/usr/share/doc/libopengl-perl/examples/plane.pl is in libopengl-perl 0.6704+dfsg-2build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 | #!/usr/bin/perl
#
# plane
# This program demonstrates the use of local versus
# infinite lighting on a flat plane.
# Adapted from book "OpenGL Programming Guide"
#
BEGIN{ unshift(@INC,"../blib"); } # in case OpenGL is built but not installed
BEGIN{ unshift(@INC,"../blib/arch"); } # 5.002 gamma needs this
BEGIN{ unshift(@INC,"../blib/lib"); } # 5.002 gamma needs this
use OpenGL;
# Initialize material property, light source, and lighting model.
sub myinit{
# mat_specular and mat_shininess are NOT default values
# Its important not to make a mistake on the packing
# there's no type checking for C pointer arguments
$mat_ambient = pack("f4", 0.0, 0.0, 0.0, 1.0 );
$mat_diffuse = pack("f4", 0.4, 0.4, 0.4, 1.0 );
$mat_specular = pack("f4", 1.0, 1.0, 1.0, 1.0 );
$mat_shininess = 15.0 ;
$light_ambient = pack("f4", 0.0, 0.0, 0.0, 1.0 );
$light_diffuse = pack("f4", 1.0, 1.0, 1.0, 1.0 );
$light_specular = pack("f4", 1.0, 1.0, 1.0, 1.0 );
$lmodel_ambient = pack("f4", 0.2, 0.2, 0.2, 1.0 );
glMaterialfv(GL_FRONT, GL_AMBIENT, $mat_ambient);
glMaterialfv(GL_FRONT, GL_DIFFUSE, $mat_diffuse);
glMaterialfv(GL_FRONT, GL_SPECULAR, $mat_specular);
glMaterialf(GL_FRONT, GL_SHININESS, $mat_shininess);
glLightfv(GL_LIGHT0, GL_AMBIENT, $light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, $light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, $light_specular);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, $lmodel_ambient);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
}
sub drawPlane {
glBegin (GL_QUADS);
glNormal3f (0.0, 0.0, 1.0);
glVertex3f (-1.0, -1.0, 0.0);
glVertex3f (0.0, -1.0, 0.0);
glVertex3f (0.0, 0.0, 0.0);
glVertex3f (-1.0, 0.0, 0.0);
glNormal3f (0.0, 0.0, 1.0);
glVertex3f (0.0, -1.0, 0.0);
glVertex3f (1.0, -1.0, 0.0);
glVertex3f (1.0, 0.0, 0.0);
glVertex3f (0.0, 0.0, 0.0);
glNormal3f (0.0, 0.0, 1.0);
glVertex3f (0.0, 0.0, 0.0);
glVertex3f (1.0, 0.0, 0.0);
glVertex3f (1.0, 1.0, 0.0);
glVertex3f (0.0, 1.0, 0.0);
glNormal3f (0.0, 0.0, 1.0);
glVertex3f (0.0, 0.0, 0.0);
glVertex3f (0.0, 1.0, 0.0);
glVertex3f (-1.0, 1.0, 0.0);
glVertex3f (-1.0, 0.0, 0.0);
glEnd();
}
sub display {
$infinite_light = pack("f4", 1.0, 1.0, 1.0, 0.0 );
$local_light = pack("f4", 1.0, 1.0, 1.0, 1.0 );
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix ();
glTranslatef (-1.5, 0.0, 0.0);
glLightfv (GL_LIGHT0, GL_POSITION, $infinite_light);
drawPlane ();
glPopMatrix ();
glPushMatrix ();
glTranslatef (1.5, 0.0, 0.0);
glLightfv (GL_LIGHT0, GL_POSITION, $local_light);
drawPlane ();
glPopMatrix ();
glpFlush ();
}
sub myReshape{
# glViewport (0, 0, w, h);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
glOrtho (-3.0, 3.0, -3.0, 3.0, -10.0, 10.0);
glMatrixMode (GL_MODELVIEW);
}
# use optional 3rd argument to glpOpenWindow to indicate
# what is needed for the visual just rgb (no double buffer).
glpOpenWindow;
myinit();
myReshape;
display;
glpMainLoop;
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