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Moved shadow related code from LightweightPipeline.cs into a proper shadow pass class

/main
Felipe Lira 7 年前
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c2267f06
共有 4 个文件被更改，包括 628 次插入 和 583 次删除
  1. 621
      ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs
  2. 12
      ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipelineUtils.cs
  3. 567
      ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightShadowPass.cs
  4. 11
      ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightShadowPass.cs.meta

621
ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs
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namespace UnityEngine.Experimental.Rendering.LightweightPipeline
{
[Serializable]
public class ShadowSettings
{
public bool enabled;
public bool screenSpace;
public int shadowAtlasWidth;
public int shadowAtlasHeight;
public float maxShadowDistance;
public int directionalLightCascadeCount;
public Vector3 directionalLightCascades;
public float directionalLightNearPlaneOffset;
public RenderTextureFormat shadowmapTextureFormat;
public RenderTextureFormat screenspaceShadowmapTextureFormat;
static ShadowSettings defaultShadowSettings = null;
public static ShadowSettings Default
{
get
{
if (defaultShadowSettings == null)
{
defaultShadowSettings = new ShadowSettings();
defaultShadowSettings.enabled = true;
defaultShadowSettings.screenSpace = true;
defaultShadowSettings.shadowAtlasHeight = defaultShadowSettings.shadowAtlasWidth = 4096;
defaultShadowSettings.directionalLightCascadeCount = 1;
defaultShadowSettings.directionalLightCascades = new Vector3(0.05F, 0.2F, 0.3F);
defaultShadowSettings.directionalLightNearPlaneOffset = 5;
defaultShadowSettings.maxShadowDistance = 1000.0F;
defaultShadowSettings.shadowmapTextureFormat = RenderTextureFormat.Shadowmap;
defaultShadowSettings.screenspaceShadowmapTextureFormat = RenderTextureFormat.R8;
}
return defaultShadowSettings;
}
}
}
public struct ShadowSliceData
{
public Matrix4x4 shadowTransform;
public int offsetX;
public int offsetY;
public int resolution;
}
public struct LightData
{
public int pixelAdditionalLightsCount;

{
private readonly LightweightPipelineAsset m_Asset;
private LightweightShadowPass m_ShadowPass;
// Maximum amount of visible lights the shader can process. This controls the constant global light buffer size.
// It must match the MAX_VISIBLE_LIGHTS in LightweightInput.cginc
private static readonly int kMaxVisibleLights = 16;

private static readonly int kMaxPerObjectLights = 8;
private static readonly int kMaxLocalPixelLightPerPass = 4;
private static readonly int kMaxVertexLights = 4;
private static readonly int kMaxVertexLights = 4;
private const int kDepthStencilBufferBits = 32;
private static readonly float kRenderScaleThreshold = 0.05f;

private Camera m_CurrCamera;
private const int kMaxCascades = 4;
private int m_ShadowCasterCascadesCount;
private int m_DirectionalShadowmapRTID;
private int m_AdditionalShadowmapRTID;
private int m_ScreenSpaceShadowMapRTID;
private Matrix4x4[] m_ShadowMatrices = new Matrix4x4[kMaxCascades + 1];
private Matrix4x4[] m_LocalLightShadowMatrices = new Matrix4x4[kMaxLocalPixelLightPerPass];
private RenderTexture m_DirectionalShadowmapRT;
private RenderTexture m_AdditionalShadowmapRT;
private RenderTargetIdentifier m_ScreenSpaceShadowMapRT;
private RenderTargetIdentifier m_ColorRT;
private RenderTargetIdentifier m_CopyColorRT;
private RenderTargetIdentifier m_DepthRT;

private bool m_DepthRenderBuffer;
private MixedLightingSetup m_MixedLightingSetup;
private const int kDepthStencilBufferBits = 32;
private const int kShadowBufferBits = 16;
private Vector4[] m_DirectionalShadowSplitDistances = new Vector4[kMaxCascades];
private Vector4 m_DirectionalShadowSplitRadii;
private ShadowSettings m_ShadowSettings = ShadowSettings.Default;
private ShadowSliceData[] m_ShadowCascadeSlices = new ShadowSliceData[kMaxCascades];
private ShadowSliceData[] m_LocalLightShadowSlices = new ShadowSliceData[kMaxPerObjectLights];
private float[] m_LocalShadowStrength = new float[kMaxLocalPixelLightPerPass];
private LightShadows m_ShadowSampling;
private LightShadows m_LocalLightShadowSampling;
private int m_LocalLightShadowAtlasResolution = 512;
List<int> m_LocalLightIndices = new List<int>(kMaxLocalPixelLightPerPass);
// Pipeline pass names

private Material m_BlitMaterial;
private Material m_CopyDepthMaterial;
private Material m_ErrorMaterial;
private Material m_ScreenSpaceShadowsMaterial;
private int m_BlitTexID = Shader.PropertyToID("_BlitTex");
private CopyTextureSupport m_CopyTextureSupport;

m_Asset = asset;
BuildShadowSettings();
m_ShadowPass = new LightweightShadowPass(m_Asset);
PerFrameBuffer._GlossyEnvironmentColor = Shader.PropertyToID("_GlossyEnvironmentColor");
PerFrameBuffer._SubtractiveShadowColor = Shader.PropertyToID("_SubtractiveShadowColor");

