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Avoid building the mip chain a second time for SSR for transparent objects. #93

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Merged
merged 5 commits into from
Apr 18, 2020
Merged

Avoid building the mip chain a second time for SSR for transparent objects. #93

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fb10832
- Avoid building the mip chain a second time for SSR for transparent …
anisunity Mar 26, 2020
5d22450
Update ScreenSpaceReflections.compute
sebastienlagarde Apr 18, 2020
8871ab4
Merge branch 'HDRP/staging' into HDRP/NoMipSSRTransparent
sebastienlagarde Apr 18, 2020
a270757
Merge branch 'HDRP/NoMipSSRTransparent' of https://github.com/Unity-T…
sebastienlagarde Apr 18, 2020
80e3009
fix merge issue
sebastienlagarde Apr 18, 2020
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1 change: 1 addition & 0 deletions com.unity.render-pipelines.high-definition/CHANGELOG.md
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Expand Up @@ -661,6 +661,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
- Raytracing: Removed the dynamic lightmap multicompile.
- Raytracing: Remove the LOD cross fade multi compile for ray tracing.
- Cookie are now supported in lightmaper. All lights casting cookie and baked will now include cookie influence.
- Avoid building the mip chain a second time for SSR for transparent objects.

## [7.1.1] - 2019-09-05

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21 changes: 21 additions & 0 deletions ...lines.high-definition/Runtime/Lighting/ScreenSpaceLighting/ScreenSpaceReflections.compute
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Expand Up @@ -8,6 +8,8 @@
#pragma kernel ScreenSpaceReflectionsTracing SSR_TRACE
#pragma kernel ScreenSpaceReflectionsReprojection SSR_REPROJECT

#pragma multi_compile _ DEPTH_SOURCE_NOT_FROM_MIP_CHAIN

// Tweak parameters.
// #define DEBUG
#define SSR_TRACE_BEHIND_OBJECTS
Expand Down Expand Up @@ -41,6 +43,20 @@
RW_TEXTURE2D(float4, _SsrDebugTexture);
#endif

// For opaque we do the following operation:
// - Render opaque object in depth buffer
// - Generate depth pyramid from opaque depth buffer
// - Trigger ray from position recover from depth pyramid and raymarch with depth pyramid
// For transparent reflection we chose to not regenerate a depth pyramid to save performance. So we have
// - Generate depth pyramid from opaque depth buffer
// - Trigger ray from position recover from depth buffer (use depth pyramid) and raymarch with depth pyramid
// - Render transparent object with reflection in depth buffer in transparent prepass
// - Trigger ray from position recover from new depth buffer and raymarch with opaque depth pyramid
// So we need a seperate texture for the mip chain and for the depth source when doing the transprent reflection
#ifdef DEPTH_SOURCE_NOT_FROM_MIP_CHAIN
TEXTURE2D_X(_DepthTexture);
#endif

#ifdef SSR_TRACE
TEXTURE2D_X_UINT2( _StencilTexture);
RW_TEXTURE2D_X(float2, _SsrHitPointTexture);
Expand Down Expand Up @@ -104,7 +120,12 @@ void ScreenSpaceReflectionsTracing(uint3 groupId : SV_GroupID,
}

float2 positionNDC = positionSS * _ScreenSize.zw + (0.5 * _ScreenSize.zw); // Should we precompute the half-texel bias? We seem to use it a lot.

#ifdef DEPTH_SOURCE_NOT_FROM_MIP_CHAIN
float deviceDepth = LOAD_TEXTURE2D_X(_DepthTexture, positionSS).r;
#else
float deviceDepth = LOAD_TEXTURE2D_X(_CameraDepthTexture, positionSS).r;
#endif

bool killRay = deviceDepth == UNITY_RAW_FAR_CLIP_VALUE;

