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Revision 1.7 by root, Wed Nov 16 00:44:41 2011 UTC vs.
Revision 1.72 by root, Fri May 4 14:49:42 2012 UTC

…		…
8		8
9	=head1 DESCRIPTION	9	=head1 DESCRIPTION
10		10
11	This is an early release which might be useful, but hasn't seen much testing.	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
13	=head1 HELPFUL RESOURCES	46	=head2 HELPFUL RESOURCES
14		47
15	The OpenCL spec used to develop this module (1.2 spec was available, but	48	The OpenCL specs used to develop this module - download these and keept
16	no implementation was available to me :).	49	hema round, they are required reference material:
17		50
18	http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf	51	http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf
		52	http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf
		53	http://www.khronos.org/registry/cl/specs/opencl-1.2-extensions.pdf
19		54
20	OpenCL manpages:	55	OpenCL manpages:
21		56
22	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/	57	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/
		58	http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/
		59
		60	If you are into UML class diagrams, the following diagram might help - if
		61	not, it will be mildly confusing (also, the class hierarchy of this module
		62	is much more fine-grained):
		63
		64	http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/classDiagram.html
		65
		66	Here's a tutorial from AMD (very AMD-centric, too), not sure how useful it
		67	is, but at least it's free of charge:
		68
		69	http://developer.amd.com/zones/OpenCLZone/courses/Documents/Introduction_to_OpenCL_Programming%20Training_Guide%20%28201005%29.pdf
		70
		71	And here's NVIDIA's OpenCL Best Practises Guide:
		72
		73	http://developer.download.nvidia.com/compute/cuda/3_2/toolkit/docs/OpenCL_Best_Practices_Guide.pdf
		74
		75	=head1 BASIC WORKFLOW
		76
		77	To get something done, you basically have to do this once (refer to the
		78	examples below for actual code, this is just a high-level description):
		79
		80	Find some platform (e.g. the first one) and some device(s) (e.g. the first
		81	device of the platform), and create a context from those.
		82
		83	Create program objects from your OpenCL source code, then build (compile)
		84	the programs for each device you want to run them on.
		85
		86	Create kernel objects for all kernels you want to use (surprisingly, these
		87	are not device-specific).
		88
		89	Then, to execute stuff, you repeat these steps, possibly resuing or
		90	sharing some buffers:
		91
		92	Create some input and output buffers from your context. Set these as
		93	arguments to your kernel.
		94
		95	Enqueue buffer writes to initialise your input buffers (when not
		96	initialised at creation time).
		97
		98	Enqueue the kernel execution.
		99
		100	Enqueue buffer reads for your output buffer to read results.
23		101
24	=head1 EXAMPLES	102	=head1 EXAMPLES
25		103
26	=head2 Enumerate all devices and get contexts for them.	104	=head2 Enumerate all devices and get contexts for them.
27		105
		106	Best run this once to get a feel for the platforms and devices in your
		107	system.
		108
28	for my $platform (OpenCL::platforms) {	109	for my $platform (OpenCL::platforms) {
29	warn $platform->info (OpenCL::PLATFORM_NAME);	110	printf "platform: %s\n", $platform->name;
30	warn $platform->info (OpenCL::PLATFORM_EXTENSIONS);	111	printf "extensions: %s\n", $platform->extensions;
31	for my $device ($platform->devices) {	112	for my $device ($platform->devices) {
32	warn $device->info (OpenCL::DEVICE_NAME);	113	printf "+ device: %s\n", $device->name;
33	my $ctx = $device->context_simple;	114	my $ctx = $platform->context (undef, [$device]);
34	# do stuff	115	# do stuff
35	}	116	}
36	}	117	}
37		118
38	=head2 Get a useful context and a command queue.	119	=head2 Get a useful context and a command queue.
39		120
40	my $dev = ((OpenCL::platforms)[0]->devices)[0];	121	This is a useful boilerplate for any OpenCL program that only wants to use
41	my $ctx = $dev->context_simple;	122	one device,
42	my $queue = $ctx->command_queue_simple ($dev);	123
		124	my ($platform) = OpenCL::platforms; # find first platform
		125	my ($dev) = $platform->devices; # find first device of platform
		126	my $ctx = $platform->context (undef, [$dev]); # create context out of those
		127	my $queue = $ctx->queue ($dev); # create a command queue for the device
43		128
44	=head2 Print all supported image formats of a context.	129	=head2 Print all supported image formats of a context.
45		130
		131	Best run this once for your context, to see whats available and how to
		132	gather information.
		133
46	for my $type (OpenCL::MEM_OBJECT_IMAGE2D, OpenCL::MEM_OBJECT_IMAGE3D) {	134	for my $type (OpenCL::MEM_OBJECT_IMAGE2D, OpenCL::MEM_OBJECT_IMAGE3D) {
47	say "supported image formats for ", OpenCL::enum2str $type;	135	print "supported image formats for ", OpenCL::enum2str $type, "\n";
48		136
49	for my $f ($ctx->supported_image_formats (0, $type)) {	137	for my $f ($ctx->supported_image_formats (0, $type)) {
50	printf " %-10s %-20s\n", OpenCL::enum2str $f->[0], OpenCL::enum2str $f->[1];	138	printf " %-10s %-20s\n", OpenCL::enum2str $f->[0], OpenCL::enum2str $f->[1];
51	}	139	}
52	}	140	}
…		…
54	=head2 Create a buffer with some predefined data, read it back synchronously,	142	=head2 Create a buffer with some predefined data, read it back synchronously,
55	then asynchronously.	143	then asynchronously.
56		144
57	my $buf = $ctx->buffer_sv (OpenCL::MEM_COPY_HOST_PTR, "helmut");	145	my $buf = $ctx->buffer_sv (OpenCL::MEM_COPY_HOST_PTR, "helmut");
58		146
59	$queue->enqueue_read_buffer ($buf, 1, 1, 3, my $data);	147	$queue->read_buffer ($buf, 1, 1, 3, my $data);
60	warn $data;	148	print "$data\n";
61		149
62	my $ev = $queue->enqueue_read_buffer ($buf, 0, 1, 3, my $data);	150	my $ev = $queue->read_buffer ($buf, 0, 1, 3, my $data);
63	$ev->wait;	151	$ev->wait;
64	warn $data;	152	print "$data\n"; # prints "elm"
65		153
66	=head2 Create and build a program, then create a kernel out of one of its	154	=head2 Create and build a program, then create a kernel out of one of its
67	functions.	155	functions.
68		156
69	my $src = '	157	my $src = '
70	__kernel void	158	kernel void
71	squareit (__global float *input, __global float *output)	159	squareit (global float *input, global float *output)
72	{	160	{
73	size_t id = get_global_id (0);	161	$id = get_global_id (0);
74	output [id] = input [id] * input [id];	162	output [id] = input [id] * input [id];
75	}	163	}
76	';	164	';
77		165
78	my $prog = $ctx->program_with_source ($src);	166	my $prog = $ctx->build_program ($src);
79
80	eval { $prog->build ($dev); 1 }
81	or die $prog->build_info ($dev, OpenCL::PROGRAM_BUILD_LOG);
82
83	my $kernel = $prog->kernel ("squareit");	167	my $kernel = $prog->kernel ("squareit");
84		168
85	=head2 Create some input and output float buffers, then call squareit on them.	169	=head2 Create some input and output float buffers, then call the
		170	'squareit' kernel on them.
86		171
87	my $input = $ctx->buffer_sv (OpenCL::MEM_COPY_HOST_PTR, pack "f*", 1, 2, 3, 4.5);	172	my $input = $ctx->buffer_sv (OpenCL::MEM_COPY_HOST_PTR, pack "f*", 1, 2, 3, 4.5);
88	my $output = $ctx->buffer (0, OpenCL::SIZEOF_FLOAT * 5);	173	my $output = $ctx->buffer (0, OpenCL::SIZEOF_FLOAT * 5);
89		174
90	# set buffer	175	# set buffer
91	$kernel->set_buffer (0, $input);	176	$kernel->set_buffer (0, $input);
92	$kernel->set_buffer (1, $output);	177	$kernel->set_buffer (1, $output);
93		178
94	# execute it for all 4 numbers	179	# execute it for all 4 numbers
95	$queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);	180	$queue->nd_range_kernel ($kernel, undef, [4], undef);
96		181
97	# enqueue a synchronous read	182	# enqueue a synchronous read
98	$queue->enqueue_read_buffer ($output, 1, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);	183	$queue->read_buffer ($output, 1, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);
99		184
100	# print the results:	185	# print the results:
101	say join ", ", unpack "f*", $data;	186	printf "%s\n", join ", ", unpack "f*", $data;
102		187
103	=head2 The same enqueue operations as before, but assuming an out-of-order queue,	188	=head2 The same enqueue operations as before, but assuming an out-of-order queue,
104	showing off barriers.	189	showing off barriers.
105		190
106	# execute it for all 4 numbers	191	# execute it for all 4 numbers
107	$queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);	192	$queue->nd_range_kernel ($kernel, undef, [4], undef);
108		193
109	# enqueue a barrier to ensure in-order execution	194	# enqueue a barrier to ensure in-order execution
110	$queue->enqueue_barrier;	195	$queue->barrier;
111		196
112	# enqueue an async read	197	# enqueue an async read
113	$queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);	198	$queue->read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);
114		199
115	# wait for all requests to finish	200	# wait for all requests to finish
116	$queue->finish;	201	$queue->finish;
117		202
118	=head2 The same enqueue operations as before, but assuming an out-of-order queue,	203	=head2 The same enqueue operations as before, but assuming an out-of-order queue,
119	showing off event objects and wait lists.	204	showing off event objects and wait lists.
120		205
121	# execute it for all 4 numbers	206	# execute it for all 4 numbers
122	my $ev = $queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);	207	my $ev = $queue->nd_range_kernel ($kernel, undef, [4], undef);
123		208
124	# enqueue an async read	209	# enqueue an async read
125	$ev = $queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data, $ev);	210	$ev = $queue->read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data, $ev);
126		211
127	# wait for the last event to complete	212	# wait for the last event to complete
128	$ev->wait;	213	$ev->wait;
129		214
		215	=head2 Use the OpenGL module to share a texture between OpenCL and OpenGL and draw some julia
		216	set flight effect.
		217
		218	This is quite a long example to get you going - you can download it from
		219	L<http://cvs.schmorp.de/OpenCL/examples/juliaflight>.
		220
		221	use OpenGL ":all";
		222	use OpenCL;
		223
		224	my $S = $ARGV[0] || 256; # window/texture size, smaller is faster
		225
		226	# open a window and create a gl texture
		227	OpenGL::glpOpenWindow width => $S, height => $S;
		228	my $texid = glGenTextures_p 1;
		229	glBindTexture GL_TEXTURE_2D, $texid;
		230	glTexImage2D_c GL_TEXTURE_2D, 0, GL_RGBA8, $S, $S, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0;
		231
		232	# find and use the first opencl device that let's us get a shared opengl context
		233	my $platform;
		234	my $dev;
		235	my $ctx;
		236
		237	for (OpenCL::platforms) {
		238	$platform = $_;
		239	for ($platform->devices) {
		240	$dev = $_;
		241	$ctx = $platform->context ([OpenCL::GLX_DISPLAY_KHR, undef, OpenCL::GL_CONTEXT_KHR, undef], [$dev])
		242	and last;
		243	}
		244	}
		245
		246	$ctx
		247	or die "cannot find suitable OpenCL device\n";
		248
		249	my $queue = $ctx->queue ($dev);
		250
		251	# now attach an opencl image2d object to the opengl texture
		252	my $tex = $ctx->gl_texture2d (OpenCL::MEM_WRITE_ONLY, GL_TEXTURE_2D, 0, $texid);
		253
		254	# now the boring opencl code
		255	my $src = <<EOF;
		256	kernel void
		257	juliatunnel (write_only image2d_t img, float time)
		258	{
		259	int2 xy = (int2)(get_global_id (0), get_global_id (1));
		260	float2 p = convert_float2 (xy) / $S.f * 2.f - 1.f;
		261
		262	float2 m = (float2)(1.f, p.y) / fabs (p.x); // tunnel
		263	m.x = fabs (fmod (m.x + time * 0.05f, 4.f) - 2.f);
		264
		265	float2 z = m;
		266	float2 c = (float2)(sin (time * 0.01133f), cos (time * 0.02521f));
		267
		268	for (int i = 0; i < 25 && dot (z, z) < 4.f; ++i) // standard julia
		269	z = (float2)(z.x * z.x - z.y * z.y, 2.f * z.x * z.y) + c;
		270
		271	float3 colour = (float3)(z.x, z.y, atan2 (z.y, z.x));
		272	write_imagef (img, xy, (float4)(colour * p.x * p.x, 1.));
		273	}
		274	EOF
		275
		276	my $prog = $ctx->build_program ($src);
		277	my $kernel = $prog->kernel ("juliatunnel");
		278
		279	# program compiled, kernel ready, now draw and loop
		280
		281	for (my $time; ; ++$time) {
		282	# acquire objects from opengl
		283	$queue->acquire_gl_objects ([$tex]);
		284
		285	# configure and run our kernel
		286	$kernel->setf ("mf", $tex, $time*2); # mf = memory object, float
		287	$queue->nd_range_kernel ($kernel, undef, [$S, $S], undef);
		288
		289	# release objects to opengl again
		290	$queue->release_gl_objects ([$tex]);
		291
		292	# wait
		293	$queue->finish;
		294
		295	# now draw the texture, the defaults should be all right
		296	glTexParameterf GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST;
		297
		298	glEnable GL_TEXTURE_2D;
		299	glBegin GL_QUADS;
		300	glTexCoord2f 0, 1; glVertex3i -1, -1, -1;
		301	glTexCoord2f 0, 0; glVertex3i 1, -1, -1;
		302	glTexCoord2f 1, 0; glVertex3i 1, 1, -1;
		303	glTexCoord2f 1, 1; glVertex3i -1, 1, -1;
		304	glEnd;
		305
		306	glXSwapBuffers;
		307
		308	select undef, undef, undef, 1/60;
		309	}
		310
		311	=head2 How to modify the previous example to not rely on GL sharing.
