2 * Copyright © 2008 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
31 static int win_width
, win_height
;
34 line(GLfloat x1
, GLfloat y1
, GLfloat x2
, GLfloat y2
)
43 line3(GLfloat x1
, GLfloat y1
, GLfloat z1
, GLfloat x2
, GLfloat y2
, GLfloat z2
)
46 glVertex3f(x1
, y1
, z1
);
47 glVertex3f(x2
, y2
, z2
);
54 glPolygonMode(GL_FRONT_AND_BACK
, GL_LINE
);
56 glClearColor(0.0, 0.0, 0.0, 0.0);
57 glClear(GL_COLOR_BUFFER_BIT
);
59 glColor3f(1.0, 0.0, 0.0);
60 /* clipped along xmin */
61 glBegin(GL_TRIANGLES
);
62 glVertex2f(-20, win_height
/ 2 - 20);
63 glVertex2f(20, win_height
/ 2);
64 glVertex2f(-20, win_height
/ 2 + 20);
67 glColor3f(0.0, 1.0, 0.0);
68 /* clipped along ymax */
69 glBegin(GL_TRIANGLES
);
70 glVertex2f(win_height
/ 2 - 20, win_height
+ 20);
71 glVertex2f(win_height
/ 2, win_height
- 20);
72 glVertex2f(win_height
/ 2 + 20, win_height
+ 20);
75 glColor3f(0.0, 0.0, 1.0);
76 /* clipped along xmax */
77 glBegin(GL_TRIANGLES
);
78 glVertex2f(win_height
+ 20, win_height
/ 2 - 20);
79 glVertex2f(win_height
- 20, win_height
/ 2);
80 glVertex2f(win_height
+ 20, win_height
/ 2 + 20);
83 glColor3f(1.0, 1.0, 1.0);
84 /* clipped along ymin */
85 glBegin(GL_TRIANGLES
);
86 glVertex2f(win_height
/ 2 - 20, -20);
87 glVertex2f(win_height
/ 2, 20);
88 glVertex2f(win_height
/ 2 + 20, -20);
91 /* clipped along near */
92 glColor3f(1.0, 0.0, 1.0);
93 glBegin(GL_TRIANGLES
);
94 glVertex3f(win_width
/ 2 - 20, win_height
/ 2 - 20, 0.5);
95 glVertex3f(win_width
/ 2 - 40, win_height
/ 2, -0.5);
96 glVertex3f(win_width
/ 2 - 20, win_height
/ 2 + 20, 0.5);
99 /* clipped along far */
100 glColor3f(0.0, 1.0, 1.0);
101 glBegin(GL_TRIANGLES
);
102 glVertex3f(win_width
/ 2 + 20, win_height
/ 2 - 20, 0.5);
103 glVertex3f(win_width
/ 2 + 40, win_height
/ 2, 1.5);
104 glVertex3f(win_width
/ 2 + 20, win_height
/ 2 + 20, 0.5);
107 /* entirely clipped along near/far */
108 glColor3f(.5, .5, .5);
109 glBegin(GL_TRIANGLES
);
110 glVertex3f(win_width
/ 2 - 20, win_height
/ 2 + 20, -0.5);
111 glVertex3f(win_width
/ 2, win_height
/ 2 + 40, -0.5);
112 glVertex3f(win_width
/ 2 + 20, win_height
/ 2 + 20, -0.5);
115 glBegin(GL_TRIANGLES
);
116 glVertex3f(win_width
/ 2 - 20, win_height
/ 2 - 20, 1.5);
117 glVertex3f(win_width
/ 2, win_height
/ 2 - 40, 1.5);
118 glVertex3f(win_width
/ 2 + 20, win_height
/ 2 - 20, 1.5);
121 glColor3f(.5, .5, .5);
122 line3(win_width
/ 2, win_height
/ 2 - 20, 1.5,
123 win_width
/ 2, win_height
/ 2 + 20, 1.5);
125 glColor3f(1.0, 1.0, 0.0);
126 /* clipped along both x and y limits */
127 glBegin(GL_TRIANGLES
); /* xmin, ymin */
132 glBegin(GL_TRIANGLES
); /* xmin, ymax */
133 glVertex2f(-5, win_height
- 20);
134 glVertex2f(20, win_height
- 20);
135 glVertex2f(20, win_height
+ 5);
137 glBegin(GL_TRIANGLES
); /* xmax, ymax */
138 glVertex2f(win_width
- 20, win_height
+ 5);
139 glVertex2f(win_width
- 20, win_height
- 20);
140 glVertex2f(win_width
+ 5, win_height
- 20);
142 glBegin(GL_TRIANGLES
); /* xmax, ymin */
143 glVertex2f(win_width
+ 5, 20);
144 glVertex2f(win_width
- 20, 20);
145 glVertex2f(win_width
- 20, -5);
152 reshape(int width
, int height
)
156 glViewport(0, 0, width
, height
);
158 glMatrixMode(GL_PROJECTION
);
160 glOrtho(0, win_width
, 0, win_height
, 0.0, -1.0);
162 glMatrixMode(GL_MODELVIEW
);
164 glTranslatef(.25, .25, 0);
167 static void key( unsigned char key
, int x
, int y
)
187 main(int argc
, char *argv
[])
192 glutInit(&argc
, argv
);
193 glutInitWindowPosition(0, 0);
194 glutInitWindowSize(win_width
, win_height
);
195 glutInitDisplayMode(GLUT_RGB
| GLUT_DOUBLE
| GLUT_DEPTH
);
196 glutCreateWindow(argv
[0]);
197 glutReshapeFunc(reshape
);
198 glutKeyboardFunc(key
);
199 glutDisplayFunc(display
);