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## Summary Extract `DEFAULT_DURATION = 0.7` and `DEFAULT_EASE = "power2.inOut"` as shared constants in `hyper-shader.ts` and apply them at all three fallback sites (metadata write, browser/render mode, engine mode). ## Why `Chunk 2` of `plans/hdr-followups.md`. The three fallback sites had drifted apart: the metadata path used `1s` / `"none"` while the actual rendering used `0.7s` / `"power2.inOut"`. A transition that omitted `duration`/`ease` would render at 0.7 s but tell the producer it was 1 s, throwing off the producer's compositing window planning and producing a visible ~0.3 s brightness dropout. This is a small, high-value correctness fix that runs before the larger Chunk 1 / Chunk 4 work. ## What changed - New module-level `DEFAULT_DURATION` and `DEFAULT_EASE` constants in `packages/shader-transitions/src/hyper-shader.ts`. - All three fallback call sites (metadata, browser, engine) now use the constants. - Explicit `ease: "none"` on the timeline-length anchor tweens elsewhere in the file is intentional (those are linear interpolators driving the shader's progress uniform) and is left unchanged. ## Test plan - [x] Render a composition with a transition that omits `duration` and `ease` — no brightness dip in the last ~0.3 s of the transition. - [x] Preview (browser mode) and render (engine mode) produce matching blending curves. - [x] Render with explicit `duration: 1.5` still works (constants are fallbacks only). ## Stack Chunk 2 of `plans/hdr-followups.md`. Lands ahead of Chunk 1 (opacity) per the suggested merge order.
@hyperframes/shader-transitions
WebGL shader transitions for HyperFrames compositions. Renders GPU-accelerated scene-to-scene transitions using fragment shaders, driven by GSAP timelines.
Install
npm install @hyperframes/shader-transitions
Or load directly via CDN:
<script src="https://cdn.jsdelivr.net/npm/@hyperframes/shader-transitions/dist/index.global.js"></script>
Usage
import { init } from "@hyperframes/shader-transitions";
const tl = init({
bgColor: "#0a0a0a",
accentColor: "#ff6b2b",
scenes: ["scene-1", "scene-2", "scene-3"],
transitions: [
{ time: 3, shader: "domain-warp", duration: 0.8 },
{ time: 8, shader: "light-leak", duration: 0.7 },
],
});
The init() function captures each scene to a WebGL texture at transition time, crossfades between them using the selected shader, and returns a GSAP timeline. If WebGL is unavailable, it falls back to hard cuts.
With an existing timeline
Pass your own GSAP timeline to layer transitions onto it:
const tl = gsap.timeline({ paused: true });
// ... add your scene animations ...
init({
bgColor: "#000",
scenes: ["intro", "demo", "outro"],
transitions: [
{ time: 5, shader: "cinematic-zoom" },
{ time: 12, shader: "glitch", duration: 0.5 },
],
timeline: tl,
});
Available shaders
| Shader | Description |
|---|---|
domain-warp |
Organic noise-based warp with glowing edge |
ridged-burn |
Ridged noise burn with sparks and heat glow |
whip-pan |
Horizontal motion blur simulating a fast camera pan |
sdf-iris |
Circular iris wipe with glowing ring edge |
ripple-waves |
Concentric ripple distortion radiating from center |
gravitational-lens |
Warping gravity well with chromatic aberration |
cinematic-zoom |
Radial zoom blur with chromatic fringing |
chromatic-split |
RGB channel separation expanding from center |
glitch |
Digital glitch with block displacement and scanlines |
swirl-vortex |
Spiral rotation with noise-based warping |
thermal-distortion |
Heat shimmer rising from the bottom |
flash-through-white |
Flash to white then reveal the next scene |
cross-warp-morph |
Noise-driven morph blending both scenes |
light-leak |
Warm cinematic light leak with lens flare |
API
init(config): GsapTimeline
| Option | Type | Required | Description |
|---|---|---|---|
bgColor |
string |
yes | Fallback background color (hex) for scene capture. Use the composition's body/canvas background — individual scenes set their own background-color via CSS. |
accentColor |
string |
no | Accent color (hex) for shader glow effects |
scenes |
string[] |
yes | Element IDs of each scene, in order |
transitions |
TransitionConfig[] |
yes | Transition definitions (see below) |
timeline |
GsapTimeline |
no | Existing timeline to attach transitions to |
compositionId |
string |
no | Override the data-composition-id for timeline registration |
TransitionConfig
| Option | Type | Default | Description |
|---|---|---|---|
time |
number |
— | Start time in seconds |
shader |
ShaderName |
— | Shader name from the table above |
duration |
number |
0.7 |
Transition duration in seconds |
ease |
string |
"power2.inOut" |
GSAP easing function |
SHADER_NAMES
Array of all available shader name strings, useful for validation or building UIs.
import { SHADER_NAMES } from "@hyperframes/shader-transitions";
// ["domain-warp", "ridged-burn", "whip-pan", ...]
Distribution
| Format | File | Use case |
|---|---|---|
| ESM | dist/index.js |
Bundlers (Vite, webpack, etc.) |
| CJS | dist/index.cjs |
Node.js / require() |
| IIFE | dist/index.global.js |
<script> tag, CDN (global: HyperShader) |
All formats include source maps. TypeScript definitions included.
Related packages
@hyperframes/core-- types, parsers, runtime@hyperframes/engine-- rendering enginehyperframes-- CLI
License
MIT