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Revision 1.58 by root, Wed Apr 25 20:29:03 2012 UTC

1	=head1 NAME	1	=head1 NAME
2		2
3	OpenCL - bindings to, well, OpenCL	3	OpenCL - Open Computing Language Bindings
4		4
5	=head1 SYNOPSIS	5	=head1 SYNOPSIS
6		6
7	use OpenCL;	7	use OpenCL;
8		8
9	=head1 DESCRIPTION	9	=head1 DESCRIPTION
10		10
11	This is an early release which is not useful yet.	11	This is an early release which might be useful, but hasn't seen much testing.
12		12
		13	=head2 OpenCL FROM 10000 FEET HEIGHT
		14
		15	Here is a high level overview of OpenCL:
		16
		17	First you need to find one or more OpenCL::Platforms (kind of like
		18	vendors) - usually there is only one.
		19
		20	Each platform gives you access to a number of OpenCL::Device objects, e.g.
		21	your graphics card.
		22
		23	From a platform and some device(s), you create an OpenCL::Context, which is
		24	a very central object in OpenCL: Once you have a context you can create
		25	most other objects:
		26
		27	OpenCL::Program objects, which store source code and, after building for a
		28	specific device ("compiling and linking"), also binary programs. For each
		29	kernel function in a program you can then create an OpenCL::Kernel object
		30	which represents basically a function call with argument values.
		31
		32	OpenCL::Memory objects of various flavours: OpenCL::Buffer objects (flat
		33	memory areas, think arrays or structs) and OpenCL::Image objects (think 2d
		34	or 3d array) for bulk data and input and output for kernels.
		35
		36	OpenCL::Sampler objects, which are kind of like texture filter modes in
		37	OpenGL.
		38
		39	OpenCL::Queue objects - command queues, which allow you to submit memory
		40	reads, writes and copies, as well as kernel calls to your devices. They
		41	also offer a variety of methods to synchronise request execution, for
		42	example with barriers or OpenCL::Event objects.
		43
		44	OpenCL::Event objects are used to signal when something is complete.
		45
		46	=head2 HELPFUL RESOURCES
		47
		48	The OpenCL specs used to develop this module:
		49
		50	http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf
		51	http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf
		52	http://www.khronos.org/registry/cl/specs/opencl-1.2-extensions.pdf
		53
		54	OpenCL manpages:
		55
		56	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/
		57	http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/
		58
		59	If you are into UML class diagrams, the following diagram might help - if
		60	not, it will be mildly confusing (also, the class hierarchy of this module
		61	is much more fine-grained):
		62
		63	http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/classDiagram.html
		64
		65	Here's a tutorial from AMD (very AMD-centric, too), not sure how useful it
		66	is, but at least it's free of charge:
		67
		68	http://developer.amd.com/zones/OpenCLZone/courses/Documents/Introduction_to_OpenCL_Programming%20Training_Guide%20%28201005%29.pdf
		69
		70	And here's NVIDIA's OpenCL Best Practises Guide:
		71
		72	http://developer.download.nvidia.com/compute/cuda/3_2/toolkit/docs/OpenCL_Best_Practices_Guide.pdf
		73
		74	=head1 BASIC WORKFLOW
		75
		76	To get something done, you basically have to do this once (refer to the
		77	examples below for actual code, this is just a high-level description):
		78
		79	Find some platform (e.g. the first one) and some device(s) (e.g. the first
		80	device of the platform), and create a context from those.
		81
		82	Create program objects from your OpenCL source code, then build (compile)
		83	the programs for each device you want to run them on.
		84
		85	Create kernel objects for all kernels you want to use (surprisingly, these
		86	are not device-specific).
		87
		88	Then, to execute stuff, you repeat these steps, possibly resuing or
		89	sharing some buffers:
		90
		91	Create some input and output buffers from your context. Set these as
		92	arguments to your kernel.
		93
		94	Enqueue buffer writes to initialise your input buffers (when not
		95	initialised at creation time).
		96
		97	Enqueue the kernel execution.
		98
		99	Enqueue buffer reads for your output buffer to read results.
		100
		101	=head1 EXAMPLES
		102
13	Enumerate all devices and get contexts for them;	103	=head2 Enumerate all devices and get contexts for them.
		104
		105	Best run this once to get a feel for the platforms and devices in your
		106	system.
14		107
15	for my $platform (OpenCL::platforms) {	108	for my $platform (OpenCL::platforms) {
16	warn $platform->info (OpenCL::PLATFORM_NAME);	109	printf "platform: %s\n", $platform->name;
17	warn $platform->info (OpenCL::PLATFORM_EXTENSIONS);	110	printf "extensions: %s\n", $platform->extensions;
18	for my $device ($platform->devices) {	111	for my $device ($platform->devices) {
19	warn $device->info (OpenCL::DEVICE_NAME);	112	printf "+ device: %s\n", $device->name;
20	my $ctx = $device->context_simple;	113	my $ctx = $platform->context (undef, [$device]);
21	# do stuff	114	# do stuff
22	}	115	}
23	}	116	}
24		117
25	Get a useful context and a command queue:	118	=head2 Get a useful context and a command queue.
26		119
27	my $dev = ((OpenCL::platforms)[0]->devices)[0];	120	This is a useful boilerplate for any OpenCL program that only wants to use
28	my $ctx = $dev->context_simple;	121	one device,
		122
		123	my ($platform) = OpenCL::platforms; # find first platform
		124	my ($dev) = $platform->devices; # find first device of platform
		125	my $ctx = $platform->context (undef, [$dev]); # create context out of those
		126	my $queue = $ctx->queue ($dev); # create a command queue for the device
		127
		128	=head2 Print all supported image formats of a context.
		129
		130	Best run this once for your context, to see whats available and how to
		131	gather information.
		132
		133	for my $type (OpenCL::MEM_OBJECT_IMAGE2D, OpenCL::MEM_OBJECT_IMAGE3D) {
		134	print "supported image formats for ", OpenCL::enum2str $type, "\n";
		135
		136	for my $f ($ctx->supported_image_formats (0, $type)) {
		137	printf " %-10s %-20s\n", OpenCL::enum2str $f->[0], OpenCL::enum2str $f->[1];
		138	}
		139	}
		140
		141	=head2 Create a buffer with some predefined data, read it back synchronously,
		142	then asynchronously.
		143
		144	my $buf = $ctx->buffer_sv (OpenCL::MEM_COPY_HOST_PTR, "helmut");
		145
		146	$queue->enqueue_read_buffer ($buf, 1, 1, 3, my $data);
		147	print "$data\n";
		148
		149	my $ev = $queue->enqueue_read_buffer ($buf, 0, 1, 3, my $data);
		150	$ev->wait;
		151	print "$data\n"; # prints "elm"
		152
		153	=head2 Create and build a program, then create a kernel out of one of its
		154	functions.
		155
		156	my $src = '
		157	kernel void
		158	squareit (global float *input, global float *output)
		159	{
		160	$id = get_global_id (0);
		161	output [id] = input [id] * input [id];
		162	}
		163	';
		164
		165	my $prog = $ctx->build_program ($src);
		166	my $kernel = $prog->kernel ("squareit");
		167
		168	=head2 Create some input and output float buffers, then call the
		169	'squareit' kernel on them.
		170
		171	my $input = $ctx->buffer_sv (OpenCL::MEM_COPY_HOST_PTR, pack "f*", 1, 2, 3, 4.5);
		172	my $output = $ctx->buffer (0, OpenCL::SIZEOF_FLOAT * 5);
		173
		174	# set buffer
		175	$kernel->set_buffer (0, $input);
		176	$kernel->set_buffer (1, $output);
		177
		178	# execute it for all 4 numbers
		179	$queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);
		180
		181	# enqueue a synchronous read
		182	$queue->enqueue_read_buffer ($output, 1, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);
		183
		184	# print the results:
		185	printf "%s\n", join ", ", unpack "f*", $data;
		186
		187	=head2 The same enqueue operations as before, but assuming an out-of-order queue,
		188	showing off barriers.
		189
		190	# execute it for all 4 numbers
		191	$queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);
		192
		193	# enqueue a barrier to ensure in-order execution
		194	$queue->enqueue_barrier;
		195
		196	# enqueue an async read
		197	$queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);
		198
		199	# wait for all requests to finish
		200	$queue->finish;
		201
		202	=head2 The same enqueue operations as before, but assuming an out-of-order queue,
		203	showing off event objects and wait lists.
		204
		205	# execute it for all 4 numbers
		206	my $ev = $queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);
		207
		208	# enqueue an async read
		209	$ev = $queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data, $ev);
		210
		211	# wait for the last event to complete
		212	$ev->wait;
		213
		214	=head2 Use the OpenGL module to share a texture between OpenCL and OpenGL and draw some julia
		215	set tunnel effect.
