OpenGL interoperability

This section describes OpenGL interoperability. More...

Collaboration diagram for OpenGL interoperability:

Modules
	CUDA-accelerated Computer Vision

Namespaces
	cv::cuda
	cv::ogl::ocl

Classes
class	cv::ogl::Arrays
	Wrapper for OpenGL Client-Side Vertex arrays. More...
class	cv::ogl::Buffer
	Smart pointer for OpenGL buffer object with reference counting. More...
class	cv::ogl::Texture2D
	Smart pointer for OpenGL 2D texture memory with reference counting. More...

Enumerations
enum	cv::ogl::Buffer::Access {   cv::ogl::Buffer::READ_ONLY = 0x88B8,   cv::ogl::Buffer::WRITE_ONLY = 0x88B9,   cv::ogl::Buffer::READ_WRITE = 0x88BA }
enum	cv::ogl::Texture2D::Format {   cv::ogl::Texture2D::NONE = 0,   cv::ogl::Texture2D::DEPTH_COMPONENT = 0x1902,   cv::ogl::Texture2D::RGB = 0x1907,   cv::ogl::Texture2D::RGBA = 0x1908 }
	An Image Format describes the way that the images in Textures store their data. More...
enum	cv::ogl::RenderModes {   cv::ogl::POINTS = 0x0000,   cv::ogl::LINES = 0x0001,   cv::ogl::LINE_LOOP = 0x0002,   cv::ogl::LINE_STRIP = 0x0003,   cv::ogl::TRIANGLES = 0x0004,   cv::ogl::TRIANGLE_STRIP = 0x0005,   cv::ogl::TRIANGLE_FAN = 0x0006,   cv::ogl::QUADS = 0x0007,   cv::ogl::QUAD_STRIP = 0x0008,   cv::ogl::POLYGON = 0x0009 }
	render mode More...
enum	cv::ogl::Buffer::Target {   cv::ogl::Buffer::ARRAY_BUFFER = 0x8892,   cv::ogl::Buffer::ELEMENT_ARRAY_BUFFER = 0x8893,   cv::ogl::Buffer::PIXEL_PACK_BUFFER = 0x88EB,   cv::ogl::Buffer::PIXEL_UNPACK_BUFFER = 0x88EC }
	The target defines how you intend to use the buffer object. More...

