Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/hydra/volume.cpp

@@ -0,0 +1,92 @@
+/* SPDX-FileCopyrightText: 2022 NVIDIA Corporation
+ * SPDX-FileCopyrightText: 2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#include "hydra/volume.h"
+#include "hydra/field.h"
+#include "hydra/geometry.inl"
+#include "hydra/util.h"
+#include "scene/volume.h"
+
+#include <pxr/imaging/hd/volumeFieldBindingSchema.h>
+
+HDCYCLES_NAMESPACE_OPEN_SCOPE
+
+// clang-format off
+TF_DEFINE_PRIVATE_TOKENS(_tokens,
+   (openvdbAsset)
+);
+// clang-format on
+
+HdCyclesVolume::HdCyclesVolume(const SdfPath &rprimId) : HdCyclesGeometry(rprimId) {}
+
+HdCyclesVolume::~HdCyclesVolume() = default;
+
+HdDirtyBits HdCyclesVolume::GetInitialDirtyBitsMask() const
+{
+  HdDirtyBits bits = HdCyclesGeometry::GetInitialDirtyBitsMask();
+  bits |= HdChangeTracker::DirtyVolumeField;
+  return bits;
+}
+
+void HdCyclesVolume::Populate(HdSceneDelegate *sceneDelegate, HdDirtyBits dirtyBits, bool &rebuild)
+{
+  Scene *const scene = (Scene *)_geom->get_owner();
+
+  if (dirtyBits & HdChangeTracker::DirtyVolumeField) {
+    const HdSceneIndexPrim prim = GetPrim(sceneDelegate, GetId());
+    HdVolumeFieldBindingSchema bindings = HdVolumeFieldBindingSchema::GetFromParent(
+        prim.dataSource);
+
+    for (const TfToken &fieldName : bindings.GetVolumeFieldBindingNames()) {
+      auto pathDs = bindings.GetVolumeFieldBinding(fieldName);
+      if (!pathDs) {
+        continue;
+      }
+      const SdfPath fieldId = pathDs->GetTypedValue(0.0f);
+
+      if (auto *const openvdbAsset = static_cast<HdCyclesField *>(
+              sceneDelegate->GetRenderIndex().GetBprim(_tokens->openvdbAsset, fieldId)))
+      {
+        const ustring name(fieldName.GetString());
+
+        AttributeStandard std = ATTR_STD_NONE;
+        if (name == Attribute::standard_name(ATTR_STD_VOLUME_DENSITY)) {
+          std = ATTR_STD_VOLUME_DENSITY;
+        }
+        else if (name == Attribute::standard_name(ATTR_STD_VOLUME_COLOR)) {
+          std = ATTR_STD_VOLUME_COLOR;
+        }
+        else if (name == Attribute::standard_name(ATTR_STD_VOLUME_FLAME)) {
+          std = ATTR_STD_VOLUME_FLAME;
+        }
+        else if (name == Attribute::standard_name(ATTR_STD_VOLUME_HEAT)) {
+          std = ATTR_STD_VOLUME_HEAT;
+        }
+        else if (name == Attribute::standard_name(ATTR_STD_VOLUME_TEMPERATURE)) {
+          std = ATTR_STD_VOLUME_TEMPERATURE;
+        }
+        else if (name == Attribute::standard_name(ATTR_STD_VOLUME_VELOCITY)) {
+          std = ATTR_STD_VOLUME_VELOCITY;
+        }
+
+        // Skip attributes that are not needed
+        if ((std != ATTR_STD_NONE && _geom->need_attribute(scene, std)) ||
+            _geom->need_attribute(scene, name))
+        {
+          Attribute *const attr = (std != ATTR_STD_NONE) ?
+                                      _geom->attributes.add(std) :
+                                      _geom->attributes.add(name, TypeFloat, ATTR_ELEMENT_VOXEL);
+          attr->data_voxel_for_write() = openvdbAsset->GetImageHandle();
+        }
+      }
+    }
+
+    _geom->merge_grids(scene);
+
+    rebuild = true;
+  }
+}
+
+HDCYCLES_NAMESPACE_CLOSE_SCOPE