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
|
#include <string> // For memset
#include "FTGLTextureFont.h"
#include "FTTextureGlyph.h"
inline GLuint NextPowerOf2( GLuint in)
{
in -= 1;
in |= in >> 16;
in |= in >> 8;
in |= in >> 4;
in |= in >> 2;
in |= in >> 1;
return in + 1;
}
FTGLTextureFont::FTGLTextureFont( const char* fontname)
: FTFont( fontname),
maxTextSize(0),
textureWidth(0),
textureHeight(0),
glyphHeight(0),
glyphWidth(0),
padding(3),
xOffset(0),
yOffset(0)
{
remGlyphs = numGlyphs = face.GlyphCount();
}
FTGLTextureFont::FTGLTextureFont( const unsigned char *pBufferBytes, size_t bufferSizeInBytes)
: FTFont( pBufferBytes, bufferSizeInBytes),
maxTextSize(0),
textureWidth(0),
textureHeight(0),
glyphHeight(0),
glyphWidth(0),
padding(3),
xOffset(0),
yOffset(0)
{
remGlyphs = numGlyphs = face.GlyphCount();
}
FTGLTextureFont::~FTGLTextureFont()
{
glDeleteTextures( textureIDList.size(), (const GLuint*)&textureIDList[0]);
}
FTGlyph* FTGLTextureFont::MakeGlyph( unsigned int glyphIndex)
{
FT_GlyphSlot ftGlyph = face.Glyph( glyphIndex, FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP);
if( ftGlyph)
{
glyphHeight = static_cast<int>( charSize.Height());
glyphWidth = static_cast<int>( charSize.Width());
if( textureIDList.empty())
{
textureIDList.push_back( CreateTexture());
xOffset = yOffset = padding;
}
if( xOffset > ( textureWidth - glyphWidth))
{
xOffset = padding;
yOffset += glyphHeight;
if( yOffset > ( textureHeight - glyphHeight))
{
textureIDList.push_back( CreateTexture());
yOffset = padding;
}
}
FTTextureGlyph* tempGlyph = new FTTextureGlyph( ftGlyph, textureIDList[textureIDList.size() - 1],
xOffset, yOffset, textureWidth, textureHeight);
xOffset += static_cast<int>( tempGlyph->BBox().upperX - tempGlyph->BBox().lowerX + padding);
--remGlyphs;
return tempGlyph;
}
err = face.Error();
return NULL;
}
void FTGLTextureFont::CalculateTextureSize()
{
if( !maxTextSize)
{
glGetIntegerv( GL_MAX_TEXTURE_SIZE, (GLint*)&maxTextSize);
}
textureWidth = NextPowerOf2( (remGlyphs * glyphWidth) + ( padding * 2));
if( textureWidth > maxTextSize)
{
textureWidth = maxTextSize;
}
int h = static_cast<int>( (textureWidth - ( padding * 2)) / glyphWidth);
textureHeight = NextPowerOf2( (( numGlyphs / h) + 1) * glyphHeight);
textureHeight = textureHeight > maxTextSize ? maxTextSize : textureHeight;
}
GLuint FTGLTextureFont::CreateTexture()
{
CalculateTextureSize();
int totalMemory = textureWidth * textureHeight;
unsigned char* textureMemory = new unsigned char[totalMemory];
memset( textureMemory, 0, totalMemory);
GLuint textID;
glGenTextures( 1, (GLuint*)&textID);
glBindTexture( GL_TEXTURE_2D, textID);
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D( GL_TEXTURE_2D, 0, GL_ALPHA, textureWidth, textureHeight, 0, GL_ALPHA, GL_UNSIGNED_BYTE, textureMemory);
delete [] textureMemory;
return textID;
}
bool FTGLTextureFont::FaceSize( const unsigned int size, const unsigned int res)
{
if( !textureIDList.empty())
{
glDeleteTextures( textureIDList.size(), (const GLuint*)&textureIDList[0]);
remGlyphs = numGlyphs = face.GlyphCount();
}
return FTFont::FaceSize( size, res);
}
void FTGLTextureFont::Render( const char* string)
{
// glPushAttrib( GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
glEnable(GL_BLEND);
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // GL_ONE
FTFont::Render( string);
// glPopAttrib();
}
void FTGLTextureFont::Render( const wchar_t* string)
{
// glPushAttrib( GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
glEnable(GL_BLEND);
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // GL_ONE
FTFont::Render( string);
// glPopAttrib();
}
|
