直接x10 水平/垂直翻转纹理

Question

正如我在标题中提到的，您知道如何水平/垂直翻转ID3D10Texture2D对象吗？

我使用此代码截取屏幕截图并将其保存到文件中。

ID3D10Resource *backbufferRes;
renderTargetView->GetResource(&backbufferRes);
ID3D10Texture2D *mRenderedTexture;
// Create our texture
D3D10_TEXTURE2D_DESC texDesc;
texDesc.ArraySize = 1;
texDesc.BindFlags = 0;
texDesc.CPUAccessFlags = 0;
texDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
texDesc.Width = 640;  // must be same as backbuffer
texDesc.Height = 480; // must be same as backbuffer
texDesc.MipLevels = 1;
texDesc.MiscFlags = 0;
texDesc.SampleDesc.Count = 1;
texDesc.SampleDesc.Quality = 0;
texDesc.Usage = D3D10_USAGE_DEFAULT;
d3d10Device->CreateTexture2D(&texDesc, 0, &mRenderedTexture); 
d3d10Device->CopyResource(mRenderedTexture, backbufferRes);
D3DX10FilterTexture(mRenderedTexture, 0, D3DX10_FILTER_MIRROR_U);
D3DX10SaveTextureToFile(mRenderedTexture, D3DX10_IFF_PNG, L"test.png");

D3DX10FilterTexture（mRenderedTexture， 0， D3DX10_FILTER_MIRROR_U）; 行不镜像我的纹理。有什么建议吗？

Answer 1

在着色器中，执行 1-u 水平翻转或 1-v 垂直翻转。

编辑 ：如果您实际上没有进行任何渲染，那么有更好的方法来进行图像处理。 但是，如果您想手动执行此操作，则必须使用地图并自己翻转数据。

您可以按如下方式执行此操作（代码未经过测试，因此请原谅任何编译错误）：

D3D10Resource *backbufferRes;
renderTargetView->GetResource(&backbufferRes);
ID3D10Texture2D *mRenderedTexture;
// Create our texture
D3D10_TEXTURE2D_DESC texDesc;
texDesc.ArraySize = 1;
texDesc.BindFlags = 0;
texDesc.CPUAccessFlags = 0;
texDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
texDesc.Width = 640;  // must be same as backbuffer
texDesc.Height = 480; // must be same as backbuffer
texDesc.MipLevels = 1;
texDesc.MiscFlags = 0;
texDesc.SampleDesc.Count = 1;
texDesc.SampleDesc.Quality = 0;
texDesc.Usage = D3D10_USAGE_DEFAULT;
d3d10Device->CreateTexture2D(&texDesc, 0, &mRenderedTexture); 
d3d10Device->CopyResource(mRenderedTexture, backbufferRes);
D3D10_MAPPED_TEXTURE2D d3d10MT = { 0 };
mRenderedTexture->Map( 0, D3D10_MAP_READ_WRITE, 0, &d3d10MT );
unsigned int* pPix = (unsigned int)d3d10MT.pData;
int rows    = 0;
int rowsMax = height;
while( rows < rowsMax )
{
    unsigned int* pRowStart = pPix + (rows * width);
    unsigned int* pRowEnd   = pRowStart + width;
    std::reverse( pRowStart, pRowEnd );
    rows++;
}
mRenderedTexture->Unmap();
D3DX10SaveTextureToFile(mRenderedTexture, D3DX10_IFF_PNG, L"test.png");

顺便说一句，从文档中：

D3DX10_FILTER_MIRROR_U 纹理边缘的像素 U 轴应该是镜像的，而不是换行的。

因此，当您过滤图像时，仅计算边缘周围的像素。