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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 ReconstructPrevDepth(FfxInt32x2 iPxPos, FfxFloat32 fDepth, FfxFloat32x2 fMotionVector)
{
const FfxFloat32 fNearestDepthInMeters = ffxMin(GetViewSpaceDepthInMeters(fDepth), FSR3UPSCALER_FP16_MAX);
const FfxFloat32 fReconstructedDeptMvThreshold = ReconstructedDepthMvPxThreshold(fNearestDepthInMeters);
// Discard small mvs
fMotionVector *= FfxFloat32(Get4KVelocity(fMotionVector) > fReconstructedDeptMvThreshold);
const FfxFloat32x2 fUv = (iPxPos + FfxFloat32(0.5)) / RenderSize();
const FfxFloat32x2 fReprojectedUv = fUv + fMotionVector;
const BilinearSamplingData bilinearInfo = GetBilinearSamplingData(fReprojectedUv, RenderSize());
// Project current depth into previous frame locations.
// Push to all pixels having some contribution if reprojection is using bilinear logic.
for (FfxInt32 iSampleIndex = 0; iSampleIndex < 4; iSampleIndex++) {
const FfxInt32x2 iOffset = bilinearInfo.iOffsets[iSampleIndex];
const FfxFloat32 fWeight = bilinearInfo.fWeights[iSampleIndex];
if (fWeight > fReconstructedDepthBilinearWeightThreshold) {
const FfxInt32x2 iStorePos = bilinearInfo.iBasePos + iOffset;
if (IsOnScreen(iStorePos, RenderSize())) {
StoreReconstructedDepth(iStorePos, fDepth);
}
}
}
}
struct DepthExtents
{
FfxFloat32 fNearest;
FfxInt32x2 fNearestCoord;
FfxFloat32 fFarthest;
};
DepthExtents FindDepthExtents(FFX_PARAMETER_IN FfxInt32x2 iPxPos)
{
DepthExtents extents;
const FfxInt32 iSampleCount = 9;
const FfxInt32x2 iSampleOffsets[iSampleCount] = {
FfxInt32x2(+0, +0),
FfxInt32x2(+1, +0),
FfxInt32x2(+0, +1),
FfxInt32x2(+0, -1),
FfxInt32x2(-1, +0),
FfxInt32x2(-1, +1),
FfxInt32x2(+1, +1),
FfxInt32x2(-1, -1),
FfxInt32x2(+1, -1),
};
// pull out the depth loads to allow SC to batch them
FfxFloat32 depth[9];
FfxInt32 iSampleIndex = 0;
FFX_UNROLL
for (iSampleIndex = 0; iSampleIndex < iSampleCount; ++iSampleIndex) {
FfxInt32x2 iPos = iPxPos + iSampleOffsets[iSampleIndex];
depth[iSampleIndex] = LoadInputDepth(iPos);
}
// find closest depth
extents.fNearestCoord = iPxPos;
extents.fNearest = depth[0];
extents.fFarthest = depth[0];
FFX_UNROLL
for (iSampleIndex = 1; iSampleIndex < iSampleCount; ++iSampleIndex) {
const FfxInt32x2 iPos = iPxPos + iSampleOffsets[iSampleIndex];
if (IsOnScreen(iPos, RenderSize())) {
FfxFloat32 fNdDepth = depth[iSampleIndex];
#if FFX_FSR3UPSCALER_OPTION_INVERTED_DEPTH
if (fNdDepth > extents.fNearest) {
extents.fFarthest = ffxMin(extents.fFarthest, fNdDepth);
#else
if (fNdDepth < extents.fNearest) {
extents.fFarthest = ffxMax(extents.fFarthest, fNdDepth);
#endif
extents.fNearestCoord = iPos;
extents.fNearest = fNdDepth;
}
}
}
return extents;
}
FfxFloat32x2 DilateMotionVector(FfxInt32x2 iPxPos, const DepthExtents depthExtents)
{
#if FFX_FSR3UPSCALER_OPTION_LOW_RESOLUTION_MOTION_VECTORS
const FfxInt32x2 iSamplePos = iPxPos;
const FfxInt32x2 iMotionVectorPos = depthExtents.fNearestCoord;
#else
const FfxInt32x2 iSamplePos = ComputeHrPosFromLrPos(iPxPos);
const FfxInt32x2 iMotionVectorPos = ComputeHrPosFromLrPos(depthExtents.fNearestCoord);
#endif
const FfxFloat32x2 fDilatedMotionVector = LoadInputMotionVector(iMotionVectorPos);
return fDilatedMotionVector;
}
FfxFloat32 GetCurrentFrameLuma(FfxInt32x2 iPxPos)
{
//We assume linear data. if non-linear input (sRGB, ...),
//then we should convert to linear first and back to sRGB on output.
const FfxFloat32x3 fRgb = ffxMax(FfxFloat32x3(0, 0, 0), LoadInputColor(iPxPos));
const FfxFloat32 fLuma = RGBToLuma(fRgb);
return fLuma;
}
void PrepareInputs(FfxInt32x2 iPxPos)
{
const DepthExtents depthExtents = FindDepthExtents(iPxPos);
const FfxFloat32x2 fDilatedMotionVector = DilateMotionVector(iPxPos, depthExtents);
ReconstructPrevDepth(iPxPos, depthExtents.fNearest, fDilatedMotionVector);
StoreDilatedMotionVector(iPxPos, fDilatedMotionVector);
StoreDilatedDepth(iPxPos, depthExtents.fNearest);
const FfxFloat32 fFarthestDepthInMeters = ffxMin(GetViewSpaceDepthInMeters(depthExtents.fFarthest), FSR3UPSCALER_FP16_MAX);
StoreFarthestDepth(iPxPos, fFarthestDepthInMeters);
const FfxFloat32 fLuma = GetCurrentFrameLuma(iPxPos);
StoreCurrentLuma(iPxPos, fLuma);
}
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