| /* |
| * Copyright (c) 2016, 2017 ARM Limited. |
| * |
| * SPDX-License-Identifier: MIT |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to |
| * deal in the Software without restriction, including without limitation the |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in all |
| * copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| #include "helpers.h" |
| |
| /** This OpenCL kernel that computes the first-order derivative. |
| * |
| * @attention To enable computation of the X gradient -DGRAD_X must be passed at compile time, while computation of the Y gradient |
| * is performed when -DGRAD_Y is used. You can use both when computation of both gradients is required. |
| * |
| * @param[in] src_ptr Pointer to the source image. Supported data types: U8 |
| * @param[in] src_stride_x Stride of the source image in X dimension (in bytes) |
| * @param[in] src_step_x src_stride_x * number of elements along X processed per workitem(in bytes) |
| * @param[in] src_stride_y Stride of the source image in Y dimension (in bytes) |
| * @param[in] src_step_y src_stride_y * number of elements along Y processed per workitem(in bytes) |
| * @param[in] src_offset_first_element_in_bytes The offset of the first element in the source image |
| * @param[out] dst_gx_ptr Pointer to the destination image. Supported data types: S16 |
| * @param[in] dst_gx_stride_x Stride of the destination image in X dimension (in bytes) |
| * @param[in] dst_gx_step_x dst_gx_stride_x * number of elements along X processed per workitem(in bytes) |
| * @param[in] dst_gx_stride_y Stride of the destination image in Y dimension (in bytes) |
| * @param[in] dst_gx_step_y dst_gx_stride_y * number of elements along Y processed per workitem(in bytes) |
| * @param[in] dst_gx_offset_first_element_in_bytes The offset of the first element in the destination image |
| * @param[out] dst_gy_ptr Pointer to the destination image. Supported data types: S16 |
| * @param[in] dst_gy_stride_x Stride of the destination image in X dimension (in bytes) |
| * @param[in] dst_gy_step_x dst_gy_stride_x * number of elements along X processed per workitem(in bytes) |
| * @param[in] dst_gy_stride_y Stride of the destination image in Y dimension (in bytes) |
| * @param[in] dst_gy_step_y dst_gy_stride_y * number of elements along Y processed per workitem(in bytes) |
| * @param[in] dst_gy_offset_first_element_in_bytes The offset of the first element in the destination image |
| */ |
| __kernel void derivative( |
| IMAGE_DECLARATION(src) |
| #ifdef GRAD_X |
| , |
| IMAGE_DECLARATION(dst_gx) |
| #endif /* GRAD_X */ |
| #ifdef GRAD_Y |
| , |
| IMAGE_DECLARATION(dst_gy) |
| #endif /* GRAD_Y */ |
| ) |
| { |
| Image src = CONVERT_TO_IMAGE_STRUCT(src); |
| #ifdef GRAD_X |
| Image dst_gx = CONVERT_TO_IMAGE_STRUCT(dst_gx); |
| #endif /* GRAD_X */ |
| #ifdef GRAD_Y |
| Image dst_gy = CONVERT_TO_IMAGE_STRUCT(dst_gy); |
| #endif /* GRAD_Y */ |
| |
| #ifdef GRAD_X |
| short16 l_data = convert_short16(vload16(0, offset(&src, -1, 0))); |
| short16 r_data = convert_short16(vload16(0, offset(&src, 1, 0))); |
| vstore16(r_data - l_data, 0, ((__global short *)dst_gx.ptr)); |
| #endif /* GRAD_X */ |
| #ifdef GRAD_Y |
| short16 t_data = convert_short16(vload16(0, offset(&src, 0, -1))); |
| short16 b_data = convert_short16(vload16(0, offset(&src, 0, 1))); |
| vstore16(b_data - t_data, 0, ((__global short *)dst_gy.ptr)); |
| #endif /* GRAD_Y */ |
| } |
