progs/trivial/tri-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    f += .1;
  72    glClear(GL_COLOR_BUFFER_BIT);
  73
  74    glBegin(GL_TRIANGLES);
  75    glColor3f((sin(f)+1)/2.0,0,0);
  76    glVertex3f(-0.9, -0.9, -30.0);
  77    glColor3f(0,(cos(f)+1)/2.0,0);
  78    glVertex3f( 0.9, -0.9, -30.0);
  79    glColor3f(0,0,.7);
  80    glVertex3f( 0.0,  0.9, -30.0);
  81    glEnd();
  82
  83    glutSwapBuffers();
  84    glutPostRedisplay();
  85 }
  86
  87 static GLenum Args(int argc, char **argv)
  88 {
  89     return GL_TRUE;
  90 }
  91
  92 int main(int argc, char **argv)
  93 {
  94     GLenum type;
  95
  96     glutInit(&argc, argv);
  97
  98     if (Args(argc, argv) == GL_FALSE) {
  99         exit(1);
 100     }
 101
 102     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 103
 104     type = GLUT_RGB | GLUT_ALPHA;
 105     type |= GLUT_DOUBLE;
 106     glutInitDisplayMode(type);
 107
 108     if (glutCreateWindow(*argv) == GL_FALSE) {
 109         exit(1);
 110     }
 111
 112     Init();
 113
 114     glutReshapeFunc(Reshape);
 115     glutKeyboardFunc(Key);
 116     glutDisplayFunc(Draw);
 117     glutMainLoop();
 118     return 0;
 119 }