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/*
* Copyright 2011-2013 Blender Foundation
*
* 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
*
* 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.
*/
#pragma once
CCL_NAMESPACE_BEGIN
/* Interpolated lookup table access */
ccl_device float lookup_table_read(const KernelGlobals *kg, float x, int offset, int size)
{
x = saturate(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_tex_fetch(__lookup_table, index + offset);
if (t == 0.0f)
return data0;
float data1 = kernel_tex_fetch(__lookup_table, nindex + offset);
return (1.0f - t) * data0 + t * data1;
}
ccl_device float lookup_table_read_2D(
const KernelGlobals *kg, float x, float y, int offset, int xsize, int ysize)
{
y = saturate(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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