// Copyright 2020 Google LLC struct VSOutput { float4 Pos : SV_POSITION; [[vk::location(0)]] int InstanceIndex : TEXCOORD0; }; VSOutput main([[vk::location(0)]] float4 Pos : POSITION0, uint InstanceIndex : SV_InstanceID) { VSOutput output = (VSOutput)0; output.InstanceIndex = InstanceIndex; output.Pos = Pos; return output; }