progs/samples/cursor.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 GLenum rgb, doubleBuffer, windType;
  32 int windX, windY;
  33 int cursor;
  34
  35
  36 #include "tkmap.c"
  37
  38 static void Init(void)
  39 {
  40     cursor = 0;
  41     glutSetCursor(cursor);
  42     glClearColor(0.0, 0.0, 0.0, 0.0);
  43     glClearIndex(0.0);
  44 }
  45
  46 static void Reshape(int width, int height)
  47 {
  48
  49     windX = width;
  50     windY = height;
  51     glViewport(0, 0, windX, windY);
  52
  53     glMatrixMode(GL_PROJECTION);
  54     glLoadIdentity();
  55     gluOrtho2D(0, windX, 0, windY);
  56     glMatrixMode(GL_MODELVIEW);
  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       case 32:
  66         cursor++;
  67         if (cursor > 19) {
  68             cursor = 0;
  69         }
  70         glutSetCursor(cursor);
  71     }
  72 }
  73
  74 static void Draw(void)
  75 {
  76
  77     glClear(GL_COLOR_BUFFER_BIT);
  78
  79     glBegin(GL_POLYGON);
  80         SetColor(COLOR_BLACK);
  81         glVertex2i(0, 0);
  82         SetColor(COLOR_RED);
  83         glVertex2i(windX, 0);
  84         SetColor(COLOR_GREEN);
  85         glVertex2i(windX, windY);
  86         SetColor(COLOR_BLUE);
  87         glVertex2i(0, windY);
  88     glEnd();
  89
  90     glFlush();
  91
  92     if (doubleBuffer) {
  93         glutSwapBuffers();
  94     }
  95 }
  96
  97 static GLenum Args(int argc, char **argv)
  98 {
  99     GLint i;
 100
 101     rgb = GL_TRUE;
 102     doubleBuffer = GL_FALSE;
 103
 104     for (i = 1; i < argc; i++) {
 105         if (strcmp(argv[i], "-ci") == 0) {
 106             rgb = GL_FALSE;
 107         } else if (strcmp(argv[i], "-rgb") == 0) {
 108             rgb = GL_TRUE;
 109         } else if (strcmp(argv[i], "-sb") == 0) {
 110             doubleBuffer = GL_FALSE;
 111         } else if (strcmp(argv[i], "-db") == 0) {
 112             doubleBuffer = GL_TRUE;
 113         } else {
 114             printf("%s (Bad option).\n", argv[i]);
 115             return GL_FALSE;
 116         }
 117     }
 118     return GL_TRUE;
 119 }
 120
 121 int main(int argc, char **argv)
 122 {
 123     glutInit(&argc, argv);
 124
 125     if (Args(argc, argv) == GL_FALSE) {
 126         exit(1);
 127     }
 128
 129     windX = 300;
 130     windY = 300;
 131     glutInitWindowPosition(0, 0); glutInitWindowSize( windX, windY);
 132
 133     windType = (rgb) ? GLUT_RGB : GLUT_INDEX;
 134     windType |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 135     glutInitDisplayMode(windType);
 136
 137     if (glutCreateWindow("Cursor Test") == GL_FALSE) {
 138         exit(1);
 139     }
 140
 141     InitMap();
 142
 143     Init();
 144
 145     glutReshapeFunc(Reshape);
 146     glutKeyboardFunc(Key);
 147     glutDisplayFunc(Draw);
 148     glutMainLoop();
 149         return 0;
 150 }