Class ShadowProgram

The depth-only caster pipeline (§69).

const program = ShadowProgram.create(gl);
program.use();
program.setViewProjection(lights.shadowMatrix);  // once per shadow pass
program.setModel(item.worldMatrix);              // once per caster
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Owns its GL objects and nothing else. Since 2026-09-11 it compiles lazily, on the first frame whose light asks for a shadow map, and only once registerShadowPipeline has been called — the renderer drops it on context loss and re-acquires it on the next shadowed frame (§61), exactly as it handles the skinned pair.