[ViewVC] Diff of: cvs/OpenCL/OpenCL.pm

Comparing OpenCL/OpenCL.pm (file contents):
Revision 1.29 by root, Thu Apr 5 07:13:44 2012 UTC vs.
Revision 1.76 by root, Sat May 5 02:45:38 2012 UTC

 OpenCL::Event objects are used to signal when something is complete.
 =head2 HELPFUL RESOURCES
-The OpenCL spec used to develop this module (1.2 spec was available, but
+The OpenCL specs used to develop this module - download these and keept
-no implementation was available to me :).
+hema round, they are required reference material:
    http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf
+   http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf
+   http://www.khronos.org/registry/cl/specs/opencl-1.2-extensions.pdf
 OpenCL manpages:
    http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/
+   http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/
 If you are into UML class diagrams, the following diagram might help - if
-not, it will be mildly cobfusing:
+not, it will be mildly confusing (also, the class hierarchy of this module
+is much more fine-grained):
-   http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/classDiagram.html
+   http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/classDiagram.html
 Here's a tutorial from AMD (very AMD-centric, too), not sure how useful it
 is, but at least it's free of charge:
    http://developer.amd.com/zones/OpenCLZone/courses/Documents/Introduction_to_OpenCL_Programming%20Training_Guide%20%28201005%29.pdf
 =head2 Create a buffer with some predefined data, read it back synchronously,
 then asynchronously.
    my $buf = $ctx->buffer_sv (OpenCL::MEM_COPY_HOST_PTR, "helmut");
-   $queue->enqueue_read_buffer ($buf, 1, 1, 3, my $data);
+   $queue->read_buffer ($buf, 1, 1, 3, my $data);
    print "$data\n";
-   my $ev = $queue->enqueue_read_buffer ($buf, 0, 1, 3, my $data);
+   my $ev = $queue->read_buffer ($buf, 0, 1, 3, my $data);
    $ev->wait;
    print "$data\n"; # prints "elm"
 =head2 Create and build a program, then create a kernel out of one of its
 functions.
    my $src = '
-      __kernel void
+      kernel void
-      squareit (__global float *input, __global float *output)
+      squareit (global float *input, global float *output)
       {
         $id = get_global_id (0);
         output [id] = input [id] * input [id];
       }
    ';
-   my $prog = $ctx->program_with_source ($src);
+   my $prog = $ctx->build_program ($src);
-   # build croaks on compile errors, so catch it and print the compile errors
-   eval { $prog->build ($dev); 1 }
-      or die $prog->build_log;
    my $kernel = $prog->kernel ("squareit");
 =head2 Create some input and output float buffers, then call the
 'squareit' kernel on them.
    # set buffer
    $kernel->set_buffer (0, $input);
    $kernel->set_buffer (1, $output);
    # execute it for all 4 numbers
-   $queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);
+   $queue->nd_range_kernel ($kernel, undef, [4], undef);
    # enqueue a synchronous read
-   $queue->enqueue_read_buffer ($output, 1, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);
+   $queue->read_buffer ($output, 1, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);
    # print the results:
    printf "%s\n", join ", ", unpack "f*", $data;
 =head2 The same enqueue operations as before, but assuming an out-of-order queue,
 showing off barriers.
    # execute it for all 4 numbers
-   $queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);
+   $queue->nd_range_kernel ($kernel, undef, [4], undef);
    # enqueue a barrier to ensure in-order execution
-   $queue->enqueue_barrier;
+   $queue->barrier;
    # enqueue an async read
-   $queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);
+   $queue->read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data);
    # wait for all requests to finish
    $queue->finish;
 =head2 The same enqueue operations as before, but assuming an out-of-order queue,
 showing off event objects and wait lists.
    # execute it for all 4 numbers
-   my $ev = $queue->enqueue_nd_range_kernel ($kernel, undef, [4], undef);
+   my $ev = $queue->nd_range_kernel ($kernel, undef, [4], undef);
    # enqueue an async read
-   $ev = $queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data, $ev);
+   $ev = $queue->read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data, $ev);
    # wait for the last event to complete
    $ev->wait;
+=head2 Use the OpenGL module to share a texture between OpenCL and OpenGL and draw some julia
+set flight effect.
+This is quite a long example to get you going - you can download it from
+L<http://cvs.schmorp.de/OpenCL/examples/juliaflight>.
+   use OpenGL ":all";
+   use OpenCL;
+   my $S = $ARGV[0] || 256; # window/texture size, smaller is faster
+   # open a window and create a gl texture
+   OpenGL::glpOpenWindow width => $S, height => $S;
+   my $texid = glGenTextures_p 1;
+   glBindTexture GL_TEXTURE_2D, $texid;
+   glTexImage2D_c GL_TEXTURE_2D, 0, GL_RGBA8, $S, $S, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0;
+   # find and use the first opencl device that let's us get a shared opengl context
+   my $platform;
+   my $dev;
+   my $ctx;
+   for (OpenCL::platforms) {
+      $platform = $_;
+      for ($platform->devices) {
+         $dev = $_;
+         $ctx = $platform->context ([OpenCL::GLX_DISPLAY_KHR, undef, OpenCL::GL_CONTEXT_KHR, undef], [$dev])
+            and last;
+      }
+   }
+   $ctx
+      or die "cannot find suitable OpenCL device\n";
+   my $queue = $ctx->queue ($dev);
+   # now attach an opencl image2d object to the opengl texture
+   my $tex = $ctx->gl_texture2d (OpenCL::MEM_WRITE_ONLY, GL_TEXTURE_2D, 0, $texid);
+   # now the boring opencl code
+   my $src = <<EOF;
+   kernel void
+   juliatunnel (write_only image2d_t img, float time)
+   {
+     int2 xy = (int2)(get_global_id (0), get_global_id (1));
+     float2 p = convert_float2 (xy) / $S.f * 2.f - 1.f;
+     float2 m = (float2)(1.f, p.y) / fabs (p.x); // tunnel
+     m.x = fabs (fmod (m.x + time * 0.05f, 4.f) - 2.f);
+     float2 z = m;
+     float2 c = (float2)(sin (time * 0.01133f), cos (time * 0.02521f));
+     for (int i = 0; i < 25 && dot (z, z) < 4.f; ++i) // standard julia
+       z = (float2)(z.x * z.x - z.y * z.y, 2.f * z.x * z.y) + c;
+     float3 colour = (float3)(z.x, z.y, atan2 (z.y, z.x));
+     write_imagef (img, xy, (float4)(colour * p.x * p.x, 1.));
+   }
+   EOF
+   my $prog = $ctx->build_program ($src);
+   my $kernel = $prog->kernel ("juliatunnel");
+   # program compiled, kernel ready, now draw and loop
+   for (my $time; ; ++$time) {
+      # acquire objects from opengl
+      $queue->acquire_gl_objects ([$tex]);
+      # configure and run our kernel
+      $kernel->setf ("mf", $tex, $time*2); # mf = memory object, float
+      $queue->nd_range_kernel ($kernel, undef, [$S, $S], undef);
+      # release objects to opengl again
+      $queue->release_gl_objects ([$tex]);
+      # wait
+      $queue->finish;
+      # now draw the texture, the defaults should be all right
+      glTexParameterf GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST;
+      glEnable GL_TEXTURE_2D;
+      glBegin GL_QUADS;
+         glTexCoord2f 0, 1; glVertex3i -1, -1, -1;
+         glTexCoord2f 0, 0; glVertex3i  1, -1, -1;
+         glTexCoord2f 1, 0; glVertex3i  1,  1, -1;
+         glTexCoord2f 1, 1; glVertex3i -1,  1, -1;
+      glEnd;
+      glXSwapBuffers;
+      select undef, undef, undef, 1/60;
+   }
+=head2 How to modify the previous example to not rely on GL sharing.
+For those poor souls with only a sucky CPU OpenCL implementation, you
+currently have to read the image into some perl scalar, and then modify a
+texture or use glDrawPixels or so).
+First, when you don't need gl sharing, you can create the context much simpler:
+   $ctx = $platform->context (undef, [$dev])
+To use a texture, you would modify the above example by creating an
+OpenCL::Image manually instead of deriving it from a texture:
+   my $tex = $ctx->image2d (OpenCL::MEM_WRITE_ONLY, OpenCL::RGBA, OpenCL::UNORM_INT8, $S, $S);
+And in the draw loop, intead of acquire_gl_objects/release_gl_objects, you
+would read the image2d after the kernel has written it:
+   $queue->read_image ($tex, 0, 0, 0, 0, $S, $S, 1, 0, 0, my $data);
+And then you would upload the pixel data to the texture (or use glDrawPixels):
+   glTexSubImage2D_s GL_TEXTURE_2D, 0, 0, 0, $S, $S, GL_RGBA, GL_UNSIGNED_BYTE, $data;
+The fully modified example can be found at
+L<http://cvs.schmorp.de/OpenCL/examples/juliaflight-nosharing>.
+=head2 Julia sets look soooo 80ies.
+Then colour them differently, e.g. using orbit traps! Replace the loop and
+colour calculation from the previous examples by this:
+  float2 dm = (float2)(1.f, 1.f);
+  for (int i = 0; i < 25; ++i)
+    {
+      z = (float2)(z.x * z.x - z.y * z.y, 2.f * z.x * z.y) + c;
+      dm = fmin (dm, (float2)(fabs (dot (z, z) - 1.f), fabs (z.x - 1.f)));
+    }
+  float3 colour = (float3)(dm.x * dm.y, dm.x * dm.y, dm.x);
+Also try C<-10.f> instead of C<-1.f>.
 =head1 DOCUMENTATION
 =head2 BASIC CONVENTIONS
 =item * Structures are often specified by flattening out their components
 as with short vectors, and returned as arrayrefs.
 =item * When enqueuing commands, the wait list is specified by adding
 extra arguments to the function - anywhere a C<$wait_events...> argument
-is documented this can be any number of event objects.
+is documented this can be any number of event objects. As an extsnion
+implemented by this module, C<undef> values will be ignored in the event
+list.
