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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
//
// \author Denis P. Shamonin and Marius Staring. Division of Image Processing,
// Department of Radiology, Leiden, The Netherlands
//
// \note This work was funded by the Netherlands Organisation for
// Scientific Research (NWO NRG-2010.02 and NWO 639.021.124).
//
// OpenCL implementation of itk::NearestNeighborInterpolateImageFunction
//------------------------------------------------------------------------------
#ifdef DIM_1
float evaluate_at_continuous_index_1d(
const float index,
__global const INPIXELTYPE *in,
const uint size,
const int start_index,
const int end_index )
{
uint nindex = convert_continuous_index_to_nearest_index_1d( index );
uint gidx = nindex;
float image_value = (float)( in[gidx] );
return image_value;
}
#endif // DIM_1
//------------------------------------------------------------------------------
#ifdef DIM_2
float evaluate_at_continuous_index_2d(
const float2 index,
__global const INPIXELTYPE *in,
const uint2 size,
const int2 start_index,
const int2 end_index )
{
uint2 nindex = convert_continuous_index_to_nearest_index_2d( index );
uint gidx = mad24( size.x, nindex.y, nindex.x );
float image_value = (float)( in[gidx] );
return image_value;
}
#endif // DIM_2
//------------------------------------------------------------------------------
#ifdef DIM_3
float evaluate_at_continuous_index_3d(
const float3 index,
__global const INPIXELTYPE *in,
const uint3 size,
const int3 start_index,
const int3 end_index )
{
uint3 nindex = convert_continuous_index_to_nearest_index_3d( index );
uint gidx = mad24( size.x, mad24( nindex.z, size.y, nindex.y ), nindex.x );
float image_value = (float)( in[gidx] );
return image_value;
}
#endif // DIM_3
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