9cfc7967dd
* Replace license text in headers with SPDX identifiers. * Remove specific license info from outdated readme.txt, instead leave details to the source files. * Add list of SPDX license identifiers used, and corresponding license texts. * Update copyright dates while we're at it. Ref D14069, T95597
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2011-2022 Blender Foundation */
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#pragma once
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CCL_NAMESPACE_BEGIN
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/* Interpolated lookup table access */
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ccl_device float lookup_table_read(KernelGlobals kg, float x, int offset, int size)
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{
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x = saturatef(x) * (size - 1);
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int index = min(float_to_int(x), size - 1);
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int nindex = min(index + 1, size - 1);
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float t = x - index;
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float data0 = kernel_tex_fetch(__lookup_table, index + offset);
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if (t == 0.0f)
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return data0;
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float data1 = kernel_tex_fetch(__lookup_table, nindex + offset);
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return (1.0f - t) * data0 + t * data1;
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}
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ccl_device float lookup_table_read_2D(
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KernelGlobals kg, float x, float y, int offset, int xsize, int ysize)
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{
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y = saturatef(y) * (ysize - 1);
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int index = min(float_to_int(y), ysize - 1);
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int nindex = min(index + 1, ysize - 1);
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float t = y - index;
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float data0 = lookup_table_read(kg, x, offset + xsize * index, xsize);
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if (t == 0.0f)
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return data0;
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float data1 = lookup_table_read(kg, x, offset + xsize * nindex, xsize);
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return (1.0f - t) * data0 + t * data1;
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}
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CCL_NAMESPACE_END
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