 =item * When enqueuing commands, if the enqueue method is called in void
 context, no event is created. In all other contexts an event is returned
 by the method.
    ulong     IV     -         Q
    float     NV     float     f
    half      IV     ushort    S
    double    NV     double    d
+=head2 GLX SUPPORT
+Due to the sad state that OpenGL support is in in Perl (mostly the OpenGL
+module, which has little to no documentation and has little to no support
+for glX), this module, as a special extension, treats context creation
+properties C<OpenCL::GLX_DISPLAY_KHR> and C<OpenCL::GL_CONTEXT_KHR>
+specially: If either or both of these are C<undef>, then the OpenCL
+module tries to dynamically resolve C<glXGetCurrentDisplay> and
+C<glXGetCurrentContext>, call these functions and use their return values
+instead.
+For this to work, the OpenGL library must be loaded, a GLX context must
+have been created and be made current, and C<dlsym> must be available and
+capable of finding the function via C<RTLD_DEFAULT>.
+=head2 EVENT SYSTEM
+OpenCL can generate a number of (potentially) asynchronous events, for
+example, after compiling a program, to signal a context-related error or,
+perhaps most important, to signal completion of queued jobs (by setting
+callbacks on OpenCL::Event objects).
+The OpenCL module converts all these callbacks into events - you can
+still register callbacks, but they are not executed when your OpenCL
+implementation calls the actual callback, but only later. Therefore, none
+of the limitations of OpenCL callbacks apply to the perl implementation:
+it is perfectly safe to make blocking operations from event callbacks, and
+enqueued operations don't need to be flushed.
+To facilitate this, this module maintains an event queue - each
+time an asynchronous event happens, it is queued, and perl will be
+interrupted. This is implemented via the L<Async::Interrupt> module. In
+addition, this module has L<AnyEvent> support, so it can seamlessly
+integrate itself into many event loops.
+Since L<Async::Interrupt> is a bit hard to understand, here are some case examples:
+=head3 Don't use callbacks.
+When your program never uses any callbacks, then there will never be any
+notifications you need to take care of, and therefore no need to worry
+about all this.
+You can achieve a great deal by explicitly waiting for events, or using
+barriers and flush calls. In many programs, there is no need at all to
+tinker with asynchronous events.
+=head3 Use AnyEvent
+This module automatically registers a watcher that invokes all outstanding
+event callbacks when AnyEvent is initialised (and block asynchronous
+interruptions). Using this mode of operations is the safest and most
+recommended one.
+To use this, simply use AnyEvent and this module normally, make sure you
+have an event loop running:
+   use Gtk2 -init;
+   use AnyEvent;
+   # initialise AnyEvent, by creating a watcher, or:
+   AnyEvent::detect;
+   my $e = $queue->marker;
+   $e->cb (sub {
+      warn "opencl is finished\n";
+   })
+   main Gtk2;
+Note that this module will not initialise AnyEvent for you. Before
+AnyEvent is initialised, the module will asynchronously interrupt perl
+instead. To avoid any surprises, it's best to explicitly initialise
+AnyEvent.
+You can temporarily enable asynchronous interruptions (see next paragraph)
+by calling C<$OpenCL::INTERRUPT->unblock> and disable them again by
+calling C<$OpenCL::INTERRUPT->block>.
+=head3 Let yourself be interrupted at any time
+This mode is the default unless AnyEvent is loaded and initialised. In
+this mode, OpenCL asynchronously interrupts a running perl program. The
+emphasis is on both I<asynchronously> and I<running> here.
+Asynchronously means that perl might execute your callbacks at any
+time. For example, in the following code (I<THAT YOU SHOULD NOT COPY>),
+the C<until> loop following the marker call will be interrupted by the
+callback:
+   my $e = $queue->marker;
+   my $flag;
+   $e->cb (sub { $flag = 1 });
+   1 until $flag;
+   # $flag is now 1
+The reason why you shouldn't blindly copy the above code is that
+busy waiting is a really really bad thing, and really really bad for
+performance.
+While at first this asynchronous business might look exciting, it can be
+really hard, because you need to be prepared for the callback code to be
+executed at any time, which limits the amount of things the callback code
+can do safely.
+This can be mitigated somewhat by using C<<
+$OpenCL::INTERRUPT->scope_block >> (see the L<Async::Interrupt>
+documentation for details).
+The other problem is that your program must be actively I<running> to be
+interrupted. When you calculate stuff, your program is running.  When you
+hang in some C functions or other block execution (by calling C<sleep>,
+C<select>, running an event loop and so on), your program is waiting, not
+running.
+One way around that would be to attach a read watcher to your event loop,
+listening for events on C<< $OpenCL::INTERRUPT->pipe_fileno >>, using a
+dummy callback (C<sub { }>) to temporarily execute some perl code.
+That is then awfully close to using the built-in AnyEvent support above,
+though, so consider that one instead.
+=head3 Be creative
+OpenCL exports the L<Async::Interrupt> object it uses in the global
+variable C<$OpenCL::INTERRUPT>. You can configure it in any way you like.
+So if you want to feel like a real pro, err, wait, if you feel no risk
+menas no fun, you can experiment by implementing your own mode of
+operations.
+=cut
+package OpenCL;
+use common::sense;
+use Carp ();
+use Async::Interrupt ();
+our $POLL_FUNC; # set by XS
+BEGIN {
+   our $VERSION = '0.99';
+   require XSLoader;
+   XSLoader::load (__PACKAGE__, $VERSION);
+   @OpenCL::Platform::ISA      =
+   @OpenCL::Device::ISA        =
+   @OpenCL::Context::ISA       =
+   @OpenCL::Queue::ISA         =
+   @OpenCL::Memory::ISA        =
+   @OpenCL::Sampler::ISA       =
+   @OpenCL::Program::ISA       =
+   @OpenCL::Kernel::ISA        =
+   @OpenCL::Event::ISA         = OpenCL::Object::;
+   @OpenCL::SubDevice::ISA     = OpenCL::Device::;
+   @OpenCL::Buffer::ISA        =
+   @OpenCL::Image::ISA         = OpenCL::Memory::;
+   @OpenCL::BufferObj::ISA     = OpenCL::Buffer::;
+   @OpenCL::Image2D::ISA       =
+   @OpenCL::Image3D::ISA       =
+   @OpenCL::Image2DArray::ISA  =
+   @OpenCL::Image1D::ISA       =
+   @OpenCL::Image1DArray::ISA  =
+   @OpenCL::Image1DBuffer::ISA = OpenCL::Image::;
+   @OpenCL::UserEvent::ISA     = OpenCL::Event::;
+   @OpenCL::MappedBuffer::ISA  =
+   @OpenCL::MappedImage::ISA   = OpenCL::Mapped::;
+}
 =head2 THE OpenCL PACKAGE
 =over 4
 =item $int = OpenCL::errno
 The last error returned by a function - it's only valid after an error occured
 and before calling another OpenCL function.
-=item $str = OpenCL::err2str $errval
+=item $str = OpenCL::err2str [$errval]
-Comverts an error value into a human readable string.
+Converts an error value into a human readable string. IF no error value is
+given, then the last error will be used (as returned by OpenCL::errno).
 =item $str = OpenCL::enum2str $enum
-Converts most enum values (inof parameter names, image format constants,
+Converts most enum values (of parameter names, image format constants,
 object types, addressing and filter modes, command types etc.) into a
-human readbale string. When confronted with some random integer it can be
+human readable string. When confronted with some random integer it can be
 very helpful to pass it through this function to maybe get some readable
 string out of it.
 =item @platforms = OpenCL::platforms
 Returns all available OpenCL::Platform objects.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetPlatformIDs.html>
-=item $ctx = OpenCL::context_from_type $properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $notify = undef
+=item $ctx = OpenCL::context_from_type $properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $callback->($err, $pvt) = $print_stderr
-Tries to create a context from a default device and platform - never worked for me.
+Tries to create a context from a default device and platform type - never worked for me.
+Consider using C<< $platform->context_from_type >> instead.
+type: OpenCL::DEVICE_TYPE_DEFAULT, OpenCL::DEVICE_TYPE_CPU, OpenCL::DEVICE_TYPE_GPU,
+OpenCL::DEVICE_TYPE_ACCELERATOR, OpenCL::DEVICE_TYPE_CUSTOM, OpenCL::DEVICE_TYPE_ALL.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>
+=item $ctx = OpenCL::context $properties, \@devices, $callback->($err, $pvt) = $print_stderr)
+Create a new OpenCL::Context object using the given device object(s).
+Consider using C<< $platform->context >> instead.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContext.html>
 =item OpenCL::wait_for_events $wait_events...
 Waits for all events to complete.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>
+=item OpenCL::poll
+Checks if there are any outstanding events (see L<EVENT SYSTEM>) and
+invokes their callbacks.
+=item $OpenCL::INTERRUPT
+The L<Async::Interrupt> object used to signal asynchronous events (see
+L<EVENT SYSTEM>).
+=cut
+our $INTERRUPT = new Async::Interrupt c_cb => [$POLL_FUNC, 0];
+&_eq_initialise ($INTERRUPT->signal_func);
+=item $OpenCL::WATCHER
+The L<AnyEvent> watcher object used to watch for asynchronous events (see
+L<EVENT SYSTEM>). This variable is C<undef> until L<AnyEvent> has been
+loaded I<and> initialised (e.g. by calling C<AnyEvent::detect>).
+=cut
+our $WATCHER;
+sub _init_anyevent {
+   $INTERRUPT->block;
+   $WATCHER = AE::io ($INTERRUPT->pipe_fileno, 0, sub { $INTERRUPT->handle });
+}
+if (defined $AnyEvent::MODEL) {
+   _init_anyevent;
+} else {
+   push @AnyEvent::post_detect, \&_init_anyevent;
+}
 =back
+=head2 THE OpenCL::Object CLASS
+This is the base class for all objects in the OpenCL module. The only
+method it implements is the C<id> method, which is only useful if you want
+to interface to OpenCL on the C level.
+=over 4
+=item $iv = $obj->id
+OpenCL objects are represented by pointers or integers on the C level. If
+you want to interface to an OpenCL object directly on the C level, then
+you need this value, which is returned by this method. You should use an
+C<IV> type in your code and cast that to the correct type.
