127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
// This file is part of the FidelityFX SDK.
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//
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// Copyright (c) 2022 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_LOCK_H
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#define FFX_FSR2_LOCK_H
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FfxFloat32 GetLuma(FfxInt32x2 pos)
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{
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//add some bias to avoid locking dark areas
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return FfxFloat32(LoadPreparedInputColorLuma(pos));
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}
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FfxFloat32 ComputeThinFeatureConfidence(FfxInt32x2 pos)
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{
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const FfxInt32 RADIUS = 1;
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FfxFloat32 fNucleus = GetLuma(pos);
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FfxFloat32 similar_threshold = 1.05f;
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FfxFloat32 dissimilarLumaMin = FSR2_FLT_MAX;
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FfxFloat32 dissimilarLumaMax = 0;
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/*
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0 1 2
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3 4 5
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6 7 8
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*/
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#define SETBIT(x) (1U << x)
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FfxUInt32 mask = SETBIT(4); //flag fNucleus as similar
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const FfxUInt32 rejectionMasks[4] = {
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SETBIT(0) | SETBIT(1) | SETBIT(3) | SETBIT(4), //Upper left
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SETBIT(1) | SETBIT(2) | SETBIT(4) | SETBIT(5), //Upper right
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SETBIT(3) | SETBIT(4) | SETBIT(6) | SETBIT(7), //Lower left
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SETBIT(4) | SETBIT(5) | SETBIT(7) | SETBIT(8), //Lower right
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};
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FfxInt32 idx = 0;
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FFX_UNROLL
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for (FfxInt32 y = -RADIUS; y <= RADIUS; y++) {
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FFX_UNROLL
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for (FfxInt32 x = -RADIUS; x <= RADIUS; x++, idx++) {
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if (x == 0 && y == 0) continue;
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FfxInt32x2 samplePos = ClampLoad(pos, FfxInt32x2(x, y), FfxInt32x2(RenderSize()));
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FfxFloat32 sampleLuma = GetLuma(samplePos);
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FfxFloat32 difference = ffxMax(sampleLuma, fNucleus) / ffxMin(sampleLuma, fNucleus);
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if (difference > 0 && (difference < similar_threshold)) {
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mask |= SETBIT(idx);
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} else {
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dissimilarLumaMin = ffxMin(dissimilarLumaMin, sampleLuma);
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dissimilarLumaMax = ffxMax(dissimilarLumaMax, sampleLuma);
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}
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}
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}
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FfxBoolean isRidge = fNucleus > dissimilarLumaMax || fNucleus < dissimilarLumaMin;
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if (FFX_FALSE == isRidge) {
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return 0;
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}
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FFX_UNROLL
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for (FfxInt32 i = 0; i < 4; i++) {
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if ((mask & rejectionMasks[i]) == rejectionMasks[i]) {
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return 0;
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}
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}
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return 1;
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}
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FFX_STATIC FfxBoolean s_bLockUpdated = FFX_FALSE;
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FfxFloat32x3 ComputeLockStatus(FfxInt32x2 iPxLrPos, FfxFloat32x3 fLockStatus)
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{
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FfxFloat32 fConfidenceOfThinFeature = ComputeThinFeatureConfidence(iPxLrPos);
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s_bLockUpdated = FFX_FALSE;
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if (fConfidenceOfThinFeature > 0.0f)
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{
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//put to negative on new lock
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fLockStatus[LOCK_LIFETIME_REMAINING] = (fLockStatus[LOCK_LIFETIME_REMAINING] == FfxFloat32(0.0f)) ? FfxFloat32(-LockInitialLifetime()) : FfxFloat32(-(LockInitialLifetime() * 2));
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s_bLockUpdated = FFX_TRUE;
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}
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return fLockStatus;
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}
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void ComputeLock(FfxInt32x2 iPxLrPos)
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{
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FfxInt32x2 iPxHrPos = ComputeHrPosFromLrPos(iPxLrPos);
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FfxFloat32x3 fLockStatus = ComputeLockStatus(iPxLrPos, LoadLockStatus(iPxHrPos));
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if ((s_bLockUpdated)) {
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StoreLockStatus(iPxHrPos, fLockStatus);
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}
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}
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#endif // FFX_FSR2_LOCK_H
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