https://bugs.freedesktop.org/show_bug.cgi?id=111621
Bug ID: 111621
Summary: Strange glViewport behaviors with Lima driver
Product: Mesa
Version: 19.1
Hardware: ARM
OS: Linux (All)
Status: NEW
Severity: not set
Priority: not set
Component: Drivers/Gallium/Lima
Assignee: mesa-dev@lists.freedesktop.org
Reporter: voxl...@gmail.com
Created attachment 145310
--> https://bugs.freedesktop.org/attachment.cgi?id=145310&action=edit
test program, screenshots and debug traces
When I use glViewport with non-zero x,y with the lima driver, everything
appears to be clipped at unexpected locations (which does not align with the
viewport). I do not see this behavior with (for example) the llvmpipe driver.
I've attached a test program, a couple of screenshots (lima and llvmpipe
output), the apitrace and other debug output. Both show a 320x240 window with
glViewport(80,60,160,120) containing a triangle. Apitrace replay also displays
as expected. A Full window viewport works as expected. The test program can be
run with 4 arguments to change the arguments to glViewport.
For reference, this is running on an Allwinner R16 (aka A33 I think) which I
gather has some rendition of Mali400 MP2.
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