docs: Begin documenting ISL

This commit mostly just adds the framework required to scrape
documentation out of the ISL sources and headers.  The method chosen
here is a combination of doxygen and breathe (a sphinx extension for
doxygen integration).  I'll freely admit that doxygen is pretty terrible
but it seems like the best option we have available to us today.

Acked-by: Emma Anholt <emma@anholt.net>
Acked-by: Daniel Stone <daniels@collabora.com>
Acked-by: Erik Faye-Lund <erik.faye-lund@collabora.com>.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11366>

1 files changed, 92 insertions, 0 deletions

diff --git a/docs/doxygen-wrapper.py b/docs/doxygen-wrapper.py
new file mode 100755
index 00000000000..49735b3504c
--- /dev/null
+++ b/docs/doxygen-wrapper.py
@@ -0,0 +1,92 @@
+#!/usr/bin/env python3
+#
+# Copyright © 2021 Intel Corporation
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sub license, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice (including the
+# next paragraph) shall be included in all copies or substantial portions
+# of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+# IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+# ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+import argparse
+from mako.template import Template
+import os
+import subprocess
+import tempfile
+
+INPUT_PATHS = [
+    'src/intel/isl',
+]
+
+TEMPLATE_DOXYFILE = Template("""
+# Doxyfile 1.9.1
+DOXYFILE_ENCODING = UTF-8
+PROJECT_NAME = "Mesa"
+
+INPUT = ${' '.join(input_files)}
+XML_OUTPUT = ${output_xml}
+
+# Only generate XML
+GENERATE_HTML = NO
+GENERATE_LATEX = NO
+GENERATE_XML = YES
+
+# Add aliases for easily writing reStructuredText in comments
+ALIASES  = "rst=\\verbatim embed:rst:leading-asterisk"
+ALIASES += "endrst=\endverbatim"
+
+ENABLE_PREPROCESSING = YES
+MACRO_EXPANSION = YES
+EXPAND_ONLY_PREDEF = YES
+
+# Defines required to keep doxygen from tripping on our attribute macros
+PREDEFINED  = PACKED=
+PREDEFINED += ATTRIBUTE_CONST=
+""")
+
+def run_doxygen(output_path, input_paths=[]):
+    doxyfile = tempfile.NamedTemporaryFile(mode='w', delete=False)
+    try:
+        doxyfile.write(TEMPLATE_DOXYFILE.render(
+            input_files=[ os.path.abspath(i) for i in input_paths ],
+            output_xml=os.path.abspath(output_path),
+        ))
+        doxyfile.close()
+
+        subprocess.run(['doxygen', doxyfile.name])
+
+    finally:
+        doxyfile.close()
+        os.unlink(doxyfile.name)
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--out-dir',
+                        help='Output XML directory.',
+                        required=True)
+    args = parser.parse_args()
+
+    this_dir = os.path.dirname(os.path.abspath(__file__))
+    mesa_dir = os.path.join(this_dir, '..')
+    def fixpath(p):
+        if os.path.isabs(p):
+            return p
+        return os.path.join(mesa_dir, p)
+
+    input_paths = [ fixpath(p) for p in INPUT_PATHS ]
+
+    run_doxygen(args.out_dir, input_paths)