		312
		313	For those poor souls with only a sucky CPU OpenCL implementation, you
		314	currently have to read the image into some perl scalar, and then modify a
		315	texture or use glDrawPixels or so).
		316
		317	First, when you don't need gl sharing, you can create the context much simpler:
		318
		319	$ctx = $platform->context (undef, [$dev])
		320
		321	To use a texture, you would modify the above example by creating an
		322	OpenCL::Image manually instead of deriving it from a texture:
		323
		324	my $tex = $ctx->image2d (OpenCL::MEM_WRITE_ONLY, OpenCL::RGBA, OpenCL::UNORM_INT8, $S, $S);
		325
		326	And in the draw loop, intead of acquire_gl_objects/release_gl_objects, you
		327	would read the image2d after the kernel has written it:
		328
		329	$queue->read_image ($tex, 0, 0, 0, 0, $S, $S, 1, 0, 0, my $data);
		330
		331	And then you would upload the pixel data to the texture (or use glDrawPixels):
		332
		333	glTexSubImage2D_s GL_TEXTURE_2D, 0, 0, 0, $S, $S, GL_RGBA, GL_UNSIGNED_BYTE, $data;
		334
		335	The fully modified example can be found at
		336	L<http://cvs.schmorp.de/OpenCL/examples/juliaflight-nosharing>.
		337
		338	=head2 Julia sets look soooo 80ies.
		339
		340	Then colour them differently, e.g. using orbit traps! Replace the loop and
		341	colour calculation from the previous examples by this:
		342
		343	float2 dm = (float2)(1.f, 1.f);
		344
		345	for (int i = 0; i < 25; ++i)
		346	{
		347	z = (float2)(z.x * z.x - z.y * z.y, 2.f * z.x * z.y) + c;
		348	dm = fmin (dm, (float2)(fabs (dot (z, z) - 1.f), fabs (z.x - 1.f)));
		349	}
		350
		351	float3 colour = (float3)(dm.x * dm.y, dm.x * dm.y, dm.x);
		352
		353	Also try C<-10.f> instead of C<-1.f>.
		354
130	=head1 DOCUMENTATION	355	=head1 DOCUMENTATION
131		356
132	=head2 BASIC CONVENTIONS	357	=head2 BASIC CONVENTIONS
133		358
134	This is not a 1:1 C-style translation of OpenCL to Perl - instead I	359	This is not a one-to-one C-style translation of OpenCL to Perl - instead
135	attempted to make the interface as type-safe as possible and introducing	360	I attempted to make the interface as type-safe as possible by introducing
136	object syntax where it makes sense. There are a number of important	361	object syntax where it makes sense. There are a number of important
137	differences between the OpenCL C API and this module:	362	differences between the OpenCL C API and this module:
138		363
139	=over 4	364	=over 4
140		365
141	=item * Object lifetime managament is automatic - there is no need	366	=item * Object lifetime managament is automatic - there is no need
142	to free objects explicitly (C<clReleaseXXX>), the release function	367	to free objects explicitly (C<clReleaseXXX>), the release function
143	is called automatically once all Perl references to it go away.	368	is called automatically once all Perl references to it go away.
144		369
145	=item * OpenCL uses CamelCase for function names (C<clGetPlatformInfo>),	370	=item * OpenCL uses CamelCase for function names
		371	(e.g. C<clGetPlatformIDs>, C<clGetPlatformInfo>), while this module
146	while this module uses underscores as word separator and often leaves out	372	uses underscores as word separator and often leaves out prefixes
147	prefixes (C<< $platform->info >>).	373	(C<OpenCL::platforms>, C<< $platform->info >>).
148		374
149	=item * OpenCL often specifies fixed vector function arguments as short	375	=item * OpenCL often specifies fixed vector function arguments as short
150	arrays (C<size_t origin[3]>), while this module explicitly expects the	376	arrays (C<size_t origin[3]>), while this module explicitly expects the
151	components as separate arguments-	377	components as separate arguments (C<$orig_x, $orig_y, $orig_z>) in
		378	function calls.
152		379
153	=item * Where possible, the row_pitch value is calculated from the perl	380	=item * Structures are often specified by flattening out their components
154	scalar length and need not be specified.	381	as with short vectors, and returned as arrayrefs.
155		382
156	=item * When enqueuing commands, the wait list is specified by adding	383	=item * When enqueuing commands, the wait list is specified by adding
157	extra arguments to the function - everywhere a C<$wait_events...> argument	384	extra arguments to the function - anywhere a C<$wait_events...> argument
158	is documented this can be any number of event objects.	385	is documented this can be any number of event objects. As an extsnion
		386	implemented by this module, C<undef> values will be ignored in the event
		387	list.
159		388
160	=item * When enqueuing commands, if the enqueue method is called in void	389	=item * When enqueuing commands, if the enqueue method is called in void
161	context, no event is created. In all other contexts an event is returned	390	context, no event is created. In all other contexts an event is returned
162	by the method.	391	by the method.
163		392
…		…
167		396
168	=back	397	=back
169		398
170	=head2 PERL AND OPENCL TYPES	399	=head2 PERL AND OPENCL TYPES
171		400
172	This handy(?) table lists OpenCL types and their perl and pack/unpack	401	This handy(?) table lists OpenCL types and their perl, PDL and pack/unpack
173	format equivalents:	402	format equivalents:
174		403
175	OpenCL perl pack/unpack	404	OpenCL perl PDL pack/unpack
176	char IV c	405	char IV - c
177	uchar IV C	406	uchar IV byte C
178	short IV s	407	short IV short s
179	ushort IV S	408	ushort IV ushort S
180	int IV l	409	int IV long? l
181	uint IV L	410	uint IV - L
182	long IV q	411	long IV longlong q
183	ulong IV Q	412	ulong IV - Q
184	float NV f	413	float NV float f
185	half IV S	414	half IV ushort S
186	double NV d	415	double NV double d
		416
		417	=head2 GLX SUPPORT
		418
		419	Due to the sad state that OpenGL support is in in Perl (mostly the OpenGL
		420	module, which has little to no documentation and has little to no support
		421	for glX), this module, as a special extension, treats context creation
		422	properties C<OpenCL::GLX_DISPLAY_KHR> and C<OpenCL::GL_CONTEXT_KHR>
		423	specially: If either or both of these are C<undef>, then the OpenCL
		424	module tries to dynamically resolve C<glXGetCurrentDisplay> and
		425	C<glXGetCurrentContext>, call these functions and use their return values
		426	instead.
		427
		428	For this to work, the OpenGL library must be loaded, a GLX context must
		429	have been created and be made current, and C<dlsym> must be available and
		430	capable of finding the function via C<RTLD_DEFAULT>.
		431
		432	=head2 EVENT SYSTEM
		433
		434	OpenCL can generate a number of (potentially) asynchronous events, for
		435	example, after compiling a program, to signal a context-related error or,
		436	perhaps most important, to signal completion of queued jobs (by setting
		437	callbacks on OpenCL::Event objects).
		438
		439	To facilitate this, this module maintains an event queue - each
		440	time an asynchronous event happens, it is queued, and perl will be
		441	interrupted. This is implemented via the L<Async::Interrupt> module. In
		442	addition, this module has L<AnyEvent> support, so it can seamlessly
		443	integrate itself into many event loops.
		444
		445	Since this module is a bit hard to understand, here are some case examples:
		446
		447	=head3 Don't use callbacks.
		448
		449	When your program never uses any callbacks, then there will never be any
		450	notifications you need to take care of, and therefore no need to worry
		451	about all this.
		452
		453	You can achieve a great deal by explicitly waiting for events, or using
		454	barriers and flush calls. In many programs, there is no need at all to
		455	tinker with asynchronous events.
		456
		457	=head3 Use AnyEvent
		458
		459	This module automatically registers a watcher that invokes all outstanding
		460	event callbacks when AnyEvent is initialised (and block asynchronous
		461	interruptions). Using this mode of operations is the safest and most
		462	recommended one.
		463
		464	To use this, simply use AnyEvent and this module normally, make sure you
		465	have an event loop running:
		466
		467	use Gtk2 -init;
		468	use AnyEvent;
		469
		470	# initialise AnyEvent, by creating a watcher, or:
		471	AnyEvent::detect;
		472
		473	my $e = $queue->marker;
		474	$e->cb (sub {
		475	warn "opencl is finished\n";
		476	})
		477
		478	main Gtk2;
		479
		480	Note that this module will not initialise AnyEvent for you. Before
		481	AnyEvent is initialised, the module will asynchronously interrupt perl
		482	instead. To avoid any surprises, it's best to explicitly initialise
		483	AnyEvent.
		484
		485	You can temporarily enable asynchronous interruptions (see next paragraph)
		486	by calling C<$OpenCL::INTERRUPT->unblock> and disable them again by
		487	calling C<$OpenCL::INTERRUPT->block>.
		488
		489	=head3 Let yourself be interrupted at any time
		490
		491	This mode is the default unless AnyEvent is loaded and initialised. In
		492	this mode, OpenCL asynchronously interrupts a running perl program. The
		493	emphasis is on both I<asynchronously> and I<running> here.
		494
		495	Asynchronously means that perl might execute your callbacks at any
		496	time. For example, in the following code (I<THAT YOU SHOULD NOT COPY>),
		497	the C<until> loop following the marker call will be interrupted by the
		498	callback:
		499
		500	my $e = $queue->marker;
		501	my $flag;
		502	$e->cb (sub { $flag = 1 });
		503	1 until $flag;
		504	# $flag is now 1
		505
		506	The reason why you shouldn't blindly copy the above code is that
		507	busy waiting is a really really bad thing, and really really bad for
		508	performance.
		509
		510	While at first this asynchronous business might look exciting, it can be
		511	really hard, because you need to be prepared for the callback code to be
		512	executed at any time, which limits the amount of things the callback code
		513	can do safely.
		514
		515	This can be mitigated somewhat by using C<<
		516	$OpenCL::INTERRUPT->scope_block >> (see the L<Async::Interrupt>
		517	documentation for details).
		518
		519	The other problem is that your program must be actively I<running> to be
		520	interrupted. When you calculate stuff, your program is running. When you
		521	hang in some C functions or other block execution (by calling C<sleep>,
		522	C<select>, running an event loop and so on), your program is waiting, not
		523	running.
		524
		525	One way around that would be to attach a read watcher to your event loop,
		526	listening for events on C<< $OpenCL::INTERRUPT->pipe_fileno >>, using a
		527	dummy callback (C<sub { }>) to temporarily execute some perl code.
		528
		529	That is then awfully close to using the built-in AnyEvent support above,
		530	though, so consider that one instead.
		531
		532	=head3 Be creative
		533
		534	OpenCL exports the L<Async::Interrupt> object it uses in the global
		535	variable C<$OpenCL::INTERRUPT>. You can configure it in any way you like.
