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 "glut_wrap.h"
30
31
32#include "loadppm.c"
33
34GLenum doubleBuffer;
35GLint windW, windH;
36
37char *fileName = 0;
38PPMImage *image;
39float zoom;
40GLint x, y;
41
42static 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
52static 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
66static 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
88static 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
98static 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
130static 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
156int 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}
195