296 lines
13 KiB
C++
296 lines
13 KiB
C++
// This file is part of the FidelityFX SDK.
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//
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// Copyright (c) 2022-2023 Advanced Micro Devices, Inc. All rights reserved.
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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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// The above copyright notice and this permission notice 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
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// THE SOFTWARE.
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#ifndef FFX_FSR2_ACCUMULATE_H
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#define FFX_FSR2_ACCUMULATE_H
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FfxFloat32 GetPxHrVelocity(FfxFloat32x2 fMotionVector)
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{
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return length(fMotionVector * DisplaySize());
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}
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#if FFX_HALF
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FFX_MIN16_F GetPxHrVelocity(FFX_MIN16_F2 fMotionVector)
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{
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return length(fMotionVector * FFX_MIN16_F2(DisplaySize()));
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}
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#endif
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void Accumulate(const AccumulationPassCommonParams params, FFX_PARAMETER_INOUT FfxFloat32x3 fHistoryColor, FfxFloat32x3 fAccumulation, FFX_PARAMETER_IN FfxFloat32x4 fUpsampledColorAndWeight)
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{
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// Aviod invalid values when accumulation and upsampled weight is 0
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fAccumulation = ffxMax(FSR2_EPSILON.xxx, fAccumulation + fUpsampledColorAndWeight.www);
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#if FFX_FSR2_OPTION_HDR_COLOR_INPUT
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//YCoCg -> RGB -> Tonemap -> YCoCg (Use RGB tonemapper to avoid color desaturation)
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fUpsampledColorAndWeight.xyz = RGBToYCoCg(Tonemap(YCoCgToRGB(fUpsampledColorAndWeight.xyz)));
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fHistoryColor = RGBToYCoCg(Tonemap(YCoCgToRGB(fHistoryColor)));
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#endif
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const FfxFloat32x3 fAlpha = fUpsampledColorAndWeight.www / fAccumulation;
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fHistoryColor = ffxLerp(fHistoryColor, fUpsampledColorAndWeight.xyz, fAlpha);
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fHistoryColor = YCoCgToRGB(fHistoryColor);
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#if FFX_FSR2_OPTION_HDR_COLOR_INPUT
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fHistoryColor = InverseTonemap(fHistoryColor);
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#endif
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}
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void RectifyHistory(
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const AccumulationPassCommonParams params,
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RectificationBox clippingBox,
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FFX_PARAMETER_INOUT FfxFloat32x3 fHistoryColor,
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FFX_PARAMETER_INOUT FfxFloat32x3 fAccumulation,
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FfxFloat32 fLockContributionThisFrame,
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FfxFloat32 fTemporalReactiveFactor,
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FfxFloat32 fLumaInstabilityFactor)
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{
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FfxFloat32 fScaleFactorInfluence = ffxMin(20.0f, ffxPow(FfxFloat32(1.0f / length(DownscaleFactor().x * DownscaleFactor().y)), 3.0f));
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const FfxFloat32 fVecolityFactor = ffxSaturate(params.fHrVelocity / 20.0f);
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const FfxFloat32 fBoxScaleT = ffxMax(params.fDepthClipFactor, ffxMax(params.fAccumulationMask, fVecolityFactor));
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FfxFloat32 fBoxScale = ffxLerp(fScaleFactorInfluence, 1.0f, fBoxScaleT);
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FfxFloat32x3 fScaledBoxVec = clippingBox.boxVec * fBoxScale;
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FfxFloat32x3 boxMin = clippingBox.boxCenter - fScaledBoxVec;
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FfxFloat32x3 boxMax = clippingBox.boxCenter + fScaledBoxVec;
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FfxFloat32x3 boxCenter = clippingBox.boxCenter;
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FfxFloat32 boxVecSize = length(clippingBox.boxVec);
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boxMin = ffxMax(clippingBox.aabbMin, boxMin);
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boxMax = ffxMin(clippingBox.aabbMax, boxMax);
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if (any(FFX_GREATER_THAN(boxMin, fHistoryColor)) || any(FFX_GREATER_THAN(fHistoryColor, boxMax))) {
