Struct LineInstanceData

float4 color

float3 end

uint joinHintInstanceIndex

float padding

Dummy padding field to work around a Metal compilation bug.

The joinHintInstanceIndex must be in its own aligned 16-byte slot because otherwise Unity might compile it to first be loaded as part of a float4 (losing precision) and then be converted to an uint. See https://fogbugz.unity3d.com/default.asp?1427850_6sqsaf8ges91mhf1

float3 start

float width