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1309 行
45 KiB
1309 行
45 KiB
#ifndef __ACES__
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#define __ACES__
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/**
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* https://github.com/ampas/aces-dev
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*
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* Academy Color Encoding System (ACES) software and tools are provided by the
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* Academy under the following terms and conditions: A worldwide, royalty-free,
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* non-exclusive right to copy, modify, create derivatives, and use, in source and
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* binary forms, is hereby granted, subject to acceptance of this license.
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*
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* Copyright 2015 Academy of Motion Picture Arts and Sciences (A.M.P.A.S.).
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* Portions contributed by others as indicated. All rights reserved.
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*
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* Performance of any of the aforementioned acts indicates acceptance to be bound
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* by the following terms and conditions:
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*
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* * Copies of source code, in whole or in part, must retain the above copyright
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* notice, this list of conditions and the Disclaimer of Warranty.
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*
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* * Use in binary form must retain the above copyright notice, this list of
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* conditions and the Disclaimer of Warranty in the documentation and/or other
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* materials provided with the distribution.
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*
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* * Nothing in this license shall be deemed to grant any rights to trademarks,
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* copyrights, patents, trade secrets or any other intellectual property of
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* A.M.P.A.S. or any contributors, except as expressly stated herein.
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*
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* * Neither the name "A.M.P.A.S." nor the name of any other contributors to this
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* software may be used to endorse or promote products derivative of or based on
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* this software without express prior written permission of A.M.P.A.S. or the
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* contributors, as appropriate.
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*
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* This license shall be construed pursuant to the laws of the State of
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* California, and any disputes related thereto shall be subject to the
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* jurisdiction of the courts therein.
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*
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* Disclaimer of Warranty: THIS SOFTWARE IS PROVIDED BY A.M.P.A.S. AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
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* NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL A.M.P.A.S., OR ANY
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* CONTRIBUTORS OR DISTRIBUTORS, BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, RESITUTIONARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, THE ACADEMY SPECIFICALLY
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* DISCLAIMS ANY REPRESENTATIONS OR WARRANTIES WHATSOEVER RELATED TO PATENT OR
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* OTHER INTELLECTUAL PROPERTY RIGHTS IN THE ACADEMY COLOR ENCODING SYSTEM, OR
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* APPLICATIONS THEREOF, HELD BY PARTIES OTHER THAN A.M.P.A.S.,WHETHER DISCLOSED OR
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* UNDISCLOSED.
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*/
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#include "Common.hlsl"
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#define ACEScc_MAX 1.4679964
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#define ACEScc_MIDGRAY 0.4135884
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//
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// Precomputed matrices (pre-transposed)
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// See https://github.com/ampas/aces-dev/blob/master/transforms/ctl/README-MATRIX.md
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//
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static const half3x3 sRGB_2_AP0 = {
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0.4397010, 0.3829780, 0.1773350,
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0.0897923, 0.8134230, 0.0967616,
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0.0175440, 0.1115440, 0.8707040
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};
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static const half3x3 sRGB_2_AP1 = {
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0.61319, 0.33951, 0.04737,
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0.07021, 0.91634, 0.01345,
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0.02062, 0.10957, 0.86961
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};
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static const half3x3 AP0_2_sRGB = {
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2.52169, -1.13413, -0.38756,
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-0.27648, 1.37272, -0.09624,
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-0.01538, -0.15298, 1.16835,
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};
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static const half3x3 AP1_2_sRGB = {
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1.70505, -0.62179, -0.08326,
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-0.13026, 1.14080, -0.01055,
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-0.02400, -0.12897, 1.15297,
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};
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static const half3x3 AP0_2_AP1_MAT = {
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1.4514393161, -0.2365107469, -0.2149285693,
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-0.0765537734, 1.1762296998, -0.0996759264,
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0.0083161484, -0.0060324498, 0.9977163014
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};
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static const half3x3 AP1_2_AP0_MAT = {
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0.6954522414, 0.1406786965, 0.1638690622,
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0.0447945634, 0.8596711185, 0.0955343182,
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-0.0055258826, 0.0040252103, 1.0015006723
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};
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static const half3x3 AP1_2_XYZ_MAT = {
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0.6624541811, 0.1340042065, 0.1561876870,
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0.2722287168, 0.6740817658, 0.0536895174,
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-0.0055746495, 0.0040607335, 1.0103391003
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};
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static const half3x3 XYZ_2_AP1_MAT = {
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1.6410233797, -0.3248032942, -0.2364246952,
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-0.6636628587, 1.6153315917, 0.0167563477,
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0.0117218943, -0.0082844420, 0.9883948585
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};
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static const half3x3 XYZ_2_REC709_MAT = {
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3.2409699419, -1.5373831776, -0.4986107603,
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-0.9692436363, 1.8759675015, 0.0415550574,
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0.0556300797, -0.2039769589, 1.0569715142
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};
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static const half3x3 XYZ_2_REC2020_MAT = {
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1.7166511880, -0.3556707838, -0.2533662814,
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-0.6666843518, 1.6164812366, 0.0157685458,
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0.0176398574, -0.0427706133, 0.9421031212
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};
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static const half3x3 XYZ_2_DCIP3_MAT = {
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2.7253940305, -1.0180030062, -0.4401631952,
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-0.7951680258, 1.6897320548, 0.0226471906,
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0.0412418914, -0.0876390192, 1.1009293786
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};
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static const half3 AP1_RGB2Y = half3(0.272229, 0.674082, 0.0536895);
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static const half3x3 RRT_SAT_MAT = {
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0.9708890, 0.0269633, 0.00214758,
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0.0108892, 0.9869630, 0.00214758,
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0.0108892, 0.0269633, 0.96214800
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};
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static const half3x3 ODT_SAT_MAT = {
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0.949056, 0.0471857, 0.00375827,
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0.019056, 0.9771860, 0.00375827,
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0.019056, 0.0471857, 0.93375800
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};
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static const half3x3 D60_2_D65_CAT = {
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0.98722400, -0.00611327, 0.0159533,
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-0.00759836, 1.00186000, 0.0053302,
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0.00307257, -0.00509595, 1.0816800
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};
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//
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// Unity to ACES
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//
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// converts Unity raw (sRGB primaries) to
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// ACES2065-1 (AP0 w/ linear encoding)
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//
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half3 unity_to_ACES(half3 x)
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{
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x = mul(sRGB_2_AP0, x);
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return x;
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}
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//
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// ACES to Unity
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//
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// converts ACES2065-1 (AP0 w/ linear encoding)
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// Unity raw (sRGB primaries) to
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//
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half3 ACES_to_unity(half3 x)
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{
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x = mul(AP0_2_sRGB, x);
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return x;
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}
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//
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// Unity to ACEScg
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//
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// converts Unity raw (sRGB primaries) to
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// ACEScg (AP1 w/ linear encoding)
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//
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half3 unity_to_ACEScg(half3 x)
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{
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x = mul(sRGB_2_AP1, x);
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return x;
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}
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//
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// ACEScg to Unity
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//
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// converts ACEScg (AP1 w/ linear encoding) to
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// Unity raw (sRGB primaries)
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//
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half3 ACEScg_to_unity(half3 x)
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{
