-
Notifications
You must be signed in to change notification settings - Fork 0
/
text_renderer.c
189 lines (173 loc) · 6.81 KB
/
text_renderer.c
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
#include "text_renderer.h"
#include "opengl.h"
#include <string.h>
#include <ctype.h>
const GLfloat vertices[] = {
0.0f, 0.0f,
1.0f, 0.0f,
2.0f, 0.0f,
3.0f, 0.0f,
4.0f, 0.0f,
0.0f, 1.0f,
2.0f, 1.0f,
4.0f, 1.0f,
0.0f, 2.0f,
1.0f, 2.0f,
2.0f, 2.0f,
3.0f, 2.0f,
4.0f, 2.0f,
0.0f, 3.0f,
2.0f, 3.0f,
4.0f, 3.0f,
0.0f, 4.0f,
1.0f, 4.0f,
2.0f, 4.0f,
3.0f, 4.0f,
4.0f, 4.0f,
};
/**
0 1 2 3 4
5 6 7
8 9 10 11 12
13 14 15
16 17 18 19 20
*/
const GLubyte A[] = { 2, /**/ 6, 2, /**/ 16, 5, 1, 3, 7, 20, /**/ 8, 12 };
const GLubyte B[] = { 2, /**/ 6, 4, /**/ 16, 0, 3, 7, 11, 8, /**/ 11, 15, 19, 16 };
const GLubyte C[] = { 1, /**/ 6, /**/ 4, 1, 5, 13, 17, 20 };
const GLubyte D[] = { 1, /**/ 7, /**/ 16, 0, 3, 7, 15, 19, 16 };
const GLubyte E[] = { 2, /**/ 4, 2, /**/ 4, 0, 16, 20, /**/ 8, 11 };
const GLubyte F[] = { 2, /**/ 3, 2, /**/ 4, 0, 16, /**/ 8, 11 };
const GLubyte G[] = { 1, /**/ 9, /**/ 7, 3, 1, 5, 13, 17, 20, 12, 11 };
const GLubyte H[] = { 3, /**/ 2, 2, 2, /**/ 0, 16, /**/ 8, 12, /**/ 4, 20 };
const GLubyte I[] = { 3, /**/ 2, 2, 2, /**/ 0, 4, /**/ 2, 18, /**/ 16, 20 };
const GLubyte J[] = { 1, /**/ 6, /**/ 3, 4, 15, 19, 17, 13 };
const GLubyte K[] = { 2, /**/ 3, 3, /**/ 0, 8, 4, /**/ 16, 8, 20 };
const GLubyte L[] = { 1, /**/ 3, /**/ 0, 16, 20 };
const GLubyte M[] = { 1, /**/ 5, /**/ 16, 0, 6, 4, 20 };
const GLubyte N[] = { 1, /**/ 5, /**/ 16, 0, 3, 7, 20 };
const GLubyte O[] = { 1, /**/ 9, /**/ 1, 3, 7, 15, 19, 17, 13, 5, 1 };
const GLubyte P[] = { 1, /**/ 6, /**/ 16, 0, 3, 7, 11, 8 };
const GLubyte Q[] = { 2, /**/ 9, 2, /**/ 1, 3, 7, 15, 19, 17, 13, 5, 1, /**/ 10, 20 };
const GLubyte R[] = { 2, /**/ 6, 2, /**/ 16, 0, 3, 7, 11, 8, /**/ 10, 20 };
const GLubyte S[] = { 1, /**/ 8, /**/ 4, 1, 5, 9, 11, 15, 19, 16 };
const GLubyte T[] = { 2, /**/ 2, 2, /**/ 0, 4, 2, 18 };
const GLubyte U[] = { 1, /**/ 6, /**/ 0, 13, 17, 19, 15, 4 };
const GLubyte V[] = { 1, /**/ 3, /**/ 0, 18, 4 };
const GLubyte W[] = { 1, /**/ 5, /**/ 0, 16, 14, 20, 4 };
const GLubyte X[] = { 2, /**/ 2, 2, /**/ 0, 20, /**/ 4, 16 };
const GLubyte Y[] = { 2, /**/ 3, 2, /**/ 0, 10, 18, /**/ 4, 10 };
const GLubyte Z[] = { 1, /**/ 4, /**/ 0, 4, 16, 20 };
const GLubyte DIGIT_0[] = { 1, /**/ 6, /**/ 16, 4, 20, 16, 0, 4 };
const GLubyte DIGIT_1[] = { 2, /**/ 3, 2, /**/ 1, 2, 18, /**/ 16, 20 };
const GLubyte DIGIT_2[] = { 1, /**/ 6, /**/ 0, 4, 12, 8, 16, 20 };
const GLubyte DIGIT_3[] = { 2, /**/ 4, 2, /**/ 0, 4, 20, 16, /**/ 9, 12 };
const GLubyte DIGIT_4[] = { 2, /**/ 3, 2, /**/ 0, 8, 12, /**/ 7, 20 };
const GLubyte DIGIT_5[] = { 1, /**/ 6, /**/ 4, 0, 8, 12, 20, 16 };
const GLubyte DIGIT_6[] = { 1, /**/ 5, /**/ 0, 16, 20, 12, 8 };
const GLubyte DIGIT_7[] = { 1, /**/ 3, /**/ 1, 4, 20 };
const GLubyte DIGIT_8[] = { 2, /**/ 5, 2, /**/ 0, 4, 20, 16, 0, /**/ 8, 12 };
const GLubyte DIGIT_9[] = { 1, /**/ 5, /**/ 20, 4, 0, 8, 12 };
const GLubyte SYMBOL_DOT[] = { 1, /**/ 2, /**/ 14, 18 };
const GLubyte SYMBOL_COMMA[] = { 1, /**/ 3, /**/ 14, 18, 17 };
const GLubyte SYMBOL_SPACE[] = { 0 };
const GLubyte SYMBOL_DCOLON[] = { 2, /**/ 2, 2, /**/ 14, 18, /**/ 6, 10 };
const GLubyte SYMBOL_PERCENT[] = { 3, /**/ 2, 2, 2, /**/ 4, 16, /**/ 0, 5, /**/ 15, 20 };
