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Diffstat (limited to 'thirdparty/amd-fsr2/shaders/ffx_fsr2_upsample.h')
| -rw-r--r-- | thirdparty/amd-fsr2/shaders/ffx_fsr2_upsample.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/thirdparty/amd-fsr2/shaders/ffx_fsr2_upsample.h b/thirdparty/amd-fsr2/shaders/ffx_fsr2_upsample.h new file mode 100644 index 0000000000..abdb8888a9 --- /dev/null +++ b/thirdparty/amd-fsr2/shaders/ffx_fsr2_upsample.h @@ -0,0 +1,194 @@ +// This file is part of the FidelityFX SDK. +// +// Copyright (c) 2022-2023 Advanced Micro Devices, Inc. All rights reserved. +// +// 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. + +#ifndef FFX_FSR2_UPSAMPLE_H +#define FFX_FSR2_UPSAMPLE_H + +FFX_STATIC const FfxUInt32 iLanczos2SampleCount = 16; + +void Deringing(RectificationBox clippingBox, FFX_PARAMETER_INOUT FfxFloat32x3 fColor) +{ + fColor = clamp(fColor, clippingBox.aabbMin, clippingBox.aabbMax); +} +#if FFX_HALF +void Deringing(RectificationBoxMin16 clippingBox, FFX_PARAMETER_INOUT FFX_MIN16_F3 fColor) +{ + fColor = clamp(fColor, clippingBox.aabbMin, clippingBox.aabbMax); +} +#endif + +#ifndef FFX_FSR2_OPTION_UPSAMPLE_USE_LANCZOS_TYPE +#define FFX_FSR2_OPTION_UPSAMPLE_USE_LANCZOS_TYPE 2 // Approximate +#endif + +FfxFloat32 GetUpsampleLanczosWeight(FfxFloat32x2 fSrcSampleOffset, FfxFloat32 fKernelWeight) +{ + FfxFloat32x2 fSrcSampleOffsetBiased = fSrcSampleOffset * fKernelWeight.xx; +#if FFX_FSR2_OPTION_UPSAMPLE_USE_LANCZOS_TYPE == 0 // LANCZOS_TYPE_REFERENCE + FfxFloat32 fSampleWeight = Lanczos2(length(fSrcSampleOffsetBiased)); +#elif FFX_FSR2_OPTION_UPSAMPLE_USE_LANCZOS_TYPE == 1 // LANCZOS_TYPE_LUT + FfxFloat32 fSampleWeight = Lanczos2_UseLUT(length(fSrcSampleOffsetBiased)); +#elif FFX_FSR2_OPTION_UPSAMPLE_USE_LANCZOS_TYPE == 2 // LANCZOS_TYPE_APPROXIMATE + FfxFloat32 fSampleWeight = Lanczos2ApproxSq(dot(fSrcSampleOffsetBiased, fSrcSampleOffsetBiased)); +#else +#error "Invalid Lanczos type" +#endif + return fSampleWeight; +} + +#if FFX_HALF +FFX_MIN16_F GetUpsampleLanczosWeight(FFX_MIN16_F2 fSrcSampleOffset, FFX_MIN16_F fKernelWeight) +{ + FFX_MIN16_F2 fSrcSampleOffsetBiased = fSrcSampleOffset * fKernelWeight.xx; +#if FFX_FSR2_OPTION_UPSAMPLE_USE_LANCZOS_TYPE == 0 // LANCZOS_TYPE_REFERENCE + FFX_MIN16_F fSampleWeight = Lanczos2(length(fSrcSampleOffsetBiased)); +#elif FFX_FSR2_OPTION_UPSAMPLE_USE_LANCZOS_TYPE == 1 // LANCZOS_TYPE_LUT + FFX_MIN16_F fSampleWeight = Lanczos2_UseLUT(length(fSrcSampleOffsetBiased)); +#elif FFX_FSR2_OPTION_UPSAMPLE_USE_LANCZOS_TYPE == 2 // LANCZOS_TYPE_APPROXIMATE + FFX_MIN16_F fSampleWeight = Lanczos2ApproxSq(dot(fSrcSampleOffsetBiased, fSrcSampleOffsetBiased)); + + // To Test: Save reciproqual sqrt compute + // FfxFloat32 fSampleWeight = Lanczos2Sq_UseLUT(dot(fSrcSampleOffsetBiased, fSrcSampleOffsetBiased)); +#else +#error "Invalid Lanczos type" +#endif + return fSampleWeight; +} +#endif + +FfxFloat32 ComputeMaxKernelWeight() { + const FfxFloat32 fKernelSizeBias = 1.0f; + + FfxFloat32 fKernelWeight = FfxFloat32(1) + (FfxFloat32(1.0f) / FfxFloat32x2(DownscaleFactor()) - FfxFloat32(1)).x * FfxFloat32(fKernelSizeBias); + + return ffxMin(FfxFloat32(1.99f), fKernelWeight); +} + +FfxFloat32x4 ComputeUpsampledColorAndWeight(const AccumulationPassCommonParams params, + FFX_PARAMETER_INOUT RectificationBox clippingBox, FfxFloat32 fReactiveFactor) +{ + #if FFX_FSR2_OPTION_UPSAMPLE_SAMPLERS_USE_DATA_HALF && FFX_HALF + #include "ffx_fsr2_force16_begin.h" + #endif + // We compute a sliced lanczos filter with 2 lobes (other slices are accumulated temporaly) + FfxFloat32x2 fDstOutputPos = FfxFloat32x2(params.iPxHrPos) + FFX_BROADCAST_FLOAT32X2(0.5f); // Destination resolution output pixel center position + FfxFloat32x2 fSrcOutputPos = fDstOutputPos * DownscaleFactor(); // Source resolution output pixel center position + FfxInt32x2 iSrcInputPos = FfxInt32x2(floor(fSrcOutputPos)); // TODO: what about weird upscale factors... + + #if FFX_FSR2_OPTION_UPSAMPLE_SAMPLERS_USE_DATA_HALF && FFX_HALF + #include "ffx_fsr2_force16_end.h" + #endif + + FfxFloat32x3 fSamples[iLanczos2SampleCount]; + + FfxFloat32x2 fSrcUnjitteredPos = (FfxFloat32x2(iSrcInputPos) + FfxFloat32x2(0.5f, 0.5f)) - Jitter(); // This is the un-jittered position of the sample at offset 0,0 + + FfxInt32x2 offsetTL; + offsetTL.x = (fSrcUnjitteredPos.x > fSrcOutputPos.x) ? FfxInt32(-2) : FfxInt32(-1); + offsetTL.y = (fSrcUnjitteredPos.y > fSrcOutputPos.y) ? FfxInt32(-2) : FfxInt32(-1); + + //Load samples + // If fSrcUnjitteredPos.y > fSrcOutputPos.y, indicates offsetTL.y = -2, sample offset Y will be [-2, 1], clipbox will be rows [1, 3]. + // Flip row# for sampling offset in this case, so first 0~2 rows in the sampled array can always be used for computing the clipbox. + // This reduces branch or cmove on sampled colors, but moving this overhead to sample position / weight calculation time which apply to less values. + const FfxBoolean bFlipRow = fSrcUnjitteredPos.y > fSrcOutputPos.y; + const FfxBoolean bFlipCol = fSrcUnjitteredPos.x > fSrcOutputPos.x; + + FfxFloat32x2 fOffsetTL = FfxFloat32x2(offsetTL); + + FFX_UNROLL + for (FfxInt32 row = 0; row < 3; row++) { + + FFX_UNROLL + for (FfxInt32 col = 0; col < 3; col++) { + FfxInt32 iSampleIndex = col + (row << 2); + + FfxInt32x2 sampleColRow = FfxInt32x2(bFlipCol ? (3 - col) : col, bFlipRow ? (3 - row) : row); + FfxInt32x2 iSrcSamplePos = FfxInt32x2(iSrcInputPos) + offsetTL + sampleColRow; + + const FfxInt32x2 sampleCoord = ClampLoad(iSrcSamplePos, FfxInt32x2(0, 