Subsurf: Remove OpenSubdiv options from modifier

There are following reasons to do so:

- The plan is to replace it with some sort of object or viewport option,
  so we can apply OpenSubdiv subdivisions on top of modifier stack and
  keep modifier stack purely CPU side.

  This will solve issues when adding some relation in scene will force
  modifier to be evaluated on CPU.

- With new upcoming OpenSubdiv based CPU modifier implementation we can
  cache topology similar to what GPU side was doing, which will already
  be reasonably faster.

- OpenSubdiv GPU does not work since the OpenGL version bump, and is
  to be rewritten with all the adaptive refine options kept in mind.

Since OpenSubdiv GPU was already broken and was only causing object
to become invisible, there is no reason to keep having that option in
the modifier.

Reviewers: brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D3598

4 files changed, 2 insertions, 104 deletions

diff --git a/source/blender/blenkernel/intern/DerivedMesh.c b/source/blender/blenkernel/intern/DerivedMesh.c
index 05253f7962a..6fba5ec4eee 100644
--- a/source/blender/blenkernel/intern/DerivedMesh.c
+++ b/source/blender/blenkernel/intern/DerivedMesh.c
@@ -2857,39 +2857,6 @@ static void editbmesh_calc_modifiers(
 		MEM_freeN(deformedVerts);
 }
 
-#ifdef WITH_OPENSUBDIV
-/* The idea is to skip CPU-side ORCO calculation when
- * we'll be using GPU backend of OpenSubdiv. This is so
- * playback performance is kept as high as possible.
- */
-static bool calc_modifiers_skip_orco(Depsgraph *depsgraph,
-                                     Scene *scene,
-                                     Object *ob,
-                                     bool use_render_params)
-{
-	ModifierData *last_md = ob->modifiers.last;
-	const int required_mode = use_render_params ? eModifierMode_Render : eModifierMode_Realtime;
-	if (last_md != NULL &&
-	    last_md->type == eModifierType_Subsurf &&
-	    modifier_isEnabled(scene, last_md, required_mode))
-	{
-		if (U.opensubdiv_compute_type == USER_OPENSUBDIV_COMPUTE_NONE) {
-			return false;
-		}
-		else if ((ob->mode & (OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT | OB_MODE_TEXTURE_PAINT)) != 0) {
-			return false;
-		}
-		else if ((DEG_get_eval_flags_for_id(depsgraph, &ob->id) & DAG_EVAL_NEED_CPU) != 0) {
-			return false;
-		}
-		SubsurfModifierData *smd = (SubsurfModifierData *)last_md;
-		/* TODO(sergey): Deduplicate this with checks from subsurf_ccg.c. */
-		return smd->use_opensubdiv != 0;
-	}
-	return false;
-}
-#endif
-
 static void mesh_finalize_eval(Object *object)
 {
 	Mesh *mesh = (Mesh *)object->data;
@@ -2941,12 +2908,6 @@ static void mesh_build_data(
 	BKE_object_free_derived_caches(ob);
 	BKE_object_sculpt_modifiers_changed(ob);
 
-#ifdef WITH_OPENSUBDIV
-	if (calc_modifiers_skip_orco(depsgraph, scene, ob, false)) {
-		dataMask &= ~(CD_MASK_ORCO | CD_MASK_PREVIEW_MCOL);
-	}
-#endif
-
 	mesh_calc_modifiers(
 	        depsgraph, scene, ob, NULL, 1, need_mapping, dataMask, -1, true, build_shapekey_layers,
 	        true,
@@ -2988,12 +2949,6 @@ static void editbmesh_build_data(
 
 	BKE_editmesh_free_derivedmesh(em);
 
-#ifdef WITH_OPENSUBDIV
-	if (calc_modifiers_skip_orco(depsgraph, scene, obedit, false)) {
-		dataMask &= ~(CD_MASK_ORCO | CD_MASK_PREVIEW_MCOL);
-	}
-#endif
-
 	editbmesh_calc_modifiers(
 	        depsgraph, scene, obedit, em, dataMask,
 	        &em->derivedCage, &em->derivedFinal);
diff --git a/source/blender/makesdna/DNA_modifier_types.h b/source/blender/makesdna/DNA_modifier_types.h
index c53b8e3a5e2..87e632defe1 100644
--- a/source/blender/makesdna/DNA_modifier_types.h
+++ b/source/blender/makesdna/DNA_modifier_types.h
@@ -162,8 +162,7 @@ typedef struct SubsurfModifierData {
 
 	short subdivType, levels, renderLevels, flags;
 	short uv_smooth;
-	short use_opensubdiv;
-	short pad[2];
+	short pad[3];
 
 	void *emCache, *mCache;
 } SubsurfModifierData;
diff --git a/source/blender/makesrna/intern/rna_modifier.c b/source/blender/makesrna/intern/rna_modifier.c
index 8fbd906766e..eeeee5d4c9a 100644
--- a/source/blender/makesrna/intern/rna_modifier.c
+++ b/source/blender/makesrna/intern/rna_modifier.c
@@ -1249,13 +1249,6 @@ static void rna_def_modifier_subsurf(BlenderRNA *brna)
 	RNA_def_property_enum_items(prop, prop_uv_smooth_items);
 	RNA_def_property_ui_text(prop, "UV Smooth", "Controls how smoothing is applied to UVs");
 	RNA_def_property_update(prop, 0, "rna_Modifier_update");
-
-#ifdef WITH_OPENSUBDIV
-	prop = RNA_def_property(srna, "use_opensubdiv", PROP_BOOLEAN, PROP_NONE);
-	RNA_def_property_boolean_sdna(prop, NULL, "use_opensubdiv", 1);
-	RNA_def_property_ui_text(prop, "Use OpenSubdiv", "Use OpenSubdiv for the subdivisions (viewport only)");
-	RNA_def_property_update(prop, 0, "rna_Modifier_update");
-#endif
 }
 
