dx11 怎么获得backbuffer 里面的像素
要读和写
ID3D11Resource *ps = 0;
pbackBufferTarget_->GetResource(&ps);/*ID3D11RenderTargetView* pbackBufferTarget_;*/
D3D11_MAPPED_SUBRESOURCE *pm = 0;
pd3dContext_->Map(ps, 0, D3D11_MAP_READ_WRITE, 0, pm);
pd3dContext_->Unmap(ps, 0);
用backbuffer 获得的资源 map方法居然不行