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#!/usr/bin/env perl
use SDL;
use SDL::App;
use SDL::Surface;
use SDL::Event;
use SDL::OpenGL;
#for ( keys %main:: ) {
# print "$_\n";
#}
print "Starting $0\n";
my $app = new SDL::App -w => 800, -h => 600, -d => 16, -gl => 1;
print "Initializing OpenGL settings\n";
printf "%-24s%s\n", "GL_RED_SIZE ", $app->attribute( SDL_GL_RED_SIZE() );
printf "%-24s%s\n", "GL_GREEN_SIZE ", $app->attribute( SDL_GL_GREEN_SIZE());
printf "%-24s%s\n", "GL_BLUE_SIZE ", $app->attribute( SDL_GL_BLUE_SIZE() );
printf "%-24s%s\n", "GL_DEPTH_SIZE ", $app->attribute( SDL_GL_DEPTH_SIZE() );
printf "%-24s%s\n", "GL_DOUBLEBUFFER ", $app->attribute( SDL_GL_DOUBLEBUFFER() );
sub DrawScene {
glClear( GL_DEPTH_BUFFER_BIT()
| GL_COLOR_BUFFER_BIT());
glLoadIdentity();
glTranslate(-1.5,0,-6);
glColor(1,1,1);
glBegin(GL_TRIANGLES());
glColor(1,0,0) if (@_);
glVertex(0,1,0);
glColor(0,1,0) if (@_);
glVertex(-1,-1,0);
glColor(0,0,1) if (@_);
glVertex(1,-1,0);
glEnd();
glTranslate(3,0,0);
glBegin(GL_QUADS());
glColor(1,0,0) if (@_);
glVertex(-1,1,0);
glColor(0,1,0) if (@_);
glVertex(1,1,0);
glColor(0,0,1) if (@_);
glVertex(1,-1,0);
glColor(1,1,0) if (@_);
glVertex(-1,-1,0);
glEnd();
}
sub DrawColorScene {
DrawScene 'with color';
}
sub InitView {
glViewport(0,0,800,600);
glMatrixMode(GL_PROJECTION());
glLoadIdentity();
if ( @_ ) {
glPerspective(45.0,4/3,0.1,100.0);
} else {
glFrustum(-0.1,0.1,-0.075,0.075,0.175,100.0);
}
glMatrixMode(GL_MODELVIEW());
glLoadIdentity();
}
InitView();
DrawScene();
$app->sync();
$toggle = 1;
$app->loop( {
SDL_QUIT() => sub { exit(0); },
SDL_KEYDOWN() => sub { $toggle = ($toggle) ? 0 : 1;
($toggle) ? DrawScene() : DrawColorScene();
$app->sync();
},
} );
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