Interface to use transform feedback. More...

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

Inheritance diagram for globjects::TransformFeedback:

Public Member Functions
	TransformFeedback ()

virtual	~TransformFeedback ()

virtual void	accept (ObjectVisitor &visitor) override

void	bind () const

void	begin (gl::GLenum primitiveMode)

void	pause ()

void	resume ()

void	end ()

void	draw (gl::GLenum primitiveMode) const

void	setVaryings (const Program program, gl::GLsizei count, const char *varyingNames, gl::GLenum bufferMode)

void	setVaryings (const Program *program, const std::vector< std::string > &varyingNames, gl::GLenum bufferMode)

template<std::size_t Count>
void	setVaryings (const Program *program, const std::array< std::string, Count > &varyingNames, gl::GLenum bufferMode)

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 ()

Static Public Member Functions
static void	unbind ()

static bool	isTransformFeedback (gl::GLuint id)

Static Public Member Functions inherited from globjects::Object
static void	hintNameImplementation (NameImplementation impl)

Static Public Member Functions inherited from globjects::Instantiator< TransformFeedback >
static std::unique_ptr< TransformFeedback >	create (Args &&...args)

static std::unique_ptr< TransformFeedback >	fromId (gl::GLuint id, Args &&...args)

Protected Member Functions
void	bind (gl::GLenum target) const

Protected Member Functions inherited from globjects::Object
	Object (std::unique_ptr< IDResource > &&resource)

virtual	~Object ()

Static Protected Member Functions
static void	unbind (gl::GLenum target)

Additional Inherited Members
Public Types inherited from globjects::Object
enum	NameImplementation { NameImplementation::DebugKHR, NameImplementation::Legacy }

Protected Attributes inherited from globjects::Object
std::unique_ptr< IDResource >	m_resource

void *	m_objectLabelState

Detailed Description

Interface to use transform feedback.

The TransformFeedback methods map directly to their OpenGL function counterparts. The draw and setVaryings method additionally binds the TransformFeedback object, whereas the begin, pause, resume and end methods doesn't.

An example usage:

std::unique_ptr<Program> program = createProgramIncludingShaders();
std::unique_ptr<TransformFeedback> transformFeedback = TransformFeedback::create();
std::unique_ptr<Buffer> buffer = Buffer::create(gl::GL_ARRAY_BUFFER);
transformFeedback->setVaryings(program, Array<const char*>{ "vertex_out" }, gl::GL_INTERLEAVED_ATTRIBS);
buffer->bindBase(gl::GL_TRANSFORM_FEEDBACK_BUFFER, 0);
buffer->setData(vertexSize, nullptr, gl::GL_DYNAMIC_DRAW);
program->use(); // use Program before issueing the begin method of TransformFeedback
transformFeedback->bind();
transformFeedback->begin(gl::GL_POINTS); // record point vertices
// draw calls
transformFeedback->end(); // stop recording vertices before releasing the Program
transformFeedback->unbind();
program->release();
// replay recorded vertices
transformFeeback->draw(gl::GL_POINTS);

See also: http://www.opengl.org/registry/specs/EXT/transform_feedback.txt; http://www.opengl.org/registry/specs/ARB/transform_feedback2.txt; http://www.opengl.org/registry/specs/ARB/transform_feedback3.txt

Constructor & Destructor Documentation

globjects::TransformFeedback::TransformFeedback ( )

virtual globjects::TransformFeedback::~TransformFeedback ( )

virtual

Member Function Documentation

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

overridevirtual

Implements globjects::Object.

void globjects::TransformFeedback::bind ( ) const

static void globjects::TransformFeedback::unbind ( )

static

void globjects::TransformFeedback::begin ( gl::GLenum primitiveMode )

void globjects::TransformFeedback::pause ( )

void globjects::TransformFeedback::resume ( )

void globjects::TransformFeedback::end ( )

void globjects::TransformFeedback::draw ( gl::GLenum primitiveMode ) const

void globjects::TransformFeedback::setVaryings	(	const Program *	program,
		gl::GLsizei	count,
		const char **	varyingNames,
		gl::GLenum	bufferMode
	)

void globjects::TransformFeedback::setVaryings	(	const Program *	program,
		const std::vector< std::string > &	varyingNames,
		gl::GLenum	bufferMode
	)

template<std::size_t Count>

void globjects::TransformFeedback::setVaryings	(	const Program *	program,
		const std::array< std::string, Count > &	varyingNames,
		gl::GLenum	bufferMode
	)