Variable GSPLAT_RUNTIME_UNIFORMS`Const`

GSPLAT_RUNTIME_UNIFORMS: readonly [
    "uResolution",
    "uPixelRatio",
    "uNearCull",
    "uProjectionMode",
    "uInvGamma",
    "uSortedIndexSlot",
    "uDensityDrop",
    "uDensityAlphaExp",
] = ...

Runtime uniforms a gsplat material clone must carry over (GLSL and TSL twins).