From ef389028b96d194320894ffd072e00adf2d3ff54 Mon Sep 17 00:00:00 2001
From: Nicholas Bishop <nicholasbishop@gmail.com>
Date: Fri, 1 Dec 2006 18:41:25 +0000
Subject: [PATCH] Added a copy function for multires; duplicating a mesh with
 multires now works properly.

---
 source/blender/blenkernel/intern/mesh.c |  3 ++
 source/blender/include/multires.h       |  2 ++
 source/blender/src/multires.c           | 41 +++++++++++++++++++++++++
 3 files changed, 46 insertions(+)

diff --git a/source/blender/blenkernel/intern/mesh.c b/source/blender/blenkernel/intern/mesh.c
index 0f1a571b4f3..21003785148 100644
--- a/source/blender/blenkernel/intern/mesh.c
+++ b/source/blender/blenkernel/intern/mesh.c
@@ -269,6 +269,9 @@ Mesh *copy_mesh(Mesh *me)
 			if(tface->tpage)
 				id_lib_extern((ID*)tface->tpage);
 	}
+	
+	if(me->mr)
+		men->mr= multires_copy(me->mr);
 
 	men->mselect= NULL;
 
diff --git a/source/blender/include/multires.h b/source/blender/include/multires.h
index af5260e14e1..82a4629408d 100644
--- a/source/blender/include/multires.h
+++ b/source/blender/include/multires.h
@@ -34,12 +34,14 @@ struct uiBlock;
 struct Object;
 struct Mesh;
 struct MultiresLevel;
+struct Multires;
 
 void multires_draw_interface(struct uiBlock *block, unsigned short cx, unsigned short cy);
 void multires_disp_map(void *, void*);
 
 void multires_make(void *ob, void *me);
 void multires_delete(void *ob, void *me);
+struct Multires *multires_copy(struct Multires *orig);
 void multires_free(Mesh *me);
 void multires_free_level(MultiresLevel *lvl);
 void multires_del_lower(void *ob, void *me);
diff --git a/source/blender/src/multires.c b/source/blender/src/multires.c
index 83b6a8d5cf0..447b1b685ff 100644
--- a/source/blender/src/multires.c
+++ b/source/blender/src/multires.c
@@ -579,6 +579,47 @@ void multires_delete(void *ob, void *me_v)
 	BIF_undo_push("Delete multires");
 }
 
+MultiresLevel *multires_level_copy(MultiresLevel *orig)
+{
+	if(orig) {
+		MultiresLevel *lvl= MEM_dupallocN(orig);
+		
+		lvl->verts= MEM_dupallocN(orig->verts);
+		lvl->faces= MEM_dupallocN(orig->faces);
+		lvl->texcolfaces= MEM_dupallocN(orig->texcolfaces);
+		lvl->edges= MEM_dupallocN(orig->edges);
+		lvl->vert_edge_map= lvl->vert_face_map= NULL;
+		multires_calc_level_maps(lvl);
+		
+		return lvl;
+	}
+	return NULL;
+}
+
+Multires *multires_copy(Multires *orig)
+{
+	if(orig) {
+		Multires *mr= MEM_dupallocN(orig);
+		MultiresLevel *lvlorig;
+		
+		mr->levels.first= mr->levels.last= NULL;
+		
+		for(lvlorig= orig->levels.first; lvlorig; lvlorig= lvlorig->next)
+			BLI_addtail(&mr->levels, multires_level_copy(lvlorig));
+			
+		if(mr->dverts && mr->levels.first) {
+			MultiresLevel *lvl= mr->levels.first;
+			mr->dverts= MEM_mallocN(sizeof(MDeformVert)*lvl->totvert, "MDeformVert");
+			copy_dverts(mr->dverts, orig->dverts, lvl->totvert);
+		}
+		else
+			mr->dverts= NULL;
+		
+		return mr;
+	}
+	return NULL;
+}
+
 void multires_free(Mesh *me)
 {
 	if(me->mr) {