416 lines
16 KiB
C++
416 lines
16 KiB
C++
// Copyright (c) Wojciech Figat. All rights reserved.
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#include "ScreenSpaceReflectionsPass.h"
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#include "ReflectionsPass.h"
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#include "GBufferPass.h"
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#include "RenderList.h"
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#include "GlobalSignDistanceFieldPass.h"
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#include "GI/GlobalSurfaceAtlasPass.h"
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#include "Utils/MultiScaler.h"
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#include "Engine/Engine/Engine.h"
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#include "Engine/Platform/Window.h"
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#include "Engine/Content/Content.h"
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#include "Engine/Graphics/Graphics.h"
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#include "Engine/Graphics/RenderTools.h"
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#include "Engine/Graphics/RenderTask.h"
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#include "Engine/Graphics/RenderTargetPool.h"
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#include "Engine/Graphics/RenderBuffers.h"
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#include "Engine/Graphics/GPUContext.h"
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// Shader input texture slots mapping
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#define TEXTURE0 4
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#define TEXTURE1 5
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#define TEXTURE2 6
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#define SSR_USE_HZB 1
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GPU_CB_STRUCT(Data {
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ShaderGBufferData GBuffer;
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float MaxColorMiplevel;
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float TraceSizeMax;
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float MaxTraceSamples;
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float RoughnessFade;
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Float2 SSRTexelSize;
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float TemporalTime;
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float BRDFBias;
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float WorldAntiSelfOcclusionBias;
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float EdgeFadeFactor;
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float TemporalResponse;
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uint32 DepthMips;
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float RayTraceStep;
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float TemporalEffect;
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float Intensity;
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float FadeOutDistance;
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Matrix ViewMatrix;
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Matrix ViewProjectionMatrix;
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GlobalSignDistanceFieldPass::ConstantsData GlobalSDF;
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GlobalSurfaceAtlasPass::ConstantsData GlobalSurfaceAtlas;
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});
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String ScreenSpaceReflectionsPass::ToString() const
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{
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return TEXT("ScreenSpaceReflectionsPass");
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}
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bool ScreenSpaceReflectionsPass::Init()
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{
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// Create pipeline states
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_psRayTracePass.CreatePipelineStates();
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_psResolvePass.CreatePipelineStates();
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_psCombinePass = GPUDevice::Instance->CreatePipelineState();
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_psTemporalPass = GPUDevice::Instance->CreatePipelineState();
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// Load assets
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_shader = Content::LoadAsyncInternal<Shader>(TEXT("Shaders/SSR"));
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_preIntegratedGF = Content::LoadAsyncInternal<Texture>(PRE_INTEGRATED_GF_ASSET_NAME);
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if (_shader == nullptr || _preIntegratedGF == nullptr)
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return true;
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#if COMPILE_WITH_DEV_ENV
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_shader.Get()->OnReloading.Bind<ScreenSpaceReflectionsPass, &ScreenSpaceReflectionsPass::OnShaderReloading>(this);
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#endif
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return false;
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}
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bool ScreenSpaceReflectionsPass::setupResources()
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{
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if (!_preIntegratedGF->IsLoaded())
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return true;
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if (!_shader->IsLoaded())
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return true;
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const auto shader = _shader->GetShader();
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CHECK_INVALID_SHADER_PASS_CB_SIZE(shader, 0, Data);
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// Create pipeline stages
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GPUPipelineState::Description psDesc = GPUPipelineState::Description::DefaultFullscreenTriangle;
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if (!_psRayTracePass.IsValid())
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{
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if (_psRayTracePass.Create(psDesc, shader, "PS_RayTracePass"))
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return true;
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}
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if (!_psCombinePass->IsValid())
