1/* 2 * Copyright (c) 2016, 2017 Arm Limited. 3 * 4 * SPDX-License-Identifier: MIT 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to 8 * deal in the Software without restriction, including without limitation the 9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in all 14 * copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 * SOFTWARE. 23 */ 24#include "helpers.h" 25 26/** This OpenCL kernel that computes the first-order derivative. 27 * 28 * @attention To enable computation of the X gradient -DGRAD_X must be passed at compile time, while computation of the Y gradient 29 * is performed when -DGRAD_Y is used. You can use both when computation of both gradients is required. 30 * 31 * @param[in] src_ptr Pointer to the source image. Supported data types: U8 32 * @param[in] src_stride_x Stride of the source image in X dimension (in bytes) 33 * @param[in] src_step_x src_stride_x * number of elements along X processed per workitem(in bytes) 34 * @param[in] src_stride_y Stride of the source image in Y dimension (in bytes) 35 * @param[in] src_step_y src_stride_y * number of elements along Y processed per workitem(in bytes) 36 * @param[in] src_offset_first_element_in_bytes The offset of the first element in the source image 37 * @param[out] dst_gx_ptr Pointer to the destination image. Supported data types: S16 38 * @param[in] dst_gx_stride_x Stride of the destination image in X dimension (in bytes) 39 * @param[in] dst_gx_step_x dst_gx_stride_x * number of elements along X processed per workitem(in bytes) 40 * @param[in] dst_gx_stride_y Stride of the destination image in Y dimension (in bytes) 41 * @param[in] dst_gx_step_y dst_gx_stride_y * number of elements along Y processed per workitem(in bytes) 42 * @param[in] dst_gx_offset_first_element_in_bytes The offset of the first element in the destination image 43 * @param[out] dst_gy_ptr Pointer to the destination image. Supported data types: S16 44 * @param[in] dst_gy_stride_x Stride of the destination image in X dimension (in bytes) 45 * @param[in] dst_gy_step_x dst_gy_stride_x * number of elements along X processed per workitem(in bytes) 46 * @param[in] dst_gy_stride_y Stride of the destination image in Y dimension (in bytes) 47 * @param[in] dst_gy_step_y dst_gy_stride_y * number of elements along Y processed per workitem(in bytes) 48 * @param[in] dst_gy_offset_first_element_in_bytes The offset of the first element in the destination image 49 */ 50__kernel void derivative( 51 IMAGE_DECLARATION(src) 52#ifdef GRAD_X 53 , 54 IMAGE_DECLARATION(dst_gx) 55#endif /* GRAD_X */ 56#ifdef GRAD_Y 57 , 58 IMAGE_DECLARATION(dst_gy) 59#endif /* GRAD_Y */ 60) 61{ 62 Image src = CONVERT_TO_IMAGE_STRUCT(src); 63#ifdef GRAD_X 64 Image dst_gx = CONVERT_TO_IMAGE_STRUCT(dst_gx); 65#endif /* GRAD_X */ 66#ifdef GRAD_Y 67 Image dst_gy = CONVERT_TO_IMAGE_STRUCT(dst_gy); 68#endif /* GRAD_Y */ 69 70#ifdef GRAD_X 71 short16 l_data = convert_short16(vload16(0, offset(&src, -1, 0))); 72 short16 r_data = convert_short16(vload16(0, offset(&src, 1, 0))); 73 vstore16(r_data - l_data, 0, ((__global short *)dst_gx.ptr)); 74#endif /* GRAD_X */ 75#ifdef GRAD_Y 76 short16 t_data = convert_short16(vload16(0, offset(&src, 0, -1))); 77 short16 b_data = convert_short16(vload16(0, offset(&src, 0, 1))); 78 vstore16(b_data - t_data, 0, ((__global short *)dst_gy.ptr)); 79#endif /* GRAD_Y */ 80} 81