func CLEnqueueReadBuffer(command_queue CL_command_queue,
buffer CL_mem,
blocking_read CL_bool,
offset CL_size_t,
cb CL_size_t,
ptr unsafe.Pointer,
num_events_in_wait_list CL_uint,
event_wait_list []CL_event,
event *CL_event) CL_int {
if (num_events_in_wait_list == 0 && event_wait_list != nil) ||
(num_events_in_wait_list != 0 && event_wait_list == nil) ||
int(num_events_in_wait_list) != len(event_wait_list) {
return CL_INVALID_EVENT_WAIT_LIST
}
var c_event C.cl_event
var c_errcode_ret C.cl_int
if num_events_in_wait_list != 0 {
var c_event_wait_list []C.cl_event
c_event_wait_list = make([]C.cl_event, num_events_in_wait_list)
for i := 0; i < int(num_events_in_wait_list); i++ {
c_event_wait_list[i] = event_wait_list[i].cl_event
}
c_errcode_ret = C.clEnqueueReadBuffer(command_queue.cl_command_queue,
buffer.cl_mem,
C.cl_bool(blocking_read),
C.size_t(offset),
C.size_t(cb),
ptr,
C.cl_uint(num_events_in_wait_list),
&c_event_wait_list[0],
&c_event)
} else {
c_errcode_ret = C.clEnqueueReadBuffer(command_queue.cl_command_queue,
buffer.cl_mem,
C.cl_bool(blocking_read),
C.size_t(offset),
C.size_t(cb),
ptr,
0,
nil,
&c_event)
}
if event != nil {
event.cl_event = c_event
}
return CL_int(c_errcode_ret)
}
func (cq *CommandQueue) EnqueueReadBuffer(buf *Buffer, offset uint32, size uint32) ([]byte, error) {
bytes := make([]byte, size)
if ret := C.clEnqueueReadBuffer(cq.id, buf.id, C.CL_TRUE, C.size_t(offset), C.size_t(size), unsafe.Pointer(&bytes[0]), 0, nil, nil); ret != C.CL_SUCCESS {
return nil, Cl_error(ret)
}
return bytes, nil
}
// see https://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clEnqueueReadBuffer.html
func EnqueueReadBuffer(cq CommandQueue, buffer Mem, blocking_read Bool, offset uint64, size uint64, ptr unsafe.Pointer, num_events_in_wait_list uint32, event_wait_list *Event, event *Event) ErrorCode {
return ErrorCode(C.clEnqueueReadBuffer(cq, buffer, C.cl_bool(blocking_read), C.size_t(offset), C.size_t(size), unsafe.Pointer(ptr), C.cl_uint(num_events_in_wait_list), (*C.cl_event)(unsafe.Pointer(event_wait_list)), (*C.cl_event)(unsafe.Pointer(event))))
}
// Enqueue commands to read from a buffer object to host memory.
func (q *CommandQueue) EnqueueReadBuffer(buffer *MemObject, blocking bool, offset, dataSize int, dataPtr unsafe.Pointer, eventWaitList []*Event) (*Event, error) {
var event C.cl_event
err := toError(C.clEnqueueReadBuffer(q.clQueue, buffer.clMem, clBool(blocking), C.size_t(offset), C.size_t(dataSize), dataPtr, C.cl_uint(len(eventWaitList)), eventListPtr(eventWaitList), &event))
return newEvent(event), err
}