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Evan
c7fdc4ec2d
## What
Routes every renderer call site that read `window.devicePixelRatio`
through a single `renderDpr()` helper that caps the value at **2**.
```ts
export function renderDpr(): number {
return Math.min(window.devicePixelRatio || 2, 2);
}
```
## Why
On very high-DPI displays (DPR 3, common on phones) the WebGL backing
store was sized at 3× CSS pixels — ~9× the fragment work of 1× — for a
marginal visual gain over 2×. Capping at 2 keeps retina (DPR 2)
pixel-perfect while clamping the 3× case.
## How it stays correct
DPR isn't just the canvas size — it's one coordinate system shared by:
- the canvas backing-store size (`Renderer.resize`)
- the camera's screen↔world math (`Camera.resize` / `screenToWorld` /
`worldToScreen`)
- the camera zoom scale (`ClientGameRunner.syncCamera`)
- the constant-CSS-pixel-size world text (`WorldTextPass`)
These must all use the same DPR value or pointer hit-testing and text
sizing drift. Routing them through one helper guarantees that. The
diagnostics reporter (`Diagnostic.ts`) is intentionally left reading the
real hardware DPR, since its job is to report the actual device.
## Test
- `tsc --noEmit` clean for all touched files (one pre-existing unrelated
`marked` types error remains on `main`).
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>