334 lines
8.8 KiB
C
334 lines
8.8 KiB
C
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/*
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* Copyright (c) 1993-1997, 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(R) is a registered trademark of Silicon Graphics, Inc.
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*/
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/*
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* polyoff.c
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* This program demonstrates polygon offset to draw a shaded
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* polygon and its wireframe counterpart without ugly visual
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* artifacts ("stitching").
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*/
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#include <GL/glut.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef GL_VERSION_1_1
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GLuint list;
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GLint fill = 1;
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GLfloat spinx = 0;
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GLfloat spiny = 0;
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GLfloat tdist = 0.0;
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GLfloat polyfactor = 1.0;
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GLfloat polyunits = 1.0;
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GLboolean doubleBuffer;
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/* display() draws two spheres, one with a gray, diffuse material,
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* the other sphere with a magenta material with a specular highlight.
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*/
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void display (void)
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{
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GLfloat gray[] = { 0.8, 0.8, 0.8, 1.0 };
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GLfloat black[] = { 0.0, 0.0, 0.0, 1.0 };
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glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glPushMatrix ();
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glTranslatef (0.0, 0.0, tdist);
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glRotatef ((GLfloat) spinx, 1.0, 0.0, 0.0);
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glRotatef ((GLfloat) spiny, 0.0, 1.0, 0.0);
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glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, gray);
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glMaterialfv(GL_FRONT, GL_SPECULAR, black);
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glMaterialf(GL_FRONT, GL_SHININESS, 0.0);
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if (fill) {
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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glEnable(GL_POLYGON_OFFSET_FILL);
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glPolygonOffset(polyfactor, polyunits);
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glCallList (list);
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glDisable(GL_POLYGON_OFFSET_FILL);
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}
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glDisable(GL_LIGHTING);
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glDisable(GL_LIGHT0);
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glColor3f (1.0, 1.0, 1.0);
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glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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glPolygonOffset(-polyfactor, -polyunits);
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if (!fill) glEnable(GL_POLYGON_OFFSET_LINE);
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glCallList (list);
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glDisable(GL_POLYGON_OFFSET_LINE);
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glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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if (!fill) {
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glEnable(GL_LIGHTING);
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glEnable(GL_LIGHT0);
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glCallList (list);
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}
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glPopMatrix ();
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glFlush ();
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if (doubleBuffer) glutSwapBuffers();
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}
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/* specify initial properties
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* create display list with sphere
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* initialize lighting and depth buffer
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*/
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void gfxinit (void)
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{
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GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
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GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
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GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
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GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
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GLfloat global_ambient[] = { 0.2, 0.2, 0.2, 1.0 };
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glClearColor (0.0, 0.0, 0.0, 1.0);
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list = glGenLists(1);
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glNewList (list, GL_COMPILE);
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glutSolidSphere(1.0, 20, 12);
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glEndList ();
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glEnable(GL_DEPTH_TEST);
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glLightfv (GL_LIGHT0, GL_AMBIENT, light_ambient);
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glLightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse);
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glLightfv (GL_LIGHT0, GL_SPECULAR, light_specular);
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glLightfv (GL_LIGHT0, GL_POSITION, light_position);
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glLightModelfv (GL_LIGHT_MODEL_AMBIENT, global_ambient);
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}
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/* call when window is resized */
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void reshape(int width, int height)
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{
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glViewport (0, 0, width, height);
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glMatrixMode (GL_PROJECTION);
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glLoadIdentity ();
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gluPerspective(45.0, (GLdouble)width/(GLdouble)height,
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1.0, 10.0);
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glMatrixMode (GL_MODELVIEW);
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glLoadIdentity ();
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gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
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}
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static void Benchmark( float xdiff, float ydiff )
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{
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int startTime, endTime;
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int draws;
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double seconds, fps;
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printf("Benchmarking...\n");
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draws = 0;
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startTime = glutGet(GLUT_ELAPSED_TIME);
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spinx = spiny = 0.0;
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do {
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spinx += xdiff;
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spiny += ydiff;
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display();
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draws++;
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endTime = glutGet(GLUT_ELAPSED_TIME);
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} while (endTime - startTime < 5000); /* 5 seconds */
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/* Results */
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seconds = (double) (endTime - startTime) / 1000.0;
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fps = draws / seconds;
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printf("Result: fps: %g\n", fps);
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}
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/* call when mouse button is pressed */
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/* ARGSUSED2 */
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void mouse(int button, int state, int x, int y) {