+=cut
+sub OpenCL::Object::id {
+   ref $_[0] eq "SCALAR"
+      ? ${ $_[0] }
+      : $_[0][0]
+}
+=back
 =head2 THE OpenCL::Platform CLASS
 =over 4
 =item @devices = $platform->devices ($type = OpenCL::DEVICE_TYPE_ALL)
 Returns a list of matching OpenCL::Device objects.
-=item $ctx = $platform->context_from_type ($properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $notify = undef)
+=item $ctx = $platform->context_from_type ($properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $callback->($err, $pvt) = $print_stderr)
 Tries to create a context. Never worked for me, and you need devices explicitly anyway.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContextFromType.html>
-=item $ctx = $platform->context ($properties = undef, @$devices, $notify = undef)
+=item $ctx = $platform->context ($properties, \@devices, $callback->($err, $pvt) = $print_stderr)
 Create a new OpenCL::Context object using the given device object(s)- a
 CL_CONTEXT_PLATFORM property is supplied automatically.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateContext.html>
 It's best to avoid this method and use one of the following convenience
 wrappers.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetPlatformInfo.html>
+=item $platform->unload_compiler
+Attempts to unload the compiler for this platform, for endless
+profit. Does nothing on OpenCL 1.1.
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clUnloadPlatformCompiler.html>
 =for gengetinfo begin platform
 =item $string = $platform->profile
-Calls C<clGetPlatformInfo> with C<CL_PLATFORM_PROFILE> and returns the result.
+Calls C<clGetPlatformInfo> with C<OpenCL::PLATFORM_PROFILE> and returns the result.
 =item $string = $platform->version
-Calls C<clGetPlatformInfo> with C<CL_PLATFORM_VERSION> and returns the result.
+Calls C<clGetPlatformInfo> with C<OpenCL::PLATFORM_VERSION> and returns the result.
 =item $string = $platform->name
-Calls C<clGetPlatformInfo> with C<CL_PLATFORM_NAME> and returns the result.
+Calls C<clGetPlatformInfo> with C<OpenCL::PLATFORM_NAME> and returns the result.
 =item $string = $platform->vendor
-Calls C<clGetPlatformInfo> with C<CL_PLATFORM_VENDOR> and returns the result.
+Calls C<clGetPlatformInfo> with C<OpenCL::PLATFORM_VENDOR> and returns the result.
 =item $string = $platform->extensions
-Calls C<clGetPlatformInfo> with C<CL_PLATFORM_EXTENSIONS> and returns the result.
+Calls C<clGetPlatformInfo> with C<OpenCL::PLATFORM_EXTENSIONS> and returns the result.
 =for gengetinfo end platform
 =back
 See C<< $platform->info >> for details.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetDeviceInfo.html>
+=item @devices = $device->sub_devices (\@properties)
+Creates OpencL::SubDevice objects by partitioning an existing device.
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateSubDevices.html>
 =for gengetinfo begin device
 =item $device_type = $device->type
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_TYPE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_TYPE> and returns the result.
 =item $uint = $device->vendor_id
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_VENDOR_ID> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_VENDOR_ID> and returns the result.
 =item $uint = $device->max_compute_units
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_COMPUTE_UNITS> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_COMPUTE_UNITS> and returns the result.
 =item $uint = $device->max_work_item_dimensions
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_WORK_ITEM_DIMENSIONS> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_WORK_ITEM_DIMENSIONS> and returns the result.
 =item $int = $device->max_work_group_size
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_WORK_GROUP_SIZE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_WORK_GROUP_SIZE> and returns the result.
 =item @ints = $device->max_work_item_sizes
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_WORK_ITEM_SIZES> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_WORK_ITEM_SIZES> and returns the result.
 =item $uint = $device->preferred_vector_width_char
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_CHAR> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_CHAR> and returns the result.
 =item $uint = $device->preferred_vector_width_short
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_SHORT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_SHORT> and returns the result.
 =item $uint = $device->preferred_vector_width_int
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_INT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_INT> and returns the result.
 =item $uint = $device->preferred_vector_width_long
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_LONG> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_LONG> and returns the result.
 =item $uint = $device->preferred_vector_width_float
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT> and returns the result.
 =item $uint = $device->preferred_vector_width_double
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE> and returns the result.
 =item $uint = $device->max_clock_frequency
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_CLOCK_FREQUENCY> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_CLOCK_FREQUENCY> and returns the result.
 =item $bitfield = $device->address_bits
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_ADDRESS_BITS> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_ADDRESS_BITS> and returns the result.
 =item $uint = $device->max_read_image_args
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_READ_IMAGE_ARGS> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_READ_IMAGE_ARGS> and returns the result.
 =item $uint = $device->max_write_image_args
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_WRITE_IMAGE_ARGS> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_WRITE_IMAGE_ARGS> and returns the result.
 =item $ulong = $device->max_mem_alloc_size
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_MEM_ALLOC_SIZE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_MEM_ALLOC_SIZE> and returns the result.
 =item $int = $device->image2d_max_width
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE2D_MAX_WIDTH> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE2D_MAX_WIDTH> and returns the result.
 =item $int = $device->image2d_max_height
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE2D_MAX_HEIGHT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE2D_MAX_HEIGHT> and returns the result.
 =item $int = $device->image3d_max_width
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE3D_MAX_WIDTH> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE3D_MAX_WIDTH> and returns the result.
 =item $int = $device->image3d_max_height
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE3D_MAX_HEIGHT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE3D_MAX_HEIGHT> and returns the result.
 =item $int = $device->image3d_max_depth
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE3D_MAX_DEPTH> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE3D_MAX_DEPTH> and returns the result.
 =item $uint = $device->image_support
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_IMAGE_SUPPORT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_IMAGE_SUPPORT> and returns the result.
 =item $int = $device->max_parameter_size
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_PARAMETER_SIZE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_PARAMETER_SIZE> and returns the result.
 =item $uint = $device->max_samplers
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_SAMPLERS> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_SAMPLERS> and returns the result.
 =item $uint = $device->mem_base_addr_align
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MEM_BASE_ADDR_ALIGN> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MEM_BASE_ADDR_ALIGN> and returns the result.
 =item $uint = $device->min_data_type_align_size
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MIN_DATA_TYPE_ALIGN_SIZE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MIN_DATA_TYPE_ALIGN_SIZE> and returns the result.
 =item $device_fp_config = $device->single_fp_config
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_SINGLE_FP_CONFIG> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_SINGLE_FP_CONFIG> and returns the result.
 =item $device_mem_cache_type = $device->global_mem_cache_type
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_GLOBAL_MEM_CACHE_TYPE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_GLOBAL_MEM_CACHE_TYPE> and returns the result.
 =item $uint = $device->global_mem_cacheline_size
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_GLOBAL_MEM_CACHELINE_SIZE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_GLOBAL_MEM_CACHELINE_SIZE> and returns the result.
 =item $ulong = $device->global_mem_cache_size
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_GLOBAL_MEM_CACHE_SIZE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_GLOBAL_MEM_CACHE_SIZE> and returns the result.
 =item $ulong = $device->global_mem_size
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_GLOBAL_MEM_SIZE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_GLOBAL_MEM_SIZE> and returns the result.
 =item $ulong = $device->max_constant_buffer_size
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_CONSTANT_BUFFER_SIZE> and returns the result.
 =item $uint = $device->max_constant_args
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_MAX_CONSTANT_ARGS> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_MAX_CONSTANT_ARGS> and returns the result.
 =item $device_local_mem_type = $device->local_mem_type
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_LOCAL_MEM_TYPE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_LOCAL_MEM_TYPE> and returns the result.
 =item $ulong = $device->local_mem_size
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_LOCAL_MEM_SIZE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_LOCAL_MEM_SIZE> and returns the result.
 =item $boolean = $device->error_correction_support
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_ERROR_CORRECTION_SUPPORT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_ERROR_CORRECTION_SUPPORT> and returns the result.
 =item $int = $device->profiling_timer_resolution
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PROFILING_TIMER_RESOLUTION> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PROFILING_TIMER_RESOLUTION> and returns the result.
 =item $boolean = $device->endian_little
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_ENDIAN_LITTLE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_ENDIAN_LITTLE> and returns the result.
 =item $boolean = $device->available
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_AVAILABLE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_AVAILABLE> and returns the result.
 =item $boolean = $device->compiler_available
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_COMPILER_AVAILABLE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_COMPILER_AVAILABLE> and returns the result.
 =item $device_exec_capabilities = $device->execution_capabilities
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_EXECUTION_CAPABILITIES> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_EXECUTION_CAPABILITIES> and returns the result.
 =item $command_queue_properties = $device->properties
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_QUEUE_PROPERTIES> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_QUEUE_PROPERTIES> and returns the result.
 =item $ = $device->platform
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PLATFORM> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PLATFORM> and returns the result.
 =item $string = $device->name
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_NAME> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NAME> and returns the result.
 =item $string = $device->vendor
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_VENDOR> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_VENDOR> and returns the result.
 =item $string = $device->driver_version
-Calls C<clGetDeviceInfo> with C<CL_DRIVER_VERSION> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DRIVER_VERSION> and returns the result.
 =item $string = $device->profile
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PROFILE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PROFILE> and returns the result.
 =item $string = $device->version
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_VERSION> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_VERSION> and returns the result.
 =item $string = $device->extensions
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_EXTENSIONS> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_EXTENSIONS> and returns the result.
 =item $uint = $device->preferred_vector_width_half
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PREFERRED_VECTOR_WIDTH_HALF> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PREFERRED_VECTOR_WIDTH_HALF> and returns the result.
 =item $uint = $device->native_vector_width_char
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_CHAR> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_CHAR> and returns the result.
 =item $uint = $device->native_vector_width_short
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_SHORT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_SHORT> and returns the result.
 =item $uint = $device->native_vector_width_int
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_INT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_INT> and returns the result.
 =item $uint = $device->native_vector_width_long
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_LONG> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_LONG> and returns the result.
 =item $uint = $device->native_vector_width_float
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_FLOAT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_FLOAT> and returns the result.
 =item $uint = $device->native_vector_width_double
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_DOUBLE> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_DOUBLE> and returns the result.
 =item $uint = $device->native_vector_width_half
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_NATIVE_VECTOR_WIDTH_HALF> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_NATIVE_VECTOR_WIDTH_HALF> and returns the result.
