOutBufferSize;
2 if ( S_OK == pQuery->GetData( &streamOutBufferSize, pQuery->GetDataSize(), 0 ) ) // 错误产生的原�?br>3 {
4 mStreamOutParticleSize = (unsigned)streamOutBufferSize.NumPrimitivesWritten;
5 }

可是试验的时候，发现获取的粒子数目不正确。调试后发现ID3D10Query::GetData()总返回S_FALSE�Q�但极少数情况下也返回S_OK。参考文�?后明白，ID3D10Query接口是异步从GPU获取数据�?当GPU中繁忙或者查询的数据没有准备好，��׃��q�回S_FALSE。正��的做法是：如果ID3D10Query::GetData()�q�回��p�|�Q�则�l�箋查询�Q�直到成功�ؓ止。正��的完整代码如下�Q?br>

1 // 创徏ID3D10Query查询对象
2 ID3D10Query* pQuery;
3 D3D10_QUERY_DESC queryDesc;
4 queryDesc.Query = D3D10_QUERY_SO_STATISTICS;
5 queryDesc.MiscFlags = 0;
6 pD3DDevice->CreateQuery( &queryDesc, &pQuery );
7
8 // 讄��查询的开始和�l�束标志
9 pQuery->Begin();
10 pD3DDevice->DrawAuto();
11 pQuery->End();
12
13 // 获取stream output输出的图元个�?nbsp;
14 D3D10_QUERY_DATA_SO_STATISTICS streamOutBufferSize;
15 while ( S_OK != pQuery->GetData( &streamOutBufferSize, pQuery->GetDataSize(), 0 ) ); // 不停循环�Q�直到成�?/span>
16 mStreamOutParticleSize = (unsigned)streamOutBufferSize.NumPrimitivesWritten;

   参考资料：
   1. Get streaming output statistics: http://www.bennychen.cn/2009/07/get-streaming-output-statistics/

��乌�?/a> 2011-05-09 12:47 发表评论

PIX Experiment File Version Mismatch

Sat, 07 May 2011 16:48:00 GMT

   使用PIX调试Direct3D�E�序�Ӟ��PIX出错不能�q�行�Q�如下图所�C�：

   原因是PIX调试的程序的路径必须是英文，解决办法是修改被调试的程序的路径�Q��之不包含中文�?br>
   参考文献：
   PIX调式shader�ȝ��教程�Q?a >http://blog.csdn.net/rabbit729/archive/2011/01/14/6139308.aspx
   Direct3D�E�序调试技巧：http://hi.baidu.com/xiexianyu/blog/item/6a6944ec84bd9fdd2f2e21ab.html

��乌�?/a> 2011-05-08 00:48 发表评论

Wed, 06 Jan 2010 11:02:00 GMT

DirectX中，如何获取深度��|��然后��它存储在一个txt文�g中？其实只要修改两个地方�Q?br> �W�一个地�Ҏ��Q�创建Direct3D讑֤��Ӟ��D3DPRESENT_PARAMETERS�c�d��表示变量的AutoDepthStencilFormat讄��为D3DFMT_D32F_LOCKABLE�Q�代码如下：

    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��M��?/span>
    d3dpp.Flags                      = 0;
    d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
    d3dpp.PresentationInterval       = D3DPRESENT_INTERVAL_IMMEDIATE;

�W�二个地�Ҏ��Q�设�|�锁定缓存表面，�q�进行读写的代码�Q?br>

// 获取深度模板表面
            HRESULT hr = Device->GetDepthStencilSurface( &pZBuffer );
            if ( FAILED( hr ) ) {
                MessageBox( NULL, "GetDepthStencilSurface failure", 0, 0 );
            }

            // 打开文�g
            pFile = fopen( "ZBuffer.txt", "w" );
            if ( pFile == NULL ) {
                MessageBox( NULL, "shit", NULL, NULL);
            }

            // 获取表面�Ҏ�?/span>
            D3DSURFACE_DESC surfaceDesc;
            pZBuffer->GetDesc( &surfaceDesc );

            // 锁定表面
            D3DLOCKED_RECT lockRect;
            hr = pZBuffer->LockRect( &lockRect, NULL, D3DLOCK_READONLY );
            if ( FAILED( hr ) ) {
                MessageBox( NULL, "GetDepthStencilSurface", 0, 0 );
            }

            // 获取指向表面区域指针
            float* pData = (float*)lockRect.pBits;

            // ��深度信息输出到文�g�?/span>
            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");
            }

            // 解锁表面锁定
            pZBuffer->UnlockRect();

            // 释放接口和文�?/span>
            pZBuffer->Release();
            fclose( pFile );

��乌�?/a> 2010-01-06 19:02 发表评论