Cycles: use SPDX license headers

* Replace license text in headers with SPDX identifiers.
* Remove specific license info from outdated readme.txt, instead leave details
  to the source files.
* Add list of SPDX license identifiers used, and corresponding license texts.
* Update copyright dates while we're at it.

Ref D14069, T95597

12 files changed, 24 insertions, 180 deletions

diff --git a/intern/cycles/kernel/device/cpu/compat.h b/intern/cycles/kernel/device/cpu/compat.h
index 5ccca52255f..e1c20169582 100644
--- a/intern/cycles/kernel/device/cpu/compat.h
+++ b/intern/cycles/kernel/device/cpu/compat.h
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2013 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 #pragma once
 
diff --git a/intern/cycles/kernel/device/cpu/globals.h b/intern/cycles/kernel/device/cpu/globals.h
index 746e48b9880..7e080d428ea 100644
--- a/intern/cycles/kernel/device/cpu/globals.h
+++ b/intern/cycles/kernel/device/cpu/globals.h
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2013 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 /* Constant Globals */
 
diff --git a/intern/cycles/kernel/device/cpu/image.h b/intern/cycles/kernel/device/cpu/image.h
index 93f956e354d..b6bcd19b9ea 100644
--- a/intern/cycles/kernel/device/cpu/image.h
+++ b/intern/cycles/kernel/device/cpu/image.h
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2016 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 #pragma once
 
diff --git a/intern/cycles/kernel/device/cpu/kernel.cpp b/intern/cycles/kernel/device/cpu/kernel.cpp
index a16c637d5ac..b12e3089378 100644
--- a/intern/cycles/kernel/device/cpu/kernel.cpp
+++ b/intern/cycles/kernel/device/cpu/kernel.cpp
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2013 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 /* CPU kernel entry points */
 
diff --git a/intern/cycles/kernel/device/cpu/kernel.h b/intern/cycles/kernel/device/cpu/kernel.h
index 6af8094b1ea..647b405140a 100644
--- a/intern/cycles/kernel/device/cpu/kernel.h
+++ b/intern/cycles/kernel/device/cpu/kernel.h
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2013 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 #pragma once
 
diff --git a/intern/cycles/kernel/device/cpu/kernel_arch.h b/intern/cycles/kernel/device/cpu/kernel_arch.h
index 61f62f3136b..4f9035288f9 100644
--- a/intern/cycles/kernel/device/cpu/kernel_arch.h
+++ b/intern/cycles/kernel/device/cpu/kernel_arch.h
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2013 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 /* Templated common declaration part of all CPU kernels. */
 
diff --git a/intern/cycles/kernel/device/cpu/kernel_arch_impl.h b/intern/cycles/kernel/device/cpu/kernel_arch_impl.h
index 747c47c34c9..0e5f7b4a2fd 100644
--- a/intern/cycles/kernel/device/cpu/kernel_arch_impl.h
+++ b/intern/cycles/kernel/device/cpu/kernel_arch_impl.h
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2013 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 /* Templated common implementation part of all CPU kernels.
  *
diff --git a/intern/cycles/kernel/device/cpu/kernel_avx.cpp b/intern/cycles/kernel/device/cpu/kernel_avx.cpp
index cece750a255..872ad5ce7e2 100644
--- a/intern/cycles/kernel/device/cpu/kernel_avx.cpp
+++ b/intern/cycles/kernel/device/cpu/kernel_avx.cpp
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2013 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 /* Optimized CPU kernel entry points. This file is compiled with AVX
  * optimization flags and nearly all functions inlined, while kernel.cpp
diff --git a/intern/cycles/kernel/device/cpu/kernel_avx2.cpp b/intern/cycles/kernel/device/cpu/kernel_avx2.cpp
index fad4581236e..a1644fb0dfe 100644
--- a/intern/cycles/kernel/device/cpu/kernel_avx2.cpp
+++ b/intern/cycles/kernel/device/cpu/kernel_avx2.cpp
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2014 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 /* Optimized CPU kernel entry points. This file is compiled with AVX2
  * optimization flags and nearly all functions inlined, while kernel.cpp
diff --git a/intern/cycles/kernel/device/cpu/kernel_sse2.cpp b/intern/cycles/kernel/device/cpu/kernel_sse2.cpp
index 5fb4849ac08..6f420274e4a 100644
--- a/intern/cycles/kernel/device/cpu/kernel_sse2.cpp
+++ b/intern/cycles/kernel/device/cpu/kernel_sse2.cpp
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2013 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 /* Optimized CPU kernel entry points. This file is compiled with SSE2
  * optimization flags and nearly all functions inlined, while kernel.cpp
diff --git a/intern/cycles/kernel/device/cpu/kernel_sse3.cpp b/intern/cycles/kernel/device/cpu/kernel_sse3.cpp
index c9424682fd4..eb78b61a723 100644
--- a/intern/cycles/kernel/device/cpu/kernel_sse3.cpp
+++ b/intern/cycles/kernel/device/cpu/kernel_sse3.cpp
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2013 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 /* Optimized CPU kernel entry points. This file is compiled with SSE3/SSSE3
  * optimization flags and nearly all functions inlined, while kernel.cpp
diff --git a/intern/cycles/kernel/device/cpu/kernel_sse41.cpp b/intern/cycles/kernel/device/cpu/kernel_sse41.cpp
index 849ebf51989..1cfea5dc230 100644
--- a/intern/cycles/kernel/device/cpu/kernel_sse41.cpp
+++ b/intern/cycles/kernel/device/cpu/kernel_sse41.cpp
@@ -1,18 +1,5 @@
-/*
- * Copyright 2011-2013 Blender Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright 2011-2022 Blender Foundation */
 
 /* Optimized CPU kernel entry points. This file is compiled with SSE3/SSSE3
  * optimization flags and nearly all functions inlined, while kernel.cpp