103 lines
3.3 KiB
C
103 lines
3.3 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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#define TILE_SIZE_X 8
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#define TILE_SIZE_Y 4
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#define k_pushOff 4e-2f
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#define k_tileSize FfxUInt32x2(TILE_SIZE_X, TILE_SIZE_Y)
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//--------------------------------------------------------------------------------------
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// I/O Structures
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//--------------------------------------------------------------------------------------
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struct Tile
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{
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#if FFX_HALF
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FfxUInt16x2 location;
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#else
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FfxUInt32x2 location; // Dead code, f32 not supported
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#endif
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FfxUInt32 mask;
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FfxFloat32 minT;
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FfxFloat32 maxT;
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};
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Tile TileCreate(const FfxUInt32x2 id)
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{
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#if FFX_HALF
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FfxUInt16x2 f16ID = FfxUInt16x2(FfxUInt16(id.x), FfxUInt16(id.y));
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Tile t = { f16ID, 0, k_pushOff, FFX_POSITIVE_INFINITY_FLOAT }; // skyHeight
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#else
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Tile t = { id, 0, k_pushOff, FFX_POSITIVE_INFINITY_FLOAT }; //skyHeight
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#endif
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return t;
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}
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FfxUInt32x4 TileToUint(const Tile t)
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{
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const FfxUInt32x4 ui = FfxUInt32x4((FfxUInt32(t.location.y) << 16) | FfxUInt32(t.location.x), t.mask, ffxAsUInt32(t.minT), ffxAsUInt32(t.maxT));
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return ui;
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}
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Tile TileFromUint(const FfxUInt32x4 ui)
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{
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#if FFX_HALF
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FfxUInt16x2 id = FfxUInt16x2(ui.x & 0xffff, (ui.x >> 16) & 0xffff);
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#else
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FfxUInt32x2 id;
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#endif
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Tile t = { id, ui.y, ffxAsFloat(ui.z), ffxAsFloat(ui.w) };
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return t;
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}
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//--------------------------------------------------------------------------------------
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// helper functions
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//--------------------------------------------------------------------------------------
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FfxUInt32 LaneIdToBitShift(FfxUInt32x2 localID)
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{
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return localID.y * TILE_SIZE_X + localID.x;
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}
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FfxUInt32 BoolToWaveMask(FfxBoolean b, FfxUInt32x2 localID)
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{
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const FfxUInt32 value = FfxUInt32(b) << LaneIdToBitShift(localID);
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return ffxWaveOr(value);
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}
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FfxBoolean WaveMaskToBool(FfxUInt32 mask, FfxUInt32x2 localID)
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{
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return FfxBoolean((FfxUInt32(1) << LaneIdToBitShift(localID)) & mask);
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}
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#define k_pi 3.1415926535897932384f
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#define k_2pi 2.0f * k_pi
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#define k_pi_over_2 0.5f * k_pi
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// made using a modified version of https://www.asawicki.info/news_952_poisson_disc_generator
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#define k_poissonDiscSampleCountLow 8
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#define k_poissonDiscSampleCountMid 16
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#define k_poissonDiscSampleCountHigh 24
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#define k_poissonDiscSampleCountUltra 32
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