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const FfxFloat32x3 fClampedHistoryColor = clamp(fHistoryColor, boxMin, boxMax);
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FfxFloat32x3 fHistoryContribution = ffxMax(fLumaInstabilityFactor, fLockContributionThisFrame).xxx;
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const FfxFloat32 fReactiveFactor = params.fDilatedReactiveFactor;
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const FfxFloat32 fReactiveContribution = 1.0f - ffxPow(fReactiveFactor, 1.0f / 2.0f);
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fHistoryContribution *= fReactiveContribution;
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// Scale history color using rectification info, also using accumulation mask to avoid potential invalid color protection
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fHistoryColor = ffxLerp(fClampedHistoryColor, fHistoryColor, ffxSaturate(fHistoryContribution));
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// Scale accumulation using rectification info
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const FfxFloat32x3 fAccumulationMin = ffxMin(fAccumulation, FFX_BROADCAST_FLOAT32X3(0.1f));
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fAccumulation = ffxLerp(fAccumulationMin, fAccumulation, ffxSaturate(fHistoryContribution));
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}
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}
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void WriteUpscaledOutput(FfxInt32x2 iPxHrPos, FfxFloat32x3 fUpscaledColor)
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{
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StoreUpscaledOutput(iPxHrPos, fUpscaledColor);
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}
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void FinalizeLockStatus(const AccumulationPassCommonParams params, FfxFloat32x2 fLockStatus, FfxFloat32 fUpsampledWeight)
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{
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// we expect similar motion for next frame
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// kill lock if that location is outside screen, avoid locks to be clamped to screen borders
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FfxFloat32x2 fEstimatedUvNextFrame = params.fHrUv - params.fMotionVector;
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if (IsUvInside(fEstimatedUvNextFrame) == false) {
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KillLock(fLockStatus);
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}
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else {
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// Decrease lock lifetime
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const FfxFloat32 fLifetimeDecreaseLanczosMax = FfxFloat32(JitterSequenceLength()) * FfxFloat32(fAverageLanczosWeightPerFrame);
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const FfxFloat32 fLifetimeDecrease = FfxFloat32(fUpsampledWeight / fLifetimeDecreaseLanczosMax);
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fLockStatus[LOCK_LIFETIME_REMAINING] = ffxMax(FfxFloat32(0), fLockStatus[LOCK_LIFETIME_REMAINING] - fLifetimeDecrease);
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}
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StoreLockStatus(params.iPxHrPos, fLockStatus);
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}
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FfxFloat32x3 ComputeBaseAccumulationWeight(const AccumulationPassCommonParams params, FfxFloat32 fThisFrameReactiveFactor, FfxBoolean bInMotionLastFrame, FfxFloat32 fUpsampledWeight, LockState lockState)
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{
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// Always assume max accumulation was reached
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FfxFloat32 fBaseAccumulation = fMaxAccumulationLanczosWeight * FfxFloat32(params.bIsExistingSample) * (1.0f - fThisFrameReactiveFactor) * (1.0f - params.fDepthClipFactor);
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fBaseAccumulation = ffxMin(fBaseAccumulation, ffxLerp(fBaseAccumulation, fUpsampledWeight * 10.0f, ffxMax(FfxFloat32(bInMotionLastFrame), ffxSaturate(params.fHrVelocity * FfxFloat32(10)))));
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fBaseAccumulation = ffxMin(fBaseAccumulation, ffxLerp(fBaseAccumulation, fUpsampledWeight, ffxSaturate(params.fHrVelocity / FfxFloat32(20))));
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return fBaseAccumulation.xxx;
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}
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FfxFloat32 ComputeLumaInstabilityFactor(const AccumulationPassCommonParams params, RectificationBox clippingBox, FfxFloat32 fThisFrameReactiveFactor, FfxFloat32 fLuminanceDiff)
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{
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const FfxFloat32 fUnormThreshold = 1.0f / 255.0f;
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const FfxInt32 N_MINUS_1 = 0;
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const FfxInt32 N_MINUS_2 = 1;
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const FfxInt32 N_MINUS_3 = 2;
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const FfxInt32 N_MINUS_4 = 3;
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FfxFloat32 fCurrentFrameLuma = clippingBox.boxCenter.x;