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x = mul(AP1_2_sRGB, x);
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return x;
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}
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//
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// ACES Color Space Conversion - ACES to ACEScc
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//
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// converts ACES2065-1 (AP0 w/ linear encoding) to
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// ACEScc (AP1 w/ logarithmic encoding)
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//
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// This transform follows the formulas from section 4.4 in S-2014-003
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//
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half ACES_to_ACEScc(half x)
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{
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if (x <= 0.0)
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return -0.35828683; // = (log2(pow(2.0, -15.0) * 0.5) + 9.72) / 17.52
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else if (x < pow(2.0, -15.0))
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return (log2(pow(2.0, -16.0) + x * 0.5) + 9.72) / 17.52;
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else // (x >= pow(2.0, -15.0))
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return (log2(x) + 9.72) / 17.52;
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}
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half3 ACES_to_ACEScc(half3 x)
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{
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x = clamp(x, 0.0, HALF_MAX);
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// x is clamped to [0, HALF_MAX], skip the <= 0 check
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return (x < 0.00003051757) ? (log2(0.00001525878 + x * 0.5) + 9.72) / 17.52 : (log2(x) + 9.72) / 17.52;
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/*
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return half3(
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ACES_to_ACEScc(x.r),
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ACES_to_ACEScc(x.g),
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ACES_to_ACEScc(x.b)
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);
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*/
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}
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//
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// ACES Color Space Conversion - ACEScc to ACES
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//
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// converts ACEScc (AP1 w/ ACESlog encoding) to
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// ACES2065-1 (AP0 w/ linear encoding)
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//
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// This transform follows the formulas from section 4.4 in S-2014-003
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//
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half ACEScc_to_ACES(half x)
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{
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// TODO: Optimize me
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if (x < -0.3013698630) // (9.72 - 15) / 17.52
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return (pow(2.0, x * 17.52 - 9.72) - pow(2.0, -16.0)) * 2.0;
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else if (x < (log2(HALF_MAX) + 9.72) / 17.52)
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return pow(2.0, x * 17.52 - 9.72);
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else // (x >= (log2(HALF_MAX) + 9.72) / 17.52)
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return HALF_MAX;
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}
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half3 ACEScc_to_ACES(half3 x)
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{
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return half3(
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ACEScc_to_ACES(x.r),
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ACEScc_to_ACES(x.g),
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ACEScc_to_ACES(x.b)
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);
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}
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//
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// ACES Color Space Conversion - ACES to ACEScg
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//
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// converts ACES2065-1 (AP0 w/ linear encoding) to
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// ACEScg (AP1 w/ linear encoding)
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//
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half3 ACES_to_ACEScg(half3 x)
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{
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return mul(AP0_2_AP1_MAT, x);
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}
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//
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// ACES Color Space Conversion - ACEScg to ACES
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//
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// converts ACEScg (AP1 w/ linear encoding) to
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// ACES2065-1 (AP0 w/ linear encoding)
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//
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half3 ACEScg_to_ACES(half3 x)
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{
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return mul(AP1_2_AP0_MAT, x);
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}
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//
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// Reference Rendering Transform (RRT)
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//
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// Input is ACES
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// Output is OCES
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//
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half rgb_2_saturation(half3 rgb)
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{
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const half TINY = 1e-4;
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half mi = Min3(rgb.r, rgb.g, rgb.b);
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half ma = Max3(rgb.r, rgb.g, rgb.b);
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return (max(ma, TINY) - max(mi, TINY)) / max(ma, 1e-2);
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}
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half rgb_2_yc(half3 rgb)
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{
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const half ycRadiusWeight = 1.75;
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// Converts RGB to a luminance proxy, here called YC
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// YC is ~ Y + K * Chroma
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// Constant YC is a cone-shaped surface in RGB space, with the tip on the
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// neutral axis, towards white.
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// YC is normalized: RGB 1 1 1 maps to YC = 1
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//
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// ycRadiusWeight defaults to 1.75, although can be overridden in function
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// call to rgb_2_yc
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// ycRadiusWeight = 1 -> YC for pure cyan, magenta, yellow == YC for neutral
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// of same value
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// ycRadiusWeight = 2 -> YC for pure red, green, blue == YC for neutral of
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// same value.
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half r = rgb.x;
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half g = rgb.y;
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half b = rgb.z;
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half chroma = sqrt(b * (b - g) + g * (g - r) + r * (r - b));
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return (b + g + r + ycRadiusWeight * chroma) / 3.0;
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}
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half rgb_2_hue(half3 rgb)
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{
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// Returns a geometric hue angle in degrees (0-360) based on RGB values.
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// For neutral colors, hue is undefined and the function will return a quiet NaN value.
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half hue;
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if (rgb.x == rgb.y && rgb.y == rgb.z)
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hue = 0.0; // RGB triplets where RGB are equal have an undefined hue
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else
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hue = (180.0 / PI) * atan2(sqrt(3.0) * (rgb.y - rgb.z), 2.0 * rgb.x - rgb.y - rgb.z);
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if (hue < 0.0) hue = hue + 360.0;
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return hue;
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}
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half center_hue(half hue, half centerH)
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{
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half hueCentered = hue - centerH;
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if (hueCentered < -180.0) hueCentered = hueCentered + 360.0;
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else if (hueCentered > 180.0) hueCentered = hueCentered - 360.0;
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return hueCentered;
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}
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half sigmoid_shaper(half x)
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{
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// Sigmoid function in the range 0 to 1 spanning -2 to +2.
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half t = max(1.0 - abs(x / 2.0), 0.0);
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half y = 1.0 + FastSign(x) * (1.0 - t * t);
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return y / 2.0;
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}
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half glow_fwd(half ycIn, half glowGainIn, half glowMid)
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{
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half glowGainOut;
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if (ycIn <= 2.0 / 3.0 * glowMid)
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glowGainOut = glowGainIn;
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else if (ycIn >= 2.0 * glowMid)
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glowGainOut = 0.0;
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else
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glowGainOut = glowGainIn * (glowMid / ycIn - 1.0 / 2.0);
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return glowGainOut;
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}
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/*
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half cubic_basis_shaper
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(
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half x,
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half w // full base width of the shaper function (in degrees)
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)
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{
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half M[4][4] = {
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{ -1.0 / 6, 3.0 / 6, -3.0 / 6, 1.0 / 6 },
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{ 3.0 / 6, -6.0 / 6, 3.0 / 6, 0.0 / 6 },
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{ -3.0 / 6, 0.0 / 6, 3.0 / 6, 0.0 / 6 },
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{ 1.0 / 6, 4.0 / 6, 1.0 / 6, 0.0 / 6 }
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};
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half knots[5] = {
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-w / 2.0,
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-w / 4.0,
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0.0,
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w / 4.0,
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w / 2.0
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};
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half y = 0.0;
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if ((x > knots[0]) && (x < knots[4]))
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{
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half knot_coord = (x - knots[0]) * 4.0 / w;
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int j = knot_coord;
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half t = knot_coord - j;
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half monomials[4] = { t*t*t, t*t, t, 1.0 };
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// (if/else structure required for compatibility with CTL < v1.5.)
