progs/trivial/quadstrip-cont.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 <GL/glut.h>
  29
  30 GLenum doubleBuffer;
  31
  32 static void Init(void)
  33 {
  34    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  35    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  36    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  37    fflush(stderr);
  38
  39     glClearColor(0.0, 0.0, 1.0, 0.0);
  40 }
  41
  42 static void Reshape(int width, int height)
  43 {
  44
  45     glViewport(0, 0, (GLint)width, (GLint)height);
  46
  47     glMatrixMode(GL_PROJECTION);
  48     glLoadIdentity();
  49     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  50     glMatrixMode(GL_MODELVIEW);
  51 }
  52
  53 static void Key(unsigned char key, int x, int y)
  54 {
  55
  56     switch (key) {
  57       case 27:
  58         exit(1);
  59       default:
  60         break;
  61     }
  62
  63     glutPostRedisplay();
  64 }
  65
  66 static void Draw(void)
  67 {
  68    glClear(GL_COLOR_BUFFER_BIT);
  69
  70    glBegin(GL_QUAD_STRIP);
  71    glColor3f(1,0,0);
  72    glVertex3f( 0.9, -0.9, -30.0);
  73    glColor3f(1,1,0);
  74    glVertex3f( 0.9,  0.9, -30.0);
  75
  76    glColor3f(1,0,0);
  77    glVertex3f( 0.1, -0.8, -30.0);
  78    glColor3f(1,1,0);
  79    glVertex3f( 0.1,  0.8, -30.0);
  80
  81    glColor3f(0,1,1);
  82    glVertex3f(-0.1,  -0.9, -30.0);
  83    glColor3f(1,0,1);
  84    glVertex3f(-0.1,  0.9, -30.0);
  85
  86    glColor3f(0,1,1);
  87    glVertex3f(-0.9,  -0.8, -30.0);
  88    glColor3f(1,0,1);
  89    glVertex3f(-0.9,  0.8, -30.0);
  90    glEnd();
  91
  92    glFlush();
  93
  94    if (doubleBuffer) {
  95       glutSwapBuffers();
  96    }
  97 }
  98
  99 static void
 100 idle(void)
 101 {
 102   glutPostRedisplay();
 103 }
 104
 105
 106 static void
 107 visible(int vis)
 108 {
 109   if (vis == GLUT_VISIBLE)
 110     glutIdleFunc(idle);
 111   else
 112     glutIdleFunc(NULL);
 113 }
 114
 115
 116 static GLenum Args(int argc, char **argv)
 117 {
 118     GLint i;
 119
 120     doubleBuffer = GL_FALSE;
 121
 122     for (i = 1; i < argc; i++) {
 123         if (strcmp(argv[i], "-sb") == 0) {
 124             doubleBuffer = GL_FALSE;
 125         } else if (strcmp(argv[i], "-db") == 0) {
 126             doubleBuffer = GL_TRUE;
 127         } else {
 128             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 129             return GL_FALSE;
 130         }
 131     }
 132     return GL_TRUE;
 133 }
 134
 135 int main(int argc, char **argv)
 136 {
 137     GLenum type;
 138
 139     glutInit(&argc, argv);
 140
 141     if (Args(argc, argv) == GL_FALSE) {
 142         exit(1);
 143     }
 144
 145     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 146
 147     type = GLUT_RGB;
 148     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 149     glutInitDisplayMode(type);
 150
 151     if (glutCreateWindow(*argv) == GL_FALSE) {
 152         exit(1);
 153     }
 154
 155     Init();
 156
 157     glutReshapeFunc(Reshape);
 158     glutKeyboardFunc(Key);
 159     glutDisplayFunc(Draw);
 160     glutVisibilityFunc(visible);
 161     glutMainLoop();
 162         return 0;
 163 }