| /* |
| * 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" |
| |
| /** Calculates L1 normalization between two inputs. |
| * |
| * @param[in] a First input. Supported data types: S16, S32 |
| * @param[in] b Second input. Supported data types: S16, S32 |
| * |
| * @return L1 normalization magnitude result. Supported data types: S16, S32 |
| */ |
| inline VEC_DATA_TYPE(DATA_TYPE, 16) magnitude_l1(VEC_DATA_TYPE(DATA_TYPE, 16) a, VEC_DATA_TYPE(DATA_TYPE, 16) b) |
| { |
| return CONVERT_SAT(add_sat(abs(a), abs(b)), VEC_DATA_TYPE(DATA_TYPE, 16)); |
| } |
| |
| /** Calculates L2 normalization between two inputs. |
| * |
| * @param[in] a First input. Supported data types: S16, S32 |
| * @param[in] b Second input. Supported data types: S16, S32 |
| * |
| * @return L2 normalization magnitude result. Supported data types: S16, S32 |
| */ |
| inline VEC_DATA_TYPE(DATA_TYPE, 16) magnitude_l2(int16 a, int16 b) |
| { |
| return CONVERT_SAT((sqrt(convert_float16((convert_uint16(a * a) + convert_uint16(b * b)))) + 0.5f), |
| VEC_DATA_TYPE(DATA_TYPE, 16)); |
| } |
| |
| /** Calculates unsigned phase between two inputs. |
| * |
| * @param[in] a First input. Supported data types: S16, S32 |
| * @param[in] b Second input. Supported data types: S16, S32 |
| * |
| * @return Unsigned phase mapped in the interval [0, 180]. Supported data types: U8 |
| */ |
| inline uchar16 phase_unsigned(VEC_DATA_TYPE(DATA_TYPE, 16) a, VEC_DATA_TYPE(DATA_TYPE, 16) b) |
| { |
| float16 angle_deg_f32 = atan2pi(convert_float16(b), convert_float16(a)) * (float16)180.0f; |
| angle_deg_f32 = select(angle_deg_f32, (float16)180.0f + angle_deg_f32, angle_deg_f32 < (float16)0.0f); |
| return convert_uchar16(angle_deg_f32); |
| } |
| |
| /** Calculates signed phase between two inputs. |
| * |
| * @param[in] a First input. Supported data types: S16, S32 |
| * @param[in] b Second input. Supported data types: S16, S32 |
| * |
| * @return Signed phase mapped in the interval [0, 256). Supported data types: U8 |
| */ |
| inline uchar16 phase_signed(VEC_DATA_TYPE(DATA_TYPE, 16) a, VEC_DATA_TYPE(DATA_TYPE, 16) b) |
| { |
| float16 arct = atan2pi(convert_float16(b), convert_float16(a)); |
| arct = select(arct, arct + 2, arct < 0.0f); |
| |
| return convert_uchar16(convert_int16(mad(arct, 128, 0.5f)) & (int16)0xFFu); |
| } |
| |
| #if(1 == MAGNITUDE) |
| #define MAGNITUDE_OP(x, y) magnitude_l1((x), (y)) |
| #elif(2 == MAGNITUDE) |
| #define MAGNITUDE_OP(x, y) magnitude_l2(convert_int16(x), convert_int16(y)) |
| #else /* MAGNITUDE */ |
| #define MAGNITUDE_OP(x, y) |
| #endif /* MAGNITUDE */ |
| |
| #if(1 == PHASE) |
| #define PHASE_OP(x, y) phase_unsigned((x), (y)) |
| #elif(2 == PHASE) |
| #define PHASE_OP(x, y) phase_signed((x), (y)) |
| #else /* PHASE */ |
| #define PHASE_OP(x, y) |
| #endif /* PHASE */ |
| |
| /** Calculate the magnitude and phase of given the gradients of an image. |
| * |
| * @note Magnitude calculation supported: L1 normalization(type = 1) and L2 normalization(type = 2). |
| * @note Phase calculation supported: Unsigned(type = 1) [0,128] and Signed(type = 2) [0,256). |
| * |
| * @attention To enable phase calculation -DPHASE="phase_calculation_type_id" must be provided at compile time. eg -DPHASE=1 |
| * @attention To enable magnitude calculation -DMAGNITUDE="magnitude_calculation_type_id" must be provided at compile time. eg -DMAGNITUDE=1 |
