Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/bvh/binning.h

@@ -0,0 +1,98 @@
+/* SPDX-FileCopyrightText: 2009-2011 Intel Corporation
+ * SPDX-FileCopyrightText: 2012-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Adapted code from Intel Corporation. */
+
+#pragma once
+
+#include "bvh/params.h"
+#include "bvh/unaligned.h"
+
+#include "util/types.h"
+
+CCL_NAMESPACE_BEGIN
+
+class BVHBuild;
+
+/* Single threaded object binner. Finds the split with the best SAH heuristic
+ * by testing for each dimension multiple partitionings for regular spaced
+ * partition locations. A partitioning for a partition location is computed,
+ * by putting primitives whose centroid is on the left and right of the split
+ * location to different sets. The SAH is evaluated by computing the number of
+ * blocks occupied by the primitives in the partitions. */
+
+class BVHObjectBinning : public BVHRange {
+ public:
+  __forceinline BVHObjectBinning() : leafSAH(FLT_MAX) {}
+
+  BVHObjectBinning(const BVHRange &job,
+                   BVHReference *prims,
+                   const BVHUnaligned *unaligned_heuristic = nullptr,
+                   const Transform *aligned_space = nullptr);
+
+  void split(BVHReference *prims, BVHObjectBinning &left_o, BVHObjectBinning &right_o) const;
+
+  __forceinline const BoundBox &unaligned_bounds()
+  {
+    return bounds_;
+  }
+
+  float splitSAH; /* SAH cost of the best split */
+  float leafSAH;  /* SAH cost of creating a leaf */
+
+ protected:
+  int dim;         /* best split dimension */
+  int pos;         /* best split position */
+  size_t num_bins; /* actual number of bins to use */
+  float3 scale;    /* scaling factor to compute bin */
+
+  /* Effective bounds and centroid bounds. */
+  BoundBox bounds_;
+  BoundBox cent_bounds_;
+
+  const BVHUnaligned *unaligned_heuristic_;
+  const Transform *aligned_space_;
+
+  enum { MAX_BINS = 32 };
+  enum { LOG_BLOCK_SIZE = 2 };
+
+  /* computes the bin numbers for each dimension for a box. */
+  __forceinline int4 get_bin(const BoundBox &box) const
+  {
+    const int4 a = make_int4((box.center2() - cent_bounds_.min) * scale - make_float3(0.5f));
+    const int4 mn = make_int4(0);
+    const int4 mx = make_int4((int)num_bins - 1);
+
+    return clamp(a, mn, mx);
+  }
+
+  /* computes the bin numbers for each dimension for a point. */
+  __forceinline int4 get_bin(const float3 &c) const
+  {
+    return make_int4((c - cent_bounds_.min) * scale - make_float3(0.5f));
+  }
+
+  /* compute the number of blocks occupied for each dimension. */
+  __forceinline float4 blocks(const int4 &a) const
+  {
+    return make_float4((a + make_int4((1 << LOG_BLOCK_SIZE) - 1)) >> LOG_BLOCK_SIZE);
+  }
+
+  /* compute the number of blocks occupied in one dimension. */
+  __forceinline int blocks(const size_t a) const
+  {
+    return (int)((a + ((1LL << LOG_BLOCK_SIZE) - 1)) >> LOG_BLOCK_SIZE);
+  }
+
+  __forceinline BoundBox get_prim_bounds(const BVHReference &prim) const
+  {
+    if (aligned_space_ == nullptr) {
+      return prim.bounds();
+    }
+    return unaligned_heuristic_->compute_aligned_prim_boundbox(prim, *aligned_space_);
+  }
+};
+
+CCL_NAMESPACE_END