From ce1ac05c632a42ea98630b8525c56baf6a771508 Mon Sep 17 00:00:00 2001
From: Robert Swain <robert.swain@gmail.com>
Date: Sat, 2 Sep 2023 20:11:13 +0200
Subject: [PATCH] Explicitly make instance_index vertex output
 @interpolate(flat) (#9675)

The WGSL spec says that all scalar or vector integer vertex stage
outputs and fragment stage inputs must be marked as @interpolate(flat).
I think wgpu fixed this up for us, but being explicit is more correct.
---
 crates/bevy_pbr/src/render/mesh_vertex_output.wgsl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/bevy_pbr/src/render/mesh_vertex_output.wgsl b/crates/bevy_pbr/src/render/mesh_vertex_output.wgsl
index 32418f8043..6cf70d2d17 100644
--- a/crates/bevy_pbr/src/render/mesh_vertex_output.wgsl
+++ b/crates/bevy_pbr/src/render/mesh_vertex_output.wgsl
@@ -16,6 +16,6 @@ struct MeshVertexOutput {
     @location(4) color: vec4<f32>,
     #endif
     #ifdef VERTEX_OUTPUT_INSTANCE_INDEX
-    @location(5) instance_index: u32,
+    @location(5) @interpolate(flat) instance_index: u32,
     #endif
 }