clCreateBuffer clEnqueueWriteBuffer clSetKernelArg clEnqueueReadBuffer

http://www.khronos.org/registry/cl/sdk/1.0/docs/man/xhtml/clCreateBuffer.html

cl_mem clCreateBuffer (cl_context context, cl_mem_flags flags, size_t size, void *host_ptr, cl_int *errcode_ret)

flags

CL_MEM_READ_WRITE

CL_MEM_WRITE_ONLY

CL_MEM_READ_ONLY

CL_MEM_USE_HOST_PTR

CL_MEM_ALLOC_HOST_PTR

CL_MEM_COPY_HOST_PTR

cl_mem clEnqueueWriteBuffer (cl_command_queue command_queue, cl_mem buffer, cl_bool blocking_write, size_t offset, size_t cb, const void *ptr, cl_uint num_events_in_wait_list, const cl_event *event_wait_list, cl_event *event)

cl_int clSetKernelArg (cl_kernel kernel, cl_uint arg_index, size_t arg_size, const void *arg_value)

cl_int clEnqueueReadBuffer (cl_command_queue command_queue, cl_mem buffer, cl_bool blocking_read, size_t offset, size_t cb, void *ptr, cl_uint num_events_in_wait_list, const cl_event *event_wait_list, cl_event *event)

NOTICE! cl_mem 자체가 포인터이다.

(typedef struct _cl_mem *            cl_mem;)

호스트 

cl_mem clmem_input = clCreateBuffer(context, CL_MEM_WRITE_ONLY, SIZE, 0, err);

clEnqueueWriteBuffer(commandq, clmem_input, CL_TRUE, 0, SIZE, INPUT_ptr, 0, 0);

clSetKernelArg(kernel, arg++, sizeof(cl_mem), clmem_input);

cl_mem clmem_result = clCreateBuffer(context, CL_MEM_READ_ONLY, SIZE, 0, err);

clSetKernelArg(kernel, arg++, sizeof(cl_mem),  clmem_result );

커널

__kernel Goo(global unsigned char* clmem1, local unsigned char* clmem2)

{

}

호스트

clEnqueueReadBuffer(commandq, clmem_result, CL_TRUE, 0, SIZE, OUTPUT_ptr, 0,0,0);

clReleaseMemObject(clmem_input);

clReleaseMemObject(clmem_result);