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############################################################
#
# OpenGL::Shader::CG - 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.
#
############################################################
package OpenGL::Shader::CG;
use Carp;
use strict;
use warnings;
our $VERSION = '1.01';
our $SHADER_VER;
our $DESCRIPTION = qq
{nVidia's Cg Shader Language};
use OpenGL::Shader::Objects;
our @ISA = qw(OpenGL::Shader::Objects);
use OpenGL(':all');
=head1 NAME
OpenGL::Shader::CG - plug-in module for use with OpenGL::Shader
=head1 SYNOPSIS
##########
# Instantiate a shader
use OpenGL::Shader;
my $shdr = OpenGL::Shader->new('CG');
# See docs in OpenGL/Shader/Common.pm
=head1 DESCRIPTION
This is a plug-in module for use with the OpenGL::Shader.
While it may be called directly, it will more often be called
by the OpenGL::Shader abstraction module.
This is a subclass of the OpenGL::Shader::Objects module.
=head1 AUTHOR
Bob "grafman" Free - grafman@graphcomp.com.
Copyright 2007 Graphcomp - ALL RIGHTS RESERVED
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=cut
# Get Version
sub TypeVersion
{
if (!defined($SHADER_VER))
{
return undef if (OpenGL::glpCheckExtension('GL_EXT_Cg_shader'));
# Get GL_SHADING_LANGUAGE_VERSION_ARB
my $ver = glGetString(0x8B8C);
$ver =~ m|Cg ([\d\.]+)|i;
# Some drivers do not report Cg version
$SHADER_VER = $1 || '1.00';
}
return $SHADER_VER;
}
# Get Description
sub TypeDescription
{
return $DESCRIPTION;
}
# Shader constructor
sub new
{
my $this = shift;
my $class = ref($this) || $this;
# Check for additional required OpenGL extensions
my $ver = TypeVersion();
return undef if (!$ver);
my $self = OpenGL::Shader::Objects->new(@_);
return undef if (!$self);
bless($self,$class);
$self->{type} = 'CG';
$self->{version} = $ver;
$self->{description} = $DESCRIPTION;
$self->{fragment_const} = GL_CG_FRAGMENT_SHADER_EXT;
$self->{vertex_const} = GL_CG_VERTEX_SHADER_EXT;
return $self;
}
1;
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