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{
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psDesc.PS = shader->GetPS("PS_CombinePass");
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if (_psCombinePass->Init(psDesc))
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return true;
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}
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if (!_psResolvePass.IsValid())
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{
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if (_psResolvePass.Create(psDesc, shader, "PS_ResolvePass"))
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return true;
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}
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if (!_psTemporalPass->IsValid())
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{
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psDesc.PS = shader->GetPS("PS_TemporalPass");
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if (_psTemporalPass->Init(psDesc))
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return true;
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}
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return false;
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}
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void ScreenSpaceReflectionsPass::Dispose()
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{
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// Base
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RendererPass::Dispose();
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// Cleanup
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SAFE_DELETE_GPU_RESOURCE(_psCombinePass);
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SAFE_DELETE_GPU_RESOURCE(_psTemporalPass);
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_psRayTracePass.Delete();
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_psResolvePass.Delete();
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_shader = nullptr;
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_preIntegratedGF = nullptr;
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}
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GPUTexture* ScreenSpaceReflectionsPass::Render(RenderContext& renderContext, GPUTextureView* reflectionsRT, GPUTextureView* lightBuffer)
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{
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// Skip pass if resources aren't ready
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if (checkIfSkipPass())
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return nullptr;
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const RenderView& view = renderContext.View;
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RenderBuffers* buffers = renderContext.Buffers;
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// TODO: add support for SSR in ortho projection
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if (view.IsOrthographicProjection())
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return nullptr;
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PROFILE_GPU_CPU("Screen Space Reflections");
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// Cache data
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auto device = GPUDevice::Instance;
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auto context = device->GetMainContext();
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const auto shader = _shader->GetShader();
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auto cb = shader->GetCB(0);
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auto& settings = renderContext.List->Settings.ScreenSpaceReflections;
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const bool useTemporal = settings.TemporalEffect && !renderContext.Task->IsCameraCut && renderContext.List->Setup.UseMotionVectors;
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// Prepare resolutions for passes
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const int32 width = buffers->GetWidth();
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const int32 height = buffers->GetHeight();
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if (width < 4 || height < 4)
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return nullptr;
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const int32 traceWidth = RenderTools::GetResolution(width, settings.RayTracePassResolution);
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const int32 traceHeight = RenderTools::GetResolution(height, settings.RayTracePassResolution);
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const int32 resolveWidth = RenderTools::GetResolution(width, settings.ResolvePassResolution);
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const int32 resolveHeight = RenderTools::GetResolution(height, settings.ResolvePassResolution);
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const int32 colorBufferWidth = RenderTools::GetResolution(width, ResolutionMode::Half);
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const int32 colorBufferHeight = RenderTools::GetResolution(height, ResolutionMode::Half);
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const auto colorBufferMips = MipLevelsCount(colorBufferWidth, colorBufferHeight);
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// Prepare buffers
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GPUTexture* colorBuffer0, *colorBuffer1;
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if (settings.UseColorBufferMips)
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{
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auto tempDesc = GPUTextureDescription::New2D(colorBufferWidth, colorBufferHeight, 0, PixelFormat::R11G11B10_Float, GPUTextureFlags::ShaderResource | GPUTextureFlags::RenderTarget | GPUTextureFlags::PerMipViews);
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colorBuffer0 = RenderTargetPool::Get(tempDesc);
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RENDER_TARGET_POOL_SET_NAME(colorBuffer0, "SSR.ColorBuffer0");
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// TODO: maybe allocate colorBuffer1 smaller because mip0 is not used (the same as PostProcessingPass for Bloom), keep in sync to use the same buffer in frame
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colorBuffer1 = RenderTargetPool::Get(tempDesc);
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RENDER_TARGET_POOL_SET_NAME(colorBuffer1, "SSR.ColorBuffer1");
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}
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else
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{
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// Single mip
