| mmmmtmmmm |
09-04-2007 03:33 AM |
Perl - SDL::OpenGL is not displaying graphics
I am trying to run some Perl code that I found in a 3d graphics tutorial. It is supposed to create a window and display a blue cube in it. It is opening up the window, but is not displaying anything inside of it -- it's just black the whole time. Is there anything that you all can see that would make it not display? I am not getting any error messages. Here is the code:
Code:
#!/usr/bin/perl -w
use strict;
use SDL::App;
use SDL::OpenGL;
my ($done, $frame);
START: main();
sub main{
init();
main_loop();
cleanup();
}
sub init{
$| = 1;
init_conf();
init_window();
}
sub main_loop{
while (not $done) {
$frame++;
do_frame();
}
}
#config hash and SDL::App object
my ($conf, $sdl_app);
#Configuration for SDL::App Window created in init_window()
sub init_conf{
$conf = {
title => 'Camel 3D',
width => 400,
height => 400,
fovy => 90,
};
}
#Creates an SDL::App object using values from init_conf()
sub init_window{
my ($title, $w, $h) = @$conf{qw( title width height )};
$sdl_app = SDL::App->new(-title => $title,
-width => $w,
-height => $h,
-gl => 1,
);
SDL::ShowCursor(0); #Toggles whether cursor appears in window
}
sub do_frame{
prep_frame();
draw_frame();
end_frame();
}
sub prep_frame{
glClear(GL_COLOR_BUFFER_BIT);
}
sub draw_frame{
set_projection_3d();
set_view_3d();
draw_view();
print '.';
sleep 1;
$done = 1 if $frame == 5;
}
sub set_projection_3d{
my ($fovy, $w, $h) = @$conf{qw( fovy width height )};
my $aspect = $w / $h;
glMatrixMode(GL_PROJECTION);
glLoadIdentity;
gluPerspective($fovy, $aspect, 1, 1000);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity;
}
sub set_view_3d
{
# Move the viewpoint so we can see the origin
glTranslate(0, -2, -10);
}
sub draw_view{
draw_cube();
}
sub draw_cube
{
# A simple cube
my @indices = qw( 4 5 6 7 1 2 6 5 0 1 5 4
0 3 2 1 0 4 7 3 2 3 7 6 );
my @vertices = ([-1, -1, -1], [ 1, -1, -1],
[ 1, 1, -1], [-1, 1, -1],
[-1, -1, 1], [ 1, -1, 1],
[ 1, 1, 1], [-1, 1, 1]);
glBegin(GL_QUADS);
foreach my $face (0 .. 5) {
foreach my $vertex (0 .. 3) {
my $index = $indices[4 * $face + $vertex];
my $coords = $vertices[$index];
glVertex(@$coords);
}
}
glEnd;
}
sub end_frame{
$sdl_app->sync;
}
sub cleanup{
print "\nDone.\n";
}
I would really appreciate any help you all can give me.
Thanks,
mmmmtmmmm |
