1 files changed, 55 insertions, 0 deletions
diff --git a/source/blender/io/usd/intern/usd_writer_material.h b/source/blender/io/usd/intern/usd_writer_material.h
new file mode 100644
index 00000000000..b2c732963dc
--- /dev/null
+++ b/source/blender/io/usd/intern/usd_writer_material.h
@@ -0,0 +1,55 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#pragma once
+
+#include <pxr/pxr.h>
+#include <pxr/usd/usd/prim.h>
+#include <pxr/usd/usd/stage.h>
+#include <pxr/usd/usdShade/material.h>
+
+#include <string>
+
+struct bNode;
+struct bNodeTree;
+struct Material;
+struct USDExportParams;
+
+namespace blender::io::usd {
+
+struct USDExporterContext;
+
+/* Entry point to create an approximate USD Preview Surface network from a Cycles node graph.
+ * Due to the limited nodes in the USD Preview Surface specification, only the following nodes
+ * are supported:
+ *  - UVMap
+ *  - Texture Coordinate
+ *  - Image Texture
+ *  - Principled BSDF
+ * More may be added in the future.
+ *
+ * The 'default_uv' paramter is used as the default UV set name sampled by the primvar
+ * reader shaders generated for image texture nodes that don't have an attached UVMAp node. */
+void create_usd_preview_surface_material(const USDExporterContext &usd_export_context,
+                                         Material *material,
+                                         pxr::UsdShadeMaterial &usd_material,
+                                         const std::string &default_uv = "");
+
+/* Entry point to create USD Shade Material network from Blender viewport display settings. */
+void create_usd_viewport_material(const USDExporterContext &usd_export_context,
+                                  Material *material,
+                                  pxr::UsdShadeMaterial &usd_material);
+
+}  // namespace blender::io::usd