		536
		537	So if you want to feel like a real pro, err, wait, if you feel no risk
		538	menas no fun, you can experiment by implementing your own mode of
		539	operations.
		540
		541	=cut
		542
		543	package OpenCL;
		544
		545	use common::sense;
		546	use Carp ();
		547	use Async::Interrupt ();
		548
		549	our $POLL_FUNC; # set by XS
		550
		551	BEGIN {
		552	our $VERSION = '0.99';
		553
		554	require XSLoader;
		555	XSLoader::load (__PACKAGE__, $VERSION);
		556
		557	@OpenCL::Platform::ISA =
		558	@OpenCL::Device::ISA =
		559	@OpenCL::Context::ISA =
		560	@OpenCL::Queue::ISA =
		561	@OpenCL::Memory::ISA =
		562	@OpenCL::Sampler::ISA =
		563	@OpenCL::Program::ISA =
		564	@OpenCL::Kernel::ISA =
		565	@OpenCL::Event::ISA = OpenCL::Object::;
		566
		567	@OpenCL::SubDevice::ISA = OpenCL::Device::;
		568
		569	@OpenCL::Buffer::ISA =
		570	@OpenCL::Image::ISA = OpenCL::Memory::;
		571
		572	@OpenCL::BufferObj::ISA = OpenCL::Buffer::;
		573
		574	@OpenCL::Image2D::ISA =
		575	@OpenCL::Image3D::ISA =
		576	@OpenCL::Image2DArray::ISA =
		577	@OpenCL::Image1D::ISA =
		578	@OpenCL::Image1DArray::ISA =
		579	@OpenCL::Image1DBuffer::ISA = OpenCL::Image::;
		580
		581	@OpenCL::UserEvent::ISA = OpenCL::Event::;
		582
		583	@OpenCL::MappedBuffer::ISA =
		584	@OpenCL::MappedImage::ISA = OpenCL::Mapped::;
		585	}
187		586
188	=head2 THE OpenCL PACKAGE	587	=head2 THE OpenCL PACKAGE
189		588
190	=over 4	589	=over 4
191		590
192	=item $int = OpenCL::errno	591	=item $int = OpenCL::errno
193		592
194	The last error returned by a function - it's only changed on errors.	593	The last error returned by a function - it's only valid after an error occured
		594	and before calling another OpenCL function.
195		595
196	=item $str = OpenCL::err2str $errval	596	=item $str = OpenCL::err2str [$errval]
197		597
198	Comverts an error value into a human readable string.	598	Converts an error value into a human readable string. IF no error value is
		599	given, then the last error will be used (as returned by OpenCL::errno).
199		600
200	=item $str = OpenCL::err2str $enum	601	=item $str = OpenCL::enum2str $enum
201		602
202	Converts most enum values (inof parameter names, image format constants,	603	Converts most enum values (of parameter names, image format constants,
203	object types, addressing and filter modes, command types etc.) into a	604	object types, addressing and filter modes, command types etc.) into a
204	human readbale string. When confronted with some random integer it can be	605	human readable string. When confronted with some random integer it can be
205	very helpful to pass it through this function to maybe get some readable	606	very helpful to pass it through this function to maybe get some readable
206	string out of it.	607	string out of it.
207		608
208	=item @platforms = OpenCL::platforms	609	=item @platforms = OpenCL::platforms
209		610
210	Returns all available OpenCL::Platform objects.	611	Returns all available OpenCL::Platform objects.
211		612
212	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetPlatformIDs.html>	613	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetPlatformIDs.html>
213		614
214	=item $ctx = OpenCL::context_from_type_simple $type = OpenCL::DEVICE_TYPE_DEFAULT	615	=item $ctx = OpenCL::context_from_type $properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $callback->($err, $pvt) = $print_stderr
215		616
216	Tries to create a context from a default device and platform - never worked for me.	617	Tries to create a context from a default device and platform type - never worked for me.
		618
		619	type: OpenCL::DEVICE_TYPE_DEFAULT, OpenCL::DEVICE_TYPE_CPU, OpenCL::DEVICE_TYPE_GPU,
		620	OpenCL::DEVICE_TYPE_ACCELERATOR, OpenCL::DEVICE_TYPE_CUSTOM, OpenCL::DEVICE_TYPE_ALL.
217		621
218	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>	622	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>
219		623
		624	=item $ctx = OpenCL::context $properties, \@devices, $callback->($err, $pvt) = $print_stderr)
		625
		626	Create a new OpenCL::Context object using the given device object(s). This
		627	function isn't implemented yet, use C<< $platform->context >> instead.
		628
		629	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContext.html>
		630
220	=item OpenCL::wait_for_events $wait_events...	631	=item OpenCL::wait_for_events $wait_events...
221		632
222	Waits for all events to complete.	633	Waits for all events to complete.
223		634
224	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>	635	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>
225		636
		637	=item OpenCL::poll
		638
		639	Checks if there are any outstanding events (see L<EVENT SYSTEM>) and
		640	invokes their callbacks.
		641
		642	=item $OpenCL::INTERRUPT
		643
		644	The L<Async::Interrupt> object used to signal asynchronous events (see
		645	L<EVENT SYSTEM>).
		646
		647	=cut
		648
		649	our $INTERRUPT = new Async::Interrupt c_cb => [$POLL_FUNC, 0];
		650
		651	&_eq_initialise ($INTERRUPT->signal_func);
		652
		653	=item $OpenCL::WATCHER
		654
		655	The L<AnyEvent> watcher object used to watch for asynchronous events (see
		656	L<EVENT SYSTEM>). This variable is C<undef> until L<AnyEvent> has been
		657	loaded I<and> initialised (e.g. by calling C<AnyEvent::detect>).
		658
		659	=cut
		660
		661	our $WATCHER;
		662
		663	sub _init_anyevent {
		664	$INTERRUPT->block;
		665	$WATCHER = AE::io ($INTERRUPT->pipe_fileno, 0, sub { $INTERRUPT->handle });
		666	}
		667
		668	if (defined $AnyEvent::MODEL) {
		669	_init_anyevent;
		670	} else {
		671	push @AnyEvent::post_detect, \&_init_anyevent;
		672	}
		673
226	=back	674	=back
227		675
		676	=head2 THE OpenCL::Object CLASS
		677
		678	This is the base class for all objects in the OpenCL module. The only
		679	method it implements is the C<id> method, which is only useful if you want
		680	to interface to OpenCL on the C level.
		681
		682	=over 4
		683
		684	=item $iv = $obj->id
		685
		686	OpenCL objects are represented by pointers or integers on the C level. If
		687	you want to interface to an OpenCL object directly on the C level, then
		688	you need this value, which is returned by this method. You should use an
		689	C<IV> type in your code and cast that to the correct type.
		690
		691	=cut
		692
		693	sub OpenCL::Object::id {
		694	ref $_[0] eq "SCALAR"
		695	? ${ $_[0] }
		696	: $_[0][0]
		697	}
		698
		699	=back
		700
228	=head2 THE OpenCL::Platform CLASS	701	=head2 THE OpenCL::Platform CLASS
229		702
230	=over 4	703	=over 4
231		704
		705	=item @devices = $platform->devices ($type = OpenCL::DEVICE_TYPE_ALL)
		706
		707	Returns a list of matching OpenCL::Device objects.
		708
		709	=item $ctx = $platform->context_from_type ($properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $callback->($err, $pvt) = $print_stderr)
		710
		711	Tries to create a context. Never worked for me, and you need devices explicitly anyway.
		712
		713	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>
		714
		715	=item $ctx = $platform->context ($properties, \@devices, $callback->($err, $pvt) = $print_stderr)
		716
		717	Create a new OpenCL::Context object using the given device object(s)- a
		718	CL_CONTEXT_PLATFORM property is supplied automatically.
		719
		720	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContext.html>
		721
232	=item $packed_value = $platform->info ($name)	722	=item $packed_value = $platform->info ($name)
233		723
234	Calls C<clGetPlatformInfo> and returns the packed, raw value - for	724	Calls C<clGetPlatformInfo> and returns the packed, raw value - for
235	strings, this will be the string, for other values you probably need to	725	strings, this will be the string (possibly including terminating \0), for
236	use the correct C<unpack>. This might get improved in the future. Hopefully.	726	other values you probably need to use the correct C<unpack>.
		727
		728	It's best to avoid this method and use one of the following convenience
		729	wrappers.
237		730
238	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetPlatformInfo.html>	731	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetPlatformInfo.html>
239		732
240	=item @devices = $platform->devices ($type = OpenCL::DEVICE_TYPE_ALL)	733	=item $platform->unload_compiler
241		734
242	Returns a list of matching OpenCL::Device objects.	735	Attempts to unload the compiler for this platform, for endless
		736	profit. Does nothing on OpenCL 1.1.
243		737
244	=item $ctx = $platform->context_from_type_simple ($type = OpenCL::DEVICE_TYPE_DEFAULT)
245
246	Tries to create a context. Never worked for me.
247
248	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>	738	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clUnloadPlatformCompiler.html>
		739
		740	=for gengetinfo begin platform
		741
		742	=item $string = $platform->profile
		743
		744	Calls C<clGetPlatformInfo> with C<OpenCL::PLATFORM_PROFILE> and returns the result.
		745
		746	=item $string = $platform->version
		747
		748	Calls C<clGetPlatformInfo> with C<OpenCL::PLATFORM_VERSION> and returns the result.
		749
		750	=item $string = $platform->name
		751
		752	Calls C<clGetPlatformInfo> with C<OpenCL::PLATFORM_NAME> and returns the result.
		753
		754	=item $string = $platform->vendor
		755
		756	Calls C<clGetPlatformInfo> with C<OpenCL::PLATFORM_VENDOR> and returns the result.
		757
		758	=item $string = $platform->extensions
		759
		760	Calls C<clGetPlatformInfo> with C<OpenCL::PLATFORM_EXTENSIONS> and returns the result.
		761
		762	=for gengetinfo end platform
249		763
250	=back	764	=back
251		765
252	=head2 THE OpenCL::Device CLASS	766	=head2 THE OpenCL::Device CLASS
253		767
…		…
257		771
258	See C<< $platform->info >> for details.	772	See C<< $platform->info >> for details.
259		773
260	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetDeviceInfo.html>	774	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetDeviceInfo.html>
261		775
262	=item $ctx = $device->context_simple	776	=item @devices = $device->sub_devices (\@properties)
263		777
264	Convenience function to create a new OpenCL::Context object.	778	Creates OpencL::SubDevice objects by partitioning an existing device.
265		779
266	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContext.html>	780	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateSubDevices.html>
		781
		782	=for gengetinfo begin device
		783
		784	=item $device_type = $device->type
		785
		786	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_TYPE> and returns the result.
		787
		788	=item $uint = $device->vendor_id
		789
		790	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_VENDOR_ID> and returns the result.
		791
		792	=item $uint = $device->max_compute_units
		793
		794	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_COMPUTE_UNITS> and returns the result.
		795
		796	=item $uint = $device->max_work_item_dimensions
		797
		798	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_WORK_ITEM_DIMENSIONS> and returns the result.
		799
		800	=item $int = $device->max_work_group_size
		801
		802	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_WORK_GROUP_SIZE> and returns the result.
		803
		804	=item @ints = $device->max_work_item_sizes
		805
		806	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_WORK_ITEM_SIZES> and returns the result.
		807
		808	=item $uint = $device->preferred_vector_width_char
		809
		810	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_CHAR> and returns the result.
		811
		812	=item $uint = $device->preferred_vector_width_short
		813
		814	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_SHORT> and returns the result.
		815
		816	=item $uint = $device->preferred_vector_width_int
		817
		818	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_INT> and returns the result.
		819
		820	=item $uint = $device->preferred_vector_width_long
		821
		822	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_LONG> and returns the result.
		823
		824	=item $uint = $device->preferred_vector_width_float
		825
		826	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT> and returns the result.
		827
		828	=item $uint = $device->preferred_vector_width_double
		829
		830	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE> and returns the result.
		831
		832	=item $uint = $device->max_clock_frequency
		833
		834	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_CLOCK_FREQUENCY> and returns the result.
		835
		836	=item $bitfield = $device->address_bits
		837
		838	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_ADDRESS_BITS> and returns the result.
		839
		840	=item $uint = $device->max_read_image_args
		841
		842	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_READ_IMAGE_ARGS> and returns the result.
		843
		844	=item $uint = $device->max_write_image_args
		845
		846	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_WRITE_IMAGE_ARGS> and returns the result.
