NAME OpenCL - Open Computing Language Bindings SYNOPSIS use OpenCL; DESCRIPTION This is an early release which might be useful, but hasn't seen much testing. OpenCL FROM 10000 FEET HEIGHT Here is a high level overview of OpenCL: First you need to find one or more OpenCL::Platforms (kind of like vendors) - usually there is only one. Each platform gives you access to a number of OpenCL::Device objects, e.g. your graphics card. From a platform and some device(s), you create an OpenCL::Context, which is a very central object in OpenCL: Once you have a context you can create most other objects: OpenCL::Program objects, which store source code and, after building for a specific device ("compiling and linking"), also binary programs. For each kernel function in a program you can then create an OpenCL::Kernel object which represents basically a function call with argument values. OpenCL::Memory objects of various flavours: OpenCL::Buffer objects (flat memory areas, think arrays or structs) and OpenCL::Image objects (think 2d or 3d array) for bulk data and input and output for kernels. OpenCL::Sampler objects, which are kind of like texture filter modes in OpenGL. OpenCL::Queue objects - command queues, which allow you to submit memory reads, writes and copies, as well as kernel calls to your devices. They also offer a variety of methods to synchronise request execution, for example with barriers or OpenCL::Event objects. OpenCL::Event objects are used to signal when something is complete. HELPFUL RESOURCES The OpenCL spec used to develop this module (1.2 spec was available, but no implementation was available to me :). http://www.khronos.org/registry/cl/specs/opencl-1.1.pdf OpenCL manpages: http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/ If you are into UML class diagrams, the following diagram might help - if not, it will be mildly cobfusing: http://www.khronos.org/registry/cl/sdk/1.1/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 And here's NVIDIA's OpenCL Best Practises Guide: http://developer.download.nvidia.com/compute/cuda/3_2/toolkit/docs/OpenCL_Best_Practices_Guide.pdf BASIC WORKFLOW To get something done, you basically have to do this once (refer to the examples below for actual code, this is just a high-level description): Find some platform (e.g. the first one) and some device(s) (e.g. the first device of the platform), and create a context from those. Create program objects from your OpenCL source code, then build (compile) the programs for each device you want to run them on. Create kernel objects for all kernels you want to use (surprisingly, these are not device-specific). Then, to execute stuff, you repeat these steps, possibly resuing or sharing some buffers: Create some input and output buffers from your context. Set these as arguments to your kernel. Enqueue buffer writes to initialise your input buffers (when not initialised at creation time). Enqueue the kernel execution. Enqueue buffer reads for your output buffer to read results. EXAMPLES Enumerate all devices and get contexts for them. Best run this once to get a feel for the platforms and devices in your system. for my $platform (OpenCL::platforms) { printf "platform: %s\n", $platform->name; printf "extensions: %s\n", $platform->extensions; for my $device ($platform->devices) { printf "+ device: %s\n", $device->name; my $ctx = $platform->context (undef, [$device]); # do stuff } } Get a useful context and a command queue. This is a useful boilerplate for any OpenCL program that only wants to use one device, my ($platform) = OpenCL::platforms; # find first platform my ($dev) = $platform->devices; # find first device of platform my $ctx = $platform->context (undef, [$dev]); # create context out of those my $queue = $ctx->queue ($dev); # create a command queue for the device Print all supported image formats of a context. Best run this once for your context, to see whats available and how to gather information. for my $type (OpenCL::MEM_OBJECT_IMAGE2D, OpenCL::MEM_OBJECT_IMAGE3D) { print "supported image formats for ", OpenCL::enum2str $type, "\n"; for my $f ($ctx->supported_image_formats (0, $type)) { printf " %-10s %-20s\n", OpenCL::enum2str $f->[0], OpenCL::enum2str $f->[1]; } } 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 $data); print "$data\n"; my $ev = $queue->enqueue_read_buffer ($buf, 0, 1, 3, my $data); $ev->wait; print "$data\n"; # prints "elm" Create and build a program, then create a kernel out of one of its functions. my $src = ' kernel void 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); # 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"); Create some input and output float buffers, then call the 'squareit' kernel on them. my $input = $ctx->buffer_sv (OpenCL::MEM_COPY_HOST_PTR, pack "f*", 1, 2, 3, 4.5); my $output = $ctx->buffer (0, OpenCL::SIZEOF_FLOAT * 5); # 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); # enqueue a synchronous read $queue->enqueue_read_buffer ($output, 1, 0, OpenCL::SIZEOF_FLOAT * 4, my $data); # print the results: printf "%s\n", join ", ", unpack "f*", $data; 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); # enqueue a barrier to ensure in-order execution $queue->enqueue_barrier; # enqueue an async read $queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data); # wait for all requests to finish $queue->finish; 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); # enqueue an async read $ev = $queue->enqueue_read_buffer ($output, 0, 0, OpenCL::SIZEOF_FLOAT * 4, my $data, $ev); # wait for the last event to complete $ev->wait; Use the OpenGL module to share a texture between OpenCL and OpenGL and draw some julia set tunnel effect. This is quite a long example to get you going. use OpenGL ":all"; use OpenCL; # open a window and create a gl texture OpenGL::glpOpenWindow width => 256, height => 256; my $texid = glGenTextures_p 1; glBindTexture GL_TEXTURE_2D, $texid; glTexImage2D_c GL_TEXTURE_2D, 0, GL_RGBA8, 256, 256, 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 $src = <program_with_source ($src); eval { $prog->build ($dev); 1 } or die $prog->build_log ($dev); my $kernel = $prog->kernel ("juliatunnel"); # program compiled, kernel ready, now draw and loop for (my $time; ; ++$time) { # acquire objects from opengl $queue->enqueue_acquire_gl_objects ([$tex]); # configure and run our kernel $kernel->set_image2d (0, $tex); $kernel->set_float (1, $time); $queue->enqueue_nd_range_kernel ($kernel, undef, [256, 256], undef); # release objects to opengl again $queue->enqueue_release_gl_objects ([$tex]); # wait $queue->flush; # now draw the texture, the defaults should be all right glTexParameterf GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST; glEnable GL_TEXTURE_2D; glBegin GL_QUADS; glTexCoord2f 0, 1; glVertex3i -1, -1, -1; glTexCoord2f 0, 0; glVertex3i 1, -1, -1; glTexCoord2f 1, 0; glVertex3i 1, 1, -1; glTexCoord2f 1, 1; glVertex3i -1, 1, -1; glEnd; glXSwapBuffers; select undef, undef, undef, 1/60; } DOCUMENTATION BASIC CONVENTIONS This is not a one-to-one C-style translation of OpenCL to Perl - instead I attempted to make the interface as type-safe as possible by introducing object syntax where it makes sense. There are a number of important differences between the OpenCL C API and this module: * Object lifetime managament is automatic - there is no need to free objects explicitly ("clReleaseXXX"), the release function is called automatically once all Perl references to it go away. * OpenCL uses CamelCase for function names (e.g. "clGetPlatformIDs", "clGetPlatformInfo"), while this module uses underscores as word separator and often leaves out prefixes ("OpenCL::platforms", "$platform->info"). * OpenCL often specifies fixed vector function arguments as short arrays ("size_t origin[3]"), while this module explicitly expects the components as separate arguments ("$orig_x, $orig_y, $orig_z") in function calls. * Structures are often specified by flattening out their components as with short vectors, and returned as arrayrefs. * When enqueuing commands, the wait list is specified by adding extra arguments to the function - anywhere a "$wait_events..." argument is documented this can be any number of event objects. * 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. * This module expects all functions to return "CL_SUCCESS". If any other status is returned the function will throw an exception, so you don't normally have to to any error checking. PERL AND OPENCL TYPES This handy(?) table lists OpenCL types