Refactor: Do not keep a copy of depth buffer in RegionView3D

The depth cache (located in `RegionView3D::depths`) is used for quick
and simple occlusion testing in:
- particle selection,
- "Draw Curve" operator and
- "Interactive Light Track to Cursor" operator,

However, keeping a texture buffer in cache is not a recommended practice.

For displays with high resolution like 8k this represents something
around 132MB.

Also, currently, each call to `ED_view3d_depth_override` invalidates
the depth cache. So that depth is never reused in multiple calls from
an operator (this was not the case in blender 2.79).

This commit allows to create a depth cache and release it in the same
operator. Thus, the buffer is kept in cache for a short time, freeing
up space.

No functional changes.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/editors/gpencil/gpencil_primitive.c b/source/blender/editors/gpencil/gpencil_primitive.c
index 5f02bbf0a77..a2b4e5dee64 100644
--- a/source/blender/editors/gpencil/gpencil_primitive.c
+++ b/source/blender/editors/gpencil/gpencil_primitive.c
@@ -792,7 +792,7 @@ static void gpencil_primitive_update_strokes(bContext *C, tGPDprimitive *tgpi)
                              (ts->gpencil_v3d_align & GP_PROJECT_DEPTH_STROKE) ?
                                  V3D_DEPTH_GPENCIL_ONLY :
                                  V3D_DEPTH_NO_GPENCIL,
-                             false);
+                             NULL);
 
     depth_arr = MEM_mallocN(sizeof(float) * gps->totpoints, "depth_points");
     tGPspoint *ptc = &points2D[0];