GLBuffer Class Reference

#include <GLBuffer.h>

Public Member Functions
	GLBuffer (GLenum target)
	Create a buffer object for the given OpenGL target.
	~GLBuffer ()
	Destroy and delete the GL buffer name.
void	setData (const std::vector< GLfloat > &data, size_t valuesPerElement, GLenum usage=GL_STATIC_DRAW)
	Upload interleaved float data and define element stride.
void	setData (const std::vector< GLuint > &data)
	Upload unsigned-int data (e.g., element indices).
void	setData (const float data[], size_t elemCount, size_t valuesPerElement, GLenum usage=GL_STATIC_DRAW)
	Upload interleaved float data from a raw pointer.
void	setData (const GLuint data[], size_t elemCount)
	Upload unsigned-int data from a raw pointer.
void	connectVertexAttrib (GLuint location, size_t elemCount, size_t offset=0, GLuint divisor=0) const
	Describe a vertex attribute array for the current buffer contents.
void	bind () const
	Bind the buffer to its target with glBindBuffer(target, id).

Constructor & Destructor Documentation

GLBuffer()

GLBuffer::GLBuffer

(

GLenum

target

)

Create a buffer object for the given OpenGL target.

Parameters

target

Buffer binding target (e.g., GL_ARRAY_BUFFER).

Postcondition

A GL name is generated via glGenBuffers.

~GLBuffer()

GLBuffer::~GLBuffer

(

)

Destroy and delete the GL buffer name.

Member Function Documentation

bind()

void GLBuffer::bind

(

)

const

Bind the buffer to its target with glBindBuffer(target, id).

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connectVertexAttrib()

void GLBuffer::connectVertexAttrib	(	GLuint	location,
		size_t	elemCount,
		size_t	offset = 0,
		GLuint	divisor = 0 ) const

Describe a vertex attribute array for the current buffer contents.

Parameters

location	Attribute location as retrieved from the shader.
elemCount	Number of components per attribute (e.g., 2,3,4).
offset	Offset (in elements, not bytes) from the beginning of each record.
divisor	Advanced: instance divisor for instanced rendering (0 = per-vertex).

Exceptions

GLException

If no prior setData call has established an element type.

Binds the buffer to its target, enables the attribute array, and calls glVertexAttribPointer with the stride and byte offset computed from the previously uploaded data.

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setData() [1/4]

void GLBuffer::setData	(	const float	data[],
		size_t	elemCount,
		size_t	valuesPerElement,
		GLenum	usage = GL_STATIC_DRAW )

Upload interleaved float data from a raw pointer.

Parameters

data	Pointer to elemCount*valuesPerElement floats.
elemCount	Number of logical elements.
valuesPerElement	Number of floats per element (stride in values).
usage	GL usage hint.

setData() [2/4]

void GLBuffer::setData	(	const GLuint	data[],
		size_t	elemCount )

Upload unsigned-int data from a raw pointer.

Parameters

data	Pointer to elemCount indices.
elemCount	Number of indices.

setData() [3/4]

void GLBuffer::setData	(	const std::vector< GLfloat > &	data,
		size_t	valuesPerElement,
		GLenum	usage = GL_STATIC_DRAW )

Upload interleaved float data and define element stride.

Parameters

data	Flat vector of floats.
valuesPerElement	Number of float values that make up one logical element (stride in values).
usage	GL usage hint (e.g., GL_STATIC_DRAW).

Postcondition

Internal bookkeeping (elemSize/stride/type) is updated for later attribute binding.

setData() [4/4]

void GLBuffer::setData

(

const std::vector< GLuint > &

data

)

Upload unsigned-int data (e.g., element indices).

Parameters

data	Flat vector of GLuint values.

Postcondition

Element size/stride/type are set for index-style data (stride = 1, type = GL_UNSIGNED_INT).

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

• GLBuffer.h
• GLBuffer.cpp