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auto tempDesc = GPUTextureDescription::New2D(colorBufferWidth, colorBufferHeight, 1, PixelFormat::R11G11B10_Float);
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colorBuffer0 = RenderTargetPool::Get(tempDesc);
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colorBuffer1 = nullptr;
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}
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GPUTexture* traceBuffer, *resolveBuffer;
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{
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auto tempDesc = GPUTextureDescription::New2D(traceWidth, traceHeight, PixelFormat::R16G16B16A16_Float);
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traceBuffer = RenderTargetPool::Get(tempDesc);
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RENDER_TARGET_POOL_SET_NAME(traceBuffer, "SSR.TraceBuffer");
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tempDesc.Width = resolveWidth;
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tempDesc.Height = resolveHeight;
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resolveBuffer = RenderTargetPool::Get(tempDesc);
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RENDER_TARGET_POOL_SET_NAME(resolveBuffer, "SSR.ResolveBuffer");
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}
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// Pick effect settings
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int32 maxTraceSamples = 60;
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int32 resolveSamples = settings.ResolveSamples;
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switch (Graphics::SSRQuality)
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{
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case Quality::Low:
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maxTraceSamples = 40;
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resolveSamples = Math::Min(resolveSamples, 2);
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break;
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case Quality::Medium:
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maxTraceSamples = 55;
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resolveSamples = Math::Min(resolveSamples, 4);
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break;
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case Quality::High:
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maxTraceSamples = 70;
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break;
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case Quality::Ultra:
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maxTraceSamples = 120;
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break;
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}
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int32 resolvePassIndex = 0;
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if (resolveSamples >= 8)
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resolvePassIndex = 3;
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else if (resolveSamples >= 4)
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resolvePassIndex = 2;
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else if (resolveSamples >= 2)
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resolvePassIndex = 1;
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// Setup data
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Data data;
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GBufferPass::SetInputs(view, data.GBuffer);
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data.RoughnessFade = Math::Saturate(settings.RoughnessThreshold);
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data.MaxTraceSamples = static_cast<float>(maxTraceSamples);
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data.BRDFBias = settings.BRDFBias;
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data.WorldAntiSelfOcclusionBias = settings.WorldAntiSelfOcclusionBias * (int32)settings.DepthResolution;
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data.EdgeFadeFactor = settings.EdgeFadeFactor;
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data.SSRTexelSize = Float2(1.0f / (float)traceWidth, 1.0f / (float)traceHeight);
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data.TraceSizeMax = (float)Math::Max(traceWidth, traceHeight);
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data.MaxColorMiplevel = settings.UseColorBufferMips ? (float)(colorBufferMips - 2) : 0.0f;
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data.RayTraceStep = (float)settings.DepthResolution / (float)width;
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data.Intensity = settings.Intensity;
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data.FadeOutDistance = Math::Max(settings.FadeOutDistance, 100.0f);
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data.TemporalResponse = settings.TemporalResponse;
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data.TemporalEffect = useTemporal ? 1.0f : 0.0f;
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data.TemporalTime = useTemporal ? RenderTools::ComputeTemporalTime() : 0;
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Matrix::Transpose(view.View, data.ViewMatrix);
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Matrix::Transpose(view.ViewProjection(), data.ViewProjectionMatrix);
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// Try to use Global Surface Atlas (with rendered GI) to perform full-scene tracing (not only screen-space)
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bool useGlobalSurfaceAtlas = false;
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GlobalSignDistanceFieldPass::BindingData bindingDataSDF;
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GlobalSurfaceAtlasPass::BindingData bindingDataSurfaceAtlas;
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if (settings.TraceMode == ReflectionsTraceMode::SoftwareTracing &&
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EnumHasAnyFlags(view.Flags, ViewFlags::GI) &&
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renderContext.List->Settings.GlobalIllumination.Mode == GlobalIlluminationMode::DDGI)
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{
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if (!GlobalSignDistanceFieldPass::Instance()->Render(renderContext, context, bindingDataSDF) &&
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!GlobalSurfaceAtlasPass::Instance()->Render(renderContext, context, bindingDataSurfaceAtlas))
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{
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useGlobalSurfaceAtlas = true;
