He was probably talking about the gallium swrast (softpipe/llvmpipe).
I don't know of anybody using classic swrast (except classic drivers
as software fallback).
All Gallium formats are array-based except those which can't be arrays
like 332, 565, 5551, 4444, 10_10_10_2, 11_11_10, 24_8, 8_24, 32_8_24,
and oddities like mixed signed/unsigned components in
R8SG8SB8UX8U_NORM.
The function "is_array" in u_format_parse.py is pretty clear about.
Marek
On Sun, Aug 9, 2015 at 1:43 AM, Jason Ekstrand <ja...@jlekstrand.net> wrote:
> On Sat, Aug 8, 2015 at 3:14 PM, Oded Gabbay <oded.gab...@gmail.com> wrote:
>> On Sun, Aug 9, 2015 at 12:26 AM, Jason Ekstrand <ja...@jlekstrand.net> wrote:
>>> On Sat, Aug 8, 2015 at 2:14 PM, Roland Scheidegger <srol...@vmware.com>
>>> wrote:
>>>> Am 08.08.2015 um 22:45 schrieb Jason Ekstrand:
>>>>> Mesa formats and gallium formats are defined a bit differently. In mesa
>>>>> there are "packed" formats which are based on byte-order within a 8, 16,
>>>>> or
>>>>> 32-bit word and there are "array" formats which are simply an array of 8,
>>>>> 16, or 32-bit values. In gallium, they do something different called
>>>>> "plain" which I've never been able to fully understand. However, for
>>>>> those
>>>>> formats which mesa defines as "packed", they should match up 1-1 with the
>>>>> corresponding "plane" gallium format.
>>>> "plain" I guess.
>>>> Though plain in gallium really just means the layout and components can
>>>> be defined in generic terms.
>>>>
>>>> FWIW I think gallium's definition of array formats makes more sense. If
>>>> all channels are the same width and the channel width is divisible by 8,
>>>> then it is an array format. That is kinda obvious, you could easily
>>>> address that in c (with byte, short or int members) as an array. The
>>>
>>> Right. mesa is more explicit; It's either an array format or a packed
>>> format.
>>>
>>> Are you saying that the gallium A8R8G8B8 format is an array format
>>> with the same array-based channel ordering on both LE and BE? If so
>>> then I have, once again, failed to understand gallium formats and this
>>> patch is bogus.
>>>
>>> Just to be 100% clear MESA_FORMAT_R8G8B8A8 is defined as ((A << 24) |
>>> (B << 16) | (G << 8) | (R << 0)).
>>>
>>>> auto-generated format handling code obviously uses this - if you define
>>>> such formats as packed instead the code would fetch all elements at once
>>>> and shuffle things into place.
>>>> I have no idea what array format means in core mesa, why exactly isn't
>>>> the standard rgba8 stuff not an array format? Maybe that comes from some
>>>
>>> Good question. It certainly could be done either way for 8888-style
>>> things. To be honest, I don't really know. Probably some history in
>>> there.
>>>
>>>> OpenGL oddities (the UNSIGNED_INT_8_8_8_8 vs. UNSIGNED_INT_8_8_8_8_REV
>>>> stuff is always fun stuff, and one of them will match UNSIGNED_BYTE on
>>>> big endian the other on little endian...) which gallium ultimately
>>>> doesn't care much about.
>>>>
>>>> (As for the patch I can't review that, thinking about endianness issues
>>>> just gives me a headache.)
>>>
>>> Me too.
>>>
>> Same here but I don't have a choice as its my job ;)
>>
>>>> Roland
>>>>
>>>>
>>>>
>>>>>
>>>>> Unfortunately, st_format.c was using the endian-dependent wrappers such as
>>>>> PIPE_FORMAT_ARGB_8888 that are defined in p_format.h and mapping them to
>>>>> MESA_FORMAT_A8R8G8B8. On little-endian systems, this is fine but on
>>>>> big-endian systems, it breaks because it introduces one extra byte-swap.
