[Piglit] default piglit window size change

Eric Anholt eric at anholt.net
Wed Nov 7 09:23:17 PST 2012

Brian Paul <brianp at vmware.com> writes:

> On 11/04/2012 01:11 PM, Eric Anholt wrote:
>> Brian Paul<brianp at vmware.com>  writes:
>>> On 11/02/2012 10:52 AM, Paul Berry wrote:
>>>> On 2 November 2012 09:32, Brian Paul<brianp at vmware.com
>>>> <mailto:brianp at vmware.com>>  wrote:
>>>>      I think I've brought this up in the past.  On Windows, the minimum
>>>>      width of a window is 116 pixels (at least in my current Win7
>>>>      setup). A lot of piglit tests create 100x100 pixels and when
>>>>      piglit creates the window, Win7 resizes it to 116x100.  The
>>>>      framework code detects this change and reports:
>>>>      Got spurious window resize in automatic run (100,100 to 116,100)
>>>>      PIGLIT: {'result': 'warn'}
>>>>      So a bunch of tests get the 'warn' result instead of being run
>>>>      properly.  I think this changed at some point during the recent
>>>>      framework/waffle overhaul.
>>>>      My proposal for this is to set a default window size of 150x150 in
>>>>      the piglit-framework-gl.h header:
>>>>      --- a/tests/util/piglit-framework-__gl.h
>>>>      +++ b/tests/util/piglit-framework-__gl.h
>>>>      @@ -216,6 +216,13 @@ piglit_gl_test_run(int argc, char *argv[],
>>>>                \
>>>>                        config.init = piglit_init;          \
>>>>                        config.display = piglit_display;          \
>>>>      +         \
>>>>      +                /* Default window size.  Note: Win7's min window
>>>>      width */    \
>>>>      +               /* seems to be 116 pixels.  When the window size
>>>>      is */       \
>>>>      +                /* unexpectedly resized, tests are marked as
>>>>      "WARN". */      \
>>>>      +                /* Let's use a larger default to avoid that. */
>>>>             \
>>>>      +                config.window_width = 150;         \
>>>>      +                config.window_height = 150;
>>>>        #define PIGLIT_GL_TEST_CONFIG_END          \
>>>>      And then remove these config lines from a bunch of tests:
>>>>              config.window_width = 100;
>>>>              config.window_height = 100;
>>>>      Of course, I'll have to inspect these tests to make sure they
>>>>      don't rely on that specific window size, but I bet few if any of
>>>>      them do.
>>>>      This change fixes things here.
>>>>      Sound OK?
>>>>      -Brian
>>>> Sounds reasonable to me.  I like the idea of having a default window
>>>> size, since a lot of piglit tests just paint the whole window with the
>>>> same color, so for those tests the size is pretty much irrelevant :)
>>> And there's quite a few tests that don't draw anything at all.
>>> I'll post my first batch of patches soon.  There'll be more as I get time.
>> I don't like how this turned out, really.  On our side, we'd like to see
>> tests that don't care about size rendered to smaller buffers, since we
>> run tests under simulation for HW bringup.  I don't like losing the
>> information that the test author had about requested size, even though
>> in many cases the author just copy and pasted.
>> There are two things I'd like to see done with regards to test size:
> Hmm, I really don't have time to investigate and implement a more 
> elaborate solution right now.  And I think Chad should definitely be 
> involved in any such changes.  Chad, do you have time to look into 
> this in the near future?
> I'd really like to move forward with my changes as-is so we can get 
> things working on Windows.  I'd be happy to help with the follow-on 
> changes if we decide to do something fancier.

I would prefer to just disable the gnome-shell workaround on windows for
the moment instead.

>> - Have a "I don't draw anything" flag (or maybe just ask for 1x1) in
>>    tests that don't need the window system buffer.
>> - Convert the remaining tests that aren't specific to window system
>>    buffer interactions to run with an FBO as the framebuffer.  This
>>    avoids window systems (including gnome-shell) screwing with our window
>>    size, and should improve performance slightly if we take advantage of
>>    surfaceless contexts.  Now that swapbuffers has been replaced, I think
>>    this should be easy.
> One problem I have with this is losing the ability to see what's 
> drawn.  That can be super helpful for debugging a failure.

Huh?  I was talking about converting more things to -auto -fbo for
all.tests like we've been slowly doing.

> But still, it's important to test window rendering too because of the 
> upside down orientation difference with windows vs. FBOs.  In the past 
> we've certainly had bugs in that area, and probably will in the future 
> too.  If the 'general' tests were run both in window and FBO mode 
> that'd probably catch most of the orientation bugs.

I agree, though mostly it's been the other way around because we only
test things in windows not fbos.  The solution to that problem is to
explicitly test interactions of various kinds of drawing to all
available window systems (GLX, EGL, fbos), while leaving most testing up
to a default window system choice.

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