cOglFontAtlas Class Reference

Texture Atlas for a Font. More...

#include <openglosd.h>

Public Member Functions
	cOglFontAtlas (FT_Face, int)
virtual	~cOglFontAtlas (void)
cOglAtlasGlyph *	GetGlyph (int) const
int	Height (void) const
int	Width (void) const
void	BindTexture (void)

Private Attributes
GLuint	m_texture = 0
int	m_width = 0
int	m_height = 0
cOglAtlasGlyph *	m_pGlyph [MAX_CHARCODE - MIN_CHARCODE+1]

Detailed Description

Texture Atlas for a Font.

Represents a texture atlas keeping a range of glyphs on one texture per font and size instead of having one texture per glyph. This technique makes dealing with huge amounts of glyphs faster, because the bottleneck (texture up-/download/binding) is reduced at a minimum. Its faster to deal with one single bigger texture than many smaller ones.

The font atlas is prepared once at the time the new font or sized is accessed for the first time. We may have a little delay at startup, which is negligible.

Definition at line 171 of file openglosd.h.

Member Function Documentation

Height()

int cOglFontAtlas::Height ( void  ) const

inline

Definition at line 176 of file openglosd.h.

References m_height.

Width()

int cOglFontAtlas::Width ( void  ) const

inline

Definition at line 177 of file openglosd.h.

References m_width.

Member Data Documentation

m_height

int cOglFontAtlas::m_height = 0

private

Definition at line 182 of file openglosd.h.

Referenced by cOglFontAtlas(), and Height().

m_pGlyph

cOglAtlasGlyph* cOglFontAtlas::m_pGlyph[MAX_CHARCODE - MIN_CHARCODE+1]

private

Definition at line 183 of file openglosd.h.

Referenced by cOglFontAtlas(), GetGlyph(), and ~cOglFontAtlas().

m_texture

GLuint cOglFontAtlas::m_texture = 0

private

Definition at line 180 of file openglosd.h.

Referenced by BindTexture(), cOglFontAtlas(), and ~cOglFontAtlas().

m_width

int cOglFontAtlas::m_width = 0

private

Definition at line 181 of file openglosd.h.

Referenced by cOglFontAtlas(), and Width().

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The documentation for this class was generated from the following files:

• openglosd.h
• openglosd.cpp