3 files changed, 136 insertions, 0 deletions

diff --git a/source/blender/draw/engines/overlay/overlay_engine.c b/source/blender/draw/engines/overlay/overlay_engine.c
index 9cdd371ec4e..e93b505e8b7 100644
--- a/source/blender/draw/engines/overlay/overlay_engine.c
+++ b/source/blender/draw/engines/overlay/overlay_engine.c
@@ -196,6 +196,7 @@ static void OVERLAY_cache_init(void *vedata)
   OVERLAY_antialiasing_cache_init(vedata);
   OVERLAY_armature_cache_init(vedata);
   OVERLAY_background_cache_init(vedata);
+  OVERLAY_fade_cache_init(vedata);
   OVERLAY_extra_cache_init(vedata);
   OVERLAY_facing_cache_init(vedata);
   OVERLAY_gpencil_cache_init(vedata);
@@ -259,6 +260,27 @@ static bool overlay_object_is_edit_mode(const OVERLAY_PrivateData *pd, const Obj
   return false;
 }
 
+static bool overlay_should_fade_object(Object *ob, Object *active_object)
+{
+  if (!active_object || !ob) {
+    return false;
+  }
+
+  if (ELEM(active_object->mode, OB_MODE_OBJECT, OB_MODE_POSE)) {
+    return false;
+  }
+
+  if ((active_object->mode & ob->mode) != 0) {
+    return false;
+  }
+
+  if (ob->base_flag & BASE_FROM_DUPLI) {
+    return false;
+  }
+
+  return true;
+}
+
 static void OVERLAY_cache_populate(void *vedata, Object *ob)
 {
   OVERLAY_Data *data = vedata;
@@ -295,6 +317,8 @@ static void OVERLAY_cache_populate(void *vedata, Object *ob)
   const bool draw_surface = (ob->dt >= OB_WIRE) && (renderable || (ob->dt == OB_WIRE));
   const bool draw_facing = draw_surface && (pd->overlay.flag & V3D_OVERLAY_FACE_ORIENTATION) &&
                            !is_select;
+  const bool draw_fade = draw_surface && (pd->overlay.flag & V3D_OVERLAY_FADE_INACTIVE) &&
+                         overlay_should_fade_object(ob, draw_ctx->obact);
   const bool draw_bones = (pd->overlay.flag & V3D_OVERLAY_HIDE_BONES) == 0;
   const bool draw_wires = draw_surface && has_surface &&
                           (pd->wireframe_mode || !pd->hide_overlays);
@@ -315,6 +339,9 @@ static void OVERLAY_cache_populate(void *vedata, Object *ob)
   bool do_init;
   OVERLAY_DupliData *dupli = OVERLAY_duplidata_get(ob, vedata, &do_init);
 
+  if (draw_fade) {
+    OVERLAY_fade_cache_populate(vedata, ob);
+  }
   if (draw_facing) {
     OVERLAY_facing_cache_populate(vedata, ob);
   }
@@ -511,6 +538,7 @@ static void OVERLAY_draw_scene(void *vedata)
   }
 
   OVERLAY_image_draw(vedata);
+  OVERLAY_fade_draw(vedata);
   OVERLAY_facing_draw(vedata);
   OVERLAY_extra_blend_draw(vedata);
 
@@ -538,6 +566,7 @@ static void OVERLAY_draw_scene(void *vedata)
     GPU_framebuffer_bind(fbl->overlay_in_front_fb);
   }
 
+  OVERLAY_fade_infront_draw(vedata);
   OVERLAY_facing_infront_draw(vedata);
 