		216
		217	This is quite a long example to get you going.
		218
		219	use OpenGL ":all";
		220	use OpenCL;
		221
		222	# open a window and create a gl texture
		223	OpenGL::glpOpenWindow width => 256, height => 256;
		224	my $texid = glGenTextures_p 1;
		225	glBindTexture GL_TEXTURE_2D, $texid;
		226	glTexImage2D_c GL_TEXTURE_2D, 0, GL_RGBA8, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0;
		227
		228	# find and use the first opencl device that let's us get a shared opengl context
		229	my $platform;
		230	my $dev;
		231	my $ctx;
		232
		233	for (OpenCL::platforms) {
		234	$platform = $_;
		235	for ($platform->devices) {
		236	$dev = $_;
		237	$ctx = $platform->context ([OpenCL::GLX_DISPLAY_KHR, undef, OpenCL::GL_CONTEXT_KHR, undef], [$dev])
		238	and last;
		239	}
		240	}
		241
		242	$ctx
		243	or die "cannot find suitable OpenCL device\n";
		244
29	my $queue = $ctx->command_queue_simple ($dev);	245	my $queue = $ctx->queue ($dev);
		246
		247	# now attach an opencl image2d object to the opengl texture
		248	my $tex = $ctx->gl_texture2d (OpenCL::MEM_WRITE_ONLY, GL_TEXTURE_2D, 0, $texid);
		249
		250	# now the boring opencl code
		251	my $src = <<EOF;
		252	kernel void
		253	juliatunnel (write_only image2d_t img, float time)
		254	{
		255	float2 p = (float2)(get_global_id (0), get_global_id (1)) / 256.f * 2.f - 1.f;
		256
		257	float2 m = (float2)(1.f, p.y) / fabs (p.x);
		258	m.x = fabs (fmod (m.x + time * 0.05f, 4.f)) - 2.f;
		259
		260	float2 z = m;
		261	float2 c = (float2)(sin (time * 0.05005), cos (time * 0.06001));
		262
		263	for (int i = 0; i < 25 && dot (z, z) < 4.f; ++i)
		264	z = (float2)(z.x * z.x - z.y * z.y, 2.f * z.x * z.y) + c;
		265
		266	float3 colour = (float3)(z.x, z.y, z.x * z.y);
		267	write_imagef (img, (int2)(get_global_id (0), get_global_id (1)), (float4)(colour * p.x * p.x, 1.));
		268	}
		269	EOF
		270
		271	my $prog = $ctx->build_program ($src);
		272	my $kernel = $prog->kernel ("juliatunnel");
		273
		274	# program compiled, kernel ready, now draw and loop
		275
		276	for (my $time; ; ++$time) {
		277	# acquire objects from opengl
		278	$queue->enqueue_acquire_gl_objects ([$tex]);
		279
		280	# configure and run our kernel
		281	$kernel->set_image2d (0, $tex);
		282	$kernel->set_float (1, $time);
		283	$queue->enqueue_nd_range_kernel ($kernel, undef, [256, 256], undef);
		284
		285	# release objects to opengl again
		286	$queue->enqueue_release_gl_objects ([$tex]);
		287
		288	# wait
		289	$queue->finish;
		290
		291	# now draw the texture, the defaults should be all right
		292	glTexParameterf GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST;
		293
		294	glEnable GL_TEXTURE_2D;
		295	glBegin GL_QUADS;
		296	glTexCoord2f 0, 1; glVertex3i -1, -1, -1;
		297	glTexCoord2f 0, 0; glVertex3i 1, -1, -1;
		298	glTexCoord2f 1, 0; glVertex3i 1, 1, -1;
		299	glTexCoord2f 1, 1; glVertex3i -1, 1, -1;
		300	glEnd;
		301
		302	glXSwapBuffers;
		303
		304	select undef, undef, undef, 1/60;
		305	}
		306
		307	=head1 DOCUMENTATION
		308
		309	=head2 BASIC CONVENTIONS
		310
		311	This is not a one-to-one C-style translation of OpenCL to Perl - instead
		312	I attempted to make the interface as type-safe as possible by introducing
		313	object syntax where it makes sense. There are a number of important
		314	differences between the OpenCL C API and this module:
30		315
31	=over 4	316	=over 4
32		317
		318	=item * Object lifetime managament is automatic - there is no need
		319	to free objects explicitly (C<clReleaseXXX>), the release function
		320	is called automatically once all Perl references to it go away.
		321
		322	=item * OpenCL uses CamelCase for function names
		323	(e.g. C<clGetPlatformIDs>, C<clGetPlatformInfo>), while this module
		324	uses underscores as word separator and often leaves out prefixes
		325	(C<OpenCL::platforms>, C<< $platform->info >>).
		326
		327	=item * OpenCL often specifies fixed vector function arguments as short
		328	arrays (C<size_t origin[3]>), while this module explicitly expects the
		329	components as separate arguments (C<$orig_x, $orig_y, $orig_z>) in
		330	function calls.
		331
		332	=item * Structures are often specified by flattening out their components
		333	as with short vectors, and returned as arrayrefs.
		334
		335	=item * When enqueuing commands, the wait list is specified by adding
		336	extra arguments to the function - anywhere a C<$wait_events...> argument
		337	is documented this can be any number of event objects. As an extsnion
		338	implemented by this module, C<undef> values will be ignored in the event
		339	list.
		340
		341	=item * When enqueuing commands, if the enqueue method is called in void
		342	context, no event is created. In all other contexts an event is returned
		343	by the method.
		344
		345	=item * This module expects all functions to return C<CL_SUCCESS>. If any
		346	other status is returned the function will throw an exception, so you
		347	don't normally have to to any error checking.
		348
		349	=back
		350
		351	=head2 PERL AND OPENCL TYPES
		352
		353	This handy(?) table lists OpenCL types and their perl, PDL and pack/unpack
		354	format equivalents:
		355
		356	OpenCL perl PDL pack/unpack
		357	char IV - c
		358	uchar IV byte C
		359	short IV short s
		360	ushort IV ushort S
		361	int IV long? l
		362	uint IV - L
		363	long IV longlong q
		364	ulong IV - Q
		365	float NV float f
		366	half IV ushort S
		367	double NV double d
		368
		369	=head2 GLX SUPPORT
		370
		371	Due to the sad state that OpenGL support is in in Perl (mostly the OpenGL
		372	module, which has little to no documentation and has little to no support
		373	for glX), this module, as a special extension, treats context creation
		374	properties C<OpenCL::GLX_DISPLAY_KHR> and C<OpenCL::GL_CONTEXT_KHR>
		375	specially: If either or both of these are C<undef>, then the OpenCL
		376	module tries to dynamically resolve C<glXGetCurrentDisplay> and
		377	C<glXGetCurrentContext>, call these functions and use their return values
		378	instead.
		379
		380	For this to work, the OpenGL library must be loaded, a GLX context must
		381	have been created and be made current, and C<dlsym> must be available and
		382	capable of finding the function via C<RTLD_DEFAULT>.
		383
		384	=head2 EVENT SYSTEM
		385
		386	OpenCL can generate a number of (potentially) asynchronous events, for
		387	example, after compiling a program, to signal a context-related error or,
		388	perhaps most important, to signal completion of queued jobs (by setting
		389	callbacks on OpenCL::Event objects).
		390
		391	To facilitate this, this module maintains an event queue - each
		392	time an asynchronous event happens, it is queued, and perl will be
		393	interrupted. This is implemented via the L<Async::Interrupt> module. In
		394	addition, this module has L<AnyEvent> support, so it can seamlessly
		395	integrate itself into many event loops.
		396
		397	Since this module is a bit hard to understand, here are some case examples:
		398
		399	=head3 Don't use callbacks.
		400
		401	When your program never uses any callbacks, then there will never be any
		402	notifications you need to take care of, and therefore no need to worry
		403	about all this.
		404
		405	You can achieve a great deal by explicitly waiting for events, or using
		406	barriers and flush calls. In many programs, there is no need at all to
		407	tinker with asynchronous events.
		408
		409	=head3 Use AnyEvent
		410
		411	This module automatically registers a watcher that invokes all outstanding
		412	event callbacks when AnyEvent is initialised (and block asynchronous
		413	interruptions). Using this mode of operations is the safest and most
		414	recommended one.
		415
		416	To use this, simply use AnyEvent and this module normally, make sure you
		417	have an event loop running:
		418
		419	use Gtk2 -init;
		420	use AnyEvent;
		421
		422	# initialise AnyEvent, by creating a watcher, or:
		423	AnyEvent::detect;
		424
		425	my $e = $queue->enqueue_marker;
		426	$e->cb (sub {
		427	warn "opencl is finished\n";
		428	})
		429
		430	main Gtk2;
		431
		432	Note that this module will not initialise AnyEvent for you. Before
		433	AnyEvent is initialised, the module will asynchronously interrupt perl
		434	instead. To avoid any surprises, it's best to explicitly initialise
		435	AnyEvent.
		436
		437	You can temporarily enable asynchronous interruptions (see next paragraph)
		438	by calling C<$OpenCL::INTERRUPT->unblock> and disable them again by
		439	calling C<$OpenCL::INTERRUPT->block>.