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if (j == 3)
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{
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y = monomials[0] * M[0][0] + monomials[1] * M[1][0] +
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monomials[2] * M[2][0] + monomials[3] * M[3][0];
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}
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else if (j == 2)
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{
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y = monomials[0] * M[0][1] + monomials[1] * M[1][1] +
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monomials[2] * M[2][1] + monomials[3] * M[3][1];
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}
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else if (j == 1)
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{
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y = monomials[0] * M[0][2] + monomials[1] * M[1][2] +
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monomials[2] * M[2][2] + monomials[3] * M[3][2];
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}
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else if (j == 0)
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{
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y = monomials[0] * M[0][3] + monomials[1] * M[1][3] +
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monomials[2] * M[2][3] + monomials[3] * M[3][3];
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}
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else
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{
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y = 0.0;
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}
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}
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return y * 3.0 / 2.0;
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}
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*/
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static const half3x3 M = {
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0.5, -1.0, 0.5,
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-1.0, 1.0, 0.0,
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0.5, 0.5, 0.0
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};
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half segmented_spline_c5_fwd(half x)
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{
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const half coefsLow[6] = { -4.0000000000, -4.0000000000, -3.1573765773, -0.4852499958, 1.8477324706, 1.8477324706 }; // coefs for B-spline between minPoint and midPoint (units of log luminance)
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const half coefsHigh[6] = { -0.7185482425, 2.0810307172, 3.6681241237, 4.0000000000, 4.0000000000, 4.0000000000 }; // coefs for B-spline between midPoint and maxPoint (units of log luminance)
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const half2 minPoint = half2(0.18 * exp2(-15.0), 0.0001); // {luminance, luminance} linear extension below this
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const half2 midPoint = half2(0.18, 0.48); // {luminance, luminance}
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const half2 maxPoint = half2(0.18 * exp2(18.0), 10000.0); // {luminance, luminance} linear extension above this
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const half slopeLow = 0.0; // log-log slope of low linear extension
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const half slopeHigh = 0.0; // log-log slope of high linear extension
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const int N_KNOTS_LOW = 4;
|
|
const int N_KNOTS_HIGH = 4;
|
|
|
|
// Check for negatives or zero before taking the log. If negative or zero,
|
|
// set to ACESMIN.1
|
|
float xCheck = x;
|
|
if (xCheck <= 0.0) xCheck = 0.00006103515; // = pow(2.0, -14.0);
|
|
|
|
half logx = log10(xCheck);
|
|
half logy;
|
|
|
|
if (logx <= log10(minPoint.x))
|
|
{
|
|
logy = logx * slopeLow + (log10(minPoint.y) - slopeLow * log10(minPoint.x));
|
|
}
|
|
else if ((logx > log10(minPoint.x)) && (logx < log10(midPoint.x)))
|
|
{
|
|
half knot_coord = (N_KNOTS_LOW - 1) * (logx - log10(minPoint.x)) / (log10(midPoint.x) - log10(minPoint.x));
|
|
int j = knot_coord;
|
|
half t = knot_coord - j;
|
|
|
|
half3 cf = half3(coefsLow[j], coefsLow[j + 1], coefsLow[j + 2]);
|
|
half3 monomials = half3(t * t, t, 1.0);
|
|
logy = dot(monomials, mul(M, cf));
|
|
}
|
|
else if ((logx >= log10(midPoint.x)) && (logx < log10(maxPoint.x)))
|
|
{
|
|
half knot_coord = (N_KNOTS_HIGH - 1) * (logx - log10(midPoint.x)) / (log10(maxPoint.x) - log10(midPoint.x));
|
|
int j = knot_coord;
|
|
half t = knot_coord - j;
|
|
|
|
half3 cf = half3(coefsHigh[j], coefsHigh[j + 1], coefsHigh[j + 2]);
|
|
half3 monomials = half3(t * t, t, 1.0);
|
|
logy = dot(monomials, mul(M, cf));
|
|
}
|
|
else
|
|
{ //if (logIn >= log10(maxPoint.x)) {
|
|
logy = logx * slopeHigh + (log10(maxPoint.y) - slopeHigh * log10(maxPoint.x));
|
|
}
|
|
|
|
return pow(10.0, logy);
|
|
}
|
|
|
|
half segmented_spline_c9_fwd(half x)
|
|
{
|
|
const half coefsLow[10] = { -1.6989700043, -1.6989700043, -1.4779000000, -1.2291000000, -0.8648000000, -0.4480000000, 0.0051800000, 0.4511080334, 0.9113744414, 0.9113744414 }; // coefs for B-spline between minPoint and midPoint (units of log luminance)
|
|
const half coefsHigh[10] = { 0.5154386965, 0.8470437783, 1.1358000000, 1.3802000000, 1.5197000000, 1.5985000000, 1.6467000000, 1.6746091357, 1.6878733390, 1.6878733390 }; // coefs for B-spline between midPoint and maxPoint (units of log luminance)
|
|
const half2 minPoint = half2(segmented_spline_c5_fwd(0.18 * exp2(-6.5)), 0.02); // {luminance, luminance} linear extension below this
|
|
const half2 midPoint = half2(segmented_spline_c5_fwd(0.18), 4.8); // {luminance, luminance}
|
|
const half2 maxPoint = half2(segmented_spline_c5_fwd(0.18 * exp2(6.5)), 48.0); // {luminance, luminance} linear extension above this
|
|
const half slopeLow = 0.0; // log-log slope of low linear extension
|
|
const half slopeHigh = 0.04; // log-log slope of high linear extension
|
|
|
|
const int N_KNOTS_LOW = 8;
|
|
const int N_KNOTS_HIGH = 8;
|
|
|
|
// Check for negatives or zero before taking the log. If negative or zero,
|
|
// set to OCESMIN.
|
|
half xCheck = x;
|
|
if (xCheck <= 0.0) xCheck = 1e-4;
|
|
|
|
half logx = log10(xCheck);
|
|
half logy;
|
|
|
|
if (logx <= log10(minPoint.x))
|
|
{
|
|
logy = logx * slopeLow + (log10(minPoint.y) - slopeLow * log10(minPoint.x));
