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Hello, world!

My name is Tomasz Stachowiak, and I’m a professional madman. I mostly tinker with real-time graphics, and occasionally trace my path in Veach-land. By day I’m a reputable software engineer at SEED, while at night I bask in the suffering of compilers and GPUs. Here’s some of my nonsense:

Hacking GCN via OpenGL

bannerAMD’s Graphics Core Next GPU architecture has a number of interesting features which one cannot access via standard APIs. I show how to hack around the OpenGL driver, and feed it native shaders written in GCN ISA instead of GLSL. Slides here!

A deferred material rendering system

bannerPractical application of the GCN hacks: indirect dispatch of lots of unique compute shaders and native barycentric coordinate access. Those allows for efficient surface shading in a deferred manner without the use of ubershaders. Geometry and material descriptions can be decoupled, and we gain a lot of control over shading frequency. Slides here!

How not to use DLLs

bannerRuntime loading of object files, relocation of DLLs. Mostly harmful stuff. Article here.

Stochastic Screen-Space Reflections

Importance sampled screen-space reflections with a novel spatiotemporal filter. I prototyped it in a toy engine written in the Rust language, and later ported to Frostbite. It first shipped in Mirror’s Edge and Need for Speed.

Check out the slides for my Siggraph 2015 talk which was part of Advances in Real-Time Rendering in Games.

Frostbite

bannerI worked in the Frostbite Rendering team in Stockholm for three years. My focus was Image Quality, and included physically-based rendering, tiled lighting, screen-space and planar reflections, skin shading, high dynamic range stuff (grading, display mapping, vendor-specific output), physically-inspired glare, checkerboard rendering, temporal anti-aliasing, motion blur, global illumination, as well as low-level PS4 and XB1 work. I even had some fun with Mantle. My code ended up in franchises like Battlefield, Mass Effect, Battlefront, Need For Speed, FIFA, Mirror’s Edge, Plants vs Zombies, and a few others.

Alien: Isolation

bannerI joined Creative Assembly straight out of university, and had the opportunity to work on Alien: Isolation. It was quite a blast, and an amazing learning experience. I contributed to deferred lighting, physically-based rendering, end-to-end skin and hair pipelines and rendering, in-house real-time radiosity, post-processing, and a bunch of other tech.
I presented some of our deferred rendering tricks at Develop 2012.

Nucleus

bannerAn old rendering engine I wrote for my master’s thesis. It had a lot of over-engineering and naive design, but also a few neat ideas, and a custom node-based shader editor.
Read more.

Hybrid

bannerA crossbreed between immediate- and retained-mode graphical user interfaces. Both styles could be used where appropriate, and a domain-specific language helped with the creation of fancy layouts. The backend targeted the GPU directly and rendered in only a handful of draw calls. Written in the 1.0 version of the D programming language. User docs here.

Authority-based client-server netcode

An excursion into an unusual territory for me – game networking and physics synchronization. I had the ambition of making a Battlefield-like game, but that turned out to be too vast in scope… Surprise, surprise! In any case, it was a valuable and fun learning experience. I used ENet for the low-level networking, rolled an authority scheme on top of it, and synchronized a Havok physics simulation as well as gameplay logic.

Compile-time raytracing

bannerOk, this one is here just for the bragging rights. I claim to have written the world’s first compile-time raytracer. That is, the compiler runs, and there’s no executable generated. Instead, it prints garbage to stdout. Redirect it to a file, and you have an image. I did it in the D language before it even hit the 1.0 version, so it didn’t have any of the modern compile-time function evaluation. Old blurb here.