mirror of
https://github.com/NousResearch/hermes-agent.git
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92 lines
3.5 KiB
TypeScript
92 lines
3.5 KiB
TypeScript
import { useGpuTier } from "@nous-research/ui/hooks/use-gpu-tier";
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/**
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* Replicates the visual layer stack of `<Overlays dark />` from
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* `@nous-research/ui` without pulling in its leva / gsap / three peer deps.
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*
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* See `design-language/src/ui/components/overlays/index.tsx` for the source of
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* truth. Defaults match LENS_0 (the Hermes teal dark preset); the deep canvas
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* and the warm vignette both read theme-switchable CSS custom properties so
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* `ThemeProvider` can repaint the stack without remounting.
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*
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* z-1 bg = `var(--background-base)`, mix-blend-mode: difference
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* z-2 filler-bg jpeg, inverted, opacity 0.033, difference
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* z-99 warm top-left vignette (`var(--warm-glow)`), opacity 0.22, lighten
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* z-101 noise grain (SVG, ~55% opacity × `--noise-opacity-mul`,
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* color-dodge) — gated on GPU tier
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*
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* `useGpuTier` returns 0 when WebGL is unavailable, the renderer is a
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* software rasterizer (SwiftShader/llvmpipe), or the user has
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* `prefers-reduced-motion: reduce` set. We skip the animated noise layer
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* in that case so low-power / accessibility-conscious sessions stay crisp,
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* mirroring the DS `<Noise />` component's own opt-out.
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*/
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export function Backdrop() {
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const gpuTier = useGpuTier();
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return (
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<>
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<div
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aria-hidden
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className="pointer-events-none fixed inset-0 z-[1]"
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style={{
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backgroundColor: "var(--background-base)",
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mixBlendMode: "difference",
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}}
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/>
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<div
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aria-hidden
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className="pointer-events-none fixed inset-0 z-[2]"
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style={
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{
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// Themes can override the filler background by setting
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// `assets.bg` — the <img> hides itself when a CSS bg is set
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// so the two don't double-darken. CSS var fallbacks keep the
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// default behaviour unchanged when no theme customises these.
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mixBlendMode:
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"var(--component-backdrop-filler-blend-mode, difference)",
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opacity: "var(--component-backdrop-filler-opacity, 0.033)",
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backgroundImage: "var(--theme-asset-bg)",
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backgroundSize: "var(--component-backdrop-background-size, cover)",
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backgroundPosition:
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"var(--component-backdrop-background-position, center)",
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} as unknown as React.CSSProperties
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}
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>
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<img
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alt=""
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className="h-[150dvh] w-auto min-w-[100dvw] object-cover object-top-left invert theme-default-filler"
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fetchPriority="low"
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src="/ds-assets/filler-bg0.jpg"
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/>
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</div>
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<div
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aria-hidden
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className="pointer-events-none fixed inset-0 z-[99]"
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style={{
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background:
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"radial-gradient(ellipse at 0% 0%, transparent 60%, var(--warm-glow) 100%)",
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mixBlendMode: "lighten",
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opacity: 0.22,
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}}
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/>
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{gpuTier > 0 && (
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<div
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aria-hidden
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className="pointer-events-none fixed inset-0 z-[101]"
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style={{
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backgroundImage:
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"url(\"data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' fill='%23eaeaea' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E\")",
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backgroundSize: "512px 512px",
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mixBlendMode: "color-dodge",
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opacity: "calc(0.55 * var(--noise-opacity-mul, 1))",
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}}
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/>
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)}
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</>
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);
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}
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