|
|
}
|
|
else if ((logx > log10(minPoint.x)) && (logx < log10(midPoint.x)))
|
|
{
|
|
half knot_coord = (N_KNOTS_LOW - 1) * (logx - log10(minPoint.x)) / (log10(midPoint.x) - log10(minPoint.x));
|
|
int j = knot_coord;
|
|
half t = knot_coord - j;
|
|
|
|
half3 cf = half3(coefsLow[j], coefsLow[j + 1], coefsLow[j + 2]);
|
|
half3 monomials = half3(t * t, t, 1.0);
|
|
logy = dot(monomials, mul(M, cf));
|
|
}
|
|
else if ((logx >= log10(midPoint.x)) && (logx < log10(maxPoint.x)))
|
|
{
|
|
half knot_coord = (N_KNOTS_HIGH - 1) * (logx - log10(midPoint.x)) / (log10(maxPoint.x) - log10(midPoint.x));
|
|
int j = knot_coord;
|
|
half t = knot_coord - j;
|
|
|
|
half3 cf = half3(coefsHigh[j], coefsHigh[j + 1], coefsHigh[j + 2]);
|
|
half3 monomials = half3(t * t, t, 1.0);
|
|
logy = dot(monomials, mul(M, cf));
|
|
}
|
|
else
|
|
{ //if (logIn >= log10(maxPoint.x)) {
|
|
logy = logx * slopeHigh + (log10(maxPoint.y) - slopeHigh * log10(maxPoint.x));
|
|
}
|
|
|
|
return pow(10.0, logy);
|
|
}
|
|
|
|
static const half RRT_GLOW_GAIN = 0.05;
|
|
static const half RRT_GLOW_MID = 0.08;
|
|
|
|
static const half RRT_RED_SCALE = 0.82;
|
|
static const half RRT_RED_PIVOT = 0.03;
|
|
static const half RRT_RED_HUE = 0.0;
|
|
static const half RRT_RED_WIDTH = 135.0;
|
|
|
|
static const half RRT_SAT_FACTOR = 0.96;
|
|
|
|
half3 RRT(half3 aces)
|
|
{
|
|
// --- Glow module --- //
|
|
half saturation = rgb_2_saturation(aces);
|
|
half ycIn = rgb_2_yc(aces);
|
|
half s = sigmoid_shaper((saturation - 0.4) / 0.2);
|
|
half addedGlow = 1.0 + glow_fwd(ycIn, RRT_GLOW_GAIN * s, RRT_GLOW_MID);
|
|
aces *= addedGlow;
|
|
|
|
// --- Red modifier --- //
|
|
half hue = rgb_2_hue(aces);
|
|
half centeredHue = center_hue(hue, RRT_RED_HUE);
|
|
half hueWeight;
|
|
{
|
|
//hueWeight = cubic_basis_shaper(centeredHue, RRT_RED_WIDTH);
|
|
hueWeight = smoothstep(0.0, 1.0, 1.0 - abs(2.0 * centeredHue / RRT_RED_WIDTH));
|
|
hueWeight *= hueWeight;
|
|
}
|
|
|
|
aces.r += hueWeight * saturation * (RRT_RED_PIVOT - aces.r) * (1.0 - RRT_RED_SCALE);
|
|
|
|
// --- ACES to RGB rendering space --- //
|
|
aces = clamp(aces, 0.0, HALF_MAX); // avoids saturated negative colors from becoming positive in the matrix
|
|
half3 rgbPre = mul(AP0_2_AP1_MAT, aces);
|
|
rgbPre = clamp(rgbPre, 0, HALF_MAX);
|
|
|
|
// --- Global desaturation --- //
|
|
//rgbPre = mul(RRT_SAT_MAT, rgbPre);
|
|
rgbPre = lerp(dot(rgbPre, AP1_RGB2Y).xxx, rgbPre, RRT_SAT_FACTOR.xxx);
|
|
|
|
// --- Apply the tonescale independently in rendering-space RGB --- //
|
|
half3 rgbPost;
|
|
rgbPost.x = segmented_spline_c5_fwd(rgbPre.x);
|
|
rgbPost.y = segmented_spline_c5_fwd(rgbPre.y);
|
|
rgbPost.z = segmented_spline_c5_fwd(rgbPre.z);
|
|
|
|
// --- RGB rendering space to OCES --- //
|
|
half3 rgbOces = mul(AP1_2_AP0_MAT, rgbPost);
|
|
|
|
return rgbOces;
|
|
}
|
|
|
|
//
|
|
// Output Device Transform
|
|
//
|
|
half3 Y_2_linCV(half3 Y, half Ymax, half Ymin)
|
|
{
|
|
return (Y - Ymin) / (Ymax - Ymin);
|
|
}
|
|
|
|
half3 XYZ_2_xyY(half3 XYZ)
|
|
{
|
|
half divisor = max(dot(XYZ, (1.0).xxx), 1e-4);
|
|
return half3(XYZ.xy / divisor, XYZ.y);
|
|
}
|
|
|
|
half3 xyY_2_XYZ(half3 xyY)
|
|
{
|
|
half m = xyY.z / max(xyY.y, 1e-4);
|
|
half3 XYZ = half3(xyY.xz, (1.0 - xyY.x - xyY.y));
|
|
XYZ.xz *= m;
|
|
return XYZ;
|
|
}
|
|
|
|
static const half DIM_SURROUND_GAMMA = 0.9811;
|
|
|
|
half3 darkSurround_to_dimSurround(half3 linearCV)
|
|
{
|
|
half3 XYZ = mul(AP1_2_XYZ_MAT, linearCV);
|
|
|
|
half3 xyY = XYZ_2_xyY(XYZ);
|
|
xyY.z = clamp(xyY.z, 0.0, HALF_MAX);
|
|
xyY.z = pow(xyY.z, DIM_SURROUND_GAMMA);
|
|
XYZ = xyY_2_XYZ(xyY);
|
|
|
|
return mul(XYZ_2_AP1_MAT, XYZ);
|
|
}
|
|
|
|
half moncurve_r(half y, half gamma, half offs)
|
|
{
|
|
// Reverse monitor curve
|
|
half x;
|
|
const half yb = pow(offs * gamma / ((gamma - 1.0) * (1.0 + offs)), gamma);
|
|
const half rs = pow((gamma - 1.0) / offs, gamma - 1.0) * pow((1.0 + offs) / gamma, gamma);
|
|
if (y >= yb)
|
|
x = (1.0 + offs) * pow(y, 1.0 / gamma) - offs;
|
|
else
|
|
x = y * rs;
|
|
return x;
|
|
}
|
|
|
|
half bt1886_r(half L, half gamma, half Lw, half Lb)
|
|
{
|
|
// The reference EOTF specified in Rec. ITU-R BT.1886
|
|
// L = a(max[(V+b),0])^g
|
|
half a = pow(pow(Lw, 1.0 / gamma) - pow(Lb, 1.0 / gamma), gamma);
|
|
half b = pow(Lb, 1.0 / gamma) / (pow(Lw, 1.0 / gamma) - pow(Lb, 1.0 / gamma));
|
|
half V = pow(max(L / a, 0.0), 1.0 / gamma) - b;
|
|
return V;
|
|
}
|
|
|
|
half roll_white_fwd(
|
|
half x, // color value to adjust (white scaled to around 1.0)
|
|
half new_wht, // white adjustment (e.g. 0.9 for 10% darkening)
|
|
half width // adjusted width (e.g. 0.25 for top quarter of the tone scale)
|
|
)
|
|
{
|
|
const half x0 = -1.0;
|
|
const half x1 = x0 + width;
|
|
const half y0 = -new_wht;
|
|
const half y1 = x1;
|
|
const half m1 = (x1 - x0);
|
|
const half a = y0 - y1 + m1;
|
|
const half b = 2.0 * (y1 - y0) - m1;
|
|
const half c = y0;
|
|
const half t = (-x - x0) / (x1 - x0);
|
|
half o = 0.0;
|
|
if (t < 0.0)
|
|
o = -(t * b + c);
|
|
else if (t > 1.0)
|
|
o = x;
|
|
else
|
|
o = -((t * a + b) * t + c);
|
|
return o;
|
|
}
|
|
|
|
half3 linear_to_sRGB(half3 x)
|
|
{
|
|
return (x <= 0.0031308 ? (x * 12.9232102) : 1.055 * pow(x, 1.0 / 2.4) - 0.055);
|
|
}
|
|
|
|
half3 linear_to_bt1886(half3 x, half gamma, half Lw, half Lb)
|
|
{
|
|
// Good enough approximation for now, may consider using the exact formula instead
|
|
// TODO: Experiment
|
|
return pow(max(x, 0.0), 1.0 / 2.4);
|
|
|
|
// Correct implementation (Reference EOTF specified in Rec. ITU-R BT.1886) :
|
|
// L = a(max[(V+b),0])^g
|
|
half invgamma = 1.0 / gamma;
|
|
half p_Lw = pow(Lw, invgamma);
|
|
half p_Lb = pow(Lb, invgamma);
|
|
half3 a = pow(p_Lw - p_Lb, gamma).xxx;
|
|
half3 b = (p_Lb / p_Lw - p_Lb).xxx;
|
|
half3 V = pow(max(x / a, 0.0), invgamma.xxx) - b;
|
|
return V;
|
|
}
|
|
|
|
static const half CINEMA_WHITE = 48.0;
|
|
static const half CINEMA_BLACK = CINEMA_WHITE / 2400.0;
|
|
static const half ODT_SAT_FACTOR = 0.93;
|
|
|
|
// <ACEStransformID>ODT.Academy.RGBmonitor_100nits_dim.a1.0.3</ACEStransformID>
|
|
// <ACESuserName>ACES 1.0 Output - sRGB</ACESuserName>
|
|
|
|
//
|
|
// Output Device Transform - RGB computer monitor
|
|
//
|
|
|
|
//
|
|
// Summary :
|
|
// This transform is intended for mapping OCES onto a desktop computer monitor
|
|
// typical of those used in motion picture visual effects production. These
|
|
// monitors may occasionally be referred to as "sRGB" displays, however, the
|
|
// monitor for which this transform is designed does not exactly match the
|
|
// specifications in IEC 61966-2-1:1999.