		440
		441	=head3 Let yourself be interrupted at any time
		442
		443	This mode is the default unless AnyEvent is loaded and initialised. In
		444	this mode, OpenCL asynchronously interrupts a running perl program. The
		445	emphasis is on both I<asynchronously> and I<running> here.
		446
		447	Asynchronously means that perl might execute your callbacks at any
		448	time. For example, in the following code (I<THAT YOU SHOULD NOT COPY>),
		449	the C<until> loop following the marker call will be interrupted by the
		450	callback:
		451
		452	my $e = $queue->enqueue_marker;
		453	my $flag;
		454	$e->cb (sub { $flag = 1 });
		455	1 until $flag;
		456	# $flag is now 1
		457
		458	The reason why you shouldn't blindly copy the above code is that
		459	busy waiting is a really really bad thing, and really really bad for
		460	performance.
		461
		462	While at first this asynchronous business might look exciting, it can be
		463	really hard, because you need to be prepared for the callback code to be
		464	executed at any time, which limits the amount of things the callback code
		465	can do safely.
		466
		467	This can be mitigated somewhat by using C<<
		468	$OpenCL::INTERRUPT->scope_block >> (see the L<Async::Interrupt>
		469	documentation for details).
		470
		471	The other problem is that your program must be actively I<running> to be
		472	interrupted. When you calculate stuff, your program is running. When you
		473	hang in some C functions or other block execution (by calling C<sleep>,
		474	C<select>, running an event loop and so on), your program is waiting, not
		475	running.
		476
		477	One way around that would be to attach a read watcher to your event loop,
		478	listening for events on C<< $OpenCL::INTERRUPT->pipe_fileno >>, using a
		479	dummy callback (C<sub { }>) to temporarily execute some perl code.
		480
		481	That is then awfully close to using the built-in AnyEvent support above,
		482	though, so consider that one instead.
		483
		484	=head3 Be creative
		485
		486	OpenCL exports the L<Async::Interrupt> object it uses in the global
		487	variable C<$OpenCL::INTERRUPT>. You can configure it in any way you like.
		488
		489	So if you want to feel like a real pro, err, wait, if you feel no risk
		490	menas no fun, you can experiment by implementing your own mode of
		491	operations.
		492
33	=cut	493	=cut
34		494
35	package OpenCL;	495	package OpenCL;
36		496
		497	use common::sense;
		498	use Async::Interrupt ();
		499
		500	our $POLL_FUNC; # set by XS
		501
37	BEGIN {	502	BEGIN {
38	$VERSION = '0.01';	503	our $VERSION = '0.97';
39		504
40	require XSLoader;	505	require XSLoader;
41	XSLoader::load (__PACKAGE__, $VERSION);	506	XSLoader::load (__PACKAGE__, $VERSION);
		507
		508	@OpenCL::Platform::ISA =
		509	@OpenCL::Device::ISA =
		510	@OpenCL::Context::ISA =
		511	@OpenCL::Queue::ISA =
		512	@OpenCL::Memory::ISA =
		513	@OpenCL::Sampler::ISA =
		514	@OpenCL::Program::ISA =
		515	@OpenCL::Kernel::ISA =
		516	@OpenCL::Event::ISA = OpenCL::Object::;
		517
		518	@OpenCL::Buffer::ISA =
		519	@OpenCL::Image::ISA = OpenCL::Memory::;
		520
		521	@OpenCL::BufferObj::ISA = OpenCL::Buffer::;
		522
		523	@OpenCL::Image2D::ISA =
		524	@OpenCL::Image3D::ISA =
		525	@OpenCL::Image2DArray::ISA =
		526	@OpenCL::Image1D::ISA =
		527	@OpenCL::Image1DArray::ISA =
		528	@OpenCL::Image1DBuffer::ISA = OpenCL::Image::;
		529
		530	@OpenCL::UserEvent::ISA = OpenCL::Event::;
42	}	531	}
43		532
		533	=head2 THE OpenCL PACKAGE
		534
		535	=over 4
		536
		537	=item $int = OpenCL::errno
		538
		539	The last error returned by a function - it's only valid after an error occured
		540	and before calling another OpenCL function.
		541
		542	=item $str = OpenCL::err2str $errval
		543
		544	Comverts an error value into a human readable string.
		545
		546	=item $str = OpenCL::enum2str $enum
		547
		548	Converts most enum values (of parameter names, image format constants,
		549	object types, addressing and filter modes, command types etc.) into a
		550	human readable string. When confronted with some random integer it can be
		551	very helpful to pass it through this function to maybe get some readable
		552	string out of it.
		553
		554	=item @platforms = OpenCL::platforms
		555
		556	Returns all available OpenCL::Platform objects.
		557
		558	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetPlatformIDs.html>
		559
		560	=item $ctx = OpenCL::context_from_type $properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $callback->($err, $pvt) = $print_stderr
		561
		562	Tries to create a context from a default device and platform type - never worked for me.
		563
		564	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>
		565
		566	=item $ctx = OpenCL::context $properties, \@devices, $callback->($err, $pvt) = $print_stderr)
		567
		568	Create a new OpenCL::Context object using the given device object(s). This
		569	function isn't implemented yet, use C<< $platform->context >> instead.
		570
		571	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContext.html>
		572
		573	=item OpenCL::wait_for_events $wait_events...
		574
		575	Waits for all events to complete.
		576
		577	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>
		578
		579	=item OpenCL::poll
		580
		581	Checks if there are any outstanding events (see L<EVENT SYSTEM>) and
		582	invokes their callbacks.
		583
		584	=item $OpenCL::INTERRUPT
		585
		586	The L<Async::Interrupt> object used to signal asynchronous events (see
		587	L<EVENT SYSTEM>).
		588
		589	=cut
		590
		591	our $INTERRUPT = new Async::Interrupt c_cb => [$POLL_FUNC, 0];
		592
		593	&_eq_initialise ($INTERRUPT->signal_func);
		594
		595	=item $OpenCL::WATCHER
		596
		597	The L<AnyEvent> watcher object used to watch for asynchronous events (see
		598	L<EVENT SYSTEM>). This variable is C<undef> until L<AnyEvent> has been
		599	loaded I<and> initialised (e.g. by calling C<AnyEvent::detect>).
		600
		601	=cut
		602
		603	our $WATCHER;
		604
		605	sub _init_anyevent {
		606	$INTERRUPT->block;
		607	$WATCHER = AE::io ($INTERRUPT->pipe_fileno, 0, sub { $INTERRUPT->handle });
		608	}
		609
		610	if (defined $AnyEvent::MODEL) {
		611	_init_anyevent;
		612	} else {
		613	push @AnyEvent::post_detect, \&_init_anyevent;
		614	}
		615
		616	=back
		617
		618	=head2 THE OpenCL::Object CLASS
		619
		620	This is the base class for all objects in the OpenCL module. The only
		621	method it implements is the C<id> method, which is only useful if you want
		622	to interface to OpenCL on the C level.
		623
		624	=over 4
		625
		626	=item $iv = $obj->id
		627
		628	OpenCL objects are represented by pointers or integers on the C level. If
		629	you want to interface to an OpenCL object directly on the C level, then
		630	you need this value, which is returned by this method. You should use an
		631	C<IV> type in your code and cast that to the correct type.
		632
		633	=cut
		634
		635	sub OpenCL::Object::id {
		636	ref $_[0] eq "SCALAR"
		637	? ${ $_[0] }
		638	: $_[0][0]
		639	}
		640
		641	=back
		642
		643	=head2 THE OpenCL::Platform CLASS
		644
		645	=over 4
		646
		647	=item @devices = $platform->devices ($type = OpenCL::DEVICE_TYPE_ALL)
		648
		649	Returns a list of matching OpenCL::Device objects.
		650
		651	=item $ctx = $platform->context_from_type ($properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $callback->($err, $pvt) = $print_stderr)
		652
		653	Tries to create a context. Never worked for me, and you need devices explicitly anyway.
		654
		655	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>
		656
		657	=item $ctx = $platform->context ($properties, \@devices, $callback->($err, $pvt) = $print_stderr)
		658
		659	Create a new OpenCL::Context object using the given device object(s)- a
		660	CL_CONTEXT_PLATFORM property is supplied automatically.
		661
		662	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContext.html>
		663
		664	=item $packed_value = $platform->info ($name)
		665
		666	Calls C<clGetPlatformInfo> and returns the packed, raw value - for
		667	strings, this will be the string (possibly including terminating \0), for
		668	other values you probably need to use the correct C<unpack>.
		669
		670	It's best to avoid this method and use one of the following convenience
		671	wrappers.
		672
		673	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetPlatformInfo.html>
		674
		675	=item $platform->unload_compiler
		676
		677	Attempts to unload the compiler for this platform, for endless
		678	profit. Does nothing on OpenCL 1.1.
