1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/*
* Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the name of
* Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
* ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "gl_wrap.h"
#include "glut_wrap.h"
static void
Init(void)
{
fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
fflush(stderr);
if (!glutExtensionSupported("GL_ARB_point_sprite")) {
printf("GL_ARB_point_sprite not supported\n");
exit(1);
}
#define SIZE 16
{
GLubyte tex2d[SIZE][SIZE][3];
GLint s, t;
for (s = 0; s < SIZE; s++) {
for (t = 0; t < SIZE; t++) {
#if 1
tex2d[t][s][0] = (s < SIZE / 2) ? 0 : 255;
tex2d[t][s][1] = (t < SIZE / 2) ? 0 : 255;
tex2d[t][s][2] = 0;
#else
tex2d[t][s][0] = s * 255 / (SIZE - 1);
tex2d[t][s][1] = t * 255 / (SIZE - 1);
tex2d[t][s][2] = 0;
#endif
}
}
glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
GL_RGB, GL_UNSIGNED_BYTE, tex2d);
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glEnable(GL_TEXTURE_2D);
}
glEnable(GL_POINT_SPRITE);
glClearColor(0.0, 0.0, 1.0, 0.0);
}
static void
Reshape(int width, int height)
{
glViewport(0, 0, (GLint) width, (GLint) height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
glMatrixMode(GL_MODELVIEW);
}
static void
Key(unsigned char key, int x, int y)
{
if (key == 27)
exit(1);
glutPostRedisplay();
}
static void
Draw(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glPointSize(32.0);
glBegin(GL_POINTS);
glColor3f(1, 1, 1);
glVertex3f(0.0, 0.0, -30.0);
glEnd();
glutSwapBuffers();
}
int
main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitWindowSize(250, 250);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
if (glutCreateWindow(*argv) == GL_FALSE) {
exit(1);
}
Init();
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutDisplayFunc(Draw);
glutMainLoop();
return 0;
}
|
