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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.
- */
- #include "stdosl.h"
- #include "node_color.h"
- shader node_hsv(float Hue = 0.5,
- float Saturation = 1.0,
- float Value = 1.0,
- float Fac = 0.5,
- color ColorIn = 0.0,
- output color ColorOut = 0.0)
- {
- color Color = rgb_to_hsv(ColorIn);
- // remember: fmod doesn't work for negative numbers
- Color[0] = fmod(Color[0] + Hue + 0.5, 1.0);
- Color[1] = clamp(Color[1] * Saturation, 0.0, 1.0);
- Color[2] *= Value;
- Color = hsv_to_rgb(Color);
- // Clamp color to prevent negative values cauzed by oversaturation.
- Color[0] = max(Color[0], 0.0);
- Color[1] = max(Color[1], 0.0);
- Color[2] = max(Color[2], 0.0);
- ColorOut = mix(ColorIn, Color, Fac);
- }
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