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#!/usr/bin/perl -w
use OpenGL qw(:all);
$speed_test = GL_FALSE;
$use_vertex_arrays = GL_TRUE;
$doubleBuffer = GL_TRUE;
$smooth = GL_TRUE;
$lighting = GL_TRUE;
$light0 = GL_TRUE;
$light1 = GL_TRUE;
$MAXVERTS = 10000;
$verts = new OpenGL::Array $MAXVERTS * 3, GL_FLOAT;
$norms = new OpenGL::Array $MAXVERTS * 3, GL_FLOAT;
$numverts = 0;
$xrot=0;
$yrot=0;
sub read_surface_dat {
my ($filename) = @_;
open(F, "<$filename") || die "couldn't read $filename\n";
$numverts = 0;
while ($numverts < $MAXVERTS and defined($_ = <F>)) {
chop;
@d = split(/\s+/, $_);
$verts->assign($numverts*3, @d[0..2]);
$norms->assign($numverts*3, @d[3..5]);
$numverts++;
}
$numverts--;
printf "%d vertices, %d triangles\n", $numverts, $numverts-2;
close(F);
}
sub read_surface_bin {
my ($filename) = @_;
open(F, "<$filename") || die "couldn't read $filename\n";
binmode(F);
$numverts = 0;
while ($numverts < $MAXVERTS and read(F, $_, 12)==12) {
@d = map(($_-32000) / 10000 , unpack("nnnnnn", $_));
$verts->assign($numverts*3, @d[0..2]);
$norms->assign($numverts*3, @d[3..5]);
$numverts++;
}
$numverts--;
printf "%d vertices, %d triangles\n", $numverts, $numverts-2;
close(F);
}
sub draw_surface {
my ($i);
# glDrawArrays(GL_TRIANGLE_STRIP, 0, $numverts);
if ($use_vertex_arrays) {
glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, $numverts );
}
else {
glBegin( GL_TRIANGLE_STRIP );
for ($i=0;$i<$numverts;$i++) {
glNormal3d( $norms->retrieve($i*3, 3) );
glVertex3d( $verts->retrieve($i*3, 3) );
}
glEnd();
}
}
sub draw1 {
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glPushMatrix();
glRotated( $yrot, 0.0, 1.0, 0.0 );
glRotated( $xrot, 1.0, 0.0, 0.0 );
draw_surface();
glPopMatrix();
glFlush();
if ($doubleBuffer) {
glutSwapBuffers();
}
}
sub Draw {
if ($speed_test) {
for ($xrot=0.0;$xrot<=360.0;$xrot+=10.0) {
draw1();
}
MyExit(0);
}
else {
draw1();
}
}
sub InitMaterials {
my(@ambient) = (0.1, 0.1, 0.1, 1.0);
my(@diffuse) = (0.5, 1.0, 1.0, 1.0);
my (@position0) = (0.0, 0.0, 20.0, 0.0);
my (@position1) = (0.0, 0.0, -20.0, 0.0);
my (@front_mat_shininess) = (60.0);
my (@front_mat_specular) = (0.2, 0.2, 0.2, 1.0);
my (@front_mat_diffuse) = (0.5, 0.28, 0.38, 1.0);
# /*
# my (@back_mat_shininess) = (60.0);
# my (@back_mat_specular) = (0.5, 0.5, 0.2, 1.0);
# my (@back_mat_diffuse) = (1.0, 1.0, 0.2, 1.0);
# */
my (@lmodel_ambient) = (1.0, 1.0, 1.0, 1.0);
my (@lmodel_twoside) = (GL_FALSE);
glLightfv_p(GL_LIGHT0, GL_AMBIENT, @ambient);
glLightfv_p(GL_LIGHT0, GL_DIFFUSE, @diffuse);
glLightfv_p(GL_LIGHT0, GL_POSITION, @position0);
glEnable(GL_LIGHT0);
glLightfv_p(GL_LIGHT1, GL_AMBIENT, @ambient);
glLightfv_p(GL_LIGHT1, GL_DIFFUSE, @diffuse);
glLightfv_p(GL_LIGHT1, GL_POSITION, @position1);
glEnable(GL_LIGHT1);
glLightModelfv_p(GL_LIGHT_MODEL_AMBIENT, @lmodel_ambient);
glLightModelfv_p(GL_LIGHT_MODEL_TWO_SIDE, @lmodel_twoside);
glEnable(GL_LIGHTING);
glMaterialfv_p(GL_FRONT_AND_BACK, GL_SHININESS, @front_mat_shininess);
glMaterialfv_p(GL_FRONT_AND_BACK, GL_SPECULAR, @front_mat_specular);
glMaterialfv_p(GL_FRONT_AND_BACK, GL_DIFFUSE, @front_mat_diffuse);
}
sub Init {
glClearColor(0.0, 0.0, 0.0, 0.0);
glShadeModel(GL_SMOOTH);
glEnable(GL_DEPTH_TEST);
InitMaterials();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 5, 25 );
