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#!/usr/bin/perl -w
#
# gen-gdkglglext-h.pl
#
# Script for generating gdk/gdkglglext.h from SGI's OpenGL extension
# header.
#
# written by Naofumi Yasufuku <naofumi@users.sourceforge.net>
#
@input_headers = ("glext.h", "glext-extra.h");
#---------------
open(IN, "common-header.h") || die "cannot open common-header.h";
print while (<IN>);
close(IN);
print <<EOF;
/*
* This is a generated file. Please modify "gen-gdkglglext-h.pl".
*/
#ifndef __GDK_GL_GLEXT_H__
#define __GDK_GL_GLEXT_H__
#include <glib.h>
#ifdef G_OS_WIN32
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#endif
#include <GL/gl.h>
#include <gdk/gdkgldefs.h>
#include <gdk/gdkglquery.h>
G_BEGIN_DECLS
#ifndef HAVE_GLHALFNV
#if defined(GL_NV_half_float) && defined(GDKGLEXT_NEED_GLHALFNV_TYPEDEF)
typedef unsigned short GLhalfNV;
#endif
#endif
/* Avoid old glext.h bug. */
#if !defined(GL_SGIS_point_parameters) && defined(GL_POINT_SIZE_MIN_SGIS)
#define GL_SGIS_point_parameters 1
#endif
#undef __glext_h_
#undef GL_GLEXT_VERSION
#include <gdk/glext/glext.h>
#include <gdk/glext/glext-extra.h>
EOF
#---------------
foreach $in (@input_headers) {
open(IN, $in) || die "cannot open $in";
while (<IN>) {
if (/#ifndef\s+GL_[a-zA-Z0-9]+_[a-z0-9_]+/) {
@line = split;
$_ = <IN>;
if (/#define\s+$line[1]/) {
while (<IN>) {
if (/#ifdef\s+GL_GLEXT_PROTOTYPES/) {
$extension = $line[1];
# function prototypes
@functions = ();
while (<IN>) {
last if (/#endif/);
($func) = /(gl\w+)/;
push(@functions, $func);
}
# typedefs
@typedefs = ();
while (<IN>) {
last if (/#endif/);
chomp;
push(@typedefs, $_);
}
generate_code();
last;
} elsif (/#endif/) {
last;
}
}
}
}
}
close(IN);
}
#---------------
print <<EOF;
G_END_DECLS
#endif /* __GDK_GL_GLEXT_H__ */
EOF
#---------------
# code generator
sub generate_code {
print "/*\n";
print " * $extension\n";
print " */\n\n";
$i = 0;
foreach $func (@functions) {
print "/* $func */\n";
$type = $typedefs[$i++];
$type =~ s/PFN\w+/GdkGLProc_$func/;
print "$type\n";
print "GdkGLProc gdk_gl_get_$func (void);\n";
$_ = $type;
($args) = /\(.*\)\s+\((.*)\)/;
@args_list = split(/,\s+/, $args);
foreach (@args_list) {
($_) = /.*\s+\**(\w+)$/;
$_ = "" if (!$_);
}
$args = join(", ", @args_list);
if ($args eq "") {
print "#define gdk_gl_$func(proc) \\\n";
print " ( ((GdkGLProc_$func) (proc)) () )\n";
} else {
print "#define gdk_gl_$func(proc, $args) \\\n";
print " ( ((GdkGLProc_$func) (proc)) ($args) )\n";
}
print "\n";
}
print "/* proc struct */\n\n";
print "typedef struct _GdkGL_$extension GdkGL_$extension;\n\n";
print "struct _GdkGL_$extension\n";
print "{\n";
foreach $func (@functions) {
print " GdkGLProc_$func $func;\n";
}
print "};\n\n";
print "GdkGL_$extension *gdk_gl_get_$extension (void);\n\n";
}
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