403 lines
9.6 KiB
C
403 lines
9.6 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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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include <sys/types.h>
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#ifdef __unix
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#include <sys/time.h>
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#else
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#include <stdlib.h>
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#include <time.h>
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#endif
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#include "tk.h"
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#ifdef __unix
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extern double drand48(void);
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extern void srand48(long seedval);
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#endif
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#define XSIZE 100
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#define YSIZE 75
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#define RINGS 5
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#define BLUERING 0
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#define BLACKRING 1
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#define REDRING 2
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#define YELLOWRING 3
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#define GREENRING 4
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#define BACKGROUND 8
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enum {
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BLACK = 0,
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RED,
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GREEN,
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YELLOW,
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BLUE,
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MAGENTA,
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CYAN,
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WHITE
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};
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typedef short Point[2];
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GLenum rgb, doubleBuffer, directRender;
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unsigned char rgb_colors[RINGS][3];
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int mapped_colors[RINGS];
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float dests[RINGS][3];
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float offsets[RINGS][3];
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float angs[RINGS];
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float rotAxis[RINGS][3];
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int iters[RINGS];
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GLuint theTorus;
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void FillTorus(float rc, int numc, float rt, int numt)
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{
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int i, j, k;
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double s, t;
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double x, y, z;
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double pi, twopi;
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pi = 3.14159265358979323846;
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twopi = 2 * pi;
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for (i = 0; i < numc; i++) {
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glBegin(GL_QUAD_STRIP);
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for (j = 0; j <= numt; j++) {
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for (k = 1; k >= 0; k--) {
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s = (i + k) % numc + 0.5;
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t = j % numt;
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x = cos(t*twopi/numt) * cos(s*twopi/numc);
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y = sin(t*twopi/numt) * cos(s*twopi/numc);
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z = sin(s*twopi/numc);
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glNormal3f(x, y, z);
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x = (rt + rc * cos(s*twopi/numc)) * cos(t*twopi/numt);
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y = (rt + rc * cos(s*twopi/numc)) * sin(t*twopi/numt);
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z = rc * sin(s*twopi/numc);
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glVertex3f(x, y, z);
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}
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}
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glEnd();
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}
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}
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float Clamp(int iters_left, float t)
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{
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if (iters_left < 3) {
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return 0.0;
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}
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return (iters_left-2)*t/iters_left;
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}
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void DrawScene(void)
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{
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int i, j;
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for (i = 0; i < RINGS; i++) {
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if (iters[i]) {
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for (j = 0; j < 3; j++) {
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offsets[i][j] = Clamp(iters[i], offsets[i][j]);
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}
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angs[i] = Clamp(iters[i], angs[i]);
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iters[i]--;
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}
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}
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glPushMatrix();
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glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
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gluLookAt(0,0,10, 0,0,0, 0,1,0);
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for (i = 0; i < RINGS; i++) {
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if (rgb) {
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glColor3ubv(rgb_colors[i]);
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} else {
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glIndexi(mapped_colors[i]);
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}
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glPushMatrix();
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glTranslatef(dests[i][0]+offsets[i][0], dests[i][1]+offsets[i][1],
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dests[i][2]+offsets[i][2]);
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glRotatef(angs[i], rotAxis[i][0], rotAxis[i][1], rotAxis[i][2]);
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glCallList(theTorus);
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glPopMatrix();
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}
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glPopMatrix();
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glFlush();
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if (doubleBuffer) {
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tkSwapBuffers();
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}
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}
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float MyRand(void)
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{
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#ifdef __unix
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return 10.0 * (drand48() - 0.5);
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#else
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return 10.0 * ( ((float) rand())/((float) RAND_MAX) - 0.5);
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#endif
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}
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void ReInit(void)
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{
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int i;
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float deviation;
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deviation = MyRand() / 2;
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deviation = deviation * deviation;
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for (i = 0; i < RINGS; i++) {
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offsets[i][0] = MyRand();
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offsets[i][1] = MyRand();
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offsets[i][2] = MyRand();
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angs[i] = 260.0 * MyRand();
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rotAxis[i][0] = MyRand();
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rotAxis[i][1] = MyRand();
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rotAxis[i][2] = MyRand();
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iters[i] = (deviation * MyRand() + 60.0);
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}
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}
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void Init(void)
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{
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int gid;
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float base, height;
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float aspect, x, y;
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int i;
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#ifdef __unix
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struct timeval t;
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struct timezone tz;
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#else
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time_t timer, timerr;
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#endif
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float sc = 10;
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float top_y = 1.0;
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float bottom_y = 0.0;
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float top_z = 0.15;
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float bottom_z = 0.69;
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float spacing = 2.5;