Functions
	cv::ogl::Arrays::Arrays ()
	Default constructor. More...
	cv::ogl::Buffer::Buffer ()
	The constructors. More...
	cv::ogl::Buffer::Buffer (int arows, int acols, int atype, unsigned int abufId, bool autoRelease=false)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
	cv::ogl::Buffer::Buffer (Size asize, int atype, unsigned int abufId, bool autoRelease=false)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
	cv::ogl::Buffer::Buffer (int arows, int acols, int atype, Target target=ARRAY_BUFFER, bool autoRelease=false)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
	cv::ogl::Buffer::Buffer (Size asize, int atype, Target target=ARRAY_BUFFER, bool autoRelease=false)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
	cv::ogl::Buffer::Buffer (InputArray arr, Target target=ARRAY_BUFFER, bool autoRelease=false)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
	cv::ogl::Texture2D::Texture2D ()
	The constructors. More...
	cv::ogl::Texture2D::Texture2D (int arows, int acols, Format aformat, unsigned int atexId, bool autoRelease=false)
	cv::ogl::Texture2D::Texture2D (Size asize, Format aformat, unsigned int atexId, bool autoRelease=false)
	cv::ogl::Texture2D::Texture2D (int arows, int acols, Format aformat, bool autoRelease=false)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
	cv::ogl::Texture2D::Texture2D (Size asize, Format aformat, bool autoRelease=false)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
	cv::ogl::Texture2D::Texture2D (InputArray arr, bool autoRelease=false)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
void	cv::ogl::Buffer::bind (Target target) const
	Binds OpenGL buffer to the specified buffer binding point. More...
void	cv::ogl::Texture2D::bind () const
	Binds texture to current active texture unit for GL_TEXTURE_2D target. More...
void	cv::ogl::Arrays::bind () const
	Binds all vertex arrays. More...
unsigned int	cv::ogl::Buffer::bufId () const
	get OpenGL opject id More...
int	cv::ogl::Buffer::channels () const
Buffer	cv::ogl::Buffer::clone (Target target=ARRAY_BUFFER, bool autoRelease=false) const
	Creates a full copy of the buffer object and the underlying data. More...
int	cv::ogl::Buffer::cols () const
int	cv::ogl::Texture2D::cols () const
void	cv::ogl::convertFromGLTexture2D (const Texture2D &texture, OutputArray dst)
	Converts Texture2D object to OutputArray. More...
void	cv::ogl::convertToGLTexture2D (InputArray src, Texture2D &texture)
	Converts InputArray to Texture2D object. More...
void	cv::ogl::Buffer::copyFrom (InputArray arr, Target target=ARRAY_BUFFER, bool autoRelease=false)
	Copies from host/device memory to OpenGL buffer. More...
void	cv::ogl::Buffer::copyFrom (InputArray arr, cuda::Stream &stream, Target target=ARRAY_BUFFER, bool autoRelease=false)
void	cv::ogl::Texture2D::copyFrom (InputArray arr, bool autoRelease=false)
	Copies from host/device memory to OpenGL texture. More...
void	cv::ogl::Buffer::copyTo (OutputArray arr) const
	Copies from OpenGL buffer to host/device memory or another OpenGL buffer object. More...
void	cv::ogl::Buffer::copyTo (OutputArray arr, cuda::Stream &stream) const
void	cv::ogl::Texture2D::copyTo (OutputArray arr, int ddepth=CV_32F, bool autoRelease=false) const
	Copies from OpenGL texture to host/device memory or another OpenGL texture object. More...
void	cv::ogl::Buffer::create (int arows, int acols, int atype, Target target=ARRAY_BUFFER, bool autoRelease=false)
	Allocates memory for ogl::Buffer object. More...
void	cv::ogl::Buffer::create (Size asize, int atype, Target target=ARRAY_BUFFER, bool autoRelease=false)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
void	cv::ogl::Texture2D::create (int arows, int acols, Format aformat, bool autoRelease=false)
	Allocates memory for ogl::Texture2D object. More...
void	cv::ogl::Texture2D::create (Size asize, Format aformat, bool autoRelease=false)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
int	cv::ogl::Buffer::depth () const
int	cv::ogl::Buffer::elemSize () const
int	cv::ogl::Buffer::elemSize1 () const
bool	cv::ogl::Buffer::empty () const
bool	cv::ogl::Texture2D::empty () const
bool	cv::ogl::Arrays::empty () const
Format	cv::ogl::Texture2D::format () const
Context &	cv::ogl::ocl::initializeContextFromGL ()
	Creates OpenCL context from GL. More...
cuda::GpuMat	cv::ogl::Buffer::mapDevice ()
	map to device memory (blocking) More...
cuda::GpuMat	cv::ogl::Buffer::mapDevice (cuda::Stream &stream)
	Maps OpenGL buffer to CUDA device memory. More...
UMat	cv::ogl::mapGLBuffer (const Buffer &buffer, int accessFlags=ACCESS_READ|ACCESS_WRITE)
	Maps Buffer object to process on CL side (convert to UMat). More...
Mat	cv::ogl::Buffer::mapHost (Access access)
	Maps OpenGL buffer to host memory. More...
void	cv::ogl::Buffer::release ()
	Decrements the reference counter and destroys the buffer object if needed. More...
void	cv::ogl::Texture2D::release ()
	Decrements the reference counter and destroys the texture object if needed. More...
void	cv::ogl::Arrays::release ()
	Releases all inner buffers. More...
void	cv::ogl::render (const Texture2D &tex, Rect_< double > wndRect=Rect_< double >(0.0, 0.0, 1.0, 1.0), Rect_< double > texRect=Rect_< double >(0.0, 0.0, 1.0, 1.0))
	Render OpenGL texture or primitives. More...
void	cv::ogl::render (const Arrays &arr, int mode=POINTS, Scalar color=Scalar::all(255))
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
void	cv::ogl::render (const Arrays &arr, InputArray indices, int mode=POINTS, Scalar color=Scalar::all(255))
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
void	cv::ogl::Arrays::resetColorArray ()
	Resets vertex colors. More...
void	cv::ogl::Arrays::resetNormalArray ()
	Resets vertex normals. More...
void	cv::ogl::Arrays::resetTexCoordArray ()
	Resets vertex texture coordinates. More...
void	cv::ogl::Arrays::resetVertexArray ()
	Resets vertex coordinates. More...
int	cv::ogl::Buffer::rows () const
int	cv::ogl::Texture2D::rows () const
void	cv::ogl::Buffer::setAutoRelease (bool flag)
	Sets auto release mode. More...
void	cv::ogl::Texture2D::setAutoRelease (bool flag)
	Sets auto release mode. More...
void	cv::ogl::Arrays::setAutoRelease (bool flag)
	Sets auto release mode all inner buffers. More...
void	cv::ogl::Arrays::setColorArray (InputArray color)
	Sets an array of vertex colors. More...
void	cv::cuda::setGlDevice (int device=0)
	Sets a CUDA device and initializes it for the current thread with OpenGL interoperability. More...
void	cv::ogl::Arrays::setNormalArray (InputArray normal)
	Sets an array of vertex normals. More...
void	cv::ogl::Arrays::setTexCoordArray (InputArray texCoord)
	Sets an array of vertex texture coordinates. More...
void	cv::ogl::Arrays::setVertexArray (InputArray vertex)
	Sets an array of vertex coordinates. More...
Size	cv::ogl::Buffer::size () const
Size	cv::ogl::Texture2D::size () const
int	cv::ogl::Arrays::size () const
	Returns the vertex count. More...
unsigned int	cv::ogl::Texture2D::texId () const
	get OpenGL opject id More...
int	cv::ogl::Buffer::type () const
static void	cv::ogl::Buffer::unbind (Target target)
	Unbind any buffers from the specified binding point. More...
void	cv::ogl::Buffer::unmapDevice ()
void	cv::ogl::Buffer::unmapDevice (cuda::Stream &stream)
	Unmaps OpenGL buffer. More...
void	cv::ogl::unmapGLBuffer (UMat &u)
	Unmaps Buffer object (releases UMat, previously mapped from Buffer). More...
void	cv::ogl::Buffer::unmapHost ()
	Unmaps OpenGL buffer. More...

