After last year's return to low-end hardware, there was no choice but to go to the other extreme this year: 4Kp60 effects on an Nvidia Jetson AGX Orin. Some new shaders were added, and some from 2023 and 2024 were retweaked for maximum visual efficacy. Everything is sort-of perfectly synced to music by Amiga and C64 legend Chris Huelsbeck. Full source code for Windows and Linux as usual.
As we always say, the Xmas Demo concept is about reproducing computationally intensive graphical effects on cheap low-end hardware. This year we decided to follow it for a change. A matchbox sized NVidia Jetson Nano that costs just $99 was coerced into making a stunning result in 1080p60. Full source code included. Arcane optimizations were needed; they're all tersely commented.
The Xmas Demo 2023 for the NVidia Jetson AGX Orin Developer Kit. How would the TX2-based 2017 and 2020 Xmas Demos look on 8 times more powerful hardware? We retweaked all the old shaders, replaced some crap ones, and tied it all together in a 4 minutes long hiqh quality video. Full source code included.
Presenting Edgehog: A method for doing fractal rectangle checking quickly on multiple ARM Neon cores. The output is rendered by a GPU using the Depth First Algorithm (DFA) described in the article "GPU Hacks" (Corneliusen 2016, 2017). This makes it possible to render 1080p60 depth 256 fractals on a dainty NVidia Jetson Nano. Full source code included. Also available as PDF.
Introducing a fast Lanczos-2 image scaler for ARM Neon written in C and intrinsics. It uses a unique method for applying separable filters described in the article "Exploiting the Cache: Faster Separable Filters" (Corneliusen 2018). An ARMv7 Neon Assembler implementation from 2014 gets a makeover. Full source code included. Also available as PDF.
It's been two years since the launch of the discordant book Real Programming. This article sums up all the main themes and looks at what has happened since then. Also available as PDF.
