globjects::Buffer Class Reference

Wrapper for OpenGL buffer objects. More...

#include <globjects/include/globjects/Buffer.h>

Inheritance diagram for globjects::Buffer:

Public Types
enum	BindlessImplementation { BindlessImplementation::DirectStateAccessARB, BindlessImplementation::DirectStateAccessEXT, BindlessImplementation::Legacy }
Public Types inherited from globjects::Object
enum	NameImplementation { NameImplementation::DebugKHR, NameImplementation::Legacy }

Public Member Functions
	Buffer ()
	Creates a new OpenGL buffer object. More...
virtual void	accept (ObjectVisitor &visitor) override
	Implements the visitor pattern. More...
void	bind (gl::GLenum target) const
	Binds the buffer to target. More...
void	setData (gl::GLsizeiptr size, const gl::GLvoid *data, gl::GLenum usage)
	Wraps the OpenGL function glBufferData. Creates video memory for the buffer. More...
template<typename T >
void	setData (const T &data, gl::GLenum usage)
	Convenience method to simplify passing of data in form of a POD struct. More...
template<typename T >
void	setData (const std::vector< T > &data, gl::GLenum usage)
	Convenience method to simplify passing of data in form of an std::vector. More...
template<typename T , std::size_t Count>
void	setData (const std::array< T, Count > &data, gl::GLenum usage)
	Convenience method to simplify passing of data in form of an std::array. More...
void	setSubData (gl::GLintptr offset, gl::GLsizeiptr size, const gl::GLvoid *data=nullptr)
	Wraps the OpenGL function glBufferSubData. Writes data only to a defined area of the memory. More...
template<typename T >
void	setSubData (const T &data, gl::GLintptr offset=0)
	Convenience method to simplify passing of data in form of a POD struct. More...
template<typename T >
void	setSubData (const std::vector< T > &data, gl::GLintptr offset=0)
	Convenience method to simplify passing of data in form of an std::vector. More...
template<typename T , std::size_t Count>
void	setSubData (const std::array< T, Count > &data, gl::GLintptr offset=0)
	Convenience method to simplify passing of data in form of an std::array. More...
void	setStorage (gl::GLsizeiptr size, const gl::GLvoid *data, gl::BufferStorageMask flags)
	Wraps the OpenGL function glBufferStorage. More...
template<typename T >
void	setStorage (const T &data, gl::BufferStorageMask flags)
	Convenience method to simplify passing of data in form of a POD struct. More...
template<typename T >
void	setStorage (const std::vector< T > &data, gl::BufferStorageMask flags)
	Convenience method to simplify passing of data in form of an std::vector. More...
template<typename T , std::size_t Count>
void	setStorage (const std::array< T, Count > &data, gl::BufferStorageMask flags)
	Convenience method to simplify passing of data in form of an std::array. More...
gl::GLint	getParameter (gl::GLenum pname) const
	Wraps the OpenGL function gl::glGetBufferParameter. Queries OpenGL for internal state of the buffer. More...
gl::GLint64	getParameter64 (gl::GLenum pname) const
	Wraps the OpenGL function gl::glGetBufferParameter for 64 bit data types. Queries OpenGL for internal state of the buffer. More...
const void *	map () const
	Maps the Buffer's memory read only. More...
void *	map (gl::GLenum access)
	Maps the Buffer's memory using the internal target. More...
void *	mapRange (gl::GLintptr offset, gl::GLsizeiptr length, gl::BufferAccessMask access)
	Wraps the OpenGL function glMapBufferRange. Maps only a range of the buffers memory. More...
bool	unmap () const
	Wraps the OpenGL function glUnmapBuffer. More...
void	flushMappedRange (gl::GLintptr offset, gl::GLsizeiptr length)
	Wraps the OpenGL function glFlushMappedBufferRange. More...
void	bindBase (gl::GLenum target, gl::GLuint index) const
	Wraps the OpenGL function gl::glBindBufferBase. More...
void	bindRange (gl::GLenum target, gl::GLuint index, gl::GLintptr offset, gl::GLsizeiptr size) const
	Wraps the OpenGL function gl::glBindBufferRange. More...
void	copySubData (Buffer *buffer, gl::GLintptr readOffset, gl::GLintptr writeOffset, gl::GLsizeiptr size) const
	Wraps the OpenGL function glCopyBufferSubData. More...
void	copySubData (Buffer *buffer, gl::GLsizeiptr size) const
	Convenience method. Both readOffset and writeOffset are 0. More...
void	copyData (Buffer *buffer, gl::GLsizeiptr size, gl::GLenum usage) const
	Creates new uninitialized memory to fit size (using usage), then copies the contents of buffer to this buffer's new memory. More...
void	clearData (gl::GLenum internalformat, gl::GLenum format, gl::GLenum type, const void *data=nullptr)
	Wraps the OpenGL function gl::glClearBufferData. Clears the Buffer's data by filling it with the value in data, which has to be long enough to match format. More...
void	clearSubData (gl::GLenum internalformat, gl::GLintptr offset, gl::GLsizeiptr size, gl::GLenum format, gl::GLenum type, const void *data=nullptr)
	Wraps the OpenGL function gl::glClearBufferSubData. More...
const void *	getPointer () const
void *	getPointer ()
const void *	getPointer (gl::GLenum pname) const
void *	getPointer (gl::GLenum pname)
void	getSubData (gl::GLintptr offset, gl::GLsizeiptr size, void *data) const
	Wraps the OpenGL function glGetBufferSubData. Retrieves the contents of the buffers data store. More...
template<typename T >
std::vector< T >	getSubData (gl::GLsizeiptr count, gl::GLintptr offset=0) const
	Convenience method to simplify getting of data in form of an std::vector. More...
template<typename T , std::size_t Count>
std::array< T, Count >	getSubData (gl::GLintptr offset=0) const
	Convenience method to simplify getting of data in form of an std::array. More...
void	invalidateData () const
	Wraps the OpenGL function gl::glInvalidateBufferData. More...
void	invalidateSubData (gl::GLintptr offset, gl::GLsizeiptr length) const
	Wraps the OpenGL function gl::glInvalidateBufferSubData. More...
virtual gl::GLenum	objectType () const override
Public Member Functions inherited from globjects::Object
gl::GLuint	id () const
std::string	name () const
void	setName (const std::string &name)
bool	hasName () const
bool	isDefault () const
void	detach ()
Public Member Functions inherited from globjects::Referenced
	Referenced ()
void	ref () const
void	unref () const
int	refCounter () const
Public Member Functions inherited from globjects::HeapOnly
	HeapOnly ()
void	destroy () const