>>>>>
>>>>> Cc: Brian Paul <bri...@vmware.com>
>>>>> Cc: Oded Gabbay <oded.gab...@gmail.com>
>>>>> ---
>>>>> src/mesa/state_tracker/st_format.c | 94
>>>>> +++++++++++++++++++-------------------
>>>>> 1 file changed, 47 insertions(+), 47 deletions(-)
>>>>>
>>>>> diff --git a/src/mesa/state_tracker/st_format.c
>>>>> b/src/mesa/state_tracker/st_format.c
>>>>> index db7b5b7..f946f24 100644
>>>>> --- a/src/mesa/state_tracker/st_format.c
>>>>> +++ b/src/mesa/state_tracker/st_format.c
>>>>> @@ -58,21 +58,21 @@ st_mesa_format_to_pipe_format(struct st_context *st,
>>>>> mesa_format mesaFormat)
>>>>> {
>>>>> switch (mesaFormat) {
>>>>> case MESA_FORMAT_A8B8G8R8_UNORM:
>>>>> - return PIPE_FORMAT_ABGR8888_UNORM;
>>>>> + return PIPE_FORMAT_A8B8G8R8_UNORM;
>>>>> case MESA_FORMAT_R8G8B8A8_UNORM:
>>>>> - return PIPE_FORMAT_RGBA8888_UNORM;
>>>>> + return PIPE_FORMAT_R8G8B8A8_UNORM;
>>>>> case MESA_FORMAT_B8G8R8A8_UNORM:
>>>>> - return PIPE_FORMAT_BGRA8888_UNORM;
>>>>> + return PIPE_FORMAT_B8G8R8A8_UNORM;
>>>>> case MESA_FORMAT_A8R8G8B8_UNORM:
>>>>> - return PIPE_FORMAT_ARGB8888_UNORM;
>>>>> + return PIPE_FORMAT_A8R8G8B8_UNORM;
>>>>> case MESA_FORMAT_X8B8G8R8_UNORM:
>>>>> - return PIPE_FORMAT_XBGR8888_UNORM;
>>>>> + return PIPE_FORMAT_X8B8G8R8_UNORM;
>>>>> case MESA_FORMAT_R8G8B8X8_UNORM:
>>>>> - return PIPE_FORMAT_RGBX8888_UNORM;
>>>>> + return PIPE_FORMAT_R8G8B8X8_UNORM;
>>>>> case MESA_FORMAT_B8G8R8X8_UNORM:
>>>>> - return PIPE_FORMAT_BGRX8888_UNORM;
>>>>> + return PIPE_FORMAT_B8G8R8X8_UNORM;
>>>>> case MESA_FORMAT_X8R8G8B8_UNORM:
>>>>> - return PIPE_FORMAT_XRGB8888_UNORM;
>>>>> + return PIPE_FORMAT_X8R8G8B8_UNORM;
>>>>> case MESA_FORMAT_B5G5R5A1_UNORM:
>>>>> return PIPE_FORMAT_B5G5R5A1_UNORM;
>>>>> case MESA_FORMAT_B4G4R4A4_UNORM:
>>>>> @@ -154,13 +154,13 @@ st_mesa_format_to_pipe_format(struct st_context
>>>>> *st, mesa_format mesaFormat)
>>>>> case MESA_FORMAT_BGR_SRGB8:
>>>>> return PIPE_FORMAT_R8G8B8_SRGB;
>>>>> case MESA_FORMAT_A8B8G8R8_SRGB:
>>>>> - return PIPE_FORMAT_ABGR8888_SRGB;
>>>>> + return PIPE_FORMAT_A8B8G8R8_SRGB;
>>>>> case MESA_FORMAT_R8G8B8A8_SRGB:
>>>>> - return PIPE_FORMAT_RGBA8888_SRGB;
>>>>> + return PIPE_FORMAT_R8G8B8A8_SRGB;
>>>>> case MESA_FORMAT_B8G8R8A8_SRGB:
>>>>> - return PIPE_FORMAT_BGRA8888_SRGB;
>>>>> + return PIPE_FORMAT_B8G8R8A8_SRGB;
>>>>> case MESA_FORMAT_A8R8G8B8_SRGB:
>>>>> - return PIPE_FORMAT_ARGB8888_SRGB;
>>>>> + return PIPE_FORMAT_A8R8G8B8_SRGB;
>>>>> case MESA_FORMAT_RGBA_FLOAT32:
>>>>> return PIPE_FORMAT_R32G32B32A32_FLOAT;
>>>>> case MESA_FORMAT_RGBA_FLOAT16:
>>>>> @@ -199,13 +199,13 @@ st_mesa_format_to_pipe_format(struct st_context
>>>>> *st, mesa_format mesaFormat)
>>>>> case MESA_FORMAT_R_UNORM16:
>>>>> return PIPE_FORMAT_R16_UNORM;
>>>>> case MESA_FORMAT_R8G8_UNORM:
>>>>> - return PIPE_FORMAT_RG88_UNORM;
>>>>> + return PIPE_FORMAT_R8G8_UNORM;
>>>>> case MESA_FORMAT_G8R8_UNORM:
>>>>> - return PIPE_FORMAT_GR88_UNORM;
>>>>> + return PIPE_FORMAT_G8R8_UNORM;
>>>>> case MESA_FORMAT_R16G16_UNORM:
