Cycles: add experimental preference to replace magic debug value 256

Previously you'd have to run with --debug-value 256, now just make it
a preference so the Debug panel can be always available for developers.

5 files changed, 18 insertions, 5 deletions

diff --git a/intern/cycles/blender/addon/engine.py b/intern/cycles/blender/addon/engine.py
index e7ea5e7a1f6..7566ca28dd7 100644
--- a/intern/cycles/blender/addon/engine.py
+++ b/intern/cycles/blender/addon/engine.py
@@ -179,7 +179,8 @@ def reset(engine, data, depsgraph):
     import _cycles
     import bpy
 
-    if bpy.app.debug_value == 256:
+    prefs = bpy.context.preferences
+    if prefs.experimental.use_cycles_debug and prefs.view.show_developer_ui:
         _cycles.debug_flags_update(depsgraph.scene.as_pointer())
     else:
         _cycles.debug_flags_reset()
diff --git a/intern/cycles/blender/addon/ui.py b/intern/cycles/blender/addon/ui.py
index aa0a47eb9c7..cfb22885eab 100644
--- a/intern/cycles/blender/addon/ui.py
+++ b/intern/cycles/blender/addon/ui.py
@@ -1987,7 +1987,10 @@ class CYCLES_RENDER_PT_debug(CyclesButtonsPanel, Panel):
 
     @classmethod
     def poll(cls, context):
-        return CyclesButtonsPanel.poll(context) and bpy.app.debug_value == 256
+        prefs = bpy.context.preferences
+        return (CyclesButtonsPanel.poll(context)
+                and prefs.experimental.use_cycles_debug
+                and prefs.view.show_developer_ui)
 
     def draw(self, context):
         layout = self.layout
diff --git a/release/scripts/startup/bl_ui/space_userpref.py b/release/scripts/startup/bl_ui/space_userpref.py
index c1502165e44..e5171df597a 100644
--- a/release/scripts/startup/bl_ui/space_userpref.py
+++ b/release/scripts/startup/bl_ui/space_userpref.py
@@ -2114,8 +2114,10 @@ class ExperimentalPanel:
             split = layout.split(factor=0.66)
             col = split.split()
             col.prop(experimental, **prop_keywords)
-            col = split.split()
-            col.operator("wm.url_open", text=task, icon='URL').url = self.url_prefix + task
+
+            if task:
+                col = split.split()
+                col.operator("wm.url_open", text=task, icon='URL').url = self.url_prefix + task
 
 """
 # Example panel, leave it here so we always have a template to follow even
@@ -2163,6 +2165,7 @@ class USERPREF_PT_experimental_debugging(ExperimentalPanel, Panel):
         self._draw_items(
             context, (
                 ({"property": "use_undo_legacy"}, "T60695"),
+                ({"property": "use_cycles_debug"}, None),
             ),
         )
 
diff --git a/source/blender/makesdna/DNA_userdef_types.h b/source/blender/makesdna/DNA_userdef_types.h
index 9ea62183b87..d751ad9ac47 100644
--- a/source/blender/makesdna/DNA_userdef_types.h
+++ b/source/blender/makesdna/DNA_userdef_types.h
@@ -621,8 +621,9 @@ typedef struct UserDef_Experimental {
   char use_undo_legacy;
   char use_new_particle_system;
   char use_new_hair_type;
+  char use_cycles_debug;
   /** `makesdna` does not allow empty structs. */
-  char _pad0[5];
+  char _pad0[4];
 } UserDef_Experimental;
 
 #define USER_EXPERIMENTAL_TEST(userdef, member) \
diff --git a/source/blender/makesrna/intern/rna_userdef.c b/source/blender/makesrna/intern/rna_userdef.c
index 6a6d9f3054f..c31b313d827 100644
--- a/source/blender/makesrna/intern/rna_userdef.c
+++ b/source/blender/makesrna/intern/rna_userdef.c
@@ -6079,6 +6079,11 @@ static void rna_def_userdef_experimental(BlenderRNA *brna)
   prop = RNA_def_property(srna, "use_new_hair_type", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, NULL, "use_new_hair_type", 1);
   RNA_def_property_ui_text(prop, "New Hair Type", "Enable the new hair type in the ui");
+
+  prop = RNA_def_property(srna, "use_cycles_debug", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "use_cycles_debug", 1);
+  RNA_def_property_ui_text(prop, "Cycles Debug", "Enable Cycles debugging options for developers");
+  RNA_def_property_update(prop, 0, "rna_userdef_update");
 }
 
 static void rna_def_userdef_addon_collection(BlenderRNA *brna, PropertyRNA *cprop)