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
|
/*
* render-text.c
*
* Simple text rendering
*
* Copyright (c) 2008 Thomas White <taw27@cam.ac.uk>
*
* This file is part of Thrust3D - a silly game
*
* Thrust3D is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Thrust3D is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Thrust3D. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <png.h>
#include <stdlib.h>
#include <glew.h>
#include "render.h"
#include "texture.h"
void render_text_setup(RenderContext *r) {
texture_load(r, "font");
}
void render_text_write(GLfloat x, GLfloat y, const char *text, RenderContext *r) {
Texture *texture;
int i;
const GLfloat lwidth = 0.03;
const GLfloat lheight = lwidth*r->aspect;
const GLfloat lspacing = lwidth/10.0;
y -= lheight;
texture = texture_lookup(r, "font");
glBindTexture(GL_TEXTURE_2D, texture->texname);
glEnable(GL_TEXTURE_2D);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glBegin(GL_QUADS);
for ( i=0; i<strlen(text); i++ ) {
int idx;
int tx, ty;
GLfloat txc, tyc;
const GLfloat unit = 1.0/8.0;
char c;
c = text[i];
if ( c == ' ' ) {
x += lwidth + lspacing;
continue;
}
if ( c == '-' ) {
c = 'Z' + 1;
}
if ( (c == '\r') || (c == '\n') ) {
continue;
}
idx = toupper(c) - 'A';
tx = idx % 8; ty = idx / 8;
txc = tx * unit;
tyc = (1.0-unit) - ty * unit;
glColor3f(0.4, 0.4, 0.4);
glTexCoord2f(txc, tyc);
glVertex2f(x, y);
glTexCoord2f(txc+unit, tyc);
glVertex2f(x+lwidth, y);
glColor3f(0.8, 0.8, 0.8);
glTexCoord2f(txc+unit, tyc+unit);
glVertex2f(x+lwidth, y+lheight);
glTexCoord2f(txc, tyc+unit);
glVertex2f(x, y+lheight);
x += lwidth + lspacing;
}
glEnd();
glDisable(GL_TEXTURE_2D);
}
|