>>>>> - return PIPE_FORMAT_RG1616_UNORM;
>>>>> + return PIPE_FORMAT_R16G16_UNORM;
>>>>> case MESA_FORMAT_G16R16_UNORM:
>>>>> - return PIPE_FORMAT_GR1616_UNORM;
>>>>> + return PIPE_FORMAT_G16R16_UNORM;
>>>>> case MESA_FORMAT_RGBA_UNORM16:
>>>>> return PIPE_FORMAT_R16G16B16A16_UNORM;
>>>>>
>>>>> @@ -357,7 +357,7 @@ st_mesa_format_to_pipe_format(struct st_context *st,
>>>>> mesa_format mesaFormat)
>>>>> case MESA_FORMAT_G8R8_SNORM:
>>>>> return PIPE_FORMAT_GR88_SNORM;
>>>>> case MESA_FORMAT_R8G8B8A8_SNORM:
>>>>> - return PIPE_FORMAT_RGBA8888_SNORM;
>>>>> + return PIPE_FORMAT_R8G8B8A8_SNORM;
>>>>> case MESA_FORMAT_A8B8G8R8_SNORM:
>>>>> return PIPE_FORMAT_ABGR8888_SNORM;
>>>>>
>>>>> @@ -476,21 +476,21 @@ mesa_format
>>>>> st_pipe_format_to_mesa_format(enum pipe_format format)
>>>>> {
>>>>> switch (format) {
>>>>> - case PIPE_FORMAT_ABGR8888_UNORM:
>>>>> + case PIPE_FORMAT_A8B8G8R8_UNORM:
>>>>> return MESA_FORMAT_A8B8G8R8_UNORM;
>>>>> - case PIPE_FORMAT_RGBA8888_UNORM:
>>>>> + case PIPE_FORMAT_R8G8B8A8_UNORM:
>>>>> return MESA_FORMAT_R8G8B8A8_UNORM;
>>>>> - case PIPE_FORMAT_BGRA8888_UNORM:
>>>>> + case PIPE_FORMAT_B8G8R8A8_UNORM:
>>>>> return MESA_FORMAT_B8G8R8A8_UNORM;
>>>>> - case PIPE_FORMAT_ARGB8888_UNORM:
>>>>> + case PIPE_FORMAT_A8R8G8B8_UNORM:
>>>>> return MESA_FORMAT_A8R8G8B8_UNORM;
>>>>> - case PIPE_FORMAT_XBGR8888_UNORM:
>>>>> + case PIPE_FORMAT_X8B8G8R8_UNORM:
>>>>> return MESA_FORMAT_X8B8G8R8_UNORM;
>>>>> - case PIPE_FORMAT_RGBX8888_UNORM:
>>>>> + case PIPE_FORMAT_R8G8B8X8_UNORM:
>>>>> return MESA_FORMAT_R8G8B8X8_UNORM;
>>>>> - case PIPE_FORMAT_BGRX8888_UNORM:
>>>>> + case PIPE_FORMAT_B8G8R8X8_UNORM:
>>>>> return MESA_FORMAT_B8G8R8X8_UNORM;
>>>>> - case PIPE_FORMAT_XRGB8888_UNORM:
>>>>> + case PIPE_FORMAT_X8R8G8B8_UNORM:
>>>>> return MESA_FORMAT_X8R8G8B8_UNORM;
>>>>> case PIPE_FORMAT_B5G5R5A1_UNORM:
>>>>> return MESA_FORMAT_B5G5R5A1_UNORM;
>>>>> @@ -506,13 +506,13 @@ st_pipe_format_to_mesa_format(enum pipe_format
>>>>> format)
>>>>> return MESA_FORMAT_R10G10B10A2_UNORM;
>>>>> case PIPE_FORMAT_L4A4_UNORM:
>>>>> return MESA_FORMAT_L4A4_UNORM;
>>>>> - case PIPE_FORMAT_LA88_UNORM:
>>>>> + case PIPE_FORMAT_L8A8_UNORM:
>>>>> return MESA_FORMAT_L8A8_UNORM;
>>>>> - case PIPE_FORMAT_AL88_UNORM:
>>>>> + case PIPE_FORMAT_A8L8_UNORM:
>>>>> return MESA_FORMAT_A8L8_UNORM;
>>>>> - case PIPE_FORMAT_LA1616_UNORM:
>>>>> + case PIPE_FORMAT_L16A16_UNORM:
>>>>> return MESA_FORMAT_L16A16_UNORM;
>>>>> - case PIPE_FORMAT_AL1616_UNORM:
>>>>> + case PIPE_FORMAT_A16L16_UNORM:
>>>>> return MESA_FORMAT_A16L16_UNORM;
>>>>> case PIPE_FORMAT_A8_UNORM:
>>>>> return MESA_FORMAT_A_UNORM8;
>>>>> @@ -570,21 +570,21 @@ st_pipe_format_to_mesa_format(enum pipe_format
>>>>> format)
>>>>> return MESA_FORMAT_SRGBA_DXT3;
>>>>> case PIPE_FORMAT_DXT5_SRGBA:
>>>>> return MESA_FORMAT_SRGBA_DXT5;
>>>>> - case PIPE_FORMAT_LA88_SRGB:
>>>>> + case PIPE_FORMAT_L8A8_SRGB:
>>>>> return MESA_FORMAT_L8A8_SRGB;
>>>>> - case PIPE_FORMAT_AL88_SRGB:
