= Vulkan^(R)^ Specification Repository Scripts

This directory contains scripts used in building the Vulkan API
specification and related artifacts. For the most part, these scripts are
invoked from the top-level directory or from the API Registry in
../xml to build generated components of the specification.

Scripts in this directory include:

  * genvk.py - Python script to generate Vulkan headers and some other
    targets, using the generators described below.
  * reg.py - Python tools to read a registry XML file and call into
    generators to create headers and other types of output.
  * conventions.py, vkconventions.py - API-specific parameters and
    formatting / style conventions used by generators.
  * generator.py - output generator base class.
  ** cgenerator.py - C header output generator.
  ** docgenerator.py - Asciidoc interface language include generator.
  ** extensionmetadocgenerator.py - Generator for Asciidoc extension
     descriptions in spec appendices.
  ** hostsyncgenerator.py - Asciidoc host sync table generator.
  ** pygenerator.py - Generates python encoding of the API description.
  ** validitygenerator.py - Asciidoc validity language generator.

  * checkXrefs - shell script to look for broken internal links in a
    generated HTML specification.
  * check_spec_links.py - validates a variety of markup and content in the
    Asciidoctor specification source.
  * make_ext_dependency.py - generate extension dependencies in Bash and
    Python form for use when building the specification.
  * genRelease, genspec.py - build HTML and PDF Specifications with a
    variety of options to control target directories, extensions included
    while building, etc.
  * genRef.py, reflib.py - extract API reference pages from specification
    source into single-page source documents.
  * indexExt.py - generate HTML index of all extensions for inclusion into
    the Vulkan registry index page.
  * reflow.py, reflow_count.py - reflow specification source text to follow
    style guidelines, and insert Valid Usage statements where they're
    needed.
  * test_check_spec_links.py, test_check_spec_links_api_specific.py,
    test_entity_db.py - these are from another Khronos WG repository and are
    unused by Vulkan at present.
  * htmldiff/htmldiff - HTML diff script (see below).

  * Retired/ - contains obsolete, unused, or single-purpose scripts. Not
    maintained.

HTML Diff Script for Vulkan
===========================

This is a first cut at a script to compare Vulkan HTML specifications. Usage
is simply 'htmldiff file1.html file2.html > diff.html'. The script does not
copy CSS and images required by the input specs, so it's best to generate
the output in the same directory as one of the inputs. However, the script
must be invoked from the directory it is located within.

The scripts used require Python and Perl. Additionally, the python
'utidylib' module and the underlying libtidy C library are required,
which may make it challenging to run the scripts on non-Linux platforms
- I haven't checked and those requirements cannot be easily removed. On
Debian Linux, it may be necessary to install the 'python-utidylib' and
'libtidy' packages if they are not already present. I haven't checked
dependencies for other Linux distributions but they are probably
similar.

The scripts are taken from the code backing the

    http://services.w3.org/htmldiff

website. 'htmldiff' is the Python driver script. 'htmldiff.pl' is the
Perl script which generates the diff after preprocessing of the input
HTML by 'htmldiff'. 'htmldiff.orig' is the original Python script from
the website, modified to run at the command line instead of as a CGI
script.