I’m a graphics developer passionate about software freedom, working on
the Asahi graphics driver (email). My résumé is available. Select blog posts are available
here or as an RSS feed.
I’m a graphics developer passionate about software freedom, working on
the Asahi graphics driver (email). My résumé is available. Select blog posts are available
here or as an RSS feed.
Je suis une développeuse des pilotes graphiques, passionnée par le logiciel libre (courriel). Je travaille sur Asahi Linux. Mon CV est disponible. Des articles sont disponibles ici et via un flux RSS.
Aujourd’hui, Khronos Group a sorti la spécification 1.4 de l’API graphique standard Vulkan. Le projet Asahi Linux est fier d’annoncer le premier pilote Vulkan 1.4 pour le matériel d’Apple. En effet, notre pilote graphique Honeykrisp est reconnu par Khronos comme conforme à cette nouvelle version dès aujourd’hui…
Gaming on Linux on M1 is here! We’re thrilled to release our Asahi game playing toolkit, which integrates our Vulkan 1.3 drivers with x86 emulation and Windows compatibility. Plus a bonus: conformant OpenCL 3.0…
Vulkan 1.3 on the M1 in 1 month
Finally, conformant Vulkan for the M1! The new “Honeykrisp” driver is the first conformant Vulkan® for Apple hardware on any operating system, implementing the full 1.3 spec without “portability” waivers…
Conformant OpenGL 4.6 on the M1
For years, the M1 has only supported OpenGL 4.1. That changes today – with our release of full OpenGL® 4.6 and OpenGL® ES 3.2! Install Fedora for the latest M1/M2-series drivers…
The first conformant M1 GPU driver
Conformant OpenGL® ES 3.1 drivers are now available for M1- and M2-family GPUs. That means the drivers are compatible with any OpenGL ES 3.1 application. Interested? Just install Linux!
Upgrade your Asahi Linux systems, because your graphics drivers are getting a big boost: leapfrogging from OpenGL 2.1 over OpenGL 3.0 up to OpenGL 3.1! Similarly, the OpenGL ES 2.0 support is bumping up to OpenGL ES 3.0. That means more playable games and more functioning applications…
Today is my last day at Collabora and my last day leading the Panfrost driver.
It’s been a wild ride…
Apple GPU drivers now in Asahi Linux
We’re excited to announce our first Apple GPU driver release!
We’ve been working hard over the past two years to bring this new driver to everyone, and we’re really proud to finally be here. This is still an alpha driver, but it’s already good enough to run a smooth desktop experience and some games…
After a year in development, the open source “Asahi” driver for the Apple GPU is running real games. There’s more to do, but Neverball is already playable (and a lot of fun!)…
The Apple GPU and the Impossible Bug
In late 2020, Apple debuted the M1 with Apple’s GPU architecture, AGX, rumoured to be derived from Imagination’s PowerVR series. Since then, we’ve been reverse-engineering AGX and building open source graphics drivers. Last January, I rendered a triangle with my own code, but there has since been a heinous bug lurking…
Dissecting the Apple M1 GPU, part IV
After beginning a compiler for the Apple M1 GPU, the next step is to develop a graphics driver exercising the compiler. Since the last post two weeks ago, I’ve begun a Gallium driver for the M1, implementing much of the OpenGL 2.1 and ES 2.0 specifications. With the compiler and driver together, we’re now able to run OpenGL workloads like glxgears and scenes from glmark2 on the M1 with an open source stack. We are passing about 75% of the OpenGL ES 2.0 tests in the drawElements Quality Program used to establish Khronos conformance. To top it off, the compiler and driver are now upstreamed in Mesa…
Dissecting the Apple M1 GPU, part III
After a few weeks of investigating the Apple M1 GPU in January, I was able to draw a triangle with my own open source code. Although I began dissecting the instruction set, the shaders there were specified as machine code. A real graphics driver needs a compiler from high-level shading languages (GLSL or Metal) to a native binary. Our understanding of the M1 GPU’s instruction set has advanced over the past few months. Last week, I began writing a free and open source shader compiler targeting the Apple GPU. Progress has been rapid: at the end of its first week, it can compile both basic vertex and fragment shaders, sufficient to render 3D scenes. The spinning cube pictured above has its shaders written in idiomatic GLSL, compiled with the nascent free software compiler, and rendered with native code like the first triangle in January. No proprietary blobs here…