|
|
//
|
|
// The assumed observer adapted white is D65, and the viewing environment is
|
|
// that of a dim surround.
|
|
//
|
|
// The monitor specified is intended to be more typical of those found in
|
|
// visual effects production.
|
|
//
|
|
// Device Primaries :
|
|
// Primaries are those specified in Rec. ITU-R BT.709
|
|
// CIE 1931 chromaticities: x y Y
|
|
// Red: 0.64 0.33
|
|
// Green: 0.3 0.6
|
|
// Blue: 0.15 0.06
|
|
// White: 0.3127 0.329 100 cd/m^2
|
|
//
|
|
// Display EOTF :
|
|
// The reference electro-optical transfer function specified in
|
|
// IEC 61966-2-1:1999.
|
|
//
|
|
// Signal Range:
|
|
// This transform outputs full range code values.
|
|
//
|
|
// Assumed observer adapted white point:
|
|
// CIE 1931 chromaticities: x y
|
|
// 0.3127 0.329
|
|
//
|
|
// Viewing Environment:
|
|
// This ODT has a compensation for viewing environment variables more typical
|
|
// of those associated with video mastering.
|
|
//
|
|
half3 ODT_RGBmonitor_100nits_dim(half3 oces)
|
|
{
|
|
// OCES to RGB rendering space
|
|
half3 rgbPre = mul(AP0_2_AP1_MAT, oces);
|
|
|
|
// Apply the tonescale independently in rendering-space RGB
|
|
half3 rgbPost;
|
|
rgbPost.x = segmented_spline_c9_fwd(rgbPre.x);
|
|
rgbPost.y = segmented_spline_c9_fwd(rgbPre.y);
|
|
rgbPost.z = segmented_spline_c9_fwd(rgbPre.z);
|
|
|
|
// Scale luminance to linear code value
|
|
half3 linearCV = Y_2_linCV(rgbPost, CINEMA_WHITE, CINEMA_BLACK);
|
|
|
|
// Apply gamma adjustment to compensate for dim surround
|
|
linearCV = darkSurround_to_dimSurround(linearCV);
|
|
|
|
// Apply desaturation to compensate for luminance difference
|
|
//linearCV = mul(ODT_SAT_MAT, linearCV);
|
|
linearCV = lerp(dot(linearCV, AP1_RGB2Y).xxx, linearCV, ODT_SAT_FACTOR.xxx);
|
|
|
|
// Convert to display primary encoding
|
|
// Rendering space RGB to XYZ
|
|
half3 XYZ = mul(AP1_2_XYZ_MAT, linearCV);
|
|
|
|
// Apply CAT from ACES white point to assumed observer adapted white point
|
|
XYZ = mul(D60_2_D65_CAT, XYZ);
|
|
|
|
// CIE XYZ to display primaries
|
|
linearCV = mul(XYZ_2_REC709_MAT, XYZ);
|
|
|
|
// Handle out-of-gamut values
|
|
// Clip values < 0 or > 1 (i.e. projecting outside the display primaries)
|
|
linearCV = saturate(linearCV);
|
|
|
|
// TODO: Revisit when it is possible to deactivate Unity default framebuffer encoding
|
|
// with sRGB opto-electrical transfer function (OETF).
|
|
/*
|
|
// Encode linear code values with transfer function
|
|
half3 outputCV;
|
|
// moncurve_r with gamma of 2.4 and offset of 0.055 matches the EOTF found in IEC 61966-2-1:1999 (sRGB)
|
|
const half DISPGAMMA = 2.4;
|
|
const half OFFSET = 0.055;
|
|
outputCV.x = moncurve_r(linearCV.x, DISPGAMMA, OFFSET);
|
|
outputCV.y = moncurve_r(linearCV.y, DISPGAMMA, OFFSET);
|
|
outputCV.z = moncurve_r(linearCV.z, DISPGAMMA, OFFSET);
|
|
|
|
outputCV = linear_to_sRGB(linearCV);
|
|
*/
|
|
|
|
// Unity already draws to a sRGB target
|
|
return linearCV;
|
|
}
|
|
|
|
// <ACEStransformID>ODT.Academy.RGBmonitor_D60sim_100nits_dim.a1.0.3</ACEStransformID>
|
|
// <ACESuserName>ACES 1.0 Output - sRGB (D60 sim.)</ACESuserName>
|
|
|
|
//
|
|
// Output Device Transform - RGB computer monitor (D60 simulation)
|
|
//
|
|
|
|
//
|
|
// Summary :
|
|
// This transform is intended for mapping OCES onto a desktop computer monitor
|
|
// typical of those used in motion picture visual effects production. These
|
|
// monitors may occasionally be referred to as "sRGB" displays, however, the
|
|
// monitor for which this transform is designed does not exactly match the
|
|
// specifications in IEC 61966-2-1:1999.
|
|
//
|
|
// The assumed observer adapted white is D60, and the viewing environment is
|
|
// that of a dim surround.
|
|
//
|
|
// The monitor specified is intended to be more typical of those found in
|
|
// visual effects production.
|
|
//
|
|
// Device Primaries :
|
|
// Primaries are those specified in Rec. ITU-R BT.709
|
|
// CIE 1931 chromaticities: x y Y
|
|
// Red: 0.64 0.33
|
|
// Green: 0.3 0.6
|
|
// Blue: 0.15 0.06
|
|
// White: 0.3127 0.329 100 cd/m^2
|
|
//
|
|
// Display EOTF :
|
|
// The reference electro-optical transfer function specified in
|
|
// IEC 61966-2-1:1999.
|
|
//
|
|
// Signal Range:
|
|
// This transform outputs full range code values.
|
|
//
|
|
// Assumed observer adapted white point:
|
|
// CIE 1931 chromaticities: x y
|
|
// 0.32168 0.33767
|
|
//
|
|
// Viewing Environment:
|
|
// This ODT has a compensation for viewing environment variables more typical
|
|
// of those associated with video mastering.
|
|
//
|
|
half3 ODT_RGBmonitor_D60sim_100nits_dim(half3 oces)
|
|
{
|
|
// OCES to RGB rendering space
|
|
half3 rgbPre = mul(AP0_2_AP1_MAT, oces);
|
|
|
|
// Apply the tonescale independently in rendering-space RGB
|
|
half3 rgbPost;
|
|
rgbPost.x = segmented_spline_c9_fwd(rgbPre.x);
|
|
rgbPost.y = segmented_spline_c9_fwd(rgbPre.y);
|
|
rgbPost.z = segmented_spline_c9_fwd(rgbPre.z);
|
|
|
|
// Scale luminance to linear code value
|
|
half3 linearCV = Y_2_linCV(rgbPost, CINEMA_WHITE, CINEMA_BLACK);
|
|
|
|
// --- Compensate for different white point being darker --- //
|
|
// This adjustment is to correct an issue that exists in ODTs where the device
|
|
// is calibrated to a white chromaticity other than D60. In order to simulate
|
|
// D60 on such devices, unequal code values are sent to the display to achieve
|
|
// neutrals at D60. In order to produce D60 on a device calibrated to the DCI
|
|
// white point (i.e. equal code values yield CIE x,y chromaticities of 0.314,
|
|
// 0.351) the red channel is higher than green and blue to compensate for the
|
|
// "greenish" DCI white. This is the correct behavior but it means that as
|
|
// highlight increase, the red channel will hit the device maximum first and
|
|
// clip, resulting in a chromaticity shift as the green and blue channels
|
|
// continue to increase.
