isShadowCasterGranted method
Whether lightComponent (a SpotLightComponent or
PointLightComponent) held a shadow slot last frame.
False for a light that does not cast at all, and also for one whose
castsShadow is set but which lost the slot to the budget. Editors pair
this with shadowCasterOverflowCount to point at the specific lights
whose authored shadow is not being drawn.
Implementation
bool isShadowCasterGranted(Object lightComponent) =>
_grantedShadowCasters.contains(lightComponent);