Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/bvh/unaligned.cpp

@@ -0,0 +1,152 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#include "bvh/unaligned.h"
+
+#include "scene/hair.h"
+#include "scene/object.h"
+
+#include "bvh/binning.h"
+#include "bvh/params.h"
+
+#include "util/boundbox.h"
+#include "util/transform.h"
+
+CCL_NAMESPACE_BEGIN
+
+BVHUnaligned::BVHUnaligned(const vector<Object *> &objects) : objects_(objects) {}
+
+Transform BVHUnaligned::compute_aligned_space(const BVHObjectBinning &range,
+                                              const BVHReference *references) const
+{
+  for (int i = range.start(); i < range.end(); ++i) {
+    const BVHReference &ref = references[i];
+    Transform aligned_space;
+    /* Use first primitive which defines correct direction to define
+     * the orientation space.
+     */
+    if (compute_aligned_space(ref, &aligned_space)) {
+      return aligned_space;
+    }
+  }
+  return transform_identity();
+}
+
+Transform BVHUnaligned::compute_aligned_space(const BVHRange &range,
+                                              const BVHReference *references) const
+{
+  for (int i = range.start(); i < range.end(); ++i) {
+    const BVHReference &ref = references[i];
+    Transform aligned_space;
+    /* Use first primitive which defines correct direction to define
+     * the orientation space.
+     */
+    if (compute_aligned_space(ref, &aligned_space)) {
+      return aligned_space;
+    }
+  }
+  return transform_identity();
+}
+
+bool BVHUnaligned::compute_aligned_space(const BVHReference &ref, Transform *aligned_space) const
+{
+  const Object *object = objects_[ref.prim_object()];
+  const int packed_type = ref.prim_type();
+  const int type = (packed_type & PRIMITIVE_ALL);
+  /* No motion blur curves here, we can't fit them to aligned boxes well. */
+  if ((type & PRIMITIVE_CURVE) && !(type & PRIMITIVE_MOTION)) {
+    const int curve_index = ref.prim_index();
+    const int segment = PRIMITIVE_UNPACK_SEGMENT(packed_type);
+    const Hair *hair = static_cast<const Hair *>(object->get_geometry());
+    const Hair::Curve &curve = hair->get_curve(curve_index);
+    const int key = curve.first_key + segment;
+    const packed_float3 *curve_keys = hair->get_position();
+    const float3 v1 = curve_keys[key];
+    const float3 v2 = curve_keys[key + 1];
+    float length;
+    const float3 axis = normalize_len(v2 - v1, &length);
+    if (length > 1e-6f) {
+      *aligned_space = make_transform_frame(axis);
+      return true;
+    }
+  }
+  *aligned_space = transform_identity();
+  return false;
+}
+
+BoundBox BVHUnaligned::compute_aligned_prim_boundbox(const BVHReference &prim,
+                                                     const Transform &aligned_space) const
+{
+  BoundBox bounds = BoundBox::empty;
+  const Object *object = objects_[prim.prim_object()];
+  const int packed_type = prim.prim_type();
+  const int type = (packed_type & PRIMITIVE_ALL);
+  /* No motion blur curves here, we can't fit them to aligned boxes well. */
+  if ((type & PRIMITIVE_CURVE) && !(type & PRIMITIVE_MOTION)) {
+    const int curve_index = prim.prim_index();
+    const int segment = PRIMITIVE_UNPACK_SEGMENT(packed_type);
+    const Hair *hair = static_cast<const Hair *>(object->get_geometry());
+    const Hair::Curve &curve = hair->get_curve(curve_index);
+    curve.bounds_grow(segment, hair->get_position(), hair->get_radius(), aligned_space, bounds);
+  }
+  else {
+    bounds = prim.bounds().transformed(&aligned_space);
+  }
+  return bounds;
+}
+
+BoundBox BVHUnaligned::compute_aligned_boundbox(const BVHObjectBinning &range,
+                                                const BVHReference *references,
+                                                const Transform &aligned_space,
+                                                BoundBox *cent_bounds) const
+{
+  BoundBox bounds = BoundBox::empty;
+  if (cent_bounds != nullptr) {
+    *cent_bounds = BoundBox::empty;
+  }
+  for (int i = range.start(); i < range.end(); ++i) {
+    const BVHReference &ref = references[i];
+    const BoundBox ref_bounds = compute_aligned_prim_boundbox(ref, aligned_space);
+    bounds.grow(ref_bounds);
+    if (cent_bounds != nullptr) {
+      cent_bounds->grow(ref_bounds.center2());
+    }
+  }
+  return bounds;
+}
+
+BoundBox BVHUnaligned::compute_aligned_boundbox(const BVHRange &range,
+                                                const BVHReference *references,
+                                                const Transform &aligned_space,
+                                                BoundBox *cent_bounds) const
+{
+  BoundBox bounds = BoundBox::empty;
+  if (cent_bounds != nullptr) {
+    *cent_bounds = BoundBox::empty;
+  }
+  for (int i = range.start(); i < range.end(); ++i) {
+    const BVHReference &ref = references[i];
+    const BoundBox ref_bounds = compute_aligned_prim_boundbox(ref, aligned_space);
+    bounds.grow(ref_bounds);
+    if (cent_bounds != nullptr) {
+      cent_bounds->grow(ref_bounds.center2());
+    }
+  }
+  return bounds;
+}
+
+Transform BVHUnaligned::compute_node_transform(const BoundBox &bounds,
+                                               const Transform &aligned_space)
+{
+  Transform space = aligned_space;
+  space.x.w -= bounds.min.x;
+  space.y.w -= bounds.min.y;
+  space.z.w -= bounds.min.z;
+  const float3 dim = bounds.max - bounds.min;
+  return transform_scale(
+             1.0f / max(1e-18f, dim.x), 1.0f / max(1e-18f, dim.y), 1.0f / max(1e-18f, dim.z)) *
+         space;
+}
+
+CCL_NAMESPACE_END