[Bug 63520] New: r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

[Bug 63520] New: r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

          Priority: medium
            Bug ID: 63520
          Assignee: dri-devel@lists.freedesktop.org
           Summary: r300g regression (RV380): Strange rendering of light
                    sources in Penumbra  (bisected)
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: pj_beers@hotmail.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: 9.0
         Component: Drivers/Gallium/r300
           Product: Mesa

Created attachment 77936
  --> https://bugs.freedesktop.org/attachment.cgi?id=77936&action=edit
Bad rendering screen 1

Since mesa-9.0, light is rendered incorrectly in the Penumbra games (Overture,
Black Plague, Requiem). I find it hard to describe so I've included two good
and two bad screenshots from two scenes to illustrate the problem. For, fixing
this bug would mean rendering of light sources as in the "good" screenshots.

I've bisected (between mesa-8.0 and mesa-9.0) and the first bad commit is
134a0a5ff88851c971fb95863317f640b5b9fa3a , r300/compiler: Use the smart
scheduler for r300 cards. I then checked out current master and reverting this
commit fixes the problem in master.

I compiled mesa with the following options:
--with-dri-drivers="radeon,swrast" 
--with-gallium-drivers="r300,swrast"
--enable-gallium-llvm
--enable-texture-float
--enable-gallium-g3dvl
--enable-glx-tls
--enable-motif
--enable-xvmc

My system is Slackware 14.0 with kernel 3.7.6, libdrm-2.4.42 and
xf86-video-ati-7.1.0.

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #1 from PJBrs <pj_beers@hotmail.com> ---
Created attachment 77937
  --> https://bugs.freedesktop.org/attachment.cgi?id=77937&action=edit
Good rendering screen 1

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #2 from PJBrs <pj_beers@hotmail.com> ---
Created attachment 77938
  --> https://bugs.freedesktop.org/attachment.cgi?id=77938&action=edit
Bad rendering screen 2

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #3 from PJBrs <pj_beers@hotmail.com> ---
Created attachment 77939
  --> https://bugs.freedesktop.org/attachment.cgi?id=77939&action=edit
Good rendering screen 2

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

PJBrs <pj_beers@hotmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #77936|text/plain                  |image/png
          mime type|                            |

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #4 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
I've run the Penumbra Requiem game with RADEON_DEBUG=fp,vp and captured the
output. I made two attachments. The file named "Goodlog" is the log with mesa
version snb_magic_9030_g342cac7 (commit
342cac71669662abad3435fd13ecf28d073874c3). The file named "badlog" is the
output with mesa version snb-magic-9031-g134a0a5 (commit
134a0a5ff88851c971fb95863317f640b5b9fa3a). Let me know if any other information
is needed.

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #5 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 78616
  --> https://bugs.freedesktop.org/attachment.cgi?id=78616&action=edit
First bad penumbra output with RADEON_DEBUG=fp,vp

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #6 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 78617
  --> https://bugs.freedesktop.org/attachment.cgi?id=78617&action=edit
Last good penumbra output with RADEON_DEBUG=fp,vp

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #7 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Tom Stellard suggested that I do a binary search for incorrectly rendered
shaders. I first compared debug log differences between old and smart
schedulers. The logs show that eight shader programs are compiled differently
by the two schedulers (I assume that a shader program is identified by
"pc=$number" in the log.) For each of these shader programs I've listed the
number of fragment program instructions and the number of hardware program
instruction, for both old
and smart scheduler:

#instructions:  fp old: fp smart:       hwp old:        hwp smart:
Shader program:
pc=8            14      12              8               7
pc=9            25      24              19              19
pc=10           22      22              17              18
pc=11           9       8               4               4
pc=15           6       5               3               2
pc=17           26      26              18              18
pc=18           20      19              11              11
pc=19           7       6               3               3

fp=fragment program
hwp=hardware program

I then did a binary analysis by trying different numbers for
max_alu_instructions. I started with 15. With max_alu=15, there are some
differences in shading between old and smart schedulers. Same with max_alu=8.
With lower max_alu (tested 4, 6 and 7), these differences disappear. I did not
notice any other differences in rendering between old and smart schedulers for
max_alu=<15. However, I did not yet see the bug that I initially noticed when I
reported it, so I tested further with max_alu=20.

With max_alu=20, the smart scheduler displays the lighting bug that I initially
wanted to report. With max_alu=17 and max_alu=18, rendering is the same as with
max_alu=15 for both old and smart schedulars. With max_alu=19, a new difference
in rendering between old and smart schedulers is introduced. A final difference
 is introduced with max_alu=20, which shows the bug that I originally
saw. So, in sum, at least three shader programs are rendered differently by the
old and smart schedulers--the first difference appears with max_alu=8, the
second with max_alu=19 and the third difference with max_alu=20.

The first difference suggests that "pc=8" is rendered incorrectly, since it has
7 instructions in the smart scheduler. Apparently, it does not do anything with
the old scheduler (which results in 8 instructions), but increasing max_alu
does not change those rendering bits rendered incorrectly by the smart
scheduler. The second difference is either caused by shader program "pc=17",
which consist of 18 instructions in both schedulers, or by "pc=10" which
consists of 17 instructions with the old scheduler and 18 instructions with the
smart scheduler. It's hard to say which shader program is rendered incorrectly
(if not both are), because, with the old scheduler, there are rendering
differences between max_alu=17 and max_alu=18. As the smart renderer shows no
differences between max_alu=17 and max_alu=18, these must be caused by "pc=10".
The third incorrectly rendered shader program would be "pc=9", with 19
instructions.

