Petros @pbantolas

I left Apple to build. Custom rendering engines for mobile · iOS apps · Metal & C++ · London bantolas.dev UK Joined September 2017

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Petros @pbantolas

a month ago

@Andy_AJT Nice, might have to join this one too. Last Friday at Grind was fun!

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Petros @pbantolas

4 months ago

@adamlyttleapps apps.apple.com/us/app/latte-a… 🙏🏻

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I recently had a few discussions where mobile GPU architecture (TBDR) came up, so here are some notes. the gist is: TBDR saves bandwidth by breaking a frame into small tiles, processing each tile mostly independently and on-chip, then writing the final pixels out once.

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Petros @pbantolas

6 months ago

@cooperx86 @Shpigford Can you recommend a few others to try? Either free or low cost ones

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Petros @pbantolas

7 months ago

check out at tfl-soundscape.vercel.app

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Petros @pbantolas

7 months ago

a data visualisation experiment i spun up today: hear arrivals in the tfl network as generative sounds lots to learn when it comes to creating cohesive melodies out of randomness, but very fun to build!

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Jaytel @Jaytel

7 months ago

only beautiful Tiny Ui happening in the Codex app

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Petros @pbantolas

8 months ago

i asked gemini to hide my cables. 3 prompts later

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Petros @pbantolas

8 months ago

@aavaa44 wow 🤩

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Petros @pbantolas

8 months ago

Fully agentic shader editing on @XorDev 's fragcoord.xyz Claude Code reads, edits, verifies errors, and screenshots the canvas on its own. Wired it up as a skill + CLI this morning. Pretty fun!

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Petros @pbantolas

8 months ago

@XorDev i would urge you to have a workflow that allows agents to read-edit-see the output. would be very useful for iteration and building with llms i tried something today with agent-browser and claude, it works, but is a bit of a workaround happy to chat about it

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Petros @pbantolas

8 months ago

@PaulSolt @XorDev i tried, turns out ocean sims are non trivial

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Petros @pbantolas

8 months ago

was vaguely curious to recreate the water style from Paul's concept art in a shader, but first I thought "why not throw this to a model first". well. left: sonnet 4.6, right: gemini 3.1 pro (one shot)

Paul Solt @PaulSolt

8 months ago

Shoot 'em up concept art for Red Interceptor. Image Gen 1.5 in ChatGPT. Looks really cool! How would I have to layer the water to get it to tile? 🤔 Depth gradient with a wave overlay is my first thought. Composite via alpha blending.

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Petros @pbantolas

8 months ago

links to fragcoord (go follow @XorDev ) gemini: fragcoord.xyz/s/rg94hra1 sonnet: fragcoord.xyz/s/ri4offac opus: fragcoord.xyz/s/rs7i988f

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Petros @pbantolas

8 months ago

and here's opus 4.6 for fun all models can identify the techniques needed for the effect: noise, fbm, bump maps, separate colors for each element (e.g. white-ish color for waves) but putting those together is where most fail and google has the edge

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Petros @pbantolas

8 months ago

@PaulSolt hmmm map your depth to a color ramp (controllable colours) use a custom shader for water tiles that samples the depth map + ramp, tints the base tile (grayscale/mask?)

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Petros @pbantolas

8 months ago

with that i could see exactly how much i could sell without going over the CGT threshold this tax year put a limit order today, just before the deadline honestly the whole thing took an afternoon. the years of avoiding it were entirely about not wanting to parse pdfs manually

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Petros @pbantolas

8 months ago

at the end of this i had a clean list of every buy/sell event in GBP in chronological order, ready to run through cgtcalc first time i'd actually seen my full position clearly

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Petros @pbantolas

8 months ago

i finally sat down and did my UK capital gains tax calculations this week ex-employer shares on a US broker, pdfs, spreadsheets, terminology i half understood. every time i opened them i'd just close the tab so i just described the whole mess to an agent