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switch (button) {
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case GLUT_LEFT_BUTTON:
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switch (state) {
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case GLUT_DOWN:
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spinx += 5;
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glutPostRedisplay();
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break;
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default:
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break;
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}
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break;
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case GLUT_MIDDLE_BUTTON:
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switch (state) {
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case GLUT_DOWN:
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spiny += 5;
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glutPostRedisplay();
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break;
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default:
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break;
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}
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break;
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case GLUT_RIGHT_BUTTON:
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switch (state) {
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case GLUT_UP:
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exit(0);
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break;
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default:
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break;
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}
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break;
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default:
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break;
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}
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}
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/* ARGSUSED1 */
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void keyboard (unsigned char key, int x, int y)
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{
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switch (key) {
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case 't':
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if (tdist < 4.0) {
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tdist = (tdist + 0.5);
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glutPostRedisplay();
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}
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break;
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case 'T':
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if (tdist > -5.0) {
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tdist = (tdist - 0.5);
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glutPostRedisplay();
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}
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break;
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case 'F':
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polyfactor = polyfactor + 0.1;
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printf ("polyfactor is %f\n", polyfactor);
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glutPostRedisplay();
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break;
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case 'f':
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polyfactor = polyfactor - 0.1;
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printf ("polyfactor is %f\n", polyfactor);
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glutPostRedisplay();
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break;
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case 'U':
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polyunits = polyunits + 1.0;
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printf ("polyunits is %f\n", polyunits);
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glutPostRedisplay();
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break;
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case 'u':
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polyunits = polyunits - 1.0;
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printf ("polyunits is %f\n", polyunits);
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glutPostRedisplay();
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break;
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case 'b':
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Benchmark(5.0, 0);
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break;
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case 'B':
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Benchmark(0, 5.0);
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break;
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case ' ':
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fill = !fill;
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printf ("fill/line: %d\n", fill);
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glutPostRedisplay();
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break;
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case 27: /* Escape */
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exit(0);
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break;
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default:
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break;
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}
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}
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static void
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key(unsigned char k, int x, int y)
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{
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switch (k) {
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case 27: /* Escape */
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exit(0);
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break;
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default:
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return;
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}
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glutPostRedisplay();
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}
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GLenum Args(int argc, char **argv)
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{
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GLint i;
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doubleBuffer = GL_FALSE;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-sb") == 0) {
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doubleBuffer = GL_FALSE;
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} else if (strcmp(argv[i], "-db") == 0) {
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doubleBuffer = GL_TRUE;
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} else {
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printf("%s (Bad option).\n", argv[i]);
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return GL_FALSE;
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}
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}
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return GL_TRUE;
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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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GLuint type;
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glutInit(&argc, argv);
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Args(argc, argv);
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type = GLUT_DEPTH | GLUT_RGB;
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type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
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glutInitDisplayMode(type);
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glutCreateWindow("polyoff");
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glutReshapeFunc(reshape);
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glutDisplayFunc(display);
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glutMouseFunc(mouse);
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glutKeyboardFunc(keyboard);
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gfxinit();
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glutMainLoop();
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return 0;
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}
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#else
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int main(int argc, char** argv)
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{
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fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n");
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fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n");
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fprintf (stderr, "you may be able to modify this program to make it run.\n");
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return 0;
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}
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#endif
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