progs/trivial/clear-repeat.c

   1 /*
   2  * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that (i) the above copyright notices and this permission notice appear in
   7  * all copies of the software and related documentation, and (ii) the name of
   8  * Silicon Graphics may not be used in any advertising or
   9  * publicity relating to the software without the specific, prior written
  10  * permission of Silicon Graphics.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
  13  * ANY KIND,
  14  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  15  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
  18  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  20  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  21  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <math.h>
  29 #include <GL/glut.h>
  30
  31
  32 #define CI_OFFSET_1 16
  33 #define CI_OFFSET_2 32
  34
  35
  36 static void Init(void)
  37 {
  38    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  39    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  40    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  41    fflush(stderr);
  42
  43     glClearColor(0.3, 0.1, 0.3, 0.0);
  44 }
  45
  46 static void Reshape(int width, int height)
  47 {
  48
  49     glViewport(0, 0, (GLint)width, (GLint)height);
  50
  51     glMatrixMode(GL_PROJECTION);
  52     glLoadIdentity();
  53     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  54     glMatrixMode(GL_MODELVIEW);
  55 }
  56
  57 static void Key(unsigned char key, int x, int y)
  58 {
  59    switch (key) {
  60    case 27:
  61       exit(0);
  62    default:
  63       glutPostRedisplay();
  64       return;
  65    }
  66 }
  67
  68 static void Draw(void)
  69 {
  70    static float f = 0;
  71    while (1) {
  72       f += .1;
  73       glClearColor((sin(f)+1)/2.0,(cos(f)+1)/2.0,0.5,1);
  74       glClear(GL_COLOR_BUFFER_BIT);
  75       glutSwapBuffers();
  76
  77       {
  78          static GLint T0 = 0;
  79          static GLint Frames = 0;
  80          GLint t = glutGet(GLUT_ELAPSED_TIME);
  81
  82          Frames++;
  83
  84          if (t - T0 >= 5000) {
  85             GLfloat seconds = (t - T0) / 1000.0;
  86             GLfloat fps = Frames / seconds;
  87             printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps);
  88             fflush(stdout);
  89             T0 = t;
  90             Frames = 0;
  91          }
  92       }
  93
  94    }
  95    glutPostRedisplay();
  96 }
  97
  98 static GLenum Args(int argc, char **argv)
  99 {
 100     return GL_TRUE;
 101 }
 102
 103 int main(int argc, char **argv)
 104 {
 105     GLenum type;
 106
 107     glutInit(&argc, argv);
 108
 109     if (Args(argc, argv) == GL_FALSE) {
 110         exit(1);
 111     }
 112
 113     glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300);
 114
 115     type = GLUT_RGB | GLUT_ALPHA;
 116     type |= GLUT_DOUBLE;
 117     glutInitDisplayMode(type);
 118
 119     if (glutCreateWindow(*argv) == GL_FALSE) {
 120         exit(1);
 121     }
 122
 123     Init();
 124
 125     glutReshapeFunc(Reshape);
 126     glutKeyboardFunc(Key);
 127     glutDisplayFunc(Draw);
 128     glutMainLoop();
 129     return 0;
 130 }