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260 行
16 KiB

using UnityEngine.Rendering;
using System;
namespace UnityEngine.Experimental.Rendering.HDPipeline
{
public class SubsurfaceScatteringManager
{
// Currently we only support SSSBuffer with one buffer. If the shader code change, it may require to update the shader manager
public const int k_MaxSSSBuffer = 1;
readonly int m_SSSBuffer0;
readonly RenderTargetIdentifier m_SSSBuffer0RT;
public int sssBufferCount { get { return k_MaxSSSBuffer; } }
RenderTargetIdentifier[] m_ColorMRTs;
RenderTargetIdentifier[] m_RTIDs = new RenderTargetIdentifier[k_MaxSSSBuffer];
// Disney SSS Model
ComputeShader m_SubsurfaceScatteringCS;
int m_SubsurfaceScatteringKernel;
Material m_CombineLightingPass;
RenderTexture m_HTile;
RenderTargetIdentifier m_HTileRT;
// End Disney SSS Model
// Jimenez SSS Model
Material m_SssVerticalFilterPass;
Material m_SssHorizontalFilterAndCombinePass;
// End Jimenez SSS Model
// Jimenez need an extra buffer and Disney need one for some platform
readonly int m_CameraFilteringBuffer;
readonly RenderTargetIdentifier m_CameraFilteringBufferRT;
// This is use to be able to read stencil value in compute shader
Material m_CopyStencilForSplitLighting;
public SubsurfaceScatteringManager()
{
m_SSSBuffer0 = HDShaderIDs._SSSBufferTexture[0];
m_SSSBuffer0RT = new RenderTargetIdentifier(m_SSSBuffer0);
// Use with Jimenez
m_CameraFilteringBuffer = HDShaderIDs._CameraFilteringBuffer;
m_CameraFilteringBufferRT = new RenderTargetIdentifier(m_CameraFilteringBuffer);
}
// In case of deferred, we must be in sync with SubsurfaceScattering.hlsl and lit.hlsl files and setup the correct buffers
// for SSS
public void InitSSSBuffersFromGBuffer(GBufferManager gbufferManager)
{
m_RTIDs[0] = gbufferManager.GetGBuffers()[0]; // Note: This buffer must be sRGB (which is the case with Lit.shader)
}
// In case of full forward we must allocate the render target for forward SSS (or reuse one already existing)
// TODO: Provide a way to reuse a render target
public void InitSSSBuffers(RenderTextureDescriptor desc, CommandBuffer cmd)
{
m_RTIDs[0] = m_SSSBuffer0RT;
desc.depthBufferBits = 0;
desc.colorFormat = RenderTextureFormat.ARGB32;
desc.sRGB = true; // Note: This buffer must be sRGB to match deferred case (which is the case with Lit.shader)
cmd.ReleaseTemporaryRT(m_SSSBuffer0);
cmd.GetTemporaryRT(m_SSSBuffer0, desc, FilterMode.Point);
}
public RenderTargetIdentifier GetSSSBuffers(int index)
{
Debug.Assert(index < sssBufferCount);
return m_RTIDs[index];
}
public void Build(HDRenderPipelineAsset hdAsset)
{
// Disney SSS (compute + combine)
m_SubsurfaceScatteringCS = hdAsset.renderPipelineResources.subsurfaceScatteringCS;
m_SubsurfaceScatteringKernel = m_SubsurfaceScatteringCS.FindKernel("SubsurfaceScattering");
m_CombineLightingPass = CoreUtils.CreateEngineMaterial(hdAsset.renderPipelineResources.combineLighting);
m_CombineLightingPass.SetInt(HDShaderIDs._StencilMask, (int)HDRenderPipeline.StencilBitMask.LightingMask);
// Jimenez SSS Model (shader)
m_SssVerticalFilterPass = CoreUtils.CreateEngineMaterial(hdAsset.renderPipelineResources.subsurfaceScattering);
m_SssVerticalFilterPass.DisableKeyword("SSS_FILTER_HORIZONTAL_AND_COMBINE");
m_SssVerticalFilterPass.SetFloat(HDShaderIDs._DstBlend, (float)BlendMode.Zero);
