Campbell Barton
e12c08e8d1
Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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CCL_NAMESPACE_BEGIN
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/* Turbulence */
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ccl_device_noinline float noise_turbulence(float3 p, float octaves, int hard)
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{
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float fscale = 1.0f;
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float amp = 1.0f;
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float sum = 0.0f;
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int i, n;
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octaves = clamp(octaves, 0.0f, 16.0f);
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n = float_to_int(octaves);
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for (i = 0; i <= n; i++) {
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float t = noise(fscale * p);
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if (hard)
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t = fabsf(2.0f * t - 1.0f);
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sum += t * amp;
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amp *= 0.5f;
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fscale *= 2.0f;
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}
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float rmd = octaves - floorf(octaves);
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if (rmd != 0.0f) {
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float t = noise(fscale * p);
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if (hard)
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t = fabsf(2.0f * t - 1.0f);
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float sum2 = sum + t * amp;
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sum *= ((float)(1 << n) / (float)((1 << (n + 1)) - 1));
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sum2 *= ((float)(1 << (n + 1)) / (float)((1 << (n + 2)) - 1));
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return (1.0f - rmd) * sum + rmd * sum2;
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}
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else {
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sum *= ((float)(1 << n) / (float)((1 << (n + 1)) - 1));
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return sum;
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}
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}
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CCL_NAMESPACE_END
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