ShaderFX/LibOverride: Add `BKE_shaderfx_is_nonlocal_in_liboverride` util.

Used to detect if a shaderfx is purely local, or comes from linked data,
in case of a liboverride.

Not actually used yet since we do not currently support adding
shaderfx's to overrides, but will be in the future, and matches
constraints and modifiers code.

2 files changed, 14 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_shader_fx.h b/source/blender/blenkernel/BKE_shader_fx.h
index e385f77565b..7e3783a3ee9 100644
--- a/source/blender/blenkernel/BKE_shader_fx.h
+++ b/source/blender/blenkernel/BKE_shader_fx.h
@@ -160,6 +160,8 @@ void BKE_shaderfx_free_ex(struct ShaderFxData *fx, const int flag);
 void BKE_shaderfx_free(struct ShaderFxData *fx);
 bool BKE_shaderfx_unique_name(struct ListBase *shaderfx, struct ShaderFxData *fx);
 bool BKE_shaderfx_depends_ontime(struct ShaderFxData *fx);
+bool BKE_shaderfx_is_nonlocal_in_liboverride(const struct Object *ob,
+                                             const struct ShaderFxData *shaderfx);
 struct ShaderFxData *BKE_shaderfx_findby_type(struct Object *ob, ShaderFxType type);
 struct ShaderFxData *BKE_shaderfx_findby_name(struct Object *ob, const char *name);
 void BKE_shaderfx_copydata_generic(const struct ShaderFxData *fx_src, struct ShaderFxData *fx_dst);
diff --git a/source/blender/blenkernel/intern/shader_fx.c b/source/blender/blenkernel/intern/shader_fx.c
index 3727ec866ca..60f0b744e59 100644
--- a/source/blender/blenkernel/intern/shader_fx.c
+++ b/source/blender/blenkernel/intern/shader_fx.c
@@ -165,6 +165,18 @@ const ShaderFxTypeInfo *BKE_shaderfx_get_info(ShaderFxType type)
 }
 
 /**
+ * Check whether given shaderfx is not local (i.e. from linked data) when the object is a library
+ * override.
+ *
+ * \param shaderfx: May be NULL, in which case we consider it as a non-local shaderfx case.
+ */
+bool BKE_shaderfx_is_nonlocal_in_liboverride(const Object *ob, const ShaderFxData *shaderfx)
+{
+  return (ID_IS_OVERRIDE_LIBRARY(ob) &&
+          ((shaderfx == NULL) || (shaderfx->flag & eShaderFxFlag_OverrideLibrary_Local) == 0));
+}
+
+/**
  * Get an effect's panel type, which was defined in the #panelRegister callback.
  *
  * \note ShaderFx panel types are assumed to be named with the struct name field concatenated to