Brecht Van Lommel
ec559912fb
Values outside the 0..1 range produce negative colors, so now clamp to that range everywhere. Also fixes improper handling of hue > 2.0 in some places.
45 lines
1.2 KiB
Plaintext
45 lines
1.2 KiB
Plaintext
/*
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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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#include "stdosl.h"
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#include "node_color.h"
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shader node_hsv(
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float Hue = 0.5,
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float Saturation = 1.0,
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float Value = 1.0,
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float Fac = 0.5,
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color ColorIn = 0.0,
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output color ColorOut = 0.0)
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{
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color Color = rgb_to_hsv(ColorIn);
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// remember: fmod doesn't work for negative numbers
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Color[0] = fmod(Color[0] + Hue + 0.5, 1.0);
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Color[1] *= clamp(Saturation, 0.0, 1.0);
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Color[2] *= Value;
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Color = hsv_to_rgb(Color);
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// Clamp color to prevent negative values cauzed by oversaturation.
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Color[0] = max(Color[0], 0.0);
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Color[1] = max(Color[1], 0.0);
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Color[2] = max(Color[2], 0.0);
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ColorOut = mix(ColorIn, Color, Fac);
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}
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