Static Public Member Functions
static void	hintBindlessImplementation (BindlessImplementation impl)
static void	setWorkingTarget (gl::GLenum target)
	Sets the target that is used for binding buffers to call state changing OpenGL functions. This has an effect only when GL_EXT_direct_state_access is not available. Usually this target never has to be changed unless you want to ensure that a certain binding target will not be used. More...
static Buffer *	fromId (gl::GLuint id)
	Creates a buffer with an external id. This object does not own the associated OpenGL object and will not delete it in the destructor. More...
static void	unbind (gl::GLenum target)
	Unbinds a specific target, i.e. binds a 0 id to the target. More...
static void	unbind (gl::GLenum target, gl::GLuint index)
	Unbinds the buffer bound to the target and index. More...
Static Public Member Functions inherited from globjects::Object
static void	hintNameImplementation (NameImplementation impl)

Protected Member Functions
	Buffer (IDResource *resource)
	Creates a buffer with an external id. More...
virtual	~Buffer ()
Protected Member Functions inherited from globjects::Object
	Object (IDResource *resource)
virtual	~Object ()
Protected Member Functions inherited from globjects::Referenced
virtual	~Referenced ()
Protected Member Functions inherited from globjects::HeapOnly
virtual	~HeapOnly ()

Additional Inherited Members
Protected Attributes inherited from globjects::Object
IDResource *	m_resource
void *	m_objectLabelState

Detailed Description

Wrapper for OpenGL buffer objects.

The Buffer class encapsulates OpenGL buffer objects. Each buffer can be bound and unbound (bind(), unbind()). To fill the buffer use setData(). To access the data of a buffer directly, you can use map(). Buffers can be used for OpenGL draw calls, which are encapsulated within drawArrays() and drawElements() on VertexArrayObject, but that doesn't guarantee that OpenGL will use this buffer for drawing. The current bound VertexArrayObject and Program will specify the render pipeline and data.