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6 changes: 5 additions & 1 deletion ...ity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.LightLoop.cs
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Expand Up @@ -244,6 +244,7 @@ LightingOutput RenderDeferredLighting( RenderGraph renderGraph,
class RenderSSRPassData
{
public RenderSSRParameters parameters;
public TextureHandle depthBuffer;
public TextureHandle depthPyramid;
public TextureHandle colorPyramid;
public TextureHandle stencilBuffer;
Expand All @@ -257,6 +258,7 @@ TextureHandle RenderSSR( RenderGraph renderGraph,
HDCamera hdCamera,
TextureHandle normalBuffer,
TextureHandle motionVectorsBuffer,
TextureHandle depthBuffer,
TextureHandle depthPyramid,
TextureHandle stencilBuffer,
TextureHandle clearCoatMask)
Expand Down Expand Up @@ -285,7 +287,8 @@ TextureHandle RenderSSR( RenderGraph renderGraph,

var colorPyramid = renderGraph.ImportTexture(hdCamera.GetPreviousFrameRT((int)HDCameraFrameHistoryType.ColorBufferMipChain));

passData.parameters = PrepareSSRParameters(hdCamera, m_DepthBufferMipChainInfo);
passData.parameters = PrepareSSRParameters(hdCamera, m_DepthBufferMipChainInfo, true);
passData.depthBuffer = builder.ReadTexture(depthBuffer);
passData.depthPyramid = builder.ReadTexture(depthPyramid);
passData.colorPyramid = builder.ReadTexture(colorPyramid);
passData.stencilBuffer = builder.ReadTexture(stencilBuffer);
Expand All @@ -308,6 +311,7 @@ TextureHandle RenderSSR( RenderGraph renderGraph,
{
var res = context.resources;
RenderSSR(data.parameters,
res.GetTexture(data.depthBuffer),
res.GetTexture(data.depthPyramid),
res.GetTexture(data.hitPointsTexture),
res.GetTexture(data.stencilBuffer),
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1 change: 1 addition & 0 deletions ...y.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.RenderGraph.cs
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Expand Up @@ -75,6 +75,7 @@ void ExecuteWithRenderGraph( RenderRequest renderRequest,
hdCamera,
prepassOutput.resolvedNormalBuffer,
prepassOutput.resolvedMotionVectorsBuffer,
prepassOutput.depthBuffer,
prepassOutput.depthPyramidTexture,
prepassOutput.stencilBuffer,
clearCoatMask);
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26 changes: 17 additions & 9 deletions com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.cs
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Expand Up @@ -3878,6 +3878,7 @@ struct RenderSSRParameters
public ComputeShader ssrCS;
public int tracingKernel;
public int reprojectionKernel;
public bool transparentSSR;

public int width, height, viewCount;

Expand All @@ -3887,14 +3888,15 @@ struct RenderSSRParameters
public ShaderVariablesScreenSpaceReflection cb;
}

RenderSSRParameters PrepareSSRParameters(HDCamera hdCamera, in HDUtils.PackedMipChainInfo depthPyramid)
RenderSSRParameters PrepareSSRParameters(HDCamera hdCamera, in HDUtils.PackedMipChainInfo depthPyramid, bool transparentSSR)
{
var volumeSettings = hdCamera.volumeStack.GetComponent<ScreenSpaceReflection>();
var parameters = new RenderSSRParameters();

parameters.ssrCS = m_ScreenSpaceReflectionsCS;
parameters.tracingKernel = m_SsrTracingKernel;
parameters.reprojectionKernel = m_SsrReprojectionKernel;
parameters.transparentSSR = transparentSSR;

parameters.width = hdCamera.actualWidth;
parameters.height = hdCamera.actualHeight;
Expand Down Expand Up @@ -3927,6 +3929,7 @@ RenderSSRParameters PrepareSSRParameters(HDCamera hdCamera, in HDUtils.PackedMip
}

static void RenderSSR( in RenderSSRParameters parameters,
RTHandle depthTexture,
RTHandle depthPyramid,
RTHandle SsrHitPointTexture,
RTHandle stencilBuffer,
Expand All @@ -3941,6 +3944,12 @@ static void RenderSSR( in RenderSSRParameters parameters,
using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.SsrTracing)))
{
// cmd.SetComputeTextureParam(cs, kernel, "_SsrDebugTexture", m_SsrDebugTexture);
// Bind the non mip chain if we are rendering the transaprent version
if (parameters.transparentSSR)
{
CoreUtils.SetKeyword(cmd, "DEPTH_SOURCE_NOT_FROM_MIP_CHAIN", true);
cmd.SetComputeTextureParam(cs, parameters.tracingKernel, HDShaderIDs._DepthTexture, depthTexture);
}
cmd.SetComputeTextureParam(cs, parameters.tracingKernel, HDShaderIDs._CameraDepthTexture, depthPyramid);
cmd.SetComputeTextureParam(cs, parameters.tracingKernel, HDShaderIDs._SsrClearCoatMaskTexture, clearCoatMask);
cmd.SetComputeTextureParam(cs, parameters.tracingKernel, HDShaderIDs._SsrHitPointTexture, SsrHitPointTexture);
Expand All @@ -3960,6 +3969,9 @@ static void RenderSSR( in RenderSSRParameters parameters,
ConstantBuffer.Push(cmd, parameters.cb, cs, HDShaderIDs._ShaderVariablesScreenSpaceReflection);

