use strict;

use ExtUtils::MakeMaker;

PDL::Core::Dev->import();

# do we build the OpenGL/OpenGLQ stuff
#  (rather than have these 2 modules do it themselves)
#
# try and find out whether we should build the OpenGL/Mesa stuff
# - first check is to dump win32 systems
#
my $gl_build = 0;
my $gl_msg = "";
my $gl_dir = "";

if ($^O =~ /win32/i) {
    $gl_msg = unsupported('PDL::Graphics::TriD::OpenGL(Q)','win32');
} else {
    #
    # default locations:
    my @check_dirs = qw( /lib/ /usr/lib/ /usr/local/lib/ /usr/X11R6/lib/ /usr/local/X11R6/lib/ /usr/X11/lib/ /usr/local/X11/lib/ );

    # append locations from perldl.conf, if specified:
    @check_dirs =
	(
	 @check_dirs,
	 grep s/^-L//g, split(' ',$PDL::Config{OPENGL_LIBS})
	 ) if defined $PDL::Config{OPENGL_LIBS};

    my $lib = ""; # Gets the first lib found...
    my @patterns = qw( GL.a GL.so GL.dll.a MesaGL.a MesaGL.so Mesa.dll.a );

    my %Ldirs = ();
    foreach my $dir (@check_dirs) {
	my $h = "${dir}/lib";

	map { if (-e "${h}$_") { $lib = "${h}$_" unless $gl_build; 
				 $Ldirs{$dir}++;} } @patterns;

	if( !$gl_build && $lib ) {
	    $gl_dir   = $dir;
	    $gl_build = 1;

	    ## Check for Mesa GLAPI hassles --CED 21-Nov-2003
	    unless( defined $PDL::Config{OPENGL_DEFINE} ) {
		$PDL::Config{OPENGL_DEFINE} = '-DGLAPI=extern'
		  if `strings $lib | grep mesa | head -1`;
	    }
	}
    }
    $PDL::Config{OPENGL_LIBS} = join(" ",(map { "-L$_" } keys %Ldirs),$PDL::Config{OPENGL_LIBS});

    $gl_msg = "skipping build of TriD::OpenGL(Q) modules - unable to find libs"
	unless $gl_build;
} # if: OS == win32

my @subdirs = qw( Rout VRML );
if ( $gl_build ) { @subdirs = ( @subdirs, qw( OpenGL OpenGLQ ) ); }
else             { print "   $gl_msg\n\n" unless $gl_build; }
$PDL::Config{GL_BUILD} = $gl_build; # record for Config.pm

WriteMakefile
    (
     NAME => "PDL::Graphics::TriD",
     'VERSION_FROM' => '../../Basic/Core/Version.pm',
     DIR => [@subdirs],
     );