Generate the Epoxy API reference using Doxygen

The build is conditional on:

 * using the Meson build
 * passing the `-Denable-docs=true` configuration switch
 * having `doxygen` installed

Currently, the generated HTML is kind of empty, but it works.

2 files changed, 238 insertions, 0 deletions

diff --git a/doc/Doxyfile.in b/doc/Doxyfile.in
new file mode 100644
index 0000000..57a680f
--- /dev/null
+++ b/doc/Doxyfile.in
@@ -0,0 +1,206 @@
+DOXYFILE_ENCODING      = UTF-8
+PROJECT_NAME           = @PACKAGE_NAME@
+PROJECT_NUMBER         = @PACKAGE_VERSION@
+PROJECT_BRIEF          =
+PROJECT_LOGO           =
+OUTPUT_DIRECTORY       = doc 
+CREATE_SUBDIRS         = NO
+ALLOW_UNICODE_NAMES    = YES
+OUTPUT_LANGUAGE        = English
+BRIEF_MEMBER_DESC      = YES
+REPEAT_BRIEF           = YES
+ABBREVIATE_BRIEF       =
+ALWAYS_DETAILED_SEC    = NO
+INLINE_INHERITED_MEMB  = NO
+FULL_PATH_NAMES        = YES
+STRIP_FROM_PATH        = "@top_srcdir@/include" "@top_builddir@/include"
+
+SHORT_NAMES            = NO
+JAVADOC_AUTOBRIEF      = YES
+QT_AUTOBRIEF           = NO
+MULTILINE_CPP_IS_BRIEF = NO
+INHERIT_DOCS           = YES
+SEPARATE_MEMBER_PAGES  = NO
+TAB_SIZE               = 8
+ALIASES                = "newin{2}=\xrefitem since_\1_\2 \"Since @PACKAGE_NAME@ \1.\2\" \"New API in @PACKAGE_NAME@ \1.\2\""
+TCL_SUBST              =
+OPTIMIZE_OUTPUT_FOR_C  = YES
+OPTIMIZE_OUTPUT_JAVA   = NO
+OPTIMIZE_FOR_FORTRAN   = NO
+OPTIMIZE_OUTPUT_VHDL   = NO
+EXTENSION_MAPPING      =
+MARKDOWN_SUPPORT       = YES
+AUTOLINK_SUPPORT       = YES
+BUILTIN_STL_SUPPORT    = NO
+CPP_CLI_SUPPORT        = NO
+SIP_SUPPORT            = NO
+IDL_PROPERTY_SUPPORT   = NO
+DISTRIBUTE_GROUP_DOC   = NO
+GROUP_NESTED_COMPOUNDS = NO
+SUBGROUPING            = YES
+INLINE_GROUPED_CLASSES = NO
+INLINE_SIMPLE_STRUCTS  = NO
+TYPEDEF_HIDES_STRUCT   = NO
+LOOKUP_CACHE_SIZE      = 0
+
+EXTRACT_ALL            = YES
+EXTRACT_PRIVATE        = NO
+EXTRACT_PACKAGE        = NO
+EXTRACT_STATIC         = NO
+EXTRACT_LOCAL_CLASSES  = NO
+EXTRACT_LOCAL_METHODS  = NO
+EXTRACT_ANON_NSPACES   = NO
+HIDE_UNDOC_MEMBERS     = YES
+HIDE_UNDOC_CLASSES     = YES
+HIDE_FRIEND_COMPOUNDS  = YES
+HIDE_IN_BODY_DOCS      = YES
+INTERNAL_DOCS          = NO
+CASE_SENSE_NAMES       = YES
+HIDE_SCOPE_NAMES       = NO
+HIDE_COMPOUND_REFERENCE= NO
+SHOW_INCLUDE_FILES     = YES
+SHOW_GROUPED_MEMB_INC  = NO
+FORCE_LOCAL_INCLUDES   = NO
+INLINE_INFO            = YES
+SORT_MEMBER_DOCS       = YES
+SORT_BRIEF_DOCS        = NO
+SORT_MEMBERS_CTORS_1ST = YES
+SORT_GROUP_NAMES       = YES
+SORT_BY_SCOPE_NAME     = YES
+STRICT_PROTO_MATCHING  = NO
+GENERATE_TODOLIST      = YES
+GENERATE_TESTLIST      = NO
+GENERATE_BUGLIST       = YES
+GENERATE_DEPRECATEDLIST= YES
