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
|
#include "text.hpp"
#include "events/render.hpp"
#include <iostream>
void TextSystem::configure([[maybe_unused]] entityx::EntityManager& entities,
[[maybe_unused]] entityx::EventManager& events)
{
if (FT_Init_FreeType(&freetype) != 0) {
// TODO handle error
}
shouldUpdateVBOs = false;
}
/**
* Draws the text for all entities.
*/
void TextSystem::update([[maybe_unused]] entityx::EntityManager& entites,
entityx::EventManager& events,
[[maybe_unused]] entityx::TimeDelta dt)
{
if (shouldUpdateVBOs) {
shouldUpdateVBOs = false;
updateVBOs();
for (auto& data : fontData) {
auto& d = data.second;
if (d.text.size() == 0)
continue;
// TODO make normal
events.emit<NewRenderEvent>(d.vbo, d.tex, 0, d.buffer.size());
}
}
}
void TextSystem::loadFont(const std::string& name,
const std::string& file,
int size)
{
// Find or load font at given size
//
if (fonts.find(file) == fonts.end()) {
FT_Face face;
if (FT_New_Face(freetype, file.c_str(), 0, &face)) {
// TODO handle this error
}
fonts.emplace(file, face);
}
auto& face = fonts[file];
FT_Set_Pixel_Sizes(face, 0, size);
fontData.try_emplace(name);
// Calculate dimensions of final texture
//
float width = 0, height = 0;
for (int c = 32; c < 128; c++) {
FT_Load_Char(face, c, FT_LOAD_RENDER);
width += face->glyph->bitmap.width + 1;
height = std::max(height, static_cast<float>(face->glyph->bitmap.rows));
}
// Generate texture to hold entire font
//
auto& font = fontData[name];
glGenTextures(1, &font.tex);
glGenBuffers(1, &font.vbo);
glBindTexture(GL_TEXTURE_2D, font.tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width, height,
0, GL_RED, GL_UNSIGNED_BYTE, 0);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// // convert red-on-black to RGBA
// auto& g = face->glyph;
// std::vector<uint32_t> buf (g->bitmap.width * g->bitmap.rows, 0xFFFFFF);
// for (auto j = buf.size(); j--;)
// buf[j] |= g->bitmap.buffer[j] << 24;
// Load each character and add it to the texture
//
float offsetX = 0, offsetY = 0;
for (int c = 32; c < 128; c++) {
FT_Load_Char(face, c, FT_LOAD_RENDER);
auto* g = face->glyph;
glTexSubImage2D(GL_TEXTURE_2D, 0, offsetX, offsetY,
g->bitmap.width, g->bitmap.rows,
GL_RED, GL_UNSIGNED_BYTE,
g->bitmap.buffer);
auto& d = font.data[c - 32];
d.dim = { g->bitmap.width, g->bitmap.rows };
d.bitmap = { g->bitmap_left, g->bitmap_top };
d.advance = { g->advance.x >> 6, g->advance.y >> 6 };
d.offset = { offsetX / width, offsetY / height };
offsetX += g->bitmap.width;
// Keep offsetY at zero?
}
std::cout << "Loaded font: " << file << " (size: " << size << ", tex: "
<< font.tex << ")" << std::endl;
}
void TextSystem::put(const std::string& font,
float x,
float y,
const std::string& text)
{
if (fontData.find(font) == fontData.end())
return;
fontData[font].text.emplace_back(text, x, y, -9.0f);
shouldUpdateVBOs = true;
}
void TextSystem::updateVBOs(void)
{
for (auto& data : fontData) {
auto& d = data.second;
d.buffer.clear();
for (auto& text : d.text) {
for (char c : text.text) {
if (c < 32)
continue;
d.buffer += {
text.x, text.y, text.z,
d.data[c].offset.first, d.data[c].offset.second,
1.0f
};
}
}
glBindBuffer(GL_ARRAY_BUFFER, d.vbo);
glBufferData(GL_ARRAY_BUFFER,
d.text.size() * sizeof(TextMeshData), d.text.data(),
GL_STREAM_DRAW);
}
}
|
