Strange glViewport behaviors with Lima driver

Submitted by Luke Tucker

Assigned to mes..@..op.org

Link to original bug (#111621)

Description

Created attachment 145310 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.

Attachment 145310, "test program, screenshots and debug traces":
lima_glViewport.tgz

Version: git