 =item $device_fp_config = $device->double_fp_config
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_DOUBLE_FP_CONFIG> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_DOUBLE_FP_CONFIG> and returns the result.
 =item $device_fp_config = $device->half_fp_config
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_HALF_FP_CONFIG> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_HALF_FP_CONFIG> and returns the result.
 =item $boolean = $device->host_unified_memory
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_HOST_UNIFIED_MEMORY> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_HOST_UNIFIED_MEMORY> and returns the result.
 =item $device = $device->parent_device_ext
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PARENT_DEVICE_EXT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PARENT_DEVICE_EXT> and returns the result.
 =item @device_partition_property_exts = $device->partition_types_ext
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PARTITION_TYPES_EXT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PARTITION_TYPES_EXT> and returns the result.
 =item @device_partition_property_exts = $device->affinity_domains_ext
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_AFFINITY_DOMAINS_EXT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_AFFINITY_DOMAINS_EXT> and returns the result.
 =item $uint = $device->reference_count_ext
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_REFERENCE_COUNT_EXT > and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_REFERENCE_COUNT_EXT> and returns the result.
 =item @device_partition_property_exts = $device->partition_style_ext
-Calls C<clGetDeviceInfo> with C<CL_DEVICE_PARTITION_STYLE_EXT> and returns the result.
+Calls C<clGetDeviceInfo> with C<OpenCL::DEVICE_PARTITION_STYLE_EXT> and returns the result.
 =for gengetinfo end device
 =back
 =head2 THE OpenCL::Context CLASS
+An OpenCL::Context is basically a container, or manager, for a number of
+devices of a platform. It is used to create all sorts of secondary objects
+such as buffers, queues, programs and so on.
+All context creation functions and methods take a list of properties
+(type-value pairs). All property values can be specified as integers -
+some additionally support other types:
 =over 4
+=item OpenCL::CONTEXT_PLATFORM
+Also accepts OpenCL::Platform objects.
+=item OpenCL::GLX_DISPLAY_KHR
+Also accepts C<undef>, in which case a deep and troubling hack is engaged
+to find the current glx display (see L<GLX SUPPORT>).
+=item OpenCL::GL_CONTEXT_KHR
+Also accepts C<undef>, in which case a deep and troubling hack is engaged
+to find the current glx context (see L<GLX SUPPORT>).
+=back
+=over 4
+=item $prog = $ctx->build_program ($program, $options = "")
+This convenience function tries to build the program on all devices in
+the context. If the build fails, then the function will C<croak> with the
+build log. Otherwise ti returns the program object.
+The C<$program> can either be a C<OpenCL::Program> object or a string
+containing the program. In the latter case, a program objetc will be
+created automatically.
+=cut
+sub OpenCL::Context::build_program {
+   my ($self, $prog, $options) = @_;
+   $prog = $self->program_with_source ($prog)
+      unless ref $prog;
+   eval { $prog->build (undef, $options); 1 }
+      or errno == BUILD_PROGRAM_FAILURE
+      or errno == INVALID_BINARY # workaround nvidia bug
+      or Carp::croak "OpenCL::Context->build_program: " . err2str;
+   # we check status for all devices
+   for my $dev ($self->devices) {
+      $prog->build_status ($dev) == BUILD_SUCCESS
+         or Carp::croak "Building OpenCL program for device '" . $dev->name . "' failed:\n"
+                        . $prog->build_log ($dev);
+   }
+   $prog
+}
 =item $queue = $ctx->queue ($device, $properties)
 Create a new OpenCL::Queue object from the context and the given device.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateCommandQueue.html>
+Example: create an out-of-order queue.
+   $queue = $ctx->queue ($device, OpenCL::QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE);
 =item $ev = $ctx->user_event
 Creates a new OpenCL::UserEvent object.
 =item $buf = $ctx->buffer ($flags, $len)
 Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object with the
 given flags and octet-size.
+flags: OpenCL::MEM_READ_WRITE, OpenCL::MEM_WRITE_ONLY, OpenCL::MEM_READ_ONLY,
+OpenCL::MEM_USE_HOST_PTR, OpenCL::MEM_ALLOC_HOST_PTR, OpenCL::MEM_COPY_HOST_PTR,
+OpenCL::MEM_HOST_WRITE_ONLY, OpenCL::MEM_HOST_READ_ONLY, OpenCL::MEM_HOST_NO_ACCESS.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateBuffer.html>
 =item $buf = $ctx->buffer_sv ($flags, $data)
 Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object and
 initialise it with the given data values.
+=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)
+Creates a new OpenCL::Image object and optionally initialises it with
+the given data values.
+channel_order: OpenCL::R, OpenCL::A, OpenCL::RG, OpenCL::RA, OpenCL::RGB,
+OpenCL::RGBA, OpenCL::BGRA, OpenCL::ARGB, OpenCL::INTENSITY, OpenCL::LUMINANCE,
+OpenCL::Rx, OpenCL::RGx, OpenCL::RGBx.
+channel_type: OpenCL::SNORM_INT8, OpenCL::SNORM_INT16, OpenCL::UNORM_INT8,
+OpenCL::UNORM_INT16, OpenCL::UNORM_SHORT_565, OpenCL::UNORM_SHORT_555,
+OpenCL::UNORM_INT_101010, OpenCL::SIGNED_INT8, OpenCL::SIGNED_INT16,
+OpenCL::SIGNED_INT32, OpenCL::UNSIGNED_INT8, OpenCL::UNSIGNED_INT16,
+OpenCL::UNSIGNED_INT32, OpenCL::HALF_FLOAT, OpenCL::FLOAT.
+type: OpenCL::MEM_OBJECT_BUFFER, OpenCL::MEM_OBJECT_IMAGE2D,
+OpenCL::MEM_OBJECT_IMAGE3D, OpenCL::MEM_OBJECT_IMAGE2D_ARRAY,
+OpenCL::MEM_OBJECT_IMAGE1D, OpenCL::MEM_OBJECT_IMAGE1D_ARRAY,
+OpenCL::MEM_OBJECT_IMAGE1D_BUFFER.
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateImage.html>
 =item $img = $ctx->image2d ($flags, $channel_order, $channel_type, $width, $height, $row_pitch = 0, $data = undef)
 Creates a new OpenCL::Image2D object and optionally initialises it with
 the given data values.
 Creates a new OpenCL::Image3D object and optionally initialises it with
 the given data values.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateImage3D.html>
+=item $buffer = $ctx->gl_buffer ($flags, $bufobj)
+Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object that refers to the given
+OpenGL buffer object.
+flags: OpenCL::MEM_READ_WRITE, OpenCL::MEM_READ_ONLY, OpenCL::MEM_WRITE_ONLY.
+http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLBuffer.html
+=item $img = $ctx->gl_texture ($flags, $target, $miplevel, $texture)
+Creates a new OpenCL::Image object that refers to the given OpenGL
+texture object or buffer.
+target: GL_TEXTURE_1D, GL_TEXTURE_1D_ARRAY, GL_TEXTURE_BUFFER,
+GL_TEXTURE_2D, GL_TEXTURE_2D_ARRAY, GL_TEXTURE_3D,
+GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
+GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
+GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
+GL_TEXTURE_RECTANGLE/GL_TEXTURE_RECTANGLE_ARB.
+http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateFromGLTexture.html
+=item $img = $ctx->gl_texture2d ($flags, $target, $miplevel, $texture)
+Creates a new OpenCL::Image2D object that refers to the given OpenGL
+2D texture object.
+http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLTexture2D.html
+=item $img = $ctx->gl_texture3d ($flags, $target, $miplevel, $texture)
+Creates a new OpenCL::Image3D object that refers to the given OpenGL
+3D texture object.
+http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLTexture3D.html
+=item $ctx->gl_renderbuffer ($flags, $renderbuffer)
+Creates a new OpenCL::Image2D object that refers to the given OpenGL
+render buffer.
+http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFromGLRenderbuffer.html
 =item @formats = $ctx->supported_image_formats ($flags, $image_type)
 Returns a list of matching image formats - each format is an arrayref with
 two values, $channel_order and $channel_type, in it.
 =item $sampler = $ctx->sampler ($normalized_coords, $addressing_mode, $filter_mode)
 Creates a new OpenCL::Sampler object.
+addressing_mode: OpenCL::ADDRESS_NONE, OpenCL::ADDRESS_CLAMP_TO_EDGE,
+OpenCL::ADDRESS_CLAMP, OpenCL::ADDRESS_REPEAT, OpenCL::ADDRESS_MIRRORED_REPEAT.
+filter_mode: OpenCL::FILTER_NEAREST, OpenCL::FILTER_LINEAR.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateSampler.html>
 =item $program = $ctx->program_with_source ($string)
 Creates a new OpenCL::Program object from the given source code.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateProgramWithSource.html>
+=item ($program, \@status) = $ctx->program_with_binary (\@devices, \@binaries)
+Creates a new OpenCL::Program object from the given binaries.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateProgramWithBinary.html>
+Example: clone an existing program object that contains a successfully
+compiled program, no matter how useless this is.
+   my $clone = $ctx->program_with_binary ([$prog->devices], [$prog->binaries]);
+=item $program = $ctx->program_with_built_in_kernels (\@devices, $kernel_names)
+Creates a new OpenCL::Program object from the given built-in kernel names.
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCreateProgramWithBuiltInKernels.html>
+=item $program = $ctx->link_program (\@devices, $options, \@programs, $cb->($program) = undef)
+Links all (already compiled) program objects specified in C<@programs>
+together and returns a new OpenCL::Program object with the result.
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clLinkProgram.html>
 =item $packed_value = $ctx->info ($name)
 See C<< $platform->info >> for details.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetContextInfo.html>
 =for gengetinfo begin context
 =item $uint = $context->reference_count
-Calls C<clGetContextInfo> with C<CL_CONTEXT_REFERENCE_COUNT> and returns the result.
+Calls C<clGetContextInfo> with C<OpenCL::CONTEXT_REFERENCE_COUNT> and returns the result.
 =item @devices = $context->devices
-Calls C<clGetContextInfo> with C<CL_CONTEXT_DEVICES> and returns the result.
