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OLYMPIC.C
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C/C++ Source or Header
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1997-09-30
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8KB
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364 lines
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <sys/types.h>
//#include <sys/time.h>
#include "tk.h"
#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;
static int seed = 42;
void mysrand(int i)
{
seed = i;
}
int myrand()
{
return seed = (seed*7621 + 1)&0xffff;
}
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)
{
float boo;
return 10.0 * ((float)myrand()/(float)0xffff - 0.5);
// boo = (float) (random());
// return 10.0 * boo;
}
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] = (int)(deviation * MyRand() + 60.0);
// iters[i] = (int)((int)deviation*random()+60);
}
tkIdleFunc(DrawScene);
}
void Init(void)
{
int gid;
float base, height;
float aspect, x, y;
int i;
float sc = 10;
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};
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);
glColorMask(1, 1, 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);
mysrand(35);
}
void Reshape(int width, int height)
{
glViewport(0, 0, width, height);
}
GLenum Key(int key, GLenum mask)
{
switch (key) {
case TK_B:
tkClipBoard();
break;
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();
}