+++ /dev/null
-/*
- * 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.
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <math.h>
-#include <time.h>
-#include <GL/glut.h>
-
-
-#ifndef PI
-#define PI 3.141592657
-#endif
-
-
-enum {
- NORMAL = 0,
- WEIRD = 1
-};
-
-enum {
- STREAK = 0,
- CIRCLE = 1
-};
-
-#define MAXSTARS 400
-#define MAXPOS 10000
-#define MAXWARP 10
-#define MAXANGLES 6000
-
-
-typedef struct _starRec {
- GLint type;
- float x[2], y[2], z[2];
- float offsetX, offsetY, offsetR, rotation;
-} starRec;
-
-
-GLenum doubleBuffer;
-GLint windW, windH;
-
-GLenum flag = NORMAL, overlayInit = GL_FALSE;
-GLint starCount = MAXSTARS / 2;
-float speed = 1.0;
-GLint nitro = 0;
-starRec stars[MAXSTARS];
-float sinTable[MAXANGLES];
-
-
-static float Sin(float angle)
-{
-
- return (sinTable[(GLint)angle]);
-}
-
-static float Cos(float angle)
-{
-
- return (sinTable[((GLint)angle+(MAXANGLES/4))%MAXANGLES]);
-}
-
-static void NewStar(GLint n, GLint d)
-{
-
- if (rand()%4 == 0) {
- stars[n].type = CIRCLE;
- } else {
- stars[n].type = STREAK;
- }
- stars[n].x[0] = (float)(rand() % MAXPOS - MAXPOS / 2);
- stars[n].y[0] = (float)(rand() % MAXPOS - MAXPOS / 2);
- stars[n].z[0] = (float)(rand() % MAXPOS + d);
- if (rand()%4 == 0 && flag == WEIRD) {
- stars[n].offsetX = (float)(rand() % 100 - 100 / 2);
- stars[n].offsetY = (float)(rand() % 100 - 100 / 2);
- stars[n].offsetR = (float)(rand() % 25 - 25 / 2);
- } else {
- stars[n].offsetX = 0.0;
- stars[n].offsetY = 0.0;
- stars[n].offsetR = 0.0;
- }
-}
-
-static void RotatePoint(float *x, float *y, float rotation)
-{
- float tmpX, tmpY;
-
- tmpX = *x * Cos(rotation) - *y * Sin(rotation);
- tmpY = *y * Cos(rotation) + *x * Sin(rotation);
- *x = tmpX;
- *y = tmpY;
-}
-
-static void MoveStars(void)
-{
- float offset;
- GLint n;
-
- offset = speed * 60.0;
-
- for (n = 0; n < starCount; n++) {
- stars[n].x[1] = stars[n].x[0];
- stars[n].y[1] = stars[n].y[0];
- stars[n].z[1] = stars[n].z[0];
- stars[n].x[0] += stars[n].offsetX;
- stars[n].y[0] += stars[n].offsetY;
- stars[n].z[0] -= offset;
- stars[n].rotation += stars[n].offsetR;
- if (stars[n].rotation > MAXANGLES) {
- stars[n].rotation = 0.0;
- }
- }
-}
-
-static GLenum StarPoint(GLint n)
-{
- float x0, y0, x1, y1, width;
- GLint i;
-
- x0 = stars[n].x[0] * windW / stars[n].z[0];
- y0 = stars[n].y[0] * windH / stars[n].z[0];
- RotatePoint(&x0, &y0, stars[n].rotation);
- x0 += windW / 2.0;
- y0 += windH / 2.0;
-
- if (x0 >= 0.0 && x0 < windW && y0 >= 0.0 && y0 < windH) {
- if (stars[n].type == STREAK) {
- x1 = stars[n].x[1] * windW / stars[n].z[1];
- y1 = stars[n].y[1] * windH / stars[n].z[1];
- RotatePoint(&x1, &y1, stars[n].rotation);
- x1 += windW / 2.0;
- y1 += windH / 2.0;
-
- glLineWidth(MAXPOS/100.0/stars[n].z[0]+1.0);
- glColor3f(1.0, (MAXWARP-speed)/MAXWARP, (MAXWARP-speed)/MAXWARP);
- if (fabs(x0-x1) < 1.0 && fabs(y0-y1) < 1.0) {
- glBegin(GL_POINTS);
- glVertex2f(x0, y0);
- glEnd();
- } else {
- glBegin(GL_LINES);
- glVertex2f(x0, y0);
- glVertex2f(x1, y1);
- glEnd();
- }
- } else {
- width = MAXPOS / 10.0 / stars[n].z[0] + 1.0;
- glColor3f(1.0, 0.0, 0.0);
- glBegin(GL_POLYGON);
- for (i = 0; i < 8; i++) {
- float x = x0 + width * Cos((float)i*MAXANGLES/8.0);
- float y = y0 + width * Sin((float)i*MAXANGLES/8.0);
- glVertex2f(x, y);
- };
- glEnd();
- }
- return GL_TRUE;
- } else {
- return GL_FALSE;
- }
-}
-
-static void ShowStars(void)
-{
- GLint n;
-
- glClear(GL_COLOR_BUFFER_BIT);
-