Detailed Description

This section describes OpenGL interoperability.

To enable OpenGL support, configure OpenCV using CMake with WITH_OPENGL=ON . Currently OpenGL is supported only with WIN32, GTK and Qt backends on Windows and Linux (MacOS and Android are not supported). For GTK backend gtkglext-1.0 library is required.

To use OpenGL functionality you should first create OpenGL context (window or frame buffer). You can do this with namedWindow function or with other OpenGL toolkit (GLUT, for example).

Enumeration Type Documentation

enum cv::ogl::Buffer::Access

Enumerator
READ_ONLY
WRITE_ONLY
READ_WRITE

enum cv::ogl::Texture2D::Format

An Image Format describes the way that the images in Textures store their data.

Enumerator
NONE
DEPTH_COMPONENT	Depth.
RGB	Red, Green, Blue.
RGBA	Red, Green, Blue, Alpha.

enum cv::ogl::RenderModes

#include <core/include/opencv2/core/opengl.hpp>

render mode

Enumerator
POINTS
LINES
LINE_LOOP
LINE_STRIP
TRIANGLES
TRIANGLE_STRIP
TRIANGLE_FAN
QUADS
QUAD_STRIP
POLYGON

enum cv::ogl::Buffer::Target

The target defines how you intend to use the buffer object.

Enumerator
ARRAY_BUFFER	The buffer will be used as a source for vertex data.
ELEMENT_ARRAY_BUFFER	The buffer will be used for indices (in glDrawElements, for example)
PIXEL_PACK_BUFFER	The buffer will be used for reading from OpenGL textures.
PIXEL_UNPACK_BUFFER	The buffer will be used for writing to OpenGL textures.

Function Documentation

cv::ogl::Arrays::Arrays

(

)

#include <core/include/opencv2/core/opengl.hpp>

Default constructor.

cv::ogl::Buffer::Buffer

(

)

#include <core/include/opencv2/core/opengl.hpp>

The constructors.