+ENABLED_SECTIONS       =
+MAX_INITIALIZER_LINES  = 2
+SHOW_USED_FILES        = YES
+SHOW_FILES             = YES
+SHOW_NAMESPACES        = NO
+FILE_VERSION_FILTER    =
+LAYOUT_FILE            =
+CITE_BIB_FILES         =
+
+QUIET                  = YES 
+WARNINGS               = YES
+WARN_IF_UNDOCUMENTED   = YES
+WARN_IF_DOC_ERROR      = YES
+WARN_NO_PARAMDOC       = YES
+WARN_AS_ERROR          = NO
+WARN_FORMAT            = "$file:$line: $text"
+WARN_LOGFILE           = doc/doxygen.log
+
+INPUT                  = "@top_srcdir@/include/epoxy" "@top_srcdir@/src"
+INPUT_ENCODING         = UTF-8
+FILE_PATTERNS          = "*.h" "*.c"
+RECURSIVE              = NO
+EXCLUDE                = "@top_srcdir@/src/gen_dispatch.py"
+EXCLUDE_SYMLINKS       = YES
+EXCLUDE_PATTERNS       =
+EXCLUDE_SYMBOLS        = _* GLAPI* KHRONOS_* APIENTRY* GLX* wgl*
+EXAMPLE_PATH           =
+EXAMPLE_PATTERNS       =
+EXAMPLE_RECURSIVE      = NO
+IMAGE_PATH             =
+INPUT_FILTER           =
+FILTER_PATTERNS        =
+FILTER_SOURCE_FILES    = NO
+FILTER_SOURCE_PATTERNS =
+USE_MDFILE_AS_MAINPAGE =
+
+SOURCE_BROWSER         = NO
+INLINE_SOURCES         = NO
+STRIP_CODE_COMMENTS    = YES
+REFERENCED_BY_RELATION = NO
+REFERENCES_RELATION    = NO
+REFERENCES_LINK_SOURCE = YES
+SOURCE_TOOLTIPS        = YES
+USE_HTAGS              = NO
+VERBATIM_HEADERS       = NO
+
+ALPHABETICAL_INDEX     = YES
+COLS_IN_ALPHA_INDEX    = 3
+IGNORE_PREFIX          = "epoxy"
+
+GENERATE_HTML          = YES
+HTML_OUTPUT            = html
+HTML_FILE_EXTENSION    = .html
+HTML_HEADER            =
+HTML_FOOTER            =
+HTML_STYLESHEET        =
+HTML_EXTRA_STYLESHEET  =
+HTML_EXTRA_FILES       =
+HTML_COLORSTYLE_HUE    = 220
+HTML_COLORSTYLE_SAT    = 100
+HTML_COLORSTYLE_GAMMA  = 80
+HTML_TIMESTAMP         = YES
+HTML_DYNAMIC_SECTIONS  = NO
+HTML_INDEX_NUM_ENTRIES = 100
+GENERATE_DOCSET        = NO
+DOCSET_FEEDNAME        = "Doxygen generated docs"
+DOCSET_BUNDLE_ID       = org.doxygen.Project
+DOCSET_PUBLISHER_ID    = org.doxygen.Publisher
+DOCSET_PUBLISHER_NAME  = Publisher
+GENERATE_HTMLHELP      = NO
+CHM_FILE               =
+HHC_LOCATION           =
+GENERATE_CHI           = NO
+CHM_INDEX_ENCODING     =
+BINARY_TOC             = NO
+TOC_EXPAND             = NO
+GENERATE_QHP           = NO
+QCH_FILE               =
+QHP_NAMESPACE          =
+QHP_VIRTUAL_FOLDER     = doc
+QHP_CUST_FILTER_NAME   =
+QHP_CUST_FILTER_ATTRS  =
+QHP_SECT_FILTER_ATTRS  =
+QHG_LOCATION           =
+GENERATE_ECLIPSEHELP   = NO
+ECLIPSE_DOC_ID         = org.doxygen.Project
+DISABLE_INDEX          = NO
+GENERATE_TREEVIEW      = NO
+ENUM_VALUES_PER_LINE   = 1
+TREEVIEW_WIDTH         = 250
+EXT_LINKS_IN_WINDOW    = NO
+FORMULA_FONTSIZE       = 10
+FORMULA_TRANSPARENT    = YES