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslated( 0.0, 0.0, -6.0 );
# glVertexPointer_a( 3, GL_FLOAT, 0, $verts );
# glNormalPointer_a( GL_FLOAT, 0, $norms );
# glEnable( GL_VERTEX_ARRAY );
# glEnable( GL_NORMAL_ARRAY );
if ($use_vertex_arrays) {
glVertexPointerEXT_c( 3, GL_FLOAT, 0, $numverts, $verts->ptr );
glNormalPointerEXT_c( GL_FLOAT, 0, $numverts, $norms->ptr );
glEnable( GL_VERTEX_ARRAY_EXT );
glEnable( GL_NORMAL_ARRAY_EXT );
}
}
sub Reshape {
my ($width, $height) = @_;
glViewport(0, 0, $width, $height);
}
sub Key {
my ($key, $x, $y ) = @_;
if ($key == 27 or $key == ord 'q' or $key == ord 'Q') {
MyExit();
} elsif ($key == ord('s')) {
$smooth = !$smooth;
if ($smooth) {
glShadeModel(GL_SMOOTH);
} else {
glShadeModel(GL_FLAT);
}
} elsif ($key == ord('0')) {
$light0 = !$light0;
if ($light0) {
glEnable(GL_LIGHT0);
} else {
glDisable(GL_LIGHT0);
}
} elsif ($key == ord('1')) {
$light1 = !$light1;
if ($light1) {
glEnable(GL_LIGHT1);
} else {
glDisable(GL_LIGHT1);
}
} elsif ($key == ord('l')) {
$lighting = !$lighting;
if ($lighting) {
glEnable(GL_LIGHTING);
} else {
glDisable(GL_LIGHTING);
}
} else {
return;
}
glutPostRedisplay();
}
sub SpecialKey {
my ($key, $x, $y ) = @_;
if ($key == GLUT_KEY_LEFT) {
$yrot -= 15.0;
} elsif ($key == GLUT_KEY_RIGHT) {
$yrot += 15.0;
} elsif ($key == GLUT_KEY_UP) {
$xrot += 15.0;
} elsif ($key == GLUT_KEY_DOWN) {
$xrot -= 15.0;
} else {
return;
}
glutPostRedisplay();
}
#sub Args(int argc, char **argv)
#{
# GLint i;
#
# for (i = 1; i < argc; i++) {
# if (strcmp(argv[i], "-sb") == 0) {
# doubleBuffer = GL_FALSE;
# }
# else if (strcmp(argv[i], "-db") == 0) {
# doubleBuffer = GL_TRUE;
# }
# else if (strcmp(argv[i], "-speed") == 0) {
# speed_test = GL_TRUE;
# doubleBuffer = GL_TRUE;
# }
# else if (strcmp(argv[i], "-va") == 0) {
# use_vertex_arrays = GL_TRUE;
# }
# else {
# printf("%s (Bad option).\n", argv[i]);
# return GL_FALSE;
# }
# }
#
# return GL_TRUE;
#}
my $WindowId;
#int main(int argc, char **argv)
#{
# GLenum type;
# char *extensions;
read_surface_bin( "isosurf.bin" );
# if (Args(argc, argv) == GL_FALSE) {
# exit(0);
# }
glutInit();
glutInitWindowPosition(0, 0);
glutInitWindowSize(400, 400);
$type = GLUT_DEPTH;
$type |= GLUT_RGB;
$type |= ($doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
glutInitDisplayMode($type);
if (($WindowId = glutCreateWindow("Isosurface")) <= 0) {
exit(0);
}
# /* Make sure server supports the vertex array extension */
# $extensions = glGetString( GL_EXTENSIONS );
# if ($extensions !~ /\bGL_EXT_vertex_array\b/
# or OpenGL::_have_glp and not OpenGL::_have_glx and 0) { # OS/2 reports wrong
# $use_vertex_arrays = GL_FALSE;
# }
# print "Extensions: '$extensions'.\n";
if (defined &OpenGL::glVertexPointerEXT_c) {
print "Using Vertex Array...\n";
} else {
print "No Vertex Array extension found, using a slow method...\n";
$use_vertex_arrays = 0;
}
Init();
glutReshapeFunc(\&Reshape);
glutKeyboardFunc(\&Key);
glutSpecialFunc(\&SpecialKey);
glutDisplayFunc(\&Draw);
glutMainLoop();
# This leaves GLUT running (at least under OS/2...).
#sub MyExit {
# exit shift if $WindowId <= 0;
# glutDestroyWindow($WindowId);
# warn "Exiting...\n";
#}
sub MyExit { exit } # Segfaults under OS/2...
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