3 files changed, 19 insertions, 1 deletions
diff --git a/source/blender/makesdna/DNA_mesh_types.h b/source/blender/makesdna/DNA_mesh_types.h
index c053baf9f7e..94e88bdaca6 100644
--- a/source/blender/makesdna/DNA_mesh_types.h
+++ b/source/blender/makesdna/DNA_mesh_types.h
@@ -138,6 +138,15 @@ typedef struct Mesh_Runtime {
   int64_t cd_dirty_loop;
   int64_t cd_dirty_poly;
 
+  /**
+   * Settings for lazily evaluating the subdivision on the CPU if needed. These are
+   * set in the modifier when GPU subdivision can be performed.
+   */
+  char subsurf_apply_render;
+  char subsurf_use_optimal_display;
+  char _pad[2];
+  int subsurf_resolution;
+
 } Mesh_Runtime;
 
 typedef struct Mesh {
@@ -356,7 +365,8 @@ typedef enum eMeshWrapperType {
   ME_WRAPPER_TYPE_MDATA = 0,
   /** Use edit-mesh data (#Mesh.edit_mesh, #Mesh_Runtime.edit_data). */
   ME_WRAPPER_TYPE_BMESH = 1,
-  /* ME_WRAPPER_TYPE_SUBD = 2, */ /* TODO */
+  /** Use subdivision mesh data (#Mesh_Runtime.mesh_eval). */
+  ME_WRAPPER_TYPE_SUBD = 2,
 } eMeshWrapperType;
 
 /** #Mesh.texflag */
diff --git a/source/blender/makesdna/DNA_modifier_types.h b/source/blender/makesdna/DNA_modifier_types.h
index 85cc1361adf..fc041e257b0 100644
--- a/source/blender/makesdna/DNA_modifier_types.h
+++ b/source/blender/makesdna/DNA_modifier_types.h
@@ -196,6 +196,13 @@ typedef enum {
   SUBSURF_BOUNDARY_SMOOTH_PRESERVE_CORNERS = 1,
 } eSubsurfBoundarySmooth;
 
+typedef struct SubsurfRuntimeData {
+  /* Cached subdivision surface descriptor, with topology and settings. */
+  struct Subdiv *subdiv;
+  char set_by_draw_code;
+  char _pad[7];
+} SubsurfRuntimeData;
+
 typedef struct SubsurfModifierData {
   ModifierData modifier;
 
diff --git a/source/blender/makesdna/DNA_userdef_types.h b/source/blender/makesdna/DNA_userdef_types.h
index c99651f0717..34415308ef6 100644
--- a/source/blender/makesdna/DNA_userdef_types.h
+++ b/source/blender/makesdna/DNA_userdef_types.h
@@ -1145,6 +1145,7 @@ typedef enum eUserpref_GPU_Flag {
   USER_GPU_FLAG_NO_DEPT_PICK = (1 << 0),
   USER_GPU_FLAG_NO_EDIT_MODE_SMOOTH_WIRE = (1 << 1),
   USER_GPU_FLAG_OVERLAY_SMOOTH_WIRE = (1 << 2),
+  USER_GPU_FLAG_SUBDIVISION_EVALUATION = (1 << 3),
 } eUserpref_GPU_Flag;
 
 /** #UserDef.tablet_api */