+Calls C<clGetContextInfo> with C<OpenCL::CONTEXT_DEVICES> and returns the result.
 =item @property_ints = $context->properties
-Calls C<clGetContextInfo> with C<CL_CONTEXT_PROPERTIES> and returns the result.
+Calls C<clGetContextInfo> with C<OpenCL::CONTEXT_PROPERTIES> and returns the result.
 =item $uint = $context->num_devices
-Calls C<clGetContextInfo> with C<CL_CONTEXT_NUM_DEVICES> and returns the result.
+Calls C<clGetContextInfo> with C<OpenCL::CONTEXT_NUM_DEVICES> and returns the result.
 =for gengetinfo end context
 =back
 =head2 THE OpenCL::Queue CLASS
 An OpenCL::Queue represents an execution queue for OpenCL. You execute
-requests by calling their respective C<enqueue_xxx> method and waitinf for
+requests by calling their respective method and waiting for it to complete
-it to complete in some way.
+in some way.
-All the enqueue methods return an event object that can be used to wait
+Most methods that enqueue some request return an event object that can
-for completion, unless the method is called in void context, in which case
+be used to wait for completion (optionally using a callback), unless
-no event object is created.
+the method is called in void context, in which case no event object is
+created.
 They also allow you to specify any number of other event objects that this
 request has to wait for before it starts executing, by simply passing the
-event objects as extra parameters to the enqueue methods.
+event objects as extra parameters to the enqueue methods. To simplify
+program design, this module ignores any C<undef> values in the list of
+events. This makes it possible to code operations such as this, without
+having to put a valid event object into C<$event> first:
+   $event = $queue->xxx (..., $event);
 Queues execute in-order by default, without any parallelism, so in most
 cases (i.e. you use only one queue) it's not necessary to wait for or
-create event objects.
+create event objects, althoguh an our of order queue is often a bit
+faster.
 =over 4
-=item $ev = $queue->enqueue_read_buffer ($buffer, $blocking, $offset, $len, $data, $wait_events...)
+=item $ev = $queue->read_buffer ($buffer, $blocking, $offset, $len, $data, $wait_events...)
 Reads data from buffer into the given string.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBuffer.html>
-=item $ev = $queue->enqueue_write_buffer ($buffer, $blocking, $offset, $data, $wait_events...)
+=item $ev = $queue->write_buffer ($buffer, $blocking, $offset, $data, $wait_events...)
 Writes data to buffer from the given string.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBuffer.html>
-=item $ev = $queue->enqueue_copy_buffer ($src, $dst, $src_offset, $dst_offset, $len, $wait_events...)
+=item $ev = $queue->copy_buffer ($src, $dst, $src_offset, $dst_offset, $len, $wait_events...)
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBuffer.html>
-=item $ev = $queue->enqueue_read_buffer_rect (OpenCL::Memory buf, cl_bool blocking, $buf_x, $buf_y, $buf_z, $host_x, $host_y, $host_z, $width, $height, $depth, $buf_row_pitch, $buf_slice_pitch, $host_row_pitch, $host_slice_pitch, $data, $wait_events...)
+=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...)
 http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBufferRect.html
-=item $ev = $queue->enqueue_write_buffer_rect (OpenCL::Memory buf, cl_bool blocking, $buf_x, $buf_y, $buf_z, $host_x, $host_y, $host_z, $width, $height, $depth, $buf_row_pitch, $buf_slice_pitch, $host_row_pitch, $host_slice_pitch, $data, $wait_events...)
+=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...)
 http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteBufferRect.html
-=item $ev = $queue->enqueue_read_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)
-L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferRect.html>
-=item $ev = $queue->enqueue_copy_buffer_to_image ($src_buffer, $dst_image, $src_offset, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)
+=item $ev = $queue->copy_buffer_to_image ($src_buffer, $dst_image, $src_offset, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferToImage.html>
+=item $ev = $queue->read_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)
+C<$row_pitch> (and C<$slice_pitch>) can be C<0>, in which case the OpenCL
+module uses the image width (and height) to supply default values.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadImage.html>
-=item $ev = $queue->enqueue_write_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)
+=item $ev = $queue->write_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...)
+C<$row_pitch> (and C<$slice_pitch>) can be C<0>, in which case the OpenCL
+module uses the image width (and height) to supply default values.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWriteImage.html>
-=item $ev = $queue->enqueue_copy_image ($src_image, $dst_image, $src_x, $src_y, $src_z, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...)
+=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...)
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImage.html>
-=item $ev = $queue->enqueue_copy_image_to_buffer ($src_image, $dst_image, $src_x, $src_y, $src_z, $width, $height, $depth, $dst_offset, $wait_events...)
+=item $ev = $queue->copy_image_to_buffer ($src_image, $dst_image, $src_x, $src_y, $src_z, $width, $height, $depth, $dst_offset, $wait_events...)
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyImageToBuffer.html>
-=item $ev = $queue->enqueue_copy_buffer_rect ($src, $dst, $src_x, $src_y, $src_z, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $src_row_pitch, $src_slice_pitch, $dst_row_pitch, $dst_slice_pitch, $wait_event...)
+=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...)
 Yeah.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueCopyBufferToImage.html>.
+=item $ev = $queue->fill_buffer ($mem, $pattern, $offset, $size, ...)
+Fills the given buffer object with repeated applications of C<$pattern>,
+starting at C<$offset> for C<$size> octets.
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueFillBuffer.html>
+=item $ev = $queue->fill_image ($img, $r, $g, $b, $a, $x, $y, $z, $width, $height, $depth, ...)
+Fills the given image area with the given rgba colour components. The
+components are normally floating point values between C<0> and C<1>,
+except when the image channel data type is a signe dor unsigned
+unnormalised format, in which case the range is determined by the format.
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueFillImage.html>
-=item $ev = $queue->enqueue_task ($kernel, $wait_events...)
+=item $ev = $queue->task ($kernel, $wait_events...)
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueTask.html>
-=item $ev = $queue->enqueue_nd_range_kernel ($kernel, @$global_work_offset, @$global_work_size, @$local_work_size, $wait_events...)
+=item $ev = $queue->nd_range_kernel ($kernel, \@global_work_offset, \@global_work_size, \@local_work_size, $wait_events...)
 Enqueues a kernel execution.
-@$global_work_size must be specified as a reference to an array of
+\@global_work_size must be specified as a reference to an array of
 integers specifying the work sizes (element counts).
-@$global_work_offset must be either C<undef> (in which case all offsets
+\@global_work_offset must be either C<undef> (in which case all offsets
 are C<0>), or a reference to an array of work offsets, with the same number
-of elements as @$global_work_size.
+of elements as \@global_work_size.
-@$local_work_size must be either C<undef> (in which case the
+\@local_work_size must be either C<undef> (in which case the
 implementation is supposed to choose good local work sizes), or a
 reference to an array of local work sizes, with the same number of
-elements as @$global_work_size.
+elements as \@global_work_size.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueNDRangeKernel.html>
-=item $ev = $queue->enqueue_marker
+=item $ev = $queue->migrate_mem_objects (\@mem_objects, $flags, $wait_events...)
+Migrates a number of OpenCL::Memory objects to or from the device.
+flags: OpenCL::MIGRATE_MEM_OBJECT_HOST, OpenCL::MIGRATE_MEM_OBJECT_CONTENT_UNDEFINED
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueMigrateMemObjects.html>
+=item $ev = $queue->acquire_gl_objects ([object, ...], $wait_events...)
+Enqueues a list (an array-ref of OpenCL::Memory objects) to be acquired
+for subsequent OpenCL usage.
-L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueMarker.html>
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueAcquireGLObjects.html>
+=item $ev = $queue->release_gl_objects ([object, ...], $wait_events...)
+Enqueues a list (an array-ref of OpenCL::Memory objects) to be released
+for subsequent OpenGL usage.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReleaseGLObjects.html>
-=item $ev = $queue->enqueue_wait_for_events ($wait_events...)
+=item $ev = $queue->wait_for_events ($wait_events...)
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueWaitForEvents.html>
-=item $queue->enqueue_barrier
+=item $ev = $queue->marker ($wait_events...)
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueMarkerWithWaitList.html>
+=item $ev = $queue->barrier ($wait_events...)
-L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueBarrier.html>
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clEnqueueBarrierWithWaitList.html>
 =item $queue->flush
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clFlush.html>
 =for gengetinfo begin command_queue
 =item $ctx = $command_queue->context
-Calls C<clGetCommandQueueInfo> with C<CL_QUEUE_CONTEXT> and returns the result.
+Calls C<clGetCommandQueueInfo> with C<OpenCL::QUEUE_CONTEXT> and returns the result.
 =item $device = $command_queue->device
-Calls C<clGetCommandQueueInfo> with C<CL_QUEUE_DEVICE> and returns the result.
+Calls C<clGetCommandQueueInfo> with C<OpenCL::QUEUE_DEVICE> and returns the result.
 =item $uint = $command_queue->reference_count
-Calls C<clGetCommandQueueInfo> with C<CL_QUEUE_REFERENCE_COUNT> and returns the result.
+Calls C<clGetCommandQueueInfo> with C<OpenCL::QUEUE_REFERENCE_COUNT> and returns the result.
 =item $command_queue_properties = $command_queue->properties
-Calls C<clGetCommandQueueInfo> with C<CL_QUEUE_PROPERTIES> and returns the result.
+Calls C<clGetCommandQueueInfo> with C<OpenCL::QUEUE_PROPERTIES> and returns the result.
 =for gengetinfo end command_queue
+=back
+=head3 MEMORY MAPPED BUFFERS
+OpenCL allows you to map buffers and images to host memory (read: perl
+scalars). This is done much like reading or copying a buffer, by enqueuing
+a map or unmap operation on the command queue.
+The map operations return an C<OpenCL::Mapped> object - see L<THE
+OpenCL::Mapped CLASS> section for details on what to do with these
+objects.
+The object will be unmapped automatically when the mapped object is
+destroyed (you can use a barrier to make sure the unmap has finished,
+before using the buffer in a kernel), but you can also enqueue an unmap
+operation manually.
