From aa09a46fd736061668746e027877b512cc124950 Mon Sep 17 00:00:00 2001
From: Brecht Van Lommel <brecht>
Date: Tue, 21 Apr 2020 13:09:41 +0200
Subject: Objects: add infrastructure for hair, pointcloud, volume modifiers

There is no user visible difference in standard builds, as there are no
volume modifiers yet. When using WITH_NEW_OBJECT_TYPES some deform only
modifiers are now available for hair and pointcloud objects.

Differential Revision: https://developer.blender.org/D7141
---
 source/blender/blenkernel/intern/pointcloud.c | 61 +++++++++++++++++++++++++--
 1 file changed, 57 insertions(+), 4 deletions(-)

(limited to 'source/blender/blenkernel/intern/pointcloud.c')

diff --git a/source/blender/blenkernel/intern/pointcloud.c b/source/blender/blenkernel/intern/pointcloud.c
index 717d84c1c1e..c943d30aaa5 100644
--- a/source/blender/blenkernel/intern/pointcloud.c
+++ b/source/blender/blenkernel/intern/pointcloud.c
@@ -211,12 +211,65 @@ PointCloud *BKE_pointcloud_copy_for_eval(struct PointCloud *pointcloud_src, bool
   return result;
 }
 
-static PointCloud *pointcloud_evaluate_modifiers(struct Depsgraph *UNUSED(depsgraph),
-                                                 struct Scene *UNUSED(scene),
-                                                 Object *UNUSED(object),
+static PointCloud *pointcloud_evaluate_modifiers(struct Depsgraph *depsgraph,
+                                                 struct Scene *scene,
+                                                 Object *object,
                                                  PointCloud *pointcloud_input)
 {
-  return pointcloud_input;
+  PointCloud *pointcloud = pointcloud_input;
+
+  /* Modifier evaluation modes. */
+  const bool use_render = (DEG_get_mode(depsgraph) == DAG_EVAL_RENDER);
+  const int required_mode = use_render ? eModifierMode_Render : eModifierMode_Realtime;
+  ModifierApplyFlag apply_flag = use_render ? MOD_APPLY_RENDER : MOD_APPLY_USECACHE;
+  const ModifierEvalContext mectx = {depsgraph, object, apply_flag};
+
+  /* Get effective list of modifiers to execute. Some effects like shape keys
+   * are added as virtual modifiers before the user created modifiers. */
+  VirtualModifierData virtualModifierData;
+  ModifierData *md = modifiers_getVirtualModifierList(object, &virtualModifierData);
+
+  /* Evaluate modifiers. */
+  for (; md; md = md->next) {
+    const ModifierTypeInfo *mti = modifierType_getInfo(md->type);
+
+    if (!modifier_isEnabled(scene, md, required_mode)) {
+      continue;
+    }
+
+    if ((mti->type == eModifierTypeType_OnlyDeform) &&
+        (mti->flags & eModifierTypeFlag_AcceptsVertexCosOnly)) {
+      /* Ensure we are not modifying the input. */
+      if (pointcloud == pointcloud_input) {
+        pointcloud = BKE_pointcloud_copy_for_eval(pointcloud, true);
+      }
+
+      /* Ensure we are not overwriting referenced data. */
+      CustomData_duplicate_referenced_layer(&pointcloud->pdata, CD_LOCATION, pointcloud->totpoint);
+      BKE_pointcloud_update_customdata_pointers(pointcloud);
+
+      /* Created deformed coordinates array on demand. */
+      mti->deformVerts(md, &mectx, NULL, pointcloud->co, pointcloud->totpoint);
+    }
+    else if (mti->modifyPointCloud) {
+      /* Ensure we are not modifying the input. */
+      if (pointcloud == pointcloud_input) {
+        pointcloud = BKE_pointcloud_copy_for_eval(pointcloud, true);
+      }
+
+      PointCloud *pointcloud_next = mti->modifyPointCloud(md, &mectx, pointcloud);
+
+      if (pointcloud_next && pointcloud_next != pointcloud) {
+        /* If the modifier returned a new pointcloud, release the old one. */
+        if (pointcloud != pointcloud_input) {
+          BKE_id_free(NULL, pointcloud);
+        }
+        pointcloud = pointcloud_next;
+      }
+    }
+  }
+
+  return pointcloud;
 }
 
 void BKE_pointcloud_data_update(struct Depsgraph *depsgraph, struct Scene *scene, Object *object)
-- 
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