1 files changed, 59 insertions, 0 deletions
diff --git a/source/blender/draw/intern/draw_handle.hh b/source/blender/draw/intern/draw_handle.hh
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index 00000000000..5f96bfa5dcd
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+++ b/source/blender/draw/intern/draw_handle.hh
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+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2022 Blender Foundation. */
+
+#pragma once
+
+/** \file
+ * \ingroup draw
+ *
+ * A unique identifier for each object component.
+ * It is used to access each component data such as matrices and object attributes.
+ * It is valid only for the current draw, it is not persistent.
+ *
+ * The most significant bit is used to encode if the object needs to invert the front face winding
+ * because of its object matrix handedness. This is handy because this means sorting inside
+ * #DrawGroup command will put all inverted commands last.
+ *
+ * Default value of 0 points toward an non-cull-able object with unit bounding box centered at
+ * the origin.
+ */
+
+#include "draw_shader_shared.h"
+
+struct Object;
+struct DupliObject;
+
+namespace blender::draw {
+
+struct ResourceHandle {
+  uint raw;
+
+  ResourceHandle() = default;
+  ResourceHandle(uint raw_) : raw(raw_){};
+  ResourceHandle(uint index, bool inverted_handedness)
+  {
+    raw = index;
+    SET_FLAG_FROM_TEST(raw, inverted_handedness, 0x80000000u);
+  }
+
+  bool has_inverted_handedness() const
+  {
+    return (raw & 0x80000000u) != 0;
+  }
+
+  uint resource_index() const
+  {
+    return (raw & 0x7FFFFFFFu);
+  }
+};
+
+/* TODO(fclem): Move to somewhere more appropriated after cleaning up the header dependencies. */
+struct ObjectRef {
+  Object *object;
+  /** Dupli object that corresponds to the current object. */
+  DupliObject *dupli_object;
+  /** Object that created the dupli-list the current object is part of. */
+  Object *dupli_parent;
+};
+
+};  // namespace blender::draw