>>>>> + case PIPE_FORMAT_A8L8_SRGB:
>>>>> return MESA_FORMAT_A8L8_SRGB;
>>>>> case PIPE_FORMAT_L8_SRGB:
>>>>> return MESA_FORMAT_L_SRGB8;
>>>>> case PIPE_FORMAT_R8G8B8_SRGB:
>>>>> return MESA_FORMAT_BGR_SRGB8;
>>>>> - case PIPE_FORMAT_ABGR8888_SRGB:
>>>>> + case PIPE_FORMAT_A8B8G8R8_SRGB:
>>>>> return MESA_FORMAT_A8B8G8R8_SRGB;
>>>>> - case PIPE_FORMAT_RGBA8888_SRGB:
>>>>> + case PIPE_FORMAT_R8G8B8A8_SRGB:
>>>>> return MESA_FORMAT_R8G8B8A8_SRGB;
>>>>> - case PIPE_FORMAT_BGRA8888_SRGB:
>>>>> + case PIPE_FORMAT_B8G8R8A8_SRGB:
>>>>> return MESA_FORMAT_B8G8R8A8_SRGB;
>>>>> - case PIPE_FORMAT_ARGB8888_SRGB:
>>>>> + case PIPE_FORMAT_A8R8G8B8_SRGB:
>>>>> return MESA_FORMAT_A8R8G8B8_SRGB;
>>>>> case PIPE_FORMAT_R32G32B32A32_FLOAT:
>>>>> return MESA_FORMAT_RGBA_FLOAT32;
>>>>> @@ -623,13 +623,13 @@ st_pipe_format_to_mesa_format(enum pipe_format
>>>>> format)
>>>>> return MESA_FORMAT_R_UNORM8;
>>>>> case PIPE_FORMAT_R16_UNORM:
>>>>> return MESA_FORMAT_R_UNORM16;
>>>>> - case PIPE_FORMAT_RG88_UNORM:
>>>>> + case PIPE_FORMAT_R8G8_UNORM:
>>>>> return MESA_FORMAT_R8G8_UNORM;
>>>>> - case PIPE_FORMAT_GR88_UNORM:
>>>>> + case PIPE_FORMAT_G8R8_UNORM:
>>>>> return MESA_FORMAT_G8R8_UNORM;
>>>>> - case PIPE_FORMAT_RG1616_UNORM:
>>>>> + case PIPE_FORMAT_R16G16_UNORM:
>>>>> return MESA_FORMAT_R16G16_UNORM;
>>>>> - case PIPE_FORMAT_GR1616_UNORM:
>>>>> + case PIPE_FORMAT_G16R16_UNORM:
>>>>> return MESA_FORMAT_G16R16_UNORM;
>>>>>
>>>>> case PIPE_FORMAT_A8_UINT:
>>>>> @@ -772,31 +772,31 @@ st_pipe_format_to_mesa_format(enum pipe_format
>>>>> format)
>>>>> /* signed normalized formats */
>>>>> case PIPE_FORMAT_R8_SNORM:
>>>>> return MESA_FORMAT_R_SNORM8;
>>>>> - case PIPE_FORMAT_RG88_SNORM:
>>>>> + case PIPE_FORMAT_R8G8_SNORM:
>>>>> return MESA_FORMAT_R8G8_SNORM;
>>>>> - case PIPE_FORMAT_GR88_SNORM:
>>>>> + case PIPE_FORMAT_G8R8_SNORM:
>>>>> return MESA_FORMAT_G8R8_SNORM;
>>>>> - case PIPE_FORMAT_RGBA8888_SNORM:
>>>>> + case PIPE_FORMAT_R8G8B8A8_SNORM:
>>>>> return MESA_FORMAT_R8G8B8A8_SNORM;
>>>>> - case PIPE_FORMAT_ABGR8888_SNORM:
>>>>> + case PIPE_FORMAT_A8B8G8R8_SNORM:
>>>>> return MESA_FORMAT_A8B8G8R8_SNORM;
>>>>>
>>>>> case PIPE_FORMAT_A8_SNORM:
>>>>> return MESA_FORMAT_A_SNORM8;
>>>>> case PIPE_FORMAT_L8_SNORM:
>>>>> return MESA_FORMAT_L_SNORM8;
>>>>> - case PIPE_FORMAT_LA88_SNORM:
>>>>> + case PIPE_FORMAT_L8A8_SNORM:
>>>>> return MESA_FORMAT_L8A8_SNORM;
>>>>> - case PIPE_FORMAT_AL88_SNORM:
>>>>> + case PIPE_FORMAT_A8L8_SNORM:
>>>>> return MESA_FORMAT_A8L8_SNORM;
>>>>> case PIPE_FORMAT_I8_SNORM:
>>>>> return MESA_FORMAT_I_SNORM8;
>>>>>
>>>>> case PIPE_FORMAT_R16_SNORM:
>>>>> return MESA_FORMAT_R_SNORM16;
>>>>> - case PIPE_FORMAT_RG1616_SNORM:
>>>>> + case PIPE_FORMAT_R16G16_SNORM:
>>>>> return MESA_FORMAT_R16G16_SNORM;
>>>>> - case PIPE_FORMAT_GR1616_SNORM:
>>>>> + case PIPE_FORMAT_G16R16_SNORM:
>>>>> return MESA_FORMAT_G16R16_SNORM;
>>>>> case PIPE_FORMAT_R16G16B16A16_SNORM:
>>>>> return MESA_FORMAT_RGBA_SNORM16;
>>>>>
>>>>
>>> _______________________________________________
