OpenSubDiv: add support for an OpenGL evaluator

This evaluator is used in order to evaluate subdivision at render time, allowing for
faster renders of meshes with a subdivision surface modifier placed at the last
position in the modifier list.

When evaluating the subsurf modifier, we detect whether we can delegate evaluation
to the draw code. If so, the subdivision is first evaluated on the GPU using our own
custom evaluator (only the coarse data needs to be initially sent to the GPU), then,
buffers for the final `MeshBufferCache` are filled on the GPU using a set of
compute shaders. However, some buffers are still filled on the CPU side, if doing so
on the GPU is impractical (e.g. the line adjacency buffer used for x-ray, whose
logic is hardly GPU compatible).

This is done at the mesh buffer extraction level so that the result can be readily used
in the various OpenGL engines, without having to write custom geometry or tesselation
shaders.

We use our own subdivision evaluation shaders, instead of OpenSubDiv's vanilla one, in
order to control the data layout, and interpolation. For example, we store vertex colors
as compressed 16-bit integers, while OpenSubDiv's default evaluator only work for float
types.

In order to still access the modified geometry on the CPU side, for use in modifiers
or transform operators, a dedicated wrapper type is added `MESH_WRAPPER_TYPE_SUBD`.
Subdivision will be lazily evaluated via `BKE_object_get_evaluated_mesh` which will
create such a wrapper if possible. If the final subdivision surface is not needed on
the CPU side, `BKE_object_get_evaluated_mesh_no_subsurf` should be used.

Enabling or disabling GPU subdivision can be done through the user preferences (under
Viewport -> Subdivision).

See patch description for benchmarks.

Reviewed By: campbellbarton, jbakker, fclem, brecht, #eevee_viewport

Differential Revision: https://developer.blender.org/D12406

1 files changed, 12 insertions, 12 deletions

diff --git a/source/blender/draw/intern/draw_cache.c b/source/blender/draw/intern/draw_cache.c
index 03fb3b92277..1110658e3b2 100644
--- a/source/blender/draw/intern/draw_cache.c
+++ b/source/blender/draw/intern/draw_cache.c
@@ -923,7 +923,7 @@ GPUBatch *DRW_cache_object_surface_get(Object *ob)
 
 GPUVertBuf *DRW_cache_object_pos_vertbuf_get(Object *ob)
 {
-  Mesh *me = BKE_object_get_evaluated_mesh(ob);
+  Mesh *me = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   short type = (me != NULL) ? OB_MESH : ob->type;
 
   switch (type) {
@@ -950,7 +950,7 @@ int DRW_cache_object_material_count_get(struct Object *ob)
 {
   short type = ob->type;
 
-  Mesh *me = BKE_object_get_evaluated_mesh(ob);
+  Mesh *me = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   if (me != NULL && type != OB_POINTCLOUD) {
     /* Some object types can have one data type in ob->data, but will be rendered as mesh.
      * For point clouds this never happens. Ideally this check would happen at another level
@@ -3021,7 +3021,7 @@ GPUBatch *DRW_cache_surf_surface_get(Object *ob)
   BLI_assert(ob->type == OB_SURF);
 
   struct Curve *cu = ob->data;
-  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh(ob);
+  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   if (mesh_eval != NULL) {
     return DRW_mesh_batch_cache_get_surface(mesh_eval);
   }
@@ -3034,7 +3034,7 @@ GPUBatch *DRW_cache_surf_edge_wire_get(Object *ob)
   BLI_assert(ob->type == OB_SURF);
 
   struct Curve *cu = ob->data;
-  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh(ob);
+  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   if (mesh_eval != NULL) {
     return DRW_mesh_batch_cache_get_loose_edges(mesh_eval);
   }
@@ -3047,7 +3047,7 @@ GPUBatch *DRW_cache_surf_face_wireframe_get(Object *ob)
   BLI_assert(ob->type == OB_SURF);
 
   struct Curve *cu = ob->data;
-  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh(ob);
+  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   if (mesh_eval != NULL) {
     return DRW_mesh_batch_cache_get_wireframes_face(mesh_eval);
   }
@@ -3059,7 +3059,7 @@ GPUBatch *DRW_cache_surf_edge_detection_get(Object *ob, bool *r_is_manifold)
 {
   BLI_assert(ob->type == OB_SURF);
   struct Curve *cu = ob->data;
-  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh(ob);
+  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   if (mesh_eval != NULL) {
     return DRW_mesh_batch_cache_get_edge_detection(mesh_eval, r_is_manifold);
   }
@@ -3072,7 +3072,7 @@ GPUBatch *DRW_cache_surf_loose_edges_get(Object *ob)
   BLI_assert(ob->type == OB_SURF);
 
   struct Curve *cu = ob->data;
-  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh(ob);
+  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   if (mesh_eval != NULL) {
     return DRW_mesh_batch_cache_get_loose_edges(mesh_eval);
   }
@@ -3089,7 +3089,7 @@ GPUBatch **DRW_cache_surf_surface_shaded_get(Object *ob,
   BLI_assert(ob->type == OB_SURF);
 
   struct Curve *cu = ob->data;
-  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh(ob);
+  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   if (mesh_eval != NULL) {
     return DRW_mesh_batch_cache_get_surface_shaded(mesh_eval, gpumat_array, gpumat_array_len);
   }
@@ -3382,7 +3382,7 @@ GPUBatch *DRW_cache_cursor_get(bool crosshair_lines)
 
 void drw_batch_cache_validate(Object *ob)
 {
-  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh(ob);
+  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   switch (ob->type) {
     case OB_MESH:
       DRW_mesh_batch_cache_validate((Mesh *)ob->data);
@@ -3431,7 +3431,7 @@ void drw_batch_cache_generate_requested(Object *ob)
                            DRW_object_use_hide_faces(ob)) ||
                           ((mode == CTX_MODE_EDIT_MESH) && DRW_object_is_in_edit_mode(ob))));
 
-  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh(ob);
+  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   switch (ob->type) {
     case OB_MESH:
       DRW_mesh_batch_cache_create_requested(
@@ -3470,7 +3470,7 @@ void drw_batch_cache_generate_requested_evaluated_mesh(Object *ob)
                            DRW_object_use_hide_faces(ob)) ||
                           ((mode == CTX_MODE_EDIT_MESH) && DRW_object_is_in_edit_mode(ob))));
 
-  Mesh *mesh = BKE_object_get_evaluated_mesh(ob);
+  Mesh *mesh = BKE_object_get_evaluated_mesh_no_subsurf(ob);
   DRW_mesh_batch_cache_create_requested(DST.task_graph, ob, mesh, scene, is_paint_mode, use_hide);
 }
 
@@ -3481,7 +3481,7 @@ void drw_batch_cache_generate_requested_delayed(Object *ob)
 
 void DRW_batch_cache_free_old(Object *ob, int ctime)
 {
-  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh(ob);
+  struct Mesh *mesh_eval = BKE_object_get_evaluated_mesh_no_subsurf(ob);
 
   switch (ob->type) {
     case OB_MESH: