Fix T75244: Screw Modifier Crash

Draw batch extraction wrongly assumed that when mapped extraction
happened that all original data could be found. This is not the case as
mapped extraction is also enabled when part of the data is present.

This fix does additional nullptr checks.

1 files changed, 16 insertions, 15 deletions

diff --git a/source/blender/draw/intern/draw_cache_extract_mesh.c b/source/blender/draw/intern/draw_cache_extract_mesh.c
index f54fef63c82..3f7421dc2f6 100644
--- a/source/blender/draw/intern/draw_cache_extract_mesh.c
+++ b/source/blender/draw/intern/draw_cache_extract_mesh.c
@@ -606,7 +606,7 @@ static void extract_lines_loop_mesh(const MeshRenderData *mr,
 {
   const MEdge *medge = &mr->medge[mloop->e];
   if (!((mr->use_hide && (medge->flag & ME_HIDE)) ||
-        ((mr->extract_type == MR_EXTRACT_MAPPED) &&
+        ((mr->extract_type == MR_EXTRACT_MAPPED) && (mr->e_origindex) &&
          (mr->e_origindex[mloop->e] == ORIGINDEX_NONE)))) {
     int loopend = mpoly->totloop + mpoly->loopstart - 1;
     int other_loop = (l == loopend) ? mpoly->loopstart : (l + 1);
@@ -639,7 +639,7 @@ static void extract_lines_ledge_mesh(const MeshRenderData *mr,
   int ledge_idx = mr->edge_len + e;
   int edge_idx = mr->ledges[e];
   if (!((mr->use_hide && (medge->flag & ME_HIDE)) ||
-        ((mr->extract_type == MR_EXTRACT_MAPPED) &&
+        ((mr->extract_type == MR_EXTRACT_MAPPED) && (mr->e_origindex) &&
          (mr->e_origindex[edge_idx] == ORIGINDEX_NONE)))) {
     int l = mr->loop_len + e * 2;
     GPU_indexbuf_set_line_verts(elb, ledge_idx, l, l + 1);
@@ -765,7 +765,7 @@ BLI_INLINE void vert_set_mesh(GPUIndexBufBuilder *elb,
 {
   const MVert *mvert = &mr->mvert[vert_idx];
   if (!((mr->use_hide && (mvert->flag & ME_HIDE)) ||
-        ((mr->extract_type == MR_EXTRACT_MAPPED) &&
+        ((mr->extract_type == MR_EXTRACT_MAPPED) && (mr->v_origindex) &&
          (mr->v_origindex[vert_idx] == ORIGINDEX_NONE)))) {
     GPU_indexbuf_set_point_vert(elb, vert_idx, loop);
   }
@@ -937,7 +937,7 @@ static void extract_lines_paint_mask_loop_mesh(const MeshRenderData *mr,
   const int edge_idx = mloop->e;
   const MEdge *medge = &mr->medge[edge_idx];
   if (!((mr->use_hide && (medge->flag & ME_HIDE)) ||
-        ((mr->extract_type == MR_EXTRACT_MAPPED) &&
+        ((mr->extract_type == MR_EXTRACT_MAPPED) && (mr->e_origindex) &&
          (mr->e_origindex[edge_idx] == ORIGINDEX_NONE)))) {
 
