forked from bartvdbraak/blender
64 lines
1.9 KiB
C
64 lines
1.9 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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#ifndef __SVM_HSV_H__
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#define __SVM_HSV_H__
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CCL_NAMESPACE_BEGIN
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ccl_device void svm_node_hsv(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
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{
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uint in_color_offset, fac_offset, out_color_offset;
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uint hue_offset, sat_offset, val_offset;
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decode_node_uchar4(node.y, &in_color_offset, &fac_offset, &out_color_offset, NULL);
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decode_node_uchar4(node.z, &hue_offset, &sat_offset, &val_offset, NULL);
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float fac = stack_load_float(stack, fac_offset);
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float3 in_color = stack_load_float3(stack, in_color_offset);
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float3 color = in_color;
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float hue = stack_load_float(stack, hue_offset);
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float sat = stack_load_float(stack, sat_offset);
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float val = stack_load_float(stack, val_offset);
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color = rgb_to_hsv(color);
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/* remember: fmod doesn't work for negative numbers here */
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color.x += hue + 0.5f;
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color.x = fmodf(color.x, 1.0f);
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color.y *= sat;
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color.z *= val;
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color = hsv_to_rgb(color);
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color.x = fac*color.x + (1.0f - fac)*in_color.x;
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color.y = fac*color.y + (1.0f - fac)*in_color.y;
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color.z = fac*color.z + (1.0f - fac)*in_color.z;
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/* Clamp color to prevent negative values caused by oversaturation. */
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color.x = max(color.x, 0.0f);
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color.y = max(color.y, 0.0f);
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color.z = max(color.z, 0.0f);
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if(stack_valid(out_color_offset))
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stack_store_float3(stack, out_color_offset, color);
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}
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CCL_NAMESPACE_END
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#endif /* __SVM_HSV_H__ */
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