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#if FFX_FSR2_OPTION_HDR_COLOR_INPUT
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fCurrentFrameLuma = fCurrentFrameLuma / (1.0f + ffxMax(0.0f, fCurrentFrameLuma));
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#endif
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fCurrentFrameLuma = round(fCurrentFrameLuma * 255.0f) / 255.0f;
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const FfxBoolean bSampleLumaHistory = (ffxMax(ffxMax(params.fDepthClipFactor, params.fAccumulationMask), fLuminanceDiff) < 0.1f) && (params.bIsNewSample == false);
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FfxFloat32x4 fCurrentFrameLumaHistory = bSampleLumaHistory ? SampleLumaHistory(params.fReprojectedHrUv) : FFX_BROADCAST_FLOAT32X4(0.0f);
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FfxFloat32 fLumaInstability = 0.0f;
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FfxFloat32 fDiffs0 = (fCurrentFrameLuma - fCurrentFrameLumaHistory[N_MINUS_1]);
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FfxFloat32 fMin = abs(fDiffs0);
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if (fMin >= fUnormThreshold)
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{
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for (int i = N_MINUS_2; i <= N_MINUS_4; i++) {
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FfxFloat32 fDiffs1 = (fCurrentFrameLuma - fCurrentFrameLumaHistory[i]);
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if (sign(fDiffs0) == sign(fDiffs1)) {
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// Scale difference to protect historically similar values
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const FfxFloat32 fMinBias = 1.0f;
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fMin = ffxMin(fMin, abs(fDiffs1) * fMinBias);
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}
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}
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const FfxFloat32 fBoxSize = clippingBox.boxVec.x;
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const FfxFloat32 fBoxSizeFactor = ffxPow(ffxSaturate(fBoxSize / 0.1f), 6.0f);
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fLumaInstability = FfxFloat32(fMin != abs(fDiffs0)) * fBoxSizeFactor;
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fLumaInstability = FfxFloat32(fLumaInstability > fUnormThreshold);
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fLumaInstability *= 1.0f - ffxMax(params.fAccumulationMask, ffxPow(fThisFrameReactiveFactor, 1.0f / 6.0f));
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}
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//shift history
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fCurrentFrameLumaHistory[N_MINUS_4] = fCurrentFrameLumaHistory[N_MINUS_3];
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fCurrentFrameLumaHistory[N_MINUS_3] = fCurrentFrameLumaHistory[N_MINUS_2];
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fCurrentFrameLumaHistory[N_MINUS_2] = fCurrentFrameLumaHistory[N_MINUS_1];
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fCurrentFrameLumaHistory[N_MINUS_1] = fCurrentFrameLuma;
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StoreLumaHistory(params.iPxHrPos, fCurrentFrameLumaHistory);
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return fLumaInstability * FfxFloat32(fCurrentFrameLumaHistory[N_MINUS_4] != 0);
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}
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FfxFloat32 ComputeTemporalReactiveFactor(const AccumulationPassCommonParams params, FfxFloat32 fTemporalReactiveFactor)
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{
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FfxFloat32 fNewFactor = ffxMin(0.99f, fTemporalReactiveFactor);
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fNewFactor = ffxMax(fNewFactor, ffxLerp(fNewFactor, 0.4f, ffxSaturate(params.fHrVelocity)));
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fNewFactor = ffxMax(fNewFactor * fNewFactor, ffxMax(params.fDepthClipFactor * 0.1f, params.fDilatedReactiveFactor));
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// Force reactive factor for new samples
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fNewFactor = params.bIsNewSample ? 1.0f : fNewFactor;
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if (ffxSaturate(params.fHrVelocity * 10.0f) >= 1.0f) {
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fNewFactor = ffxMax(FSR2_EPSILON, fNewFactor) * -1.0f;
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}
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return fNewFactor;
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}
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AccumulationPassCommonParams InitParams(FfxInt32x2 iPxHrPos)
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{
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AccumulationPassCommonParams params;
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params.iPxHrPos = iPxHrPos;
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const FfxFloat32x2 fHrUv = (iPxHrPos + 0.5f) / DisplaySize();
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params.fHrUv = fHrUv;
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const FfxFloat32x2 fLrUvJittered = fHrUv + Jitter() / RenderSize();
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params.fLrUv_HwSampler = ClampUv(fLrUvJittered, RenderSize(), MaxRenderSize());
