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List: mesa3d-dev
Subject: Re: [Mesa-dev] [PATCH 1/9] compiler: Add new system value SYSTEM_VALUE_BASE_VERTEX_ID
From: Neil Roberts <nroberts () igalia ! com>
Date: 2017-11-30 20:43:54
Message-ID: 87r2sfwl85.fsf () yahoo ! co ! uk
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Kenneth Graunke <kenneth@whitecape.org> writes:
> We have a number of similar names now:
>
> SYSTEM_VALUE_BASE_VERTEX
> SYSTEM_VALUE_BASE_VERTEX_ID
> SYSTEM_VALUE_VERTEX_ID
> SYSTEM_VALUE_VERTEX_ID_ZERO_BASE
>
> BASE_VERTEX and BASE_VERTEX_ID are really similar names, and honestly
> either one seems like it could be the name for gl_BaseVertex. I'm
> afraid it would be easy to mix them up by mistake. IMHO, it would be
> nice to pick a different word, just to keep some distinction between
> the two fairly related concepts...
>
> Perhaps SYSTEM_VALUE_FIRST_VERTEX...? That's only half the meaning,
> but it at least uses a different word, and makes you think "do I want
> BASE_VERTEX or FIRST_VERTEX?"
Yes, naming this thing is really difficult. I'm not sure if you noticed,
but for Vulkan, the BaseVertex builtin should actually have the value of
BASE_VERTEX_ID unlike GL. So if we rename BASE_VERTEX to something
without "base vertex" in it then it will still be confusing for Vulkan.
So effectively the descriptive names are like:
SYSTEM_VALUE_BASE_VERTEX_ON_GL_BUT_NOT_VULKAN
SYSTEM_VALUE_BASE_VERTEX_ON_VULKAN_OR_OFFSET_FOR_VERTEX_ID_ON_GL
I'm not sure whether that's enough of an argument against FIRST_VERTEX
though, so personally I don't really mind either way.
Antia, what do you think?
Regards,
- Neil
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