		847
		848	=item $ulong = $device->max_mem_alloc_size
		849
		850	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_MEM_ALLOC_SIZE> and returns the result.
		851
		852	=item $int = $device->image2d_max_width
		853
		854	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE2D_MAX_WIDTH> and returns the result.
		855
		856	=item $int = $device->image2d_max_height
		857
		858	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE2D_MAX_HEIGHT> and returns the result.
		859
		860	=item $int = $device->image3d_max_width
		861
		862	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE3D_MAX_WIDTH> and returns the result.
		863
		864	=item $int = $device->image3d_max_height
		865
		866	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE3D_MAX_HEIGHT> and returns the result.
		867
		868	=item $int = $device->image3d_max_depth
		869
		870	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE3D_MAX_DEPTH> and returns the result.
		871
		872	=item $uint = $device->image_support
		873
		874	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE_SUPPORT> and returns the result.
		875
		876	=item $int = $device->max_parameter_size
		877
		878	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_PARAMETER_SIZE> and returns the result.
		879
		880	=item $uint = $device->max_samplers
		881
		882	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_SAMPLERS> and returns the result.
		883
		884	=item $uint = $device->mem_base_addr_align
		885
		886	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MEM_BASE_ADDR_ALIGN> and returns the result.
		887
		888	=item $uint = $device->min_data_type_align_size
		889
		890	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MIN_DATA_TYPE_ALIGN_SIZE> and returns the result.
		891
		892	=item $device_fp_config = $device->single_fp_config
		893
		894	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_SINGLE_FP_CONFIG> and returns the result.
		895
		896	=item $device_mem_cache_type = $device->global_mem_cache_type
		897
		898	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_GLOBAL_MEM_CACHE_TYPE> and returns the result.
		899
		900	=item $uint = $device->global_mem_cacheline_size
		901
		902	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_GLOBAL_MEM_CACHELINE_SIZE> and returns the result.
		903
		904	=item $ulong = $device->global_mem_cache_size
		905
		906	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_GLOBAL_MEM_CACHE_SIZE> and returns the result.
		907
		908	=item $ulong = $device->global_mem_size
		909
		910	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_GLOBAL_MEM_SIZE> and returns the result.
		911
		912	=item $ulong = $device->max_constant_buffer_size
		913
		914	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_CONSTANT_BUFFER_SIZE> and returns the result.
		915
		916	=item $uint = $device->max_constant_args
		917
		918	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_CONSTANT_ARGS> and returns the result.
		919
		920	=item $device_local_mem_type = $device->local_mem_type
		921
		922	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_LOCAL_MEM_TYPE> and returns the result.
		923
		924	=item $ulong = $device->local_mem_size
		925
		926	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_LOCAL_MEM_SIZE> and returns the result.
		927
		928	=item $boolean = $device->error_correction_support
		929
		930	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_ERROR_CORRECTION_SUPPORT> and returns the result.
		931
		932	=item $int = $device->profiling_timer_resolution
		933
		934	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PROFILING_TIMER_RESOLUTION> and returns the result.
		935
		936	=item $boolean = $device->endian_little
		937
		938	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_ENDIAN_LITTLE> and returns the result.
		939
		940	=item $boolean = $device->available
		941
		942	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_AVAILABLE> and returns the result.
		943
		944	=item $boolean = $device->compiler_available
		945
		946	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_COMPILER_AVAILABLE> and returns the result.
		947
		948	=item $device_exec_capabilities = $device->execution_capabilities
		949
		950	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_EXECUTION_CAPABILITIES> and returns the result.
		951
		952	=item $command_queue_properties = $device->properties
		953
		954	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_QUEUE_PROPERTIES> and returns the result.
		955
		956	=item $ = $device->platform
		957
		958	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PLATFORM> and returns the result.
		959
		960	=item $string = $device->name
		961
		962	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NAME> and returns the result.
		963
		964	=item $string = $device->vendor
		965
		966	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_VENDOR> and returns the result.
		967
		968	=item $string = $device->driver_version
		969
		970	Calls C<clGetDeviceInfo> with C<OpenCL::DRIVER_VERSION> and returns the result.
		971
		972	=item $string = $device->profile
		973
		974	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PROFILE> and returns the result.
		975
		976	=item $string = $device->version
		977
		978	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_VERSION> and returns the result.
		979
		980	=item $string = $device->extensions
		981
		982	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_EXTENSIONS> and returns the result.
		983
		984	=item $uint = $device->preferred_vector_width_half
		985
		986	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_HALF> and returns the result.
		987
		988	=item $uint = $device->native_vector_width_char
		989
		990	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_CHAR> and returns the result.
		991
		992	=item $uint = $device->native_vector_width_short
		993
		994	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_SHORT> and returns the result.
		995
		996	=item $uint = $device->native_vector_width_int
		997
		998	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_INT> and returns the result.
		999
		1000	=item $uint = $device->native_vector_width_long
		1001
		1002	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_LONG> and returns the result.
		1003
		1004	=item $uint = $device->native_vector_width_float
		1005
		1006	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_FLOAT> and returns the result.
		1007
		1008	=item $uint = $device->native_vector_width_double
		1009
		1010	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_DOUBLE> and returns the result.
		1011
		1012	=item $uint = $device->native_vector_width_half
		1013
		1014	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_HALF> and returns the result.
		1015
		1016	=item $device_fp_config = $device->double_fp_config
		1017
		1018	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_DOUBLE_FP_CONFIG> and returns the result.
		1019
		1020	=item $device_fp_config = $device->half_fp_config
		1021
		1022	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_HALF_FP_CONFIG> and returns the result.
		1023
		1024	=item $boolean = $device->host_unified_memory
		1025
		1026	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_HOST_UNIFIED_MEMORY> and returns the result.
		1027
		1028	=item $device = $device->parent_device_ext
		1029
		1030	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PARENT_DEVICE_EXT> and returns the result.
		1031
		1032	=item @device_partition_property_exts = $device->partition_types_ext
		1033
		1034	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PARTITION_TYPES_EXT> and returns the result.
		1035
		1036	=item @device_partition_property_exts = $device->affinity_domains_ext
		1037
		1038	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_AFFINITY_DOMAINS_EXT> and returns the result.
		1039
		1040	=item $uint = $device->reference_count_ext
		1041
		1042	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_REFERENCE_COUNT_EXT> and returns the result.
		1043
		1044	=item @device_partition_property_exts = $device->partition_style_ext
		1045
		1046	Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PARTITION_STYLE_EXT> and returns the result.
		1047
		1048	=for gengetinfo end device
267		1049
268	=back	1050	=back
269		1051
270	=head2 THE OpenCL::Context CLASS	1052	=head2 THE OpenCL::Context CLASS
271		1053
		1054	An OpenCL::Context is basically a container, or manager, for a number of
		1055	devices of a platform. It is used to create all sorts of secondary objects
		1056	such as buffers, queues, programs and so on.
		1057
		1058	All context creation functions and methods take a list of properties
		1059	(type-value pairs). All property values can be specified as integers -
		1060	some additionally support other types:
		1061
272	=over 4	1062	=over 4
273		1063
274	=item $packed_value = $ctx->info ($name)	1064	=item OpenCL::CONTEXT_PLATFORM
275		1065
276	See C<< $platform->info >> for details.	1066	Also accepts OpenCL::Platform objects.
277		1067
278	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetContextInfo.html>	1068	=item OpenCL::GLX_DISPLAY_KHR
279		1069
280	=item $queue = $ctx->command_queue_simple ($device)	1070	Also accepts C<undef>, in which case a deep and troubling hack is engaged
		1071	to find the current glx display (see L<GLX SUPPORT>).
281		1072
		1073	=item OpenCL::GL_CONTEXT_KHR
		1074
		1075	Also accepts C<undef>, in which case a deep and troubling hack is engaged
		1076	to find the current glx context (see L<GLX SUPPORT>).
		1077
		1078	=back
		1079
		1080	=over 4
		1081
		1082	=item $prog = $ctx->build_program ($program, $options = "")
		1083
		1084	This convenience function tries to build the program on all devices in
		1085	the context. If the build fails, then the function will C<croak> with the
		1086	build log. Otherwise ti returns the program object.
		1087
		1088	The C<$program> can either be a C<OpenCL::Program> object or a string
		1089	containing the program. In the latter case, a program objetc will be
		1090	created automatically.
		1091
		1092	=cut
		1093
		1094	sub OpenCL::Context::build_program {
		1095	my ($self, $prog, $options) = @_;
		1096
		1097	$prog = $self->program_with_source ($prog)
		1098	unless ref $prog;
		1099
		1100	eval { $prog->build (undef, $options); 1 }
		1101	or errno == BUILD_PROGRAM_FAILURE
		1102	or errno == INVALID_BINARY # workaround nvidia bug
		1103	or Carp::croak "OpenCL::Context->build_program: " . err2str;
		1104
		1105	# we check status for all devices
		1106	for my $dev ($self->devices) {
		1107	$prog->build_status ($dev) == BUILD_SUCCESS
		1108	or Carp::croak "Building OpenCL program for device '" . $dev->name . "' failed:\n"
		1109	. $prog->build_log ($dev);
		1110	}
		1111
		1112	$prog
		1113	}
		1114
		1115	=item $queue = $ctx->queue ($device, $properties)
		1116
282	Convenience function to create a new OpenCL::Queue object from the context and the given device.	1117	Create a new OpenCL::Queue object from the context and the given device.
283		1118
284	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateCommandQueue.html>	1119	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateCommandQueue.html>
285		1120
		1121	Example: create an out-of-order queue.
		1122
		1123	$queue = $ctx->queue ($device, OpenCL::QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE);
		1124
286	=item $ev = $ctx->user_event	1125	=item $ev = $ctx->user_event
287		1126
288	Creates a new OpenCL::UserEvent object.	1127	Creates a new OpenCL::UserEvent object.
289		1128
290	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateUserEvent.html>	1129	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateUserEvent.html>
291		1130
292	=item $buf = $ctx->buffer ($flags, $len)	1131	=item $buf = $ctx->buffer ($flags, $len)
293		1132
294	Creates a new OpenCL::Buffer object with the given flags and octet-size.	1133	Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object with the
		1134	given flags and octet-size.
		1135
		1136	flags: OpenCL::MEM_READ_WRITE, OpenCL::MEM_WRITE_ONLY, OpenCL::MEM_READ_ONLY,
		1137	OpenCL::MEM_USE_HOST_PTR, OpenCL::MEM_ALLOC_HOST_PTR, OpenCL::MEM_COPY_HOST_PTR,
		1138	OpenCL::MEM_HOST_WRITE_ONLY, OpenCL::MEM_HOST_READ_ONLY, OpenCL::MEM_HOST_NO_ACCESS.
295		1139
296	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateBuffer.html>	1140	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateBuffer.html>
297		1141
298	=item $buf = $ctx->buffer_sv ($flags, $data)	1142	=item $buf = $ctx->buffer_sv ($flags, $data)
299		1143
300	Creates a new OpenCL::Buffer object and initialise it with the given data values.	1144	Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object and
		1145	initialise it with the given data values.
301		1146
		1147	=item $img = $ctx->image ($self, $flags, $channel_order, $channel_type, $type, $width, $height, $depth = 0, $array_size = 0, $row_pitch = 0, $slice_pitch = 0, $num_mip_level = 0, $num_samples = 0, $*data = &PL_sv_undef)
		1148
		1149	Creates a new OpenCL::Image object and optionally initialises it with
		1150	the given data values.