|
|
// To avoid this clipping error, a slight scale factor is applied to allow the
|
|
// ODTs to simulate D60 within the D65 calibration white point.
|
|
|
|
// Scale and clamp white to avoid casted highlights due to D60 simulation
|
|
const half SCALE = 0.955;
|
|
linearCV = min(linearCV, 1.0) * SCALE;
|
|
|
|
// Apply gamma adjustment to compensate for dim surround
|
|
linearCV = darkSurround_to_dimSurround(linearCV);
|
|
|
|
// Apply desaturation to compensate for luminance difference
|
|
//linearCV = mul(ODT_SAT_MAT, linearCV);
|
|
linearCV = lerp(dot(linearCV, AP1_RGB2Y).xxx, linearCV, ODT_SAT_FACTOR.xxx);
|
|
|
|
// Convert to display primary encoding
|
|
// Rendering space RGB to XYZ
|
|
half3 XYZ = mul(AP1_2_XYZ_MAT, linearCV);
|
|
|
|
// CIE XYZ to display primaries
|
|
linearCV = mul(XYZ_2_REC709_MAT, XYZ);
|
|
|
|
// Handle out-of-gamut values
|
|
// Clip values < 0 or > 1 (i.e. projecting outside the display primaries)
|
|
linearCV = saturate(linearCV);
|
|
|
|
// TODO: Revisit when it is possible to deactivate Unity default framebuffer encoding
|
|
// with sRGB opto-electrical transfer function (OETF).
|
|
/*
|
|
// Encode linear code values with transfer function
|
|
half3 outputCV;
|
|
// moncurve_r with gamma of 2.4 and offset of 0.055 matches the EOTF found in IEC 61966-2-1:1999 (sRGB)
|
|
const half DISPGAMMA = 2.4;
|
|
const half OFFSET = 0.055;
|
|
outputCV.x = moncurve_r(linearCV.x, DISPGAMMA, OFFSET);
|
|
outputCV.y = moncurve_r(linearCV.y, DISPGAMMA, OFFSET);
|
|
outputCV.z = moncurve_r(linearCV.z, DISPGAMMA, OFFSET);
|
|
|
|
outputCV = linear_to_sRGB(linearCV);
|
|
*/
|
|
|
|
// Unity already draws to a sRGB target
|
|
return linearCV;
|
|
}
|
|
|
|
// <ACEStransformID>ODT.Academy.Rec709_100nits_dim.a1.0.3</ACEStransformID>
|
|
// <ACESuserName>ACES 1.0 Output - Rec.709</ACESuserName>
|
|
|
|
//
|
|
// Output Device Transform - Rec709
|
|
//
|
|
|
|
//
|
|
// Summary :
|
|
// This transform is intended for mapping OCES onto a Rec.709 broadcast monitor
|
|
// that is calibrated to a D65 white point at 100 cd/m^2. The assumed observer
|
|
// adapted white is D65, and the viewing environment is a dim surround.
|
|
//
|
|
// A possible use case for this transform would be HDTV/video mastering.
|
|
//
|
|
// Device Primaries :
|
|
// Primaries are those specified in Rec. ITU-R BT.709
|
|
// CIE 1931 chromaticities: x y Y
|
|
// Red: 0.64 0.33
|
|
// Green: 0.3 0.6
|
|
// Blue: 0.15 0.06
|
|
// White: 0.3127 0.329 100 cd/m^2
|
|
//
|
|
// Display EOTF :
|
|
// The reference electro-optical transfer function specified in
|
|
// Rec. ITU-R BT.1886.
|
|
//
|
|
// Signal Range:
|
|
// By default, this transform outputs full range code values. If instead a
|
|
// SMPTE "legal" signal is desired, there is a runtime flag to output
|
|
// SMPTE legal signal. In ctlrender, this can be achieved by appending
|
|
// '-param1 legalRange 1' after the '-ctl odt.ctl' string.
|
|
//
|
|
// Assumed observer adapted white point:
|
|
// CIE 1931 chromaticities: x y
|
|
// 0.3127 0.329
|
|
//
|
|
// Viewing Environment:
|
|
// This ODT has a compensation for viewing environment variables more typical
|
|
// of those associated with video mastering.
|
|
//
|
|
half3 ODT_Rec709_100nits_dim(half3 oces)
|
|
{
|
|
// OCES to RGB rendering space
|
|
half3 rgbPre = mul(AP0_2_AP1_MAT, oces);
|
|
|
|
// Apply the tonescale independently in rendering-space RGB
|
|
half3 rgbPost;
|
|
rgbPost.x = segmented_spline_c9_fwd(rgbPre.x);
|
|
rgbPost.y = segmented_spline_c9_fwd(rgbPre.y);
|
|
rgbPost.z = segmented_spline_c9_fwd(rgbPre.z);
|
|
|
|
// Scale luminance to linear code value
|
|
half3 linearCV = Y_2_linCV(rgbPost, CINEMA_WHITE, CINEMA_BLACK);
|
|
|
|
// Apply gamma adjustment to compensate for dim surround
|
|
linearCV = darkSurround_to_dimSurround(linearCV);
|
|
|
|
// Apply desaturation to compensate for luminance difference
|
|
//linearCV = mul(ODT_SAT_MAT, linearCV);
|
|
linearCV = lerp(dot(linearCV, AP1_RGB2Y).xxx, linearCV, ODT_SAT_FACTOR.xxx);
|
|
|
|
// Convert to display primary encoding
|
|
// Rendering space RGB to XYZ
|
|
half3 XYZ = mul(AP1_2_XYZ_MAT, linearCV);
|
|
|
|
// Apply CAT from ACES white point to assumed observer adapted white point
|
|
XYZ = mul(D60_2_D65_CAT, XYZ);
|
|
|
|
// CIE XYZ to display primaries
|
|
linearCV = mul(XYZ_2_REC709_MAT, XYZ);
|
|
|
|
// Handle out-of-gamut values
|
|
// Clip values < 0 or > 1 (i.e. projecting outside the display primaries)
|
|
linearCV = saturate(linearCV);
|
|
|
|
// Encode linear code values with transfer function
|
|
const half DISPGAMMA = 2.4;
|
|
const half L_W = 1.0;
|
|
const half L_B = 0.0;
|
|
half3 outputCV = linear_to_bt1886(linearCV, DISPGAMMA, L_W, L_B);
|
|
|
|
// TODO: Implement support for legal range.
|
|
|
|
// NOTE: Unity framebuffer encoding is encoded with sRGB opto-electrical transfer function (OETF)
|
|
// by default which will result in double perceptual encoding, thus for now if one want to use
|
|
// this ODT, he needs to decode its output with sRGB electro-optical transfer function (EOTF) to
|
|
// compensate for Unity default behaviour.
|
|
|
|
return outputCV;
|
|
}
|
|
|
|
// <ACEStransformID>ODT.Academy.Rec709_D60sim_100nits_dim.a1.0.3</ACEStransformID>
|
|
// <ACESuserName>ACES 1.0 Output - Rec.709 (D60 sim.)</ACESuserName>
|
|
|
|
//
|
|
// Output Device Transform - Rec709 (D60 simulation)
|
|
//
|
|
|
|
//
|
|
// Summary :
|
|
// This transform is intended for mapping OCES onto a Rec.709 broadcast monitor
|
|
// that is calibrated to a D65 white point at 100 cd/m^2. The assumed observer
|
|
// adapted white is D60, and the viewing environment is a dim surround.