+USE_MATHJAX            = NO
+MATHJAX_FORMAT         = HTML-CSS
+MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
+MATHJAX_EXTENSIONS     =
+MATHJAX_CODEFILE       =
+SEARCHENGINE           = NO
+SERVER_BASED_SEARCH    = NO
+EXTERNAL_SEARCH        = NO
+SEARCHENGINE_URL       =
+SEARCHDATA_FILE        =
+EXTERNAL_SEARCH_ID     =
+EXTRA_SEARCH_MAPPINGS  =
+
+GENERATE_LATEX         = NO
+GENERATE_RTF           = NO
+GENERATE_MAN           = NO
+GENERATE_XML           = NO
+GENERATE_DOCBOOK       = NO
+GENERATE_AUTOGEN_DEF   = NO
+GENERATE_PERLMOD       = NO
+
+ENABLE_PREPROCESSING   = YES
+MACRO_EXPANSION        = YES
+EXPAND_ONLY_PREDEF     = YES
+SEARCH_INCLUDES        = YES
+INCLUDE_PATH           = "@top_srcdir@/include" \
+                         "@top_builddir@/include"
+INCLUDE_FILE_PATTERNS  = *.h
+PREDEFINED             = DOXYGEN_SHOULD_SKIP_THIS \
+                         "PUBLIC=" \
+                         "EPOXY_PUBLIC=" \
+                         "EPOXY_IMPORTEXPORT="
+EXPAND_AS_DEFINED      =
+SKIP_FUNCTION_MACROS   = YES
+
+CLASS_DIAGRAMS         = NO
+ALLEXTERNALS           = NO
+EXTERNAL_GROUPS        = NO
+EXTERNAL_PAGES         = NO
diff --git a/doc/meson.build b/doc/meson.build
new file mode 100644
index 0000000..b99bce3
--- /dev/null
+++ b/doc/meson.build
@@ -0,0 +1,32 @@
+doc_sources = [
+  join_paths(meson.source_root(), 'include/epoxy/gl.h'),
+  join_paths(meson.source_root(), 'include/epoxy/egl.h'),
+  join_paths(meson.source_root(), 'include/epoxy/glx.h'),
+  join_paths(meson.source_root(), 'include/epoxy/wgl.h'),
+
+  join_paths(meson.source_root(), 'src/dispatch_common.c'),
+  join_paths(meson.source_root(), 'src/dispatch_egl.c'),
+  join_paths(meson.source_root(), 'src/dispatch_glx.c'),
+  join_paths(meson.source_root(), 'src/dispatch_wgl.c'),
+]
+
+doxyfile_conf = configuration_data()
+doxyfile_conf.set('PACKAGE_NAME', meson.project_name())
+doxyfile_conf.set('PACKAGE_VERSION', meson.project_version())
+doxyfile_conf.set('top_srcdir', meson.source_root())
+doxyfile_conf.set('top_builddir', meson.build_root())
+doxyfile_conf.set('DOC_SOURCES', ' '.join(doc_sources))
+
+doxyfile = configure_file(input: 'Doxyfile.in',
+                          output: 'Doxyfile',
+                          configuration: doxyfile_conf,
+                          install: false)
+
+docdir = join_paths(epoxy_datadir, 'doc')
+
+html_target = custom_target('epoxy-docs',
+                            input: [ doxyfile ] + doc_sources,
+                            output: [ 'html' ],
+                            command: [ doxygen, doxyfile ],
+                            install: true,
+                            install_dir: join_paths(docdir, 'epoxy'))