   if (DRW_state_is_fbo()) {
diff --git a/source/blender/draw/engines/overlay/overlay_fade.c b/source/blender/draw/engines/overlay/overlay_fade.c
new file mode 100644
index 00000000000..0971021f1c0
--- /dev/null
+++ b/source/blender/draw/engines/overlay/overlay_fade.c
@@ -0,0 +1,99 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright 2020, Blender Foundation.
+ */
+
+/** \file
+ * \ingroup draw_engine
+ */
+
+#include "BKE_paint.h"
+#include "DRW_render.h"
+
+#include "ED_view3d.h"
+
+#include "overlay_private.h"
+
+void OVERLAY_fade_init(OVERLAY_Data *UNUSED(vedata))
+{
+}
+
+void OVERLAY_fade_cache_init(OVERLAY_Data *vedata)
+{
+  OVERLAY_PassList *psl = vedata->psl;
+  OVERLAY_PrivateData *pd = vedata->stl->pd;
+
+  for (int i = 0; i < 2; i++) {
+    /* Non Meshes Pass (Camera, empties, lights ...) */
+    DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_EQUAL | DRW_STATE_BLEND_ALPHA;
+    DRW_PASS_CREATE(psl->fade_ps[i], state | pd->clipping_state);
+
+    GPUShader *sh = OVERLAY_shader_uniform_color();
+    pd->fade_grp[i] = DRW_shgroup_create(sh, psl->fade_ps[i]);
+    DRW_shgroup_uniform_block(pd->fade_grp[i], "globalsBlock", G_draw.block_ubo);
+
+    const DRWContextState *draw_ctx = DRW_context_state_get();
+    float color[4];
+    ED_view3d_background_color_get(draw_ctx->scene, draw_ctx->v3d, color);
+    color[3] = pd->overlay.fade_alpha;
+    if (draw_ctx->v3d->shading.background_type == V3D_SHADING_BACKGROUND_THEME) {
+      srgb_to_linearrgb_v4(color, color);
+    }
+    DRW_shgroup_uniform_vec4_copy(pd->fade_grp[i], "color", color);
+  }
+
+  if (!pd->use_in_front) {
+    pd->fade_grp[IN_FRONT] = pd->fade_grp[NOT_IN_FRONT];
+  }
+}
+
+void OVERLAY_fade_cache_populate(OVERLAY_Data *vedata, Object *ob)
+{
+  OVERLAY_PrivateData *pd = vedata->stl->pd;
+
+  if (pd->xray_enabled) {
+    return;
+  }
+
+  const DRWContextState *draw_ctx = DRW_context_state_get();
+  const bool use_sculpt_pbvh = BKE_sculptsession_use_pbvh_draw(ob, draw_ctx->v3d) &&
+                               !DRW_state_is_image_render();
+  const bool is_xray = (ob->dtx & OB_DRAW_IN_FRONT) != 0;
+
+  if (use_sculpt_pbvh) {
+    DRW_shgroup_call_sculpt(pd->fade_grp[is_xray], ob, false, false);
+  }
+  else {
+    struct GPUBatch *geom = DRW_cache_object_surface_get(ob);
+    if (geom) {
+      DRW_shgroup_call(pd->fade_grp[is_xray], geom, ob);
+    }
+  }
+}
+
+void OVERLAY_fade_draw(OVERLAY_Data *vedata)
+{
+  OVERLAY_PassList *psl = vedata->psl;
+
+  DRW_draw_pass(psl->fade_ps[NOT_IN_FRONT]);
+}
+
+void OVERLAY_fade_infront_draw(OVERLAY_Data *vedata)
+{
+  OVERLAY_PassList *psl = vedata->psl;
+
+  DRW_draw_pass(psl->fade_ps[IN_FRONT]);
+}
diff --git a/source/blender/draw/engines/overlay/overlay_private.h b/source/blender/draw/engines/overlay/overlay_private.h
index b84b66ca83d..2cf2ca34801 100644
--- a/source/blender/draw/engines/overlay/overlay_private.h
+++ b/source/blender/draw/engines/overlay/overlay_private.h
@@ -100,6 +100,7 @@ typedef struct OVERLAY_PassList {
   DRWPass *extra_grid_ps;
   DRWPass *gpencil_canvas_ps;
   DRWPass *facing_ps[2];
+  DRWPass *fade_ps[2];
   DRWPass *grid_ps;
   DRWPass *image_background_ps;
   DRWPass *image_empties_ps;
@@ -268,6 +269,7 @@ typedef struct OVERLAY_PrivateData {
   DRWShadingGroup *edit_uv_stretching_grp;
   DRWShadingGroup *extra_grid_grp;
   DRWShadingGroup *facing_grp[2];
+  DRWShadingGroup *fade_grp[2];
   DRWShadingGroup *motion_path_lines_grp;
   DRWShadingGroup *motion_path_points_grp;
   DRWShadingGroup *outlines_grp;
@@ -566,6 +568,12 @@ void OVERLAY_facing_cache_populate(OVERLAY_Data *vedata, Object *ob);
 void OVERLAY_facing_draw(OVERLAY_Data *vedata);
 void OVERLAY_facing_infront_draw(OVERLAY_Data *vedata);
 
+void OVERLAY_fade_init(OVERLAY_Data *vedata);
+void OVERLAY_fade_cache_init(OVERLAY_Data *vedata);
+void OVERLAY_fade_cache_populate(OVERLAY_Data *vedata, Object *ob);
+void OVERLAY_fade_draw(OVERLAY_Data *vedata);
+void OVERLAY_fade_infront_draw(OVERLAY_Data *vedata);
+
 void OVERLAY_grid_init(OVERLAY_Data *vedata);
 void OVERLAY_grid_cache_init(OVERLAY_Data *vedata);
 void OVERLAY_grid_draw(OVERLAY_Data *vedata);