65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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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_data_fetch(lookup_table, index + offset);
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if (t == 0.0f) {
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return data0;
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}
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float data1 = kernel_data_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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}
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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_device float lookup_table_read_3D(
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KernelGlobals kg, float x, float y, float z, int offset, int xsize, int ysize, int zsize)
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{
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z = saturatef(z) * (zsize - 1);
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int index = min(float_to_int(z), zsize - 1);
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int nindex = min(index + 1, zsize - 1);
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float t = z - index;
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float data0 = lookup_table_read_2D(kg, x, y, offset + xsize * ysize * index, xsize, ysize);
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if (t == 0.0f) {
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return data0;
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}
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float data1 = lookup_table_read_2D(kg, x, y, offset + xsize * ysize * nindex, xsize, ysize);
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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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