src/trivial/tri-userclip.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 "glut_wrap.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    static GLdouble plane[4] = { -.5, 0, 1, 0 };
  40
  41    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  42    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  43    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  44    fflush(stderr);
  45
  46    glClearColor(0.0, 0.0, 1.0, 0.0);
  47    glClipPlane(GL_CLIP_PLANE0, plane);
  48    glEnable(GL_CLIP_PLANE0);
  49 }
  50
  51 static void Reshape(int width, int height)
  52 {
  53
  54     glViewport(0, 0, (GLint)width, (GLint)height);
  55
  56     glMatrixMode(GL_PROJECTION);
  57     glLoadIdentity();
  58 /*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
  59     glMatrixMode(GL_MODELVIEW);
  60 }
  61
  62 static void Key(unsigned char key, int x, int y)
  63 {
  64
  65     switch (key) {
  66       case 27:
  67         exit(1);
  68       default:
  69         break;
  70     }
  71
  72     glutPostRedisplay();
  73 }
  74
  75 static void Draw(void)
  76 {
  77    glClear(GL_COLOR_BUFFER_BIT);
  78
  79    glBegin(GL_TRIANGLES);
  80    glColor3f(0,0,.7);
  81    glVertex3f( 0.9, -0.9, 0.0);
  82    glColor3f(.8,0,0);
  83    glVertex3f( 0.9,  0.9, 0.0);
  84    glColor3f(0,.9,0);
  85    glVertex3f(-0.9,  0.0, 0.0);
  86    glEnd();
  87
  88    glFlush();
  89
  90    if (doubleBuffer) {
  91       glutSwapBuffers();
  92    }
  93 }
  94
  95 static GLenum Args(int argc, char **argv)
  96 {
  97     GLint i;
  98
  99     doubleBuffer = GL_FALSE;
 100
 101     for (i = 1; i < argc; i++) {
 102         if (strcmp(argv[i], "-sb") == 0) {
 103             doubleBuffer = GL_FALSE;
 104         } else if (strcmp(argv[i], "-db") == 0) {
 105             doubleBuffer = GL_TRUE;
 106         } else {
 107             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 108             return GL_FALSE;
 109         }
 110     }
 111     return GL_TRUE;
 112 }
 113
 114 int main(int argc, char **argv)
 115 {
 116     GLenum type;
 117
 118     glutInit(&argc, argv);
 119
 120     if (Args(argc, argv) == GL_FALSE) {
 121         exit(1);
 122     }
 123
 124     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 125
 126     type = GLUT_RGB | GLUT_ALPHA;
 127     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 128     glutInitDisplayMode(type);
 129
 130     if (glutCreateWindow(*argv) == GL_FALSE) {
 131         exit(1);
 132     }
 133
 134     Init();
 135
 136     glutReshapeFunc(Reshape);
 137     glutKeyboardFunc(Key);
 138     glutDisplayFunc(Draw);
 139     glutMainLoop();
 140         return 0;
 141 }