|
|
//
|
|
// A possible use case for this transform would be cinema "soft-proofing".
|
|
//
|
|
// Device Primaries :
|
|
// Primaries are those specified in Rec. ITU-R BT.709
|
|
// CIE 1931 chromaticities: x y Y
|
|
// Red: 0.64 0.33
|
|
// Green: 0.3 0.6
|
|
// Blue: 0.15 0.06
|
|
// White: 0.3127 0.329 100 cd/m^2
|
|
//
|
|
// Display EOTF :
|
|
// The reference electro-optical transfer function specified in
|
|
// Rec. ITU-R BT.1886.
|
|
//
|
|
// Signal Range:
|
|
// By default, this transform outputs full range code values. If instead a
|
|
// SMPTE "legal" signal is desired, there is a runtime flag to output
|
|
// SMPTE legal signal. In ctlrender, this can be achieved by appending
|
|
// '-param1 legalRange 1' after the '-ctl odt.ctl' string.
|
|
//
|
|
// Assumed observer adapted white point:
|
|
// CIE 1931 chromaticities: x y
|
|
// 0.32168 0.33767
|
|
//
|
|
// Viewing Environment:
|
|
// This ODT has a compensation for viewing environment variables more typical
|
|
// of those associated with video mastering.
|
|
//
|
|
half3 ODT_Rec709_D60sim_100nits_dim(half3 oces)
|
|
{
|
|
// OCES to RGB rendering space
|
|
half3 rgbPre = mul(AP0_2_AP1_MAT, oces);
|
|
|
|
// Apply the tonescale independently in rendering-space RGB
|
|
half3 rgbPost;
|
|
rgbPost.x = segmented_spline_c9_fwd(rgbPre.x);
|
|
rgbPost.y = segmented_spline_c9_fwd(rgbPre.y);
|
|
rgbPost.z = segmented_spline_c9_fwd(rgbPre.z);
|
|
|
|
// Scale luminance to linear code value
|
|
half3 linearCV = Y_2_linCV(rgbPost, CINEMA_WHITE, CINEMA_BLACK);
|
|
|
|
// --- Compensate for different white point being darker --- //
|
|
// This adjustment is to correct an issue that exists in ODTs where the device
|
|
// is calibrated to a white chromaticity other than D60. In order to simulate
|
|
// D60 on such devices, unequal code values must be sent to the display to achieve
|
|
// the chromaticities of D60. More specifically, in order to produce D60 on a device
|
|
// calibrated to a D65 white point (i.e. equal code values yield CIE x,y
|
|
// chromaticities of 0.3127, 0.329) the red channel must be slightly higher than
|
|
// that of green and blue in order to compensate for the relatively more "blue-ish"
|
|
// D65 white. This unequalness of color channels is the correct behavior but it
|
|
// means that as neutral highlights increase, the red channel will hit the
|
|
// device maximum first and clip, resulting in a small chromaticity shift as the
|
|
// green and blue channels continue to increase to their maximums.
|
|
// To avoid this clipping error, a slight scale factor is applied to allow the
|
|
// ODTs to simulate D60 within the D65 calibration white point.
|
|
|
|
// Scale and clamp white to avoid casted highlights due to D60 simulation
|
|
const half SCALE = 0.955;
|
|
linearCV = min(linearCV, 1.0) * SCALE;
|
|
|
|
// Apply gamma adjustment to compensate for dim surround
|
|
linearCV = darkSurround_to_dimSurround(linearCV);
|
|
|
|
// Apply desaturation to compensate for luminance difference
|
|
//linearCV = mul(ODT_SAT_MAT, linearCV);
|
|
linearCV = lerp(dot(linearCV, AP1_RGB2Y).xxx, linearCV, ODT_SAT_FACTOR.xxx);
|
|
|
|
// Convert to display primary encoding
|
|
// Rendering space RGB to XYZ
|
|
half3 XYZ = mul(AP1_2_XYZ_MAT, linearCV);
|
|
|
|
// CIE XYZ to display primaries
|
|
linearCV = mul(XYZ_2_REC709_MAT, XYZ);
|
|
|
|
// Handle out-of-gamut values
|
|
// Clip values < 0 or > 1 (i.e. projecting outside the display primaries)
|
|
linearCV = saturate(linearCV);
|
|
|
|
// Encode linear code values with transfer function
|
|
const half DISPGAMMA = 2.4;
|
|
const half L_W = 1.0;
|
|
const half L_B = 0.0;
|
|
half3 outputCV = linear_to_bt1886(linearCV, DISPGAMMA, L_W, L_B);
|
|
|
|
// TODO: Implement support for legal range.
|
|
|
|
// NOTE: Unity framebuffer encoding is encoded with sRGB opto-electrical transfer function (OETF)
|
|
// by default which will result in double perceptual encoding, thus for now if one want to use
|
|
// this ODT, he needs to decode its output with sRGB electro-optical transfer function (EOTF) to
|
|
// compensate for Unity default behaviour.
|
|
|
|
return outputCV;
|
|
}
|
|
|
|
// <ACEStransformID>ODT.Academy.Rec2020_100nits_dim.a1.0.3</ACEStransformID>
|
|
// <ACESuserName>ACES 1.0 Output - Rec.2020</ACESuserName>
|
|
|
|
//
|
|
// Output Device Transform - Rec2020
|
|
//
|
|
|
|
//
|
|
// Summary :
|
|
// This transform is intended for mapping OCES onto a Rec.2020 broadcast
|
|
// monitor that is calibrated to a D65 white point at 100 cd/m^2. The assumed
|
|
// observer adapted white is D65, and the viewing environment is that of a dim
|
|
// surround.
|
|
//
|
|
// A possible use case for this transform would be UHDTV/video mastering.
|
|
//
|
|
// Device Primaries :
|
|
// Primaries are those specified in Rec. ITU-R BT.2020
|
|
// CIE 1931 chromaticities: x y Y
|
|
// Red: 0.708 0.292
|
|
// Green: 0.17 0.797
|
|
// Blue: 0.131 0.046
|
|
// White: 0.3127 0.329 100 cd/m^2
|
|
//
|
|
// Display EOTF :
|
|
// The reference electro-optical transfer function specified in
|
|
// Rec. ITU-R BT.1886.
|
|
//
|
|
// Signal Range:
|
|
// By default, this transform outputs full range code values. If instead a
|
|
// SMPTE "legal" signal is desired, there is a runtime flag to output
|
|
// SMPTE legal signal. In ctlrender, this can be achieved by appending
|
|
// '-param1 legalRange 1' after the '-ctl odt.ctl' string.
|
|
//
|
|
// Assumed observer adapted white point:
|
|
// CIE 1931 chromaticities: x y
|
|
// 0.3127 0.329
|
|
//
|
|
// Viewing Environment:
|
|
// This ODT has a compensation for viewing environment variables more typical
|
|
// of those associated with video mastering.
