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package OpenGL::Spec;
# A very simple task further complicated by the fact that some people
# can't read, others use legacy Operating Systems, and others don't give
# a damn about using a halfway decent text editor.
#
# The code to parse the _template_ is so simple and straightforward...
# yet the code to parse the real spec files is this mess.
my %typemap = (
bitfield => "GLbitfield",
boolean => "GLboolean",
# fsck up in EXT_vertex_array
Boolean => "GLboolean",
byte => "GLbyte",
clampd => "GLclampd",
clampf => "GLclampf",
double => "GLdouble",
enum => "GLenum",
# Intel fsck up
Glenum => "GLenum",
float => "GLfloat",
half => "GLuint",
int => "GLint",
short => "GLshort",
sizei => "GLsizei",
ubyte => "GLubyte",
uint => "GLuint",
ushort => "GLushort",
DMbuffer => "void *",
# ARB VBO introduces these
sizeiptrARB => "GLsizeiptrARB",
intptrARB => "GLintptrARB",
# ARB shader objects introduces these, charARB is at least 8 bits,
# handleARB is at least 32 bits
charARB => "GLcharARB",
handleARB => "GLhandleARB",
# GLX 1.3 defines new types which might not be available at compile time
#GLXFBConfig => "void*",
#GLXFBConfigID => "XID",
#GLXContextID => "XID",
#GLXWindow => "XID",
#GLXPbuffer => "XID",
# Weird stuff for some SGIX extension
#GLXFBConfigSGIX => "void*",
#GLXFBConfigIDSGIX => "XID",
);
my %void_typemap = (
void => "GLvoid",
);
my $section_re = qr{^[A-Z]};
my $function_re = qr{^(.+) ([a-z][a-z0-9_]*) \((.+)\)$}i;
my $token_re = qr{^([A-Z0-9][A-Z0-9_]*):?\s+((?:0x)?[0-9A-F]+)(.*)$};
my $prefix_re = qr{^(?:AGL | GLX | WGL)_}x;
my $eofnc_re = qr{ \);?$ | ^$ }x;
my $function_re = qr{^(.+) ([a-z][a-z0-9_]*) \((.+)\)$}i;
my $prefix_re = qr{^(?:gl | agl | wgl | glX)}x;
my $types_re = __compile_wordlist_cap(keys %typemap);
my $voidtype_re = __compile_wordlist_cap(keys %void_typemap);
sub new($)
{
my $class = shift;
my $self = { section => {} };
$self->{filename} = shift;
local $/;
open(my $fh, "<$self->{filename}") or die "Can't open $self->{filename}";
my $content = <$fh>;
my $section;
my $s = $self->{section};
$content =~ s{[ \t]+$}{}mg;
# Join lines that end with a word-character and ones that *begin*
# with one
$content =~ s{(\w)\n(\w)}{$1 $2}sg;
foreach (split /\n/, $content)
{
if (/$section_re/)
{
chomp;
s/^Name String$/Name Strings/; # Fix common mistake
$section = $_;
$s->{$section} = "";
}
elsif (defined $section and exists $s->{$section})
{
s{^\s+}{}mg; # Remove leading whitespace
$s->{$section} .= $_ . "\n";
}
}
$s->{$_} =~ s{(?:^\n+|\n+$)}{}s foreach keys %$s;
bless $self, $class;
}
sub sections()
{
my $self = shift;
keys %{$self->{section}};
}
sub name()
{
my $self = shift;
$self->{section}->{Name};
}
sub name_strings()
{
my $self = shift;
split("\n", $self->{section}->{"Name Strings"});
}
sub tokens()
{
my $self = shift;
my %tokens = ();
foreach (split /\n/, $self->{section}->{"New Tokens"})
{
next unless /$token_re/;
my ($name, $value) = ($1, $2);
$name =~ s{^}{GL_} unless $name =~ /$prefix_re/;
$tokens{$name} = $value;
}
return %tokens;
}
sub functions()
{
my $self = shift;
my %functions = ();
my @fnc = ();
foreach (split /\n/, $self->{section}->{"New Procedures and Functions"})
{
push @fnc, $_ unless ($_ eq "" or $_ eq "None");
next unless /$eofnc_re/;
if (__normalize_proto(@fnc) =~ /$function_re/)
{
my ($return, $name, $parms) = ($1, $2, $3);
if (!__ignore_function($name, $extname))
{
$name =~ s/^/gl/ unless $name =~ /$prefix_re/;
if ($name =~ /^gl/ && $name !~ /^glX/)
{
$return =~ s/$types_re/$typemap{$1}/g;
$return =~ s/$voidtype_re/$void_typemap{$1}/g;
$parms =~ s/$types_re/$typemap{$1}/g;
$parms =~ s/$voidtype_re/$void_typemap{$1}/g;
}
$functions{$name} = {
rtype => $return,
parms => $parms,
};
}
}
@fnc = ();
}
return %functions;
}
sub __normalize_proto
{
local $_ = join(" ", @_);
s/\s+/ /g; # multiple whitespace -> single space
s/\s*\(\s*/ \(/; # exactly one space before ( and none after
s/\s*\)\s*/\)/; # no after before or after )
s/\s*\*([a-zA-Z])/\* $1/; # "* identifier" XXX: g missing?
s/\*wgl/\* wgl/; # "* wgl" XXX: why doesn't the
s/\*glX/\* glX/; # "* glX" previous re catch this?
s/\.\.\./void/; # ... -> void
s/;$//; # remove ; at the end of the line
return $_;
}
sub __ignore_function
{
return 0;
}
sub __compile_regex
{
my $regex = join('', @_);
return qr/$regex/
}
sub __compile_wordlist_cap
{
__compile_regex('\b(', join('|', @_), ')\b');
}
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