Buffer * buffer = new Buffer(gl::GL_SHADER_STORAGE_BUFFER);
buffer->setData(sizeof(glm::vec4) * 100, nullptr, gl::GL_DYNAMIC_DRAW); // allocate 100 vec4

See also

http://www.opengl.org/wiki/Buffer_Object

Member Enumeration Documentation

enum globjects::Buffer::BindlessImplementation

strong

Enumerator
DirectStateAccessARB
DirectStateAccessEXT
Legacy

Constructor & Destructor Documentation

globjects::Buffer::Buffer

(

)

Creates a new OpenGL buffer object.

globjects::Buffer::Buffer ( IDResource *  resource )

protected

Creates a buffer with an external id.

Parameters

id	an external OpenGL buffer id

virtual globjects::Buffer::~Buffer ( )

protectedvirtual

Automatically deletes the associated OpenGL buffer unless the object was created with an external id.

See also

https://www.opengl.org/sdk/docs/man4/xhtml/gl::glDeleteBuffers.xml

Member Function Documentation

static void globjects::Buffer::hintBindlessImplementation ( BindlessImplementation  impl )

static

static void globjects::Buffer::setWorkingTarget ( gl::GLenum  target )

static

Sets the target that is used for binding buffers to call state changing OpenGL functions. This has an effect only when GL_EXT_direct_state_access is not available. Usually this target never has to be changed unless you want to ensure that a certain binding target will not be used.

Parameters

target

static Buffer* globjects::Buffer::fromId ( gl::GLuint  id )

static

Creates a buffer with an external id. This object does not own the associated OpenGL object and will not delete it in the destructor.

Parameters

id	an external OpenGL buffer id

virtual void globjects::Buffer::accept ( ObjectVisitor &  visitor )

overridevirtual

Implements the visitor pattern.

Parameters

visitor

The visitor on which visitBuffer will be called.

Implements globjects::Object.

void globjects::Buffer::bind

(

gl::GLenum

target

)

const

Binds the buffer to target.

Parameters

target

the target for binding

See also

https://www.opengl.org/sdk/docs/man4/xhtml/gl::glBindBuffer.xml

static void globjects::Buffer::unbind ( gl::GLenum  target )

static

Unbinds a specific target, i.e. binds a 0 id to the target.

Parameters

target

the target for unbinding

static void globjects::Buffer::unbind ( gl::GLenum  target, gl::GLuint  index  )

static

Unbinds the buffer bound to the target and index.

Parameters

target	the target for unbinding
index	the index for unbinding

void globjects::Buffer::setData	(	gl::GLsizeiptr	size,
		const gl::GLvoid *	data,
		gl::GLenum	usage
	)

Wraps the OpenGL function glBufferData. Creates video memory for the buffer.

Parameters

size	size of the new memory in bytes
data	memory location containing the data. If data is nullptr, uninitalized memory will be created.
usage	used as a performance hint on how the buffer is used

See also

https://www.opengl.org/sdk/docs/man4/xhtml/glBufferData.xml

template<typename T >

void globjects::Buffer::setData	(	const T &	data,
		gl::GLenum	usage
	)

Convenience method to simplify passing of data in form of a POD struct.

template<typename T >

void globjects::Buffer::setData	(	const std::vector< T > &	data,
		gl::GLenum	usage
	)

Convenience method to simplify passing of data in form of an std::vector.

template<typename T , std::size_t Count>

void globjects::Buffer::setData	(	const std::array< T, Count > &	data,
		gl::GLenum	usage
	)

Convenience method to simplify passing of data in form of an std::array.

void globjects::Buffer::setSubData	(	gl::GLintptr	offset,
		gl::GLsizeiptr	size,
		const gl::GLvoid *	data = nullptr
	)

Wraps the OpenGL function glBufferSubData. Writes data only to a defined area of the memory.

