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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
*/
#ifndef __UTIL_COLOR_H__
#define __UTIL_COLOR_H__
#include "util_math.h"
#include "util_types.h"
CCL_NAMESPACE_BEGIN
ccl_device float color_srgb_to_scene_linear(float c)
{
if(c < 0.04045f)
return (c < 0.0f)? 0.0f: c * (1.0f/12.92f);
else
return powf((c + 0.055f) * (1.0f / 1.055f), 2.4f);
}
ccl_device float color_scene_linear_to_srgb(float c)
{
if(c < 0.0031308f)
return (c < 0.0f)? 0.0f: c * 12.92f;
else
return 1.055f * powf(c, 1.0f / 2.4f) - 0.055f;
}
ccl_device float3 rgb_to_hsv(float3 rgb)
{
float cmax, cmin, h, s, v, cdelta;
float3 c;
cmax = fmaxf(rgb.x, fmaxf(rgb.y, rgb.z));
cmin = min(rgb.x, min(rgb.y, rgb.z));
cdelta = cmax - cmin;
v = cmax;
if(cmax != 0.0f) {
s = cdelta/cmax;
}
else {
s = 0.0f;
h = 0.0f;
}
if(s == 0.0f) {
h = 0.0f;
}
else {
float3 cmax3 = make_float3(cmax, cmax, cmax);
c = (cmax3 - rgb)/cdelta;
if(rgb.x == cmax) h = c.z - c.y;
else if(rgb.y == cmax) h = 2.0f + c.x - c.z;
else h = 4.0f + c.y - c.x;
h /= 6.0f;
if(h < 0.0f)
h += 1.0f;
}
return make_float3(h, s, v);
}
ccl_device float3 hsv_to_rgb(float3 hsv)
{
float i, f, p, q, t, h, s, v;
float3 rgb;
h = hsv.x;
s = hsv.y;
v = hsv.z;
if(s == 0.0f) {
rgb = make_float3(v, v, v);
}
else {
if(h == 1.0f)
h = 0.0f;
h *= 6.0f;
i = floorf(h);
f = h - i;
rgb = make_float3(f, f, f);
p = v*(1.0f-s);
q = v*(1.0f-(s*f));
t = v*(1.0f-(s*(1.0f-f)));
if(i == 0.0f) rgb = make_float3(v, t, p);
else if(i == 1.0f) rgb = make_float3(q, v, p);
else if(i == 2.0f) rgb = make_float3(p, v, t);
else if(i == 3.0f) rgb = make_float3(p, q, v);
else if(i == 4.0f) rgb = make_float3(t, p, v);
else rgb = make_float3(v, p, q);
}
return rgb;
}
ccl_device float3 xyY_to_xyz(float x, float y, float Y)
{
float X, Z;
if(y != 0.0f) X = (x / y) * Y;
else X = 0.0f;
if(y != 0.0f && Y != 0.0f) Z = (1.0f - x - y) / y * Y;
else Z = 0.0f;
return make_float3(X, Y, Z);
}
ccl_device float3 xyz_to_rgb(float x, float y, float z)
{
return make_float3(3.240479f * x + -1.537150f * y + -0.498535f * z,
-0.969256f * x + 1.875991f * y + 0.041556f * z,
0.055648f * x + -0.204043f * y + 1.057311f * z);
}
#ifndef __KERNEL_OPENCL__
ccl_device float3 color_srgb_to_scene_linear(float3 c)
{
return make_float3(
color_srgb_to_scene_linear(c.x),
color_srgb_to_scene_linear(c.y),
color_srgb_to_scene_linear(c.z));
}
ccl_device float3 color_scene_linear_to_srgb(float3 c)
{
return make_float3(
color_scene_linear_to_srgb(c.x),
color_scene_linear_to_srgb(c.y),
color_scene_linear_to_srgb(c.z));
}
#endif
ccl_device float linear_rgb_to_gray(float3 c)
{
return c.x*0.2126f + c.y*0.7152f + c.z*0.0722f;
}
CCL_NAMESPACE_END
#endif /* __UTIL_COLOR_H__ */
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