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 "glut_wrap.h"
29
30
31#define CI_OFFSET_1 16
32#define CI_OFFSET_2 32
33
34
35GLenum doubleBuffer = 1;
36int win;
37
38static void Init(void)
39{
40   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
41   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
42   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
43   fflush(stderr);
44
45   glClearColor(0.3, 0.1, 0.3, 0.0);
46}
47
48static void Reshape(int width, int height)
49{
50   glViewport(0, 0, (GLint)width, (GLint)height);
51
52   glMatrixMode(GL_PROJECTION);
53   glLoadIdentity();
54   glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
55   glMatrixMode(GL_MODELVIEW);
56}
57
58static void Clear(void)
59{
60   fprintf(stderr, "::clearing\n");
61   fflush(stderr);
62
63   glClear(GL_COLOR_BUFFER_BIT);
64}
65
66static void DrawTri(void)
67{
68   fprintf(stderr, "::drawing - tri\n");
69   fflush(stderr);
70
71   glBegin(GL_TRIANGLES);
72   glColor3f(.8,0,0);
73   glVertex3f(-0.9, -0.9, -30.0);
74   glColor3f(0,.9,0);
75   glVertex3f( 0.9, -0.9, -30.0);
76   glColor3f(0,0,.7);
77   glVertex3f( 0.0,  0.9, -30.0);
78   glEnd();
79}
80
81static void DrawClipTri(void)
82{
83   fprintf(stderr, "::drawing - tri clipped\n");
84   fflush(stderr);
85
86   glBegin(GL_TRIANGLES);
87   glColor3f(.8,0,0);
88   glVertex3f(-0.9,  0.9, -30.0);
89   glColor3f(0,.9,0);
90   glVertex3f( 0.9,  0.9, -30.0);
91   glColor3f(0,0,.7);
92   glVertex3f( 0.0, -1.9, -30.0);
93   glEnd();
94}
95
96static void Swap(void)
97{
98   fprintf(stderr, "::swapping\n");
99   fflush(stderr);
100
101   glutSwapBuffers();
102}
103
104static void Flush(void)
105{
106   fprintf(stderr, "::flush\n");
107   fflush(stderr);
108
109   glFlush();
110}
111
112static void Key(unsigned char key, int x, int y)
113{
114   switch (key) {
115      case 27:
116         glutDestroyWindow(win);
117         exit(0);
118      case 't':
119         DrawTri();
120         break;
121      case 'T':
122         DrawClipTri();
123         break;
124      case 'f':
125         Flush();
126         break;
127      case 's':
128         Swap();
129         Clear();
130         break;
131      default:
132         return;
133   }
134}
135
136static void Draw(void)
137{
138   Clear();
139   DrawTri();
140   DrawClipTri();
141   Swap();
142   Clear();
143}
144
145static void
146Usage(void)
147{
148   printf("usage:\n");
149   printf("  t/T    draw a triangle (caps for clipped)\n");
150   printf("  f      flush\n");
151   printf("  s      swap\n");
152}
153
154int main(int argc, char **argv)
155{
156   GLenum type;
157
158   glutInit(&argc, argv);
159
160   glutInitWindowPosition(0, 0);
161   glutInitWindowSize(250, 250);
162
163   type = GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE;
164   glutInitDisplayMode(type);
165
166   win = glutCreateWindow(*argv);
167   if (!win) {
168      exit(1);
169   }
170
171   Init();
172
173   Usage();
174
175   glutReshapeFunc(Reshape);
176   glutKeyboardFunc(Key);
177   glutDisplayFunc(Draw);
178   glutMainLoop();
179   return 0;
180}
181