[Mesa-dev] [PATCH] mesa: Clamp ValueMask to [0, 255].

[Kenneth Graunke]

On Sunday, December 18, 2016 11:33:49 AM PST Chris Forbes wrote:
> I don't see any spec justification for masking this. dEQP is broken here.
> Implementations have the flexibility to retain more bits in the mask (and
> have more bits set in the initial state) than the depth of the deepest
> stencil buffer supported. From the ES3 spec, 4.1.4, second to last para:
> 
>    "In the initial state, ... , and the front and back stencil mask are
> both set to the value 2^s - 1, where s is greater than or equal to the
> number of bits in the deepest stencil buffer supported by the GL
> implementation"
> 
> /ref/ is specified as being clamped on use and on query, which ought to be
> indistinguishable from clamping it upfront.
> 
> - Chris

You're right, this is a hack.  I don't think we should do it.

I don't think dEQP is broken, though - I've got a better idea for how to
solve the problem.
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