m_SssHorizontalFilterAndCombinePass = CoreUtils.CreateEngineMaterial(hdAsset.renderPipelineResources.subsurfaceScattering);
m_SssHorizontalFilterAndCombinePass.EnableKeyword("SSS_FILTER_HORIZONTAL_AND_COMBINE");
m_SssHorizontalFilterAndCombinePass.SetFloat(HDShaderIDs._DstBlend, (float)BlendMode.One);
m_CopyStencilForSplitLighting = CoreUtils.CreateEngineMaterial(hdAsset.renderPipelineResources.copyStencilBuffer);
m_CopyStencilForSplitLighting.SetInt(HDShaderIDs._StencilRef, (int)StencilLightingUsage.SplitLighting);
m_CopyStencilForSplitLighting.SetInt(HDShaderIDs._StencilMask, (int)HDRenderPipeline.StencilBitMask.LightingMask);
}
public void Cleanup()
{
CoreUtils.Destroy(m_CombineLightingPass);
CoreUtils.Destroy(m_SssVerticalFilterPass);
CoreUtils.Destroy(m_SssHorizontalFilterAndCombinePass);
CoreUtils.Destroy(m_CopyStencilForSplitLighting);
}
public void Resize(HDCamera hdCamera)
{
// We must use a RenderTexture and not GetTemporaryRT() as currently Unity only aloow to bind a RenderTexture for a UAV in a pixel shader
// We use 8x8 tiles in order to match the native GCN HTile as closely as possible.
var desc = hdCamera.renderTextureDesc;
desc.width = (desc.width + 7) / 8;
desc.height = (desc.height + 7) / 8;
m_HTile = CoreUtils.CreateRenderTexture(desc, 0, RenderTextureFormat.R8, RenderTextureReadWrite.Linear); // DXGI_FORMAT_R8_UINT is not supported by Unity
m_HTile.filterMode = FilterMode.Point;
m_HTile.enableRandomWrite = true;
m_HTile.Create();
m_HTileRT = new RenderTargetIdentifier(m_HTile);
}
public void PushGlobalParams(CommandBuffer cmd, DiffusionProfileSettings sssParameters, FrameSettings frameSettings)
{
// Broadcast SSS parameters to all shaders.
cmd.SetGlobalInt(HDShaderIDs._EnableSubsurfaceScattering, frameSettings.enableSubsurfaceScattering ? 1 : 0);
unsafe
{
// Warning: Unity is not able to losslessly transfer integers larger than 2^24 to the shader system.
// Therefore, we bitcast uint to float in C#, and bitcast back to uint in the shader.
uint texturingModeFlags = sssParameters.texturingModeFlags;
uint transmissionFlags = sssParameters.transmissionFlags;
cmd.SetGlobalFloat(HDShaderIDs._TexturingModeFlags, *(float*)&texturingModeFlags);
cmd.SetGlobalFloat(HDShaderIDs._TransmissionFlags, *(float*)&transmissionFlags);
}
cmd.SetGlobalVectorArray(HDShaderIDs._ThicknessRemaps, sssParameters.thicknessRemaps);
cmd.SetGlobalVectorArray(HDShaderIDs._ShapeParams, sssParameters.shapeParams);
cmd.SetGlobalVectorArray(HDShaderIDs._HalfRcpVariancesAndWeights, sssParameters.halfRcpVariancesAndWeights);
// To disable transmission, we simply nullify the transmissionTint
cmd.SetGlobalVectorArray(HDShaderIDs._TransmissionTintsAndFresnel0, frameSettings.enableTransmission ? sssParameters.transmissionTintsAndFresnel0 : sssParameters.disabledTransmissionTintsAndFresnel0);
cmd.SetGlobalVectorArray(HDShaderIDs._WorldScales, sssParameters.worldScales);
}
bool NeedTemporarySubsurfaceBuffer()
{
// Caution: need to be in sync with SubsurfaceScattering.cs USE_INTERMEDIATE_BUFFER (Can't make a keyword as it is a compute shader)
// Typed UAV loads from FORMAT_R16G16B16A16_FLOAT is an optional feature of Direct3D 11.
// Most modern GPUs support it. We can avoid performing a costly copy in this case.