 static void rna_def_modifier_generic_map_info(StructRNA *srna)
diff --git a/source/blender/modifiers/intern/MOD_subsurf.c b/source/blender/modifiers/intern/MOD_subsurf.c
index 82e2d8bfe8d..58cdea0df10 100644
--- a/source/blender/modifiers/intern/MOD_subsurf.c
+++ b/source/blender/modifiers/intern/MOD_subsurf.c
@@ -113,9 +113,6 @@ static DerivedMesh *applyModifier(
 	const bool useRenderParams = (ctx->flag & MOD_APPLY_RENDER) != 0;
 	const bool isFinalCalc = (ctx->flag & MOD_APPLY_USECACHE) != 0;
 
-#ifdef WITH_OPENSUBDIV
-	const bool allow_gpu = (ctx->flag & MOD_APPLY_ALLOW_GPU) != 0;
-#endif
 	bool do_cddm_convert = useRenderParams || !isFinalCalc;
 
 	if (useRenderParams)
@@ -125,31 +122,6 @@ static DerivedMesh *applyModifier(
 	if (ctx->object->mode & OB_MODE_EDIT)
 		subsurf_flags |= SUBSURF_IN_EDIT_MODE;
 
-#ifdef WITH_OPENSUBDIV
-	/* TODO(sergey): Not entirely correct, modifiers on top of subsurf
-	 * could be disabled.
-	 */
-	if (md->next == NULL &&
-	    allow_gpu &&
-	    do_cddm_convert == false &&
-	    smd->use_opensubdiv)
-	{
-		if (U.opensubdiv_compute_type == USER_OPENSUBDIV_COMPUTE_NONE) {
-			modifier_setError(md, "OpenSubdiv is disabled in User Preferences");
-		}
-		else if ((ctx->object->mode & (OB_MODE_VERTEX_PAINT | OB_MODE_WEIGHT_PAINT | OB_MODE_TEXTURE_PAINT)) != 0) {
-			modifier_setError(md, "OpenSubdiv is not supported in paint modes");
-		}
-		else if ((DEG_get_eval_flags_for_id(ctx->depsgraph, &ctx->object->id) & DAG_EVAL_NEED_CPU) == 0) {
-			subsurf_flags |= SUBSURF_USE_GPU_BACKEND;
-			do_cddm_convert = false;
-		}
-		else {
-			modifier_setError(md, "OpenSubdiv is disabled due to dependencies");
-		}
-	}
-#endif
-
 	result = subsurf_make_derived_from_derived(derivedData, smd, scene, NULL, subsurf_flags);
 	result->cd_flag = derivedData->cd_flag;
 
@@ -159,9 +131,7 @@ static DerivedMesh *applyModifier(
 		result = cddm;
 	}
 
-#ifndef WITH_OPESUBDIV
 	(void) do_cddm_convert;
-#endif
 
 	return result;
 }
@@ -176,12 +146,6 @@ static DerivedMesh *applyModifierEM(
 	DerivedMesh *result;
 	/* 'orco' using editmode flags would cause cache to be used twice in editbmesh_calc_modifiers */
 	SubsurfFlags ss_flags = (ctx->flag & MOD_APPLY_ORCO) ? 0 : (SUBSURF_FOR_EDIT_MODE | SUBSURF_IN_EDIT_MODE);
-#ifdef WITH_OPENSUBDIV
-	const bool allow_gpu = (ctx->flag & MOD_APPLY_ALLOW_GPU) != 0;
-	if (md->next == NULL && allow_gpu && smd->use_opensubdiv) {
-		modifier_setError(md, "OpenSubdiv is not supported in edit mode");
-	}
-#endif
 
 	result = subsurf_make_derived_from_derived(derivedData, smd, scene, NULL, ss_flags);
 	return result;
@@ -271,19 +235,6 @@ static Mesh *applyModifier_subdiv(ModifierData *md,
 }
 #endif
 
-static bool dependsOnNormals(ModifierData *md)
-{
-#ifdef WITH_OPENSUBDIV
-	SubsurfModifierData *smd = (SubsurfModifierData *) md;
-	if (smd->use_opensubdiv && md->next == NULL) {
-		return true;
-	}
-#else
-	UNUSED_VARS(md);
-#endif
-	return false;
-}
-
 ModifierTypeInfo modifierType_Subsurf = {
 	/* name */              "Subsurf",
 	/* structName */        "SubsurfModifierData",
@@ -321,7 +272,7 @@ ModifierTypeInfo modifierType_Subsurf = {
 	/* isDisabled */        isDisabled,
 	/* updateDepsgraph */   NULL,
 	/* dependsOnTime */     NULL,
-	/* dependsOnNormals */	dependsOnNormals,
+	/* dependsOnNormals */	NULL,
 	/* foreachObjectLink */ NULL,
 	/* foreachIDLink */     NULL,
 	/* foreachTexLink */    NULL,