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- /*
- * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
- *
- * Permission to use, copy, modify, distribute, and sell this software and
- * its documentation for any purpose is hereby granted without fee, provided
- * that (i) the above copyright notices and this permission notice appear in
- * all copies of the software and related documentation, and (ii) the name of
- * Silicon Graphics may not be used in any advertising or
- * publicity relating to the software without the specific, prior written
- * permission of Silicon Graphics.
- *
- * THE SOFTWARE IS PROVIDED "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 BE LIABLE FOR
- * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
- * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
- * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
- * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
- * OF THIS SOFTWARE.
- */
-
- /*
- * Nov 20, 1995 use stdlib's rand()/srand() instead of random()/srand48(), etc.
- */
-
-
- #define _HPUX_SOURCE
-
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <math.h>
- #include <sys/types.h>
- #include <sys/time.h>
- #include "gltk.h"
-
- #ifndef RAND_MAX
- # define RAND_MAX 32767
- #endif
-
-
- #define XSIZE 100
- #define YSIZE 75
-
- #define RINGS 5
- #define BLUERING 0
- #define BLACKRING 1
- #define REDRING 2
- #define YELLOWRING 3
- #define GREENRING 4
-
- #define BACKGROUND 8
-
- enum {
- BLACK = 0,
- RED,
- GREEN,
- YELLOW,
- BLUE,
- MAGENTA,
- CYAN,
- WHITE
- };
-
-
- GLenum rgb, doubleBuffer, directRender;
-
- unsigned char rgb_colors[RINGS][3];
- int mapped_colors[RINGS];
- float dests[RINGS][3];
- float offsets[RINGS][3];
- float angs[RINGS];
- float rotAxis[RINGS][3];
- int iters[RINGS];
- GLuint theTorus;
-
-
- void FillTorus(float rc, int numc, float rt, int numt)
- {
- int i, j, k;
- double s, t;
- double x, y, z;
- double pi, twopi;
-
- pi = 3.14159265358979323846;
- twopi = 2 * pi;
-
- for (i = 0; i < numc; i++) {
- glBegin(GL_QUAD_STRIP);
- for (j = 0; j <= numt; j++) {
- for (k = 1; k >= 0; k--) {
- s = (i + k) % numc + 0.5;
- t = j % numt;
-
- x = cos(t*twopi/numt) * cos(s*twopi/numc);
- y = sin(t*twopi/numt) * cos(s*twopi/numc);
- z = sin(s*twopi/numc);
- glNormal3f(x, y, z);
-
- x = (rt + rc * cos(s*twopi/numc)) * cos(t*twopi/numt);
- y = (rt + rc * cos(s*twopi/numc)) * sin(t*twopi/numt);
- z = rc * sin(s*twopi/numc);
- glVertex3f(x, y, z);
- }
- }
- glEnd();
- }
- }
-
- float Clamp(int iters_left, float t)
- {
-
- if (iters_left < 3) {
- return 0.0;
- }
- return (iters_left-2)*t/iters_left;
- }
-
- void DrawScene(void)
- {
- int i, j;
- GLboolean goIdle;
-
- goIdle = GL_TRUE;
- for (i = 0; i < RINGS; i++) {
- if (iters[i]) {
- for (j = 0; j < 3; j++) {
- offsets[i][j] = Clamp(iters[i], offsets[i][j]);
- }
- angs[i] = Clamp(iters[i], angs[i]);
- iters[i]--;