Parameters

size	size of memory in bytes
offset	offset from the beginning of the buffer in bytes
data	memory location containing the data

See also

http://www.opengl.org/sdk/docs/man/xhtml/glBufferSubData.xml

template<typename T >

void globjects::Buffer::setSubData	(	const T &	data,
		gl::GLintptr	offset = 0
	)

Convenience method to simplify passing of data in form of a POD struct.

template<typename T >

void globjects::Buffer::setSubData	(	const std::vector< T > &	data,
		gl::GLintptr	offset = 0
	)

Convenience method to simplify passing of data in form of an std::vector.

template<typename T , std::size_t Count>

void globjects::Buffer::setSubData	(	const std::array< T, Count > &	data,
		gl::GLintptr	offset = 0
	)

Convenience method to simplify passing of data in form of an std::array.

void globjects::Buffer::setStorage	(	gl::GLsizeiptr	size,
		const gl::GLvoid *	data,
		gl::BufferStorageMask	flags
	)

Wraps the OpenGL function glBufferStorage.

Parameters

size	size of the new memory in bytes
data	data memory location containing the data.
flags	flags indicating usage

See also

www.opengl.org/sdk/docs/man/xhtml/glBufferStorage.xml

template<typename T >

void globjects::Buffer::setStorage	(	const T &	data,
		gl::BufferStorageMask	flags
	)

Convenience method to simplify passing of data in form of a POD struct.

template<typename T >

void globjects::Buffer::setStorage	(	const std::vector< T > &	data,
		gl::BufferStorageMask	flags
	)

Convenience method to simplify passing of data in form of an std::vector.

template<typename T , std::size_t Count>

void globjects::Buffer::setStorage	(	const std::array< T, Count > &	data,
		gl::BufferStorageMask	flags
	)

Convenience method to simplify passing of data in form of an std::array.

gl::GLint globjects::Buffer::getParameter

(

gl::GLenum

pname

)

const

Wraps the OpenGL function gl::glGetBufferParameter. Queries OpenGL for internal state of the buffer.

Parameters

pname

name of the parameter, e.g. gl::GL_BUFFER_SIZE

Returns

integer value for the parameter

See also

http://www.opengl.org/sdk/docs/man/xhtml/gl::glGetBufferParameter.xml

gl::GLint64 globjects::Buffer::getParameter64

(

gl::GLenum

pname

)

const

Wraps the OpenGL function gl::glGetBufferParameter for 64 bit data types. Queries OpenGL for internal state of the buffer.

Parameters

pname

name of the parameter, e.g. gl::GL_BUFFER_SIZE

Returns

integer value for the parameter

See also

http://www.opengl.org/sdk/docs/man/xhtml/gl::glGetBufferParameter.xml

const void* globjects::Buffer::map

(

)

const

Maps the Buffer's memory read only.

Returns

a pointer to the mapped memory

void* globjects::Buffer::map

(

gl::GLenum

access

)

Maps the Buffer's memory using the internal target.

Parameters

access

specifies reading/writing access

Returns

a pointer to the mapped memory

void* globjects::Buffer::mapRange	(	gl::GLintptr	offset,
		gl::GLsizeiptr	length,
		gl::BufferAccessMask	access
	)

Wraps the OpenGL function glMapBufferRange. Maps only a range of the buffers memory.

Parameters

offset	offset from the beginning of the buffer data in bytes.
length	length of the range in bytes.
access	bitfield of desired access flags

Returns

pointer to the mapped memory

See also

http://www.opengl.org/sdk/docs/man/xhtml/glMapBufferRange.xml

bool globjects::Buffer::unmap

(

)

const

Wraps the OpenGL function glUnmapBuffer.

See also

http://www.opengl.org/sdk/docs/man3/xhtml/glMapBuffer.xml

void globjects::Buffer::flushMappedRange	(	gl::GLintptr	offset,
		gl::GLsizeiptr	length
	)

Wraps the OpenGL function glFlushMappedBufferRange.

Parameters

offset	offset from the beginning of the buffer data in bytes.
length	length of the range in bytes

See also

http://www.opengl.org/sdk/docs/man/html/glFlushMappedBufferRange.xhtml

void globjects::Buffer::bindBase	(	gl::GLenum	target,
		gl::GLuint	index
	)		const

Wraps the OpenGL function gl::glBindBufferBase.