		1151
		1152	channel_order: OpenCL::R, OpenCL::A, OpenCL::RG, OpenCL::RA, OpenCL::RGB,
		1153	OpenCL::RGBA, OpenCL::BGRA, OpenCL::ARGB, OpenCL::INTENSITY, OpenCL::LUMINANCE,
		1154	OpenCL::Rx, OpenCL::RGx, OpenCL::RGBx.
		1155
		1156	channel_type: OpenCL::SNORM_INT8, OpenCL::SNORM_INT16, OpenCL::UNORM_INT8,
		1157	OpenCL::UNORM_INT16, OpenCL::UNORM_SHORT_565, OpenCL::UNORM_SHORT_555,
		1158	OpenCL::UNORM_INT_101010, OpenCL::SIGNED_INT8, OpenCL::SIGNED_INT16,
		1159	OpenCL::SIGNED_INT32, OpenCL::UNSIGNED_INT8, OpenCL::UNSIGNED_INT16,
		1160	OpenCL::UNSIGNED_INT32, OpenCL::HALF_FLOAT, OpenCL::FLOAT.
		1161
		1162
		1163	type: OpenCL::MEM_OBJECT_BUFFER, OpenCL::MEM_OBJECT_IMAGE2D,
		1164	OpenCL::MEM_OBJECT_IMAGE3D, OpenCL::MEM_OBJECT_IMAGE2D_ARRAY,
		1165	OpenCL::MEM_OBJECT_IMAGE1D, OpenCL::MEM_OBJECT_IMAGE1D_ARRAY,
		1166	OpenCL::MEM_OBJECT_IMAGE1D_BUFFER.
		1167
		1168	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateImage.html>
		1169
302	=item $img = $ctx->image2d ($flags, $channel_order, $channel_type, $width, $height, $data)	1170	=item $img = $ctx->image2d ($flags, $channel_order, $channel_type, $width, $height, $row_pitch = 0, $data = undef)
303		1171
304	Creates a new OpenCL::Image2D object and optionally initialises it with the given data values.	1172	Creates a new OpenCL::Image2D object and optionally initialises it with
		1173	the given data values.
305		1174
306	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateImage2D.html>	1175	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateImage2D.html>
307		1176
308	=item $img = $ctx->image3d ($flags, $channel_order, $channel_type, $width, $height, $depth, $slice_pitch, $data)	1177	=item $img = $ctx->image3d ($flags, $channel_order, $channel_type, $width, $height, $depth, $row_pitch = 0, $slice_pitch = 0, $data = undef)
309		1178
310	Creates a new OpenCL::Image3D object and optionally initialises it with the given data values.	1179	Creates a new OpenCL::Image3D object and optionally initialises it with
		1180	the given data values.
311		1181
312	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateImage3D.html>	1182	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateImage3D.html>
		1183
		1184	=item $buffer = $ctx->gl_buffer ($flags, $bufobj)
		1185
		1186	Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object that refers to the given
		1187	OpenGL buffer object.
		1188
		1189	flags: OpenCL::MEM_READ_WRITE, OpenCL::MEM_READ_ONLY, OpenCL::MEM_WRITE_ONLY.
		1190
		1191	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLBuffer.html
		1192
		1193	=item $img = $ctx->gl_texture ($flags, $target, $miplevel, $texture)
		1194
		1195	Creates a new OpenCL::Image object that refers to the given OpenGL
		1196	texture object or buffer.
		1197
		1198	target: GL_TEXTURE_1D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_BUFFER,
		1199	GL_TEXTURE_2D, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_3D,
		1200	GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
		1201	GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
		1202	GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
		1203	GL_TEXTURE_RECTANGLE/GL_TEXTURE_RECTANGLE_ARB.
		1204
		1205	http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateFromGLTexture.html
		1206
		1207	=item $img = $ctx->gl_texture2d ($flags, $target, $miplevel, $texture)
		1208
		1209	Creates a new OpenCL::Image2D object that refers to the given OpenGL
		1210	2D texture object.
		1211
		1212	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLTexture2D.html
		1213
		1214	=item $img = $ctx->gl_texture3d ($flags, $target, $miplevel, $texture)
		1215
		1216	Creates a new OpenCL::Image3D object that refers to the given OpenGL
		1217	3D texture object.
		1218
		1219	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLTexture3D.html
		1220
		1221	=item $ctx->gl_renderbuffer ($flags, $renderbuffer)
		1222
		1223	Creates a new OpenCL::Image2D object that refers to the given OpenGL
		1224	render buffer.
		1225
		1226	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLRenderbuffer.html
313		1227
314	=item @formats = $ctx->supported_image_formats ($flags, $image_type)	1228	=item @formats = $ctx->supported_image_formats ($flags, $image_type)
315		1229
316	Returns a list of matching image formats - each format is an arrayref with	1230	Returns a list of matching image formats - each format is an arrayref with
317	two values, $channel_order and $channel_type, in it.	1231	two values, $channel_order and $channel_type, in it.
…		…
320		1234
321	=item $sampler = $ctx->sampler ($normalized_coords, $addressing_mode, $filter_mode)	1235	=item $sampler = $ctx->sampler ($normalized_coords, $addressing_mode, $filter_mode)
322		1236
323	Creates a new OpenCL::Sampler object.	1237	Creates a new OpenCL::Sampler object.
324		1238
		1239	addressing_mode: OpenCL::ADDRESS_NONE, OpenCL::ADDRESS_CLAMP_TO_EDGE,
		1240	OpenCL::ADDRESS_CLAMP, OpenCL::ADDRESS_REPEAT, OpenCL::ADDRESS_MIRRORED_REPEAT.
		1241
		1242	filter_mode: OpenCL::FILTER_NEAREST, OpenCL::FILTER_LINEAR.
		1243
325	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateSampler.html>	1244	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateSampler.html>
326		1245
327	=item $program = $ctx->program_with_source ($string)	1246	=item $program = $ctx->program_with_source ($string)
328		1247
329	Creates a new OpenCL::Program object from the given source code.	1248	Creates a new OpenCL::Program object from the given source code.
330		1249
331	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateProgramWithSource.html>	1250	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateProgramWithSource.html>
332		1251
		1252	=item ($program, \@status) = $ctx->program_with_binary (\@devices, \@binaries)
		1253
		1254	Creates a new OpenCL::Program object from the given binaries.
		1255
		1256	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateProgramWithBinary.html>
		1257
		1258	Example: clone an existing program object that contains a successfully
		1259	compiled program, no matter how useless this is.
		1260
		1261	my $clone = $ctx->program_with_binary ([$prog->devices], [$prog->binaries]);
		1262
		1263	=item $program = $ctx->program_with_built_in_kernels (\@devices, $kernel_names)
		1264
		1265	Creates a new OpenCL::Program object from the given built-in kernel names.
		1266
		1267	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateProgramWithBuiltInKernels.html>
		1268
		1269	=item $packed_value = $ctx->info ($name)
		1270
		1271	See C<< $platform->info >> for details.
		1272
		1273	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetContextInfo.html>
		1274
		1275	=for gengetinfo begin context
		1276
		1277	=item $uint = $context->reference_count
		1278
		1279	Calls C<clGetContextInfo> with C<OpenCL::CONTEXT_REFERENCE_COUNT> and returns the result.
		1280
		1281	=item @devices = $context->devices
		1282
		1283	Calls C<clGetContextInfo> with C<OpenCL::CONTEXT_DEVICES> and returns the result.
		1284
		1285	=item @property_ints = $context->properties
		1286
		1287	Calls C<clGetContextInfo> with C<OpenCL::CONTEXT_PROPERTIES> and returns the result.
		1288
		1289	=item $uint = $context->num_devices
		1290
		1291	Calls C<clGetContextInfo> with C<OpenCL::CONTEXT_NUM_DEVICES> and returns the result.
		1292
		1293	=for gengetinfo end context
		1294
333	=back	1295	=back
334		1296
335	=head2 THE OpenCL::Queue CLASS	1297	=head2 THE OpenCL::Queue CLASS
336		1298
337	An OpenCL::Queue represents an execution queue for OpenCL. You execute	1299	An OpenCL::Queue represents an execution queue for OpenCL. You execute
338	requests by calling their respective C<enqueue_xxx> method and waitinf for	1300	requests by calling their respective method and waiting for it to complete
339	it to complete in some way.	1301	in some way.
340		1302
341	All the enqueue methods return an event object that can be used to wait	1303	Most methods that enqueue some request return an event object that can
342	for completion, unless the method is called in void context, in which case	1304	be used to wait for completion (optionally using a callback), unless
343	no event object is created.	1305	the method is called in void context, in which case no event object is
		1306	created.
344		1307
345	They also allow you to specify any number of other event objects that this	1308	They also allow you to specify any number of other event objects that this
346	request has to wait for before it starts executing, by simply passing the	1309	request has to wait for before it starts executing, by simply passing the
347	event objects as extra parameters to the enqueue methods.	1310	event objects as extra parameters to the enqueue methods. To simplify
		1311	program design, this module ignores any C<undef> values in the list of
		1312	events. This makes it possible to code operations such as this, without
		1313	having to put a valid event object into C<$event> first:
		1314
		1315	$event = $queue->xxx (..., $event);
348		1316
349	Queues execute in-order by default, without any parallelism, so in most	1317	Queues execute in-order by default, without any parallelism, so in most
350	cases (i.e. you use only one queue) it's not necessary to wait for or	1318	cases (i.e. you use only one queue) it's not necessary to wait for or
351	create event objects.	1319	create event objects, althoguh an our of order queue is often a bit
		1320	faster.
352		1321
353	=over 4	1322	=over 4
354		1323
355	=item $packed_value = $ctx->info ($name)
356
357	See C<< $platform->info >> for details.
358
359	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetCommandQueueInfo.html>
360
361	=item $ev = $queue->enqueue_read_buffer ($buffer, $blocking, $offset, $len, $data, $wait_events...)	1324	=item $ev = $queue->read_buffer ($buffer, $blocking, $offset, $len, $data, $wait_events...)
362		1325
363	Reads data from buffer into the given string.	1326	Reads data from buffer into the given string.
364		1327
365	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBuffer.html>	1328	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBuffer.html>
366		1329
367	=item $ev = $queue->enqueue_write_buffer ($buffer, $blocking, $offset, $data, $wait_events...)	1330	=item $ev = $queue->write_buffer ($buffer, $blocking, $offset, $data, $wait_events...)
368		1331
369	Writes data to buffer from the given string.	1332	Writes data to buffer from the given string.
370		1333
371	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBuffer.html>	1334	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBuffer.html>
372		1335
373	=item $ev = $queue->enqueue_copy_buffer ($src, $dst, $src_offset, $dst_offset, $len, $wait_events...)	1336	=item $ev = $queue->copy_buffer ($src, $dst, $src_offset, $dst_offset, $len, $wait_events...)
374		1337
375	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBuffer.html>	1338	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBuffer.html>
376		1339
		1340	=item $ev = $queue->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...)
		1341
		1342	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBufferRect.html
		1343
		1344	=item $ev = $queue->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...)
		1345
		1346	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBufferRect.html
		1347
		1348	=item $ev = $queue->copy_buffer_to_image ($src_buffer, $dst_image, $src_offset, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)
		1349
		1350	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferToImage.html>
		1351
377	=item $ev = $queue->enqueue_read_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)	1352	=item $ev = $queue->read_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)
		1353
		1354	C<$row_pitch> (and C<$slice_pitch>) can be C<0>, in which case the OpenCL
		1355	module uses the image width (and height) to supply default values.
378		1356
379	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadImage.html>	1357	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadImage.html>
380		1358
381	=item $ev = $queue->enqueue_write_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $data, $wait_events...)	1359	=item $ev = $queue->write_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)
382		1360
		1361	C<$row_pitch> (and C<$slice_pitch>) can be C<0>, in which case the OpenCL
		1362	module uses the image width (and height) to supply default values.
383	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteImage.html>	1363	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteImage.html>
384		1364
		1365	=item $ev = $queue->copy_image ($src_image, $dst_image, $src_x, $src_y, $src_z, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)
		1366
		1367	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImage.html>
		1368
		1369	=item $ev = $queue->copy_image_to_buffer ($src_image, $dst_image, $src_x, $src_y, $src_z, $width, $height, $depth, $dst_offset, $wait_events...)
		1370
		1371	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImageToBuffer.html>
		1372
385	=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, 4dst_row_pitch, $dst_slice_pitch, $ait_event...)	1373	=item $ev = $queue->copy_buffer_rect ($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...)
386		1374
387	Yeah.	1375	Yeah.
388		1376
389	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferRect.html>
390
391	=item $ev = $queue->enqueue_copy_buffer_to_image (OpenCL::Buffer src, OpenCL::Image dst, size_t src_offset, size_t dst_x, size_t dst_y, size_t dst_z, size_t width, size_t height, size_t depth, ...)
392
393	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferToImage.html>.	1377	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferToImage.html>.
394		1378
395	=item $ev = $queue->enqueue_copy_image (OpenCL::Image src, OpenCL::Buffer dst, size_t src_x, size_t src_y, size_t src_z, size_t dst_x, size_t dst_y, size_t dst_z, size_t width, size_t height, size_t depth, ...)	1379	=item $ev = $queue->fill_buffer ($mem, $pattern, $offset, $size, ...)