>>> mesa-dev mailing list
>>> mesa-dev@lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/mesa-dev
>>
>> If I understand your patch, instead of using the endian-dependent
>> defines, you use the LE defines all the time when converting
>> pipe<-->mesa formats
>>
>> I'm not saying its wrong, but these endian-dependent defines, e.g.
>> PIPE_FORMAT_ARGB8888_UNORM, are used in more places in the gallium
>> code than in the above two functions. Why change only here and not in
>> all places, i.e removing them ?
>>
>> Also, this fixes only llvmpipe/softpipe. It doesn't fix sw_rast. That
>> is still broken
>
> The fact that sw_rast is broken bothers me. The sw_rast code doesn't
> leave core mesa so it shouldn't be affected by any gallium changes.
> From that perspective, this makes sense. However, sw_rast should be
> using the auto-generated packing/unpacking functions in core mesa.
> Did sw_rast work prior to the readpixels changes? It's possible it
> was already broken.
>
>> I tested this patch on llvmpipe, combined with the previous patch you
>> sent on POWER8 machine running ppc64 (BE)
>> First of all, as I said above, it fixes the piglit sanity test.
>> Second, it seems that it improves piglit gpu.py results much more than
>> my patch. "Only" 1368 tests failed, vs. a bit more than 2000 with my
>> patch. Still a lot higher than the ~600 tests that fail on ppc64le
>
> I'm not surprised that it didn't get to zero regressions vs. ppc64le.
> This patch was just kind of thrown together and I didn't check all of
> the formats. Also, as per my conversation with rolland, I may be
> misunderstanding the PIPE_FORMAT enums.
>
> Really, this is a problem that is going to have to be chased by
> someone other than me. I have no BE hardware, so I can't really chase
> it down. I I also have very limited gallium knowledge so I'm probably
> not the best person to start chasing it through gallium. All I've
> done so far is throw darts at the wall. I'm sure this patch is
> incomplete and, to be honest, I didn't even compile-test it as I don't
> usually build gallium. What i do know is that, for the most part, the
> core mesa code is consistent with itself as far as endianness goes.
>
> If you want to see what a given format means in a more explicit
> fashion, just look at the auto-generated format_pack.c and
> format_unpack.c files. gallium has similar auto-generated format
> packing functions. If you can digest what each of them means on BE,
> then it should be pretty obvious how to match things up.
> --Jason
>
> P.S. Thanks for bringing this up and taking the time to look into it.
> Mesa claims to work on BE but, as you've clearly demonstrated, it's
> completely broken. I'm sure we'd all like to see it working again.
> _______________________________________________
> mesa-dev mailing list
> mesa-dev@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/mesa-dev
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