#!/usr/bin/perl
##
## Copyright (C) 2008-2019, Nigel Stewart <nigels[]users sourceforge net>
## Copyright (C) 2002-2008, Marcelo E. Magallon <mmagallo[]debian org>
## Copyright (C) 2002-2008, Milan Ikits <milan ikits[]ieee org>
##
## This program is distributed under the terms and conditions of the GNU
## General Public License Version 2 as published by the Free Software
## Foundation or, at your option, any later version.

use strict;
use warnings;

use lib '.';
do 'bin/make.pl';

# token
sub make_define($$)
{
    return "#define $_[0] $_[1]"
}

# type declaration
sub make_type($$)
{
    return "@_;"
}

# function pointer type declaration
sub make_pfn_type($%)
{
    our $api;
    return join(' ', "typedef", $_[1]->{rtype},
        "($api * PFN" . (uc $_[0]) . "PROC)",
        "(" . $_[1]->{parms} . ")") . ";";
}

# function name alias
sub make_pfn_alias($%)
{
    our $type;
    return join(" ", "#define", $_[0], $type . "EW_GET_FUN(" . prefixname($_[0]) . ")")
}

my @extlist = ();
my %extensions = ();

our $api = shift;
our $type = shift;

if (@ARGV)
{
    @extlist = @ARGV;

	foreach my $ext (sort @extlist)
	{
		my ($extname, $exturl, $extstring, $reuse, $types, $tokens, $functions, $exacts) = parse_ext($ext);

		make_separator($extname);
		print "#ifndef $extname\n#define $extname 1\n";
		output_tokens($tokens, \&make_define);
		output_types($types, \&make_type);
		output_exacts($exacts, \&make_exact);
		output_decls($functions, \&make_pfn_type);
		output_decls($functions, \&make_pfn_alias);

		my $extvar = $extname;
		$extvar =~ s/GL(X*)_/GL$1EW_/;
		
		print "\n#define $extvar " . $type . "EW_GET_VAR(" . prefix_varname($extvar) . ")\n";
		print "\n#endif /* $extname */\n\n";
	}
}