and their perl, PDL and pack/unpack format equivalents: OpenCL perl PDL pack/unpack char IV - c uchar IV byte C short IV short s ushort IV ushort S int IV long? l uint IV - L long IV longlong q ulong IV - Q float NV float f half IV ushort S double NV double d 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 "OpenCL::GLX_DISPLAY_KHR" and "OpenCL::GL_CONTEXT_KHR" specially: If either or both of these are "undef", then the OpenCL module tries to dynamically resolve "glXGetCurrentDisplay" and "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 "dlsym" must be available and capable of finding the function via "RTLD_DEFAULT". THE OpenCL PACKAGE $int = OpenCL::errno The last error returned by a function - it's only valid after an error occured and before calling another OpenCL function. $str = OpenCL::err2str $errval Comverts an error value into a human readable string. $str = OpenCL::enum2str $enum Converts most enum values (of parameter names, image format constants, object types, addressing and filter modes, command types etc.) into a 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. @platforms = OpenCL::platforms Returns all available OpenCL::Platform objects. $ctx = OpenCL::context_from_type $properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $notify = undef Tries to create a context from a default device and platform - never worked for me. OpenCL::wait_for_events $wait_events... Waits for all events to complete. THE OpenCL::Platform CLASS @devices = $platform->devices ($type = OpenCL::DEVICE_TYPE_ALL) Returns a list of matching OpenCL::Device objects. $ctx = $platform->context_from_type ($properties, $type = OpenCL::DEVICE_TYPE_DEFAULT, $notify = undef) Tries to create a context. Never worked for me, and you need devices explicitly anyway. $ctx = $platform->context ($properties = undef, @$devices, $notify = undef) Create a new OpenCL::Context object using the given device object(s)- a CL_CONTEXT_PLATFORM property is supplied automatically. $packed_value = $platform->info ($name) Calls "clGetPlatformInfo" and returns the packed, raw value - for strings, this will be the string (possibly including terminating \0), for other values you probably need to use the correct "unpack". It's best to avoid this method and use one of the following convenience wrappers. $string = $platform->profile Calls "clGetPlatformInfo" with "CL_PLATFORM_PROFILE" and returns the result. $string = $platform->version Calls "clGetPlatformInfo" with "CL_PLATFORM_VERSION" and returns the result. $string = $platform->name Calls "clGetPlatformInfo" with "CL_PLATFORM_NAME" and returns the result. $string = $platform->vendor Calls "clGetPlatformInfo" with "CL_PLATFORM_VENDOR" and returns the result. $string = $platform->extensions Calls "clGetPlatformInfo" with "CL_PLATFORM_EXTENSIONS" and returns the result. THE OpenCL::Device CLASS $packed_value = $device->info ($name) See "$platform->info" for details. $device_type = $device->type Calls "clGetDeviceInfo" with "CL_DEVICE_TYPE" and returns the result. $uint = $device->vendor_id Calls "clGetDeviceInfo" with "CL_DEVICE_VENDOR_ID" and returns the result. $uint = $device->max_compute_units Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_COMPUTE_UNITS" and returns the result. $uint = $device->max_work_item_dimensions Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_WORK_ITEM_DIMENSIONS" and returns the result. $int = $device->max_work_group_size Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_WORK_GROUP_SIZE" and returns the result. @ints = $device->max_work_item_sizes Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_WORK_ITEM_SIZES" and returns the result. $uint = $device->preferred_vector_width_char Calls "clGetDeviceInfo" with "CL_DEVICE_PREFERRED_VECTOR_WIDTH_CHAR" and returns the result. $uint = $device->preferred_vector_width_short Calls "clGetDeviceInfo" with "CL_DEVICE_PREFERRED_VECTOR_WIDTH_SHORT" and returns the result. $uint = $device->preferred_vector_width_int Calls "clGetDeviceInfo" with "CL_DEVICE_PREFERRED_VECTOR_WIDTH_INT" and returns the result. $uint = $device->preferred_vector_width_long Calls "clGetDeviceInfo" with "CL_DEVICE_PREFERRED_VECTOR_WIDTH_LONG" and returns the result. $uint = $device->preferred_vector_width_float