GlsTriangleStrip2D Class Reference

#include <gls_triangle_storage.h>

Inheritance diagram for GlsTriangleStrip2D:

Public Member Functions
	GlsTriangleStrip2D ()
virtual	~GlsTriangleStrip2D ()
void	StartBuildingStrip ()
void	SetTexture (Image *image)
void	SetTexCoords (const float x1, const float y1, const float x2, const float y2, const float x3, const float y3)
void	AddTriangle2D (const float x1, const float y1, const float x2, const float y2, const float x3, const float y3)
void	Bake (IGlsStateManager *stateManager)
void	Draw (IGlsStateManager *stateManager, const bool enableTexture)
unsigned int	GetNumTriangles ()

Static Public Attributes
static const GLuint	VERT_SIZE = sizeof( V2f )
	Size of a vertex in bytes.
static const GLuint	TEX_SIZE = sizeof( V2f )
	Size of a texture coordinate in bytes.
static const void *const	VERT_OFFSET
static const void *const	TEX_COORD_OFFSET

Protected Member Functions
void	AllocateNextTriangle ()
void	Stripify ()

Protected Attributes
unsigned int	_numTriangles
unsigned int	_stripSize
DynamicArray< V2f_T2f, true >	_vertData
V2f	_currentTex [3]
Image *	_texture
unsigned int	_vboHandle
unsigned int	_vboBufferSize
bool	_stripified

Detailed Description

The GlsTriangleStrip2D class. Wraps an OpenGL triangle strip drawable.

Constructor & Destructor Documentation

GlsTriangleStrip2D()

GlsTriangleStrip2D

(

)

Default constructor

~GlsTriangleStrip2D()

virtual ~GlsTriangleStrip2D ( )

virtual

Destructor

Member Function Documentation

AddTriangle2D()

void AddTriangle2D	(	const float	x1,
		const float	y1,
		const float	x2,
		const float	y2,
		const float	x3,
		const float	y3
	)

Add the next triangle to the strip. Must be connected using previous two vertices of strip or be degenerate

Parameters

x1	X coord of vertex 1
y1	Y coord of vertex 1
x2	X coord of vertex 2
y2	Y coord of vertex 2
x3	X coord of vertex 3
y3	Y coord of vertex 3

Precondition

_stripified == false

Postcondition

_numTriangles++, triangle is added to strip

AllocateNextTriangle()

void AllocateNextTriangle ( )

protected

Allocate the next triangle in the set of ordered, connected triangles

Bake()

void Bake

(

IGlsStateManager *

stateManager

)

Finish building strip and bake it to a VBO

Parameters

stateManager

StateManager object to issue GL commands to

Precondition

_stripified == false

_stripified == true

Draw()

void Draw	(	IGlsStateManager *	stateManager,
		const bool	enableTexture
	)

Draw the triangle strip

Parameters

stateManager	StateManager object to issue GL commands to
enableTexture	True if strip will be drawn textured

Precondition

_stripified == true

Postcondition

The strip is drawn

GetNumTriangles()

unsigned int GetNumTriangles ( )

inline

Returns

The number of triangles in this strip.

SetTexCoords()

void SetTexCoords	(	const float	x1,
		const float	y1,
		const float	x2,
		const float	y2,
		const float	x3,
		const float	y3
	)

Set the texture coordinates to be used for the next triangle that is added (or subsequent triangles if this is not called again

Parameters

x1	X coord of vertex 1
y1	Y coord of vertex 1
x2	X coord of vertex 2
y2	Y coord of vertex 2
x3	X coord of vertex 3
y3	Y coord of vertex 3

Precondition

_texture != NULL && _stripified == false

Postcondition

_currentTex contains input values

SetTexture()

void SetTexture

(

Image *

image

)

Set the texture to be used for this triangle strip. The triangle strip may only have one texture, so it is an error to call this more than once after StartBuildingStrip() has been called.

Precondition

_texture == NULL && _stripified == false

Postcondition

_texture == img

Parameters

image

The texture to assign, or NULL if no texture

StartBuildingStrip()

void StartBuildingStrip

(

)

Sets this object into strip building mode. During strip building mode the user adds individual triangles to the strip When strip building mode is finished, the object will create a triangle strip from the individual triangles

Precondition

none

Postcondition

_stripified == false

Stripify()

void Stripify ( )

protected

Convert the set of ordered, connected triangles in this object into tristrip

Precondition

_stripified == false

_stripified == true

Member Data Documentation

_currentTex

V2f _currentTex[3]

protected

Current texture coordinates supplied for current triangle (Texture coordinates are not required to change per triangle) Used only while building list.

_numTriangles

unsigned int _numTriangles

protected

The number of triangles in the strip

_stripified

bool _stripified

protected

True if triangles have been created into a strip

_stripSize

unsigned int _stripSize

protected

The number of vertices in the strip

_texture

Image* _texture

protected

Texture to use when drawing strip. NULL if untextured

_vboBufferSize

unsigned int _vboBufferSize

protected

Size of the VBO buffer. Cached to so that when a strip is cleared and reset we will only reallocate the VBO when its size changes.

_vboHandle

unsigned int _vboHandle

protected

VBO Handle for this triangle strip

_vertData

DynamicArray<V2f_T2f, true> _vertData

protected

DynamicArray to store vertex and texture coordinates

TEX_COORD_OFFSET

const void* const TEX_COORD_OFFSET

static

Constant offsets to the primitive texture coordinate attribute.

Note

Theoretically should be GLuints, but OpenGL's functions to pass integer offsets as pointers.

VERT_OFFSET

const void* const VERT_OFFSET

static

Constant offsets to the primitive vertex attribute.

Note

Theoretically should be GLuints, but OpenGL's functions to pass integer offsets as pointers.

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

• gls_triangle_storage.h