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Diffstat (limited to 'src/core/CL/cl_kernels/derivative.cl')
-rw-r--r-- | src/core/CL/cl_kernels/derivative.cl | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/core/CL/cl_kernels/derivative.cl b/src/core/CL/cl_kernels/derivative.cl new file mode 100644 index 0000000000..0e810d2e7c --- /dev/null +++ b/src/core/CL/cl_kernels/derivative.cl @@ -0,0 +1,80 @@ +/* + * 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 +#ifdef GRAD_Y + , + IMAGE_DECLARATION(dst_gy) +#endif +) +{ + Image src = CONVERT_TO_IMAGE_STRUCT(src); +#ifdef GRAD_X + Image dst_gx = CONVERT_TO_IMAGE_STRUCT(dst_gx); +#endif +#ifdef GRAD_Y + Image dst_gy = CONVERT_TO_IMAGE_STRUCT(dst_gy); +#endif + +#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 +#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 +} |