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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
#include <time.h>
#include <math.h>
#include <string.h>
#include "allegro.h"
#include "alleggl.h"
#ifndef M_PI
#define M_PI 3.1415
#endif
#define NUM_STRINGS 3
#define STRING "Hello World!"
#define STRING0 ("AllegroGL v" AGL_VERSION_STR)
#define STRING1 "Text Drawing"
#define STRING2 "And Font Loading"
#define STRING3 "Example Program"
#define STRING4 "See Our Webpage At:"
#define URL "http://allegrogl.sourceforge.net/"
volatile int chrono = 0;
volatile double angle = 0.0;
void the_timer(void) {
chrono++;
angle += 1.0 / 400.0;
if (angle > M_PI)
angle -= 2 * M_PI;
} END_OF_FUNCTION(the_timer);
int main() {
FONT *lucidia_fnt;
FONT *allegro_fnt;
DATAFILE *dat;
struct {
float x, y, z;
int c;
} coord[NUM_STRINGS];
char *string = STRING;
int i;
allegro_init();
install_allegro_gl();
install_timer();
LOCK_FUNCTION(the_timer);
LOCK_VARIABLE(chrono);
install_int(the_timer, 2);
allegro_gl_clear_settings();
allegro_gl_set(AGL_COLOR_DEPTH, 32);
allegro_gl_set(AGL_Z_DEPTH, 24);
allegro_gl_set(AGL_WINDOWED, TRUE);
allegro_gl_set(AGL_DOUBLEBUFFER, 1);
allegro_gl_set(AGL_RENDERMETHOD, 1);
allegro_gl_set(AGL_SUGGEST, AGL_COLOR_DEPTH | AGL_DOUBLEBUFFER
| AGL_RENDERMETHOD | AGL_Z_DEPTH | AGL_WINDOWED);
if (set_gfx_mode(GFX_OPENGL, 640, 480, 0, 0)) {
allegro_message("Error initializing OpenGL!\n");
return -1;
}
install_keyboard();
/* Load 2 copies of the datafile */
dat = load_datafile("lucidia.dat");
if (!dat) {
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
allegro_message("Unable to load lucidia.dat\n");
return -2;
}
lucidia_fnt = allegro_gl_convert_allegro_font((FONT*)dat[0].dat,
AGL_FONT_TYPE_TEXTURED, 16.0);
if (!lucidia_fnt) {
unload_datafile(dat);
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
allegro_message("Unable to convert font!\n");
return -3;
}
allegro_fnt = allegro_gl_convert_allegro_font(font,
AGL_FONT_TYPE_TEXTURED, 16.0);
if (!allegro_fnt) {
allegro_gl_destroy_font(lucidia_fnt);
unload_datafile(dat);
set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
allegro_message("Unable to convert font!\n");
return -4;
}
srand(time(NULL));
for (i = 0; i < NUM_STRINGS; i++) {
coord[i].z = 0;
coord[i].c = 0;
}
i = 0;
/* Start nice text demo */
/* Setup OpenGL like we want */
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glViewport(0, 0, SCREEN_W, SCREEN_H);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -1.0, 1.0, 1, 60.0);
/* Set culling mode - not that we have anything to cull */
glEnable(GL_CULL_FACE);
glFrontFace(GL_CCW);
glMatrixMode(GL_MODELVIEW);
do {
int c;
/* Update rotation angle of text */
glLoadIdentity();
glTranslatef(0, 0, -30);
glRotatef(-45, 1, 0, 0);
glRotatef(-30, 0, 1, 0);
/* Clear the screen and set a nice blender mode */
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_COLOR);
/* Print the text wheel */
for (i = 0; i < NUM_STRINGS; i++) {
allegro_gl_printf(lucidia_fnt, coord[i].x, coord[i].y, coord[i].z,
coord[i].c, string);
}
/* Update the text wheel's position */
for (i = 0; i < NUM_STRINGS; i++) {
int r, g, b;
float angle2 = angle + i * M_PI * 2 / NUM_STRINGS;
coord[i].x = 10 * cos(angle2) - 10;
coord[i].y = 10 * sin(angle2);
angle2 = angle2 * 180.0 / M_PI;
#if ((((ALLEGRO_VERSION) << 16) | ((ALLEGRO_SUB_VERSION) << 8) | (ALLEGRO_WIP_VERSION)) == 0x40200)
/* Work around an Allegro bug that's only in 4.2.0 */
while (angle2 > 360.0f) angle2 -= 360.0f;
while (angle2 < 0) angle2 += 360.0f;
#endif
hsv_to_rgb(angle2, 1, 1, &r, &g, &b);
coord[i].c = makeacol(r, g, b, 255);
}
/* Draw "AllegroGL" */
glLoadIdentity();
c = MID(0, (int)(255 - chrono / 100), 255);
allegro_gl_printf(allegro_fnt, -(strlen(STRING0) * 1 / 2.0f) / 2,
-3.0f, -chrono / 200.0 + 0, makecol(c, c, c), STRING0);
c = MID(0, (int)(255 - chrono / 100) + 24, 255);
allegro_gl_printf(allegro_fnt, -(strlen(STRING1) * 1 / 2.0f) / 2,
-3.0f, -chrono / 200.0 + 12, makecol(c, c, c), STRING1);
c = MID(0, (int)(255 - chrono / 100) + 48, 255);
allegro_gl_printf(allegro_fnt, -(strlen(STRING2) * 1 / 2.0f) / 2,
-3.0f, -chrono / 200.0 + 24, makecol(c, c, c), STRING2);
c = MID(0, (int)(255 - chrono / 100) + 72, 255);
allegro_gl_printf(allegro_fnt, -(strlen(STRING3) * 1 / 2.0f) / 2,
-3.0f, -chrono / 200.0 + 36, makecol(c, c, c), STRING3);
c = MID(0, (int)(255 - chrono / 100) + 96, 255);
allegro_gl_printf(allegro_fnt, -(strlen(STRING4) * 1 / 2.0f) / 2,
-3.0f, -chrono / 200.0 + 48, makecol(c, c, c), STRING4);
c = MID(0, (int)(255 - chrono / 100) + 120, 255);
allegro_gl_printf(allegro_fnt, -(strlen(URL) * 1 / 2.0f) / 2,
-3.0f, -chrono / 200.0 + 60, makecol(c, c, c), URL);
allegro_gl_flip();
rest(2);
} while (!key[KEY_ESC]);
return 0;
}
END_OF_MAIN()
|