|
|
//
|
|
|
|
half3 ODT_Rec2020_100nits_dim(half3 oces)
|
|
{
|
|
// OCES to RGB rendering space
|
|
half3 rgbPre = mul(AP0_2_AP1_MAT, oces);
|
|
|
|
// Apply the tonescale independently in rendering-space RGB
|
|
half3 rgbPost;
|
|
rgbPost.x = segmented_spline_c9_fwd(rgbPre.x);
|
|
rgbPost.y = segmented_spline_c9_fwd(rgbPre.y);
|
|
rgbPost.z = segmented_spline_c9_fwd(rgbPre.z);
|
|
|
|
// Scale luminance to linear code value
|
|
half3 linearCV = Y_2_linCV(rgbPost, CINEMA_WHITE, CINEMA_BLACK);
|
|
|
|
// Apply gamma adjustment to compensate for dim surround
|
|
linearCV = darkSurround_to_dimSurround(linearCV);
|
|
|
|
// Apply desaturation to compensate for luminance difference
|
|
//linearCV = mul(ODT_SAT_MAT, linearCV);
|
|
linearCV = lerp(dot(linearCV, AP1_RGB2Y).xxx, linearCV, ODT_SAT_FACTOR.xxx);
|
|
|
|
// Convert to display primary encoding
|
|
// Rendering space RGB to XYZ
|
|
half3 XYZ = mul(AP1_2_XYZ_MAT, linearCV);
|
|
|
|
// Apply CAT from ACES white point to assumed observer adapted white point
|
|
XYZ = mul(D60_2_D65_CAT, XYZ);
|
|
|
|
// CIE XYZ to display primaries
|
|
linearCV = mul(XYZ_2_REC2020_MAT, XYZ);
|
|
|
|
// Handle out-of-gamut values
|
|
// Clip values < 0 or > 1 (i.e. projecting outside the display primaries)
|
|
linearCV = saturate(linearCV);
|
|
|
|
// Encode linear code values with transfer function
|
|
const half DISPGAMMA = 2.4;
|
|
const half L_W = 1.0;
|
|
const half L_B = 0.0;
|
|
half3 outputCV = linear_to_bt1886(linearCV, DISPGAMMA, L_W, L_B);
|
|
|
|
// TODO: Implement support for legal range.
|
|
|
|
// NOTE: Unity framebuffer encoding is encoded with sRGB opto-electrical transfer function (OETF)
|
|
// by default which will result in double perceptual encoding, thus for now if one want to use
|
|
// this ODT, he needs to decode its output with sRGB electro-optical transfer function (EOTF) to
|
|
// compensate for Unity default behaviour.
|
|
|
|
return outputCV;
|
|
}
|
|
|
|
// <ACEStransformID>ODT.Academy.P3DCI_48nits.a1.0.3</ACEStransformID>
|
|
// <ACESuserName>ACES 1.0 Output - P3-DCI</ACESuserName>
|
|
|
|
//
|
|
// Output Device Transform - P3DCI (D60 Simulation)
|
|
//
|
|
|
|
//
|
|
// Summary :
|
|
// This transform is intended for mapping OCES onto a P3 digital cinema
|
|
// projector that is calibrated to a DCI white point at 48 cd/m^2. The assumed
|
|
// observer adapted white is D60, and the viewing environment is that of a dark
|
|
// theater.
|
|
//
|
|
// Device Primaries :
|
|
// CIE 1931 chromaticities: x y Y
|
|
// Red: 0.68 0.32
|
|
// Green: 0.265 0.69
|
|
// Blue: 0.15 0.06
|
|
// White: 0.314 0.351 48 cd/m^2
|
|
//
|
|
// Display EOTF :
|
|
// Gamma: 2.6
|
|
//
|
|
// Assumed observer adapted white point:
|
|
// CIE 1931 chromaticities: x y
|
|
// 0.32168 0.33767
|
|
//
|
|
// Viewing Environment:
|
|
// Environment specified in SMPTE RP 431-2-2007
|
|
//
|
|
half3 ODT_P3DCI_48nits(half3 oces)
|
|
{
|
|
// OCES to RGB rendering space
|
|
half3 rgbPre = mul(AP0_2_AP1_MAT, oces);
|
|
|
|
// Apply the tonescale independently in rendering-space RGB
|
|
half3 rgbPost;
|
|
rgbPost.x = segmented_spline_c9_fwd(rgbPre.x);
|
|
rgbPost.y = segmented_spline_c9_fwd(rgbPre.y);
|
|
rgbPost.z = segmented_spline_c9_fwd(rgbPre.z);
|
|
|
|
// Scale luminance to linear code value
|
|
half3 linearCV = Y_2_linCV(rgbPost, CINEMA_WHITE, CINEMA_BLACK);
|
|
|
|
// --- Compensate for different white point being darker --- //
|
|
// This adjustment is to correct an issue that exists in ODTs where the device
|
|
// is calibrated to a white chromaticity other than D60. In order to simulate
|
|
// D60 on such devices, unequal code values are sent to the display to achieve
|
|
// neutrals at D60. In order to produce D60 on a device calibrated to the DCI
|
|
// white point (i.e. equal code values yield CIE x,y chromaticities of 0.314,
|
|
// 0.351) the red channel is higher than green and blue to compensate for the
|
|
// "greenish" DCI white. This is the correct behavior but it means that as
|
|
// highlight increase, the red channel will hit the device maximum first and
|
|
// clip, resulting in a chromaticity shift as the green and blue channels
|
|
// continue to increase.
|
|
// To avoid this clipping error, a slight scale factor is applied to allow the
|
|
// ODTs to simulate D60 within the D65 calibration white point. However, the
|
|
// magnitude of the scale factor required for the P3DCI ODT was considered too
|
|
// large. Therefore, the scale factor was reduced and the additional required
|
|
// compression was achieved via a reshaping of the highlight rolloff in
|
|
// conjunction with the scale. The shape of this rolloff was determined
|
|
// throught subjective experiments and deemed to best reproduce the
|
|
// "character" of the highlights in the P3D60 ODT.
|
|
|
|
// Roll off highlights to avoid need for as much scaling
|
|
const half NEW_WHT = 0.918;
|
|
const half ROLL_WIDTH = 0.5;
|
|
linearCV.x = roll_white_fwd(linearCV.x, NEW_WHT, ROLL_WIDTH);
|
|
linearCV.y = roll_white_fwd(linearCV.y, NEW_WHT, ROLL_WIDTH);
|
|
linearCV.z = roll_white_fwd(linearCV.z, NEW_WHT, ROLL_WIDTH);
|
|
|
|
// Scale and clamp white to avoid casted highlights due to D60 simulation
|
|
const half SCALE = 0.96;
|
|
linearCV = min(linearCV, NEW_WHT) * SCALE;
|
|
|
|
// Convert to display primary encoding
|
|
// Rendering space RGB to XYZ
|
|
half3 XYZ = mul(AP1_2_XYZ_MAT, linearCV);
|
|
|
|
// CIE XYZ to display primaries
|
|
linearCV = mul(XYZ_2_DCIP3_MAT, XYZ);
|
|
|
|
// Handle out-of-gamut values
|
|
// Clip values < 0 or > 1 (i.e. projecting outside the display primaries)
|
|
linearCV = saturate(linearCV);
|
|
|
|
// Encode linear code values with transfer function
|
|
const half DISPGAMMA = 2.6;
|
|
half3 outputCV = pow(linearCV, 1.0 / DISPGAMMA);
|
|
|
|
// NOTE: Unity framebuffer encoding is encoded with sRGB opto-electrical transfer function (OETF)
|
|
// by default which will result in double perceptual encoding, thus for now if one want to use
|
|
// this ODT, he needs to decode its output with sRGB electro-optical transfer function (EOTF) to
|
|
// compensate for Unity default behaviour.
|
|
|
|
return outputCV;
|
|
}
|
|
|
|
#endif // __ACES__
|