const GLubyte SYMBOL_MINUS[] = { 1, /**/ 2, /**/ 8, 12 };
static const GLubyte * get_indices_for_char(char character) {
switch(toupper(character)) {
case 'A': return (const GLubyte *)&A;
case 'B': return (const GLubyte *)&B;
case 'C': return (const GLubyte *)&C;
case 'D': return (const GLubyte *)&D;
case 'E': return (const GLubyte *)&E;
case 'F': return (const GLubyte *)&F;
case 'G': return (const GLubyte *)&G;
case 'H': return (const GLubyte *)&H;
case 'I': return (const GLubyte *)&I;
case 'J': return (const GLubyte *)&J;
case 'K': return (const GLubyte *)&K;
case 'L': return (const GLubyte *)&L;
case 'M': return (const GLubyte *)&M;
case 'N': return (const GLubyte *)&N;
case 'O': return (const GLubyte *)&O;
case 'P': return (const GLubyte *)&P;
case 'Q': return (const GLubyte *)&Q;
case 'R': return (const GLubyte *)&R;
case 'S': return (const GLubyte *)&S;
case 'T': return (const GLubyte *)&T;
case 'U': return (const GLubyte *)&U;
case 'V': return (const GLubyte *)&V;
case 'W': return (const GLubyte *)&W;
case 'X': return (const GLubyte *)&X;
case 'Y': return (const GLubyte *)&Y;
case 'Z': return (const GLubyte *)&Z;
case '0': return (const GLubyte *)&DIGIT_0;
case '1': return (const GLubyte *)&DIGIT_1;
case '2': return (const GLubyte *)&DIGIT_2;
case '3': return (const GLubyte *)&DIGIT_3;
case '4': return (const GLubyte *)&DIGIT_4;
case '5': return (const GLubyte *)&DIGIT_5;
case '6': return (const GLubyte *)&DIGIT_6;
case '7': return (const GLubyte *)&DIGIT_7;
case '8': return (const GLubyte *)&DIGIT_8;
case '9': return (const GLubyte *)&DIGIT_9;
case '.': return (const GLubyte *)&SYMBOL_DOT;
case ',': return (const GLubyte *)&SYMBOL_COMMA;
case ' ': return (const GLubyte *)&SYMBOL_SPACE;
case ':': return (const GLubyte *)&SYMBOL_DCOLON;
case '%': return (const GLubyte *)&SYMBOL_PERCENT;
case '-': return (const GLubyte *)&SYMBOL_MINUS;
// case '+': return plus;
// case '_': return underscore;
// case '/': return slash;
// case ' ': return space;
default: return NULL;
}
}
static void start_character_rendering() {
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, vertices);
glPushMatrix();
glScalef(1.4f, -3.0f, 1.0f);
}
static void render_char(char character) {
const GLubyte * indices = get_indices_for_char(character);
if (indices == NULL)
return;
const unsigned int draw_count = indices[0];
unsigned int offset = draw_count + 1;
for (unsigned int i = 0; i < draw_count; i++) {
const GLsizei indices_length = indices[i+1];
glDrawElements(GL_LINE_STRIP, indices_length, GL_UNSIGNED_BYTE, indices + offset);
offset += indices_length;
}
}
static void stop_character_rendering() {
glDisableClientState(GL_VERTEX_ARRAY);
glPopMatrix();
}
void text_renderer_render_character(char character) {
start_character_rendering();
render_char(character);
stop_character_rendering();
}
void text_renderer_render_string(const char * string, int length) {
if (length) {
start_character_rendering();
size_t line_length = 0;
glTranslatef(0.5f, 0.5f, 0.0f);
for (size_t i = 0; i < length; i++) {
const char character = string[i];
if (character == '\n') {
glTranslatef(line_length * -6.0f, 6.0f, 0.0f);
line_length = 0;
} else {
line_length++;
render_char(character);
glTranslatef(6.0f, 0.0f, 0.0f);
}
}
stop_character_rendering();
}
}