Cleanup/Refactor: Unify functions that redraw the depth buffer

Now `ED_view3d_backbuf_depth_validate`, `ED_view3d_draw_depth` and
`ED_view3d_draw_depth_gpencil` are unified in `ED_view3d_depth_override`.

This new function replaces `ED_view3d_autodist_init`.

Also, since `ED_view3d_depth_update` depends on the render context, and
changing the context is a slow operation, that function also was removed,
and the depth buffer cached is now updated inside the new unified drawing
function when the "bool update_cache" parameter is true.

Finally `V3D_INVALID_BACKBUF` flag has been renamed and moved to
`runtime.flag`.

Differential revision: https://developer.blender.org/D10678

1 files changed, 8 insertions, 4 deletions

diff --git a/source/blender/editors/gpencil/gpencil_primitive.c b/source/blender/editors/gpencil/gpencil_primitive.c
index dfff0ce639e..3d20e32ed49 100644
--- a/source/blender/editors/gpencil/gpencil_primitive.c
+++ b/source/blender/editors/gpencil/gpencil_primitive.c
@@ -785,10 +785,14 @@ static void gpencil_primitive_update_strokes(bContext *C, tGPDprimitive *tgpi)
 
     /* need to restore the original projection settings before packing up */
     view3d_region_operator_needs_opengl(tgpi->win, tgpi->region);
-    ED_view3d_autodist_init(tgpi->depsgraph,
-                            tgpi->region,
-                            tgpi->v3d,
-                            (ts->gpencil_v3d_align & GP_PROJECT_DEPTH_STROKE) ? 1 : 0);
+    ED_view3d_depth_override(tgpi->depsgraph,
+                             tgpi->region,
+                             tgpi->v3d,
+                             NULL,
+                             (ts->gpencil_v3d_align & GP_PROJECT_DEPTH_STROKE) ?
+                                 V3D_DEPTH_GPENCIL_ONLY :
+                                 V3D_DEPTH_NO_GPENCIL,
+                             false);
 
     depth_arr = MEM_mallocN(sizeof(float) * gps->totpoints, "depth_points");
     tGPspoint *ptc = &points2D[0];