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|
/* Copyright (c) Mark J. Kilgard, 1996. */
/* This program is freely distributable without licensing fees
and is provided without guarantee or warrantee expressed or
implied. This program is -not- in the public domain. */
/* screendoor demonstrates "screen door" transparency using
OpenGL's polygon stipple feature. */
#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>
#define TORUS 1
#define TETRAHEDRON 2
#define ICOSAHEDRON 3
/* Screen door transparency stipple patterns, originally generated by
Tim Hall (tjh@world.std.com) based on the 4x4 dither matrix
described in "Computer Graphics Principles and Practice, 2nd ed." in
the "Halftone Approximation" section (13.1.2). Each 4x4 pattern is
replicated over OpenGL's 32x32 pixel stipple pattern. mjk converted
Tim's patterns to be expressed as GLubytes instead of unsigned ints
to avoid byte ordering problems. */
#if 0 /* Comment containing C comments. */
Example usage:
/* Assumes default unpack pixel store settings; see glPixelStore */
glEnable(GL_POLYGON_STIPPLE);
glPolygonStipple(stippleMask[0]); /* 0% opaqueness */
glPolygonStipple(stippleMask[8]); /* 50% opaqueness */
glPolygonStipple(stippleMask[16]); /* 100% opaqueness */
#endif
const GLubyte stippleMask[17][128] =
{
/* NOTE: 0% opaqueness is faster to set and probably faster to render with:
glDisable(GL_POLYGON_STIPPLE);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); */
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0x88, 0x88, 0x88, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00,
0x88, 0x88, 0x88, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00,
0x88, 0x88, 0x88, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00,
0x88, 0x88, 0x88, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00,
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0x88, 0x88, 0x88, 0x88, 0x00, 0x00, 0x00, 0x00, 0x22, 0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00},
{0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, 0x22, 0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00,
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0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, 0x22, 0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00,
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0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00, 0x22, 0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00},
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0xaa, 0xaa, 0xaa, 0xaa, 0x44, 0x44, 0x44, 0x44, 0xaa, 0xaa, 0xaa, 0xaa, 0x00, 0x00, 0x00, 0x00},
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0xaa, 0xaa, 0xaa, 0xaa, 0x44, 0x44, 0x44, 0x44, 0xaa, 0xaa, 0xaa, 0xaa, 0x11, 0x11, 0x11, 0x11},
{0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x11, 0x11, 0x11, 0x11,
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0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x11, 0x11, 0x11, 0x11,
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0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55,
0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xaa, 0x55, 0x55, 0x55, 0x55},
{0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
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0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55},
{0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55},
{0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55},
{0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x55, 0x55, 0x55, 0x55},
{0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xdd, 0xdd, 0xdd, 0xdd, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77},
{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x77, 0x77, 0x77, 0x77},
/* NOTE: 100% opaqueness is faster to set and probably faster to render with:
glDisable(GL_POLYGON_STIPPLE); */
{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff},
};
GLfloat angle = 20.0;
int torusStipple = 4, icoStipple = 8, tetraStipple = 16;
/* Initialize material property and light source. */
void
myinit(void)
{
GLfloat light_ambient[] =
{0.2, 0.2, 0.2, 1.0};
GLfloat light_diffuse[] =
{1.0, 1.0, 1.0, 1.0};
GLfloat light_specular[] =
{1.0, 1.0, 1.0, 1.0};
GLfloat light_position[] =
{1.0, 1.0, 1.0, 0.0};
glClearColor(0.49, 0.62, 0.75, 0.0);
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable(GL_LIGHT0);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_CULL_FACE);
glEnable(GL_POLYGON_STIPPLE);
glNewList(TORUS, GL_COMPILE);
glutSolidTorus(0.275, 0.85, 10, 15);
glEndList();
glNewList(TETRAHEDRON, GL_COMPILE);
glutSolidTetrahedron();
glEndList();
glNewList(ICOSAHEDRON, GL_COMPILE);
glutSolidIcosahedron();
glEndList();
}
void
display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glScalef(1.3, 1.3, 1.3);
glRotatef(angle, 1.0, 0.0, 0.0);
glPushMatrix();
glTranslatef(-0.75, -0.5, 0.0);
glRotatef(270.0, 1.0, 0.0, 0.0);
glPolygonStipple(stippleMask[tetraStipple]);
glCallList(TETRAHEDRON);
glPopMatrix();
glPushMatrix();
glTranslatef(-0.75, 0.5, 0.0);
glRotatef(90.0, 1.0, 0.0, 0.0);
glPolygonStipple(stippleMask[torusStipple]);
glCallList(TORUS);
glPopMatrix();
glPushMatrix();
glTranslatef(0.75, 0.0, -1.0);
glPolygonStipple(stippleMask[icoStipple]);
glCallList(ICOSAHEDRON);
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
void
reshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w <= h)
glOrtho(-2.5, 2.5, -2.5 * (GLfloat) h / (GLfloat) w,
2.5 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
else
glOrtho(-2.5 * (GLfloat) w / (GLfloat) h,
2.5 * (GLfloat) w / (GLfloat) h, -2.5, 2.5, -10.0, 10.0);
glMatrixMode(GL_MODELVIEW);
}
void
torusTransparency(int value)
{
torusStipple = value;
glutPostRedisplay();
}
void
icoTransparency(int value)
{
icoStipple = value;
glutPostRedisplay();
}
void
tetraTransparency(int value)
{
tetraStipple = value;
glutPostRedisplay();
}
void
noop(int value)
{
switch(value) {
case 1:
angle -= 45;
break;
case 2:
angle += 45;
break;
case 666:
exit(0);
}
glutPostRedisplay();
}
void
createTransparencyMenu(void)
{
char label[20];
int i;
for (i = 0; i < 17; i++) {
sprintf(label, "%d%% opaque", i * 100 / 16);
glutAddMenuEntry(label, i);
}
}
int
main(int argc, char **argv)
{
int torusMenu, icoMenu, tetraMenu;
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutCreateWindow("screen door transparency");
glutDisplayFunc(display);
glutReshapeFunc(reshape);
myinit();
torusMenu = glutCreateMenu(torusTransparency);
createTransparencyMenu();
icoMenu = glutCreateMenu(icoTransparency);
createTransparencyMenu();
tetraMenu = glutCreateMenu(tetraTransparency);
createTransparencyMenu();
glutCreateMenu(noop);
glutAddSubMenu("Torus", torusMenu);
glutAddSubMenu("Icosahedron", icoMenu);
glutAddSubMenu("Tetrahedron", tetraMenu);
glutAddMenuEntry("Rotate up", 1);
glutAddMenuEntry("Rotate down", 2);
glutAddMenuEntry("Quit", 666);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
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