0), FfxInt32x2(RenderSize())); + + fSamples[iSampleIndex] = LoadPreparedInputColor(FfxInt32x2(sampleCoord)); + } + } + + FfxFloat32x4 fColorAndWeight = FfxFloat32x4(0.0f, 0.0f, 0.0f, 0.0f); + + FfxFloat32x2 fBaseSampleOffset = FfxFloat32x2(fSrcUnjitteredPos - fSrcOutputPos); + + // Identify how much of each upsampled color to be used for this frame + const FfxFloat32 fKernelReactiveFactor = ffxMax(fReactiveFactor, FfxFloat32(params.bIsNewSample)); + const FfxFloat32 fKernelBiasMax = ComputeMaxKernelWeight() * (1.0f - fKernelReactiveFactor); + + const FfxFloat32 fKernelBiasMin = ffxMax(1.0f, ((1.0f + fKernelBiasMax) * 0.3f)); + const FfxFloat32 fKernelBiasFactor = ffxMax(0.0f, ffxMax(0.25f * params.fDepthClipFactor, fKernelReactiveFactor)); + const FfxFloat32 fKernelBias = ffxLerp(fKernelBiasMax, fKernelBiasMin, fKernelBiasFactor); + + const FfxFloat32 fRectificationCurveBias = ffxLerp(-2.0f, -3.0f, ffxSaturate(params.fHrVelocity / 50.0f)); + + FFX_UNROLL + for (FfxInt32 row = 0; row < 3; row++) { + FFX_UNROLL + for (FfxInt32 col = 0; col < 3; col++) { + FfxInt32 iSampleIndex = col + (row << 2); + + const FfxInt32x2 sampleColRow = FfxInt32x2(bFlipCol ? (3 - col) : col, bFlipRow ? (3 - row) : row); + const FfxFloat32x2 fOffset = fOffsetTL + FfxFloat32x2(sampleColRow); + FfxFloat32x2 fSrcSampleOffset = fBaseSampleOffset + fOffset; + + FfxInt32x2 iSrcSamplePos = FfxInt32x2(iSrcInputPos) + FfxInt32x2(offsetTL) + sampleColRow; + + const FfxFloat32 fOnScreenFactor = FfxFloat32(IsOnScreen(FfxInt32x2(iSrcSamplePos), FfxInt32x2(RenderSize()))); + FfxFloat32 fSampleWeight = fOnScreenFactor * FfxFloat32(GetUpsampleLanczosWeight(fSrcSampleOffset, fKernelBias)); + + fColorAndWeight += FfxFloat32x4(fSamples[iSampleIndex] * fSampleWeight, fSampleWeight); + + // Update rectification box + { + const FfxFloat32 fSrcSampleOffsetSq = dot(fSrcSampleOffset, fSrcSampleOffset); + const FfxFloat32 fBoxSampleWeight = exp(fRectificationCurveBias * fSrcSampleOffsetSq); + + const FfxBoolean bInitialSample = (row == 0) && (col == 0); + RectificationBoxAddSample(bInitialSample, clippingBox, fSamples[iSampleIndex], fBoxSampleWeight); + } + } + } + + RectificationBoxComputeVarianceBoxData(clippingBox); + + fColorAndWeight.w *= FfxFloat32(fColorAndWeight.w > FSR2_EPSILON); + + if (fColorAndWeight.w > FSR2_EPSILON) { + // Normalize for deringing (we need to compare colors) + fColorAndWeight.xyz = fColorAndWeight.xyz / fColorAndWeight.w; + fColorAndWeight.w *= fUpsampleLanczosWeightScale; + + Deringing(clippingBox, fColorAndWeight.xyz); + } + + #if FFX_FSR2_OPTION_UPSAMPLE_SAMPLERS_USE_DATA_HALF && FFX_HALF + #include "ffx_fsr2_force16_end.h" + #endif + + return fColorAndWeight; +} + +#endif //!defined( FFX_FSR2_UPSAMPLE_H ) |