/*M/////////////////////////////////////////////////////////////////////////////////////// // // IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING. // // By downloading, copying, installing or using the software you agree to this license. // If you do not agree to this license, do not download, install, // copy or use the software. // // // License Agreement // For Open Source Computer Vision Library // // Copyright (C) 2010-2012, Multicoreware, Inc., all rights reserved. // Copyright (C) 2010,2014, Advanced Micro Devices, Inc., all rights reserved. // Third party copyrights are property of their respective owners. // // @Authors // Xiaopeng Fu, fuxiaopeng2222@163.com // Peng Xiao, pengxiao@outlook.com // // Redistribution and use in source and binary forms, with or without modification, // are permitted provided that the following conditions are met: // // * Redistribution's of source code must retain the above copyright notice, // this list of conditions and the following disclaimer. // // * Redistribution's in binary form must reproduce the above copyright notice, // this list of conditions and the following disclaimer in the documentation // and/or other materials provided with the distribution. // // * The name of the copyright holders may not be used to endorse or promote products // derived from this software without specific prior written permission. // // This software is provided by the copyright holders and contributors as is and // any express or implied warranties, including, but not limited to, the implied // warranties of merchantability and fitness for a particular purpose are disclaimed. // In no event shall the Intel Corporation or contributors be liable for any direct, // indirect, incidental, special, exemplary, or consequential damages // (including, but not limited to, procurement of substitute goods or services; // loss of use, data, or profits; or business interruption) however caused // and on any theory of liability, whether in contract, strict liability, // or tort (including negligence or otherwise) arising in any way out of // the use of this software, even if advised of the possibility of such damage. // //M*/ float distance_(__global const float * center, __global const float * src, int feature_length) { float res = 0; float4 v0, v1, v2; int i = 0; #ifdef L1_DIST float4 sum = (float4)(0.0f); #endif for ( ; i <= feature_length - 4; i += 4) { v0 = vload4(0, center + i); v1 = vload4(0, src + i); v2 = v1 - v0; #ifdef L1_DIST v0 = fabs(v2); sum += v0; #else res += dot(v2, v2); #endif } #ifdef L1_DIST res = sum.x + sum.y + sum.z + sum.w; #endif for ( ; i < feature_length; ++i) { float t0 = src[i]; float t1 = center[i]; #ifdef L1_DIST res += fabs(t0 - t1); #else float t2 = t0 - t1; res += t2 * t2; #endif } return res; } __kernel void distanceToCenters(__global const float * src, __global const float * centers, __global float * dists, int feature_length, int src_step, int centers_step, int features_count, int centers_count, int src_offset, int centers_offset) { int gid = get_global_id(0); if (gid < (features_count * centers_count)) { int feature_index = gid / centers_count; int center_index = gid % centers_count; int center_idx = mad24(center_index, centers_step, centers_offset); int src_idx = mad24(feature_index, src_step, src_offset); dists[gid] = distance_(centers + center_idx, src + src_idx, feature_length); } }