What would a good starting point for searching the bug be? I think comparing
the compilations for pc=19 and pc=8, because those almost certainly are
rendered incorrectly due to changes in the scheduler. I've added screenshots
and logs insofar I thought was necessary. I have more available, but I don't
want to clog this report. I hope that the filenames speak for themselves :-)
Please let me know what else I can do.

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #8 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 79150
  --> https://bugs.freedesktop.org/attachment.cgi?id=79150&action=edit
Screenshot, maxALU=8, old renderer

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #9 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 79152
  --> https://bugs.freedesktop.org/attachment.cgi?id=79152&action=edit
Screenshot, maxALU=8, smart renderer

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #10 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 79154
  --> https://bugs.freedesktop.org/attachment.cgi?id=79154&action=edit
Log RADEON_DEBUG=fp,vp, maxALU=8, old renderer

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #11 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 79155
  --> https://bugs.freedesktop.org/attachment.cgi?id=79155&action=edit
Log RADEON_DEBUG=fp,vp, maxALU=8, smart renderer

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #12 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 79156
  --> https://bugs.freedesktop.org/attachment.cgi?id=79156&action=edit
Screenshot, maxALU=20, old renderer

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #13 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 79157
  --> https://bugs.freedesktop.org/attachment.cgi?id=79157&action=edit
Screenshot, maxALU=20, smart renderer

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #14 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 79158
  --> https://bugs.freedesktop.org/attachment.cgi?id=79158&action=edit
Log RADEON_DEBUG=fp,vp, maxALU=20, old renderer

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #15 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 79160
  --> https://bugs.freedesktop.org/attachment.cgi?id=79160&action=edit
Log RADEON_DEBUG=fp,vp, maxALU=20, smart renderer

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

PJBrs <pjbrs@floorenpj.xs4all.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #79156|text/plain                  |image/png
          mime type|                            |

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #16 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
To be clear-- with "trying different numbers for max_alu_instructions", I mean
changing c->Base.max_alu_insts into a number (e.g., 15) in line 157 of the file
src/gallium/drivers/r300/compiler/r300_fragprog_emit.c.

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #17 from Tom Stellard <tstellar@gmail.com> ---
Thanks for identifying the bad shaders, this saved me a lot of work.  I spotted
a bug in the "pc=8" shader:

6: TEX temp[1].x, temp[1].z___, 1D[3] SEM_WAIT SEM_ACQUIRE;

This instruction is wrong because TEX instructions can't swizzle their source
operands.  For 1D textures, the coordinate is always read from the x component.

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #18 from Tom Stellard <tstellar@gmail.com> ---
Created attachment 79572
  --> https://bugs.freedesktop.org/attachment.cgi?id=79572&action=edit
Possible Fix

Does this patch fix the bug?  If not can you post the output of
RADEON_DEBUG=fp,vp with this patch applied.

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--- Comment #19 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
Created attachment 79628
  --> https://bugs.freedesktop.org/attachment.cgi?id=79628&action=edit
Log with possible fix

Hi, thanks for the patch! Unfortunately, it does not appear to do anything that
I can see, the bug(s?) are still there. I've attached the log as per your
request. Let me know if I can help in any other way.

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--- Comment #20 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
P.s., I did a quick glance at the difference between the first bad log and the
log with the patch (sdiff badlog  patch-test.log | less). It seems as if shader
pc8 now is truncated or something...

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Tom Stellard <tstellar@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #79572|0                           |1
        is obsolete|                            |
  Attachment #79628|0                           |1
        is obsolete|                            |

--- Comment #21 from Tom Stellard <tstellar@gmail.com> ---
Created attachment 80888
  --> https://bugs.freedesktop.org/attachment.cgi?id=80888&action=edit
Possible fix v2

The first patch I posted was incorrect, so it actually had no effect on the
shader program.  This new patch should fix the issue with texture swizzles. 
Can you test this out?  If the rendering is still incorrect with this new
patch, can you repost the output of RADEON_DEBUG=fp,vp with this patch applied.

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #22 from PJBrs <pjbrs@floorenpj.xs4all.nl> ---
This fixes it!--great, thanks very much! Is this patch already in master? And
will it also go in the 9.0 / 9.1 stable branches?

Anyway, thanks very much again for your time, glad I could be of some help too.

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

Fabio Pedretti <fabio.ped@libero.it> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #23 from Fabio Pedretti <fabio.ped@libero.it> ---
Fixed in master:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=24fa43675f32bc81c7252f3ddce4c80ed8c7737d

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[Bug 63520] r300g regression (RV380): Strange rendering of light sources in Penumbra (bisected)

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https://bugs.freedesktop.org/show_bug.cgi?id=63520

--- Comment #24 from madbiologist <s.j.turner@uqconnect.net> ---
The fix is now also in Mesa 9.1.

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