Creates empty ogl::Buffer object, creates ogl::Buffer object from existed buffer ( abufId parameter), allocates memory for ogl::Buffer object or copies from host/device memory.

cv::ogl::Buffer::Buffer	(	int	arows,
		int	acols,
		int	atype,
		unsigned int	abufId,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

arows	Number of rows in a 2D array.
acols	Number of columns in a 2D array.
atype	Array type ( CV_8UC1, ..., CV_64FC4 ). See Mat for details.
abufId	Buffer object name.
autoRelease	Auto release mode (if true, release will be called in object's destructor).

cv::ogl::Buffer::Buffer	(	Size	asize,
		int	atype,
		unsigned int	abufId,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

asize	2D array size.
atype	Array type ( CV_8UC1, ..., CV_64FC4 ). See Mat for details.
abufId	Buffer object name.
autoRelease	Auto release mode (if true, release will be called in object's destructor).

cv::ogl::Buffer::Buffer	(	int	arows,
		int	acols,
		int	atype,
		Target	target = ARRAY_BUFFER,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

arows	Number of rows in a 2D array.
acols	Number of columns in a 2D array.
atype	Array type ( CV_8UC1, ..., CV_64FC4 ). See Mat for details.
target	Buffer usage. See cv::ogl::Buffer::Target .
autoRelease	Auto release mode (if true, release will be called in object's destructor).

cv::ogl::Buffer::Buffer	(	Size	asize,
		int	atype,
		Target	target = ARRAY_BUFFER,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

asize	2D array size.
atype	Array type ( CV_8UC1, ..., CV_64FC4 ). See Mat for details.
target	Buffer usage. See cv::ogl::Buffer::Target .
autoRelease	Auto release mode (if true, release will be called in object's destructor).

cv::ogl::Buffer::Buffer ( InputArray  arr, Target  target = ARRAY_BUFFER, bool  autoRelease = false  )

explicit

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

arr	Input array (host or device memory, it can be Mat , cuda::GpuMat or std::vector ).
target	Buffer usage. See cv::ogl::Buffer::Target .
autoRelease	Auto release mode (if true, release will be called in object's destructor).

cv::ogl::Texture2D::Texture2D

(

)

#include <core/include/opencv2/core/opengl.hpp>

The constructors.

Creates empty ogl::Texture2D object, allocates memory for ogl::Texture2D object or copies from host/device memory.

cv::ogl::Texture2D::Texture2D	(	int	arows,
		int	acols,
		Format	aformat,
		unsigned int	atexId,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

cv::ogl::Texture2D::Texture2D	(	Size	asize,
		Format	aformat,
		unsigned int	atexId,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

cv::ogl::Texture2D::Texture2D	(	int	arows,
		int	acols,
		Format	aformat,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

arows	Number of rows.
acols	Number of columns.
aformat	Image format. See cv::ogl::Texture2D::Format .
autoRelease	Auto release mode (if true, release will be called in object's destructor).

cv::ogl::Texture2D::Texture2D	(	Size	asize,
		Format	aformat,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

asize	2D array size.
aformat	Image format. See cv::ogl::Texture2D::Format .
autoRelease	Auto release mode (if true, release will be called in object's destructor).

cv::ogl::Texture2D::Texture2D ( InputArray  arr, bool  autoRelease = false  )

explicit

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

arr	Input array (host or device memory, it can be Mat , cuda::GpuMat or ogl::Buffer ).
autoRelease	Auto release mode (if true, release will be called in object's destructor).

void cv::ogl::Buffer::bind

(

Target

target

)

const

#include <core/include/opencv2/core/opengl.hpp>

Binds OpenGL buffer to the specified buffer binding point.

Parameters

target

Binding point. See cv::ogl::Buffer::Target .

void cv::ogl::Texture2D::bind

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

Binds texture to current active texture unit for GL_TEXTURE_2D target.

void cv::ogl::Arrays::bind

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

Binds all vertex arrays.

unsigned int cv::ogl::Buffer::bufId

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

get OpenGL opject id

int cv::ogl::Buffer::channels

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

Buffer cv::ogl::Buffer::clone	(	Target	target = ARRAY_BUFFER,
		bool	autoRelease = false
	)		const

#include <core/include/opencv2/core/opengl.hpp>

Creates a full copy of the buffer object and the underlying data.

Parameters

target	Buffer usage for destination buffer.
autoRelease	Auto release mode for destination buffer.

int cv::ogl::Buffer::cols

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

int cv::ogl::Texture2D::cols

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

void cv::ogl::convertFromGLTexture2D	(	const Texture2D &	texture,
		OutputArray	dst
	)

#include <core/include/opencv2/core/opengl.hpp>

Converts Texture2D object to OutputArray.

