vc4-kms-v3d-pi4 offscreen quad leaks to the left side of the screen buffer
Nobody has claimed this yet.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- c, linux
- Domain
- computer-graphics, operating-systems
Research direction
Start by reproducing the artifact with vc4-kms-v3d-pi4, max_framebuffers=1, DRM/KMS, and a quad extending beyond the right edge. Compare it with vc4-fkms-v3d and max_framebuffers=2, then trace the Raspberry Pi vc4 KMS/V3D path. Done means the offscreen quad no longer leaks pixels into the left side while the comparison configurations continue to work.
Written by the indexing model from the issue text.
Description
Describe the bug
When I draw a quad that extends beyond the right side of the screen buffer one column of pixels leaks to the left side shifted down by one pixel. This does not happen with vc4-fkms-v3d or if the max_framebuffers=2
To reproduce
dtoverlay=vc4-kms-v3d-pi4
max_framebuffers=1
Window created with DRM/KMS.
Draw a quad with OpenGL that extends beyond the right side of the screen buffer.
System
- PI4
- Raspberry Pi reference 2020-02-13
- version 6379679d1ec6a8c746d7e77e015f5b56b939976f (clean) (release) (start)
- Linux retropie4 5.4.44-v7l+ #1320 SMP Wed Jun 3 16:13:10 BST 2020 armv7l GNU/Linux
Screenshot
- Dominant language
- C
- Stars
- 13.2k
- Forks
- 5.5k
- Avg merge
- 2d 21h
- Merged PRs (30d)
- 21
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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