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// This file is part of the FidelityFX SDK.
//
// Copyright (C) 2024 Advanced Micro Devices, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files(the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and /or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions :
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
struct LumaInstabilityFactorData
{
FfxFloat32x4 fLumaHistory;
FfxFloat32 fLumaInstabilityFactor;
};
LumaInstabilityFactorData ComputeLumaInstabilityFactor(LumaInstabilityFactorData data, FfxFloat32 fCurrentFrameLuma, FfxFloat32 fFarthestDepthInMeters)
{
const FfxInt32 N_MINUS_1 = 0;
const FfxInt32 N_MINUS_2 = 1;
const FfxInt32 N_MINUS_3 = 2;
const FfxInt32 N_MINUS_4 = 3;
FfxFloat32 fLumaInstability = 0.0f;
const FfxFloat32 fDiffs0 = (fCurrentFrameLuma - data.fLumaHistory[N_MINUS_1]);
const FfxFloat32 fSimilarity0 = MinDividedByMax(fCurrentFrameLuma, data.fLumaHistory[N_MINUS_1], 1.0f);
FfxFloat32 fMaxSimilarity = fSimilarity0;
if (fSimilarity0 < 1.0f) {
for (int i = N_MINUS_2; i <= N_MINUS_4; i++) {
const FfxFloat32 fDiffs1 = (fCurrentFrameLuma - data.fLumaHistory[i]);
const FfxFloat32 fSimilarity1 = MinDividedByMax(fCurrentFrameLuma, data.fLumaHistory[i]);
if (sign(fDiffs0) == sign(fDiffs1)) {
fMaxSimilarity = ffxMax(fMaxSimilarity, fSimilarity1);
}
}
fLumaInstability = FfxFloat32(fMaxSimilarity > fSimilarity0);
}
// Shift history
data.fLumaHistory[N_MINUS_4] = data.fLumaHistory[N_MINUS_3];
data.fLumaHistory[N_MINUS_3] = data.fLumaHistory[N_MINUS_2];
data.fLumaHistory[N_MINUS_2] = data.fLumaHistory[N_MINUS_1];
data.fLumaHistory[N_MINUS_1] = fCurrentFrameLuma;
data.fLumaHistory /= Exposure();
data.fLumaInstabilityFactor = fLumaInstability * FfxFloat32(data.fLumaHistory[N_MINUS_4] != 0);
return data;
}
void LumaInstability(FfxInt32x2 iPxPos)
{
LumaInstabilityFactorData data;
data.fLumaInstabilityFactor = 0.0f;
data.fLumaHistory = FfxFloat32x4(0.0f, 0.0f, 0.0f, 0.0f);
const FfxFloat32x2 fDilatedMotionVector = LoadDilatedMotionVector(iPxPos);
const FfxFloat32x2 fUv = (iPxPos + 0.5f) / RenderSize();
const FfxFloat32x2 fUvCurrFrameJittered = fUv + Jitter() / RenderSize();
const FfxFloat32x2 fUvPrevFrameJittered = fUv + PreviousFrameJitter() / PreviousFrameRenderSize();
const FfxFloat32x2 fReprojectedUv = fUvPrevFrameJittered + fDilatedMotionVector;
if (IsUvInside(fReprojectedUv))
{
const FfxFloat32x2 fUvReactive_HW = ClampUv(fUvCurrFrameJittered, RenderSize(), MaxRenderSize());
const FfxFloat32x4 fDilatedReactiveMasks = SampleDilatedReactiveMasks(fUvReactive_HW);
const FfxFloat32 fReactiveMask = ffxSaturate(fDilatedReactiveMasks[REACTIVE]);
const FfxFloat32 fDisocclusion = ffxSaturate(fDilatedReactiveMasks[DISOCCLUSION]);
const FfxFloat32 fShadingChange = ffxSaturate(fDilatedReactiveMasks[SHADING_CHANGE]);
const FfxFloat32 fAccumulation = ffxSaturate(fDilatedReactiveMasks[ACCUMULAION]);
const FfxBoolean bAccumulationFactor = fAccumulation > 0.9f;
const FfxBoolean bComputeInstability = bAccumulationFactor;
if (bComputeInstability) {
const FfxFloat32x2 fUv_HW = ClampUv(fUvCurrFrameJittered, RenderSize(), MaxRenderSize());
const FfxFloat32 fCurrentFrameLuma = SampleCurrentLuma(fUv_HW) * Exposure();
const FfxFloat32x2 fReprojectedUv_HW = ClampUv(fReprojectedUv, PreviousFrameRenderSize(), MaxRenderSize());
data.fLumaHistory = SampleLumaHistory(fReprojectedUv_HW) * DeltaPreExposure() * Exposure();
const FfxFloat32x2 fFarthestDepthUv_HW = ClampUv(fUvCurrFrameJittered, RenderSize() / 2, GetFarthestDepthMip1ResourceDimensions());
const FfxFloat32 fFarthestDepthInMeters = SampleFarthestDepthMip1(fFarthestDepthUv_HW);
data = ComputeLumaInstabilityFactor(data, fCurrentFrameLuma, fFarthestDepthInMeters);
const FfxFloat32 fVelocityWeight = 1.0f - ffxSaturate(Get4KVelocity(fDilatedMotionVector) / 20.0f);
data.fLumaInstabilityFactor *= fVelocityWeight * (1.0f - fDisocclusion) * (1.0f - fReactiveMask) * (1.0f - fShadingChange);
}
}
StoreLumaHistory(iPxPos, data.fLumaHistory);
StoreLumaInstability(iPxPos, data.fLumaInstabilityFactor);
}
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