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, 6 insertions, 1 deletions

diff --git a/source/blender/editors/include/ED_particle.h b/source/blender/editors/include/ED_particle.h
index e84298bd9c2..6d0172e724a 100644
--- a/source/blender/editors/include/ED_particle.h
+++ b/source/blender/editors/include/ED_particle.h
@@ -34,6 +34,7 @@ struct ParticleSystem;
 struct Scene;
 struct UndoType;
 struct ViewLayer;
+struct wmGenericUserData;
 struct bContext;
 struct rcti;
 
@@ -68,7 +69,11 @@ void PE_update_object(struct Depsgraph *depsgraph,
 bool PE_mouse_particles(
     struct bContext *C, const int mval[2], bool extend, bool deselect, bool toggle);
 bool PE_box_select(struct bContext *C, const struct rcti *rect, const int sel_op);
-bool PE_circle_select(struct bContext *C, const int sel_op, const int mval[2], float rad);
+bool PE_circle_select(struct bContext *C,
+                      struct wmGenericUserData *wm_userdata,
+                      const int sel_op,
+                      const int mval[2],
+                      float rad);
 int PE_lasso_select(struct bContext *C,
                     const int mcoords[][2],
                     const int mcoords_len,