Calls "clGetDeviceInfo" with "CL_DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT" and returns the result. $uint = $device->preferred_vector_width_double Calls "clGetDeviceInfo" with "CL_DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE" and returns the result. $uint = $device->max_clock_frequency Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_CLOCK_FREQUENCY" and returns the result. $bitfield = $device->address_bits Calls "clGetDeviceInfo" with "CL_DEVICE_ADDRESS_BITS" and returns the result. $uint = $device->max_read_image_args Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_READ_IMAGE_ARGS" and returns the result. $uint = $device->max_write_image_args Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_WRITE_IMAGE_ARGS" and returns the result. $ulong = $device->max_mem_alloc_size Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_MEM_ALLOC_SIZE" and returns the result. $int = $device->image2d_max_width Calls "clGetDeviceInfo" with "CL_DEVICE_IMAGE2D_MAX_WIDTH" and returns the result. $int = $device->image2d_max_height Calls "clGetDeviceInfo" with "CL_DEVICE_IMAGE2D_MAX_HEIGHT" and returns the result. $int = $device->image3d_max_width Calls "clGetDeviceInfo" with "CL_DEVICE_IMAGE3D_MAX_WIDTH" and returns the result. $int = $device->image3d_max_height Calls "clGetDeviceInfo" with "CL_DEVICE_IMAGE3D_MAX_HEIGHT" and returns the result. $int = $device->image3d_max_depth Calls "clGetDeviceInfo" with "CL_DEVICE_IMAGE3D_MAX_DEPTH" and returns the result. $uint = $device->image_support Calls "clGetDeviceInfo" with "CL_DEVICE_IMAGE_SUPPORT" and returns the result. $int = $device->max_parameter_size Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_PARAMETER_SIZE" and returns the result. $uint = $device->max_samplers Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_SAMPLERS" and returns the result. $uint = $device->mem_base_addr_align Calls "clGetDeviceInfo" with "CL_DEVICE_MEM_BASE_ADDR_ALIGN" and returns the result. $uint = $device->min_data_type_align_size Calls "clGetDeviceInfo" with "CL_DEVICE_MIN_DATA_TYPE_ALIGN_SIZE" and returns the result. $device_fp_config = $device->single_fp_config Calls "clGetDeviceInfo" with "CL_DEVICE_SINGLE_FP_CONFIG" and returns the result. $device_mem_cache_type = $device->global_mem_cache_type Calls "clGetDeviceInfo" with "CL_DEVICE_GLOBAL_MEM_CACHE_TYPE" and returns the result. $uint = $device->global_mem_cacheline_size Calls "clGetDeviceInfo" with "CL_DEVICE_GLOBAL_MEM_CACHELINE_SIZE" and returns the result. $ulong = $device->global_mem_cache_size Calls "clGetDeviceInfo" with "CL_DEVICE_GLOBAL_MEM_CACHE_SIZE" and returns the result. $ulong = $device->global_mem_size Calls "clGetDeviceInfo" with "CL_DEVICE_GLOBAL_MEM_SIZE" and returns the result. $ulong = $device->max_constant_buffer_size Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE" and returns the result. $uint = $device->max_constant_args Calls "clGetDeviceInfo" with "CL_DEVICE_MAX_CONSTANT_ARGS" and returns the result. $device_local_mem_type = $device->local_mem_type Calls "clGetDeviceInfo" with "CL_DEVICE_LOCAL_MEM_TYPE" and returns the result. $ulong = $device->local_mem_size Calls "clGetDeviceInfo" with "CL_DEVICE_LOCAL_MEM_SIZE" and returns the result. $boolean = $device->error_correction_support Calls "clGetDeviceInfo" with "CL_DEVICE_ERROR_CORRECTION_SUPPORT" and returns the result. $int = $device->profiling_timer_resolution Calls "clGetDeviceInfo" with "CL_DEVICE_PROFILING_TIMER_RESOLUTION" and returns the result. $boolean = $device->endian_little Calls "clGetDeviceInfo" with "CL_DEVICE_ENDIAN_LITTLE" and returns the result. $boolean = $device->available Calls "clGetDeviceInfo" with "CL_DEVICE_AVAILABLE" and returns the result. $boolean = $device->compiler_available Calls "clGetDeviceInfo" with "CL_DEVICE_COMPILER_AVAILABLE" and returns the result. $device_exec_capabilities = $device->execution_capabilities Calls "clGetDeviceInfo" with "CL_DEVICE_EXECUTION_CAPABILITIES" and returns the result. $command_queue_properties = $device->properties Calls "clGetDeviceInfo" with "CL_DEVICE_QUEUE_PROPERTIES" and returns the result. $ = $device->platform Calls "clGetDeviceInfo" with "CL_DEVICE_PLATFORM" and returns the result. $string = $device->name Calls "clGetDeviceInfo" with "CL_DEVICE_NAME" and returns the result. $string = $device->vendor Calls "clGetDeviceInfo" with "CL_DEVICE_VENDOR" and returns the result. $string = $device->driver_version Calls "clGetDeviceInfo" with "CL_DRIVER_VERSION" and returns the result. $string = $device->profile Calls "clGetDeviceInfo" with "CL_DEVICE_PROFILE" and returns the result. $string = $device->version Calls "clGetDeviceInfo" with "CL_DEVICE_VERSION" and returns the result. $string = $device->extensions Calls "clGetDeviceInfo" with "CL_DEVICE_EXTENSIONS" and returns the result. $uint = $device->preferred_vector_width_half Calls "clGetDeviceInfo" with "CL_DEVICE_PREFERRED_VECTOR_WIDTH_HALF" and returns the result. $uint = $device->native_vector_width_char Calls "clGetDeviceInfo" with "CL_DEVICE_NATIVE_VECTOR_WIDTH_CHAR" and returns the result. $uint = $device->native_vector_width_short Calls "clGetDeviceInfo" with "CL_DEVICE_NATIVE_VECTOR_WIDTH_SHORT" and returns the result. $uint = $device->native_vector_width_int Calls "clGetDeviceInfo" with "CL_DEVICE_NATIVE_VECTOR_WIDTH_INT" and returns the result. $uint = $device->native_vector_width_long Calls "clGetDeviceInfo" with "CL_DEVICE_NATIVE_VECTOR_WIDTH_LONG" and returns the result. $uint = $device->native_vector_width_float Calls "clGetDeviceInfo" with "CL_DEVICE_NATIVE_VECTOR_WIDTH_FLOAT" and returns the result. $uint = $device->native_vector_width_double Calls "clGetDeviceInfo" with "CL_DEVICE_NATIVE_VECTOR_WIDTH_DOUBLE" and returns the result. $uint = $device->native_vector_width_half Calls "clGetDeviceInfo" with "CL_DEVICE_NATIVE_VECTOR_WIDTH_HALF" and returns the result. $device_fp_config = $device->double_fp_config Calls "clGetDeviceInfo" with "CL_DEVICE_DOUBLE_FP_CONFIG" and returns the result. $device_fp_config = $device->half_fp_config Calls "clGetDeviceInfo" with "CL_DEVICE_HALF_FP_CONFIG" and returns the result. $boolean = $device->host_unified_memory Calls "clGetDeviceInfo" with "CL_DEVICE_HOST_UNIFIED_MEMORY" and returns the result. $device = $device->parent_device_ext Calls "clGetDeviceInfo" with "CL_DEVICE_PARENT_DEVICE_EXT" and returns the result. @device_partition_property_exts = $device->partition_types_ext Calls "clGetDeviceInfo" with "CL_DEVICE_PARTITION_TYPES_EXT" and returns the result. @device_partition_property_exts = $device->affinity_domains_ext Calls "clGetDeviceInfo" with "CL_DEVICE_AFFINITY_DOMAINS_EXT" and returns the result. $uint = $device->reference_count_ext Calls "clGetDeviceInfo" with "CL_DEVICE_REFERENCE_COUNT_EXT " and returns the result. @device_partition_property_exts = $device->partition_style_ext Calls "clGetDeviceInfo" with "CL_DEVICE_PARTITION_STYLE_EXT" and returns the result. THE OpenCL::Context CLASS $queue = $ctx->queue ($device, $properties) Create a new OpenCL::Queue object from the context and the given device. $ev = $ctx->user_event Creates a new OpenCL::UserEvent object. $buf = $ctx->buffer ($flags, $len) Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object with the given flags and octet-size. $buf = $ctx->buffer_sv ($flags, $data) Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object and initialise it with the given data values. $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. $img = $ctx->image3d ($flags, $channel_order, $channel_type, $width, $height, $depth, $row_pitch = 0, $slice_pitch = 0, $data = undef) Creates a new OpenCL::Image3D object and optionally initialises it with the given data values. $buffer = $ctx->gl_buffer ($flags, $bufobj) Creates a new OpenCL::Buffer (actually OpenCL::BufferObj) object that refers to the given OpenGL buffer object. http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clCreateFr omGLBuffer.html $ctx->gl_texture2d ($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/clCreateFr omGLTexture2D.html $ctx->gl_texture3d ($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/clCreateFr omGLTexture3D.html $ctx->gl_renderbuffer ($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/clCreateFr omGLRenderbuffer.html @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. $sampler = $ctx->sampler ($normalized_coords, $addressing_mode, $filter_mode) Creates a new OpenCL::Sampler object. $program = $ctx->program_with_source ($string) Creates a new OpenCL::Program