- for (n = 0; n < starCount; n++) {
- if (stars[n].z[0] > speed || (stars[n].z[0] > 0.0 && speed < MAXWARP)) {
- if (StarPoint(n) == GL_FALSE) {
- NewStar(n, MAXPOS);
- }
- } else {
- NewStar(n, MAXPOS);
- }
- }
-}
-
-static void Init(void)
-{
- float angle;
- GLint n;
-
- srand((unsigned int)time(NULL));
-
- for (n = 0; n < MAXSTARS; n++) {
- NewStar(n, 100);
- }
-
- angle = 0.0;
- for (n = 0; n < MAXANGLES ; n++) {
- sinTable[n] = sin(angle);
- angle += PI / (MAXANGLES / 2.0);
- }
-
- glClearColor(0.0, 0.0, 0.0, 0.0);
-
- glDisable(GL_DITHER);
-}
-
-static void Reshape(int width, int height)
-{
-
- windW = (GLint)width;
- windH = (GLint)height;
-
- glutUseLayer(GLUT_OVERLAY);
-
- glViewport(0, 0, windW, windH);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluOrtho2D(-0.5, windW+0.5, -0.5, windH+0.5);
- glMatrixMode(GL_MODELVIEW);
- overlayInit = GL_FALSE;
-
- glutUseLayer(GLUT_NORMAL);
-
- glViewport(0, 0, windW, windH);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluOrtho2D(-0.5, windW+0.5, -0.5, windH+0.5);
- glMatrixMode(GL_MODELVIEW);
-}
-
-static void Key(unsigned char key, int x, int y)
-{
-
- switch (key) {
- case 27:
- exit(1);
- case 32:
- flag = (flag == NORMAL) ? WEIRD : NORMAL;
- break;
- case 't':
- nitro = 1;
- break;
- default:
- return;
- }
-}
-
-static void Idle(void)
-{
-
- if (overlayInit == GL_FALSE) {
- glutUseLayer(GLUT_OVERLAY);
- glClear(GL_COLOR_BUFFER_BIT);
-/* glColor3f(1.0, 0.0, 0.0);*/
-
- glIndexf( 2.0 );
- glBegin(GL_POLYGON);
- glVertex2i(windW/4-10, windH/4-10);
- glVertex2i(windW/2-10, windH/4-10);
- glVertex2i(windW/2-10, windH/2-10);
- glVertex2i(windW/4-10, windH/2-10);
- glEnd();
-
- glIndexf( 0.0 );
- glBegin(GL_POLYGON);
- glVertex2i(windW/4, windH/4);
- glVertex2i(windW/2, windH/4);
- glVertex2i(windW/2, windH/2);
- glVertex2i(windW/4, windH/2);
- glEnd();
-
- glIndexf( 1.0 );
- glBegin(GL_POLYGON);
- glVertex2i(windW/4+10, windH/4+10);
- glVertex2i(windW/2+10, windH/4+10);
- glVertex2i(windW/2+10, windH/2+10);
- glVertex2i(windW/4+10, windH/2+10);
- glEnd();
-
- glutUseLayer(GLUT_NORMAL);
- overlayInit = GL_TRUE;
- }
-
- MoveStars();
- ShowStars();
- if (nitro > 0) {
- speed = (float)(nitro / 10) + 1.0;
- if (speed > MAXWARP) {
- speed = MAXWARP;
- }
- if (++nitro > MAXWARP*10) {
- nitro = -nitro;
- }
- } else if (nitro < 0) {
- nitro++;
- speed = (float)(-nitro / 10) + 1.0;
- if (speed > MAXWARP) {
- speed = MAXWARP;
- }
- }
-
- glFlush();
- if (doubleBuffer) {
- glutSwapBuffers();
- }
-}
-
-static GLenum Args(int argc, char **argv)
-{
- GLint i;
-
- doubleBuffer = GL_TRUE;
-
- for (i = 1; i < argc; i++) {
- if (strcmp(argv[i], "-sb") == 0) {
- doubleBuffer = GL_FALSE;
- } else if (strcmp(argv[i], "-db") == 0) {
- doubleBuffer = GL_TRUE;
- }
- }
- return GL_TRUE;
-}
-
-int main(int argc, char **argv)
-{
- GLenum type;
-
- glutInit(&argc, argv);
-
- if (!glutLayerGet(GLUT_OVERLAY_POSSIBLE))
- {
- fprintf(stderr, "Overlay not available\n");
- return(1);
- }
-
- if (Args(argc, argv) == GL_FALSE) {
- return(1);
- }
-
- windW = 300;
- windH = 300;
- glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300);
-
- type = GLUT_RGB;
- type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
- glutInitDisplayMode(type);
-
- if (glutCreateWindow("Overlay Test") == GL_FALSE) {
- return(1);
- }
-
- glutEstablishOverlay();
-
- Init();
-
- glutReshapeFunc(Reshape);
- glutKeyboardFunc(Key);
- glutIdleFunc(Idle);
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff