From a2f357edc2afb8f3ded60bc0e48c4015d6ad8f40 Mon Sep 17 00:00:00 2001
From: Lukas Stockner <lukas.stockner@freenet.de>
Date: Wed, 31 Jul 2019 12:04:52 -0700
Subject: Add operator for removing unused material slots

Reviewers: campbellbarton, brecht

Reviewed By: brecht

Subscribers: brecht

Differential Revision: https://developer.blender.org/D4991
---
 source/blender/blenkernel/intern/mesh.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'source/blender/blenkernel/intern/mesh.c')

diff --git a/source/blender/blenkernel/intern/mesh.c b/source/blender/blenkernel/intern/mesh.c
index f38161546e2..7e755e54eaa 100644
--- a/source/blender/blenkernel/intern/mesh.c
+++ b/source/blender/blenkernel/intern/mesh.c
@@ -1206,6 +1206,27 @@ void BKE_mesh_material_index_remove(Mesh *me, short index)
   }
 }
 
+bool BKE_mesh_material_index_used(Mesh *me, short index)
+{
+  MPoly *mp;
+  MFace *mf;
+  int i;
+
+  for (mp = me->mpoly, i = 0; i < me->totpoly; i++, mp++) {
+    if (mp->mat_nr == index) {
+      return true;
+    }
+  }
+
+  for (mf = me->mface, i = 0; i < me->totface; i++, mf++) {
+    if (mf->mat_nr == index) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
 void BKE_mesh_material_index_clear(Mesh *me)
 {
   MPoly *mp;
-- 
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