accum.c revision 32001f49 
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#include <stdio.h>
25#include <string.h>
26#include <stdlib.h>
27#include "glut_wrap.h"
28
29
30GLenum doubleBuffer;
31GLint thing1, thing2;
32
33
34static void Init(void)
35{
36
37    glClearColor(0.0, 0.0, 0.0, 0.0);
38    glClearAccum(0.0, 0.0, 0.0, 0.0);
39
40    thing1 = glGenLists(1);
41    glNewList(thing1, GL_COMPILE);
42	glColor3f(1.0, 0.0, 0.0);
43	glRectf(-1.0, -1.0, 1.0, 0.0);
44    glEndList();
45
46    thing2 = glGenLists(1);
47    glNewList(thing2, GL_COMPILE);
48	glColor3f(0.0, 1.0, 0.0);
49	glRectf(0.0, -1.0, 1.0, 1.0);
50    glEndList();
51}
52
53static void Reshape(int width, int height)
54{
55
56    glViewport(0, 0, (GLint)width, (GLint)height);
57
58    glMatrixMode(GL_PROJECTION);
59    glLoadIdentity();
60    glMatrixMode(GL_MODELVIEW);
61    glLoadIdentity();
62}
63
64static void Key(unsigned char key, int x, int y)
65{
66    (void) x;
67    (void) y;
68    switch (key) {
69      case 27:
70	exit(1);
71      case '1':
72	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
73	break;
74      case '2':
75	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
76	break;
77      default:
78	return;
79    }
80
81    glutPostRedisplay();
82}
83
84static void Draw(void)
85{
86
87    glPushMatrix();
88
89    glScalef(0.8, 0.8, 1.0);
90
91    glClear(GL_COLOR_BUFFER_BIT);
92    glCallList(thing1);
93    glAccum(GL_LOAD, 0.5);
94
95    glClear(GL_COLOR_BUFFER_BIT);
96    glCallList(thing2);
97    glAccum(GL_ACCUM, 0.5);
98
99    glAccum(GL_RETURN, 1.0);
100
101    glPopMatrix();
102
103    glFlush();
104
105    if (doubleBuffer) {
106	glutSwapBuffers();
107    }
108}
109
110static GLenum Args(int argc, char **argv)
111{
112    GLint i;
113
114    doubleBuffer = GL_FALSE;
115
116    for (i = 1; i < argc; i++) {
117	if (strcmp(argv[i], "-sb") == 0) {
118	    doubleBuffer = GL_FALSE;
119	} else if (strcmp(argv[i], "-db") == 0) {
120	    doubleBuffer = GL_TRUE;
121	} else {
122	    printf("%s (Bad option).\n", argv[i]);
123	    return GL_FALSE;
124	}
125    }
126    return GL_TRUE;
127}
128
129int main(int argc, char **argv)
130{
131    GLenum type;
132
133    glutInit(&argc, argv);
134
135    if (Args(argc, argv) == GL_FALSE) {
136	exit(1);
137    }
138
139    glutInitWindowPosition(0, 0);
140    glutInitWindowSize( 300, 300);
141
142    type = GLUT_RGB | GLUT_ACCUM;
143    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
144    glutInitDisplayMode(type);
145
146    if (glutCreateWindow("Accum Test") == GL_FALSE) {
147	exit(1);
148    }
149
150    Init();
151
152    glutReshapeFunc(Reshape);
153    glutKeyboardFunc(Key);
154    glutDisplayFunc(Draw);
155    glutMainLoop();
156	return 0;
157}
158