160 lines
5.1 KiB
C
160 lines
5.1 KiB
C
/*
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* (c) Copyright 1993, Silicon Graphics, Inc.
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* ALL RIGHTS RESERVED
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* Permission to use, copy, modify, and distribute this software for
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* any purpose and without fee is hereby granted, provided that the above
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* copyright notice appear in all copies and that both the copyright notice
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* and this permission notice appear in supporting documentation, and that
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* the name of Silicon Graphics, Inc. not be used in advertising
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* or publicity pertaining to distribution of the software without specific,
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* written prior permission.
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*
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* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
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* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
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* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
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* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
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* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
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* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
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* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
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* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* US Government Users Restricted Rights
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* Use, duplication, or disclosure by the Government is subject to
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* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
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* (c)(1)(ii) of the Rights in Technical Data and Computer Software
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* clause at DFARS 252.227-7013 and/or in similar or successor
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* clauses in the FAR or the DOD or NASA FAR Supplement.
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* Unpublished-- rights reserved under the copyright laws of the
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* United States. Contractor/manufacturer is Silicon Graphics,
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* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
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*
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* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
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*/
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/* stencil.c
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* This program draws two rotated tori in a window.
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* A diamond in the center of the window masks out part
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* of the scene. Within this mask, a different model
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* (a sphere) is drawn in a different color.
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*/
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#include <windows.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include "glaux.h"
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#define YELLOWMAT 1
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#define BLUEMAT 2
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void myinit (void)
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{
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GLfloat yellow_diffuse[] = { 0.7, 0.7, 0.0, 1.0 };
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GLfloat yellow_specular[] = { 1.0, 1.0, 1.0, 1.0 };
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GLfloat blue_diffuse[] = { 0.1, 0.1, 0.7, 1.0 };
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GLfloat blue_specular[] = { 0.1, 1.0, 1.0, 1.0 };
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GLfloat position_one[] = { 1.0, 1.0, 1.0, 0.0 };
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glNewList(YELLOWMAT, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_DIFFUSE, yellow_diffuse);
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glMaterialfv(GL_FRONT, GL_SPECULAR, yellow_specular);
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glMaterialf(GL_FRONT, GL_SHININESS, 64.0);
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glEndList();
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glNewList(BLUEMAT, GL_COMPILE);
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glMaterialfv(GL_FRONT, GL_DIFFUSE, blue_diffuse);
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glMaterialfv(GL_FRONT, GL_SPECULAR, blue_specular);
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glMaterialf(GL_FRONT, GL_SHININESS, 45.0);
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glEndList();
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glLightfv(GL_LIGHT0, GL_POSITION, position_one);
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glEnable(GL_LIGHT0);
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glEnable(GL_LIGHTING);
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glDepthFunc(GL_LESS);
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glEnable(GL_DEPTH_TEST);
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glClearStencil(0x0);
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glEnable(GL_STENCIL_TEST);
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}
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/* Draw a sphere in a diamond-shaped section in the
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* middle of a window with 2 tori.
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*/
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void display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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/* draw blue sphere where the stencil is 1 */
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glStencilFunc (GL_EQUAL, 0x1, 0x1);
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glCallList (BLUEMAT);
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auxSolidSphere (0.5);
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/* draw the tori where the stencil is not 1 */
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glStencilFunc (GL_NOTEQUAL, 0x1, 0x1);
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glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP);
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glPushMatrix();
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glRotatef (45.0, 0.0, 0.0, 1.0);
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glRotatef (45.0, 0.0, 1.0, 0.0);
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glCallList (YELLOWMAT);
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auxSolidTorus (0.275, 0.85);
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glPushMatrix();
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glRotatef (90.0, 1.0, 0.0, 0.0);
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auxSolidTorus (0.275, 0.85);
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glPopMatrix();
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glPopMatrix();
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glFlush();
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}
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/* Whenever the window is reshaped, redefine the
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* coordinate system and redraw the stencil area.
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*/
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void myReshape(GLsizei w, GLsizei h)
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{
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glViewport(0, 0, w, h);
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glClear(GL_STENCIL_BUFFER_BIT);
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/* create a diamond shaped stencil area */
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-3.0, 3.0, -3.0, 3.0, -1.0, 1.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glStencilFunc (GL_ALWAYS, 0x1, 0x1);
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glStencilOp (GL_REPLACE, GL_REPLACE, GL_REPLACE);
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glBegin(GL_QUADS);
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glVertex3f (-1.0, 0.0, 0.0);
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glVertex3f (0.0, 1.0, 0.0);
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glVertex3f (1.0, 0.0, 0.0);
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glVertex3f (0.0, -1.0, 0.0);
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glEnd();
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(45.0, (GLfloat) w/(GLfloat) h, 3.0, 7.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0.0, 0.0, -5.0);
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}
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/* Main Loop
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* Open window with initial window size, title bar,
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* RGBA display mode, and handle input events.
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*/
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int main(int argc, char** argv)
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{
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auxInitDisplayMode (AUX_SINGLE | AUX_RGB
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| AUX_DEPTH16 | AUX_STENCIL);
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auxInitPosition (0, 0, 400, 400);
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auxInitWindow (argv[0]);
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myinit ();
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auxReshapeFunc (myReshape);
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auxMainLoop(display);
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}
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