78 lines
2.9 KiB
C
78 lines
2.9 KiB
C
// This file is part of the FidelityFX SDK.
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//
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// Copyright (C) 2024 Advanced Micro Devices, Inc.
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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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//
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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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#include "ffx_core.h"
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#include "ffx_dof_common.h"
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FfxUInt32x2 FfxDofCocRadInTiles(FfxFloat32x2 zMinMax)
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{
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FfxFloat32x2 rPx = abs(FfxDofGetCoc2(zMinMax));
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return FfxDofPxRadToTiles(rPx);
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}
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FfxUInt32 FfxDofMaxCocInTiles(FfxFloat32x2 zMinMax)
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{
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FfxUInt32x2 rTiles = FfxDofCocRadInTiles(zMinMax);
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return max(rTiles.x, rTiles.y);
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}
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/// Entry point for depth downsample function. SPD is not used for this,
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/// since we only need one specific downsampled resolution.
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///
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/// @param tile coordinate of the tile to run on (SV_DispatchThreadID)
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/// @param imageSize Size of the depth image (full resolution)
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/// @ingroup FfxGPUDof
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void DownsampleDepth(FfxUInt32x2 tile, FfxUInt32x2 imageSize)
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{
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FfxFloat32 minD = 1.0;
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FfxFloat32 maxD = 0.0;
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const FfxUInt32x2 coordBase = tile * FFX_DOF_DEPTH_TILE_SIZE;
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const FfxFloat32x2 rcpImageSize = ffxReciprocal(FfxFloat32x2(imageSize));
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for (FfxUInt32 yy = 0; yy < FFX_DOF_DEPTH_TILE_SIZE; yy += 2)
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{
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for (FfxUInt32 xx = 0; xx < FFX_DOF_DEPTH_TILE_SIZE; xx += 2)
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{
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FfxUInt32x2 coordInt = coordBase + FfxUInt32x2(xx, yy);
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FfxFloat32x2 coord = ffxSaturate(FfxFloat32x2(coordInt) * rcpImageSize);
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FfxFloat32x4 d = FfxDofGatherDepth(coord);
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FfxFloat32 lo = min(min(min(d.x, d.y), d.z), d.w);
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FfxFloat32 hi = max(max(max(d.x, d.y), d.z), d.w);
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minD = min(minD, lo);
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maxD = max(maxD, hi);
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}
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}
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#if FFX_DOF_OPTION_REVERSE_DEPTH
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// if Z-buffer is reversed, the nearest Z is the max.
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FfxFloat32x2 nearFarDepth = FfxFloat32x2(maxD, minD);
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#else
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FfxFloat32x2 nearFarDepth = FfxFloat32x2(minD, maxD);
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#endif
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FfxFloat32x2 coc = FfxDofGetCoc2(nearFarDepth);
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FfxUInt32 rTiles = FfxDofMaxCocInTiles(nearFarDepth);
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FfxDofAccumMaxTileRadius(rTiles);
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FfxDofStoreTileRadius(tile, coc);
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}
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