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feat(rendering): add Light.* — deterministic 2D light accumulation with hard shadows (#4)
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A software light pass over the framebuffer, run in a render phase after drawing
the scene: Light.ambient multiplies the scene toward a tint (night/cave mood),
Light.point additively accumulates a radial glow with linear falloff clamped per
channel, and Light.occlude / Light.clear_occluders cast hard shadows by blocking
a light's rays against rectangular occluders. Integer + Q16.16 fixed throughout,
so a scene lights identically every run and in a headless render (diffable).

Engine in runtime/native/light.ludic, spliced on demand (g_uses_light) like the
regex/query runtimes; namespace wired in emit_call.ludic. Ships issue #4 tiers 1
(ambient + additive radial lights) and 2 (hard shadows). Normal-mapped sprites,
soft shadows, a day/night directional light, and auto-consuming Light2D/Occluder
components are follow-ups (the auto-system hook is tracked by #43).

- runtime/native/light.ludic: the light-accumulation engine (isqrt falloff,
  segment/occluder shadow test, ambient modulate)
- examples/library/lighting.ludic: 14 pixel-readback assertions
- docs/language/light/: Light.ambient/point/occlude/clear_occluders
- tools/x/test.ludic: lighting.ludic in the regression suite

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Orkun ÇAKILKAYA 2026-08-31 14:07:19 +03:00
parent 31cfbc2465
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bump: minor
type: feat
2D lighting — the `Light.*` namespace: a deterministic software light-accumulation pass over the framebuffer. `Light.ambient` modulates the scene toward a tint (night/cave mood), `Light.point` adds a radial glow with linear falloff clamped per channel, and `Light.occlude`/`Light.clear_occluders` cast hard shadows by blocking a light's rays against rectangular occluders. Integer + Q16.16 fixed, so a scene lights identically every run and in a headless render.