Overlay: Fade Inactive Geometry

This implements a new overlay that blends the bakground color over the
objects that are not in the same mode as the active object, making
them fade with the background.
This is especially needed for sculpt mode as there is no other overlay
or indication in the viewport to display which object is active.

This is intended to be used with D7510 in order to have a faster
workflow when sculpting models with multiple objects.

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D8679

2 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_view3d_defaults.h b/source/blender/makesdna/DNA_view3d_defaults.h
index 62e3d14bd0c..68f23b33d07 100644
--- a/source/blender/makesdna/DNA_view3d_defaults.h
+++ b/source/blender/makesdna/DNA_view3d_defaults.h
@@ -52,6 +52,7 @@
   { \
     .wireframe_threshold = 1.0f, \
     .xray_alpha_bone = 0.5f, \
+    .fade_alpha = 0.40f, \
     .texture_paint_mode_opacity = 1.0f, \
     .weight_paint_mode_opacity = 1.0f, \
     .vertex_paint_mode_opacity = 1.0f, \
diff --git a/source/blender/makesdna/DNA_view3d_types.h b/source/blender/makesdna/DNA_view3d_types.h
index 64f26a756db..3fc8b05c8b4 100644
--- a/source/blender/makesdna/DNA_view3d_types.h
+++ b/source/blender/makesdna/DNA_view3d_types.h
@@ -218,6 +218,9 @@ typedef struct View3DOverlay {
   /** Armature edit/pose mode settings. */
   float xray_alpha_bone;
 
+  /** Darken Inactive. */
+  float fade_alpha;
+
   /** Other settings. */
   float wireframe_threshold;
 
@@ -230,6 +233,7 @@ typedef struct View3DOverlay {
   float gpencil_vertex_paint_opacity;
   /** Handles display type for curves. */
   int handle_display;
+  char _pad[4];
 } View3DOverlay;
 
 /* View3DOverlay->handle_display */
@@ -503,6 +507,7 @@ enum {
   V3D_OVERLAY_HIDE_OBJECT_XTRAS = (1 << 9),
   V3D_OVERLAY_HIDE_OBJECT_ORIGINS = (1 << 10),
   V3D_OVERLAY_STATS = (1 << 11),
+  V3D_OVERLAY_FADE_INACTIVE = (1 << 12),
 };
 
 /** #View3DOverlay.edit_flag */