		679
		680	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clUnloadPlatformCompiler.html>
		681
		682	=for gengetinfo begin platform
		683
		684	=item $string = $platform->profile
		685
		686	Calls C<clGetPlatformInfo> with C<CL_PLATFORM_PROFILE> and returns the result.
		687
		688	=item $string = $platform->version
		689
		690	Calls C<clGetPlatformInfo> with C<CL_PLATFORM_VERSION> and returns the result.
		691
		692	=item $string = $platform->name
		693
		694	Calls C<clGetPlatformInfo> with C<CL_PLATFORM_NAME> and returns the result.
		695
		696	=item $string = $platform->vendor
		697
		698	Calls C<clGetPlatformInfo> with C<CL_PLATFORM_VENDOR> and returns the result.
		699
		700	=item $string = $platform->extensions
		701
		702	Calls C<clGetPlatformInfo> with C<CL_PLATFORM_EXTENSIONS> and returns the result.
		703
		704	=for gengetinfo end platform
		705
		706	=back
		707
		708	=head2 THE OpenCL::Device CLASS
		709
		710	=over 4
		711
		712	=item $packed_value = $device->info ($name)
		713
		714	See C<< $platform->info >> for details.
		715
		716	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetDeviceInfo.html>
		717
		718	=for gengetinfo begin device
		719
		720	=item $device_type = $device->type
		721
		722	Calls C<clGetDeviceInfo> with C<CL_DEVICE_TYPE> and returns the result.
		723
		724	=item $uint = $device->vendor_id
		725
		726	Calls C<clGetDeviceInfo> with C<CL_DEVICE_VENDOR_ID> and returns the result.
		727
		728	=item $uint = $device->max_compute_units
		729
		730	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_COMPUTE_UNITS> and returns the result.
		731
		732	=item $uint = $device->max_work_item_dimensions
		733
		734	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_WORK_ITEM_DIMENSIONS> and returns the result.
		735
		736	=item $int = $device->max_work_group_size
		737
		738	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_WORK_GROUP_SIZE> and returns the result.
		739
		740	=item @ints = $device->max_work_item_sizes
		741
		742	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_WORK_ITEM_SIZES> and returns the result.
		743
		744	=item $uint = $device->preferred_vector_width_char
		745
		746	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_CHAR> and returns the result.
		747
		748	=item $uint = $device->preferred_vector_width_short
		749
		750	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_SHORT> and returns the result.
		751
		752	=item $uint = $device->preferred_vector_width_int
		753
		754	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_INT> and returns the result.
		755
		756	=item $uint = $device->preferred_vector_width_long
		757
		758	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_LONG> and returns the result.
		759
		760	=item $uint = $device->preferred_vector_width_float
		761
		762	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT> and returns the result.
		763
		764	=item $uint = $device->preferred_vector_width_double
		765
		766	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE> and returns the result.
		767
		768	=item $uint = $device->max_clock_frequency
		769
		770	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_CLOCK_FREQUENCY> and returns the result.
		771
		772	=item $bitfield = $device->address_bits
		773
		774	Calls C<clGetDeviceInfo> with C<CL_DEVICE_ADDRESS_BITS> and returns the result.
		775
		776	=item $uint = $device->max_read_image_args
		777
		778	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_READ_IMAGE_ARGS> and returns the result.
		779
		780	=item $uint = $device->max_write_image_args
		781
		782	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_WRITE_IMAGE_ARGS> and returns the result.
		783
		784	=item $ulong = $device->max_mem_alloc_size
		785
		786	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_MEM_ALLOC_SIZE> and returns the result.
		787
		788	=item $int = $device->image2d_max_width
		789
		790	Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE2D_MAX_WIDTH> and returns the result.
		791
		792	=item $int = $device->image2d_max_height
		793
		794	Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE2D_MAX_HEIGHT> and returns the result.
		795
		796	=item $int = $device->image3d_max_width
		797
		798	Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE3D_MAX_WIDTH> and returns the result.
		799
		800	=item $int = $device->image3d_max_height
		801
		802	Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE3D_MAX_HEIGHT> and returns the result.
		803
		804	=item $int = $device->image3d_max_depth
		805
		806	Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE3D_MAX_DEPTH> and returns the result.
		807
		808	=item $uint = $device->image_support
		809
		810	Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE_SUPPORT> and returns the result.
		811
		812	=item $int = $device->max_parameter_size
		813
		814	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_PARAMETER_SIZE> and returns the result.
		815
		816	=item $uint = $device->max_samplers
		817
		818	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_SAMPLERS> and returns the result.
		819
		820	=item $uint = $device->mem_base_addr_align
		821
		822	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MEM_BASE_ADDR_ALIGN> and returns the result.
		823
		824	=item $uint = $device->min_data_type_align_size
		825
		826	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MIN_DATA_TYPE_ALIGN_SIZE> and returns the result.
		827
		828	=item $device_fp_config = $device->single_fp_config
		829
		830	Calls C<clGetDeviceInfo> with C<CL_DEVICE_SINGLE_FP_CONFIG> and returns the result.
		831
		832	=item $device_mem_cache_type = $device->global_mem_cache_type
		833
		834	Calls C<clGetDeviceInfo> with C<CL_DEVICE_GLOBAL_MEM_CACHE_TYPE> and returns the result.
		835
		836	=item $uint = $device->global_mem_cacheline_size
		837
		838	Calls C<clGetDeviceInfo> with C<CL_DEVICE_GLOBAL_MEM_CACHELINE_SIZE> and returns the result.
		839
		840	=item $ulong = $device->global_mem_cache_size
		841
		842	Calls C<clGetDeviceInfo> with C<CL_DEVICE_GLOBAL_MEM_CACHE_SIZE> and returns the result.
		843
		844	=item $ulong = $device->global_mem_size
		845
		846	Calls C<clGetDeviceInfo> with C<CL_DEVICE_GLOBAL_MEM_SIZE> and returns the result.
		847
		848	=item $ulong = $device->max_constant_buffer_size
		849
		850	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE> and returns the result.
		851
		852	=item $uint = $device->max_constant_args
		853
		854	Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_CONSTANT_ARGS> and returns the result.
		855
		856	=item $device_local_mem_type = $device->local_mem_type
		857
		858	Calls C<clGetDeviceInfo> with C<CL_DEVICE_LOCAL_MEM_TYPE> and returns the result.
		859
		860	=item $ulong = $device->local_mem_size
		861
		862	Calls C<clGetDeviceInfo> with C<CL_DEVICE_LOCAL_MEM_SIZE> and returns the result.
		863
		864	=item $boolean = $device->error_correction_support
		865
		866	Calls C<clGetDeviceInfo> with C<CL_DEVICE_ERROR_CORRECTION_SUPPORT> and returns the result.
		867
		868	=item $int = $device->profiling_timer_resolution
		869
		870	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PROFILING_TIMER_RESOLUTION> and returns the result.
		871
		872	=item $boolean = $device->endian_little
		873
		874	Calls C<clGetDeviceInfo> with C<CL_DEVICE_ENDIAN_LITTLE> and returns the result.
		875
		876	=item $boolean = $device->available
		877
		878	Calls C<clGetDeviceInfo> with C<CL_DEVICE_AVAILABLE> and returns the result.
		879
		880	=item $boolean = $device->compiler_available
		881
		882	Calls C<clGetDeviceInfo> with C<CL_DEVICE_COMPILER_AVAILABLE> and returns the result.
		883
		884	=item $device_exec_capabilities = $device->execution_capabilities
		885
		886	Calls C<clGetDeviceInfo> with C<CL_DEVICE_EXECUTION_CAPABILITIES> and returns the result.
		887
		888	=item $command_queue_properties = $device->properties
		889
		890	Calls C<clGetDeviceInfo> with C<CL_DEVICE_QUEUE_PROPERTIES> and returns the result.
		891
		892	=item $ = $device->platform
		893
		894	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PLATFORM> and returns the result.
		895
		896	=item $string = $device->name
		897
		898	Calls C<clGetDeviceInfo> with C<CL_DEVICE_NAME> and returns the result.
		899
		900	=item $string = $device->vendor
		901
		902	Calls C<clGetDeviceInfo> with C<CL_DEVICE_VENDOR> and returns the result.
		903
		904	=item $string = $device->driver_version
		905
		906	Calls C<clGetDeviceInfo> with C<CL_DRIVER_VERSION> and returns the result.
		907
		908	=item $string = $device->profile
		909
		910	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PROFILE> and returns the result.
		911
		912	=item $string = $device->version
		913
		914	Calls C<clGetDeviceInfo> with C<CL_DEVICE_VERSION> and returns the result.
		915
		916	=item $string = $device->extensions
		917
		918	Calls C<clGetDeviceInfo> with C<CL_DEVICE_EXTENSIONS> and returns the result.
		919
		920	=item $uint = $device->preferred_vector_width_half
		921
		922	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_HALF> and returns the result.
		923
		924	=item $uint = $device->native_vector_width_char
		925
		926	Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_CHAR> and returns the result.
		927
		928	=item $uint = $device->native_vector_width_short
		929
		930	Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_SHORT> and returns the result.
		931
		932	=item $uint = $device->native_vector_width_int
		933
		934	Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_INT> and returns the result.