object from the given source code. $packed_value = $ctx->info ($name) See "$platform->info" for details. $uint = $context->reference_count Calls "clGetContextInfo" with "CL_CONTEXT_REFERENCE_COUNT" and returns the result. @devices = $context->devices Calls "clGetContextInfo" with "CL_CONTEXT_DEVICES" and returns the result. @property_ints = $context->properties Calls "clGetContextInfo" with "CL_CONTEXT_PROPERTIES" and returns the result. $uint = $context->num_devices Calls "clGetContextInfo" with "CL_CONTEXT_NUM_DEVICES" and returns the result. THE OpenCL::Queue CLASS An OpenCL::Queue represents an execution queue for OpenCL. You execute requests by calling their respective "enqueue_xxx" method and waitinf for it to complete in some way. All the enqueue methods return an event object that can be used to wait for completion, unless 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. 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. $ev = $queue->enqueue_read_buffer ($buffer, $blocking, $offset, $len, $data, $wait_events...) Reads data from buffer into the given string. $ev = $queue->enqueue_write_buffer ($buffer, $blocking, $offset, $data, $wait_events...) Writes data to buffer from the given string. $ev = $queue->enqueue_copy_buffer ($src, $dst, $src_offset, $dst_offset, $len, $wait_events...) $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...) http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueR eadBufferRect.html $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...) http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueW riteBufferRect.html $ev = $queue->enqueue_read_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...) $ev = $queue->enqueue_copy_buffer_to_image ($src_buffer, $dst_image, $src_offset, $dst_x, $dst_y, $dst_z, $width, $height, $depth, $wait_events...) $ev = $queue->enqueue_write_image ($src, $blocking, $x, $y, $z, $width, $height, $depth, $row_pitch, $slice_pitch, $data, $wait_events...) $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...) $ev = $queue->enqueue_copy_image_to_buffer ($src_image, $dst_image, $src_x, $src_y, $src_z, $width, $height, $depth, $dst_offset, $wait_events...) $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...) Yeah. . $ev = $queue->enqueue_task ($kernel, $wait_events...) $ev = $queue->enqueue_nd_range_kernel ($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 integers specifying the work sizes (element counts). @$global_work_offset must be either "undef" (in which case all offsets are 0), or a reference to an array of work offsets, with the same number of elements as @$global_work_size. @$local_work_size must be either "undef" (in which case the implementation is supposed to choose good local work sizes), or a reference to an array of local work sizes, with the same number of elements as @$global_work_size. $ev = $queue->enqueue_marker ($wait_events...) $ev = $queue->enqueue_acquire_gl_objects ([object, ...], $wait_events...) Enqueues a list (an array-ref of OpenCL::Memory objects) to be acquired for subsequent OpenCL usage. $ev = $queue->enqueue_release_gl_objects ([object, ...], $wait_events...) Enqueues a list (an array-ref of OpenCL::Memory objects) to be released for subsequent OpenGL usage. $ev = $queue->enqueue_wait_for_events ($wait_events...) $queue->enqueue_barrier $queue->flush $queue->finish $packed_value = $queue->info ($name) See "$platform->info" for details. $ctx = $command_queue->context Calls "clGetCommandQueueInfo" with "CL_QUEUE_CONTEXT" and returns the result. $device = $command_queue->device Calls "clGetCommandQueueInfo" with "CL_QUEUE_DEVICE" and returns the result. $uint = $command_queue->reference_count Calls "clGetCommandQueueInfo" with "CL_QUEUE_REFERENCE_COUNT" and returns the result. $command_queue_properties = $command_queue->properties Calls "clGetCommandQueueInfo" with "CL_QUEUE_PROPERTIES" and returns the result. THE OpenCL::Memory CLASS This the superclass of all memory objects - OpenCL::Buffer, OpenCL::Image, OpenCL::Image2D and OpenCL::Image3D. $packed_value = $memory->info ($name) See "$platform->info" for details. $mem_object_type = $mem->type Calls "clGetMemObjectInfo" with "CL_MEM_TYPE" and returns the result. $mem_flags = $mem->flags Calls "clGetMemObjectInfo" with "CL_MEM_FLAGS" and returns the result. $int = $mem->size Calls "clGetMemObjectInfo" with "CL_MEM_SIZE" and returns the result. $ptr_value = $mem->host_ptr Calls "clGetMemObjectInfo" with "CL_MEM_HOST_PTR" and returns the result. $uint = $mem->map_count Calls "clGetMemObjectInfo" with "CL_MEM_MAP_COUNT" and returns the result. $uint = $mem->reference_count Calls "clGetMemObjectInfo" with "CL_MEM_REFERENCE_COUNT" and returns the result. $ctx = $mem->context Calls "clGetMemObjectInfo" with "CL_MEM_CONTEXT" and returns the result. $mem = $mem->associated_memobject Calls "clGetMemObjectInfo" with "CL_MEM_ASSOCIATED_MEMOBJECT" and returns the result. $int = $mem->offset Calls "clGetMemObjectInfo" with "CL_MEM_OFFSET" and returns the result. ($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. THE OpenCL::Buffer CLASS This is a subclass of OpenCL::Memory, and the superclass of OpenCL::BufferObj. Its purpose is simply to distinguish between buffers and sub-buffers. THE OpenCL::BufferObj CLASS This is a subclass of OpenCL::Buffer and thus OpenCL::Memory. It exists because one cna create sub buffers of OpenLC::BufferObj objects, but not sub buffers from these sub buffers. $subbuf = $buf_obj->sub_buffer_region ($flags, $origin, $size) Creates an OpenCL::Buffer objects from this buffer and returns it. The "buffer_create_type" is assumed to be "CL_BUFFER_CREATE_TYPE_REGION". THE OpenCL::Image CLASS This is the superclass of all image objects - OpenCL::Image2D and OpenCL::Image3D. $packed_value = $ev->image_info ($name) See "$platform->info" for details. The reason this method is not called "info" is that there already is an "->info" method inherited from "OpenCL::Memory". $int = $image->element_size Calls "clGetImageInfo" with "CL_IMAGE_ELEMENT_SIZE" and returns the result. $int = $image->row_pitch Calls "clGetImageInfo" with "CL_IMAGE_ROW_PITCH" and returns the result. $int = $image->slice_pitch Calls "clGetImageInfo" with "CL_IMAGE_SLICE_PITCH" and returns the result. $int = $image->width Calls "clGetImageInfo" with "CL_IMAGE_WIDTH" and returns the result. $int = $image->height Calls "clGetImageInfo" with "CL_IMAGE_HEIGHT" and returns the result. $int = $image->depth Calls "clGetImageInfo" with "CL_IMAGE_DEPTH" and returns the result. $GLenum = $gl_texture->target Calls "clGetGLTextureInfo" with "CL_GL_TEXTURE_TARGET" and returns the result. $GLint = $gl_texture->gl_mipmap_level Calls "clGetGLTextureInfo" with "CL_GL_MIPMAP_LEVEL" and returns the result. THE OpenCL::Sampler CLASS $packed_value = $sampler->info ($name) See "$platform->info" for details. $uint = $sampler->reference_count Calls "clGetSamplerInfo" with "CL_SAMPLER_REFERENCE_COUNT" and returns the result. $ctx = $sampler->context Calls "clGetSamplerInfo" with "CL_SAMPLER_CONTEXT" and returns the result. $addressing_mode = $sampler->normalized_coords Calls "clGetSamplerInfo" with "CL_SAMPLER_NORMALIZED_COORDS" and returns the result. $filter_mode = $sampler->addressing_mode Calls "clGetSamplerInfo" with "CL_SAMPLER_ADDRESSING_MODE" and returns the result. $boolean = $sampler->filter_mode Calls "clGetSamplerInfo" with "CL_SAMPLER_FILTER_MODE" and returns the result. THE OpenCL::Program CLASS $program->build ($device, $options = "") Tries to build the program with the givne options. $packed_value = $program->build_info ($device, $name) Similar to "$platform->info", but returns build info for a previous build attempt for the given device. $kernel = $program->kernel ($function_name) Creates an OpenCL::Kernel object out of the named "__kernel" function in the program. $build_status = $program->build_status ($device) Calls "clGetProgramBuildInfo" with "CL_PROGRAM_BUILD_STATUS" and returns the result. $string = $program->build_options ($device) Calls "clGetProgramBuildInfo" with "CL_PROGRAM_BUILD_OPTIONS" and returns the result. $string = $program->build_log ($device) Calls "clGetProgramBuildInfo" with "CL_PROGRAM_BUILD_LOG" and returns the result. $packed_value = $program->info ($name) See "$platform->info" for details. $uint = $program->reference_count Calls "clGetProgramInfo" with "CL_PROGRAM_REFERENCE_COUNT" and returns the result. $ctx = $program->context Calls "clGetProgramInfo" with "CL_PROGRAM_CONTEXT" and returns the