| * @attention Datatype of the two inputs is passed at compile time using -DDATA_TYPE. e.g -DDATA_TYPE=short. Supported data_types are: short and int |
| * |
| * @param[in] gx_ptr Pointer to the first source image (gradient X). Supported data types: S16, S32 |
| * @param[in] gx_stride_x Stride of the source image in X dimension (in bytes) |
| * @param[in] gx_step_x gx_stride_x * number of elements along X processed per workitem(in bytes) |
| * @param[in] gx_stride_y Stride of the source image in Y dimension (in bytes) |
| * @param[in] gx_step_y gx_stride_y * number of elements along Y processed per workitem(in bytes) |
| * @param[in] gx_offset_first_element_in_bytes The offset of the first element in the source image |
| * @param[in] gy_ptr Pointer to the second source image (gradient Y) . Supported data types: S16, S32 |
| * @param[in] gy_stride_x Stride of the destination image in X dimension (in bytes) |
| * @param[in] gy_step_x gy_stride_x * number of elements along X processed per workitem(in bytes) |
| * @param[in] gy_stride_y Stride of the destination image in Y dimension (in bytes) |
| * @param[in] gy_step_y gy_stride_y * number of elements along Y processed per workitem(in bytes) |
| * @param[in] gy_offset_first_element_in_bytes The offset of the first element in the destination image |
| * @param[out] magnitude_ptr Pointer to the magnitude destination image. Supported data types: S16, S32 |
| * @param[in] magnitude_stride_x Stride of the source image in X dimension (in bytes) |
| * @param[in] magnitude_step_x magnitude_stride_x * number of elements along X processed per workitem(in bytes) |
| * @param[in] magnitude_stride_y Stride of the source image in Y dimension (in bytes) |
| * @param[in] magnitude_step_y magnitude_stride_y * number of elements along Y processed per workitem(in bytes) |
| * @param[in] magnitude_offset_first_element_in_bytes The offset of the first element in the source image |
| * @param[out] phase_ptr Pointer to the phase destination image. Supported data types: U8 |
| * @param[in] phase_stride_x Stride of the destination image in X dimension (in bytes) |
| * @param[in] phase_step_x phase_stride_x * number of elements along X processed per workitem(in bytes) |
| * @param[in] phase_stride_y Stride of the destination image in Y dimension (in bytes) |
| * @param[in] phase_step_y phase_stride_y * number of elements along Y processed per workitem(in bytes) |
| * @param[in] phase_offset_first_element_in_bytes The offset of the first element in the destination image |
| * */ |
| __kernel void magnitude_phase( |
| IMAGE_DECLARATION(gx), |
| IMAGE_DECLARATION(gy) |
| #ifdef MAGNITUDE |
| , |
| IMAGE_DECLARATION(magnitude) |
| #endif /* MAGNITUDE */ |
| #ifdef PHASE |
| , |
| IMAGE_DECLARATION(phase) |
| #endif /* PHASE */ |
| ) |
| { |
| // Get pixels pointer |
| Image gx = CONVERT_TO_IMAGE_STRUCT(gx); |
| Image gy = CONVERT_TO_IMAGE_STRUCT(gy); |
| |
| // Load values |
| VEC_DATA_TYPE(DATA_TYPE, 16) |
| in_a = vload16(0, (__global DATA_TYPE *)gx.ptr); |
| VEC_DATA_TYPE(DATA_TYPE, 16) |
| in_b = vload16(0, (__global DATA_TYPE *)gy.ptr); |
| |
| // Calculate and store the results |
| #ifdef MAGNITUDE |
| Image magnitude = CONVERT_TO_IMAGE_STRUCT(magnitude); |
| vstore16(MAGNITUDE_OP(in_a, in_b), 0, (__global DATA_TYPE *)magnitude.ptr); |
| #endif /* MAGNITUDE */ |
| #ifdef PHASE |
| Image phase = CONVERT_TO_IMAGE_STRUCT(phase); |
| vstore16(PHASE_OP(in_a, in_b), 0, phase.ptr); |
| #endif /* PHASE */ |
| } |