cOglFontAtlas Class Reference

OpenGL OSD 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

OpenGL OSD 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 180 of file openglosd.h.

Constructor & Destructor Documentation

cOglFontAtlas()

cOglFontAtlas::cOglFontAtlas	(	FT_Face	face,
		int	height
	)

Definition at line 289 of file openglosd.cpp.

References GL_CHECK, L_OPENGL, LOGDEBUG2, LOGERROR, LOGWARNING, m_height, m_pGlyph, m_texture, m_width, MAX_CHARCODE, and MIN_CHARCODE.

~cOglFontAtlas()

cOglFontAtlas::~cOglFontAtlas ( void  )

virtual

Definition at line 449 of file openglosd.cpp.

References GL_CHECK, m_pGlyph, m_texture, MAX_CHARCODE, and MIN_CHARCODE.

Member Function Documentation

BindTexture()

void cOglFontAtlas::BindTexture

(

void

)

Definition at line 468 of file openglosd.cpp.

References GL_CHECK, and m_texture.

GetGlyph()

cOglAtlasGlyph * cOglFontAtlas::GetGlyph

(

int

sym

)

const

Definition at line 461 of file openglosd.cpp.

References m_pGlyph, MAX_CHARCODE, and MIN_CHARCODE.

Height()

int cOglFontAtlas::Height ( void  ) const

inline

Definition at line 185 of file openglosd.h.

References m_height.

Width()

int cOglFontAtlas::Width ( void  ) const

inline

Definition at line 186 of file openglosd.h.

References m_width.

Member Data Documentation

m_height

int cOglFontAtlas::m_height = 0

private

Definition at line 191 of file openglosd.h.

Referenced by cOglFontAtlas(), and Height().

m_pGlyph

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

private

Definition at line 192 of file openglosd.h.

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

m_texture

GLuint cOglFontAtlas::m_texture = 0

private

Definition at line 189 of file openglosd.h.

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

m_width

int cOglFontAtlas::m_width = 0

private

Definition at line 190 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