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############################################################
#
# OpenGL::Shader - Copyright 2007 Graphcomp - ALL RIGHTS RESERVED
# Author: Bob "grafman" Free - grafman@graphcomp.com
#
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.
#
############################################################
### SEE DOCS IN Shader.pod
package OpenGL::Shader;
use strict;
use warnings;
use Carp;
use OpenGL(':all');
our $VERSION = '1.02';
our @ISA = qw(Exporter);
our $SHADER_TYPES;
# Return hashref of supported shader types
# Must be able to open a hidden GL context.
sub GetTypes {
return ReturnTypes() if (ref($SHADER_TYPES));
my $dir = __FILE__;
return if ($dir !~ s|\.pm$||);
my @types;
# Grab OpenGL/Shader modules
if (opendir(DIR,$dir)) {
foreach my $type (readdir(DIR)) {
next if ($type !~ s|\.pm$||);
next if ($type eq 'Common');
next if ($type eq 'Objects');
push(@types,$type);
}
closedir(DIR);
}
return if (!@types);
$SHADER_TYPES = {};
foreach my $type (@types) {
my $info = HasType($type);
next if (!$info);
$SHADER_TYPES->{$type} = $info;
}
return ReturnTypes();
}
sub ReturnTypes {
wantarray ? values(%$SHADER_TYPES) : $SHADER_TYPES;
}
# Get shader's version
# Must be able to open a hidden GL context.
sub GetTypeVersion {
my($type) = @_;
return if (!$type);
my $info = HasType($type);
return if (!$info);
return $info->{version};
}
# Check for engine availability; returns module version
sub HasType {
my($type,$min_ver,$max_ver) = @_;
return if (!$type);
my $module = GetTypeModule($type);
(my $file = $module) =~ s{::}{/}g;
require "$file.pm";
my $version = $module->can('TypeVersion')->();
my $desc = $module->can('TypeDescription')->();
return if (!$version);
return if ($min_ver && $version lt $min_ver);
return if ($max_ver && $version gt $max_ver);
my $info = {};
$info->{name} = $type;
$info->{module} = $module;
$info->{version} = $version;
$info->{description} = $desc;
return $info;
}
# Constructor wrapper for shader type
sub new {
my $this = shift;
my @types = @_ ? @_ : ('GLSL','CG','ARB');
foreach my $type (@types) {
my $module = GetTypeModule($type);
(my $file = $module) =~ s{::}{/}g;
require "$file.pm";
my $obj = $module->new;
return $obj if $obj;
}
return undef;
}
# Get shader module name
sub GetTypeModule
{
my($type) = @_;
return __PACKAGE__.'::'.uc($type);
}
1;
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