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openspec/changes/enterprise-gaming-r3f-parallax/proposal.md

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+# OpenSpec Change: enterprise-gaming-r3f-parallax
+
+- **Change ID**: enterprise-gaming-r3f-parallax
+- **Package**: `@suaveplan/r3f-parallax`
+- **Category**: gaming/effects
+- **Target path**: `gaming/effects/r3f-parallax`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/r3f-parallax.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/r3f-parallax` on the genesis branch from scratch at enterprise quality. The package provides interior parallax components for React Three Fiber: `WindowParallax` (shared ray-marched room behind an array of portal quads using a single depth-layered texture atlas) and `GridParallax` (tiled M×N grid of parallax rooms on one plane). Both components are GPU-friendly, declarative R3F JSX. Configurable: lighting within rooms, depth layers, room-layout generation, and texture-atlas helpers. Storybook-driven with interactive controls for room parameters. Genesis adds structured errors, and 100% coverage.
+
+---
+
+## Available workspace deps
+
+`@suaveplan/error`, react, `@react-three/fiber`, `@react-three/drei`, three.
+
+---
+
+## Public API surface
+
+```ts
+function WindowParallax(props: WindowParallaxProps): JSX.Element
+// columns, rows, roomDepth, atlasTexture, lightColor, lightIntensity
+
+function GridParallax(props: GridParallaxProps): JSX.Element
+// tileSize, roomDepthLayers, atlas
+
+function generateRoomAtlas(rooms: RoomDefinition[], options: AtlasOptions): AtlasResult
+```
+
+---
+
+## File layout
+
+```text
+gaming/effects/r3f-parallax/
+  package.json / tsconfig.json / vitest.config.ts
+  src/
+    index.ts
+    types/common.ts + md
+    shaders/parallax.vert.ts + parallax.frag.ts
+    utils/room-atlas-generator.ts + md + test
+    components/
+      WindowParallax/ (tsx + md + test + stories + index)
+      GridParallax/ (tsx + md + test + stories + index)
+  tests/integration.test.ts
+```