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static float lmodel_ambient[] = {0.0, 0.0, 0.0, 0.0};
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static float lmodel_twoside[] = {GL_FALSE};
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static float lmodel_local[] = {GL_FALSE};
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static float light0_ambient[] = {0.1, 0.1, 0.1, 1.0};
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static float light0_diffuse[] = {1.0, 1.0, 1.0, 0.0};
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static float light0_position[] = {0.8660254, 0.5, 1, 0};
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static float light0_specular[] = {1.0, 1.0, 1.0, 0.0};
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static float bevel_mat_ambient[] = {0.0, 0.0, 0.0, 1.0};
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static float bevel_mat_shininess[] = {40.0};
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static float bevel_mat_specular[] = {1.0, 1.0, 1.0, 0.0};
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static float bevel_mat_diffuse[] = {1.0, 0.0, 0.0, 0.0};
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#ifdef __unix
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gettimeofday(&t, &tz);
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srand48(t.tv_usec);
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#else
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time( &timer );
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srand( timer );
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#endif
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ReInit();
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for (i = 0; i < RINGS; i++) {
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rgb_colors[i][0] = rgb_colors[i][1] = rgb_colors[i][2] = 0;
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}
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rgb_colors[BLUERING][2] = 255;
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rgb_colors[REDRING][0] = 255;
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rgb_colors[GREENRING][1] = 255;
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rgb_colors[YELLOWRING][0] = 255;
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rgb_colors[YELLOWRING][1] = 255;
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mapped_colors[BLUERING] = BLUE;
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mapped_colors[REDRING] = RED;
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mapped_colors[GREENRING] = GREEN;
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mapped_colors[YELLOWRING] = YELLOW;
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mapped_colors[BLACKRING] = BLACK;
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dests[BLUERING][0] = -spacing;
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dests[BLUERING][1] = top_y;
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dests[BLUERING][2] = top_z;
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dests[BLACKRING][0] = 0.0;
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dests[BLACKRING][1] = top_y;
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dests[BLACKRING][2] = top_z;
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dests[REDRING][0] = spacing;
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dests[REDRING][1] = top_y;
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dests[REDRING][2] = top_z;
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dests[YELLOWRING][0] = -spacing / 2.0;
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dests[YELLOWRING][1] = bottom_y;
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dests[YELLOWRING][2] = bottom_z;
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dests[GREENRING][0] = spacing / 2.0;
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dests[GREENRING][1] = bottom_y;
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dests[GREENRING][2] = bottom_z;
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base = 2.0;
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height = 2.0;
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theTorus = glGenLists(1);
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glNewList(theTorus, GL_COMPILE);
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FillTorus(0.1, 8, 1.0, 25);
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glEndList();
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x = (float)XSIZE;
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y = (float)YSIZE;
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aspect = x / y;
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glEnable(GL_CULL_FACE);
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glCullFace(GL_BACK);
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glEnable(GL_DEPTH_TEST);
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glClearDepth(1.0);
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if (rgb) {
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glClearColor(0.5, 0.5, 0.5, 0.0);
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glLightfv(GL_LIGHT0, GL_AMBIENT, light0_ambient);
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glLightfv(GL_LIGHT0, GL_DIFFUSE, light0_diffuse);
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glLightfv(GL_LIGHT0, GL_SPECULAR, light0_specular);
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glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
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glEnable(GL_LIGHT0);
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glLightModelfv(GL_LIGHT_MODEL_LOCAL_VIEWER, lmodel_local);
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glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
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glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
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glEnable(GL_LIGHTING);
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glMaterialfv(GL_FRONT, GL_AMBIENT, bevel_mat_ambient);
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glMaterialfv(GL_FRONT, GL_SHININESS, bevel_mat_shininess);
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glMaterialfv(GL_FRONT, GL_SPECULAR, bevel_mat_specular);
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glMaterialfv(GL_FRONT, GL_DIFFUSE, bevel_mat_diffuse);
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glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);
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glEnable(GL_COLOR_MATERIAL);
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glShadeModel(GL_SMOOTH);
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} else {
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glClearIndex(BACKGROUND);
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glShadeModel(GL_FLAT);
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}
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glMatrixMode(GL_PROJECTION);
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gluPerspective(45, 1.33, 0.1, 100.0);
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glMatrixMode(GL_MODELVIEW);
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}
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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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}
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GLenum Key(int key, GLenum mask)
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{
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switch (key) {
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case TK_ESCAPE:
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tkQuit();
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case TK_SPACE:
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ReInit();
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break;
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default:
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return GL_FALSE;
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}
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return GL_TRUE;
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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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rgb = GL_TRUE;
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doubleBuffer = GL_TRUE;
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directRender = GL_FALSE;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-ci") == 0) {
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rgb = GL_FALSE;
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} else if (strcmp(argv[i], "-rgb") == 0) {
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rgb = GL_TRUE;
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} else 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 if (strcmp(argv[i], "-dr") == 0) {
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directRender = GL_TRUE;
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} else if (strcmp(argv[i], "-ir") == 0) {
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directRender = GL_FALSE;
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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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void main(int argc, char **argv)
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{
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GLenum type;
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if (Args(argc, argv) == GL_FALSE) {
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tkQuit();
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}
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tkInitPosition(10, 30, 400, 300);
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type = (rgb) ? TK_RGB : TK_INDEX;
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type |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
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type |= (directRender) ? TK_DIRECT : TK_INDIRECT;
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type |= TK_DEPTH16;
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tkInitDisplayMode(type);
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if (tkInitWindow("Olympic") == GL_FALSE) {
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tkQuit();
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}
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Init();
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tkExposeFunc(Reshape);
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tkReshapeFunc(Reshape);
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tkKeyDownFunc(Key);
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tkIdleFunc(DrawScene);
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tkExec();
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}
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