new stuff

vendor/assimp/contrib/draco/cmake/draco_cpu_detection.cmake

@@ -0,0 +1,42 @@
+# Copyright 2021 The Draco Authors
+#
+# 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.
+
+if(DRACO_CMAKE_DRACO_CPU_DETECTION_CMAKE_)
+  return()
+endif() # DRACO_CMAKE_DRACO_CPU_DETECTION_CMAKE_
+set(DRACO_CMAKE_DRACO_CPU_DETECTION_CMAKE_ 1)
+
+# Detect optimizations available for the current target CPU.
+macro(draco_optimization_detect)
+  if(DRACO_ENABLE_OPTIMIZATIONS)
+    string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" cpu_lowercase)
+    if(cpu_lowercase MATCHES "^arm|^aarch64")
+      set(draco_have_neon ON)
+    elseif(cpu_lowercase MATCHES "^x86|amd64")
+      set(draco_have_sse4 ON)
+    endif()
+  endif()
+
+  if(draco_have_neon AND DRACO_ENABLE_NEON)
+    list(APPEND draco_defines "DRACO_ENABLE_NEON=1")
+  else()
+    list(APPEND draco_defines "DRACO_ENABLE_NEON=0")
+  endif()
+
+  if(draco_have_sse4 AND DRACO_ENABLE_SSE4_1)
+    list(APPEND draco_defines "DRACO_ENABLE_SSE4_1=1")
+  else()
+    list(APPEND draco_defines "DRACO_ENABLE_SSE4_1=0")
+  endif()
+endmacro()