+=over 4
+=item $mapped_buffer = $queue->map_buffer ($buf, $blocking=1, $map_flags=OpenCL::MAP_READ|OpenCL::MAP_WRITE, $offset=0, $size=undef, $wait_events...)
+Maps the given buffer into host memory and returns an
+C<OpenCL::MappedBuffer> object. If C<$size> is specified as undef, then
+the map will extend to the end of the buffer.
+map_flags: OpenCL::MAP_READ, OpenCL::MAP_WRITE, OpenCL::MAP_WRITE_INVALIDATE_REGION.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueMapBuffer.html>
+Example: map the buffer $buf fully and replace the first 4 bytes by "abcd", then unmap.
+   {
+     my $mapped = $queue->map_buffer ($buf, 1, OpenCL::MAP_WRITE);
+     substr $$mapped, 0, 4, "abcd";
+   } # asynchronously unmap because $mapped is destroyed
+=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...)
+Maps the given image area into host memory and return an
+C<OpenCL::MappedImage> object.
+If any of C<$width>, C<$height> and/or C<$depth> are C<undef> then they
+will be replaced by the maximum possible value.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueMapImage.html>
+Example: map an image (with OpenCL::UNSIGNED_INT8 channel type) and set
+the first channel of the leftmost column to 5, then explicitly unmap
+it. You are not necessarily meant to do it this way, this example just
+shows you the accessors to use :)
+   my $mapped = $queue->map_image ($image, 1, OpenCL::MAP_WRITE);
+   $mapped->set ($_ * $mapped->row_pitch, pack "C", 5)
+      for 0..$image->height;
+   $mapped->unmap;.
+   $mapped->wait; # only needed for out of order queues normally
+=item $ev = $queue->unmap ($mapped, $wait_events...)
+Unmaps the data from host memory. You must not call any methods that
+modify the data, or modify the data scalar directly, after calling this
+method.
+The mapped event object will always be passed as part of the
+$wait_events. The mapped event object will be replaced by the new event
+object that this request creates.
 =back
 =head2 THE OpenCL::Memory CLASS
 =for gengetinfo begin mem
 =item $mem_object_type = $mem->type
-Calls C<clGetMemObjectInfo> with C<CL_MEM_TYPE> and returns the result.
+Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_TYPE> and returns the result.
 =item $mem_flags = $mem->flags
-Calls C<clGetMemObjectInfo> with C<CL_MEM_FLAGS> and returns the result.
+Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_FLAGS> and returns the result.
 =item $int = $mem->size
-Calls C<clGetMemObjectInfo> with C<CL_MEM_SIZE> and returns the result.
+Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_SIZE> and returns the result.
 =item $ptr_value = $mem->host_ptr
-Calls C<clGetMemObjectInfo> with C<CL_MEM_HOST_PTR> and returns the result.
+Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_HOST_PTR> and returns the result.
 =item $uint = $mem->map_count
-Calls C<clGetMemObjectInfo> with C<CL_MEM_MAP_COUNT> and returns the result.
+Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_MAP_COUNT> and returns the result.
 =item $uint = $mem->reference_count
-Calls C<clGetMemObjectInfo> with C<CL_MEM_REFERENCE_COUNT> and returns the result.
+Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_REFERENCE_COUNT> and returns the result.
 =item $ctx = $mem->context
-Calls C<clGetMemObjectInfo> with C<CL_MEM_CONTEXT> and returns the result.
+Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_CONTEXT> and returns the result.
 =item $mem = $mem->associated_memobject
-Calls C<clGetMemObjectInfo> with C<CL_MEM_ASSOCIATED_MEMOBJECT> and returns the result.
+Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_ASSOCIATED_MEMOBJECT> and returns the result.
 =item $int = $mem->offset
-Calls C<clGetMemObjectInfo> with C<CL_MEM_OFFSET> and returns the result.
+Calls C<clGetMemObjectInfo> with C<OpenCL::MEM_OFFSET> and returns the result.
 =for gengetinfo end mem
+=item ($type, $name) = $mem->gl_object_info
+Returns the OpenGL object type (e.g. OpenCL::GL_OBJECT_TEXTURE2D) and the
+object "name" (e.g. the texture name) used to create this memory object.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetGLObjectInfo.html>
 =back
 =head2 THE OpenCL::Buffer CLASS
 =back
 =head2 THE OpenCL::Image CLASS
-This is the superclass of all image objects - OpenCL::Image2D and OpenCL::Image3D.
+This is the superclass of all image objects - OpenCL::Image1D,
+OpenCL::Image1DArray, OpenCL::Image1DBuffer, OpenCL::Image2D,
+OpenCL::Image2DArray and OpenCL::Image3D.
 =over 4
-=item $packed_value = $ev->image_info ($name)
+=item $packed_value = $image->image_info ($name)
 See C<< $platform->info >> for details.
 The reason this method is not called C<info> is that there already is an
 C<< ->info >> method inherited from C<OpenCL::Memory>.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetImageInfo.html>
+=item ($channel_order, $channel_data_type) = $image->format
+Returns the channel order and type used to create the image by calling
+C<clGetImageInfo> with C<CL_IMAGE_FORMAT>.
 =for gengetinfo begin image
 =item $int = $image->element_size
-Calls C<clGetImageInfo> with C<CL_IMAGE_ELEMENT_SIZE> and returns the result.
+Calls C<clGetImageInfo> with C<OpenCL::IMAGE_ELEMENT_SIZE> and returns the result.
 =item $int = $image->row_pitch
-Calls C<clGetImageInfo> with C<CL_IMAGE_ROW_PITCH> and returns the result.
+Calls C<clGetImageInfo> with C<OpenCL::IMAGE_ROW_PITCH> and returns the result.
 =item $int = $image->slice_pitch
-Calls C<clGetImageInfo> with C<CL_IMAGE_SLICE_PITCH> and returns the result.
+Calls C<clGetImageInfo> with C<OpenCL::IMAGE_SLICE_PITCH> and returns the result.
 =item $int = $image->width
-Calls C<clGetImageInfo> with C<CL_IMAGE_WIDTH> and returns the result.
+Calls C<clGetImageInfo> with C<OpenCL::IMAGE_WIDTH> and returns the result.
 =item $int = $image->height
-Calls C<clGetImageInfo> with C<CL_IMAGE_HEIGHT> and returns the result.
+Calls C<clGetImageInfo> with C<OpenCL::IMAGE_HEIGHT> and returns the result.
 =item $int = $image->depth
-Calls C<clGetImageInfo> with C<CL_IMAGE_DEPTH> and returns the result.
+Calls C<clGetImageInfo> with C<OpenCL::IMAGE_DEPTH> and returns the result.
 =for gengetinfo end image
+=for gengetinfo begin gl_texture
+=item $GLenum = $gl_texture->target
+Calls C<clGetGLTextureInfo> with C<OpenCL::GL_TEXTURE_TARGET> and returns the result.
+=item $GLint = $gl_texture->gl_mipmap_level
+Calls C<clGetGLTextureInfo> with C<OpenCL::GL_MIPMAP_LEVEL> and returns the result.
+=for gengetinfo end gl_texture
 =back
 =head2 THE OpenCL::Sampler CLASS
 =over 4
 =for gengetinfo begin sampler
 =item $uint = $sampler->reference_count
-Calls C<clGetSamplerInfo> with C<CL_SAMPLER_REFERENCE_COUNT> and returns the result.
+Calls C<clGetSamplerInfo> with C<OpenCL::SAMPLER_REFERENCE_COUNT> and returns the result.
 =item $ctx = $sampler->context
-Calls C<clGetSamplerInfo> with C<CL_SAMPLER_CONTEXT> and returns the result.
+Calls C<clGetSamplerInfo> with C<OpenCL::SAMPLER_CONTEXT> and returns the result.
 =item $addressing_mode = $sampler->normalized_coords
-Calls C<clGetSamplerInfo> with C<CL_SAMPLER_NORMALIZED_COORDS> and returns the result.
+Calls C<clGetSamplerInfo> with C<OpenCL::SAMPLER_NORMALIZED_COORDS> and returns the result.
 =item $filter_mode = $sampler->addressing_mode
-Calls C<clGetSamplerInfo> with C<CL_SAMPLER_ADDRESSING_MODE> and returns the result.
+Calls C<clGetSamplerInfo> with C<OpenCL::SAMPLER_ADDRESSING_MODE> and returns the result.
 =item $boolean = $sampler->filter_mode
-Calls C<clGetSamplerInfo> with C<CL_SAMPLER_FILTER_MODE> and returns the result.
+Calls C<clGetSamplerInfo> with C<OpenCL::SAMPLER_FILTER_MODE> and returns the result.
 =for gengetinfo end sampler
 =back
 =head2 THE OpenCL::Program CLASS
 =over 4
-=item $program->build ($device, $options = "")
+=item $program->build (\@devices = undef, $options = "", $cb->($program) = undef)
-Tries to build the program with the givne options.
+Tries to build the program with the given options. See also the
+C<$ctx->build> convenience function.
+If a callback is specified, then it will be called when compilation is
+finished. Note that many OpenCL implementations block your program while
+compiling whether you use a callback or not. See C<build_async> if you
+want to make sure the build is done in the background.
+Note that some OpenCL implementations act up badly, and don't call the
+callback in some error cases (but call it in others). This implementation
+assumes the callback will always be called, and leaks memory if this is
+not so. So best make sure you don't pass in invalid values.
+Some implementations fail with C<OpenCL::INVALID_BINARY> when the
+compilation state is successful but some later stage fails.
+options: C<-D name>, C<-D name=definition>, C<-I dir>,
+C<-cl-single-precision-constant>, C<-cl-denorms-are-zero>,
+C<-cl-fp32-correctly-rounded-divide-sqrt>, C<-cl-opt-disable>,
+C<-cl-mad-enable>, C<-cl-no-signed-zeros>, C<-cl-unsafe-math-optimizations>,
+C<-cl-finite-math-only>, C<-cl-fast-relaxed-math>,
+C<-w>, C<-Werror>, C<-cl-std=CL1.1/CL1.2>, C<-cl-kernel-arg-info>,
+C<-create-library>, C<-enable-link-options>.
