1 files changed, 68 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee_next/eevee_cryptomatte.hh b/source/blender/draw/engines/eevee_next/eevee_cryptomatte.hh
new file mode 100644
index 00000000000..86ab3d97b4b
--- /dev/null
+++ b/source/blender/draw/engines/eevee_next/eevee_cryptomatte.hh
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2022 Blender Foundation. */
+
+/** \file
+ * \ingroup eevee
+ *
+ * Cryptomatte.
+ *
+ * During rasterization, cryptomatte hashes are stored into a single array texture.
+ * The film pass then resamples this texture using pixel filter weighting.
+ * Each cryptomatte layer can hold N samples. These are stored in sequential layers
+ * of the array texture. The samples are sorted and merged only for final rendering.
+ */
+
+#pragma once
+
+#include "eevee_shader_shared.hh"
+
+#include "BKE_cryptomatte.hh"
+
+extern "C" {
+struct Material;
+struct CryptomatteSession;
+}
+
+namespace blender::eevee {
+
+class Instance;
+
+/* -------------------------------------------------------------------- */
+/** \name Cryptomatte
+ * \{ */
+
+class Cryptomatte {
+ private:
+  class Instance &inst_;
+
+  bke::cryptomatte::CryptomatteSessionPtr session_;
+
+  /* Cached pointer to the cryptomatte layer instances. */
+  bke::cryptomatte::CryptomatteLayer *object_layer_ = nullptr;
+  bke::cryptomatte::CryptomatteLayer *asset_layer_ = nullptr;
+  bke::cryptomatte::CryptomatteLayer *material_layer_ = nullptr;
+
+  /** Contains per object hashes (object and asset hash). Indexed by resource ID. */
+  CryptomatteObjectBuf cryptomatte_object_buf;
+
+ public:
+  Cryptomatte(Instance &inst) : inst_(inst){};
+
+  void begin_sync();
+  void sync_object(Object *ob, ResourceHandle res_handle);
+  void sync_material(const ::Material *material);
+  void end_sync();
+
+  template<typename T> void bind_resources(draw::detail::PassBase<T> *pass)
+  {
+    pass->bind_ssbo(CRYPTOMATTE_BUF_SLOT, &cryptomatte_object_buf);
+  }
+
+  /* Register ID to use inside cryptomatte layer and returns associated hash as float. */
+  float register_id(const eViewLayerEEVEEPassType layer, const ID &id) const;
+  void store_metadata(RenderResult *render_result);
+};
+
+/** \} */
+
+}  // namespace blender::eevee