Fix T85664: 3D Viewport issues with curve poly splines

Caused by cleanup in rBcdb3cbd64401, where an index
was used to index `float *` instead of `float[3]`.

1 files changed, 166 insertions, 1 deletions

diff --git a/source/blender/blenkernel/intern/displist.c b/source/blender/blenkernel/intern/displist.c
index dc274e25823..19ead2d972a 100644
--- a/source/blender/blenkernel/intern/displist.c
+++ b/source/blender/blenkernel/intern/displist.c
@@ -292,6 +292,170 @@ bool BKE_displist_surfindex_get(DispList *dl, int a, int *b, int *p1, int *p2, i
 /* ICC with the optimization -02 causes crashes. */
 #  pragma intel optimization_level 1
 #endif
+
+// static void curve_to_displist(Curve *cu,
+//                               ListBase *nubase,
+//                               const bool for_render,
+//                               ListBase *dispbase)
+// {
+//   DispList *dl;
+//   BezTriple *bezt, *prevbezt;
+//   BPoint *bp;
+//   float *data;
+//   int a, len, resolu;
+//   const bool editmode = (!for_render && (cu->editnurb || cu->editfont));
+
+//   LISTBASE_FOREACH (Nurb *, nu, nubase) {
+//     if (nu->hide != 0 && editmode) {
+//       continue;
+//     }
+
+//     if (for_render && cu->resolu_ren != 0) {
+//       resolu = cu->resolu_ren;
+//     }
+//     else {
+//       resolu = nu->resolu;
+//     }
+
+//     if (!BKE_nurb_check_valid_u(nu)) {
+//       /* pass */
+//     }
+//     else if (nu->type == CU_BEZIER) {
+//       /* count */
+//       len = 0;
+//       a = nu->pntsu - 1;
+//       if (nu->flagu & CU_NURB_CYCLIC) {
+//         a++;
+//       }
+
+//       prevbezt = nu->bezt;
+//       bezt = prevbezt + 1;
+//       while (a--) {
+//         if (a == 0 && (nu->flagu & CU_NURB_CYCLIC)) {
+//           bezt = nu->bezt;
+//         }
+
+//         if (prevbezt->h2 == HD_VECT && bezt->h1 == HD_VECT) {
+//           len++;
+//         }
+//         else {
+//           len += resolu;
+//         }
+
+//         if (a == 0 && (nu->flagu & CU_NURB_CYCLIC) == 0) {
+//           len++;
+//         }
+
+//         prevbezt = bezt;
+//         bezt++;
+//       }
+
+//       dl = MEM_callocN(sizeof(DispList), "makeDispListbez");
+//       /* len+1 because of 'forward_diff_bezier' function */
+//       dl->verts = MEM_mallocN((len + 1) * sizeof(float[3]), "dlverts");
+//       BLI_addtail(dispbase, dl);
+//       dl->parts = 1;
+//       dl->nr = len;
+//       dl->col = nu->mat_nr;
+//       dl->charidx = nu->charidx;
+
+//       data = dl->verts;
+
+//       /* check that (len != 2) so we don't immediately loop back on ourselves */
+//       if (nu->flagu & CU_NURB_CYCLIC && (dl->nr != 2)) {
+//         dl->type = DL_POLY;
+//         a = nu->pntsu;
+//       }
+//       else {
+//         dl->type = DL_SEGM;
+//         a = nu->pntsu - 1;
+//       }
+
+//       prevbezt = nu->bezt;
+//       bezt = prevbezt + 1;
+
+//       while (a--) {
+//         if (a == 0 && dl->type == DL_POLY) {
+//           bezt = nu->bezt;
+//         }
+
+//         if (prevbezt->h2 == HD_VECT && bezt->h1 == HD_VECT) {
+//           copy_v3_v3(data, prevbezt->vec[1]);
+//           data += 3;
+//         }
+//         else {
+//           int j;
+//           for (j = 0; j < 3; j++) {
+//             BKE_curve_forward_diff_bezier(prevbezt->vec[1][j],
+//                                           prevbezt->vec[2][j],
+//                                           bezt->vec[0][j],
+//                                           bezt->vec[1][j],
+//                                           data + j,
+//                                           resolu,
+//                                           sizeof(float[3]));
+//           }
+
+//           data += 3 * resolu;
+//         }
+
+//         if (a == 0 && dl->type == DL_SEGM) {
+//           copy_v3_v3(data, bezt->vec[1]);
+//         }
+
+//         prevbezt = bezt;
+//         bezt++;
+//       }
+//     }
+//     else if (nu->type == CU_NURBS) {
+//       len = (resolu * SEGMENTSU(nu));
+
+//       dl = MEM_callocN(sizeof(DispList), "makeDispListsurf");
+//       dl->verts = MEM_mallocN(len * sizeof(float[3]), "dlverts");
+//       BLI_addtail(dispbase, dl);
+//       dl->parts = 1;
+
+//       dl->nr = len;
+//       dl->col = nu->mat_nr;
+//       dl->charidx = nu->charidx;
+
+//       data = dl->verts;
+//       if (nu->flagu & CU_NURB_CYCLIC) {
+//         dl->type = DL_POLY;
+//       }
+//       else {
+//         dl->type = DL_SEGM;
+//       }
+//       BKE_nurb_makeCurve(nu, data, NULL, NULL, NULL, resolu, sizeof(float[3]));
+//     }
+//     else if (nu->type == CU_POLY) {
+//       len = nu->pntsu;
+//       dl = MEM_callocN(sizeof(DispList), "makeDispListpoly");
+//       dl->verts = MEM_mallocN(len * sizeof(float[3]), "dlverts");
+//       BLI_addtail(dispbase, dl);
+//       dl->parts = 1;
+//       dl->nr = len;
+//       dl->col = nu->mat_nr;
+//       dl->charidx = nu->charidx;
+
+//       data = dl->verts;
+//       if ((nu->flagu & CU_NURB_CYCLIC) && (dl->nr != 2)) {
+//         dl->type = DL_POLY;
+//       }
+//       else {
+//         dl->type = DL_SEGM;
+//       }
+
+//       a = len;
+//       bp = nu->bp;
+//       while (a--) {
+//         copy_v3_v3(data, bp->vec);
+//         bp++;
+//         data += 3;
+//       }
+//     }
+//   }
+// }
+
 static void curve_to_displist(const Curve *cu,
                               const ListBase *nubase,
                               const bool for_render,
@@ -420,9 +584,10 @@ static void curve_to_displist(const Curve *cu,
       dl->charidx = nu->charidx;
       dl->type = (is_cyclic && (dl->nr != 2)) ? DL_POLY : DL_SEGM;
 
+      float(*coords)[3] = (float(*)[3])dl->verts;
       for (int i = 0; i < len; i++) {
         const BPoint *bp = &nu->bp[i];
-        copy_v3_v3(&dl->verts[i], bp->vec);
+        copy_v3_v3(coords[i], bp->vec);
       }
     }
   }