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params.fMotionVector = GetMotionVector(iPxHrPos, fHrUv);
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params.fHrVelocity = GetPxHrVelocity(params.fMotionVector);
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ComputeReprojectedUVs(params, params.fReprojectedHrUv, params.bIsExistingSample);
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params.fDepthClipFactor = ffxSaturate(SampleDepthClip(params.fLrUv_HwSampler));
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const FfxFloat32x2 fDilatedReactiveMasks = SampleDilatedReactiveMasks(params.fLrUv_HwSampler);
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params.fDilatedReactiveFactor = fDilatedReactiveMasks.x;
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params.fAccumulationMask = fDilatedReactiveMasks.y;
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params.bIsResetFrame = (0 == FrameIndex());
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params.bIsNewSample = (params.bIsExistingSample == false || params.bIsResetFrame);
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return params;
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}
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void Accumulate(FfxInt32x2 iPxHrPos)
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{
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const AccumulationPassCommonParams params = InitParams(iPxHrPos);
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FfxFloat32x3 fHistoryColor = FfxFloat32x3(0, 0, 0);
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FfxFloat32x2 fLockStatus;
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InitializeNewLockSample(fLockStatus);
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FfxFloat32 fTemporalReactiveFactor = 0.0f;
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FfxBoolean bInMotionLastFrame = FFX_FALSE;
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LockState lockState = { FFX_FALSE , FFX_FALSE };
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if (params.bIsExistingSample && !params.bIsResetFrame) {
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ReprojectHistoryColor(params, fHistoryColor, fTemporalReactiveFactor, bInMotionLastFrame);
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lockState = ReprojectHistoryLockStatus(params, fLockStatus);
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}
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FfxFloat32 fThisFrameReactiveFactor = ffxMax(params.fDilatedReactiveFactor, fTemporalReactiveFactor);
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FfxFloat32 fLuminanceDiff = 0.0f;
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FfxFloat32 fLockContributionThisFrame = 0.0f;
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UpdateLockStatus(params, fThisFrameReactiveFactor, lockState, fLockStatus, fLockContributionThisFrame, fLuminanceDiff);
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// Load upsampled input color
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RectificationBox clippingBox;
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FfxFloat32x4 fUpsampledColorAndWeight = ComputeUpsampledColorAndWeight(params, clippingBox, fThisFrameReactiveFactor);
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const FfxFloat32 fLumaInstabilityFactor = ComputeLumaInstabilityFactor(params, clippingBox, fThisFrameReactiveFactor, fLuminanceDiff);
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FfxFloat32x3 fAccumulation = ComputeBaseAccumulationWeight(params, fThisFrameReactiveFactor, bInMotionLastFrame, fUpsampledColorAndWeight.w, lockState);
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if (params.bIsNewSample) {
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fHistoryColor = YCoCgToRGB(fUpsampledColorAndWeight.xyz);
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}
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else {
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RectifyHistory(params, clippingBox, fHistoryColor, fAccumulation, fLockContributionThisFrame, fThisFrameReactiveFactor, fLumaInstabilityFactor);
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Accumulate(params, fHistoryColor, fAccumulation, fUpsampledColorAndWeight);
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}
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fHistoryColor = UnprepareRgb(fHistoryColor, Exposure());
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FinalizeLockStatus(params, fLockStatus, fUpsampledColorAndWeight.w);
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// Get new temporal reactive factor
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fTemporalReactiveFactor = ComputeTemporalReactiveFactor(params, fThisFrameReactiveFactor);
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StoreInternalColorAndWeight(iPxHrPos, FfxFloat32x4(fHistoryColor, fTemporalReactiveFactor));
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// Output final color when RCAS is disabled
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#if FFX_FSR2_OPTION_APPLY_SHARPENING == 0
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WriteUpscaledOutput(iPxHrPos, fHistoryColor);
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#endif
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StoreNewLocks(iPxHrPos, 0);
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}
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#endif // FFX_FSR2_ACCUMULATE_H
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