		935
		936	=item $uint = $device->native_vector_width_long
		937
		938	Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_LONG> and returns the result.
		939
		940	=item $uint = $device->native_vector_width_float
		941
		942	Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_FLOAT> and returns the result.
		943
		944	=item $uint = $device->native_vector_width_double
		945
		946	Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_DOUBLE> and returns the result.
		947
		948	=item $uint = $device->native_vector_width_half
		949
		950	Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_HALF> and returns the result.
		951
		952	=item $device_fp_config = $device->double_fp_config
		953
		954	Calls C<clGetDeviceInfo> with C<CL_DEVICE_DOUBLE_FP_CONFIG> and returns the result.
		955
		956	=item $device_fp_config = $device->half_fp_config
		957
		958	Calls C<clGetDeviceInfo> with C<CL_DEVICE_HALF_FP_CONFIG> and returns the result.
		959
		960	=item $boolean = $device->host_unified_memory
		961
		962	Calls C<clGetDeviceInfo> with C<CL_DEVICE_HOST_UNIFIED_MEMORY> and returns the result.
		963
		964	=item $device = $device->parent_device_ext
		965
		966	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PARENT_DEVICE_EXT> and returns the result.
		967
		968	=item @device_partition_property_exts = $device->partition_types_ext
		969
		970	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PARTITION_TYPES_EXT> and returns the result.
		971
		972	=item @device_partition_property_exts = $device->affinity_domains_ext
		973
		974	Calls C<clGetDeviceInfo> with C<CL_DEVICE_AFFINITY_DOMAINS_EXT> and returns the result.
		975
		976	=item $uint = $device->reference_count_ext
		977
		978	Calls C<clGetDeviceInfo> with C<CL_DEVICE_REFERENCE_COUNT_EXT> and returns the result.
		979
		980	=item @device_partition_property_exts = $device->partition_style_ext
		981
		982	Calls C<clGetDeviceInfo> with C<CL_DEVICE_PARTITION_STYLE_EXT> and returns the result.
		983
		984	=for gengetinfo end device
		985
		986	=back
		987
		988	=head2 THE OpenCL::Context CLASS
		989
		990	=over 4
		991
		992	=item $prog = $ctx->build_program ($program, $options = "")
		993
		994	This convenience function tries to build the program on all devices in
		995	the context. If the build fails, then the function will C<croak> with the
		996	build log. Otherwise ti returns the program object.
		997
		998	The C<$program> can either be a C<OpenCL::Program> object or a string
		999	containing the program. In the latter case, a program objetc will be
		1000	created automatically.
		1001
		1002	=cut
		1003
		1004	sub OpenCL::Context::build_program {
		1005	my ($self, $prog, $options) = @_;
		1006
		1007	require Carp;
		1008
		1009	$prog = $self->program_with_source ($prog)
		1010	unless ref $prog;
		1011
		1012	# we build separately per device so we instantly know which one failed
		1013	for my $dev ($self->devices) {
		1014	eval { $prog->build ([$dev], $options); 1 }
		1015	or Carp::croak ("Building OpenCL program for device '" . $dev->name . "' failed:\n"
		1016	. $prog->build_log ($dev));
		1017	}
		1018
		1019	$prog
		1020	}
		1021
		1022	=item $queue = $ctx->queue ($device, $properties)
		1023
		1024	Create a new OpenCL::Queue object from the context and the given device.
		1025
		1026	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateCommandQueue.html>
		1027
		1028	Example: create an out-of-order queue.
		1029
		1030	$queue = $ctx->queue ($device, OpenCL::QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE);
		1031
		1032	=item $ev = $ctx->user_event
		1033
		1034	Creates a new OpenCL::UserEvent object.
		1035
		1036	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateUserEvent.html>
		1037
		1038	=item $buf = $ctx->buffer ($flags, $len)
		1039
		1040	Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object with the
		1041	given flags and octet-size.
		1042
		1043	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateBuffer.html>
		1044
		1045	=item $buf = $ctx->buffer_sv ($flags, $data)
		1046
		1047	Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object and
		1048	initialise it with the given data values.
		1049
		1050	=item $img = $ctx->image ($self, $flags, $channel_order, $channel_type, $type, $width, $height, $depth, $array_size = 0, $row_pitch = 0, $slice_pitch = 0, $num_mip_level = 0, $num_samples = 0, $*data = &PL_sv_undef)
		1051
		1052	Creates a new OpenCL::Image object and optionally initialises it with
		1053	the given data values.
		1054
		1055	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateImage.html>
		1056
		1057	=item $img = $ctx->image2d ($flags, $channel_order, $channel_type, $width, $height, $row_pitch = 0, $data = undef)
		1058
		1059	Creates a new OpenCL::Image2D object and optionally initialises it with
		1060	the given data values.
		1061
		1062	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateImage2D.html>
		1063
		1064	=item $img = $ctx->image3d ($flags, $channel_order, $channel_type, $width, $height, $depth, $row_pitch = 0, $slice_pitch = 0, $data = undef)
		1065
		1066	Creates a new OpenCL::Image3D object and optionally initialises it with
		1067	the given data values.
		1068
		1069	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateImage3D.html>
		1070
		1071	=item $buffer = $ctx->gl_buffer ($flags, $bufobj)
		1072
		1073	Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object that refers to the given
		1074	OpenGL buffer object.
		1075
		1076	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLBuffer.html
		1077
		1078	=item $img = $ctx->gl_texture ($flags, $target, $miplevel, $texture)
		1079
		1080	Creates a new OpenCL::Image object that refers to the given OpenGL
		1081	texture object or buffer.
		1082
		1083	http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateFromGLTexture.html
		1084
		1085	=item $img = $ctx->gl_texture2d ($flags, $target, $miplevel, $texture)
		1086
		1087	Creates a new OpenCL::Image2D object that refers to the given OpenGL
		1088	2D texture object.
		1089
		1090	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLTexture2D.html
		1091
		1092	=item $img = $ctx->gl_texture3d ($flags, $target, $miplevel, $texture)
		1093
		1094	Creates a new OpenCL::Image3D object that refers to the given OpenGL
		1095	3D texture object.
		1096
		1097	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLTexture3D.html
		1098
		1099	=item $ctx->gl_renderbuffer ($flags, $renderbuffer)
		1100
		1101	Creates a new OpenCL::Image2D object that refers to the given OpenGL
		1102	render buffer.
		1103
		1104	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLRenderbuffer.html
		1105
		1106	=item @formats = $ctx->supported_image_formats ($flags, $image_type)
		1107
		1108	Returns a list of matching image formats - each format is an arrayref with
		1109	two values, $channel_order and $channel_type, in it.
		1110
		1111	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetSupportedImageFormats.html>
		1112
		1113	=item $sampler = $ctx->sampler ($normalized_coords, $addressing_mode, $filter_mode)
		1114
		1115	Creates a new OpenCL::Sampler object.
		1116
		1117	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateSampler.html>
		1118
		1119	=item $program = $ctx->program_with_source ($string)
		1120
		1121	Creates a new OpenCL::Program object from the given source code.
		1122
		1123	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateProgramWithSource.html>
		1124
		1125	=item $packed_value = $ctx->info ($name)
		1126
		1127	See C<< $platform->info >> for details.
		1128
		1129	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetContextInfo.html>
		1130
		1131	=for gengetinfo begin context
		1132
		1133	=item $uint = $context->reference_count
		1134
		1135	Calls C<clGetContextInfo> with C<CL_CONTEXT_REFERENCE_COUNT> and returns the result.
		1136
		1137	=item @devices = $context->devices
		1138
		1139	Calls C<clGetContextInfo> with C<CL_CONTEXT_DEVICES> and returns the result.
		1140
		1141	=item @property_ints = $context->properties
		1142
		1143	Calls C<clGetContextInfo> with C<CL_CONTEXT_PROPERTIES> and returns the result.
		1144
		1145	=item $uint = $context->num_devices
		1146
		1147	Calls C<clGetContextInfo> with C<CL_CONTEXT_NUM_DEVICES> and returns the result.
		1148
		1149	=for gengetinfo end context
		1150
		1151	=back
		1152
		1153	=head2 THE OpenCL::Queue CLASS
		1154
		1155	An OpenCL::Queue represents an execution queue for OpenCL. You execute
		1156	requests by calling their respective C<enqueue_xxx> method and waitinf for
		1157	it to complete in some way.
		1158
		1159	All the enqueue methods return an event object that can be used to wait
		1160	for completion, unless the method is called in void context, in which case
		1161	no event object is created.
		1162
		1163	They also allow you to specify any number of other event objects that this
		1164	request has to wait for before it starts executing, by simply passing the
		1165	event objects as extra parameters to the enqueue methods. To simplify
		1166	program design, this module ignores any C<undef> values in the list of
		1167	events. This makes it possible to code operations such as this, without
		1168	having to put a valid event object into C<$event> first:
		1169
		1170	$event = $queue->enqueue_xxx (..., $event);
		1171
		1172	Queues execute in-order by default, without any parallelism, so in most
		1173	cases (i.e. you use only one queue) it's not necessary to wait for or
		1174	create event objects, althoguh an our of order queue is often a bit
		1175	faster.
