96 lines
3.0 KiB
HLSL
96 lines
3.0 KiB
HLSL
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// This file (BeautifyAGX.hlsl) is covered by MIT license as follows:
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//
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// MIT License
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//
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// Copyright (c) 2024 Missing Deadlines (Benjamin Wrensch)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright and this permission shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// All values used to derive this implementation are sourced from Troy’s initial AgX implementation/OCIO config file available here:
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// https://github.com/sobotka/AgX
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// Adaptation to HLSL for Unity by Kronnect
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#ifndef BEAUTIFY_AGX
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#define BEAUTIFY_AGX
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float _TonemapAGXGamma;
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static const float3x3 agx_mat = float3x3(
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0.842479062253094, 0.0784335999999992, 0.0792237451477643,
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0.0423282422610123, 0.878468636469772, 0.0791661274605434,
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0.0423756549057051, 0.0784336, 0.879142973793104);
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static const float3x3 agx_mat_inv = float3x3(
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1.19687900512017, -0.0980208811401368, -0.0990297440797205,
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-0.0528968517574562, 1.15190312990417, -0.0989611768448433,
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-0.0529716355144438, -0.0980434501171241, 1.15107367264116);
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// Mean error^2: 3.6705141e-06
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float3 agxDefaultContrastApprox(float3 x) {
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float3 x2 = x * x;
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float3 x4 = x2 * x2;
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return 15.5 * x4 * x2
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- 40.14 * x4 * x
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+ 31.96 * x4
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- 6.868 * x2 * x
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+ 0.4298 * x2
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+ 0.1191 * x
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- 0.00232;
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}
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float3 agx(float3 val) {
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const float min_ev = -12.47393f;
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const float max_ev = 4.026069f;
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// Input transform (inset)
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val = mul(agx_mat, val);
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// Log2 space encoding
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val = clamp(log2(val), min_ev, max_ev);
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val = (val - min_ev) / (max_ev - min_ev);
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// Apply sigmoid function approximation
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val = agxDefaultContrastApprox(val);
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return val;
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}
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float3 agxEotf(float3 val) {
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// Inverse input transform (outset)
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val = mul(agx_mat_inv, val);
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// sRGB IEC 61966-2-1 2.2 Exponent Reference EOTF Display
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// NOTE: We're linearizing the output here. Comment/adjust when
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// *not* using a sRGB render target
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val = pow(val, _TonemapAGXGamma);
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return val;
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}
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float3 AGXFitted(float3 value) {
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value = agx(value);
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value = agxEotf(value);
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return value;
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}
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#endif
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