cmd.DispatchCompute(cs, parameters.tracingKernel, HDUtils.DivRoundUp(parameters.width, 8), HDUtils.DivRoundUp(parameters.height, 8), parameters.viewCount);

if (parameters.transparentSSR)
CoreUtils.SetKeyword(cmd, "DEPTH_SOURCE_NOT_FROM_MIP_CHAIN", false);
}

using (new ProfilingScope(cmd, ProfilingSampler.Get(HDProfileId.SsrReprojection)))
Expand Down Expand Up @@ -3997,8 +4009,8 @@ void RenderSSR(HDCamera hdCamera, CommandBuffer cmd, ScriptableRenderContext ren
// Evaluate the clear coat mask texture based on the lit shader mode
RTHandle clearCoatMask = hdCamera.frameSettings.litShaderMode == LitShaderMode.Deferred ? m_GbufferManager.GetBuffer(2) : TextureXR.GetBlackTexture();

var parameters = PrepareSSRParameters(hdCamera, m_SharedRTManager.GetDepthBufferMipChainInfo());
RenderSSR(parameters, m_SharedRTManager.GetDepthTexture(), m_SsrHitPointTexture,
var parameters = PrepareSSRParameters(hdCamera, m_SharedRTManager.GetDepthBufferMipChainInfo(), false);
RenderSSR(parameters, m_SharedRTManager.GetDepthStencilBuffer(), m_SharedRTManager.GetDepthTexture(), m_SsrHitPointTexture,
m_SharedRTManager.GetStencilBuffer(hdCamera.frameSettings.IsEnabled(FrameSettingsField.MSAA)), clearCoatMask, previousColorPyramid,
m_SsrLightingTexture, cmd, renderContext);

Expand Down Expand Up @@ -4027,16 +4039,12 @@ void RenderSSRTransparent(HDCamera hdCamera, CommandBuffer cmd, ScriptableRender
// Clear the SSR lighting buffer (not sure it is required)
CoreUtils.SetRenderTarget(cmd, m_SsrLightingTexture, ClearFlag.Color, Color.clear);
CoreUtils.SetRenderTarget(cmd, m_SsrHitPointTexture, ClearFlag.Color, Color.clear);

// Invalid the depth pyramid and regenerate the depth pyramid
m_IsDepthBufferCopyValid = false;
GenerateDepthPyramid(hdCamera, cmd, FullScreenDebugMode.DepthPyramid);
}

// Evaluate the screen space reflection for the transparent pixels
var previousColorPyramid = hdCamera.GetPreviousFrameRT((int)HDCameraFrameHistoryType.ColorBufferMipChain);
var parameters = PrepareSSRParameters(hdCamera, m_SharedRTManager.GetDepthBufferMipChainInfo());
RenderSSR(parameters, m_SharedRTManager.GetDepthTexture(), m_SsrHitPointTexture, m_SharedRTManager.GetStencilBuffer(), TextureXR.GetBlackTexture(), previousColorPyramid, m_SsrLightingTexture, cmd, renderContext);
var parameters = PrepareSSRParameters(hdCamera, m_SharedRTManager.GetDepthBufferMipChainInfo(), true);
RenderSSR(parameters, m_SharedRTManager.GetDepthStencilBuffer(), m_SharedRTManager.GetDepthTexture(), m_SsrHitPointTexture, m_SharedRTManager.GetStencilBuffer(), TextureXR.GetBlackTexture(), previousColorPyramid, m_SsrLightingTexture, cmd, renderContext);

// If color pyramid was not valid, we bind a black texture
if (!hdCamera.colorPyramidHistoryIsValid)
Expand Down