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hajimehoshi

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• 2 skills
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• 1 day ago last updated

1. ▌
   Writing Kage Shaders · hajimehoshi bundle

   Use this skill when writing, reviewing, debugging, or porting a Kage shader for Ebitengine — anything involving `//kage:unit pixels`, `ebiten.NewShader`, `DrawTrianglesShader`, `DrawRectShader`, or a `Fragment(dstPos vec4, src0Pos vec2, color vec4) vec4` entry point. Use it especially when translating an existing shader from GLSL, Shadertoy, HLSL, MSL, Godot, or Unity, where the source assumes 0..1 texture coordinates, `gl_FragCoord`, `texture()` sampling, a bottom-left origin, `uniform` declarations, a ternary operator, or straight (non-premultiplied) alpha — every one of which is wrong in Kage. Covers the atlas-relative coordinate model, sampling several source images of different sizes, premultiplied alpha, the Go subset Kage actually accepts, and how to compile-check a shader without a GPU.
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2. ▌
   Run Ebitengine App Headless · hajimehoshi bundle

   Use this skill to run an Ebitengine app (anything implementing ebiten.Game) headlessly and programmatically — no visible window and no changes to the app's source — to test, debug, screenshot, or otherwise exercise it. It launches the app as a vmhost guest, drives it through its ticks faster than real time, injects keyboard / mouse / touch / gamepad / text input, reads the rendered frame back as pixels to assert on or dump as a PNG, and observes the audio the app plays. Use when you need input injection, deterministic multi-tick runs, golden-image checks, or audio assertions — for example to reproduce an input-dependent bug, verify behavior after a sequence of clicks or key presses, check that the right sound plays, capture a single rendered frame, or let an AI agent drive an app end-to-end.
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