// TODO: test/implement for other platforms.
return SystemInfo.graphicsDeviceType != GraphicsDeviceType.PlayStation4 &&
SystemInfo.graphicsDeviceType != GraphicsDeviceType.XboxOne &&
SystemInfo.graphicsDeviceType != GraphicsDeviceType.XboxOneD3D12;
}
// Combines specular lighting and diffuse lighting with subsurface scattering.
public void SubsurfaceScatteringPass(HDCamera hdCamera, CommandBuffer cmd, DiffusionProfileSettings sssParameters, FrameSettings frameSettings,
RenderTargetIdentifier colorBufferRT, RenderTargetIdentifier diffuseBufferRT, RenderTargetIdentifier depthStencilBufferRT, RenderTargetIdentifier depthTextureRT)
{
if (sssParameters == null || !frameSettings.enableSubsurfaceScattering)
return;
using (new ProfilingSample(cmd, "Subsurface Scattering", HDRenderPipeline.GetSampler(CustomSamplerId.SubsurfaceScattering)))
{
// For Jimenez we always need an extra buffer, for Disney it depends on platform
if (ShaderConfig.k_UseDisneySSS == 0 || NeedTemporarySubsurfaceBuffer())
{
// Caution: must be same format as m_CameraSssDiffuseLightingBuffer
cmd.ReleaseTemporaryRT(m_CameraFilteringBuffer);
CoreUtils.CreateCmdTemporaryRT(cmd, m_CameraFilteringBuffer, hdCamera.renderTextureDesc, 0, FilterMode.Point, RenderTextureFormat.RGB111110Float, RenderTextureReadWrite.Linear, 1, true); // Enable UAV
// Clear the SSS filtering target
using (new ProfilingSample(cmd, "Clear SSS filtering target", HDRenderPipeline.GetSampler(CustomSamplerId.ClearSSSFilteringTarget)))
{
CoreUtils.SetRenderTarget(cmd, m_CameraFilteringBufferRT, ClearFlag.Color, CoreUtils.clearColorAllBlack);
}
}
if (ShaderConfig.s_UseDisneySSS == 1) // use static here to quiet the compiler warning
{
using (new ProfilingSample(cmd, "HTile for SSS", HDRenderPipeline.GetSampler(CustomSamplerId.HTileForSSS)))
{
// Currently, Unity does not offer a way to access the GCN HTile even on PS4 and Xbox One.
// Therefore, it's computed in a pixel shader, and optimized to only contain the SSS bit.
CoreUtils.SetRenderTarget(cmd, m_HTileRT, ClearFlag.Color, CoreUtils.clearColorAllBlack);
cmd.SetRandomWriteTarget(1, m_HTile);
// Generate HTile for the split lighting stencil usage. Don't write into stencil texture (shaderPassId = 2)
// Use ShaderPassID 1 => "Pass 2 - Export HTILE for stencilRef to output"
CoreUtils.SetRenderTarget(cmd, depthStencilBufferRT); // No need for color buffer here
CoreUtils.DrawFullScreen(cmd, m_CopyStencilForSplitLighting, null, 2);
cmd.ClearRandomWriteTargets();
}
// TODO: Remove this once fix, see comment inside the function
hdCamera.SetupComputeShader(m_SubsurfaceScatteringCS, cmd);
unsafe
{
// Warning: Unity is not able to losslessly transfer integers larger than 2^24 to the shader system.
// Therefore, we bitcast uint to float in C#, and bitcast back to uint in the shader.