		1176
		1177	=over 4
		1178
		1179	=item $ev = $queue->enqueue_read_buffer ($buffer, $blocking, $offset, $len, $data, $wait_events...)
		1180
		1181	Reads data from buffer into the given string.
		1182
		1183	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBuffer.html>
		1184
		1185	=item $ev = $queue->enqueue_write_buffer ($buffer, $blocking, $offset, $data, $wait_events...)
		1186
		1187	Writes data to buffer from the given string.
		1188
		1189	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBuffer.html>
		1190
		1191	=item $ev = $queue->enqueue_copy_buffer ($src, $dst, $src_offset, $dst_offset, $len, $wait_events...)
		1192
		1193	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBuffer.html>
		1194
		1195	=item $ev = $queue->enqueue_read_buffer_rect (OpenCL::Memory buf, cl_bool blocking, $buf_x, $buf_y, $buf_z, $host_x, $host_y, $host_z, $width, $height, $depth, $buf_row_pitch, $buf_slice_pitch, $host_row_pitch, $host_slice_pitch, $data, $wait_events...)
		1196
		1197	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBufferRect.html
		1198
		1199	=item $ev = $queue->enqueue_write_buffer_rect (OpenCL::Memory buf, cl_bool blocking, $buf_x, $buf_y, $buf_z, $host_x, $host_y, $host_z, $width, $height, $depth, $buf_row_pitch, $buf_slice_pitch, $host_row_pitch, $host_slice_pitch, $data, $wait_events...)
		1200
		1201	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBufferRect.html
		1202
		1203	=item $ev = $queue->enqueue_read_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)
		1204
		1205	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferRect.html>
		1206
		1207	=item $ev = $queue->enqueue_copy_buffer_to_image ($src_buffer, $dst_image, $src_offset, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)
		1208
		1209	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadImage.html>
		1210
		1211	=item $ev = $queue->enqueue_write_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)
		1212
		1213	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteImage.html>
		1214
		1215	=item $ev = $queue->enqueue_copy_image ($src_image, $dst_image, $src_x, $src_y, $src_z, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)
		1216
		1217	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImage.html>
		1218
		1219	=item $ev = $queue->enqueue_copy_image_to_buffer ($src_image, $dst_image, $src_x, $src_y, $src_z, $width, $height, $depth, $dst_offset, $wait_events...)
		1220
		1221	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImageToBuffer.html>
		1222
		1223	=item $ev = $queue->enqueue_copy_buffer_rect ($src, $dst, $src_x, $src_y, $src_z, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $src_row_pitch, $src_slice_pitch, $dst_row_pitch, $dst_slice_pitch, $wait_event...)
		1224
		1225	Yeah.
		1226
		1227	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferToImage.html>.
		1228
		1229	=item $ev = $queue->enqueue_fill_buffer ($mem, $pattern, $offset, $size, ...)
		1230
		1231	Fills the given buffer object with repeated applications of C<$pattern>,
		1232	starting at C<$offset> for C<$size> octets.
		1233
		1234	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueFillBuffer.html>
		1235
		1236	=item $ev = $queue->enqueue_fill_image ($img, $r, $g, $b, $a, $x, $y, $z, $width, $height, $depth, ...)
		1237
		1238	Fills the given image area with the given rgba colour components. The
		1239	components are normally floating point values between C<0> and C<1>,
		1240	except when the image channel data type is a signe dor unsigned
		1241	unnormalised format, in which case the range is determined by the format.
		1242
		1243	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueFillImage.html>
		1244
		1245	=item $ev = $queue->enqueue_task ($kernel, $wait_events...)
		1246
		1247	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueTask.html>
		1248
		1249	=item $ev = $queue->enqueue_nd_range_kernel ($kernel, \@global_work_offset, \@global_work_size, \@local_work_size, $wait_events...)
		1250
		1251	Enqueues a kernel execution.
		1252
		1253	\@global_work_size must be specified as a reference to an array of
		1254	integers specifying the work sizes (element counts).
		1255
		1256	\@global_work_offset must be either C<undef> (in which case all offsets
		1257	are C<0>), or a reference to an array of work offsets, with the same number
		1258	of elements as \@global_work_size.
		1259
		1260	\@local_work_size must be either C<undef> (in which case the
		1261	implementation is supposed to choose good local work sizes), or a
		1262	reference to an array of local work sizes, with the same number of
		1263	elements as \@global_work_size.
		1264
		1265	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueNDRangeKernel.html>
		1266
		1267	=item $ev = $queue->enqueue_acquire_gl_objects ([object, ...], $wait_events...)
		1268
		1269	Enqueues a list (an array-ref of OpenCL::Memory objects) to be acquired
		1270	for subsequent OpenCL usage.
		1271
		1272	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueAcquireGLObjects.html>
		1273
		1274	=item $ev = $queue->enqueue_release_gl_objects ([object, ...], $wait_events...)
		1275
		1276	Enqueues a list (an array-ref of OpenCL::Memory objects) to be released
		1277	for subsequent OpenGL usage.
		1278
		1279	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReleaseGLObjects.html>
		1280
		1281	=item $ev = $queue->enqueue_wait_for_events ($wait_events...)
		1282
		1283	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWaitForEvents.html>
		1284
		1285	=item $ev = $queue->enqueue_marker ($wait_events...)
		1286
		1287	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueMarkerWithWaitList.html>
		1288
		1289	=item $ev = $queue->enqueue_barrier ($wait_events...)
		1290
		1291	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueBarrierWithWaitList.html>
		1292
		1293	=item $queue->flush
		1294
		1295	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clFlush.html>
		1296
		1297	=item $queue->finish
		1298
		1299	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clFinish.html>
		1300
		1301	=item $packed_value = $queue->info ($name)
		1302
		1303	See C<< $platform->info >> for details.
		1304
		1305	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetCommandQueueInfo.html>
		1306
		1307	=for gengetinfo begin command_queue
		1308
		1309	=item $ctx = $command_queue->context
		1310
		1311	Calls C<clGetCommandQueueInfo> with C<CL_QUEUE_CONTEXT> and returns the result.
		1312
		1313	=item $device = $command_queue->device
		1314
		1315	Calls C<clGetCommandQueueInfo> with C<CL_QUEUE_DEVICE> and returns the result.
		1316
		1317	=item $uint = $command_queue->reference_count
		1318
		1319	Calls C<clGetCommandQueueInfo> with C<CL_QUEUE_REFERENCE_COUNT> and returns the result.
		1320
		1321	=item $command_queue_properties = $command_queue->properties
		1322
		1323	Calls C<clGetCommandQueueInfo> with C<CL_QUEUE_PROPERTIES> and returns the result.
		1324
		1325	=for gengetinfo end command_queue
		1326
		1327	=back
		1328
		1329	=head2 THE OpenCL::Memory CLASS
		1330
		1331	This the superclass of all memory objects - OpenCL::Buffer, OpenCL::Image,
		1332	OpenCL::Image2D and OpenCL::Image3D.
		1333
		1334	=over 4
		1335
		1336	=item $packed_value = $memory->info ($name)
		1337
		1338	See C<< $platform->info >> for details.
		1339
		1340	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetMemObjectInfo.html>
		1341
		1342	=for gengetinfo begin mem
		1343
		1344	=item $mem_object_type = $mem->type
		1345
		1346	Calls C<clGetMemObjectInfo> with C<CL_MEM_TYPE> and returns the result.
		1347
		1348	=item $mem_flags = $mem->flags
		1349
		1350	Calls C<clGetMemObjectInfo> with C<CL_MEM_FLAGS> and returns the result.
		1351
		1352	=item $int = $mem->size
		1353
		1354	Calls C<clGetMemObjectInfo> with C<CL_MEM_SIZE> and returns the result.
		1355
		1356	=item $ptr_value = $mem->host_ptr
		1357
		1358	Calls C<clGetMemObjectInfo> with C<CL_MEM_HOST_PTR> and returns the result.
		1359
		1360	=item $uint = $mem->map_count
		1361
		1362	Calls C<clGetMemObjectInfo> with C<CL_MEM_MAP_COUNT> and returns the result.
		1363
		1364	=item $uint = $mem->reference_count
		1365
		1366	Calls C<clGetMemObjectInfo> with C<CL_MEM_REFERENCE_COUNT> and returns the result.
		1367
		1368	=item $ctx = $mem->context
		1369
		1370	Calls C<clGetMemObjectInfo> with C<CL_MEM_CONTEXT> and returns the result.
		1371
		1372	=item $mem = $mem->associated_memobject
		1373
		1374	Calls C<clGetMemObjectInfo> with C<CL_MEM_ASSOCIATED_MEMOBJECT> and returns the result.
		1375
		1376	=item $int = $mem->offset
		1377
		1378	Calls C<clGetMemObjectInfo> with C<CL_MEM_OFFSET> and returns the result.
		1379
		1380	=for gengetinfo end mem
		1381
		1382	=item ($type, $name) = $mem->gl_object_info
		1383
		1384	Returns the OpenGL object type (e.g. OpenCL::GL_OBJECT_TEXTURE2D) and the
		1385	object "name" (e.g. the texture name) used to create this memory object.
