Adi Bar-Lev
64bbc700fa
- This rendering technique reduces the memory required per pipeline by 750MB compared to the PPLL technique!! - Using 3 screen buffers representing the closest 3 hair gragments depths. - Going through second geometry pass that disqualify any fragment further than the third depth, the technique blends the three closes shaders hair fragments. - Supports the Marschner lighting model (big change from the original TressFX 4.1 implementation) - The current technique is almost twice the performance of the PPLL but not quite as advacned when come to final visual quality. Remarks: Unlike the PPLL, this technique is still lacking some of the advanced features added to the PPLL such as 1. Back lobe (TT) conseal by depth comparison 2. Thickness dependency in light transfer (mainly TT) 3. Allowing TT transfer for thin separated hair strands (might be supported by default with no distinction) Signed-off-by: Adi-Amazon <Adi Bar-Lev 82479970+Adi-Amazon@users.noreply.github.com> Signed-off-by: Adi-Amazon <Adi Bar-Lev barlev@amazon.com> Signed-off-by: Adi-Amazon <Adi Bar-Lev 82479970+Adi-Amazon@users.noreply.github.com> Signed-off-by: Adi-Amazon <Adi Bar-Lev barlev@amazon.com> Co-authored-by: Adi-Amazon <Adi Bar-Lev 82479970+Adi-Amazon@users.noreply.github.com>
66 lines
3.1 KiB
Plaintext
66 lines
3.1 KiB
Plaintext
/*
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* Modifications Copyright (c) Contributors to the Open 3D Engine Project.
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* For complete copyright and license terms please see the LICENSE at the root of this distribution.
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*
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* SPDX-License-Identifier: (Apache-2.0 OR MIT) AND MIT
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*
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*/
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//
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// Copyright (c) 2019 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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//
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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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//
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#include <Atom/Features/SrgSemantics.azsli>
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//!------------------------------ SRG Structure --------------------------------
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//! Per pass SRG that holds the dynamic shared read-write buffer shared
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//! across all dispatches and draw calls. It is used for all the dynamic buffers
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//! that can change between passes due to the application of skinning, simulation
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//! and physics affect.
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//! Once the compute pases are done, it is read by the rendering shaders.
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ShaderResourceGroup PassSrg : SRG_PerPass_WithFallback
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{
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// Originally: [[vk::binding(0, 0)]] Texture2DArray<uint> FragmentDepthsTexture : register(t0, space0);
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Texture2DArray<uint> m_fragmentDepthsTexture;
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}
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//------------------------------------------------------------------------------
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#include <HairFullScreenUtils.azsli> // provides the Vertex Shader
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//!=============================================================================
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//! Resolve Depth - Second Pass of ShortCut
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//! Full-screen pass that writes the farthest of the stored K near depths so it
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//! could be used for depth culling during the following geometry shading pass.
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//!=============================================================================
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float HairShortCutResolveDepthPS(VSOutput input) : SV_Depth
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{
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// Blend the layers of fragments from back to front
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int2 vScreenAddress = int2(input.m_position.xy);
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// Write farthest depth value for culling in the next pass.
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// It may be the initial value of 1.0 if there were not enough fragments to write all depths, but then culling not important.
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const int farthestDepthIndex = 2;
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uint uDepth = PassSrg::m_fragmentDepthsTexture[uint3(vScreenAddress, farthestDepthIndex)];
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// The following line is writing the depth into the actual depth buffer
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return asfloat(uDepth);
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}
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