Parameters

texture	- source Texture2D object.
dst	- destination OutputArray.

void cv::ogl::convertToGLTexture2D	(	InputArray	src,
		Texture2D &	texture
	)

#include <core/include/opencv2/core/opengl.hpp>

Converts InputArray to Texture2D object.

Parameters

src	- source InputArray.
texture	- destination Texture2D object.

void cv::ogl::Buffer::copyFrom	(	InputArray	arr,
		Target	target = ARRAY_BUFFER,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

Copies from host/device memory to OpenGL buffer.

Parameters

arr	Input array (host or device memory, it can be Mat , cuda::GpuMat or std::vector ).
target	Buffer usage. See cv::ogl::Buffer::Target .
autoRelease	Auto release mode (if true, release will be called in object's destructor).

void cv::ogl::Buffer::copyFrom	(	InputArray	arr,
		cuda::Stream &	stream,
		Target	target = ARRAY_BUFFER,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

void cv::ogl::Texture2D::copyFrom	(	InputArray	arr,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

Copies from host/device memory to OpenGL texture.

Parameters

arr	Input array (host or device memory, it can be Mat , cuda::GpuMat or ogl::Buffer ).
autoRelease	Auto release mode (if true, release will be called in object's destructor).

void cv::ogl::Buffer::copyTo

(

OutputArray

arr

)

const

#include <core/include/opencv2/core/opengl.hpp>

Copies from OpenGL buffer to host/device memory or another OpenGL buffer object.

Parameters

arr	Destination array (host or device memory, can be Mat , cuda::GpuMat , std::vector or ogl::Buffer ).

void cv::ogl::Buffer::copyTo	(	OutputArray	arr,
		cuda::Stream &	stream
	)		const

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

void cv::ogl::Texture2D::copyTo	(	OutputArray	arr,
		int	ddepth = CV_32F,
		bool	autoRelease = false
	)		const

#include <core/include/opencv2/core/opengl.hpp>

Copies from OpenGL texture to host/device memory or another OpenGL texture object.

Parameters

arr	Destination array (host or device memory, can be Mat , cuda::GpuMat , ogl::Buffer or ogl::Texture2D ).
ddepth	Destination depth.
autoRelease	Auto release mode for destination buffer (if arr is OpenGL buffer or texture).

void cv::ogl::Buffer::create	(	int	arows,
		int	acols,
		int	atype,
		Target	target = ARRAY_BUFFER,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

Allocates memory for ogl::Buffer object.

Parameters

arows	Number of rows in a 2D array.
acols	Number of columns in a 2D array.
atype	Array type ( CV_8UC1, ..., CV_64FC4 ). See Mat for details.
target	Buffer usage. See cv::ogl::Buffer::Target .
autoRelease	Auto release mode (if true, release will be called in object's destructor).

void cv::ogl::Buffer::create	(	Size	asize,
		int	atype,
		Target	target = ARRAY_BUFFER,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

asize	2D array size.
atype	Array type ( CV_8UC1, ..., CV_64FC4 ). See Mat for details.
target	Buffer usage. See cv::ogl::Buffer::Target .
autoRelease	Auto release mode (if true, release will be called in object's destructor).

void cv::ogl::Texture2D::create	(	int	arows,
		int	acols,
		Format	aformat,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

Allocates memory for ogl::Texture2D object.

Parameters

arows	Number of rows.
acols	Number of columns.
aformat	Image format. See cv::ogl::Texture2D::Format .
autoRelease	Auto release mode (if true, release will be called in object's destructor).

void cv::ogl::Texture2D::create	(	Size	asize,
		Format	aformat,
		bool	autoRelease = false
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

asize	2D array size.
aformat	Image format. See cv::ogl::Texture2D::Format .
autoRelease	Auto release mode (if true, release will be called in object's destructor).

int cv::ogl::Buffer::depth

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

int cv::ogl::Buffer::elemSize

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

int cv::ogl::Buffer::elemSize1

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

bool cv::ogl::Buffer::empty

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

bool cv::ogl::Texture2D::empty

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

bool cv::ogl::Arrays::empty

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

Format cv::ogl::Texture2D::format

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

Context& cv::ogl::ocl::initializeContextFromGL

(

)

#include <core/include/opencv2/core/opengl.hpp>

Creates OpenCL context from GL.

