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directxshaderdirectx-11hlsl

GetResourceBindingDescByName in DirectX 11 can only get the first cbuffer

I'm learning DirectX 11 and have reached basic HLSL part. I want to use multiple constant buffers in vertex shader, so I need to find the correct StartSlot for VSSetConstantBuffers. I searched on Google and found that someone suggested using GetResourceBindingDescByName.

I tried GetResourceBindingDescByName, but found that it can only get the correct StartSlot for the first cbuffer. For example, in my vertex shader:

cbuffer Test1
{
    float4 a;
};

cbuffer Test2
{
    float4 b;
};

Now GetResourceBindingDescByName("Test1", &bind_desc) works correctly, but GetResourceBindingDescByName("Test2", &bind_desc) will fail (return E_INVAILDARG).

Could anyone help me?

Solution

  • The reflection only contains symbols use by a shader. As confirmed in the comments, b was not use, and the problem is solve once b is referenced in the code and not strip away by an optimisation.