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I'm rendering to a depth map in order to use it as a shader resource view, but when I sample the depth map in my shader, the red component has a value of 1 while all other channels have a value of 0.

The Texture2D I use to create the DepthStencilView is bound with the D3D11_BIND_DEPTH_STENCIL | D3D11_BIND_SHADER_RESOURCE flags, the DepthStencilView has the DXGI_FORMAT_D32_FLOAT format, and the ShaderResourceView's format is D3D11_SRV_DIMENSION_TEXTURE2D.

I'm setting the depth map render target, then i'm drawing my scene, and once that is done, I'm the back buffer render target and depth stencil are set on the output merger, and I'm using the depth map shader resource view as a texture in my shader, but the depth value in the red channel is constantly 1. I'm not getting any runtime errors from D3D, and no compile time warning or anything.

I'm not sure what I'm missing here at all. I have the impression the depth value is always being set to 1.

I have not set any depth/stencil states, and AFAICT depth writing is enabled by default. The geometry is being rendered correctly so I'm pretty sure depth writing is enabled.

The device is created with the appropriate debug flags;

#if defined(DEBUG) || defined(_DEBUG)
    deviceFlags |= D3D11_CREATE_DEVICE_DEBUG | D3D11_RLDO_DETAIL;
#endif

This is how I create my depth map. I've omitted error checking for the sake of brevity

D3D11_TEXTURE2D_DESC td;

td.Width     = width;
td.Height    = height;
td.MipLevels = 1;
td.ArraySize = 1;
td.Format    = DXGI_FORMAT_R32_TYPELESS;
td.SampleDesc.Count   = 1;  
td.SampleDesc.Quality = 0;  
td.Usage          = D3D11_USAGE_DEFAULT;
td.BindFlags      = D3D11_BIND_DEPTH_STENCIL | D3D11_BIND_SHADER_RESOURCE;
td.CPUAccessFlags = 0; 
td.MiscFlags      = 0;
_device->CreateTexture2D(&texDesc, 0, &this->_depthMap);

D3D11_DEPTH_STENCIL_VIEW_DESC dsvd;
ZeroMemory(&dsvd, sizeof(dsvd));
dsvd.Format = DXGI_FORMAT_D32_FLOAT;
dsvd.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;
dsvd.Texture2D.MipSlice = 0;
_device->CreateDepthStencilView(this->_depthMap, &dsvd, &this->_dmapDSV);

D3D11_SHADER_RESOURCE_VIEW_DESC srvd;
srvd.Format = DXGI_FORMAT_R32_FLOAT;
srvd.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
srvd.Texture2D.MipLevels = texDesc.MipLevels;
srvd.Texture2D.MostDetailedMip = 0;
_device->CreateShaderResourceView(this->_depthMap, &srvd, &this->_dmapSRV);
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    \$\begingroup\$ 1 is a typical clear depth value -- are you sure that when your scene is rendered, you've actually got depth writing enabled? Can you post some code? And did you make sure to create the D3D11 device with the "debug" flag to get all the debug output? \$\endgroup\$
    – user1430
    Nov 15, 2011 at 16:44
  • \$\begingroup\$ Don't forget to use PIX debugger, that could help to debug this kind of problem \$\endgroup\$
    – xoofx
    Nov 17, 2011 at 1:46
  • \$\begingroup\$ I've used PIX to check the values in the buffer, same problem, all texel have a value of 1. \$\endgroup\$
    – dotminic
    Nov 24, 2011 at 20:00

1 Answer 1

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Depth-writing being enabled is definitely the first thing to check. If I had $5 for every time I thought something was definitely enabled by default...

So try explicitly enabling it just to be absolutely certain. Also double-check your depth range and ensure that it's not something like minz 1 and maxz 1 (which would give the same result even with depth writing enabled).

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  • \$\begingroup\$ Depth-writing is enabled, and the min/max depth values for the viewport are 0/1. \$\endgroup\$
    – dotminic
    Nov 15, 2011 at 20:35
  • \$\begingroup\$ Wow good call about min/max z, never would have thought to look for that, but they were both in fact set to 1. \$\endgroup\$
    – eodabash
    Dec 17, 2013 at 6:11

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