Copyright Mark Kilgard 1994 Copyright 1993 Silicon Graphics Inc ALL RI

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/* Copyright (c) Mark J. Kilgard, 1994. */
/**
* (c) Copyright 1993, Silicon Graphics, Inc.
* ALL RIGHTS RESERVED
* Permission to use, copy, modify, and distribute this software for
* any purpose and without fee is hereby granted, provided that the above
* copyright notice appear in all copies and that both the copyright notice
* and this permission notice appear in supporting documentation, and that
* the name of Silicon Graphics, Inc. not be used in advertising
* or publicity pertaining to distribution of the software without specific,
* written prior permission.
*
* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
*
* US Government Users Restricted Rights
* Use, duplication, or disclosure by the Government is subject to
* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
* (c)(1)(ii) of the Rights in Technical Data and Computer Software
* clause at DFARS 252.227-7013 and/or in similar or successor
* clauses in the FAR or the DOD or NASA FAR Supplement.
* Unpublished-- rights reserved under the copyright laws of the
* United States. Contractor/manufacturer is Silicon Graphics,
* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
*
* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GL/glut.h>
GLboolean doubleBuffer;
/* ARGSUSED1 */
static void
Key(unsigned char key, int x, int y)
{
switch (key) {
case 27:
exit(0);
}
}
static void
Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
glStencilFunc(GL_ALWAYS, 1, 0);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glColor3f(0.0, 1.0, 0);
glPushMatrix();
glRotatef(45, 1, 0, 0);
glRotatef(30, 0, 1, 0);
glutSolidCube(2.5);
glPopMatrix();
/* red triangle */
glStencilFunc(GL_ALWAYS, 2, 0);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
glColor3ub(200, 0, 0);
glutSolidSphere(1.5,50,50);
/* green square */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glStencilFunc(GL_EQUAL, 1, 255);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glPushMatrix();
glRotatef(45, 1, 0, 0);
glRotatef(30, 0, 1, 0);
glutSolidCube(2.5);
glPopMatrix();
glRotated(0.1, 1, 0, 0);
glutSwapBuffers();
}
void resize(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-5, 5, -5, 5, 2, 12);
gluLookAt(0, 0, 5, 0, 0, 0, 0, 1, 0);
glMatrixMode(GL_MODELVIEW);
}
static void Args(int argc, char **argv)
{
GLint i;
doubleBuffer = GL_TRUE;
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;
}
}
}
int
main(int argc, char **argv)
{
GLenum type;
float pos[4] = { 3, 3, 3, 1 };
float dir[3] = { -1, -1, -1 };
GLfloat mat_specular[] = { 1, 1, 1, 1 };
glutInit(&argc, argv);
Args(argc, argv);
type = GLUT_RGB | GLUT_STENCIL;
type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
glutInitDisplayMode(type);
glutCreateWindow("Stencil Test");
glEnable(GL_DEPTH_TEST);
glEnable(GL_COLOR_MATERIAL);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glLightfv(GL_LIGHT0, GL_POSITION, pos);
glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, dir);
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
glMaterialf(GL_FRONT, GL_SHININESS, 128.0);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearStencil(0);
glStencilMask(1);
glEnable(GL_STENCIL_TEST);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-5.0, 5.0, -5.0, 5.0, -5.0, 5.0);
glMatrixMode(GL_MODELVIEW);
glutKeyboardFunc(Key);
glutDisplayFunc(Draw);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}