Bug#1118780: gtk4: Mipmap tests fail 16/32-bit pixel format conversions due to memory alignment issues

[John Paul Adrian Glaubitz]

On Sat, 2025-10-25 at 22:12 +0200, John Paul Adrian Glaubitz wrote:
> On Sat, 2025-10-25 at 21:46 +0200, Gregor Riepl wrote:
> > > I have tested your patch now and it seems it just reduced the number of failures by one.
> > 
> > There's already a workaround for the "Missing JIT" error, but it seems to be broken on sparc...
> > 
> > https://salsa.debian.org/gnome-team/gtk4/-/blob/debian/latest/debian/rules?ref_type=heads#L279-294
> 
> Well, for some reason the setting "export GALLIUM_DRIVER=softpipe" is ignored. I'm currently
> reading the Mesa documentation to figure out why that's the case.

Oh, nice. Setting "export DRAW_USE_LLVM=0" gets the failures down to 4:

--- debian/rules.orig   2025-10-14 03:51:42.000000000 +0200
+++ debian/rules        2025-10-25 22:13:13.930249247 +0200
@@ -282,6 +282,7 @@
 ifneq ($(filter mips% powerpc sparc%,$(DEB_HOST_ARCH_CPU)),)
 $(info Disabling use of llvmpipe on this CPU)
 export GALLIUM_DRIVER=softpipe
+export DRAW_USE_LLVM=0
 # https://bugs.debian.org/1077178
 ignore_reftests += label-shadows
 # These succeed with llvmpipe, but fail with softpipe

Result:

Ok:                723
Fail:              4
Skipped:           28

Adrian

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