Dissecting the Apple M1 GPU, part II
Less than a month ago, I began investigating the Apple M1 GPU in hopes of developing a free and open-source driver. This week, I’ve reached a second milestone: drawing a triangle with my own open-source code. The vertex and fragment shaders are handwritten in machine code, and I interface with the hardware via the IOKit kernel driver in an identical fashion to the system’s Metal userspace driver…
Dissecting the Apple M1 GPU, part I
Apple’s latest line of Macs includes their in-house “M1” system-on-chip, featuring a custom GPU. This poses a problem for those of us in the Asahi Linux project who wish to run Linux on our devices, as this custom Apple GPU has neither public documentation nor open source drivers. Some speculate it might descend from PowerVR GPUs, as used in older iPhones, while others believe the GPU to be completely custom. But rumours and speculations are no fun when we can peek under the hood ourselves…
Fun and Games with Exposure Notifications
Exposure Notifications is a protocol developed by Apple and Google for facilitating COVID-19 contact tracing on mobile phones by exchanging codes with nearby phones over Bluetooth, implemented within the Android and iOS operating systems, now available here in Toronto…
Kodi and SuperTuxKart on Panfrost
Back in October, Panfrost ran some simple benchmarks, like glmark. Five months later, Panfrost has grown from running benchmarks to real-world apps, like Kodi, and 3D games like SuperTuxKart and Neverball…
Monochromatic Portraits with GLSL
In my Computer Graphics Art class, we were assigned a monochromatic portrait project. Given a photograph of a subject, we were to split the image into a small number of discrete sections of varying brightnesses, all of the same colour. Typically, this process would be completed by hand in a tool like Krita or Photoshop…
In the past month-and-a-half since the previous update on the free (open source) Panfrost driver for Mali GPUs, progress has been fervent! During the interim, Lyude Paul and I presented about the driver at the X.Org Developer’s Conference. Check out the talk (slides). Benchmarks included…
Panfrost on the RK3399 (Meow!)
In January 2018, I began using my C201 full-time. In June 2018, its charging port broke, apparently due to physical damage, and I was forced to discontinue my school laptop and Mali T760 development machine…
The libre Midgard driver, Panfrost has reached a number of new milestones, culminating in the above screenshot, demonstrating…
In the last Panfrost status update, a transitory “half-way” driver was presented, with the purpose of easing the transition from a standalone library abstracting the hardware to a full-fledged OpenGL ES driver using the Mesa and Gallium3D infrastructure…
In the last update of the free software Panfrost driver, I unveiled the Midgard shader compiler. In the two weeks since then, I’ve shifted my attention from shaders back to the command stream, the fixed-function part of the pipeline. A shader compiler is only useful if there’s a way to run the shaders, after all…
Midgard Shaders with the Free NIR Compiler
In my last update on the Panfrost project, I showed an assembler and disassembler pair for Midgard, the shader architecture for Mali Txxx GPUs. Unfortunately, Midgard assembly is an arcane, unwieldly language, understood by Connor Abbott, myself, and that’s about it besides engineers bound by nondisclosure agreements. You can read the low-level details of the ISA if you’re interested…
The Word of the Week Is…. Shaders!
About two weeks ago, I published a screenshot of a smoothed triangle rendered with a free software driver on a Mali T760 with binary shaders…
Hilariously Fast Volume Computation with the Divergence Theorem
(No, there won’t be jokes.)
The following presents a fast algorithm for volume computation of a simple, closed, triangulated 3D mesh. This assumption is a consequence of the divergence theorem. Further extensions may generalise to other meshes as well, although that is presently out of scope…
Static code recompilation is a fascinating problem, and largely an unsolved one, because in general it’s impossible – that’s about as hard as you can get! Nevertheless, it’s possible in many cases, if you ignore certain features like self-modifying code…