Add Chromium-only Blender WebEngine parity work

blender-5.2.0/source/blender/draw/DRW_pbvh.hh

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+/* SPDX-FileCopyrightText: 2022 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup draw
+ */
+
+#pragma once
+
+#include <variant>
+
+#include "BLI_index_mask_fwd.hh"
+#include "BLI_string_ref.hh"
+#include "BLI_vector.hh"
+
+#include "BKE_paint_bvh.hh"
+
+#include "DNA_customdata_types.h"
+
+namespace blender {
+
+namespace gpu {
+class Batch;
+class IndexBuf;
+class VertBuf;
+}  // namespace gpu
+struct Object;
+namespace bke {
+enum class AttrDomain : int8_t;
+namespace pbvh {
+class Node;
+class DrawCache;
+class Tree;
+}  // namespace pbvh
+}  // namespace bke
+
+namespace draw::pbvh {
+
+using GenericRequest = std::string;
+
+enum class CustomRequest : int8_t {
+  Position,
+  Normal,
+  Mask,
+  FaceSet,
+};
+
+using AttributeRequest = std::variant<CustomRequest, GenericRequest>;
+
+struct ViewportRequest {
+  Vector<AttributeRequest> attributes;
+  bool use_coarse_grids;
+  friend bool operator==(const ViewportRequest &a, const ViewportRequest &b) = default;
+  uint64_t hash() const;
+};
+
+class DrawCache : public bke::pbvh::DrawCache {
+ public:
+  ~DrawCache() override = default;
+  /**
+   * Recalculate and copy data as necessary to prepare batches for drawing triangles for a
+   * specific combination of attributes.
+   */
+  virtual Span<gpu::Batch *> ensure_tris_batches(const Object &object,
+                                                 const ViewportRequest &request,
+                                                 const IndexMask &nodes_to_update) = 0;
+  /**
+   * Recalculate and copy data as necessary to prepare batches for drawing wireframe geometry for a
+   * specific combination of attributes.
+   */
+  virtual Span<gpu::Batch *> ensure_lines_batches(const Object &object,
+                                                  const ViewportRequest &request,
+                                                  const IndexMask &nodes_to_update) = 0;
+
+  /**
+   * Return the material index for each node (all faces in a node should have the same material
+   * index, as ensured by the BVH building process).
+   */
+  virtual Span<int> ensure_material_indices(const Object &object) = 0;
+};
+
+DrawCache &ensure_draw_data(std::unique_ptr<bke::pbvh::DrawCache> &ptr);
+
+}  // namespace draw::pbvh
+}  // namespace blender