From 4bad4bfc6ae5a81c44038cb1259f44befbb3afe0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Benjamin=20Schmith=C3=BCsen?= <UX3D-schmithuesen>
Date: Thu, 11 Apr 2019 11:26:23 +0200
Subject: glTF: add Draco shared library for mesh compression.

Draco is added as a library under extern/ and builds a shared library that is
installed into the Python site-packages. This is then loaded by the glTF add-on
to do mesh compression.

Differential Revision: https://developer.blender.org/D4501
---
 extern/draco/dracoenc/cmake/draco_features.cmake | 57 ++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 extern/draco/dracoenc/cmake/draco_features.cmake

(limited to 'extern/draco/dracoenc/cmake/draco_features.cmake')

diff --git a/extern/draco/dracoenc/cmake/draco_features.cmake b/extern/draco/dracoenc/cmake/draco_features.cmake
new file mode 100644
index 00000000000..057b0b07ecd
--- /dev/null
+++ b/extern/draco/dracoenc/cmake/draco_features.cmake
@@ -0,0 +1,57 @@
+if (NOT DRACO_CMAKE_DRACO_FEATURES_CMAKE_)
+set(DRACO_CMAKE_DRACO_FEATURES_CMAKE_ 1)
+
+set(draco_features_file_name "${draco_build_dir}/draco/draco_features.h")
+set(draco_features_list)
+
+# Macro that handles tracking of Draco preprocessor symbols for the purpose of
+# producing draco_features.h.
+#
+# draco_enable_feature(FEATURE <feature_name> [TARGETS <target_name>])
+#   FEATURE is required. It should be a Draco preprocessor symbol.
+#   TARGETS is optional. It can be one or more draco targets.
+#
+# When the TARGETS argument is not present the preproc symbol is added to
+# draco_features.h. When it is draco_features.h is unchanged, and
+# target_compile_options() is called for each target specified.
+macro (draco_enable_feature)
+  set(def_flags)
+  set(def_single_arg_opts FEATURE)
+  set(def_multi_arg_opts TARGETS)
+  cmake_parse_arguments(DEF "${def_flags}" "${def_single_arg_opts}"
+                        "${def_multi_arg_opts}" ${ARGN})
+  if ("${DEF_FEATURE}" STREQUAL "")
+    message(FATAL_ERROR "Empty FEATURE passed to draco_enable_feature().")
+  endif ()
+
+  # Do nothing/return early if $DEF_FEATURE is already in the list.
+  list(FIND draco_features_list ${DEF_FEATURE} df_index)
+  if (NOT df_index EQUAL -1)
+    return ()
+  endif ()
+
+  list(LENGTH DEF_TARGETS df_targets_list_length)
+  if (${df_targets_list_length} EQUAL 0)
+    list(APPEND draco_features_list ${DEF_FEATURE})
+  else ()
+    foreach (target ${DEF_TARGETS})
+      target_compile_definitions(${target} PRIVATE ${DEF_FEATURE})
+    endforeach ()
+  endif ()
+endmacro ()
+
+# Function for generating draco_features.h.
+function (draco_generate_features_h)
+  file(WRITE "${draco_features_file_name}"
+       "// GENERATED FILE -- DO NOT EDIT\n\n"
+       "#ifndef DRACO_FEATURES_H_\n"
+       "#define DRACO_FEATURES_H_\n\n")
+
+  foreach (feature ${draco_features_list})
+    file(APPEND "${draco_features_file_name}" "#define ${feature}\n")
+  endforeach ()
+
+  file(APPEND "${draco_features_file_name}" "\n#endif  // DRACO_FEATURES_H_")
+endfunction ()
+
+endif ()  # DRACO_CMAKE_DRACO_FEATURES_CMAKE_
-- 
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