progs/trivial/tri-square.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
  31 #define CI_OFFSET_1 16
  32 #define CI_OFFSET_2 32
  33
  34
  35 GLenum doubleBuffer;
  36
  37 static void Init(void)
  38 {
  39    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  40    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  41    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  42    fflush(stderr);
  43
  44     glClearColor(0.0, 0.0, 1.0, 0.0);
  45 }
  46
  47 static void Reshape(int width, int height)
  48 {
  49
  50     glViewport(0, 0, (GLint)width, (GLint)height);
  51
  52     glMatrixMode(GL_PROJECTION);
  53     glLoadIdentity();
  54     gluOrtho2D(0, (GLdouble)width, 0, (GLdouble)height);
  55     glMatrixMode(GL_MODELVIEW);
  56     glLoadIdentity();
  57 }
  58
  59 static void Key(unsigned char key, int x, int y)
  60 {
  61
  62     switch (key) {
  63       case 27:
  64         exit(1);
  65       default:
  66         break;
  67     }
  68
  69     glutPostRedisplay();
  70 }
  71
  72 static void Draw(void)
  73 {
  74    glClear(GL_COLOR_BUFFER_BIT);
  75
  76    glColor3f(1,1,1);
  77
  78    glBegin(GL_TRIANGLES);
  79    glVertex3f( 10, 10, -30.0);
  80    glVertex3f( 200, 150, -30.0);
  81    glVertex3f( 10, 200, -30.0);
  82    glEnd();
  83
  84    glFlush();
  85
  86    if (doubleBuffer) {
  87       glutSwapBuffers();
  88    }
  89 }
  90
  91 static GLenum Args(int argc, char **argv)
  92 {
  93     GLint i;
  94
  95     doubleBuffer = GL_FALSE;
  96
  97     for (i = 1; i < argc; i++) {
  98         if (strcmp(argv[i], "-sb") == 0) {
  99             doubleBuffer = GL_FALSE;
 100         } else if (strcmp(argv[i], "-db") == 0) {
 101             doubleBuffer = GL_TRUE;
 102         } else {
 103             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 104             return GL_FALSE;
 105         }
 106     }
 107     return GL_TRUE;
 108 }
 109
 110 int main(int argc, char **argv)
 111 {
 112     GLenum type;
 113
 114     glutInit(&argc, argv);
 115
 116     if (Args(argc, argv) == GL_FALSE) {
 117         exit(1);
 118     }
 119
 120     glutInitWindowPosition(100, 0); glutInitWindowSize( 250, 250);
 121
 122     type = GLUT_RGB;
 123     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 124     glutInitDisplayMode(type);
 125
 126     if (glutCreateWindow(*argv) == GL_FALSE) {
 127         exit(1);
 128     }
 129
 130     Init();
 131
 132     glutReshapeFunc(Reshape);
 133     glutKeyboardFunc(Key);
 134     glutDisplayFunc(Draw);
 135     glutMainLoop();
 136         return 0;
 137 }