uint texturingModeFlags = sssParameters.texturingModeFlags;
cmd.SetComputeFloatParam(m_SubsurfaceScatteringCS, HDShaderIDs._TexturingModeFlags, *(float*)&texturingModeFlags);
}
cmd.SetComputeVectorArrayParam(m_SubsurfaceScatteringCS, HDShaderIDs._WorldScales, sssParameters.worldScales);
cmd.SetComputeVectorArrayParam(m_SubsurfaceScatteringCS, HDShaderIDs._FilterKernels, sssParameters.filterKernels);
cmd.SetComputeVectorArrayParam(m_SubsurfaceScatteringCS, HDShaderIDs._ShapeParams, sssParameters.shapeParams);
cmd.SetComputeTextureParam(m_SubsurfaceScatteringCS, m_SubsurfaceScatteringKernel, HDShaderIDs._DepthTexture, depthTextureRT);
cmd.SetComputeTextureParam(m_SubsurfaceScatteringCS, m_SubsurfaceScatteringKernel, HDShaderIDs._SSSHTile, m_HTileRT);
cmd.SetComputeTextureParam(m_SubsurfaceScatteringCS, m_SubsurfaceScatteringKernel, HDShaderIDs._IrradianceSource, diffuseBufferRT);
for (int i = 0; i < sssBufferCount; ++i)
{
cmd.SetComputeTextureParam(m_SubsurfaceScatteringCS, m_SubsurfaceScatteringKernel, HDShaderIDs._SSSBufferTexture[i], GetSSSBuffers(i));
}
if (NeedTemporarySubsurfaceBuffer())
{
cmd.SetComputeTextureParam(m_SubsurfaceScatteringCS, m_SubsurfaceScatteringKernel, HDShaderIDs._CameraFilteringBuffer, m_CameraFilteringBufferRT);
// Perform the SSS filtering pass which fills 'm_CameraFilteringBufferRT'.
// We dispatch 4x swizzled 16x16 groups per a 32x32 macro tile.
cmd.DispatchCompute(m_SubsurfaceScatteringCS, m_SubsurfaceScatteringKernel, 4, ((int)hdCamera.screenSize.x + 31) / 32, ((int)hdCamera.screenSize.y + 31) / 32);
cmd.SetGlobalTexture(HDShaderIDs._IrradianceSource, m_CameraFilteringBufferRT); // Cannot set a RT on a material
// Additively blend diffuse and specular lighting into 'm_CameraColorBufferRT'.
CoreUtils.DrawFullScreen(cmd, m_CombineLightingPass, colorBufferRT, depthStencilBufferRT);
}
else
{
cmd.SetComputeTextureParam(m_SubsurfaceScatteringCS, m_SubsurfaceScatteringKernel, HDShaderIDs._CameraColorTexture, colorBufferRT);
// Perform the SSS filtering pass which performs an in-place update of 'colorBuffer'.
// We dispatch 4x swizzled 16x16 groups per a 32x32 macro tile.
cmd.DispatchCompute(m_SubsurfaceScatteringCS, m_SubsurfaceScatteringKernel, 4, ((int)hdCamera.screenSize.x + 31) / 32, ((int)hdCamera.screenSize.y + 31) / 32);
}
}
else
{
for (int i = 0; i < sssBufferCount; ++i)
{
cmd.SetGlobalTexture(HDShaderIDs._SSSBufferTexture[i], GetSSSBuffers(i));
}
cmd.SetGlobalTexture(HDShaderIDs._IrradianceSource, diffuseBufferRT); // Cannot set a RT on a material
m_SssVerticalFilterPass.SetVectorArray(HDShaderIDs._FilterKernelsBasic, sssParameters.filterKernelsBasic);
m_SssVerticalFilterPass.SetVectorArray(HDShaderIDs._HalfRcpWeightedVariances, sssParameters.halfRcpWeightedVariances);
// Perform the vertical SSS filtering pass which fills 'm_CameraFilteringBufferRT'.
CoreUtils.DrawFullScreen(cmd, m_SssVerticalFilterPass, m_CameraFilteringBufferRT, depthStencilBufferRT);
cmd.SetGlobalTexture(HDShaderIDs._IrradianceSource, m_CameraFilteringBufferRT); // Cannot set a RT on a material
m_SssHorizontalFilterAndCombinePass.SetVectorArray(HDShaderIDs._FilterKernelsBasic, sssParameters.filterKernelsBasic);
m_SssHorizontalFilterAndCombinePass.SetVectorArray(HDShaderIDs._HalfRcpWeightedVariances, sssParameters.halfRcpWeightedVariances);
// Perform the horizontal SSS filtering pass, and combine diffuse and specular lighting into 'm_CameraColorBufferRT'.
CoreUtils.DrawFullScreen(cmd, m_SssHorizontalFilterAndCombinePass, colorBufferRT, depthStencilBufferRT);
}
}
}
}
}