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data.GlobalSDF = bindingDataSDF.Constants;
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data.GlobalSurfaceAtlas = bindingDataSurfaceAtlas.Constants;
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}
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}
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// Prepare depth buffer
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#if SSR_USE_HZB
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int32 hzbMips = settings.DepthResolution == ResolutionMode::Full ? 5 : 4; // Using lower mips in tracing introduces blocky artifacts
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bool hzbFullRes = settings.DepthResolution == ResolutionMode::Full;
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GPUTexture* depthBufferTrace = buffers->RequestHiZ(context, hzbFullRes, hzbMips);
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data.DepthMips = hzbMips - 1; // Offset to improve SSR range
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#else
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GPUTexture* depthBufferTrace = settings.DepthResolution == ResolutionMode::Half ? buffers->RequestHalfResDepth(context) : buffers->DepthBuffer;
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data.DepthMips = 1;
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#endif
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if (depthBufferTrace == nullptr)
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{
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RenderTargetPool::Release(colorBuffer0);
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RenderTargetPool::Release(colorBuffer1);
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RenderTargetPool::Release(traceBuffer);
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RenderTargetPool::Release(resolveBuffer);
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return nullptr;
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}
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// Prepare constants
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context->UpdateCB(cb, &data);
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context->BindCB(0, cb);
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// Bind GBuffer inputs
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context->BindSR(0, buffers->GBuffer0);
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context->BindSR(1, buffers->GBuffer1);
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context->BindSR(2, buffers->GBuffer2);
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context->BindSR(3, depthBufferTrace);
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// Combine pass
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{
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PROFILE_GPU("Combine");
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context->BindSR(TEXTURE0, lightBuffer);
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context->BindSR(TEXTURE1, reflectionsRT);
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context->BindSR(TEXTURE2, _preIntegratedGF->GetTexture());
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context->SetViewportAndScissors((float)colorBufferWidth, (float)colorBufferHeight);
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context->SetRenderTarget(colorBuffer0->View(0));
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context->SetState(_psCombinePass);
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context->DrawFullscreenTriangle();
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context->UnBindSR(TEXTURE1);
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context->UnBindSR(TEXTURE2);
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context->ResetRenderTarget();
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}
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// Blur Pass
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if (settings.UseColorBufferMips)
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{
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// Note: using color buffer mips maps helps with reducing artifacts
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// and improves resolve pass performance (faster color texture lookups, less cache misses)
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// Also for high surface roughness values it adds more blur to the reflection tail which looks more realistic.
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// Downscale with gaussian blur
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auto filterMode = PLATFORM_ANDROID || PLATFORM_IOS || PLATFORM_SWITCH ? MultiScaler::FilterMode::GaussianBlur5 : MultiScaler::FilterMode::GaussianBlur9;
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for (int32 mipLevel = 1; mipLevel < colorBufferMips; mipLevel++)
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{
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const int32 mipWidth = Math::Max(colorBufferWidth >> mipLevel, 1);
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const int32 mipHeight = Math::Max(colorBufferHeight >> mipLevel, 1);
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const auto srcMip = colorBuffer0->View(0, mipLevel - 1);
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const auto tmpMip = colorBuffer1->View(0, mipLevel);
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const auto dstMip = colorBuffer0->View(0, mipLevel);
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MultiScaler::Instance()->Filter(filterMode, context, mipWidth, mipHeight, srcMip, dstMip, tmpMip);
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}
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// Restore state
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context->BindCB(0, cb);
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context->BindSR(0, buffers->GBuffer0);
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}
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RenderTargetPool::Release(colorBuffer1);
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// Ray Trace Pass
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{
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PROFILE_GPU("RayTrace");
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context->SetViewportAndScissors((float)traceWidth, (float)traceHeight);
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context->SetRenderTarget(*traceBuffer);
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context->BindSR(TEXTURE0, colorBuffer0->View());
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if (useGlobalSurfaceAtlas)
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{
