visgl / deck.gl / 40269125472

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fix(core): draw the shadow map without per-layer polygon offset (#10892)

Layer._drawLayer applies `getPolygonOffset` (default [0, -layerIndex * 100])
in every pass. The shadow map stores gl_FragCoord.z, which includes the
offset, so the k-th layer drawn in the shadow pass stored a depth
k * 100 * 2^-16 closer to the light. From the third layer on, layers fell
partly or fully into their own shadow. ShadowPass now sets depthBias: 0
so the shadow map is drawn without the offset.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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