forked from bartvdbraak/blender
f9688d88ff
This mainly happens when over-saturating already saturated color. After some discussion with Campbell and loads of tests we decided to clamp the result RGB color. As an alternative we might want to clamp corrected HSV values instead, but that would lead to some larger changes in the render results. TODO: The same is to be done for compositor nodes.
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef __SVM_HSV_H__
|
|
#define __SVM_HSV_H__
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
ccl_device void svm_node_hsv(KernelGlobals *kg, ShaderData *sd, float *stack, uint in_color_offset, uint fac_offset, uint out_color_offset, int *offset)
|
|
{
|
|
/* read extra data */
|
|
uint4 node1 = read_node(kg, offset);
|
|
|
|
float fac = stack_load_float(stack, fac_offset);
|
|
float3 in_color = stack_load_float3(stack, in_color_offset);
|
|
float3 color = in_color;
|
|
|
|
float hue = stack_load_float(stack, node1.y);
|
|
float sat = stack_load_float(stack, node1.z);
|
|
float val = stack_load_float(stack, node1.w);
|
|
|
|
color = rgb_to_hsv(color);
|
|
|
|
/* remember: fmod doesn't work for negative numbers here */
|
|
color.x += hue + 0.5f;
|
|
color.x = fmodf(color.x, 1.0f);
|
|
color.y *= sat;
|
|
color.z *= val;
|
|
|
|
color = hsv_to_rgb(color);
|
|
|
|
color.x = fac*color.x + (1.0f - fac)*in_color.x;
|
|
color.y = fac*color.y + (1.0f - fac)*in_color.y;
|
|
color.z = fac*color.z + (1.0f - fac)*in_color.z;
|
|
|
|
/* Clamp color to prevent negative values cauzed by oversaturation. */
|
|
color.x = max(color.x, 0.0f);
|
|
color.y = max(color.y, 0.0f);
|
|
color.z = max(color.z, 0.0f);
|
|
|
|
if (stack_valid(out_color_offset))
|
|
stack_store_float3(stack, out_color_offset, color);
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|
|
|
|
#endif /* __SVM_HSV_H__ */
|
|
|