396		1380
		1381	Fills the given buffer object with repeated applications of C<$pattern>,
		1382	starting at C<$offset> for C<$size> octets.
		1383
		1384	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueFillBuffer.html>
		1385
		1386	=item $ev = $queue->fill_image ($img, $r, $g, $b, $a, $x, $y, $z, $width, $height, $depth, ...)
		1387
		1388	Fills the given image area with the given rgba colour components. The
		1389	components are normally floating point values between C<0> and C<1>,
		1390	except when the image channel data type is a signe dor unsigned
		1391	unnormalised format, in which case the range is determined by the format.
		1392
397	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImage.html>	1393	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueFillImage.html>
398		1394
399	=item $ev = $queue->enqueue_copy_image_to_buffer (OpenCL::Image src, OpenCL::Buffer dst, size_t src_x, size_t src_y, size_t src_z, size_t width, size_t height, size_t depth, size_t dst_offset, ...)
400
401	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImageToBuffer.html>
402
403	=item $ev = $queue->enqueue_task ($kernel, $wait_events...)	1395	=item $ev = $queue->task ($kernel, $wait_events...)
404		1396
405	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueTask.html>	1397	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueTask.html>
406		1398
407	=item $ev = $queue->enqueue_nd_range_kernel ($kernel, @$global_work_offset, @$global_work_size, @$local_work_size, $wait_events...)	1399	=item $ev = $queue->nd_range_kernel ($kernel, \@global_work_offset, \@global_work_size, \@local_work_size, $wait_events...)
408		1400
409	Enqueues a kernel execution.	1401	Enqueues a kernel execution.
410		1402
411	@$global_work_size must be specified as a reference to an array of	1403	\@global_work_size must be specified as a reference to an array of
412	integers specifying the work sizes (element counts).	1404	integers specifying the work sizes (element counts).
413		1405
414	@$global_work_offset must be either C<undef> (in which case all offsets	1406	\@global_work_offset must be either C<undef> (in which case all offsets
415	are C<0>), or a reference to an array of work offsets, with the same number	1407	are C<0>), or a reference to an array of work offsets, with the same number
416	of elements as @$global_work_size.	1408	of elements as \@global_work_size.
417		1409
418	@$local_work_size must be either C<undef> (in which case the	1410	\@local_work_size must be either C<undef> (in which case the
419	implementation is supposed to choose good local work sizes), or a	1411	implementation is supposed to choose good local work sizes), or a
420	reference to an array of local work sizes, with the same number of	1412	reference to an array of local work sizes, with the same number of
421	elements as @$global_work_size.	1413	elements as \@global_work_size.
422		1414
423	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueNDRangeKernel.html>	1415	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueNDRangeKernel.html>
424		1416
425	=item $ev = $queue->enqueue_marker	1417	=item $ev = $queue->migrate_mem_objects (\@mem_objects, $flags, $wait_events...)
426		1418
		1419	Migrates a number of OpenCL::Memory objects to or from the device.
		1420
		1421	flags: OpenCL::MIGRATE_MEM_OBJECT_HOST, OpenCL::MIGRATE_MEM_OBJECT_CONTENT_UNDEFINED
		1422
		1423	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueMigrateMemObjects.html>
		1424
		1425	=item $ev = $queue->acquire_gl_objects ([object, ...], $wait_events...)
		1426
		1427	Enqueues a list (an array-ref of OpenCL::Memory objects) to be acquired
		1428	for subsequent OpenCL usage.
		1429
427	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueMarker.html>	1430	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueAcquireGLObjects.html>
428		1431
		1432	=item $ev = $queue->release_gl_objects ([object, ...], $wait_events...)
		1433
		1434	Enqueues a list (an array-ref of OpenCL::Memory objects) to be released
		1435	for subsequent OpenGL usage.
		1436
		1437	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReleaseGLObjects.html>
		1438
429	=item $ev = $queue->enqueue_wait_for_events ($wait_events...)	1439	=item $ev = $queue->wait_for_events ($wait_events...)
430		1440
431	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWaitForEvents.html>	1441	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWaitForEvents.html>
432		1442
433	=item $queue->enqueue_barrier	1443	=item $ev = $queue->marker ($wait_events...)
434		1444
		1445	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueMarkerWithWaitList.html>
		1446
		1447	=item $ev = $queue->barrier ($wait_events...)
		1448
435	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueBarrier.html>	1449	L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueBarrierWithWaitList.html>
436		1450
437	=item $queue->flush	1451	=item $queue->flush
438		1452
439	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clFlush.html>	1453	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clFlush.html>
440		1454
441	=item $queue->finish	1455	=item $queue->finish
442		1456
443	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clFinish.html>	1457	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clFinish.html>
444		1458
		1459	=item $packed_value = $queue->info ($name)
		1460
		1461	See C<< $platform->info >> for details.
		1462
		1463	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetCommandQueueInfo.html>
		1464
		1465	=for gengetinfo begin command_queue
		1466
		1467	=item $ctx = $command_queue->context
		1468
		1469	Calls C<clGetCommandQueueInfo> with C<OpenCL::QUEUE_CONTEXT> and returns the result.
		1470
		1471	=item $device = $command_queue->device
		1472
		1473	Calls C<clGetCommandQueueInfo> with C<OpenCL::QUEUE_DEVICE> and returns the result.
		1474
		1475	=item $uint = $command_queue->reference_count
		1476
		1477	Calls C<clGetCommandQueueInfo> with C<OpenCL::QUEUE_REFERENCE_COUNT> and returns the result.
		1478
		1479	=item $command_queue_properties = $command_queue->properties
		1480
		1481	Calls C<clGetCommandQueueInfo> with C<OpenCL::QUEUE_PROPERTIES> and returns the result.
		1482
		1483	=for gengetinfo end command_queue
		1484
445	=back	1485	=back
446		1486
		1487	=head3 MEMORY MAPPED BUFFERS
		1488
		1489	OpenCL allows you to map buffers and images to host memory (read: perl
		1490	scalars). This is done much like reading or copying a buffer, by enqueuing
		1491	a map or unmap operation on the command queue.
		1492
		1493	The map operations return an C<OpenCL::Mapped> object - see L<THE
		1494	OpenCL::Mapped CLASS> section for details on what to do with these
		1495	objects.
		1496
		1497	The object will be unmapped automatically when the mapped object is
		1498	destroyed (you can use a barrier to make sure the unmap has finished,
		1499	before using the buffer in a kernel), but you can also enqueue an unmap
		1500	operation manually.
		1501
		1502	=over 4
		1503
		1504	=item $mapped_buffer = $queue->map_buffer ($buf, $blocking=1, $map_flags=OpenCL::MAP_READ|OpenCL::MAP_WRITE, $offset=0, $size=undef, $wait_events...)
		1505
		1506	Maps the given buffer into host memory and returns an
		1507	C<OpenCL::MappedBuffer> object. If C<$size> is specified as undef, then
		1508	the map will extend to the end of the buffer.
		1509
		1510	map_flags: OpenCL::MAP_READ, OpenCL::MAP_WRITE, OpenCL::MAP_WRITE_INVALIDATE_REGION.
		1511
		1512	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueMapBuffer.html>
		1513
		1514	Example: map the buffer $buf fully and replace the first 4 bytes by "abcd", then unmap.
		1515
		1516	{
		1517	my $mapped = $queue->map_buffer ($buf, 1, OpenCL::MAP_WRITE);
		1518	substr $$mapped, 0, 4, "abcd";
		1519	} # asynchronously unmap because $mapped is destroyed
		1520
		1521	=item $mapped_image = $queue->map_image ($img, $blocking=1, $map_flags=OpenCL::MAP_READ|OpenCL::MAP_WRITE, $x=0, $y=0, $z=0, $width=undef, $height=undef, $depth=undef, $wait_events...)
		1522
		1523	Maps the given image area into host memory and return an
		1524	C<OpenCL::MappedImage> object.
		1525
		1526	If any of C<$width>, C<$height> and/or C<$depth> are C<undef> then they
		1527	will be replaced by the maximum possible value.
		1528
		1529	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueMapImage.html>
		1530
		1531	Example: map an image (with OpenCL::UNSIGNED_INT8 channel type) and set
		1532	the first channel of the leftmost column to 5, then explicitly unmap
		1533	it. You are not necessarily meant to do it this way, this example just
		1534	shows you the accessors to use :)
		1535
		1536	my $mapped = $queue->map_image ($image, 1, OpenCL::MAP_WRITE);
		1537
		1538	$mapped->set ($_ * $mapped->row_pitch, pack "C", 5)
		1539	for 0..$image->height;
		1540
		1541	$mapped->unmap;.
		1542	$mapped->wait; # only needed for out of order queues normally
		1543
		1544	=item $ev = $queue->unmap ($mapped, $wait_events...)
		1545
		1546	Unmaps the data from host memory. You must not call any methods that
		1547	modify the data, or modify the data scalar directly, after calling this
		1548	method.
		1549
		1550	The mapped event object will always be passed as part of the
		1551	$wait_events. The mapped event object will be replaced by the new event
		1552	object that this request creates.
		1553
		1554	=back
		1555
447	=head2 THE OpenCL::Memory CLASS	1556	=head2 THE OpenCL::Memory CLASS
448		1557
449	This the superclass of all memory objects - OpenCL::Buffer, OpenCL::Image,	1558	This the superclass of all memory objects - OpenCL::Buffer, OpenCL::Image,
450	OpenCL::Image2D and OpenCL::Image3D. The subclasses of this class	1559	OpenCL::Image2D and OpenCL::Image3D.
451	currently only exist to allow type-checking.
452		1560
453	=over 4	1561	=over 4
454		1562
455	=item $packed_value = $memory->info ($name)	1563	=item $packed_value = $memory->info ($name)
456		1564
457	See C<< $platform->info >> for details.	1565	See C<< $platform->info >> for details.
458		1566
459	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetMemObjectInfo.html>	1567	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetMemObjectInfo.html>
460		1568
		1569	=for gengetinfo begin mem
		1570
		1571	=item $mem_object_type = $mem->type
		1572
		1573	Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_TYPE> and returns the result.
		1574
		1575	=item $mem_flags = $mem->flags
		1576
		1577	Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_FLAGS> and returns the result.
		1578
		1579	=item $int = $mem->size
		1580
		1581	Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_SIZE> and returns the result.
		1582
		1583	=item $ptr_value = $mem->host_ptr
		1584
		1585	Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_HOST_PTR> and returns the result.
		1586
		1587	=item $uint = $mem->map_count
		1588
		1589	Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_MAP_COUNT> and returns the result.
		1590
		1591	=item $uint = $mem->reference_count
		1592
		1593	Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_REFERENCE_COUNT> and returns the result.
		1594
		1595	=item $ctx = $mem->context
		1596
		1597	Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_CONTEXT> and returns the result.
		1598
		1599	=item $mem = $mem->associated_memobject
		1600
		1601	Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_ASSOCIATED_MEMOBJECT> and returns the result.
		1602
		1603	=item $int = $mem->offset
		1604
		1605	Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_OFFSET> and returns the result.
		1606
		1607	=for gengetinfo end mem
		1608
		1609	=item ($type, $name) = $mem->gl_object_info
		1610
		1611	Returns the OpenGL object type (e.g. OpenCL::GL_OBJECT_TEXTURE2D) and the
		1612	object "name" (e.g. the texture name) used to create this memory object.
		1613
		1614	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetGLObjectInfo.html>
		1615
461	=back	1616	=back
462		1617
		1618	=head2 THE OpenCL::Buffer CLASS
		1619
		1620	This is a subclass of OpenCL::Memory, and the superclass of
		1621	OpenCL::BufferObj. Its purpose is simply to distinguish between buffers
		1622	and sub-buffers.
		1623
		1624	=head2 THE OpenCL::BufferObj CLASS
		1625
		1626	This is a subclass of OpenCL::Buffer and thus OpenCL::Memory. It exists
		1627	because one cna create sub buffers of OpenLC::BufferObj objects, but not
		1628	sub buffers from these sub buffers.
