How do I declare a sampler (ps_4_0, outside of the effects framework) to pass as the first argument to SampleCmpLevelZero()?
If I use a sampler I normally use to sample a texture object, the compiler gives me:
error X3017: 'SampleCmpLevelZero': cannot implicitly convert from 'const SamplerState' to 'const SamplerComparisonState'.
The SDK documentation only has pages on how they are either declared in an effect or in assembly: dcl_sampler sN, comparison.
Thanks
Declaring comparison samplers
In your app code, you create an ID3D10SamplerState with a D3D10_SAMPLER_DESC containing your sampling and comparison states. Then when you want to use it, you bind it to a slot for a shader stage using ID3D10Device::PSSetSamplers (or the equivalent for the stage you want). Then in your HLSL, you declare a SamplerComparisonState bound to the slot you specified for your sampler state. So if you bound it to 0, you would do this:
Then you can pass that state to SampleCmp.
SamplerComparisonState ShadowSampler : register(s0);Then you can pass that state to SampleCmp.
Author
I was trying to SampleCmp() from a Texture2DArray, which is not supported for ps_4_0.
The SDK mentions both the keywords "sampler" and "SamplerState" and when passing a SamplerComparisonState object didn't work for me, I falsely assumed the capitalized versions had to be only valid inside the scope of the effect system.
The SDK mentions both the keywords "sampler" and "SamplerState" and when passing a SamplerComparisonState object didn't work for me, I falsely assumed the capitalized versions had to be only valid inside the scope of the effect system.
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