https://bugs.freedesktop.org/show_bug.cgi?id=53946
Bug #: 53946
Summary: [i965] guardband clipping issue on Sandybridge
Classification: Unclassified
Product: Mesa
Version: git
Platform: x86-64 (AMD64)
OS/Version: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: Mesa core
AssignedTo: mesa-dev@lists.freedesktop.org
ReportedBy: nkalk...@web.de
Created attachment 65969
--> https://bugs.freedesktop.org/attachment.cgi?id=65969
screenshot
Hi,
it seems that guardband clipping on i965(SNB) causes some polygons with normal
vector (0,-1,0) to be clipped. this can be observed with an OpenGL version of
the old DOOM engine. Ceiling planes are being clipped spontaneously while
moving through the scene (see attached screenshot). I've tracked down the bad
commit (85cd30406ff8414bc6ac6de1064d059a4c564160). When I switch off culling
the problem goes away however this comes with the performance panelty.
configure opts:
./configure --prefix=/usr --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info
--datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib
--libdir=/usr/lib64 --disable-dependency-tracking --enable-dri --enable-glx
--disable-debug --disable-egl --disable-gbm --disable-gles1 --disable-gles2
--enable-glx-tls --enable-asm --enable-shared-glapi --disable-xa
--with-dri-drivers=i965 --with-gallium-drivers= --with-egl-platforms=
--disable-gallium-egl --disable-d3d1x --disable-gallium-g3dvl
--disable-gallium-llvm --disable-openvg --disable-r600-llvm-compiler
--disable-vdpau --disable-xvmc
Could someone please confirm the issue?
Thx and Regards
Nic
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