See also

http://www.opengl.org/sdk/docs/man/xhtml/gl::glBindBufferBase.xml

void globjects::Buffer::bindRange	(	gl::GLenum	target,
		gl::GLuint	index,
		gl::GLintptr	offset,
		gl::GLsizeiptr	size
	)		const

Wraps the OpenGL function gl::glBindBufferRange.

See also

http://www.opengl.org/sdk/docs/man3/xhtml/gl::glBindBufferRange.xml

void globjects::Buffer::copySubData	(	Buffer *	buffer,
		gl::GLintptr	readOffset,
		gl::GLintptr	writeOffset,
		gl::GLsizeiptr	size
	)		const

Wraps the OpenGL function glCopyBufferSubData.

Parameters

readOffset	offset in bytes in read buffer
writeOffset	offset in bytes in write buffer
size	size of the data to be copies in bytes

See also

http://www.opengl.org/sdk/docs/man3/xhtml/glCopyBufferSubData.xml

void globjects::Buffer::copySubData	(	Buffer *	buffer,
		gl::GLsizeiptr	size
	)		const

Convenience method. Both readOffset and writeOffset are 0.

void globjects::Buffer::copyData	(	Buffer *	buffer,
		gl::GLsizeiptr	size,
		gl::GLenum	usage
	)		const

Creates new uninitialized memory to fit size (using usage), then copies the contents of buffer to this buffer's new memory.

Parameters

buffer	buffer from which content is copied
size	size of the data to be copied
usage	buffer usage

void globjects::Buffer::clearData	(	gl::GLenum	internalformat,
		gl::GLenum	format,
		gl::GLenum	type,
		const void *	data = nullptr
	)

Wraps the OpenGL function gl::glClearBufferData. Clears the Buffer's data by filling it with the value in data, which has to be long enough to match format.

Parameters

data	up to 4 components of the vector value to fill the buffer with

See also

http://www.opengl.org/sdk/docs/man/xhtml/gl::glClearBufferData.xml

void globjects::Buffer::clearSubData	(	gl::GLenum	internalformat,
		gl::GLintptr	offset,
		gl::GLsizeiptr	size,
		gl::GLenum	format,
		gl::GLenum	type,
		const void *	data = nullptr
	)

Wraps the OpenGL function gl::glClearBufferSubData.

Parameters

offset	offset in bytes
size	size in bytes

See also

https://www.opengl.org/sdk/docs/man4/xhtml/gl::glClearBufferSubData.xml

const void* globjects::Buffer::getPointer

(

)

const

void* globjects::Buffer::getPointer

(

)

const void* globjects::Buffer::getPointer

(

gl::GLenum

pname

)

const

void* globjects::Buffer::getPointer

(

gl::GLenum

pname

)

void globjects::Buffer::getSubData	(	gl::GLintptr	offset,
		gl::GLsizeiptr	size,
		void *	data
	)		const

Wraps the OpenGL function glGetBufferSubData. Retrieves the contents of the buffers data store.

Parameters

offset	offset from the beginning of the buffer in bytes
size	size of memory in bytes
data	memory location to store the data

See also

http://www.opengl.org/sdk/docs/man/xhtml/glGetBufferSubData.xml

template<typename T >

std::vector<T> globjects::Buffer::getSubData	(	gl::GLsizeiptr	count,
		gl::GLintptr	offset = 0
	)		const

Convenience method to simplify getting of data in form of an std::vector.

template<typename T , std::size_t Count>

std::array<T, Count> globjects::Buffer::getSubData

(

gl::GLintptr

offset = 0

)

const

Convenience method to simplify getting of data in form of an std::array.

void globjects::Buffer::invalidateData

(

)

const

Wraps the OpenGL function gl::glInvalidateBufferData.

See also

https://www.opengl.org/sdk/docs/man/html/glInvalidateBufferData.xhtml

void globjects::Buffer::invalidateSubData	(	gl::GLintptr	offset,
		gl::GLsizeiptr	length
	)		const

Wraps the OpenGL function gl::glInvalidateBufferSubData.

Parameters

offset	offset in bytes
size	size in bytes

See also

https://www.opengl.org/sdk/docs/man/html/glInvalidateBufferSubData.xhtml

virtual gl::GLenum globjects::Buffer::objectType ( ) const

overridevirtual

Implements globjects::Object.

---

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

• Buffer.h