		1629
		1630	=over 4
		1631
		1632	=item $subbuf = $buf_obj->sub_buffer_region ($flags, $origin, $size)
		1633
		1634	Creates an OpenCL::Buffer objects from this buffer and returns it. The
		1635	C<buffer_create_type> is assumed to be C<CL_BUFFER_CREATE_TYPE_REGION>.
		1636
		1637	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateSubBuffer.html>
		1638
		1639	=back
		1640
		1641	=head2 THE OpenCL::Image CLASS
		1642
		1643	This is the superclass of all image objects - OpenCL::Image1D,
		1644	OpenCL::Image1DArray, OpenCL::Image1DBuffer, OpenCL::Image2D,
		1645	OpenCL::Image2DArray and OpenCL::Image3D.
		1646
		1647	=over 4
		1648
		1649	=item $packed_value = $image->image_info ($name)
		1650
		1651	See C<< $platform->info >> for details.
		1652
		1653	The reason this method is not called C<info> is that there already is an
		1654	C<< ->info >> method inherited from C<OpenCL::Memory>.
		1655
		1656	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetImageInfo.html>
		1657
		1658	=item ($channel_order, $channel_data_type) = $image->format
		1659
		1660	Returns the channel order and type used to create the image by calling
		1661	C<clGetImageInfo> with C<CL_IMAGE_FORMAT>.
		1662
		1663	=for gengetinfo begin image
		1664
		1665	=item $int = $image->element_size
		1666
		1667	Calls C<clGetImageInfo> with C<OpenCL::IMAGE_ELEMENT_SIZE> and returns the result.
		1668
		1669	=item $int = $image->row_pitch
		1670
		1671	Calls C<clGetImageInfo> with C<OpenCL::IMAGE_ROW_PITCH> and returns the result.
		1672
		1673	=item $int = $image->slice_pitch
		1674
		1675	Calls C<clGetImageInfo> with C<OpenCL::IMAGE_SLICE_PITCH> and returns the result.
		1676
		1677	=item $int = $image->width
		1678
		1679	Calls C<clGetImageInfo> with C<OpenCL::IMAGE_WIDTH> and returns the result.
		1680
		1681	=item $int = $image->height
		1682
		1683	Calls C<clGetImageInfo> with C<OpenCL::IMAGE_HEIGHT> and returns the result.
		1684
		1685	=item $int = $image->depth
		1686
		1687	Calls C<clGetImageInfo> with C<OpenCL::IMAGE_DEPTH> and returns the result.
		1688
		1689	=for gengetinfo end image
		1690
		1691	=for gengetinfo begin gl_texture
		1692
		1693	=item $GLenum = $gl_texture->target
		1694
		1695	Calls C<clGetGLTextureInfo> with C<OpenCL::GL_TEXTURE_TARGET> and returns the result.
		1696
		1697	=item $GLint = $gl_texture->gl_mipmap_level
		1698
		1699	Calls C<clGetGLTextureInfo> with C<OpenCL::GL_MIPMAP_LEVEL> and returns the result.
		1700
		1701	=for gengetinfo end gl_texture
		1702
		1703	=back
		1704
463	=head2 THE OpenCL::Sampler CLASS	1705	=head2 THE OpenCL::Sampler CLASS
464		1706
465	=over 4	1707	=over 4
466		1708
467	=item $packed_value = $sampler->info ($name)	1709	=item $packed_value = $sampler->info ($name)
468		1710
469	See C<< $platform->info >> for details.	1711	See C<< $platform->info >> for details.
470		1712
471	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetSamplerInfo.html>	1713	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetSamplerInfo.html>
472		1714
		1715	=for gengetinfo begin sampler
		1716
		1717	=item $uint = $sampler->reference_count
		1718
		1719	Calls C<clGetSamplerInfo> with C<OpenCL::SAMPLER_REFERENCE_COUNT> and returns the result.
		1720
		1721	=item $ctx = $sampler->context
		1722
		1723	Calls C<clGetSamplerInfo> with C<OpenCL::SAMPLER_CONTEXT> and returns the result.
		1724
		1725	=item $addressing_mode = $sampler->normalized_coords
		1726
		1727	Calls C<clGetSamplerInfo> with C<OpenCL::SAMPLER_NORMALIZED_COORDS> and returns the result.
		1728
		1729	=item $filter_mode = $sampler->addressing_mode
		1730
		1731	Calls C<clGetSamplerInfo> with C<OpenCL::SAMPLER_ADDRESSING_MODE> and returns the result.
		1732
		1733	=item $boolean = $sampler->filter_mode
		1734
		1735	Calls C<clGetSamplerInfo> with C<OpenCL::SAMPLER_FILTER_MODE> and returns the result.
		1736
		1737	=for gengetinfo end sampler
		1738
473	=back	1739	=back
474		1740
475	=head2 THE OpenCL::Program CLASS	1741	=head2 THE OpenCL::Program CLASS
476		1742
477	=over 4	1743	=over 4
478		1744
479	=item $packed_value = $program->info ($name)	1745	=item $program->build (\@devices = undef, $options = "", $cb->($program) = undef)
480		1746
481	See C<< $platform->info >> for details.
482
483	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetProgramInfo.html>
484
485	=item $program->build ($device, $options = "")
486
487	Tries to build the program with the givne options.	1747	Tries to build the program with the given options. See also the
		1748	C<$ctx->build> convenience function.
		1749
		1750	If a callback is specified, then it will be called when compilation is
		1751	finished. Note that many OpenCL implementations block your program while
		1752	compiling whether you use a callback or not. See C<build_async> if you
		1753	want to make sure the build is done in the background.
		1754
		1755	Note that some OpenCL implementations act up badly, and don't call the
		1756	callback in some error cases (but call it in others). This implementation
		1757	assumes the callback will always be called, and leaks memory if this is
		1758	not so. So best make sure you don't pass in invalid values.
		1759
		1760	Some implementations fail with C<OpenCL::INVALID_BINARY> when the
		1761	compilation state is successful but some later stage fails.
		1762
		1763	options: C<-D name>, C<-D name=definition>, C<-I dir>,
		1764	C<-cl-single-precision-constant>, C<-cl-denorms-are-zero>,
		1765	C<-cl-fp32-correctly-rounded-divide-sqrt>, C<-cl-opt-disable>,
		1766	C<-cl-mad-enable>, C<-cl-no-signed-zeros>, C<-cl-unsafe-math-optimizations>,
		1767	C<-cl-finite-math-only>, C<-cl-fast-relaxed-math>,
		1768	C<-w>, C<-Werror>, C<-cl-std=CL1.1/CL1.2>, C<-cl-kernel-arg-info>,
		1769	C<-create-library>, C<-enable-link-options>.
488		1770
489	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clBuildProgram.html>	1771	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clBuildProgram.html>
		1772
		1773	=item $program->build_async (\@devices = undef, $options = "", $cb->($program) = undef)
		1774
		1775	Similar to C<< ->build >>, except it starts a thread, and never fails (you
		1776	need to check the compilation status form the callback, or by polling).
		1777
		1778	build_status: OpenCL::BUILD_SUCCESS, OpenCL::BUILD_NONE,
		1779	OpenCL::BUILD_ERROR, OpenCL::BUILD_IN_PROGRESS.
490		1780
491	=item $packed_value = $program->build_info ($device, $name)	1781	=item $packed_value = $program->build_info ($device, $name)
492		1782
493	Similar to C<< $platform->info >>, but returns build info for a previous	1783	Similar to C<< $platform->info >>, but returns build info for a previous
494	build attempt for the given device.	1784	build attempt for the given device.
…		…
500	Creates an OpenCL::Kernel object out of the named C<__kernel> function in	1790	Creates an OpenCL::Kernel object out of the named C<__kernel> function in
501	the program.	1791	the program.
502		1792
503	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateKernel.html>	1793	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateKernel.html>
504		1794
		1795	=item @kernels = $program->kernels_in_program
		1796
		1797	Returns all kernels successfully compiled for all devices in program.
		1798
		1799	http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateKernelsInProgram.html
		1800
		1801	=for gengetinfo begin program_build
		1802
		1803	=item $build_status = $program->build_status ($device)
		1804
		1805	Calls C<clGetProgramBuildInfo> with C<OpenCL::PROGRAM_BUILD_STATUS> and returns the result.
		1806
		1807	=item $string = $program->build_options ($device)
		1808
		1809	Calls C<clGetProgramBuildInfo> with C<OpenCL::PROGRAM_BUILD_OPTIONS> and returns the result.
		1810
		1811	=item $string = $program->build_log ($device)
		1812
		1813	Calls C<clGetProgramBuildInfo> with C<OpenCL::PROGRAM_BUILD_LOG> and returns the result.
		1814
		1815	=for gengetinfo end program_build
		1816
		1817	=item $packed_value = $program->info ($name)
		1818
		1819	See C<< $platform->info >> for details.
		1820
		1821	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetProgramInfo.html>
		1822
		1823	=for gengetinfo begin program
		1824
		1825	=item $uint = $program->reference_count
		1826
		1827	Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_REFERENCE_COUNT> and returns the result.
		1828
		1829	=item $ctx = $program->context
		1830
		1831	Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_CONTEXT> and returns the result.
		1832
		1833	=item $uint = $program->num_devices
		1834
		1835	Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_NUM_DEVICES> and returns the result.
		1836
		1837	=item @devices = $program->devices
		1838
		1839	Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_DEVICES> and returns the result.
		1840
		1841	=item $string = $program->source
		1842
		1843	Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_SOURCE> and returns the result.
		1844
		1845	=item @ints = $program->binary_sizes
		1846
		1847	Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_BINARY_SIZES> and returns the result.
		1848
		1849	=for gengetinfo end program
		1850
		1851	=item @blobs = $program->binaries
		1852
		1853	Returns a string for the compiled binary for every device associated with
		1854	the program, empty strings indicate missing programs, and an empty result
		1855	means no program binaries are available.
		1856
		1857	These "binaries" are often, in fact, informative low-level assembly
		1858	sources.
		1859
		1860	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetProgramInfo.html>
		1861
505	=back	1862	=back
506		1863
507	=head2 THE OpenCL::Kernel CLASS	1864	=head2 THE OpenCL::Kernel CLASS
508		1865
509	=over 4	1866	=over 4
…		…
512		1869
513	See C<< $platform->info >> for details.	1870	See C<< $platform->info >> for details.
514		1871
515	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetKernelInfo.html>	1872	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetKernelInfo.html>
516		1873
		1874	=for gengetinfo begin kernel
		1875
		1876	=item $string = $kernel->function_name
		1877
		1878	Calls C<clGetKernelInfo> with C<OpenCL::KERNEL_FUNCTION_NAME> and returns the result.
		1879
		1880	=item $uint = $kernel->num_args
		1881
		1882	Calls C<clGetKernelInfo> with C<OpenCL::KERNEL_NUM_ARGS> and returns the result.
		1883
		1884	=item $uint = $kernel->reference_count
		1885
		1886	Calls C<clGetKernelInfo> with C<OpenCL::KERNEL_REFERENCE_COUNT> and returns the result.
		1887
		1888	=item $ctx = $kernel->context
		1889
		1890	Calls C<clGetKernelInfo> with C<OpenCL::KERNEL_CONTEXT> and returns the result.
		1891
		1892	=item $program = $kernel->program
		1893
		1894	Calls C<clGetKernelInfo> with C<OpenCL::KERNEL_PROGRAM> and returns the result.
		1895
		1896	=for gengetinfo end kernel
		1897
		1898	=item $packed_value = $kernel->work_group_info ($device, $name)
		1899
		1900	See C<< $platform->info >> for details.
		1901
		1902	The reason this method is not called C<info> is that there already is an
		1903	C<< ->info >> method.
		1904
		1905	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetKernelWorkGroupInfo.html>
		1906
		1907	=for gengetinfo begin kernel_work_group
		1908
		1909	=item $int = $kernel->work_group_size ($device)
		1910
		1911	Calls C<clGetKernelWorkGroupInfo> with C<OpenCL::KERNEL_WORK_GROUP_SIZE> and returns the result.
		1912
		1913	=item @ints = $kernel->compile_work_group_size ($device)
		1914
		1915	Calls C<clGetKernelWorkGroupInfo> with C<OpenCL::KERNEL_COMPILE_WORK_GROUP_SIZE> and returns the result.
		1916
		1917	=item $ulong = $kernel->local_mem_size ($device)
		1918
		1919	Calls C<clGetKernelWorkGroupInfo> with C<OpenCL::KERNEL_LOCAL_MEM_SIZE> and returns the result.
		1920
		1921	=item $int = $kernel->preferred_work_group_size_multiple ($device)
		1922
		1923	Calls C<clGetKernelWorkGroupInfo> with C<OpenCL::KERNEL_PREFERRED_WORK_GROUP_SIZE_MULTIPLE> and returns the result.
		1924
		1925	=item $ulong = $kernel->private_mem_size ($device)
		1926
		1927	Calls C<clGetKernelWorkGroupInfo> with C<OpenCL::KERNEL_PRIVATE_MEM_SIZE> and returns the result.
		1928
		1929	=for gengetinfo end kernel_work_group
		1930
		1931	=for gengetinfo begin kernel_arg_info
		1932
		1933	=for gengetinfo end kernel_arg_info
		1934
		1935	=item $kernel->setf ($format, ...)
