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c2036f5dc1
The 3D-highway Butterchurn background set only the output canvas CSS size and called setRendererSize(), but never sized the canvas DRAWING BUFFER (canvas.width/height). Butterchurn does not size the output canvas itself (renderToScreen viewports to the reported size into the default framebuffer), so the buffer stayed at the browser default 300x150 while the viewport was the full highway. Only the bottom-left ~300x150 of the pattern was drawn, then CSS-stretched across the whole highway -- zoomed, soft, and aspect-wrong, worse the larger the panel. Add _bcApplySize(cssW, cssH): set the drawing buffer to the device-pixel render size (round(css * min(DPR, 1.5))), confine every layer (canvas, backdrop, scrim, tint) to the highway rect, and report the same device px to setRendererSize so buffer == on-screen viewport. Seed the buffer at create and switch createVisualizer to pixelRatio:1, textureRatio:1 (DPR is now folded into the reported size, so buffer == viewport == internal texsize, no double-counting). render() and resize() both route through it. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Signed-off-by: ChrisBeWithYou <christian.a.cowan@gmail.com>