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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.
void Accumulate(const AccumulationPassCommonParams params, FFX_PARAMETER_INOUT AccumulationPassData data)
{
// Avoid invalid values when accumulation and upsampled weight is 0
data.fHistoryWeight *= FfxFloat32(data.fHistoryWeight > FSR3UPSCALER_FP16_MIN);
data.fHistoryWeight = ffxMax(FSR3UPSCALER_EPSILON, data.fHistoryWeight + data.fUpsampledWeight);
#if FFX_FSR3UPSCALER_OPTION_HDR_COLOR_INPUT
//YCoCg -> RGB -> Tonemap -> YCoCg (Use RGB tonemapper to avoid color desaturation)
data.fUpsampledColor = RGBToYCoCg(Tonemap(YCoCgToRGB(data.fUpsampledColor)));
data.fHistoryColor = RGBToYCoCg(Tonemap(YCoCgToRGB(data.fHistoryColor)));
#endif
const FfxFloat32 fAlpha = ffxSaturate(data.fUpsampledWeight / data.fHistoryWeight);
data.fHistoryColor = ffxLerp(data.fHistoryColor, data.fUpsampledColor, fAlpha);
data.fHistoryColor = YCoCgToRGB(data.fHistoryColor);
#if FFX_FSR3UPSCALER_OPTION_HDR_COLOR_INPUT
data.fHistoryColor = InverseTonemap(data.fHistoryColor);
#endif
}
void RectifyHistory(
const AccumulationPassCommonParams params,
FFX_PARAMETER_INOUT AccumulationPassData data
)
{
const FfxFloat32 f4kVelocityFactor = ffxSaturate(params.f4KVelocity / 20.0f);
const FfxFloat32 fDistanceFactor = ffxSaturate(0.75f - params.fFarthestDepthInMeters / 20.0f);
const FfxFloat32 fAccumulationFactor = 1.0f - params.fAccumulation;
const FfxFloat32 fReactiveFactor = ffxPow(params.fReactiveMask, 1.0f / 2.0f);
const FfxFloat32 fShadingChangeFactor = params.fShadingChange;
const FfxFloat32 fBoxScaleT = ffxMax(f4kVelocityFactor, ffxMax(fDistanceFactor, ffxMax(fAccumulationFactor, ffxMax(fReactiveFactor, fShadingChangeFactor))));
const FfxFloat32 fBoxScale = ffxLerp(3.0f, 1.0f, fBoxScaleT);
const FfxFloat32x3 fScaledBoxVec = data.clippingBox.boxVec * FfxFloat32x3(1.7f, 1.0f, 1.0f) * fBoxScale;
const FfxFloat32x3 fClampedScaledBoxVec = ffxMax(fScaledBoxVec, FfxFloat32x3(1.193e-7f, 1.193e-7f, 1.193e-7f));
const FfxFloat32x3 fTransformedHistoryColor = (data.fHistoryColor - data.clippingBox.boxCenter) / fClampedScaledBoxVec;
if (length(fTransformedHistoryColor)>1.f) {
const FfxFloat32x3 fClampedHistoryColor = normalize(fTransformedHistoryColor);
const FfxFloat32x3 fFinalClampedHistoryColor = (fClampedHistoryColor * fScaledBoxVec) + data.clippingBox.boxCenter;
// Scale history color using rectification info, also using accumulation mask to avoid potential invalid color protection
const FfxFloat32 fHistoryContribution = ffxMax(params.fLumaInstabilityFactor, data.fLockContributionThisFrame) * params.fAccumulation * (1 - params.fDisocclusion);
data.fHistoryColor = ffxLerp(fFinalClampedHistoryColor, data.fHistoryColor, ffxSaturate(fHistoryContribution));
}
}
void UpdateLockStatus(AccumulationPassCommonParams params, FFX_PARAMETER_INOUT AccumulationPassData data)
{
data.fLock *= FfxFloat32(params.bIsNewSample == false);
const FfxFloat32 fLifetimeDecreaseFactor = ffxMax(ffxSaturate(params.fShadingChange), ffxMax(params.fReactiveMask, params.fDisocclusion));
data.fLock = ffxMax(0.0f, data.fLock - fLifetimeDecreaseFactor * fLockMax);
// Compute this frame lock contribution
data.fLockContributionThisFrame = ffxSaturate(ffxSaturate(data.fLock - fLockThreshold) * (fLockMax - fLockThreshold));
const FfxFloat32 fNewLockIntensity = LoadRwNewLocks(params.iPxHrPos) * (1.0f - ffxMax(params.fShadingChange * 0, params.fReactiveMask));
data.fLock = ffxMax(0.0f, ffxMin(data.fLock + fNewLockIntensity, fLockMax));
