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_utils.c b/source/blender/editors/gpencil/gpencil_utils.c
index c9ef340b9d3..4da21bd05ee 100644
--- a/source/blender/editors/gpencil/gpencil_utils.c
+++ b/source/blender/editors/gpencil/gpencil_utils.c
@@ -680,7 +680,7 @@ void gpencil_point_conversion_init(bContext *C, GP_SpaceConversion *r_gsc)
     view3d_operator_needs_opengl(C);
 
     view3d_region_operator_needs_opengl(win, region);
-    ED_view3d_depth_override(depsgraph, region, v3d, NULL, V3D_DEPTH_NO_GPENCIL, false);
+    ED_view3d_depth_override(depsgraph, region, v3d, NULL, V3D_DEPTH_NO_GPENCIL, NULL);
 
     /* for camera view set the subrect */
     if (rv3d->persp == RV3D_CAMOB) {