progs/samples/copy.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/glew.h>
  29 #include <GL/glut.h>
  30
  31
  32 #include "loadppm.c"
  33
  34 GLenum doubleBuffer;
  35 GLint windW, windH;
  36
  37 char *fileName = 0;
  38 PPMImage *image;
  39 float zoom;
  40 GLint x, y;
  41
  42 static void Init(void)
  43 {
  44
  45     glClearColor(0.0, 0.0, 0.0, 0.0);
  46
  47     x = 0;
  48     y = windH;
  49     zoom = 1.8;
  50 }
  51
  52 static void Reshape(int width, int height)
  53 {
  54
  55     windW = (GLint)width;
  56     windH = (GLint)height;
  57
  58     glViewport(0, 0, windW, windH);
  59
  60     glMatrixMode(GL_PROJECTION);
  61     glLoadIdentity();
  62     gluOrtho2D(0, windW, 0, windH);
  63     glMatrixMode(GL_MODELVIEW);
  64 }
  65
  66 static void Key(unsigned char key, int x, int y)
  67 {
  68
  69     switch (key) {
  70       case 27:
  71         exit(1);
  72       case 'Z':
  73         zoom += 0.2;
  74         break;
  75       case 'z':
  76         zoom -= 0.2;
  77         if (zoom < 0.2) {
  78             zoom = 0.2;
  79         }
  80         break;
  81       default:
  82         return;
  83     }
  84
  85     glutPostRedisplay();
  86 }
  87
  88 static void Mouse(int button, int state, int mouseX, int mouseY)
  89 {
  90     if (state != GLUT_DOWN)
  91         return;
  92     x = (GLint)mouseX;
  93     y = (GLint)mouseY;
  94
  95     glutPostRedisplay();
  96 }
  97
  98 static void Draw(void)
  99 {
 100     GLint src[3], dst[3];
 101
 102     glClear(GL_COLOR_BUFFER_BIT);
 103
 104     src[0] = (int) ((windW / 2.0) - (image->sizeX / 2.0));
 105     src[1] = (int) ((windH / 2.0) - (image->sizeY / 2.0));
 106     src[2] = 0;
 107     glWindowPos3ivARB(src);
 108
 109     glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 110     glPixelZoom(1.0, 1.0);
 111     glDrawPixels(image->sizeX, image->sizeY, GL_RGB, GL_UNSIGNED_BYTE,
 112                  image->data);
 113
 114     dst[0] = x;
 115     dst[1] = windH - y;
 116     dst[2] = 0;
 117     glWindowPos3ivARB(dst);
 118
 119     glPixelZoom(zoom, zoom);
 120     glCopyPixels(src[0], src[1],
 121                  image->sizeX, image->sizeY, GL_COLOR);
 122
 123     glFlush();
 124
 125     if (doubleBuffer) {
 126         glutSwapBuffers();
 127     }
 128 }
 129
 130 static GLenum Args(int argc, char **argv)
 131 {
 132     GLint i;
 133
 134     doubleBuffer = GL_FALSE;
 135
 136     for (i = 1; i < argc; i++) {
 137         if (strcmp(argv[i], "-sb") == 0) {
 138             doubleBuffer = GL_FALSE;
 139         } else if (strcmp(argv[i], "-db") == 0) {
 140             doubleBuffer = GL_TRUE;
 141         } else if (strcmp(argv[i], "-f") == 0) {
 142             if (i+1 >= argc || argv[i+1][0] == '-') {
 143                 printf("-f (No file name).\n");
 144                 return GL_FALSE;
 145             } else {
 146                 fileName = argv[++i];
 147             }
 148         } else {
 149             printf("%s (Bad option).\n", argv[i]);
 150             return GL_FALSE;
 151         }
 152     }
 153     return GL_TRUE;
 154 }
 155
 156 int main(int argc, char **argv)
 157 {
 158     GLenum type;
 159
 160     glutInit(&argc, argv);
 161
 162     if (Args(argc, argv) == GL_FALSE) {
 163         exit(1);
 164     }
 165
 166     if (fileName == 0) {
 167         printf("No image file.\n");
 168         exit(1);
 169     }
 170
 171     image = LoadPPM(fileName);
 172
 173     windW = 2*300;
 174     windH = 2*300;
 175     glutInitWindowPosition(0, 0); glutInitWindowSize( windW, windH);
 176
 177     type = GLUT_RGB;
 178     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 179     glutInitDisplayMode(type);
 180
 181     if (glutCreateWindow("Copy Test") == GL_FALSE) {
 182         exit(1);
 183     }
 184
 185     glewInit();
 186     Init();
 187
 188     glutReshapeFunc(Reshape);
 189     glutKeyboardFunc(Key);
 190     glutMouseFunc(Mouse);
 191     glutDisplayFunc(Draw);
 192     glutMainLoop();
 193         return 0;
 194 }