Yeah… this blog post is well overdue, but better late than never! So yes, I am currently working on progressing the Raspberry Pi 4 Mesa driver stack, together with my Igalian colleagues Piñeiro and Chema, continuing the fantastic work started by Eric Anholt on the Mesa V3D driver.
The Raspberry Pi 4 sports a Video Core VI GPU that is capable of OpenGL ES 3.2, so it is a big update from the Raspberry Pi 3, which could only do OpenGL ES 2.0. Another big change with the Raspberry Pi 4 is that the Mesa v3d driver is the driver used by default with Raspbian. Because both GPUs are quite different, Eric had to write an all new driver for the Raspberry Pi 4, and that is why there are two drivers in Mesa: the VC4 driver is for the Raspberry Pi 3, while the V3D driver targets the Raspberry Pi 4.
As for what we have been working on exactly, I wrote a long post on the Raspberry Pi blog some months ago with a lot of the details, but for those looking for the quick summary:
- Shader compiler optimizations.
- Significant Transform Feedback fixes and improvements.
- Implemented OpenGL Logic Operations.
- A bunch of bugfixes for Piglit test failures.
- Set up a Continuous Integration system to identify regressions.
- Rebased and merge Eric’s work on Compute Shaders.
- Many bug fixes targeting the Khronos OpenGL ES Conformance Test Suite (CTS).
So that’s it for the late news. I hope to do a better job keeping this blog updated with the news this year, and to start with that I will be writing a couple of additional posts to highlight a few significant development milestones we achieved recently, so stay tuned for more!