// Preparing for next frame
const FfxFloat32 fLifetimeDecrease = (0.1f / JitterSequenceLength()) * (1.0f - fLifetimeDecreaseFactor);
data.fLock = ffxMax(0.0f, data.fLock - fLifetimeDecrease);
// we expect similar motion for next frame
// kill lock if that location is outside screen, avoid locks to be clamped to screen borders
const FfxFloat32x2 fEstimatedUvNextFrame = params.fHrUv - params.fMotionVector;
data.fLock *= FfxFloat32(IsUvInside(fEstimatedUvNextFrame) == true);
}
void ComputeBaseAccumulationWeight(const AccumulationPassCommonParams params, FFX_PARAMETER_INOUT AccumulationPassData data)
{
FfxFloat32 fBaseAccumulation = params.fAccumulation;
fBaseAccumulation = ffxMin(fBaseAccumulation, ffxLerp(fBaseAccumulation, 0.15f, ffxSaturate(ffxMax(0.0f, (params.f4KVelocity * VelocityFactor()) / 0.5f))));
data.fHistoryWeight = fBaseAccumulation;
}
void InitPassData(FfxInt32x2 iPxHrPos, FFX_PARAMETER_INOUT AccumulationPassCommonParams params, FFX_PARAMETER_INOUT AccumulationPassData data)
{
// Init constant params
params.iPxHrPos = iPxHrPos;
const FfxFloat32x2 fHrUv = (iPxHrPos + 0.5f) / UpscaleSize();
params.fHrUv = fHrUv;
params.fLrUvJittered = fHrUv + Jitter() / RenderSize();
params.fLrUv_HwSampler = ClampUv(params.fLrUvJittered, RenderSize(), MaxRenderSize());
params.fMotionVector = GetMotionVector(iPxHrPos, fHrUv);
params.f4KVelocity = Get4KVelocity(params.fMotionVector);
ComputeReprojectedUVs(params);
const FfxFloat32x2 fLumaInstabilityUv_HW = ClampUv(fHrUv, RenderSize(), MaxRenderSize());
params.fLumaInstabilityFactor = SampleLumaInstability(fLumaInstabilityUv_HW);
const FfxFloat32x2 fFarthestDepthUv = ClampUv(params.fLrUvJittered, RenderSize() / 2, GetFarthestDepthMip1ResourceDimensions());
params.fFarthestDepthInMeters = SampleFarthestDepthMip1(fFarthestDepthUv);
params.bIsNewSample = (params.bIsExistingSample == false || 0 == FrameIndex());
const FfxFloat32x4 fDilatedReactiveMasks = SampleDilatedReactiveMasks(params.fLrUv_HwSampler);
params.fReactiveMask = ffxSaturate(fDilatedReactiveMasks[REACTIVE]);
params.fDisocclusion = ffxSaturate(fDilatedReactiveMasks[DISOCCLUSION]);
params.fShadingChange = ffxSaturate(fDilatedReactiveMasks[SHADING_CHANGE]);
params.fAccumulation = ffxSaturate(fDilatedReactiveMasks[ACCUMULAION]);
params.fAccumulation *= FfxFloat32(round(params.fAccumulation * 100.0f) > 1.0f);
// Init variable data
data.fUpsampledColor = FfxFloat32x3(0.0f, 0.0f, 0.0f);
data.fHistoryColor = FfxFloat32x3(0.0f, 0.0f, 0.0f);
data.fHistoryWeight = 1.0f;
data.fUpsampledWeight = 0.0f;
data.fLock = 0.0f;
data.fLockContributionThisFrame = 0.0f;
}
void Accumulate(FfxInt32x2 iPxHrPos)
{
AccumulationPassCommonParams params;
AccumulationPassData data;
InitPassData(iPxHrPos, params, data);
if (params.bIsExistingSample && !params.bIsNewSample) {
ReprojectHistoryColor(params, data);
}
UpdateLockStatus(params, data);
ComputeBaseAccumulationWeight(params, data);
ComputeUpsampledColorAndWeight(params, data);
RectifyHistory(params, data);
Accumulate(params, data);
data.fHistoryColor /= Exposure();
data.fHistoryColor = ffxMax(data.fHistoryColor, FfxFloat32x3(0.0f, 0.0f, 0.0f));
StoreInternalColorAndWeight(iPxHrPos, FfxFloat32x4(data.fHistoryColor, data.fLock));
// Output final color when RCAS is disabled
#if FFX_FSR3UPSCALER_OPTION_APPLY_SHARPENING == 0
StoreUpscaledOutput(iPxHrPos, data.fHistoryColor);
#endif
StoreNewLocks(iPxHrPos, 0);
}
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