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/*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) 2010-2012, Advanced Micro Devices, Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
//
// @Authors
// Zhang Chunpeng chunpeng@multicorewareinc.com
// Dachuan Zhao, dachuan@multicorewareinc.com
// Yao Wang, yao@multicorewareinc.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*/
///////////////////////////////////////////////////////////////////////
//////////////////////// Generic PyrUp //////////////////////////////
///////////////////////////////////////////////////////////////////////
#ifdef DOUBLE_SUPPORT
#ifdef cl_amd_fp64
#pragma OPENCL EXTENSION cl_amd_fp64:enable
#elif defined (cl_khr_fp64)
#pragma OPENCL EXTENSION cl_khr_fp64:enable
#endif
#endif
#if cn != 3
#define loadpix(addr) *(__global const T*)(addr)
#define storepix(val, addr) *(__global T*)(addr) = (val)
#define PIXSIZE ((int)sizeof(T))
#else
#define loadpix(addr) vload3(0, (__global const T1*)(addr))
#define storepix(val, addr) vstore3((val), 0, (__global T1*)(addr))
#define PIXSIZE ((int)sizeof(T1)*3)
#endif
#define noconvert
__kernel void pyrUp(__global const uchar * src, int src_step, int src_offset, int src_rows, int src_cols,
__global uchar * dst, int dst_step, int dst_offset, int dst_rows, int dst_cols)
{
const int x = get_global_id(0);
const int y = get_global_id(1);
const int lsizex = get_local_size(0);
const int lsizey = get_local_size(1);
const int tidx = get_local_id(0);
const int tidy = get_local_id(1);
__local FT s_srcPatch[10][10];
__local FT s_dstPatch[20][16];
__global uchar * dstData = dst + dst_offset;
__global const uchar * srcData = src + src_offset;
if( tidx < 10 && tidy < 10 )
{
int srcx = mad24((int)get_group_id(0), lsizex>>1, tidx) - 1;
int srcy = mad24((int)get_group_id(1), lsizey>>1, tidy) - 1;
srcx = abs(srcx);
srcx = min(src_cols - 1, srcx);
srcy = abs(srcy);
srcy = min(src_rows - 1, srcy);
s_srcPatch[tidy][tidx] = convertToFT(loadpix(srcData + srcy * src_step + srcx * PIXSIZE));
}
barrier(CLK_LOCAL_MEM_FENCE);
FT sum = 0.f;
const FT evenFlag = (FT)((tidx & 1) == 0);
const FT oddFlag = (FT)((tidx & 1) != 0);
const bool eveny = ((tidy & 1) == 0);
const FT co1 = 0.375f;
const FT co2 = 0.25f;
const FT co3 = 0.0625f;
if(eveny)
{
sum = ( evenFlag* co3 ) * s_srcPatch[1 + (tidy >> 1)][1 + ((tidx - 2) >> 1)];
sum = sum + ( oddFlag * co2 ) * s_srcPatch[1 + (tidy >> 1)][1 + ((tidx - 1) >> 1)];
sum = sum + ( evenFlag* co1 ) * s_srcPatch[1 + (tidy >> 1)][1 + ((tidx ) >> 1)];
sum = sum + ( oddFlag * co2 ) * s_srcPatch[1 + (tidy >> 1)][1 + ((tidx + 1) >> 1)];
sum = sum + ( evenFlag* co3 ) * s_srcPatch[1 + (tidy >> 1)][1 + ((tidx + 2) >> 1)];
}
s_dstPatch[2 + tidy][tidx] = sum;
if (tidy < 2)
{
sum = 0;
if (eveny)
{
sum = (evenFlag * co3 ) * s_srcPatch[lsizey-16][1 + ((tidx - 2) >> 1)];
sum = sum + ( oddFlag * co2 ) * s_srcPatch[lsizey-16][1 + ((tidx - 1) >> 1)];
sum = sum + (evenFlag * co1 ) * s_srcPatch[lsizey-16][1 + ((tidx ) >> 1)];
sum = sum + ( oddFlag * co2 ) * s_srcPatch[lsizey-16][1 + ((tidx + 1) >> 1)];
sum = sum + (evenFlag * co3 ) * s_srcPatch[lsizey-16][1 + ((tidx + 2) >> 1)];
}
s_dstPatch[tidy][tidx] = sum;
}
if (tidy > 13)
{
sum = 0;
if (eveny)
{
sum = (evenFlag * co3) * s_srcPatch[lsizey-7][1 + ((tidx - 2) >> 1)];
sum = sum + ( oddFlag * co2) * s_srcPatch[lsizey-7][1 + ((tidx - 1) >> 1)];
sum = sum + (evenFlag * co1) * s_srcPatch[lsizey-7][1 + ((tidx ) >> 1)];
sum = sum + ( oddFlag * co2) * s_srcPatch[lsizey-7][1 + ((tidx + 1) >> 1)];
sum = sum + (evenFlag * co3) * s_srcPatch[lsizey-7][1 + ((tidx + 2) >> 1)];
}
s_dstPatch[4 + tidy][tidx] = sum;
}
barrier(CLK_LOCAL_MEM_FENCE);
sum = co3 * s_dstPatch[2 + tidy - 2][tidx];
sum = sum + co2 * s_dstPatch[2 + tidy - 1][tidx];
sum = sum + co1 * s_dstPatch[2 + tidy ][tidx];
sum = sum + co2 * s_dstPatch[2 + tidy + 1][tidx];
sum = sum + co3 * s_dstPatch[2 + tidy + 2][tidx];
if ((x < dst_cols) && (y < dst_rows))
storepix(convertToT(4.0f * sum), dstData + y * dst_step + x * PIXSIZE);
}