345 lines
7.7 KiB
C
345 lines
7.7 KiB
C
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/*
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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 "windows.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <time.h>
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#include "GL/gl.h"
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#include "GL/glu.h"
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#include "tk.h"
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#define PI 3.141592657
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enum {
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NORMAL = 0,
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WEIRD = 1
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};
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enum {
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STREAK = 0,
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CIRCLE = 1
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};
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#define MAXSTARS 400
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#define MAXPOS 10000
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#define MAXWARP 10
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#define MAXANGLES 6000
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typedef struct _starRec {
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GLint type;
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float x[2], y[2], z[2];
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float offsetX, offsetY, offsetR, rotation;
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} starRec;
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GLenum doubleBuffer, directRender;
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GLint windW, windH;
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GLenum flag = NORMAL;
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GLint starCount = MAXSTARS / 2;
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float speed = 1.0;
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GLint nitro = 0;
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starRec stars[MAXSTARS];
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float sinTable[MAXANGLES];
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float Sin(float angle)
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{
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return (sinTable[(GLint)angle]);
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}
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float Cos(float angle)
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{
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return (sinTable[((GLint)angle+(MAXANGLES/4))%MAXANGLES]);
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}
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void NewStar(GLint n, GLint d)
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{
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if (rand()%4 == 0) {
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stars[n].type = CIRCLE;
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} else {
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stars[n].type = STREAK;
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}
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stars[n].x[0] = (float)(rand() % MAXPOS - MAXPOS / 2);
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stars[n].y[0] = (float)(rand() % MAXPOS - MAXPOS / 2);
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stars[n].z[0] = (float)(rand() % MAXPOS + d);
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if (rand()%4 == 0 && flag == WEIRD) {
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stars[n].offsetX = (float)(rand() % 100 - 100 / 2);
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stars[n].offsetY = (float)(rand() % 100 - 100 / 2);
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stars[n].offsetR = (float)(rand() % 25 - 25 / 2);
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} else {
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stars[n].offsetX = 0.0;
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stars[n].offsetY = 0.0;
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stars[n].offsetR = 0.0;
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}
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}
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void RotatePoint(float *x, float *y, float rotation)
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{
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float tmpX, tmpY;
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tmpX = *x * Cos(rotation) - *y * Sin(rotation);
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tmpY = *y * Cos(rotation) + *x * Sin(rotation);
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*x = tmpX;
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*y = tmpY;
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}
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void MoveStars(void)
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{
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float offset;
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GLint n;
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offset = speed * 60.0;
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for (n = 0; n < starCount; n++) {
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stars[n].x[1] = stars[n].x[0];
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stars[n].y[1] = stars[n].y[0];
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stars[n].z[1] = stars[n].z[0];
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stars[n].x[0] += stars[n].offsetX;
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stars[n].y[0] += stars[n].offsetY;
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stars[n].z[0] -= offset;
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stars[n].rotation += stars[n].offsetR;
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if (stars[n].rotation > MAXANGLES) {
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stars[n].rotation = 0.0;
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}
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}
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}
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GLenum StarPoint(GLint n)
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{
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float x0, y0, x1, y1, width;
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GLint i;
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x0 = stars[n].x[0] * windW / stars[n].z[0];
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y0 = stars[n].y[0] * windH / stars[n].z[0];
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RotatePoint(&x0, &y0, stars[n].rotation);
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x0 += windW / 2.0;
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y0 += windH / 2.0;
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if (x0 >= 0.0 && x0 < windW && y0 >= 0.0 && y0 < windH) {
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if (stars[n].type == STREAK) {
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x1 = stars[n].x[1] * windW / stars[n].z[1];
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y1 = stars[n].y[1] * windH / stars[n].z[1];
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RotatePoint(&x1, &y1, stars[n].rotation);
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x1 += windW / 2.0;
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y1 += windH / 2.0;
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glLineWidth(MAXPOS/100.0/stars[n].z[0]+1.0);
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glColor3f(1.0, (MAXWARP-speed)/MAXWARP, (MAXWARP-speed)/MAXWARP);
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if (fabs(x0-x1) < 1.0 && fabs(y0-y1) < 1.0) {
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glBegin(GL_POINTS);
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glVertex2f(x0, y0);
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glEnd();
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} else {
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glBegin(GL_LINES);
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glVertex2f(x0, y0);
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glVertex2f(x1, y1);
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glEnd();
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}
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} else {
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width = MAXPOS / 10.0 / stars[n].z[0] + 1.0;
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glColor3f(1.0, 0.0, 0.0);
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glBegin(GL_POLYGON);
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for (i = 0; i < 8; i++) {
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float x = x0 + width * Cos((float)i*MAXANGLES/8.0);
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float y = y0 + width * Sin((float)i*MAXANGLES/8.0);
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glVertex2f(x, y);
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};
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glEnd();
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}
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return GL_TRUE;
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} else {
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return GL_FALSE;
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}
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}
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void ShowStars(void)
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{
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GLint n;
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glClear(GL_COLOR_BUFFER_BIT);
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for (n = 0; n < starCount; n++) {
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if (stars[n].z[0] > speed || (stars[n].z[0] > 0.0 && speed < MAXWARP)) {
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if (StarPoint(n) == GL_FALSE) {
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NewStar(n, MAXPOS);
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}
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} else {
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NewStar(n, MAXPOS);
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}
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}
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}
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static void Init(void)
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{
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float angle;
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GLint n;
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srand((unsigned int)time(NULL));
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for (n = 0; n < MAXSTARS; n++) {
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NewStar(n, 100);
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}
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angle = 0.0;
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for (n = 0; n < MAXANGLES ; n++) {
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sinTable[n] = sin(angle);
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angle += PI / (MAXANGLES / 2.0);
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}
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glClearColor(0.0, 0.0, 0.0, 0.0);
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glDisable(GL_DITHER);
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}
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void Reshape(int width, int height)
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{
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windW = (GLint)width;
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windH = (GLint)height;
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glViewport(0, 0, windW, windH);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluOrtho2D(-0.5, windW+0.5, -0.5, windH+0.5);
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glMatrixMode(GL_MODELVIEW);
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}
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static 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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flag = (flag == NORMAL) ? WEIRD : NORMAL;
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break;
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case TK_t:
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nitro = 1;
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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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void Idle(void)
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{
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MoveStars();
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ShowStars();
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if (nitro > 0) {
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speed = (float)(nitro / 10) + 1.0;
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if (speed > MAXWARP) {
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speed = MAXWARP;
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}
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if (++nitro > MAXWARP*10) {
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nitro = -nitro;
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}
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} else if (nitro < 0) {
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nitro++;
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speed = (float)(-nitro / 10) + 1.0;
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if (speed > MAXWARP) {
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speed = MAXWARP;
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}
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}
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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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static 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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directRender = 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 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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}
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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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windW = 300;
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windH = 300;
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tkInitPosition(0, 0, 300, 300);
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type = TK_RGB;
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type |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
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type |= (directRender) ? TK_DIRECT : TK_INDIRECT;
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tkInitDisplayMode(type);
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if (tkInitWindow("Stars") == 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(Idle);
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tkExec();
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}
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