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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
#pragma once
CCL_NAMESPACE_BEGIN
/* Interpolated lookup table access */
ccl_device float lookup_table_read(KernelGlobals kg, float x, int offset, int size)
{
x = saturatef(x) * (size - 1);
int index = min(float_to_int(x), size - 1);
int nindex = min(index + 1, size - 1);
float t = x - index;
float data0 = kernel_data_fetch(lookup_table, index + offset);
if (t == 0.0f)
return data0;
float data1 = kernel_data_fetch(lookup_table, nindex + offset);
return (1.0f - t) * data0 + t * data1;
}
ccl_device float lookup_table_read_2D(
KernelGlobals kg, float x, float y, int offset, int xsize, int ysize)
{
y = saturatef(y) * (ysize - 1);
int index = min(float_to_int(y), ysize - 1);
int nindex = min(index + 1, ysize - 1);
float t = y - index;
float data0 = lookup_table_read(kg, x, offset + xsize * index, xsize);
if (t == 0.0f)
return data0;
float data1 = lookup_table_read(kg, x, offset + xsize * nindex, xsize);
return (1.0f - t) * data0 + t * data1;
}
CCL_NAMESPACE_END
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