[Bf-blender-cvs] [b305041] master: Add DM_get_looptri_array utility function

[Campbell Barton]

Commit: b305041ce6779f90a282283ff04bd36f1807c728
Author: Campbell Barton
Date:   Wed Jul 22 20:54:12 2015 +1000
Branches: master
https://developer.blender.org/rBb305041ce6779f90a282283ff04bd36f1807c728

Add DM_get_looptri_array utility function

===================================================================

M	source/blender/blenkernel/BKE_DerivedMesh.h
M	source/blender/blenkernel/intern/DerivedMesh.c

===================================================================

diff --git a/source/blender/blenkernel/BKE_DerivedMesh.h b/source/blender/blenkernel/BKE_DerivedMesh.h
index 2c74815..369bd51 100644
--- a/source/blender/blenkernel/BKE_DerivedMesh.h
+++ b/source/blender/blenkernel/BKE_DerivedMesh.h
@@ -800,5 +800,11 @@ struct MEdge *DM_get_edge_array(struct DerivedMesh *dm, bool *allocated);
 struct MLoop *DM_get_loop_array(struct DerivedMesh *dm, bool *allocated);
 struct MPoly *DM_get_poly_array(struct DerivedMesh *dm, bool *allocated);
 struct MFace *DM_get_tessface_array(struct DerivedMesh *dm, bool *allocated);
+const MLoopTri *DM_get_looptri_array(
+        DerivedMesh *dm,
+        const MVert *mvert,
+        const MPoly *mpoly, int mpoly_len,
+        const MLoop *mloop, int mloop_len,
+        bool *allocated);
 
 #endif  /* __BKE_DERIVEDMESH_H__ */
diff --git a/source/blender/blenkernel/intern/DerivedMesh.c b/source/blender/blenkernel/intern/DerivedMesh.c
index 3f4b1ee..76cc6d0 100644
--- a/source/blender/blenkernel/intern/DerivedMesh.c
+++ b/source/blender/blenkernel/intern/DerivedMesh.c
@@ -3882,3 +3882,35 @@ MFace *DM_get_tessface_array(DerivedMesh *dm, bool *allocated)
 
 	return mface;
 }
+
+const MLoopTri *DM_get_looptri_array(
+        DerivedMesh *dm,
+        const MVert *mvert,
+        const MPoly *mpoly, int mpoly_len,
+        const MLoop *mloop, int mloop_len,
+        bool *allocated)
+{
+	const MLoopTri *looptri = dm->getLoopTriArray(dm);
+	*allocated = false;
+
+	if (looptri == NULL) {
+		if (mpoly_len > 0) {
+			const int looptris_num = poly_to_tri_count(mpoly_len, mloop_len);
+			MLoopTri *looptri_data;
+
+			looptri_data = MEM_mallocN(sizeof(MLoopTri) * looptris_num, __func__);
+
+			BKE_mesh_recalc_looptri(
+			        mloop, mpoly,
+			        mvert,
+			        mloop_len, mpoly_len,
+			        looptri_data);
+
+			looptri = looptri_data;
+
+			*allocated = true;
+		}
+	}
+
+	return looptri;
+}