From f5d911f8b0deb28d04737451adf355da80c792c3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sybren=20A=2E=20St=C3=BCvel?= <sybren@stuvel.eu>
Date: Fri, 18 May 2018 17:32:22 +0200
Subject: =?UTF-8?q?Modifiers:=20ported=20Cloth=20DerivedMesh=20=E2=86=92?=
 =?UTF-8?q?=20Mesh?=
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The modifier is still quite slow; this could be due to caches being written
to a CoW datablock instead of the original one. More investigation is
needed.
---
 source/blender/modifiers/intern/MOD_cloth.c | 42 ++++++++++++++++++-----------
 1 file changed, 27 insertions(+), 15 deletions(-)

(limited to 'source/blender/modifiers/intern/MOD_cloth.c')

diff --git a/source/blender/modifiers/intern/MOD_cloth.c b/source/blender/modifiers/intern/MOD_cloth.c
index 268b0b22050..33d608aa868 100644
--- a/source/blender/modifiers/intern/MOD_cloth.c
+++ b/source/blender/modifiers/intern/MOD_cloth.c
@@ -36,6 +36,7 @@
 
 #include "DNA_cloth_types.h"
 #include "DNA_key_types.h"
+#include "DNA_mesh_types.h"
 #include "DNA_scene_types.h"
 #include "DNA_object_types.h"
 
@@ -44,11 +45,12 @@
 #include "BLI_utildefines.h"
 
 #include "BKE_cloth.h"
-#include "BKE_cdderivedmesh.h"
 #include "BKE_effect.h"
 #include "BKE_global.h"
 #include "BKE_key.h"
+#include "BKE_library.h"
 #include "BKE_library_query.h"
+#include "BKE_mesh.h"
 #include "BKE_modifier.h"
 #include "BKE_pointcache.h"
 
@@ -71,10 +73,10 @@ static void initData(ModifierData *md)
 
 static void deformVerts(
         ModifierData *md, const ModifierEvalContext *ctx,
-        DerivedMesh *derivedData, float (*vertexCos)[3],
+        Mesh *mesh, float (*vertexCos)[3],
         int numVerts)
 {
-	DerivedMesh *dm;
+	Mesh *mesh_src;
 	ClothModifierData *clmd = (ClothModifierData *) md;
 	
 	/* check for alloc failing */
@@ -85,9 +87,20 @@ static void deformVerts(
 			return;
 	}
 
-	dm = get_dm(ctx->object, NULL, derivedData, NULL, false, false);
-	if (dm == derivedData)
-		dm = CDDM_copy(dm);
+	if (mesh == NULL) {
+		mesh_src = get_mesh(ctx->object, NULL, NULL, NULL, false, false);
+	}
+	else {
+		/* Not possible to use get_mesh() in this case as we'll modify its vertices
+		 * and get_mesh() would return 'mesh' directly. */
+		BKE_id_copy_ex(
+		        NULL, (ID *)mesh, (ID **)&mesh_src,
+		        LIB_ID_CREATE_NO_MAIN |
+		        LIB_ID_CREATE_NO_USER_REFCOUNT |
+		        LIB_ID_CREATE_NO_DEG_TAG |
+		        LIB_ID_COPY_NO_PREVIEW,
+		        false);
+	}
 
 	/* TODO(sergey): For now it actually duplicates logic from DerivedMesh.c
 	 * and needs some more generic solution. But starting experimenting with
@@ -95,25 +108,24 @@ static void deformVerts(
 	 *
 	 * Also hopefully new cloth system will arrive soon..
 	 */
-	if (derivedData == NULL && clmd->sim_parms->shapekey_rest) {
+	if (mesh == NULL && clmd->sim_parms->shapekey_rest) {
 		KeyBlock *kb = BKE_keyblock_from_key(BKE_key_from_object(ctx->object),
 		                                     clmd->sim_parms->shapekey_rest);
 		if (kb && kb->data != NULL) {
 			float (*layerorco)[3];
-			if (!(layerorco = DM_get_vert_data_layer(dm, CD_CLOTH_ORCO))) {
-				DM_add_vert_layer(dm, CD_CLOTH_ORCO, CD_CALLOC, NULL);
-				layerorco = DM_get_vert_data_layer(dm, CD_CLOTH_ORCO);
+			if (!(layerorco = CustomData_get_layer(&mesh_src->vdata, CD_CLOTH_ORCO))) {
+				layerorco = CustomData_add_layer(&mesh_src->vdata, CD_CLOTH_ORCO, CD_CALLOC, NULL, mesh_src->totvert);
 			}
 
 			memcpy(layerorco, kb->data, sizeof(float) * 3 * numVerts);
 		}
 	}
 
-	CDDM_apply_vert_coords(dm, vertexCos);
+	BKE_mesh_apply_vert_coords(mesh_src, vertexCos);
 
-	clothModifier_do(clmd, ctx->depsgraph, md->scene, ctx->object, dm, vertexCos);
+	clothModifier_do(clmd, ctx->depsgraph, md->scene, ctx->object, mesh_src, vertexCos);
 
-	dm->release(dm);
+	BKE_id_free(NULL, mesh_src);
 }
 
 static void updateDepsgraph(ModifierData *md, const ModifierUpdateDepsgraphContext *ctx)
@@ -229,14 +241,14 @@ ModifierTypeInfo modifierType_Cloth = {
 
 	/* copyData */          copyData,
 
-	/* deformVerts_DM */    deformVerts,
+	/* deformVerts_DM */    NULL,
 	/* deformMatrices_DM */ NULL,
 	/* deformVertsEM_DM */  NULL,
 	/* deformMatricesEM_DM*/NULL,
 	/* applyModifier_DM */  NULL,
 	/* applyModifierEM_DM */NULL,
 
-	/* deformVerts */       NULL,
+	/* deformVerts */       deformVerts,
 	/* deformMatrices */    NULL,
 	/* deformVertsEM */     NULL,
 	/* deformMatricesEM */  NULL,
-- 
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