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
  42     glClearColor(0.3, 0.1, 0.3, 0.0);
  43 }
  44
  45 static void Reshape(int width, int height)
  46 {
  47
  48     glViewport(0, 0, (GLint)width, (GLint)height);
  49
  50     glMatrixMode(GL_PROJECTION);
  51     glLoadIdentity();
  52     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  53     glMatrixMode(GL_MODELVIEW);
  54 }
  55
  56 static void Key(unsigned char key, int x, int y)
  57 {
  58    switch (key) {
  59    case 27:
  60       exit(0);
  61    default:
  62       glutPostRedisplay();
  63       return;
  64    }
  65 }
  66
  67 static void Draw(void)
  68 {
  69    static float f = 0;
  70    while (1) {
  71       f += .1;
  72       glClearColor((sin(f)+1)/2.0,(cos(f)+1)/2.0,0.5,1);
  73       glClear(GL_COLOR_BUFFER_BIT);
  74       glutSwapBuffers();
  75
  76       {
  77          static GLint T0 = 0;
  78          static GLint Frames = 0;
  79          GLint t = glutGet(GLUT_ELAPSED_TIME);
  80
  81          Frames++;
  82
  83          if (t - T0 >= 5000) {
  84             GLfloat seconds = (t - T0) / 1000.0;
  85             GLfloat fps = Frames / seconds;
  86             printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps);
  87             fflush(stdout);
  88             T0 = t;
  89             Frames = 0;
  90          }
  91       }
  92
  93    }
  94    glutPostRedisplay();
  95 }
  96
  97 static GLenum Args(int argc, char **argv)
  98 {
  99     return GL_TRUE;
 100 }
 101
 102 int main(int argc, char **argv)
 103 {
 104     GLenum type;
 105
 106     glutInit(&argc, argv);
 107
 108     if (Args(argc, argv) == GL_FALSE) {
 109         exit(1);
 110     }
 111
 112     glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300);
 113
 114     type = GLUT_RGB | GLUT_ALPHA;
 115     type |= GLUT_DOUBLE;
 116     glutInitDisplayMode(type);
 117
 118     if (glutCreateWindow(*argv) == GL_FALSE) {
 119         exit(1);
 120     }
 121
 122     Init();
 123
 124     glutReshapeFunc(Reshape);
 125     glutKeyboardFunc(Key);
 126     glutDisplayFunc(Draw);
 127     glutMainLoop();
 128     return 0;
 129 }