result. $uint = $program->num_devices Calls "clGetProgramInfo" with "CL_PROGRAM_NUM_DEVICES" and returns the result. @devices = $program->devices Calls "clGetProgramInfo" with "CL_PROGRAM_DEVICES" and returns the result. $string = $program->source Calls "clGetProgramInfo" with "CL_PROGRAM_SOURCE" and returns the result. @ints = $program->binary_sizes Calls "clGetProgramInfo" with "CL_PROGRAM_BINARY_SIZES" and returns the result. @blobs = $program->binaries Returns a string for the compiled binary for every device associated with the program, empty strings indicate missing programs, and an empty result means no program binaries are available. These "binaries" are often, in fact, informative low-level assembly sources. THE OpenCL::Kernel CLASS $packed_value = $kernel->info ($name) See "$platform->info" for details. $string = $kernel->function_name Calls "clGetKernelInfo" with "CL_KERNEL_FUNCTION_NAME" and returns the result. $uint = $kernel->num_args Calls "clGetKernelInfo" with "CL_KERNEL_NUM_ARGS" and returns the result. $uint = $kernel->reference_count Calls "clGetKernelInfo" with "CL_KERNEL_REFERENCE_COUNT" and returns the result. $ctx = $kernel->context Calls "clGetKernelInfo" with "CL_KERNEL_CONTEXT" and returns the result. $program = $kernel->program Calls "clGetKernelInfo" with "CL_KERNEL_PROGRAM" and returns the result. $packed_value = $kernel->work_group_info ($device, $name) See "$platform->info" for details. The reason this method is not called "info" is that there already is an "->info" method. $int = $kernel->work_group_size ($device) Calls "clGetKernelWorkGroupInfo" with "CL_KERNEL_WORK_GROUP_SIZE" and returns the result. @ints = $kernel->compile_work_group_size ($device) Calls "clGetKernelWorkGroupInfo" with "CL_KERNEL_COMPILE_WORK_GROUP_SIZE" and returns the result. $ulong = $kernel->local_mem_size ($device) Calls "clGetKernelWorkGroupInfo" with "CL_KERNEL_LOCAL_MEM_SIZE" and returns the result. $int = $kernel->preferred_work_group_size_multiple ($device) Calls "clGetKernelWorkGroupInfo" with "CL_KERNEL_PREFERRED_WORK_GROUP_SIZE_MULTIPLE" and returns the result. $ulong = $kernel->private_mem_size ($device) Calls "clGetKernelWorkGroupInfo" with "CL_KERNEL_PRIVATE_MEM_SIZE" and returns the result. $kernel->set_TYPE ($index, $value) This is a family of methods to set the kernel argument with the number $index to the give $value. TYPE is one of "char", "uchar", "short", "ushort", "int", "uint", "long", "ulong", "half", "float", "double", "memory", "buffer", "image2d", "image3d", "sampler" or "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 "undef", and sampler and event must be objects of that type. THE OpenCL::Event CLASS This is the superclass for all event objects (including OpenCL::UserEvent objects). $ev->wait Waits for the event to complete. $packed_value = $ev->info ($name) See "$platform->info" for details. $queue = $event->command_queue Calls "clGetEventInfo" with "CL_EVENT_COMMAND_QUEUE" and returns the result. $command_type = $event->command_type Calls "clGetEventInfo" with "CL_EVENT_COMMAND_TYPE" and returns the result. $uint = $event->reference_count Calls "clGetEventInfo" with "CL_EVENT_REFERENCE_COUNT" and returns the result. $uint = $event->command_execution_status Calls "clGetEventInfo" with "CL_EVENT_COMMAND_EXECUTION_STATUS" and returns the result. $ctx = $event->context Calls "clGetEventInfo" with "CL_EVENT_CONTEXT" and returns the result. $packed_value = $ev->profiling_info ($name) See "$platform->info" for details. The reason this method is not called "info" is that there already is an "->info" method. $ulong = $event->profiling_command_queued Calls "clGetEventProfilingInfo" with "CL_PROFILING_COMMAND_QUEUED" and returns the result. $ulong = $event->profiling_command_submit Calls "clGetEventProfilingInfo" with "CL_PROFILING_COMMAND_SUBMIT" and returns the result. $ulong = $event->profiling_command_start Calls "clGetEventProfilingInfo" with "CL_PROFILING_COMMAND_START" and returns the result. $ulong = $event->profiling_command_end Calls "clGetEventProfilingInfo" with "CL_PROFILING_COMMAND_END" and returns the result. THE OpenCL::UserEvent CLASS This is a subclass of OpenCL::Event. $ev->set_status ($execution_status) AUTHOR Marc Lehmann http://home.schmorp.de/