#include <gls_font_renderer.h>

Public Member Functions
unsigned char	TextureMinFilter ()

void	TextureMinFilter (unsigned char val)

unsigned char	TextureMagFilter ()

void	TextureMagFilter (unsigned char val)

void	SetFont (const GlsFontBase *font)

void	InitRendering (unsigned char textureMinFilter, unsigned char textureMagFilter)

void	InitRendering ()

void	TermRendering ()

void	DrawCharacter (const bool emphasize, const float emphasisOffset, const bool inverse, const GLfloat x1, const GLfloat y1, const GLfloat x2, const GLfloat y2, const GLfloat tx1, const GLfloat ty1, const GLfloat tx2, const GLfloat ty2) const

void	DrawHalo (const float haloOffset, const float diagonalOffset, const GLfloat x1, const GLfloat y1, const GLfloat x2, const GLfloat y2, const GLfloat tx1, const GLfloat ty1, const GLfloat tx2, const GLfloat ty2) const

void	DrawShadow (const float shadowOffset, const GLfloat x1, const GLfloat y1, const GLfloat x2, const GLfloat y2, const GLfloat tx1, const GLfloat ty1, const GLfloat tx2, const GLfloat ty2) const

	GlsFontRenderer (const GlsFontBase *font)

Static Public Member Functions
static void	MapTexture (const GLfloat x1, const GLfloat y1, const GLfloat x2, const GLfloat y2, const GLfloat tx1, const GLfloat ty1, const GLfloat tx2, const GLfloat ty2)

Protected Member Functions
void	SetupTexture (IFontImage *texture)

Protected Attributes
GlsColor	_currentColor

const GlsFontBase *	_font

unsigned char	_textureMinFilter

unsigned char	_textureMagFilter

Detailed Description

The GlsFontRenderer object can be used to render characters from a GlsFontBase in Open GL at specific locations and with several different text effects. Prior to rendering any characters, InitRendering must be invoked to set up the proper drawing environment. Then call Render for each character to be drawn.

See also: GlsFontBase

Constructor & Destructor Documentation

GlsFontRenderer ( const GlsFontBase * font )

inline

Create a GlsFontRenderer with the default settings.

Parameters

font	The font to use for rendering. This may be NULL on creation, but it must be set before rendering.

Member Function Documentation

void DrawCharacter	(	const bool	emphasize,
		const float	emphasisOffset,
		const bool	inverse,
		const GLfloat	x1,
		const GLfloat	y1,
		const GLfloat	x2,
		const GLfloat	y2,
		const GLfloat	tx1,
		const GLfloat	ty1,
		const GLfloat	tx2,
		const GLfloat	ty2
	)		const

inline

Draws a character.

Parameters

emphasize	true if the rendered character should be emphasized. This will essentially bold the character. If a bold font is being used, the character will appear even more bolded.
emphasisOffset	Magnitude of the emhpasis offset. A good value to try is (0.2 * character_width).
inverse	true if the rendered character should be inverse video. This makes the text see-through and it's background the text foreground color.
x1	lower left corner x coordinate of the polygon
y1	lower left corner y coordinate of the polygon
x2	upper right corner x coordinate of the polygon
y2	upper right corner y coordinate of the polygon
tx1	lower left corner x texture coordinate
ty1	lower left corner y texture coordinate
tx2	upper right corner x texture coordinate
ty2	upper right corner y texture coordinate

void DrawHalo	(	const float	haloOffset,
		const float	diagonalOffset,
		const GLfloat	x1,
		const GLfloat	y1,
		const GLfloat	x2,
		const GLfloat	y2,
		const GLfloat	tx1,
		const GLfloat	ty1,
		const GLfloat	tx2,
		const GLfloat	ty2
	)		const

inline

Draws a halo effect for the given character.

Parameters

haloOffset	Controls the size of the halo GlsTextGrid uses: (emphasize ? 0.05f : 0.03f) * (character_width) (x2 - x1)
x1	lower left corner x coordinate of the polygon
y1	lower left corner y coordinate of the polygon
x2	upper right corner x coordinate of the polygon
y2	upper right corner y coordinate of the polygon
tx1	lower left corner x texture coordinate
ty1	lower left corner y texture coordinate
tx2	upper right corner x texture coordinate
ty2	upper right corner y texture coordinate

void DrawShadow	(	const float	shadowOffset,
		const GLfloat	x1,
		const GLfloat	y1,
		const GLfloat	x2,
		const GLfloat	y2,
		const GLfloat	tx1,
		const GLfloat	ty1,
		const GLfloat	tx2,
		const GLfloat	ty2
	)		const

inline

Draws a drop shadow effect for a character.

Parameters

shadowOffset	distance to offset the shadow from the character
x1	lower left corner x coordinate of the polygon
y1	lower left corner y coordinate of the polygon
x2	upper right corner x coordinate of the polygon
y2	upper right corner y coordinate of the polygon
tx1	lower left corner x texture coordinate
ty1	lower left corner y texture coordinate
tx2	upper right corner x texture coordinate
ty2	upper right corner y texture coordinate

void InitRendering	(	unsigned char	textureMinFilter,
		unsigned char	textureMagFilter
	)

inline

Initializes the font to begin rendering characters. This will set up Open GL texture modes, bind the font's texture, set up minification and magnification filters, etc. This must be called once before invoking Render to draw characters. This version overwrites the texture minification and magnification filters before initializing.

Parameters

textureMinFilter	Minification mode for the font texture
textureMagFilter	Magnification mode for the font texture

void InitRendering ( )

inline

Initializes the font to begin rendering characters. This will set up Open GL texture modes, bind the font's texture, set up minification and magnification filters, etc. This must be called before using any of the Render methods draw characters.

static void MapTexture	(	const GLfloat	x1,
		const GLfloat	y1,
		const GLfloat	x2,
		const GLfloat	y2,
		const GLfloat	tx1,
		const GLfloat	ty1,
		const GLfloat	tx2,
		const GLfloat	ty2
	)

inlinestatic

Map a square piece of a texture onto a quad ( assumed to be called between glBegin(GL_QUADS)...glEnd() pair )

Parameters

x1	the lower left corner x of the quad
y1	the lower left corner y of the quad
x2	the upper right corner x of the quad
y2	the upper right corner of the quad
tx1	lower left corner x texture coordinate
ty1	lower left corner y texture coordinate
tx2	upper right corner x texture coordinate
ty2	upper right corner y texture coordinate

void SetFont ( const GlsFontBase * font )

inline

Set the font to use. The font pointer must be set before calling any rendering methods

void SetupTexture ( IFontImage * texture )

inlineprotected

Helper method to set up Open GL texture modes, bind the font's texture, set up minification and magnification filters, etc.

void TermRendering ( )

inline

Restores the Open GL state as it was before the call to InitRendering. This should be called after all characters have been rendered using the Render methods.

unsigned char TextureMagFilter ( )

inline

Returns the magnification filter for this font

void TextureMagFilter ( unsigned char val )

inline

Sets the magnification filter for this font

unsigned char TextureMinFilter ( )

inline

Returns the minification filter for this font

void TextureMinFilter ( unsigned char val )

inline

Sets the minification filter for this font

Member Data Documentation

GlsColor _currentColor

protected

Current drawing color is kept so we don't have to make an OpenGL call if the color is the same

const GlsFontBase* _font

protected

Pointer to the font to use for rendering

unsigned char _textureMagFilter

protected

Magnification mode for the font texture

unsigned char _textureMinFilter

protected

Minification mode for the font texture

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

gls_font_renderer.h

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation