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OpenGL OpenGL: Basic Coding
1

#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>

#define TORUS 1
#define TETRAHEDRON 2
#define ICOSAHEDRON 3

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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{0xee, 0xee, 0xee, 0xee, 0x55, 0x55, 0x55, 0x55, 0xbb, 0xbb, 0xbb, 0xbb, 0x55, 0x55, 0x55, 0x55,
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{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,
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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,
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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,
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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. */
}

I have Some Doubts that need to be addressed immediately to my teacher.
Can anybody on this forum please tell me… that why
1.const Glubyte stipplemask[17][128] is used and what are these 0x00,0x88,0xaa,0x55 etc in this array.

2.what is stipple…?

please some brief explanation of this program…

I need Help Immediately … Please Help…
Thanks in advance…
Just A Brief Explanation would Be enough.

Thanks again…!! :slight_smile:

2

[QUOTE=rahulraina7;1237588]I have Some Doubts that need to be addressed immediately to my teacher.
Can anybody on this forum please tell me… that why
1.const Glubyte stipplemask[17][128] is used and what are these 0x00,0x88,0xaa,0x55 etc in this array.

2.what is stipple…?

please some brief explanation of this program…

I need Help Immediately … Please Help…
Thanks in advance…
Just A Brief Explanation would Be enough.

Thanks again…!! :)[/QUOTE]

1: It’s the pattern used for stippling, the array entries are the byte values of the mask.

2: An antik rendering option that’s deprecated.

3: A demonstration of old, deprecated rendering options you don’t need to understand if you want to learn OpenGL (only if you want to port old code to modern GL).

Also: Noone will do your homework for you (btw. if that’s your homework in 2012, I’m sad for you…)