[Mesa-dev] [PATCH 1/6] glsl: finish up ARB_conservative_depth

Ian Romanick idr at freedesktop.org
Mon Nov 21 11:01:31 PST 2011

On 11/19/2011 07:42 AM, Marek Olšák wrote:
> On Fri, Nov 18, 2011 at 9:44 PM, Ian Romanick<idr at freedesktop.org>  wrote:
>> On 11/18/2011 11:27 AM, Marek Olšák wrote:
>> This patch also needs to change the _mesa_glsl_supported_extensions table in
>> glsl_parser_extras.cpp.  AMD_conservative_depth is used for both versions of
>> the extension in the table.
> But that refers to the single extension flag in mtypes.h and there's
> only one: the AMD one. Not sure what else I should change in that
> table.

You are correct.  Looking closer at the EXT macro used to generate that 
table, I see why there are two enable bits in _mesa_glsl_parse_state. 
The structure field name and the string come from the same macro parameter.

>> I'm not super convinced that we even need separate enable flags.  Both
>> extensions add the exact same functionality using the exact same layout
>> qualifiers.  It's not a big deal to me either way, though.
> I guess this would end up being incorrect with unified flags:
> #extension GL_AMD_conservative_depth : enable
> #extension GL_ARB_conservative_depth : disable // would disable AMD too

That's an interesting case.  What does AMD's closed-source driver do in 
that case?  I think that's the only other shipping implementation of the 
AMD extensions, so as long as we do what they do...

> Just a thought.
> Marek

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