bring back possibility to override camera per view

this can now be found in the sidebar View panel

- uses existing 'lock_camera_and_layers' but renames the property to
'use_local_camera'
- uses RNA_def_property_boolean_negative_sdna to flip the value
- remove the local view code in
rna_SpaceView3D_lock_camera_and_layers_set
- update Python code
- update Addons code will be separate commit

Fixes T60756

Reviewers: billreynish, brecht

Maniphest Tasks: T60756

Differential Revision: https://developer.blender.org/D4247

intern/cycles/blender/blender_camera.cpp

@@ -648,7 +648,7 @@ static void blender_camera_from_view(BlenderCamera *bcam,
 
 	if(b_rv3d.view_perspective() == BL::RegionView3D::view_perspective_CAMERA) {
 		/* camera view */
-		BL::Object b_ob = (b_v3d.lock_camera_and_layers())? b_scene.camera(): b_v3d.camera();
+		BL::Object b_ob = (b_v3d.use_local_camera())? b_v3d.camera(): b_scene.camera();
 
 		if(b_ob) {
 			blender_camera_from_object(bcam, b_engine, b_ob, skip_panorama);
@@ -784,7 +784,7 @@ static void blender_camera_border(BlenderCamera *bcam,
 		return;
 	}
 
-	BL::Object b_ob = (b_v3d.lock_camera_and_layers())? b_scene.camera(): b_v3d.camera();
+	BL::Object b_ob = (b_v3d.use_local_camera())? b_v3d.camera(): b_scene.camera();
 
 	if(!b_ob)
 		return;

release/scripts/startup/bl_operators/object.py

@@ -133,7 +133,7 @@ class SelectCamera(Operator):
         scene = context.scene
         view_layer = context.view_layer
         view = context.space_data
-        if view.type == 'VIEW_3D' and not view.lock_camera_and_layers:
+        if view.type == 'VIEW_3D' and view.use_local_camera:
             camera = view.camera
         else:
             camera = scene.camera

release/scripts/startup/bl_ui/space_view3d.py

@@ -4206,7 +4206,10 @@ class VIEW3D_PT_view3d_properties(Panel):
         col = flow.column()
 
         subcol = col.column()
-        subcol.enabled = not view.lock_camera_and_layers
+        subcol.prop(view, "use_local_camera")
+
+        subcol = col.column()
+        subcol.enabled = view.use_local_camera
         subcol.prop(view, "camera", text="Local Camera")
 
         subcol = col.column(align=True)

source/blender/makesrna/intern/rna_space.c

@@ -531,31 +531,15 @@ static void rna_SpaceView3D_camera_update(Main *bmain, Scene *scene, PointerRNA
 	}
 }
 
-static void rna_SpaceView3D_lock_camera_and_layers_set(PointerRNA *ptr, bool value)
+static void rna_SpaceView3D_use_local_camera_set(PointerRNA *ptr, bool value)
 {
 	View3D *v3d = (View3D *)(ptr->data);
 	bScreen *sc = (bScreen *)ptr->id.data;
 
-	v3d->scenelock = value;
+	v3d->scenelock = !value;
 
-	if (value) {
+	if (!value) {
 		Scene *scene = ED_screen_scene_find(sc, G_MAIN->wm.first);
-
-		/* TODO: restore local view. */
-#if 0
-		int bit;
-		v3d->lay = scene->lay;
-
-		/* seek for layact */
-		bit = 0;
-		while (bit < 32) {
-			if (v3d->lay & (1u << bit)) {
-				v3d->layact = (1u << bit);
-				break;
-			}
-			bit++;
-		}
-#endif
 		v3d->camera = scene->camera;
 	}
 }
@@ -3189,12 +3173,11 @@ static void rna_def_space_view3d(BlenderRNA *brna)
 	RNA_def_property_ui_text(prop, "Tool Gizmo", "Active tool gizmo");
 	RNA_def_property_update(prop, NC_SPACE | ND_SPACE_VIEW3D, NULL);
 
-	prop = RNA_def_property(srna, "lock_camera_and_layers", PROP_BOOLEAN, PROP_NONE);
-	RNA_def_property_boolean_sdna(prop, NULL, "scenelock", 1);
-	RNA_def_property_boolean_funcs(prop, NULL, "rna_SpaceView3D_lock_camera_and_layers_set");
-	RNA_def_property_ui_text(prop, "Lock Camera and Layers",
-	                         "Use the scene's active camera and layers in this view, rather than local layers");
-	RNA_def_property_ui_icon(prop, ICON_LOCKVIEW_OFF, 1);
+	prop = RNA_def_property(srna, "use_local_camera", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_negative_sdna(prop, NULL, "scenelock", 1);
+	RNA_def_property_boolean_funcs(prop, NULL, "rna_SpaceView3D_use_local_camera_set");
+	RNA_def_property_ui_text(prop, "Use Local Camera",
+	                         "Use a local camera in this view, rather than scene's active camera camera");
 	RNA_def_property_update(prop, NC_SPACE | ND_SPACE_VIEW3D, NULL);
 
 	prop = RNA_def_property(srna, "region_3d", PROP_POINTER, PROP_NONE);