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context->BindSR(7, bindingDataSDF.Texture ? bindingDataSDF.Texture->ViewVolume() : nullptr);
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context->BindSR(8, bindingDataSDF.TextureMip ? bindingDataSDF.TextureMip->ViewVolume() : nullptr);
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context->BindSR(9, bindingDataSurfaceAtlas.Chunks ? bindingDataSurfaceAtlas.Chunks->View() : nullptr);
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context->BindSR(10, bindingDataSurfaceAtlas.CulledObjects ? bindingDataSurfaceAtlas.CulledObjects->View() : nullptr);
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context->BindSR(11, bindingDataSurfaceAtlas.Objects ? bindingDataSurfaceAtlas.Objects->View() : nullptr);
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context->BindSR(12, bindingDataSurfaceAtlas.AtlasDepth->View());
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context->BindSR(13, bindingDataSurfaceAtlas.AtlasLighting->View());
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}
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context->SetState(_psRayTracePass.Get(useGlobalSurfaceAtlas ? 1 : 0));
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context->DrawFullscreenTriangle();
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context->ResetRenderTarget();
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RenderTargetPool::Release(colorBuffer0);
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}
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// Resolve Pass
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{
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PROFILE_GPU("Resolve");
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context->SetViewportAndScissors((float)resolveWidth, (float)resolveHeight);
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context->SetRenderTarget(resolveBuffer->View());
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context->BindSR(TEXTURE0, traceBuffer->View());
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context->SetState(_psResolvePass.Get(resolvePassIndex));
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context->DrawFullscreenTriangle();
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context->ResetRenderTarget();
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RenderTargetPool::Release(traceBuffer);
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}
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// Temporal Pass
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GPUTexture* reflectionsBuffer = resolveBuffer;
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if (useTemporal)
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{
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PROFILE_GPU("Temporal");
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buffers->LastFrameTemporalSSR = Engine::FrameCount;
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bool resetHistory = false;
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if (!buffers->TemporalSSR || buffers->TemporalSSR->Width() != resolveWidth || buffers->TemporalSSR->Height() != resolveHeight)
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{
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resetHistory = true;
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if (buffers->TemporalSSR)
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RenderTargetPool::Release(buffers->TemporalSSR);
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auto tempDesc = GPUTextureDescription::New2D(resolveWidth, resolveHeight, PixelFormat::R16G16B16A16_Float);
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buffers->TemporalSSR = RenderTargetPool::Get(tempDesc);
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RENDER_TARGET_POOL_SET_NAME(buffers->TemporalSSR, "SSR.TemporalSSR");
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}
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auto newTemporal = RenderTargetPool::Get(buffers->TemporalSSR->GetDescription());
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RENDER_TARGET_POOL_SET_NAME(newTemporal, "SSR.TemporalSSR");
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if (resetHistory)
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{
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context->Draw(newTemporal, resolveBuffer);
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}
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else
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{
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context->SetRenderTarget(newTemporal->View());
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context->BindSR(TEXTURE0, resolveBuffer);
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context->BindSR(TEXTURE1, buffers->TemporalSSR);
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context->BindSR(TEXTURE2, buffers->MotionVectors && buffers->MotionVectors->IsAllocated() ? buffers->MotionVectors->View() : nullptr);
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context->SetState(_psTemporalPass);
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context->DrawFullscreenTriangle();
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}
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context->ResetRenderTarget();
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context->UnBindSR(TEXTURE1);
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context->UnBindSR(TEXTURE2);
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RenderTargetPool::Release(resolveBuffer);
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context->CopyResource(buffers->TemporalSSR, newTemporal);
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reflectionsBuffer = newTemporal;
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}
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return reflectionsBuffer;
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}
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#if COMPILE_WITH_DEV_ENV
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void ScreenSpaceReflectionsPass::OnShaderReloading(Asset* obj)
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{
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_psCombinePass->ReleaseGPU();
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_psTemporalPass->ReleaseGPU();
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_psRayTracePass.Release();
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_psResolvePass.Release();
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invalidateResources();
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}
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#endif
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