Returns

Returns reference to OpenCL Context

cuda::GpuMat cv::ogl::Buffer::mapDevice

(

)

#include <core/include/opencv2/core/opengl.hpp>

map to device memory (blocking)

cuda::GpuMat cv::ogl::Buffer::mapDevice

(

cuda::Stream &

stream

)

#include <core/include/opencv2/core/opengl.hpp>

Maps OpenGL buffer to CUDA device memory.

This operatation doesn't copy data. Several buffer objects can be mapped to CUDA memory at a time.

A mapped data store must be unmapped with ogl::Buffer::unmapDevice before its buffer object is used.

UMat cv::ogl::mapGLBuffer	(	const Buffer &	buffer,
		int	accessFlags = ACCESS_READ|ACCESS_WRITE
	)

#include <core/include/opencv2/core/opengl.hpp>

Maps Buffer object to process on CL side (convert to UMat).

Function creates CL buffer from GL one, and then constructs UMat that can be used to process buffer data with OpenCV functions. Note that in current implementation UMat constructed this way doesn't own corresponding GL buffer object, so it is the user responsibility to close down CL/GL buffers relationships by explicitly calling unmapGLBuffer() function.

Parameters

buffer	- source Buffer object.
accessFlags	- data access flags (ACCESS_READ|ACCESS_WRITE).

Returns

Returns UMat object

Mat cv::ogl::Buffer::mapHost

(

Access

access

)

#include <core/include/opencv2/core/opengl.hpp>

Maps OpenGL buffer to host memory.

mapHost maps to the client's address space the entire data store of the buffer object. The data can then be directly read and/or written relative to the returned pointer, depending on the specified access policy.

A mapped data store must be unmapped with ogl::Buffer::unmapHost before its buffer object is used.

This operation can lead to memory transfers between host and device.

Only one buffer object can be mapped at a time.

Parameters

access

Access policy, indicating whether it will be possible to read from, write to, or both read from and write to the buffer object's mapped data store. The symbolic constant must be ogl::Buffer::READ_ONLY , ogl::Buffer::WRITE_ONLY or ogl::Buffer::READ_WRITE .

void cv::ogl::Buffer::release

(

)

#include <core/include/opencv2/core/opengl.hpp>

Decrements the reference counter and destroys the buffer object if needed.

The function will call setAutoRelease(true) .

void cv::ogl::Texture2D::release

(

)

#include <core/include/opencv2/core/opengl.hpp>

Decrements the reference counter and destroys the texture object if needed.

The function will call setAutoRelease(true) .

void cv::ogl::Arrays::release

(

)

#include <core/include/opencv2/core/opengl.hpp>

Releases all inner buffers.

void cv::ogl::render	(	const Texture2D &	tex,
		Rect_< double >	wndRect = Rect_< double >(0.0, 0.0, 1.0, 1.0),
		Rect_< double >	texRect = Rect_< double >(0.0, 0.0, 1.0, 1.0)
	)

#include <core/include/opencv2/core/opengl.hpp>

Render OpenGL texture or primitives.

Parameters

tex	Texture to draw.
wndRect	Region of window, where to draw a texture (normalized coordinates).
texRect	Region of texture to draw (normalized coordinates).

void cv::ogl::render	(	const Arrays &	arr,
		int	mode = POINTS,
		Scalar	color = Scalar::all(255)
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

arr	Array of privitives vertices.
mode	Render mode. One of cv::ogl::RenderModes
color	Color for all vertices. Will be used if arr doesn't contain color array.

void cv::ogl::render	(	const Arrays &	arr,
		InputArray	indices,
		int	mode = POINTS,
		Scalar	color = Scalar::all(255)
	)

#include <core/include/opencv2/core/opengl.hpp>

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Parameters

arr	Array of privitives vertices.
indices	Array of vertices indices (host or device memory).
mode	Render mode. One of cv::ogl::RenderModes
color	Color for all vertices. Will be used if arr doesn't contain color array.

void cv::ogl::Arrays::resetColorArray

(

)

#include <core/include/opencv2/core/opengl.hpp>

Resets vertex colors.

void cv::ogl::Arrays::resetNormalArray

(

)

#include <core/include/opencv2/core/opengl.hpp>

Resets vertex normals.

void cv::ogl::Arrays::resetTexCoordArray

(

)

#include <core/include/opencv2/core/opengl.hpp>

Resets vertex texture coordinates.

void cv::ogl::Arrays::resetVertexArray

(

)

#include <core/include/opencv2/core/opengl.hpp>

Resets vertex coordinates.

int cv::ogl::Buffer::rows

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

int cv::ogl::Texture2D::rows

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

void cv::ogl::Buffer::setAutoRelease

(

bool

flag

)

#include <core/include/opencv2/core/opengl.hpp>

Sets auto release mode.