		1386
		1387	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetGLObjectInfo.html>
		1388
		1389	=back
		1390
		1391	=head2 THE OpenCL::Buffer CLASS
		1392
		1393	This is a subclass of OpenCL::Memory, and the superclass of
		1394	OpenCL::BufferObj. Its purpose is simply to distinguish between buffers
		1395	and sub-buffers.
		1396
		1397	=head2 THE OpenCL::BufferObj CLASS
		1398
		1399	This is a subclass of OpenCL::Buffer and thus OpenCL::Memory. It exists
		1400	because one cna create sub buffers of OpenLC::BufferObj objects, but not
		1401	sub buffers from these sub buffers.
		1402
		1403	=over 4
		1404
		1405	=item $subbuf = $buf_obj->sub_buffer_region ($flags, $origin, $size)
		1406
		1407	Creates an OpenCL::Buffer objects from this buffer and returns it. The
		1408	C<buffer_create_type> is assumed to be C<CL_BUFFER_CREATE_TYPE_REGION>.
		1409
		1410	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateSubBuffer.html>
		1411
		1412	=back
		1413
		1414	=head2 THE OpenCL::Image CLASS
		1415
		1416	This is the superclass of all image objects - OpenCL::Image1D,
		1417	OpenCL::Image1DArray, OpenCL::Image1DBuffer, OpenCL::Image2D,
		1418	OpenCL::Image2DArray and OpenCL::Image3D.
		1419
		1420	=over 4
		1421
		1422	=item $packed_value = $image->image_info ($name)
		1423
		1424	See C<< $platform->info >> for details.
		1425
		1426	The reason this method is not called C<info> is that there already is an
		1427	C<< ->info >> method inherited from C<OpenCL::Memory>.
		1428
		1429	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetImageInfo.html>
		1430
		1431	=item ($channel_order, $channel_data_type) = $image->format
		1432
		1433	Returns the channel order and type used to create the image by calling
		1434	C<clGetImageInfo> with C<CL_IMAGE_FORMAT>.
		1435
		1436	=for gengetinfo begin image
		1437
		1438	=item $int = $image->element_size
		1439
		1440	Calls C<clGetImageInfo> with C<CL_IMAGE_ELEMENT_SIZE> and returns the result.
		1441
		1442	=item $int = $image->row_pitch
		1443
		1444	Calls C<clGetImageInfo> with C<CL_IMAGE_ROW_PITCH> and returns the result.
		1445
		1446	=item $int = $image->slice_pitch
		1447
		1448	Calls C<clGetImageInfo> with C<CL_IMAGE_SLICE_PITCH> and returns the result.
		1449
		1450	=item $int = $image->width
		1451
		1452	Calls C<clGetImageInfo> with C<CL_IMAGE_WIDTH> and returns the result.
		1453
		1454	=item $int = $image->height
		1455
		1456	Calls C<clGetImageInfo> with C<CL_IMAGE_HEIGHT> and returns the result.
		1457
		1458	=item $int = $image->depth
		1459
		1460	Calls C<clGetImageInfo> with C<CL_IMAGE_DEPTH> and returns the result.
		1461
		1462	=for gengetinfo end image
		1463
		1464	=for gengetinfo begin gl_texture
		1465
		1466	=item $GLenum = $gl_texture->target
		1467
		1468	Calls C<clGetGLTextureInfo> with C<CL_GL_TEXTURE_TARGET> and returns the result.
		1469
		1470	=item $GLint = $gl_texture->gl_mipmap_level
		1471
		1472	Calls C<clGetGLTextureInfo> with C<CL_GL_MIPMAP_LEVEL> and returns the result.
		1473
		1474	=for gengetinfo end gl_texture
		1475
		1476	=back
		1477
		1478	=head2 THE OpenCL::Sampler CLASS
		1479
		1480	=over 4
		1481
		1482	=item $packed_value = $sampler->info ($name)
		1483
		1484	See C<< $platform->info >> for details.
		1485
		1486	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetSamplerInfo.html>
		1487
		1488	=for gengetinfo begin sampler
		1489
		1490	=item $uint = $sampler->reference_count
		1491
		1492	Calls C<clGetSamplerInfo> with C<CL_SAMPLER_REFERENCE_COUNT> and returns the result.
		1493
		1494	=item $ctx = $sampler->context
		1495
		1496	Calls C<clGetSamplerInfo> with C<CL_SAMPLER_CONTEXT> and returns the result.
		1497
		1498	=item $addressing_mode = $sampler->normalized_coords
		1499
		1500	Calls C<clGetSamplerInfo> with C<CL_SAMPLER_NORMALIZED_COORDS> and returns the result.
		1501
		1502	=item $filter_mode = $sampler->addressing_mode
		1503
		1504	Calls C<clGetSamplerInfo> with C<CL_SAMPLER_ADDRESSING_MODE> and returns the result.
		1505
		1506	=item $boolean = $sampler->filter_mode
		1507
		1508	Calls C<clGetSamplerInfo> with C<CL_SAMPLER_FILTER_MODE> and returns the result.
		1509
		1510	=for gengetinfo end sampler
		1511
		1512	=back
		1513
		1514	=head2 THE OpenCL::Program CLASS
		1515
		1516	=over 4
		1517
		1518	=item $program->build (\@devices = undef, $options = "", $cb->($program) = undef)
		1519
		1520	Tries to build the program with the given options. See also the
		1521	C<$ctx->build> convenience function.
		1522
		1523	If a callback is specified, then it will be called when compilation is
		1524	finished. Note that many OpenCL implementations block your program while
		1525	compiling whether you use a callback or not. See C<build_async> if you
		1526	want to make sure the build is done in the background.
		1527
		1528	Note that some OpenCL implementations atc up badly, and don't call the
		1529	callback in some error cases (but call it in others). This implementation
		1530	assumes the callback will always be called, and leaks memory if this is
		1531	not so. So best make sure you don't pass in invalid values.
		1532
		1533	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clBuildProgram.html>
		1534
		1535	=item $program->build_async (\@devices = undef, $options = "", $cb->($program) = undef)
		1536
		1537	Similar to C<< ->build >>, except it starts a thread, and never fails (you
		1538	need to check the compilation status form the callback, or by polling).
		1539
		1540	=item $packed_value = $program->build_info ($device, $name)
		1541
		1542	Similar to C<< $platform->info >>, but returns build info for a previous
		1543	build attempt for the given device.
		1544
		1545	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetBuildInfo.html>
		1546
		1547	=item $kernel = $program->kernel ($function_name)
		1548
		1549	Creates an OpenCL::Kernel object out of the named C<__kernel> function in
		1550	the program.
		1551
		1552	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateKernel.html>
		1553
		1554	=item @kernels = $program->kernels_in_program
		1555
		1556	Returns all kernels successfully compiled for all devices in program.
		1557
		1558	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateKernelsInProgram.html
		1559
		1560	=for gengetinfo begin program_build
		1561
		1562	=item $build_status = $program->build_status ($device)
		1563
		1564	Calls C<clGetProgramBuildInfo> with C<CL_PROGRAM_BUILD_STATUS> and returns the result.
		1565
		1566	=item $string = $program->build_options ($device)
		1567
		1568	Calls C<clGetProgramBuildInfo> with C<CL_PROGRAM_BUILD_OPTIONS> and returns the result.
		1569
		1570	=item $string = $program->build_log ($device)
		1571
		1572	Calls C<clGetProgramBuildInfo> with C<CL_PROGRAM_BUILD_LOG> and returns the result.
		1573
		1574	=for gengetinfo end program_build
		1575
		1576	=item $packed_value = $program->info ($name)
		1577
		1578	See C<< $platform->info >> for details.
		1579
		1580	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetProgramInfo.html>
		1581
		1582	=for gengetinfo begin program
		1583
		1584	=item $uint = $program->reference_count
		1585
		1586	Calls C<clGetProgramInfo> with C<CL_PROGRAM_REFERENCE_COUNT> and returns the result.
		1587
		1588	=item $ctx = $program->context
		1589
		1590	Calls C<clGetProgramInfo> with C<CL_PROGRAM_CONTEXT> and returns the result.
		1591
		1592	=item $uint = $program->num_devices
		1593
		1594	Calls C<clGetProgramInfo> with C<CL_PROGRAM_NUM_DEVICES> and returns the result.
		1595
		1596	=item @devices = $program->devices
		1597
		1598	Calls C<clGetProgramInfo> with C<CL_PROGRAM_DEVICES> and returns the result.
		1599
		1600	=item $string = $program->source
		1601
		1602	Calls C<clGetProgramInfo> with C<CL_PROGRAM_SOURCE> and returns the result.
		1603
		1604	=item @ints = $program->binary_sizes
		1605
		1606	Calls C<clGetProgramInfo> with C<CL_PROGRAM_BINARY_SIZES> and returns the result.
		1607
		1608	=for gengetinfo end program
		1609
		1610	=item @blobs = $program->binaries
		1611
		1612	Returns a string for the compiled binary for every device associated with
		1613	the program, empty strings indicate missing programs, and an empty result
		1614	means no program binaries are available.