     int loopend = mpoly->totloop + mpoly->loopstart - 1;
@@ -1333,7 +1333,7 @@ static void extract_edituv_points_loop_mesh(const MeshRenderData *mr,
                                             const MPoly *mpoly,
                                             void *data)
 {
-  const bool real_vert = (mr->extract_type == MR_EXTRACT_MAPPED &&
+  const bool real_vert = (mr->extract_type == MR_EXTRACT_MAPPED && (mr->v_origindex) &&
                           mr->v_origindex[mloop->v] != ORIGINDEX_NONE);
   edituv_point_add(
       data, ((mpoly->flag & ME_HIDE) != 0) || !real_vert, (mpoly->flag & ME_FACE_SEL) != 0, l);
@@ -1407,7 +1407,7 @@ static void extract_edituv_fdots_loop_mesh(const MeshRenderData *mr,
                                            const MPoly *mpoly,
                                            void *data)
 {
-  const bool real_fdot = (mr->extract_type == MR_EXTRACT_MAPPED &&
+  const bool real_fdot = (mr->extract_type == MR_EXTRACT_MAPPED && mr->p_origindex &&
                           mr->p_origindex[p] != ORIGINDEX_NONE);
   const bool subd_fdot = (!mr->use_subsurf_fdots ||
                           (mr->mvert[mloop->v].flag & ME_VERT_FACEDOT) != 0);
@@ -1518,7 +1518,8 @@ static void extract_pos_nor_loop_mesh(const MeshRenderData *mr,
   vert->nor = data->packed_nor[mloop->v];
   /* Flag for paint mode overlay. */
   if (mpoly->flag & ME_HIDE || mvert->flag & ME_HIDE ||
-      ((mr->extract_type == MR_EXTRACT_MAPPED) && (mr->v_origindex[mloop->v] == ORIGINDEX_NONE))) {
+      ((mr->extract_type == MR_EXTRACT_MAPPED) && (mr->v_origindex) &&
+       (mr->v_origindex[mloop->v] == ORIGINDEX_NONE))) {
     vert->nor.w = -1;
   }
   else if (mvert->flag & SELECT) {
@@ -1647,8 +1648,8 @@ static void extract_lnor_hq_loop_mesh(
   }
 
   /* Flag for paint mode overlay. */
-  if (mpoly->flag & ME_HIDE ||
-      (mr->extract_type == MR_EXTRACT_MAPPED && mr->v_origindex[mloop->v] == ORIGINDEX_NONE)) {
+  if (mpoly->flag & ME_HIDE || (mr->extract_type == MR_EXTRACT_MAPPED && (mr->v_origindex) &&
+                                mr->v_origindex[mloop->v] == ORIGINDEX_NONE)) {
     lnor_data->w = -1;
   }
   else if (mpoly->flag & ME_FACE_SEL) {
@@ -1723,8 +1724,8 @@ static void extract_lnor_loop_mesh(
   }
 
   /* Flag for paint mode overlay. */
-  if (mpoly->flag & ME_HIDE ||
-      (mr->extract_type == MR_EXTRACT_MAPPED && mr->v_origindex[mloop->v] == ORIGINDEX_NONE)) {
+  if (mpoly->flag & ME_HIDE || (mr->extract_type == MR_EXTRACT_MAPPED && (mr->v_origindex) &&
+                                mr->v_origindex[mloop->v] == ORIGINDEX_NONE)) {
     lnor_data->w = -1;
   }
   else if (mpoly->flag & ME_FACE_SEL) {
@@ -3914,8 +3915,8 @@ static void extract_fdots_nor_finish(const MeshRenderData *mr, void *buf, void *
     for (int f = 0; f < mr->poly_len; f++) {
       efa = BM_face_at_index(mr->bm, f);
       const bool is_face_hidden = BM_elem_flag_test(efa, BM_ELEM_HIDDEN);
-      if (is_face_hidden ||
-          (mr->extract_type == MR_EXTRACT_MAPPED && mr->p_origindex[f] == ORIGINDEX_NONE)) {
+      if (is_face_hidden || (mr->extract_type == MR_EXTRACT_MAPPED && mr->p_origindex &&
+                             mr->p_origindex[f] == ORIGINDEX_NONE)) {
         nor[f] = GPU_normal_convert_i10_v3(invalid_normal);
         nor[f].w = NOR_AND_FLAG_HIDDEN;
       }
@@ -3932,8 +3933,8 @@ static void extract_fdots_nor_finish(const MeshRenderData *mr, void *buf, void *
     for (int f = 0; f < mr->poly_len; f++) {
       efa = bm_original_face_get(mr, f);
       const bool is_face_hidden = efa && BM_elem_flag_test(efa, BM_ELEM_HIDDEN);
-      if (is_face_hidden ||
-          (mr->extract_type == MR_EXTRACT_MAPPED && mr->p_origindex[f] == ORIGINDEX_NONE)) {
+      if (is_face_hidden || (mr->extract_type == MR_EXTRACT_MAPPED && mr->p_origindex &&
+                             mr->p_origindex[f] == ORIGINDEX_NONE)) {
         nor[f] = GPU_normal_convert_i10_v3(invalid_normal);
         nor[f].w = NOR_AND_FLAG_HIDDEN;
       }