diff options
Diffstat (limited to 'progs/redbook/plane.c')
| -rw-r--r-- | progs/redbook/plane.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/progs/redbook/plane.c b/progs/redbook/plane.c new file mode 100644 index 00000000000..2b0cca06faf --- /dev/null +++ b/progs/redbook/plane.c @@ -0,0 +1,157 @@ + +/* 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 + * Unpublished-- rights reserved under the copyright laws of the + * United States.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. + */ +/* + * plane.c + * This program demonstrates the use of local versus + * infinite lighting on a flat plane. + */ +#include <stdlib.h> +#include <GL/glut.h> + +/* Initialize material property, light source, and lighting model. + */ +void myinit(void) +{ + GLfloat mat_ambient[] = { 0.0, 0.0, 0.0, 1.0 }; +/* mat_specular and mat_shininess are NOT default values */ + GLfloat mat_diffuse[] = { 0.4, 0.4, 0.4, 1.0 }; + GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 }; + GLfloat mat_shininess[] = { 15.0 }; + + GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 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 lmodel_ambient[] = { 0.2, 0.2, 0.2, 1.0 }; + + glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient); + glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse); + glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular); + glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess); + glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient); + glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse); + glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular); + glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient); + + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + glDepthFunc(GL_LESS); + glEnable(GL_DEPTH_TEST); +} + +void drawPlane(void) +{ + glBegin (GL_QUADS); + glNormal3f (0.0, 0.0, 1.0); + glVertex3f (-1.0, -1.0, 0.0); + glVertex3f (0.0, -1.0, 0.0); + glVertex3f (0.0, 0.0, 0.0); + glVertex3f (-1.0, 0.0, 0.0); + + glNormal3f (0.0, 0.0, 1.0); + glVertex3f (0.0, -1.0, 0.0); + glVertex3f (1.0, -1.0, 0.0); + glVertex3f (1.0, 0.0, 0.0); + glVertex3f (0.0, 0.0, 0.0); + + glNormal3f (0.0, 0.0, 1.0); + glVertex3f (0.0, 0.0, 0.0); + glVertex3f (1.0, 0.0, 0.0); + glVertex3f (1.0, 1.0, 0.0); + glVertex3f (0.0, 1.0, 0.0); + + glNormal3f (0.0, 0.0, 1.0); + glVertex3f (0.0, 0.0, 0.0); + glVertex3f (0.0, 1.0, 0.0); + glVertex3f (-1.0, 1.0, 0.0); + glVertex3f (-1.0, 0.0, 0.0); + glEnd(); +} + +void display (void) +{ + GLfloat infinite_light[] = { 1.0, 1.0, 1.0, 0.0 }; + GLfloat local_light[] = { 1.0, 1.0, 1.0, 1.0 }; + + glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + glPushMatrix (); + glTranslatef (-1.5, 0.0, 0.0); + glLightfv (GL_LIGHT0, GL_POSITION, infinite_light); + drawPlane (); + glPopMatrix (); + + glPushMatrix (); + glTranslatef (1.5, 0.0, 0.0); + glLightfv (GL_LIGHT0, GL_POSITION, local_light); + drawPlane (); + glPopMatrix (); + glFlush (); +} + +void myReshape(int w, int h) +{ + glViewport (0, 0, w, h); + glMatrixMode (GL_PROJECTION); + glLoadIdentity (); + if (w <= h) + glOrtho (-1.5, 1.5, -1.5*(GLdouble)h/(GLdouble)w, + 1.5*(GLdouble)h/(GLdouble)w, -10.0, 10.0); + else + glOrtho (-1.5*(GLdouble)w/(GLdouble)h, + 1.5*(GLdouble)w/(GLdouble)h, -1.5, 1.5, -10.0, 10.0); + glMatrixMode (GL_MODELVIEW); +} + +/* Main Loop + * Open window with initial window size, title bar, + * RGBA display mode, and handle input events. + */ +int main(int argc, char** argv) +{ + glutInit(&argc, argv); + glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); + glutInitWindowSize (500, 200); + glutCreateWindow (argv[0]); + myinit(); + glutReshapeFunc (myReshape); + glutDisplayFunc(display); + glutMainLoop(); + return 0; /* ANSI C requires main to return int. */ +} |