[Mesa-dev] [PATCH V3 00/30] ARB_texture_view for i965

[Ian Romanick]

On 04/08/2014 01:25 PM, Chris Forbes wrote:
> Ian,
> 
> Would we put that format in a view class by itself?

I think the BGRA8 could go in VIEW_CLASS_32_BITS.  If you create an
RGBA8 view of a BGRA8 texture you'll get swizzled reads.  Given that you
can create a RGB9_E5 view of a RGB10_A2UI texture, I think this is fine.

> -- Chris
> 
> On Wed, Apr 9, 2014 at 7:49 AM, Ian Romanick <idr at freedesktop.org> wrote:
>> On 04/08/2014 02:13 AM, Kenneth Graunke wrote:
>>> On 04/02/2014 01:04 AM, Chris Forbes wrote:
>>>> This series adds ARB_texture_view support for i965 Gen7/7.5.
>>>>
>>>> Significant changes from V2:
>>>>
>>>> - All the assorted post-V2 format fixups are moved to the start of the series.
>>>>   This gives us consistent memory layout for all the formats between which we
>>>>   have to support casting.
>>>> - Texture validation changes are simplified (Eric)
>>>> - CopyTexSubImage respects view parameters.
>>>
>>> Series is:
>>> Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
>>>
>>> I do think it would be worth trying various benchmarks and games against
>>> the series, to see if the RGBA vs. BGRA swizzling issue makes much of a
>>> difference.  It will probably change some things, but I don't have a
>>> good sense of how.
>>
>> I believe the losing BGRA is going to hurt web browsers... Eric also
>> indicated that it would hurt Glamor.  I think we should add an extension
>> that enables BGRA for TexStorage.  On ES, EXT_texture_storage +
>> APPLE_texture_format_BGRA8888 does this by adding GL_BGRA8_EXT as an
>> internal format for *only* TexStorage.
>>
>>> I'll also need to port this to Gen8...
>>>
>>> Nice work, Chris!  Thanks for doing this.
>>>
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