Building a GPU backend for Emacs: A technical deep dive into hardware-accelerated text rendering
Summary
The author documents their personal journey of building a GPU-accelerated rendering backend for Emacs, driven by curiosity about why the editor relies on CPU-based text drawing despite modern laptops having capable GPUs. They explore Emacs's redisplay engine (xdisp.c), discover its CPU-bound architecture from an era before GPUs, and detail their technical approach to offloading rendering to the GPU for smoother performance, video playback in buffers, and animated effects.
Source
bskyBuilding a GPU backend for Emacs: A technical deep dive into hardware-accelerated text renderingen.andros.devKey quotes
· 3 pulledA few months ago I became obsessed with a silly question: why does my Emacs, on a laptop with a perfectly capable GPU, draw all of its text using the CPU?
I discovered that every glyph, every underline, every scroll is recomputed and repainted by the processor.
Emacs's redisplay engine (xdisp.c) was born in an era when there was no other
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