http://bugs.freedesktop.org/show_bug.cgi?id=10967
Summary: wrong addresses (?) for 3D drawing : clipping or what ?
Product: Mesa
Version: 6.5
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/DRI/Unichrome
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
I own a VIA EPIA800ML, with unichrome graphic adapter. I am using Ubuntu 7.04
with mesa 6.5.2. Dri is installed and works.
The problem appears when using blender or winehq with 3D OpenGL software :
there seems to be an address (offset ???) wrong calculation or clipping when
positionning the 3D window on the screen.
Let me explain with ascii graphics :
The big rectangle is the screen, the small one inside is a 3D window. The
application tries to draw something inside the window, I can only see the part
marked with V. The right and bottom part stays blank.
+-----------------------------+
|xxxxxxxxxx |
|xxxx+--------+ |
|xxxx|VVVVV | |
|xxxx|VVVVV | |
| | | |
| +--------+ |
| |
+-----------------------------+
The 3D scene should be fully visible inside the window BUT seems to be clipped
by the area marked xxx, which has the same size than the window. So I can only
see the part marked VVV - but its origins is correctly in the upper left corner
of the window : it is not drawn in the screen coordinates.
When I move the window, the clipping area stays in (0,0), masking a larger
amount if I move to the right or bottom.
The only way to see the full 3D view is to move the window at screen(0,0).
There is also a same problem with the menus, for instance in blender. Every
menu or widget appears corrupt or blank. I suspect the same problem : the menu
would be cleanly displayed only if at screen(0,0) (?).
Is this a problem with the stencil buffer, the clipping area, the hardware
driver ?
I was thinking of the hardware because :
1) there is generally a lot of noisy pixels around the 3D area : the border of
the window is very dirty, with random lines and pixel patterns (there is no
segmentation failure).
2) the mouse cursor (image) is draw very badly : I can see a white square
around the previous position in the menus
Very surprisingly, there is no problem with glxgears : I can move its window
without any problem (560 fps). Does it use stencils or scissors ?
I would be very interested to help in finding this bug, but I can find no
explanations on the internals of mesa and dri/drm.
Many thanks for all,
Pierre
pierre.nerzic domain free.fr (replace domain by at)
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