117 lines
4.9 KiB
C
117 lines
4.9 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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#ifndef FFX_BRIXELIZER_BRICK_COMMON_H
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#define FFX_BRIXELIZER_BRICK_COMMON_H
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#include "ffx_brixelizer_common.h"
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FfxUInt32 FfxBrixelizerBrickGetIndex(FfxUInt32 brick_id)
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{
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return brick_id & FFX_BRIXELIZER_BRICK_ID_MASK;
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}
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FfxUInt32x3 FfxBrixelizerWrapCoords(FfxInt32x3 clipmap_offset, FfxUInt32 wrap_mask, FfxUInt32x3 voxel_coord)
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{
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return (voxel_coord + FfxUInt32x3(clipmap_offset)) & FfxUInt32x3(wrap_mask, wrap_mask, wrap_mask);
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}
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FfxUInt32x3 FfxBrixelizerWrapCoords(FfxBrixelizerCascadeInfo cinfo, FfxUInt32x3 voxel_coord)
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{
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return (voxel_coord + cinfo.clipmap_offset) & FfxUInt32x3(FFX_BRIXELIZER_CASCADE_WRAP_MASK, FFX_BRIXELIZER_CASCADE_WRAP_MASK, FFX_BRIXELIZER_CASCADE_WRAP_MASK);
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}
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FfxUInt32 FfxBrixelizerLoadBrickIDUniform(FfxUInt32 voxel_flat_id, FfxUInt32 cascade_id)
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{
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return LoadCascadeBrickMapArrayUniform(cascade_id, voxel_flat_id);
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}
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FfxUInt32x3 FfxBrixelizerGetSDFAtlasOffset(FfxUInt32 brick_id)
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{
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FfxUInt32 dim = 8;
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FfxUInt32 offset = FfxBrixelizerBrickGetIndex(brick_id);
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FfxUInt32 bperdim = FFX_BRIXELIZER_STATIC_CONFIG_SDF_ATLAS_SIZE / dim;
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FfxUInt32 xoffset = offset % bperdim;
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FfxUInt32 yoffset = (offset / bperdim) % bperdim;
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FfxUInt32 zoffset = (offset / bperdim / bperdim);
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return FfxUInt32x3(xoffset, yoffset, zoffset) * dim;
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}
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struct FfxBxAtlasBounds
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{
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FfxUInt32 brick_dim;
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FfxFloat32x3 uvw_min;
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FfxFloat32x3 uvw_max;
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};
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FfxBxAtlasBounds FfxBrixelizerGetAtlasBounds(FfxUInt32 brick_id)
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{
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FfxUInt32x3 brick_offset = FfxBrixelizerGetSDFAtlasOffset(brick_id);
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FfxBxAtlasBounds bounds;
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bounds.brick_dim = FfxUInt32(8);
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bounds.uvw_min = (FfxFloat32x3(brick_offset) + FFX_BROADCAST_FLOAT32X3(0.5)) / FFX_BRIXELIZER_STATIC_CONFIG_SDF_ATLAS_SIZE;
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bounds.uvw_max = (FfxFloat32x3(brick_offset) + FFX_BROADCAST_FLOAT32X3(float(8.0 - 0.5))) / FFX_BRIXELIZER_STATIC_CONFIG_SDF_ATLAS_SIZE;
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return bounds;
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}
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FfxFloat32 FfxBrixelizerSampleBrixelDistance(FfxUInt32 brick_id, FfxFloat32x3 uvw)
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{
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FfxUInt32 brick_dim = FfxUInt32(8);
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FfxFloat32 idim = FfxFloat32(1.0) / FfxFloat32(brick_dim);
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FfxUInt32 texture_offset = FfxBrixelizerBrickGetIndex(brick_id);
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// Offset for 7x7x7 region
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FfxUInt32x3 brick_offset = FfxBrixelizerGetSDFAtlasOffset(brick_id);
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FfxFloat32x3 uvw_min = (FfxFloat32x3(brick_offset) + FFX_BROADCAST_FLOAT32X3(0.5)) / FFX_BRIXELIZER_STATIC_CONFIG_SDF_ATLAS_SIZE;
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FfxFloat32x3 uvw_max = (FfxFloat32x3(brick_offset) + FFX_BROADCAST_FLOAT32X3(FfxFloat32(brick_dim - FfxFloat32(0.5)))) / FFX_BRIXELIZER_STATIC_CONFIG_SDF_ATLAS_SIZE;
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uvw = ffxLerp(uvw_min, uvw_max, uvw);
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return SampleSDFAtlas(uvw);
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}
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FfxFloat32 FfxBrixelizerSampleBrixelDistance(FfxFloat32x3 uvw_min, FfxFloat32x3 uvw_max, FfxFloat32x3 uvw)
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{
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uvw = ffxLerp(uvw_min, uvw_max, uvw);
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return SampleSDFAtlas(uvw);
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}
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FfxFloat32x3 FfxBrixelizerGetBrixelGrad(FfxFloat32x3 uvw_min, FfxFloat32x3 uvw_max, FfxFloat32x3 uvw) {
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FfxFloat32 EPS = FfxFloat32(0.25) / (FfxFloat32(8.0) - FfxFloat32(1.0));
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FfxFloat32x4 k = FfxFloat32x4(1.0, 1.0, 1.0, 0.0);
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if (uvw.x > FfxFloat32(0.5)) k.x = -k.x;
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if (uvw.y > FfxFloat32(0.5)) k.y = -k.y;
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if (uvw.z > FfxFloat32(0.5)) k.z = -k.z;
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FfxFloat32 fcenter = FfxBrixelizerSampleBrixelDistance(uvw_min, uvw_max, uvw);
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FfxFloat32x3 grad = normalize(
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k.xww * (FfxBrixelizerSampleBrixelDistance(uvw_min, uvw_max, uvw + k.xww * EPS) - fcenter) +
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k.wyw * (FfxBrixelizerSampleBrixelDistance(uvw_min, uvw_max, uvw + k.wyw * EPS) - fcenter) +
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k.wwz * (FfxBrixelizerSampleBrixelDistance(uvw_min, uvw_max, uvw + k.wwz * EPS) - fcenter)
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);
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if (any(isnan(grad))) {
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return normalize(uvw - FFX_BROADCAST_FLOAT32X3(0.5));
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}
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return grad;
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}
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#endif // FFX_BRIXELIZER_BRICK_COMMON_H
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