+build_status: OpenCL::BUILD_SUCCESS, OpenCL::BUILD_NONE,
+OpenCL::BUILD_ERROR, OpenCL::BUILD_IN_PROGRESS.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clBuildProgram.html>
+=item $program->build_async (\@devices = undef, $options = "", $cb->($program) = undef)
+Similar to C<< ->build >>, except it starts a thread, and never fails (you
+need to check the compilation status form the callback, or by polling).
+=item $program->compile (\@devices = undef, $options = "", \%headers = undef, $cb->($program) = undef)
+Compiles the given program for the given devices (or all devices if
+undef). If C<$headers> is given, it must be a hashref with include name =>
+OpenCL::Program pairs.
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clCompileProgram.html>
 =item $packed_value = $program->build_info ($device, $name)
 Similar to C<< $platform->info >>, but returns build info for a previous
 build attempt for the given device.
 Creates an OpenCL::Kernel object out of the named C<__kernel> function in
 the program.
 L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateKernel.html>
+=item @kernels = $program->kernels_in_program
+Returns all kernels successfully compiled for all devices in program.
+http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateKernelsInProgram.html
 =for gengetinfo begin program_build
 =item $build_status = $program->build_status ($device)
-Calls C<clGetProgramBuildInfo> with C<CL_PROGRAM_BUILD_STATUS> and returns the result.
+Calls C<clGetProgramBuildInfo> with C<OpenCL::PROGRAM_BUILD_STATUS> and returns the result.
 =item $string = $program->build_options ($device)
-Calls C<clGetProgramBuildInfo> with C<CL_PROGRAM_BUILD_OPTIONS> and returns the result.
+Calls C<clGetProgramBuildInfo> with C<OpenCL::PROGRAM_BUILD_OPTIONS> and returns the result.
 =item $string = $program->build_log ($device)
-Calls C<clGetProgramBuildInfo> with C<CL_PROGRAM_BUILD_LOG> and returns the result.
+Calls C<clGetProgramBuildInfo> with C<OpenCL::PROGRAM_BUILD_LOG> and returns the result.
 =for gengetinfo end program_build
 =item $packed_value = $program->info ($name)
 =for gengetinfo begin program
 =item $uint = $program->reference_count
-Calls C<clGetProgramInfo> with C<CL_PROGRAM_REFERENCE_COUNT> and returns the result.
+Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_REFERENCE_COUNT> and returns the result.
 =item $ctx = $program->context
-Calls C<clGetProgramInfo> with C<CL_PROGRAM_CONTEXT> and returns the result.
+Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_CONTEXT> and returns the result.
 =item $uint = $program->num_devices
-Calls C<clGetProgramInfo> with C<CL_PROGRAM_NUM_DEVICES> and returns the result.
+Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_NUM_DEVICES> and returns the result.
 =item @devices = $program->devices
-Calls C<clGetProgramInfo> with C<CL_PROGRAM_DEVICES> and returns the result.
+Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_DEVICES> and returns the result.
 =item $string = $program->source
-Calls C<clGetProgramInfo> with C<CL_PROGRAM_SOURCE> and returns the result.
+Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_SOURCE> and returns the result.
 =item @ints = $program->binary_sizes
-Calls C<clGetProgramInfo> with C<CL_PROGRAM_BINARY_SIZES> and returns the result.
+Calls C<clGetProgramInfo> with C<OpenCL::PROGRAM_BINARY_SIZES> and returns the result.
 =for gengetinfo end program
 =item @blobs = $program->binaries
 =for gengetinfo begin kernel
 =item $string = $kernel->function_name
-Calls C<clGetKernelInfo> with C<CL_KERNEL_FUNCTION_NAME> and returns the result.
+Calls C<clGetKernelInfo> with C<OpenCL::KERNEL_FUNCTION_NAME> and returns the result.
 =item $uint = $kernel->num_args
-Calls C<clGetKernelInfo> with C<CL_KERNEL_NUM_ARGS> and returns the result.
+Calls C<clGetKernelInfo> with C<OpenCL::KERNEL_NUM_ARGS> and returns the result.
 =item $uint = $kernel->reference_count
-Calls C<clGetKernelInfo> with C<CL_KERNEL_REFERENCE_COUNT> and returns the result.
+Calls C<clGetKernelInfo> with C<OpenCL::KERNEL_REFERENCE_COUNT> and returns the result.
 =item $ctx = $kernel->context
-Calls C<clGetKernelInfo> with C<CL_KERNEL_CONTEXT> and returns the result.
+Calls C<clGetKernelInfo> with C<OpenCL::KERNEL_CONTEXT> and returns the result.
 =item $program = $kernel->program
-Calls C<clGetKernelInfo> with C<CL_KERNEL_PROGRAM> and returns the result.
+Calls C<clGetKernelInfo> with C<OpenCL::KERNEL_PROGRAM> and returns the result.
 =for gengetinfo end kernel
 =item $packed_value = $kernel->work_group_info ($device, $name)
+See C<< $platform->info >> for details.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetKernelWorkGroupInfo.html>
+=for gengetinfo begin kernel_work_group
+=item $int = $kernel->work_group_size ($device)
+Calls C<clGetKernelWorkGroupInfo> with C<OpenCL::KERNEL_WORK_GROUP_SIZE> and returns the result.
+=item @ints = $kernel->compile_work_group_size ($device)
+Calls C<clGetKernelWorkGroupInfo> with C<OpenCL::KERNEL_COMPILE_WORK_GROUP_SIZE> and returns the result.
+=item $ulong = $kernel->local_mem_size ($device)
+Calls C<clGetKernelWorkGroupInfo> with C<OpenCL::KERNEL_LOCAL_MEM_SIZE> and returns the result.
+=item $int = $kernel->preferred_work_group_size_multiple ($device)
+Calls C<clGetKernelWorkGroupInfo> with C<OpenCL::KERNEL_PREFERRED_WORK_GROUP_SIZE_MULTIPLE> and returns the result.
+=item $ulong = $kernel->private_mem_size ($device)
+Calls C<clGetKernelWorkGroupInfo> with C<OpenCL::KERNEL_PRIVATE_MEM_SIZE> and returns the result.
+=for gengetinfo end kernel_work_group
+=item $packed_value = $kernel->arg_info ($idx, $name)
+See C<< $platform->info >> for details.
+L<http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clGetKernelArgInfo.html>
+=for gengetinfo begin kernel_arg
+=item $kernel_arg_address_qualifier = $kernel->arg_address_qualifier ($idx)
+Calls C<clGetKernelArgInfo> with C<OpenCL::KERNEL_ARG_ADDRESS_QUALIFIER> and returns the result.
+=item $kernel_arg_access_qualifier = $kernel->arg_access_qualifier ($idx)
+Calls C<clGetKernelArgInfo> with C<OpenCL::KERNEL_ARG_ACCESS_QUALIFIER> and returns the result.
+=item $string = $kernel->arg_type_name ($idx)
+Calls C<clGetKernelArgInfo> with C<OpenCL::KERNEL_ARG_TYPE_NAME> and returns the result.
+=item $kernel_arg_type_qualifier = $kernel->arg_type_qualifier ($idx)
+Calls C<clGetKernelArgInfo> with C<OpenCL::KERNEL_ARG_TYPE_QUALIFIER> and returns the result.
+=item $string = $kernel->arg_name ($idx)
+Calls C<clGetKernelArgInfo> with C<OpenCL::KERNEL_ARG_NAME> and returns the result.
+=for gengetinfo end kernel_arg
+=item $kernel->setf ($format, ...)
+Sets the arguments of a kernel. Since OpenCL 1.1 doesn't have a generic
+way to set arguments (and with OpenCL 1.2 it might be rather slow), you
+need to specify a format argument, much as with C<printf>, to tell OpenCL
+what type of argument it is.
+The format arguments are single letters:
+   c   char
+   C   unsigned char
+   s   short
+   S   unsigned short
+   i   int
+   I   unsigned int
+   l   long
+   L   unsigned long
+   h   half float (0..65535)
+   f   float
+   d   double
+   z   local (octet size)
+   m   memory object (buffer or image)
+   a   sampler
+   e   event
+Space characters in the format string are ignored.
+Example: set the arguments for a kernel that expects an int, two floats, a buffer and an image.
+   $kernel->setf ("i ff mm", 5, 0.5, 3, $buffer, $image);
+=item $kernel->set_TYPE    ($index, $value)
+=item $kernel->set_char    ($index, $value)
+=item $kernel->set_uchar   ($index, $value)
+=item $kernel->set_short   ($index, $value)
+=item $kernel->set_ushort  ($index, $value)
+=item $kernel->set_int     ($index, $value)
+=item $kernel->set_uint    ($index, $value)
+=item $kernel->set_long    ($index, $value)
+=item $kernel->set_ulong   ($index, $value)
+=item $kernel->set_half    ($index, $value)
+=item $kernel->set_float   ($index, $value)
+=item $kernel->set_double  ($index, $value)
+=item $kernel->set_memory  ($index, $value)
+=item $kernel->set_buffer  ($index, $value)
+=item $kernel->set_image   ($index, $value)
+=item $kernel->set_sampler ($index, $value)
+=item $kernel->set_local   ($index, $value)
+=item $kernel->set_event   ($index, $value)
+This is a family of methods to set the kernel argument with the number
+C<$index> to the give C<$value>.
+Chars and integers (including the half type) are specified as integers,
+float and double as floating point values, memory/buffer/image must be
+an object of that type or C<undef>, local-memory arguments are set by
+specifying the size, and sampler and event must be objects of that type.
+Note that C<set_memory> works for all memory objects (all types of buffers
+and images) - the main purpose of the more specific C<set_TYPE> functions
+is type checking.
+Setting an argument for a kernel does NOT keep a reference to the object -
+for example, if you set an argument to some image object, free the image,
+and call the kernel, you will run into undefined behaviour.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetKernelArg.html>
+=back
+=head2 THE OpenCL::Event CLASS
+This is the superclass for all event objects (including OpenCL::UserEvent
+objects).
+=over 4
+=item $ev->wait
+Waits for the event to complete.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>
+=item $ev->cb ($exec_callback_type, $callback->($event, $event_command_exec_status))
+Adds a callback to the callback stack for the given event type. There is
+no way to remove a callback again.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetEventCallback.html>
+=item $packed_value = $ev->info ($name)
+See C<< $platform->info >> for details.
