func (this *context) CreateImage2D(flags cl.CL_mem_flags,
image_format *cl.CL_image_format,
image_width cl.CL_size_t,
image_height cl.CL_size_t,
image_row_pitch cl.CL_size_t,
host_ptr unsafe.Pointer) (Image, error) {
var errCode cl.CL_int
if memory_id := cl.CLCreateImage2D(this.context_id,
flags,
image_format,
image_width,
image_height,
image_row_pitch,
host_ptr,
&errCode); errCode != cl.CL_SUCCESS {
return nil, fmt.Errorf("CreateImage2D failure with errcode_ret %d: %s", errCode, cl.ERROR_CODES_STRINGS[-errCode])
} else {
return &image{memory{memory_id}}, nil
}
}
func main() {
/* OpenCL data structures */
var device []cl.CL_device_id
var context cl.CL_context
var queue cl.CL_command_queue
var program *cl.CL_program
var kernel cl.CL_kernel
var err cl.CL_int
var err1 error
var global_size [2]cl.CL_size_t
/* Image data */
var pixels []uint16
var png_format cl.CL_image_format
var input_image, output_image cl.CL_mem
var origin, region [3]cl.CL_size_t
var width, height cl.CL_size_t
/* Open input file and read image data */
pixels, width, height, err1 = utils.Read_image_data(INPUT_FILE)
if err1 != nil {
return
} else {
fmt.Printf("width=%d, height=%d", width, height)
}
/* Create a device and context */
device = utils.Create_device()
context = cl.CLCreateContext(nil, 1, device[:], nil, nil, &err)
if err < 0 {
println("Couldn't create a context")
return
}
/* Build the program and create a kernel */
program = utils.Build_program(context, device[:], PROGRAM_FILE, nil)
kernel = cl.CLCreateKernel(*program, KERNEL_FUNC, &err)
if err < 0 {
fmt.Printf("Couldn't create a kernel: %d", err)
return
}
/* Create image object */
png_format.Image_channel_order = cl.CL_LUMINANCE
png_format.Image_channel_data_type = cl.CL_UNORM_INT16
input_image = cl.CLCreateImage2D(context,
cl.CL_MEM_READ_ONLY|cl.CL_MEM_COPY_HOST_PTR,
&png_format, width, height, 0, unsafe.Pointer(&pixels[0]), &err)
output_image = cl.CLCreateImage2D(context,
cl.CL_MEM_WRITE_ONLY, &png_format, width, height, 0, nil, &err)
if err < 0 {
println("Couldn't create the image object")
return
}
/* Create kernel arguments */
err = cl.CLSetKernelArg(kernel, 0, cl.CL_size_t(unsafe.Sizeof(input_image)), unsafe.Pointer(&input_image))
err |= cl.CLSetKernelArg(kernel, 1, cl.CL_size_t(unsafe.Sizeof(output_image)), unsafe.Pointer(&output_image))
if err < 0 {
println("Couldn't set a kernel argument")
return
}
/* Create a command queue */
queue = cl.CLCreateCommandQueue(context, device[0], 0, &err)
if err < 0 {
println("Couldn't create a command queue")
return
}
/* Enqueue kernel */
global_size[0] = width
global_size[1] = height
err = cl.CLEnqueueNDRangeKernel(queue, kernel, 2, nil, global_size[:],
nil, 0, nil, nil)
if err < 0 {
println("Couldn't enqueue the kernel")
return
}
/* Read the image object */
origin[0] = 0
origin[1] = 0
origin[2] = 0
region[0] = width
region[1] = height
region[2] = 1
err = cl.CLEnqueueReadImage(queue, output_image, cl.CL_TRUE, origin,
region, 0, 0, unsafe.Pointer(&pixels[0]), 0, nil, nil)
if err < 0 {
println("Couldn't read from the image object")
return
}
/* Create output PNG file and write data */
utils.Write_image_data(OUTPUT_FILE, pixels, width, height)
/* Deallocate resources */
cl.CLReleaseMemObject(input_image)
cl.CLReleaseMemObject(output_image)
cl.CLReleaseKernel(kernel)
cl.CLReleaseCommandQueue(queue)
cl.CLReleaseProgram(*program)
cl.CLReleaseContext(context)
}