- goIdle = GL_FALSE;
- }
- }
- if (goIdle) {
- tkIdleFunc(NULL);
- }
-
- glPushMatrix();
-
- glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
- gluLookAt(0,0,10, 0,0,0, 0,1,0);
-
- for (i = 0; i < RINGS; i++) {
- if (rgb) {
- glColor3ubv(rgb_colors[i]);
- } else {
- glIndexi(mapped_colors[i]);
- }
- glPushMatrix();
- glTranslatef(dests[i][0]+offsets[i][0], dests[i][1]+offsets[i][1],
- dests[i][2]+offsets[i][2]);
- glRotatef(angs[i], rotAxis[i][0], rotAxis[i][1], rotAxis[i][2]);
- glCallList(theTorus);
- glPopMatrix();
- }
-
- glPopMatrix();
-
- glFlush();
- if (doubleBuffer) {
- tkSwapBuffers();
- }
- }
-
- float MyRand(void)
- {
- return 10.0 * ( (float) rand() / (float) RAND_MAX - 0.5 );
- }
-
- void ReInit(void)
- {
- int i;
- float deviation;
-
- deviation = MyRand() / 2;
- deviation = deviation * deviation;
- for (i = 0; i < RINGS; i++) {
- offsets[i][0] = MyRand();
- offsets[i][1] = MyRand();
- offsets[i][2] = MyRand();
- angs[i] = 260.0 * MyRand();
- rotAxis[i][0] = MyRand();
- rotAxis[i][1] = MyRand();
- rotAxis[i][2] = MyRand();
- iters[i] = (deviation * MyRand() + 60.0);
- }
- tkIdleFunc(DrawScene);
- }
-
- void Init(void)
- {
- float base, height;
- float aspect, x, y;
- int i;
- struct timeval t;
-
- float top_y = 1.0;
- float bottom_y = 0.0;
- float top_z = 0.15;
- float bottom_z = 0.69;
- float spacing = 2.5;
- static float lmodel_ambient[] = {0.0, 0.0, 0.0, 0.0};
- static float lmodel_twoside[] = {GL_FALSE};
- static float lmodel_local[] = {GL_FALSE};
- static float light0_ambient[] = {0.1, 0.1, 0.1, 1.0};
- static float light0_diffuse[] = {1.0, 1.0, 1.0, 0.0};
- static float light0_position[] = {0.8660254, 0.5, 1, 0};
- static float light0_specular[] = {1.0, 1.0, 1.0, 0.0};
- static float bevel_mat_ambient[] = {0.0, 0.0, 0.0, 1.0};
- static float bevel_mat_shininess[] = {40.0};
- static float bevel_mat_specular[] = {1.0, 1.0, 1.0, 0.0};
- static float bevel_mat_diffuse[] = {1.0, 0.0, 0.0, 0.0};
-
- gettimeofday(&t, NULL);
- srand( t.tv_usec );
-
- ReInit();
- for (i = 0; i < RINGS; i++) {
- rgb_colors[i][0] = rgb_colors[i][1] = rgb_colors[i][2] = 0;
- }
- rgb_colors[BLUERING][2] = 255;
- rgb_colors[REDRING][0] = 255;
- rgb_colors[GREENRING][1] = 255;
- rgb_colors[YELLOWRING][0] = 255;
- rgb_colors[YELLOWRING][1] = 255;
- mapped_colors[BLUERING] = BLUE;
- mapped_colors[REDRING] = RED;
- mapped_colors[GREENRING] = GREEN;
- mapped_colors[YELLOWRING] = YELLOW;
- mapped_colors[BLACKRING] = BLACK;
-
- dests[BLUERING][0] = -spacing;
- dests[BLUERING][1] = top_y;
- dests[BLUERING][2] = top_z;
-
- dests[BLACKRING][0] = 0.0;
- dests[BLACKRING][1] = top_y;
- dests[BLACKRING][2] = top_z;
-
- dests[REDRING][0] = spacing;
- dests[REDRING][1] = top_y;
- dests[REDRING][2] = top_z;
-
- dests[YELLOWRING][0] = -spacing / 2.0;
- dests[YELLOWRING][1] = bottom_y;
- dests[YELLOWRING][2] = bottom_z;
-
- dests[GREENRING][0] = spacing / 2.0;
