License headers: add SPDX copyright entries for '*.msl' files

source/blender/gpu/metal/kernels/compute_texture_read.msl

@@ -1,3 +1,7 @@
+/* SPDX-FileCopyrightText: 2022 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
 /* MATCHING eGPUTextureType. */
 #define GPU_TEXTURE_1D (1 << 0)
 #define GPU_TEXTURE_2D (1 << 1)

source/blender/gpu/metal/kernels/compute_texture_update.msl

@@ -1,3 +1,7 @@
+/* SPDX-FileCopyrightText: 2022 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
 using namespace metal;
 
 /* MATCHING eGPUTextureType. */

source/blender/gpu/shaders/metal/mtl_shader_common.msl

@@ -1,4 +1,6 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* SPDX-FileCopyrightText: 2022 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
 
 /* Common Metal header to be included in all compiled Metal shaders.
  * Both native MSL shaders and GLSL shaders. */

source/blender/gpu/shaders/metal/mtl_shader_defines.msl

@@ -1,4 +1,6 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* SPDX-FileCopyrightText: 2022 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
 
 /** Special header for mapping commonly defined tokens to API-specific variations.
  * Where possible, this will adhere closely to base GLSL, where semantics are the same.

tools/check_source/check_licenses.py

@@ -94,6 +94,8 @@ def filename_is_c_compat(filename: str) -> bool:
             ".cu",
             # Metal.
             ".metal",
+            # Metal Shading Language.
+            ".msl",
             # Open Shading Language.
             ".osl",
             # Cycles uses this extension.