The lifetime of the OpenGL object is tied to the lifetime of the context. If OpenGL context was bound to a window it could be released at any time (user can close a window). If object's destructor is called after destruction of the context it will cause an error. Thus ogl::Buffer doesn't destroy OpenGL object in destructor by default (all OpenGL resources will be released with OpenGL context). This function can force ogl::Buffer destructor to destroy OpenGL object.

Parameters

flag	Auto release mode (if true, release will be called in object's destructor).

void cv::ogl::Texture2D::setAutoRelease

(

bool

flag

)

#include <core/include/opencv2/core/opengl.hpp>

Sets auto release mode.

Parameters

flag	Auto release mode (if true, release will be called in object's destructor).

The lifetime of the OpenGL object is tied to the lifetime of the context. If OpenGL context was bound to a window it could be released at any time (user can close a window). If object's destructor is called after destruction of the context it will cause an error. Thus ogl::Texture2D doesn't destroy OpenGL object in destructor by default (all OpenGL resources will be released with OpenGL context). This function can force ogl::Texture2D destructor to destroy OpenGL object.

void cv::ogl::Arrays::setAutoRelease

(

bool

flag

)

#include <core/include/opencv2/core/opengl.hpp>

Sets auto release mode all inner buffers.

Parameters

flag	Auto release mode.

void cv::ogl::Arrays::setColorArray

(

InputArray

color

)

#include <core/include/opencv2/core/opengl.hpp>

Sets an array of vertex colors.

Parameters

color

array with vertex colors, can be both host and device memory.

void cv::cuda::setGlDevice

(

int

device = 0

)

#include <core/include/opencv2/core/opengl.hpp>

Sets a CUDA device and initializes it for the current thread with OpenGL interoperability.

This function should be explicitly called after OpenGL context creation and before any CUDA calls.

Parameters

device

System index of a CUDA device starting with 0.

void cv::ogl::Arrays::setNormalArray

(

InputArray

normal

)

#include <core/include/opencv2/core/opengl.hpp>

Sets an array of vertex normals.

Parameters

normal

array with vertex normals, can be both host and device memory.

void cv::ogl::Arrays::setTexCoordArray

(

InputArray

texCoord

)

#include <core/include/opencv2/core/opengl.hpp>

Sets an array of vertex texture coordinates.

Parameters

texCoord

array with vertex texture coordinates, can be both host and device memory.

void cv::ogl::Arrays::setVertexArray

(

InputArray

vertex

)

#include <core/include/opencv2/core/opengl.hpp>

Sets an array of vertex coordinates.

Parameters

vertex

array with vertex coordinates, can be both host and device memory.

Size cv::ogl::Buffer::size

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

Size cv::ogl::Texture2D::size

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

int cv::ogl::Arrays::size

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

Returns the vertex count.

unsigned int cv::ogl::Texture2D::texId

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

get OpenGL opject id

int cv::ogl::Buffer::type

(

)

const

#include <core/include/opencv2/core/opengl.hpp>

static void cv::ogl::Buffer::unbind ( Target  target )

static

#include <core/include/opencv2/core/opengl.hpp>

Unbind any buffers from the specified binding point.

Parameters

target

Binding point. See cv::ogl::Buffer::Target .

void cv::ogl::Buffer::unmapDevice

(

)

#include <core/include/opencv2/core/opengl.hpp>

void cv::ogl::Buffer::unmapDevice

(

cuda::Stream &

stream

)

#include <core/include/opencv2/core/opengl.hpp>

Unmaps OpenGL buffer.

void cv::ogl::unmapGLBuffer

(

UMat &

u

)

#include <core/include/opencv2/core/opengl.hpp>

Unmaps Buffer object (releases UMat, previously mapped from Buffer).

Function must be called explicitly by the user for each UMat previously constructed by the call to mapGLBuffer() function.

Parameters

u	- source UMat, created by mapGLBuffer().

void cv::ogl::Buffer::unmapHost

(

)

#include <core/include/opencv2/core/opengl.hpp>

Unmaps OpenGL buffer.