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetEventInfo.html>
+=for gengetinfo begin event
+=item $queue = $event->command_queue
+Calls C<clGetEventInfo> with C<OpenCL::EVENT_COMMAND_QUEUE> and returns the result.
+=item $command_type = $event->command_type
+Calls C<clGetEventInfo> with C<OpenCL::EVENT_COMMAND_TYPE> and returns the result.
+=item $uint = $event->reference_count
+Calls C<clGetEventInfo> with C<OpenCL::EVENT_REFERENCE_COUNT> and returns the result.
+=item $uint = $event->command_execution_status
+Calls C<clGetEventInfo> with C<OpenCL::EVENT_COMMAND_EXECUTION_STATUS> and returns the result.
+=item $ctx = $event->context
+Calls C<clGetEventInfo> with C<OpenCL::EVENT_CONTEXT> and returns the result.
+=for gengetinfo end event
+=item $packed_value = $ev->profiling_info ($name)
 See C<< $platform->info >> for details.
 The reason this method is not called C<info> is that there already is an
 C<< ->info >> method.
-L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetKernelWorkGroupInfo.html>
-=for gengetinfo begin kernel_work_group
-=item $int = $kernel->work_group_size ($device)
-Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_WORK_GROUP_SIZE> and returns the result.
-=item @ints = $kernel->compile_work_group_size ($device)
-Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_COMPILE_WORK_GROUP_SIZE> and returns the result.
-=item $ulong = $kernel->local_mem_size ($device)
-Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_LOCAL_MEM_SIZE> and returns the result.
-=item $int = $kernel->preferred_work_group_size_multiple ($device)
-Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_PREFERRED_WORK_GROUP_SIZE_MULTIPLE> and returns the result.
-=item $ulong = $kernel->private_mem_size ($device)
-Calls C<clGetKernelWorkGroupInfo> with C<CL_KERNEL_PRIVATE_MEM_SIZE> and returns the result.
-=for gengetinfo end kernel_work_group
-=item $kernel->set_TYPE ($index, $value)
-This is a family of methods to set the kernel argument with the number C<$index> to the give C<$value>.
-TYPE is one of C<char>, C<uchar>, C<short>, C<ushort>, C<int>, C<uint>,
-C<long>, C<ulong>, C<half>, C<float>, C<double>, C<memory>, C<buffer>,
-C<image2d>, C<image3d>, C<sampler> or C<event>.
-Chars and integers (including the half type) are specified as integers,
-float and double as floating point values, memory/buffer/image2d/image3d
-must be an object of that type or C<undef>, and sampler and event must be
-objects of that type.
-L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetKernelArg.html>
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetProfilingInfo.html>
+=for gengetinfo begin profiling
+=item $ulong = $event->profiling_command_queued
+Calls C<clGetEventProfilingInfo> with C<OpenCL::PROFILING_COMMAND_QUEUED> and returns the result.
+=item $ulong = $event->profiling_command_submit
+Calls C<clGetEventProfilingInfo> with C<OpenCL::PROFILING_COMMAND_SUBMIT> and returns the result.
+=item $ulong = $event->profiling_command_start
+Calls C<clGetEventProfilingInfo> with C<OpenCL::PROFILING_COMMAND_START> and returns the result.
+=item $ulong = $event->profiling_command_end
+Calls C<clGetEventProfilingInfo> with C<OpenCL::PROFILING_COMMAND_END> and returns the result.
+=for gengetinfo end profiling
 =back
-=head2 THE OpenCL::Event CLASS
+=head2 THE OpenCL::UserEvent CLASS
-This is the superclass for all event objects (including OpenCL::UserEvent
+This is a subclass of OpenCL::Event.
-objects).
 =over 4
-=item $ev->wait
+=item $ev->set_status ($execution_status)
-Waits for the event to complete.
+Sets the execution status of the user event. Can only be called once,
+either with OpenCL::COMPLETE or a negative number as status.
+execution_status: OpenCL::COMPLETE or a negative integer.
-L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clWaitForEvents.html>
+L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetUserEventStatus.html>
-=item $packed_value = $ev->info ($name)
-See C<< $platform->info >> for details.
-L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetEventInfo.html>
-=for gengetinfo begin event
-=item $queue = $event->command_queue
-Calls C<clGetEventInfo> with C<CL_EVENT_COMMAND_QUEUE> and returns the result.
-=item $command_type = $event->command_type
-Calls C<clGetEventInfo> with C<CL_EVENT_COMMAND_TYPE> and returns the result.
-=item $uint = $event->reference_count
-Calls C<clGetEventInfo> with C<CL_EVENT_REFERENCE_COUNT> and returns the result.
-=item $uint = $event->command_execution_status
-Calls C<clGetEventInfo> with C<CL_EVENT_COMMAND_EXECUTION_STATUS> and returns the result.
-=item $ctx = $event->context
-Calls C<clGetEventInfo> with C<CL_EVENT_CONTEXT> and returns the result.
-=for gengetinfo end event
-=item $packed_value = $ev->profiling_info ($name)
-See C<< $platform->info >> for details.
-The reason this method is not called C<info> is that there already is an
-C<< ->info >> method.
-L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetProfilingInfo.html>
-=for gengetinfo begin profiling
-=item $ulong = $event->profiling_command_queued
-Calls C<clGetEventProfilingInfo> with C<CL_PROFILING_COMMAND_QUEUED> and returns the result.
-=item $ulong = $event->profiling_command_submit
-Calls C<clGetEventProfilingInfo> with C<CL_PROFILING_COMMAND_SUBMIT> and returns the result.
-=item $ulong = $event->profiling_command_start
-Calls C<clGetEventProfilingInfo> with C<CL_PROFILING_COMMAND_START> and returns the result.
-=item $ulong = $event->profiling_command_end
-Calls C<clGetEventProfilingInfo> with C<CL_PROFILING_COMMAND_END> and returns the result.
-=for gengetinfo end profiling
 =back
-=head2 THE OpenCL::UserEvent CLASS
+=head2 THE OpenCL::Mapped CLASS
-This is a subclass of OpenCL::Event.
+This class represents objects mapped into host memory. They are
+represented by a blessed string scalar. The string data is the mapped
+memory area, that is, if you read or write it, then the mapped object is
+accessed directly.
+You must only ever use operations that modify the string in-place - for
+example, a C<substr> that doesn't change the length, or maybe a regex that
+doesn't change the length. Any other operation might cause the data to be
+copied.
+When the object is destroyed it will enqueue an implicit unmap operation
+on the queue that was used to create it.
+Keep in mind that you I<need> to unmap (or destroy) mapped objects before
+OpenCL sees the changes, even if some implementations don't need this
+sometimes.
+Example, replace the first two floats in the mapped buffer by 1 and 2.
+   my $mapped = $queue->map_buffer ($buf, ...
+   $mapped->event->wait; # make sure it's there
+   # now replace first 8 bytes by new data, which is exactly 8 bytes long
+   # we blindly assume device endianness to equal host endianness
+   # (and of course, we assume iee 754 single precision floats :)
+   substr $$mapped, 0, 8, pack "f*", 1, 2;
 =over 4
-=item $ev->set_status ($execution_status)
+=item $ev = $mapped->unmap ($wait_events...)
-L<http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clSetUserEventStatus.html>
+Unmaps the mapped memory object, using the queue originally used to create
+it, quite similarly to C<< $queue->unmap ($mapped, ...) >>.
+=item $bool = $mapped->mapped
+Returns whether the object is still mapped - true before an C<unmap> is
+enqueued, false afterwards.
+=item $ev = $mapped->event
+Return the event object associated with the mapped object. Initially, this
+will be the event object created when mapping the object, and after an
+unmap, this will be the event object that the unmap operation created.
+=item $mapped->wait
+Same as C<< $mapped->event->wait >> - makes sure no operations on this
+mapped object are outstanding.
+=item $bytes = $mapped->size
+Returns the size of the mapped area, in bytes. Same as C<length $$mapped>.
+=item $ptr = $mapped->ptr
+Returns the raw memory address of the mapped area.
+=item $mapped->set ($offset, $data)
+Replaces the data at the given C<$offset> in the memory area by the new
+C<$data>. This method is safer than direct manipulation of C<$mapped>
+because it does bounds-checking, but also slower.
+=item $data = $mapped->get ($offset, $length)
+Returns (without copying) a scalar representing the data at the given
+C<$offset> and C<$length> in the mapped memory area. This is the same as
+the following substr, except much slower;
+   $data = substr $$mapped, $offset, $length
+=cut
+sub OpenCL::Mapped::get {
+   substr ${$_[0]}, $_[1], $_[2]
+}
 =back
+=head2 THE OpenCL::MappedBuffer CLASS
+This is a subclass of OpenCL::Mapped, representing mapped buffers.
+=head2 THE OpenCL::MappedImage CLASS
+This is a subclass of OpenCL::Mapped, representing mapped images.
+=over 4
+=item $bytes = $mapped->row_pitch
+=item $bytes = $mapped->slice_pitch
+Return the row or slice pitch of the image that has been mapped.
+=back
 =cut
-package OpenCL;
-use common::sense;
-BEGIN {
-   our $VERSION = '0.91';
-   require XSLoader;
-   XSLoader::load (__PACKAGE__, $VERSION);
-   @OpenCL::Buffer::ISA =
-   @OpenCL::Image::ISA      = OpenCL::Memory::;
-   @OpenCL::BufferObj::ISA  = OpenCL::Buffer::;
-   @OpenCL::Image2D::ISA    =
-   @OpenCL::Image3D::ISA    = OpenCL::Image::;
-   @OpenCL::UserEvent::ISA  = OpenCL::Event::;
-}
 1;
 =head1 AUTHOR

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Comparing OpenCL/OpenCL.pm (file contents): Revision 1.29 by root, Thu Apr 5 07:13:44 2012 UTC vs. Revision 1.76 by root, Sat May 5 02:45:38 2012 UTC

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Comparing OpenCL/OpenCL.pm (file contents):
Revision 1.29 by root, Thu Apr 5 07:13:44 2012 UTC vs.
Revision 1.76 by root, Sat May 5 02:45:38 2012 UTC