2 * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
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.
12 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
14 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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
31 GLint Width = 250, Height = 250;
34 GLboolean Rmask = GL_TRUE, Gmask = GL_FALSE, Bmask = GL_TRUE;
37 static void Init(void)
39 fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
40 fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
41 fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
42 glClearColor(0.0, 0.0, 1.0, 0.0);
45 static void Reshape(int width, int height)
47 glViewport(0, 0, (GLint)width, (GLint)height);
48 glMatrixMode(GL_PROJECTION);
50 glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
51 glMatrixMode(GL_MODELVIEW);
54 static void Key(unsigned char key, int x, int y)
67 glutDestroyWindow(Win);
75 static void Draw(void)
77 printf("ColorMask = %d, %d, %d\n", Rmask, Gmask, Bmask);
80 glClear(GL_COLOR_BUFFER_BIT);
82 /* right triangle: green */
83 glBegin(GL_TRIANGLES);
85 glVertex3f( 0.9, -0.9, -30.0);
86 glVertex3f( 0.9, 0.9, -30.0);
87 glVertex3f(-0.9, 0.0, -30.0);
90 glColorMask(Rmask, Gmask, Bmask, 0);
92 /* left triangle: white&mask: purple middle region: white */
93 glBegin(GL_TRIANGLES);
95 glVertex3f(-0.9, -0.9, -30.0);
96 glVertex3f(-0.9, 0.9, -30.0);
97 glVertex3f( 0.9, 0.0, -30.0);
100 glDisable(GL_SCISSOR_TEST);
109 static GLenum Args(int argc, char **argv)
113 doubleBuffer = GL_FALSE;
115 for (i = 1; i < argc; i++) {
116 if (strcmp(argv[i], "-sb") == 0) {
117 doubleBuffer = GL_FALSE;
119 else if (strcmp(argv[i], "-db") == 0) {
120 doubleBuffer = GL_TRUE;
123 fprintf(stderr, "%s (Bad option).\n", argv[i]);
131 int main(int argc, char **argv)
135 glutInit(&argc, argv);
137 if (Args(argc, argv) == GL_FALSE) {
142 type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
144 glutInitWindowPosition(100, 0); glutInitWindowSize(Width, Height);
145 glutInitDisplayMode(type);
146 Win = glutCreateWindow("First Tri");
148 glutReshapeFunc(Reshape);
149 glutKeyboardFunc(Key);
150 glutDisplayFunc(Draw);