		1615
		1616	These "binaries" are often, in fact, informative low-level assembly
		1617	sources.
		1618
		1619	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetProgramInfo.html>
		1620
		1621	=back
		1622
		1623	=head2 THE OpenCL::Kernel CLASS
		1624
		1625	=over 4
		1626
		1627	=item $packed_value = $kernel->info ($name)
		1628
		1629	See C<< $platform->info >> for details.
		1630
		1631	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetKernelInfo.html>
		1632
		1633	=for gengetinfo begin kernel
		1634
		1635	=item $string = $kernel->function_name
		1636
		1637	Calls C<clGetKernelInfo> with C<CL_KERNEL_FUNCTION_NAME> and returns the result.
		1638
		1639	=item $uint = $kernel->num_args
		1640
		1641	Calls C<clGetKernelInfo> with C<CL_KERNEL_NUM_ARGS> and returns the result.
		1642
		1643	=item $uint = $kernel->reference_count
		1644
		1645	Calls C<clGetKernelInfo> with C<CL_KERNEL_REFERENCE_COUNT> and returns the result.
		1646
		1647	=item $ctx = $kernel->context
		1648
		1649	Calls C<clGetKernelInfo> with C<CL_KERNEL_CONTEXT> and returns the result.
		1650
		1651	=item $program = $kernel->program
		1652
		1653	Calls C<clGetKernelInfo> with C<CL_KERNEL_PROGRAM> and returns the result.
		1654
		1655	=for gengetinfo end kernel
		1656
		1657	=item $packed_value = $kernel->work_group_info ($device, $name)
		1658
		1659	See C<< $platform->info >> for details.
		1660
		1661	The reason this method is not called C<info> is that there already is an
		1662	C<< ->info >> method.
		1663
		1664	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetKernelWorkGroupInfo.html>
		1665
		1666	=for gengetinfo begin kernel_work_group
		1667
		1668	=item $int = $kernel->work_group_size ($device)
		1669
		1670	Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_WORK_GROUP_SIZE> and returns the result.
		1671
		1672	=item @ints = $kernel->compile_work_group_size ($device)
		1673
		1674	Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_COMPILE_WORK_GROUP_SIZE> and returns the result.
		1675
		1676	=item $ulong = $kernel->local_mem_size ($device)
		1677
		1678	Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_LOCAL_MEM_SIZE> and returns the result.
		1679
		1680	=item $int = $kernel->preferred_work_group_size_multiple ($device)
		1681
		1682	Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_PREFERRED_WORK_GROUP_SIZE_MULTIPLE> and returns the result.
		1683
		1684	=item $ulong = $kernel->private_mem_size ($device)
		1685
		1686	Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_PRIVATE_MEM_SIZE> and returns the result.
		1687
		1688	=for gengetinfo end kernel_work_group
		1689
		1690	=item $kernel->set_TYPE ($index, $value)
		1691
		1692	=item $kernel->set_char ($index, $value)
		1693
		1694	=item $kernel->set_uchar ($index, $value)
		1695
		1696	=item $kernel->set_short ($index, $value)
		1697
		1698	=item $kernel->set_ushort ($index, $value)
		1699
		1700	=item $kernel->set_int ($index, $value)
		1701
		1702	=item $kernel->set_uint ($index, $value)
		1703
		1704	=item $kernel->set_long ($index, $value)
		1705
		1706	=item $kernel->set_ulong ($index, $value)
		1707
		1708	=item $kernel->set_half ($index, $value)
		1709
		1710	=item $kernel->set_float ($index, $value)
		1711
		1712	=item $kernel->set_double ($index, $value)
		1713
		1714	=item $kernel->set_memory ($index, $value)
		1715
		1716	=item $kernel->set_buffer ($index, $value)
		1717
		1718	=item $kernel->set_image ($index, $value)
		1719
		1720	=item $kernel->set_sampler ($index, $value)
		1721
		1722	=item $kernel->set_local ($index, $value)
		1723
		1724	=item $kernel->set_event ($index, $value)
		1725
		1726	This is a family of methods to set the kernel argument with the number
		1727	C<$index> to the give C<$value>.
		1728
		1729	Chars and integers (including the half type) are specified as integers,
		1730	float and double as floating point values, memory/buffer/image must be
		1731	an object of that type or C<undef>, local-memory arguments are set by
		1732	specifying the size, and sampler and event must be objects of that type.
		1733
		1734	Note that C<set_memory> works for all memory objects (all types of buffers
		1735	and images) - the main purpose of the more specific C<set_TYPE> functions
		1736	is type checking.
		1737
		1738	Setting an argument for a kernel does NOT keep a reference to the object -
		1739	for example, if you set an argument to some image object, free the image,
		1740	and call the kernel, you will run into undefined behaviour.
		1741
		1742	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetKernelArg.html>
		1743
		1744	=back
		1745
		1746	=head2 THE OpenCL::Event CLASS
		1747
		1748	This is the superclass for all event objects (including OpenCL::UserEvent
		1749	objects).
		1750
		1751	=over 4
		1752
		1753	=item $ev->wait
		1754
		1755	Waits for the event to complete.
		1756
		1757	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>
		1758
		1759	=item $ev->cb ($exec_callback_type, $callback->($event, $event_command_exec_status))
		1760
		1761	Adds a callback to the callback stack for the given event type. There is
		1762	no way to remove a callback again.
		1763
		1764	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetEventCallback.html>
		1765
		1766	=item $packed_value = $ev->info ($name)
		1767
		1768	See C<< $platform->info >> for details.
		1769
		1770	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetEventInfo.html>
		1771
		1772	=for gengetinfo begin event
		1773
		1774	=item $queue = $event->command_queue
		1775
		1776	Calls C<clGetEventInfo> with C<CL_EVENT_COMMAND_QUEUE> and returns the result.
		1777
		1778	=item $command_type = $event->command_type
		1779
		1780	Calls C<clGetEventInfo> with C<CL_EVENT_COMMAND_TYPE> and returns the result.
		1781
		1782	=item $uint = $event->reference_count
		1783
		1784	Calls C<clGetEventInfo> with C<CL_EVENT_REFERENCE_COUNT> and returns the result.
		1785
		1786	=item $uint = $event->command_execution_status
		1787
		1788	Calls C<clGetEventInfo> with C<CL_EVENT_COMMAND_EXECUTION_STATUS> and returns the result.
		1789
		1790	=item $ctx = $event->context
		1791
		1792	Calls C<clGetEventInfo> with C<CL_EVENT_CONTEXT> and returns the result.
		1793
		1794	=for gengetinfo end event
		1795
		1796	=item $packed_value = $ev->profiling_info ($name)
		1797
		1798	See C<< $platform->info >> for details.
		1799
		1800	The reason this method is not called C<info> is that there already is an
		1801	C<< ->info >> method.
		1802
		1803	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetProfilingInfo.html>
		1804
		1805	=for gengetinfo begin profiling
		1806
		1807	=item $ulong = $event->profiling_command_queued
		1808
		1809	Calls C<clGetEventProfilingInfo> with C<CL_PROFILING_COMMAND_QUEUED> and returns the result.
		1810
		1811	=item $ulong = $event->profiling_command_submit
		1812
		1813	Calls C<clGetEventProfilingInfo> with C<CL_PROFILING_COMMAND_SUBMIT> and returns the result.
		1814
		1815	=item $ulong = $event->profiling_command_start
		1816
		1817	Calls C<clGetEventProfilingInfo> with C<CL_PROFILING_COMMAND_START> and returns the result.
		1818
		1819	=item $ulong = $event->profiling_command_end
		1820
		1821	Calls C<clGetEventProfilingInfo> with C<CL_PROFILING_COMMAND_END> and returns the result.
		1822
		1823	=for gengetinfo end profiling
		1824
		1825	=back
		1826
		1827	=head2 THE OpenCL::UserEvent CLASS
		1828
		1829	This is a subclass of OpenCL::Event.
		1830
		1831	=over 4
		1832
		1833	=item $ev->set_status ($execution_status)
		1834
		1835	Sets the execution status of the user event. Can only be called once,
		1836	either with OpenCL::COMPLETE or a negative number as status.
		1837
		1838	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetUserEventStatus.html>
		1839
		1840	=back
		1841
		1842	=cut
		1843
44	1;	1844	1;
45
46	=back
47		1845
48	=head1 AUTHOR	1846	=head1 AUTHOR
49		1847
50	Marc Lehmann <schmorp@schmorp.de>	1848	Marc Lehmann <schmorp@schmorp.de>
51	http://home.schmorp.de/	1849	http://home.schmorp.de/

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