		1936
		1937	Sets the arguments of a kernel. Since OpenCL 1.1 doesn't have a generic
		1938	way to set arguments (and with OpenCL 1.2 it might be rather slow), you
		1939	need to specify a format argument, much as with C<printf>, to tell OpenCL
		1940	what type of argument it is.
		1941
		1942	The format arguments are single letters:
		1943
		1944	c char
		1945	C unsigned char
		1946	s short
		1947	S unsigned short
		1948	i int
		1949	I unsigned int
		1950	l long
		1951	L unsigned long
		1952
		1953	h half float (0..65535)
		1954	f float
		1955	d double
		1956
		1957	z local (octet size)
		1958
		1959	m memory object (buffer or image)
		1960	a sampler
		1961	e event
		1962
		1963	Space characters in the format string are ignored.
		1964
		1965	Example: set the arguments for a kernel that expects an int, two floats, a buffer and an image.
		1966
		1967	$kernel->setf ("i ff mm", 5, 0.5, 3, $buffer, $image);
		1968
517	=item $kernel->set_TYPE ($index, $value)	1969	=item $kernel->set_TYPE ($index, $value)
518		1970
		1971	=item $kernel->set_char ($index, $value)
		1972
		1973	=item $kernel->set_uchar ($index, $value)
		1974
		1975	=item $kernel->set_short ($index, $value)
		1976
		1977	=item $kernel->set_ushort ($index, $value)
		1978
		1979	=item $kernel->set_int ($index, $value)
		1980
		1981	=item $kernel->set_uint ($index, $value)
		1982
		1983	=item $kernel->set_long ($index, $value)
		1984
		1985	=item $kernel->set_ulong ($index, $value)
		1986
		1987	=item $kernel->set_half ($index, $value)
		1988
		1989	=item $kernel->set_float ($index, $value)
		1990
		1991	=item $kernel->set_double ($index, $value)
		1992
		1993	=item $kernel->set_memory ($index, $value)
		1994
		1995	=item $kernel->set_buffer ($index, $value)
		1996
		1997	=item $kernel->set_image ($index, $value)
		1998
		1999	=item $kernel->set_sampler ($index, $value)
		2000
		2001	=item $kernel->set_local ($index, $value)
		2002
		2003	=item $kernel->set_event ($index, $value)
		2004
519	This is a family of methods to set the kernel argument with the number C<$index> to the give C<$value>.	2005	This is a family of methods to set the kernel argument with the number
520		2006	C<$index> to the give C<$value>.
521	TYPE is one of C<char>, C<uchar>, C<short>, C<ushort>, C<int>, C<uint>,
522	C<long>, C<ulong>, C<half>, C<float>, C<double>, C<memory>, C<buffer>,
523	C<image2d>, C<image3d>, C<sampler> or C<event>.
524		2007
525	Chars and integers (including the half type) are specified as integers,	2008	Chars and integers (including the half type) are specified as integers,
526	float and double as floating point values, memory/buffer/image2d/image3d	2009	float and double as floating point values, memory/buffer/image must be
527	must be an object of that type or C<undef>, and sampler and event must be	2010	an object of that type or C<undef>, local-memory arguments are set by
528	objects of that type.	2011	specifying the size, and sampler and event must be objects of that type.
		2012
		2013	Note that C<set_memory> works for all memory objects (all types of buffers
		2014	and images) - the main purpose of the more specific C<set_TYPE> functions
		2015	is type checking.
		2016
		2017	Setting an argument for a kernel does NOT keep a reference to the object -
		2018	for example, if you set an argument to some image object, free the image,
		2019	and call the kernel, you will run into undefined behaviour.
529		2020
530	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetKernelArg.html>	2021	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetKernelArg.html>
531		2022
532	=back	2023	=back
533		2024
…		…
536	This is the superclass for all event objects (including OpenCL::UserEvent	2027	This is the superclass for all event objects (including OpenCL::UserEvent
537	objects).	2028	objects).
538		2029
539	=over 4	2030	=over 4
540		2031
		2032	=item $ev->wait
		2033
		2034	Waits for the event to complete.
		2035
		2036	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>
		2037
		2038	=item $ev->cb ($exec_callback_type, $callback->($event, $event_command_exec_status))
		2039
		2040	Adds a callback to the callback stack for the given event type. There is
		2041	no way to remove a callback again.
		2042
		2043	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetEventCallback.html>
		2044
541	=item $packed_value = $ev->info ($name)	2045	=item $packed_value = $ev->info ($name)
542		2046
543	See C<< $platform->info >> for details.	2047	See C<< $platform->info >> for details.
544		2048
545	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetEventInfo.html>	2049	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetEventInfo.html>
546		2050
547	=item $ev->wait	2051	=for gengetinfo begin event
548		2052
549	Waits for the event to complete.	2053	=item $queue = $event->command_queue
550		2054
		2055	Calls C<clGetEventInfo> with C<OpenCL::EVENT_COMMAND_QUEUE> and returns the result.
		2056
		2057	=item $command_type = $event->command_type
		2058
		2059	Calls C<clGetEventInfo> with C<OpenCL::EVENT_COMMAND_TYPE> and returns the result.
		2060
		2061	=item $uint = $event->reference_count
		2062
		2063	Calls C<clGetEventInfo> with C<OpenCL::EVENT_REFERENCE_COUNT> and returns the result.
		2064
		2065	=item $uint = $event->command_execution_status
		2066
		2067	Calls C<clGetEventInfo> with C<OpenCL::EVENT_COMMAND_EXECUTION_STATUS> and returns the result.
		2068
		2069	=item $ctx = $event->context
		2070
		2071	Calls C<clGetEventInfo> with C<OpenCL::EVENT_CONTEXT> and returns the result.
		2072
		2073	=for gengetinfo end event
		2074
		2075	=item $packed_value = $ev->profiling_info ($name)
		2076
		2077	See C<< $platform->info >> for details.
		2078
		2079	The reason this method is not called C<info> is that there already is an
		2080	C<< ->info >> method.
		2081
551	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>	2082	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetProfilingInfo.html>
		2083
		2084	=for gengetinfo begin profiling
		2085
		2086	=item $ulong = $event->profiling_command_queued
		2087
		2088	Calls C<clGetEventProfilingInfo> with C<OpenCL::PROFILING_COMMAND_QUEUED> and returns the result.
		2089
		2090	=item $ulong = $event->profiling_command_submit
		2091
		2092	Calls C<clGetEventProfilingInfo> with C<OpenCL::PROFILING_COMMAND_SUBMIT> and returns the result.
		2093
		2094	=item $ulong = $event->profiling_command_start
		2095
		2096	Calls C<clGetEventProfilingInfo> with C<OpenCL::PROFILING_COMMAND_START> and returns the result.
		2097
		2098	=item $ulong = $event->profiling_command_end
		2099
		2100	Calls C<clGetEventProfilingInfo> with C<OpenCL::PROFILING_COMMAND_END> and returns the result.
		2101
		2102	=for gengetinfo end profiling
552		2103
553	=back	2104	=back
554		2105
555	=head2 THE OpenCL::UserEvent CLASS	2106	=head2 THE OpenCL::UserEvent CLASS
556		2107
…		…
558		2109
559	=over 4	2110	=over 4
560		2111
561	=item $ev->set_status ($execution_status)	2112	=item $ev->set_status ($execution_status)
562		2113
		2114	Sets the execution status of the user event. Can only be called once,
		2115	either with OpenCL::COMPLETE or a negative number as status.
		2116
		2117	execution_status: OpenCL::COMPLETE or a negative integer.
		2118
563	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetUserEventStatus.html>	2119	L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetUserEventStatus.html>
564		2120
565	=back	2121	=back
566		2122
		2123	=head2 THE OpenCL::Mapped CLASS
		2124
		2125	This class represents objects mapped into host memory. They are
		2126	represented by a blessed string scalar. The string data is the mapped
		2127	memory area, that is, if you read or write it, then the mapped object is
		2128	accessed directly.
		2129
		2130	You must only ever use operations that modify the string in-place - for
		2131	example, a C<substr> that doesn't change the length, or maybe a regex that
		2132	doesn't change the length. Any other operation might cause the data to be
		2133	copied.
		2134
		2135	When the object is destroyed it will enqueue an implicit unmap operation
		2136	on the queue that was used to create it.
		2137
		2138	Keep in mind that you I<need> to unmap (or destroy) mapped objects before
		2139	OpenCL sees the changes, even if some implementations don't need this
		2140	sometimes.
		2141
		2142	Example, replace the first two floats in the mapped buffer by 1 and 2.
		2143
		2144	my $mapped = $queue->map_buffer ($buf, ...
		2145	$mapped->event->wait; # make sure it's there
		2146
		2147	# now replace first 8 bytes by new data, which is exactly 8 bytes long
		2148	# we blindly assume device endianness to equal host endianness
		2149	# (and of course, we assume iee 754 single precision floats :)
		2150	substr $$mapped, 0, 8, pack "f*", 1, 2;
		2151
		2152	=over 4
		2153
		2154	=item $ev = $mapped->unmap ($wait_events...)
		2155
		2156	Unmaps the mapped memory object, using the queue originally used to create
		2157	it, quite similarly to C<< $queue->unmap ($mapped, ...) >>.
		2158
		2159	=item $bool = $mapped->mapped
		2160
		2161	Returns whether the object is still mapped - true before an C<unmap> is
		2162	enqueued, false afterwards.
		2163
		2164	=item $ev = $mapped->event
		2165
		2166	Return the event object associated with the mapped object. Initially, this
		2167	will be the event object created when mapping the object, and after an
		2168	unmap, this will be the event object that the unmap operation created.
		2169
		2170	=item $mapped->wait
		2171
		2172	Same as C<< $mapped->event->wait >> - makes sure no operations on this
		2173	mapped object are outstanding.
		2174
		2175	=item $bytes = $mapped->size
		2176
		2177	Returns the size of the mapped area, in bytes. Same as C<length $$mapped>.
		2178
		2179	=item $ptr = $mapped->ptr
		2180
		2181	Returns the raw memory address of the mapped area.
		2182
		2183	=item $mapped->set ($offset, $data)
		2184
		2185	Replaces the data at the given C<$offset> in the memory area by the new
		2186	C<$data>. This method is safer than direct manipulation of C<$mapped>
		2187	because it does bounds-checking, but also slower.
		2188
		2189	=item $data = $mapped->get ($offset, $length)
		2190
		2191	Returns (without copying) a scalar representing the data at the given
		2192	C<$offset> and C<$length> in the mapped memory area. This is the same as
		2193	the following substr, except much slower;
		2194
		2195	$data = substr $$mapped, $offset, $length
		2196
567	=cut	2197	=cut
568		2198
569	package OpenCL;	2199	sub OpenCL::Mapped::get {
570		2200	substr ${$_[0]}, $_[1], $_[2]
571	use common::sense;
572
573	BEGIN {
574	our $VERSION = '0.03';
575
576	require XSLoader;
577	XSLoader::load (__PACKAGE__, $VERSION);
578
579	@OpenCL::Buffer::ISA =
580	@OpenCL::Image::ISA = OpenCL::Memory::;
581
582	@OpenCL::Image2D::ISA =
583	@OpenCL::Image3D::ISA = OpenCL::Image::;
584
585	@OpenCL::UserEvent::ISA = OpenCL::Event::;
586	}	2201	}
		2202
		2203	=back
		2204
		2205	=head2 THE OpenCL::MappedBuffer CLASS
		2206
		2207	This is a subclass of OpenCL::Mapped, representing mapped buffers.
		2208
		2209	=head2 THE OpenCL::MappedImage CLASS
		2210
		2211	This is a subclass of OpenCL::Mapped, representing mapped images.
		2212
		2213	=over 4
		2214
		2215	=item $bytes = $mapped->row_pitch
		2216
		2217	=item $bytes = $mapped->slice_pitch
		2218
		2219	Return the row or slice pitch of the image that has been mapped.
		2220
		2221	=back
		2222
		2223
		2224	=cut
587		2225
588	1;	2226	1;
589		2227
590	=head1 AUTHOR	2228	=head1 AUTHOR
591		2229

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