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Aiden
2026-05-08 16:42:23 +10:00
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SHADER_CONTRACT.md
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@@ -163,7 +163,7 @@ Fields:
- `uv`: normalized texture coordinates, usually `0..1`.
- `sourceColor`: decoded RGBA source video at `uv`.
- `inputResolution`: decoded input video resolution in pixels.
- `outputResolution`: shader render resolution in pixels. The current pipeline renders the shader stack at input resolution, then scales the final frame to the configured DeckLink output mode.
- `outputResolution`: shader render resolution in pixels. The current pipeline renders the shader stack at input resolution, then scales the final frame to the configured video I/O output mode.
- `time`: elapsed runtime time in seconds.
- `utcTimeSeconds`: current UTC time of day from the host PC clock, expressed as seconds since UTC midnight.
- `utcOffsetSeconds`: host PC local UTC offset in seconds. Add this to `utcTimeSeconds` and wrap to `0..86400` to get local time of day.
@@ -177,8 +177,8 @@ Fields:
Color/precision notes:
- `context.sourceColor`, `sampleVideo()`, and temporal history samples are display-referred Rec.709-like RGB, not linear-light RGB.
- The host prefers 10-bit DeckLink YUV capture and output when the card/mode supports it, with automatic 8-bit fallback.
- Internal decoded, layer, composite, output, and temporal render targets are 16-bit floating point, so gradients and LUT work have more headroom than the packed DeckLink byte formats.
- The current DeckLink backend prefers 10-bit YUV capture and output when the card/mode supports it, with automatic 8-bit fallback.
- Internal decoded, layer, composite, output, and temporal render targets are 16-bit floating point, so gradients and LUT work have more headroom than packed byte video I/O formats.
- Do not add extra Rec.709 or linear conversions unless the shader intentionally documents that behavior.
## Helper Functions