- dests[GREENRING][1] = bottom_y;
- dests[GREENRING][2] = bottom_z;
-
- base = 2.0;
- height = 2.0;
- theTorus = glGenLists(1);
- glNewList(theTorus, GL_COMPILE);
- FillTorus(0.1, 8, 1.0, 25);
- glEndList();
-
- x = (float)XSIZE;
- y = (float)YSIZE;
- aspect = x / y;
- glEnable(GL_CULL_FACE);
- glCullFace(GL_BACK);
- glEnable(GL_DEPTH_TEST);
- glClearDepth(1.0);
-
- if (rgb) {
- glClearColor(0.5, 0.5, 0.5, 0.0);
- glLightfv(GL_LIGHT0, GL_AMBIENT, light0_ambient);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, light0_diffuse);
- glLightfv(GL_LIGHT0, GL_SPECULAR, light0_specular);
- glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
- glEnable(GL_LIGHT0);
-
- glLightModelfv(GL_LIGHT_MODEL_LOCAL_VIEWER, lmodel_local);
- glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
- glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
- glEnable(GL_LIGHTING);
-
- glMaterialfv(GL_FRONT, GL_AMBIENT, bevel_mat_ambient);
- glMaterialfv(GL_FRONT, GL_SHININESS, bevel_mat_shininess);
- glMaterialfv(GL_FRONT, GL_SPECULAR, bevel_mat_specular);
- glMaterialfv(GL_FRONT, GL_DIFFUSE, bevel_mat_diffuse);
-
- glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);
- glEnable(GL_COLOR_MATERIAL);
- glShadeModel(GL_SMOOTH);
- } else {
- glClearIndex(BACKGROUND);
- glShadeModel(GL_FLAT);
- }
-
- glMatrixMode(GL_PROJECTION);
- gluPerspective(45, 1.33, 0.1, 100.0);
- glMatrixMode(GL_MODELVIEW);
- }
-
- void Reshape(int width, int height)
- {
-
- glViewport(0, 0, width, height);
- }
-
- GLenum Key(int key, GLenum mask)
- {
-
- switch (key) {
- case TK_ESCAPE:
- tkQuit();
- case TK_SPACE:
- ReInit();
- break;
- default:
- return GL_FALSE;
- }
- return GL_TRUE;
- }
-
- GLenum Args(int argc, char **argv)
- {
- GLint i;
-
- rgb = GL_TRUE;
- doubleBuffer = GL_FALSE;
- directRender = GL_TRUE;
-
- for (i = 1; i < argc; i++) {
- if (strcmp(argv[i], "-ci") == 0) {
- rgb = GL_FALSE;
- } else if (strcmp(argv[i], "-rgb") == 0) {
- rgb = GL_TRUE;
- } else if (strcmp(argv[i], "-sb") == 0) {
- doubleBuffer = GL_FALSE;
- } else if (strcmp(argv[i], "-db") == 0) {
- doubleBuffer = GL_TRUE;
- } else if (strcmp(argv[i], "-dr") == 0) {
- directRender = GL_TRUE;
- } else if (strcmp(argv[i], "-ir") == 0) {
- directRender = GL_FALSE;
- } else {
- printf("%s (Bad option).\n", argv[i]);
- return GL_FALSE;
- }
- }
- return GL_TRUE;
- }
-
- void main(int argc, char **argv)
- {
- GLenum type;
-
- if (Args(argc, argv) == GL_FALSE) {
- tkQuit();
- }
-
- tkInitPosition(0, 0, 400, 300);
-
- type = TK_DEPTH;
- type |= (rgb) ? TK_RGB : TK_INDEX;
- type |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
- type |= (directRender) ? TK_DIRECT : TK_INDIRECT;
- tkInitDisplayMode(type);
-
- if (tkInitWindow("Olympic") == GL_FALSE) {
- tkQuit();
- }
-
- Init();
-
- tkExposeFunc(Reshape);
- tkReshapeFunc(Reshape);
- tkKeyDownFunc(Key);
- tkIdleFunc(DrawScene);
-
- tkExec();
- }
-