PerCameraBuffer._AdditionalLightSpotAttenuation = Shader.PropertyToID("_AdditionalLightSpotAttenuation");
PerCameraBuffer._ScaledScreenParams = Shader.PropertyToID("_ScaledScreenParams");
DirectionalShadowConstantBuffer._WorldToShadow = Shader.PropertyToID("_WorldToShadow");
DirectionalShadowConstantBuffer._ShadowData = Shader.PropertyToID("_ShadowData");
DirectionalShadowConstantBuffer._DirShadowSplitSpheres = Shader.PropertyToID("_DirShadowSplitSpheres");
DirectionalShadowConstantBuffer._DirShadowSplitSphereRadii = Shader.PropertyToID("_DirShadowSplitSphereRadii");
DirectionalShadowConstantBuffer._ShadowOffset0 = Shader.PropertyToID("_ShadowOffset0");
DirectionalShadowConstantBuffer._ShadowOffset1 = Shader.PropertyToID("_ShadowOffset1");
DirectionalShadowConstantBuffer._ShadowOffset2 = Shader.PropertyToID("_ShadowOffset2");
DirectionalShadowConstantBuffer._ShadowOffset3 = Shader.PropertyToID("_ShadowOffset3");
DirectionalShadowConstantBuffer._ShadowmapSize = Shader.PropertyToID("_ShadowmapSize");
LocalShadowConstantBuffer._LocalWorldToShadow = Shader.PropertyToID("_LocalWorldToShadowAtlas");
LocalShadowConstantBuffer._LocalShadowData = Shader.PropertyToID("_LocalShadowData");
LocalShadowConstantBuffer._LocalShadowOffset0 = Shader.PropertyToID("_LocalShadowOffset0");
LocalShadowConstantBuffer._LocalShadowOffset1 = Shader.PropertyToID("_LocalShadowOffset1");
LocalShadowConstantBuffer._LocalShadowOffset2 = Shader.PropertyToID("_LocalShadowOffset2");
LocalShadowConstantBuffer._LocalShadowOffset3 = Shader.PropertyToID("_LocalShadowOffset3");
LocalShadowConstantBuffer._LocalShadowmapSize = Shader.PropertyToID("_LocalShadowmapSize");
m_DirectionalShadowmapRTID = Shader.PropertyToID("_ShadowMap");
m_AdditionalShadowmapRTID = Shader.PropertyToID("_LocalShadowMapAtlas");
m_ScreenSpaceShadowMapRTID = Shader.PropertyToID("_ScreenSpaceShadowMap");
m_ScreenSpaceShadowMapRT = new RenderTargetIdentifier(m_ScreenSpaceShadowMapRTID);
m_ColorRT = new RenderTargetIdentifier(CameraRenderTargetID.color);
m_CopyColorRT = new RenderTargetIdentifier(CameraRenderTargetID.copyColor);
m_DepthRT = new RenderTargetIdentifier(CameraRenderTargetID.depth);

m_CopyTextureSupport = SystemInfo.copyTextureSupport;
for (int i = 0; i < kMaxCascades; ++i)
m_DirectionalShadowSplitDistances[i] = new Vector4(0.0f, 0.0f, 0.0f, 0.0f);
m_DirectionalShadowSplitRadii = new Vector4(0.0f, 0.0f, 0.0f, 0.0f);
// Let engine know we have MSAA on for cases where we support MSAA backbuffer
if (QualitySettings.antiAliasing != m_Asset.MSAASampleCount)
QualitySettings.antiAliasing = m_Asset.MSAASampleCount;

m_BlitQuad = LightweightUtils.CreateQuadMesh(false);
m_BlitMaterial = CoreUtils.CreateEngineMaterial(m_Asset.BlitShader);
m_CopyDepthMaterial = CoreUtils.CreateEngineMaterial(m_Asset.CopyDepthShader);
m_ScreenSpaceShadowsMaterial = CoreUtils.CreateEngineMaterial(m_Asset.ScreenSpaceShadowShader);
m_ErrorMaterial = CoreUtils.CreateEngineMaterial("Hidden/InternalErrorShader");
}

continue;
var cmd = CommandBufferPool.Get("");
cullingParameters.shadowDistance = Mathf.Min(m_ShadowSettings.maxShadowDistance,
m_CurrCamera.farClipPlane);
cullingParameters.shadowDistance = Mathf.Min(m_ShadowPass.RenderingDistance, m_CurrCamera.farClipPlane);
#if UNITY_EDITOR
// Emit scene view UI

LightData lightData;
InitializeLightData(visibleLights, out lightData);
bool screenspaceShadows = ShadowPass(ref lightData, ref context);
bool screenspaceShadows = m_ShadowPass.Execute(ref m_CullResults, ref lightData, ref context);
FrameRenderingConfiguration frameRenderingConfiguration;
SetupFrameRenderingConfiguration(out frameRenderingConfiguration, screenspaceShadows, stereoEnabled, sceneViewCamera);

DepthPass(ref context, frameRenderingConfiguration);
if (screenspaceShadows)
ShadowCollectPass(frameRenderingConfiguration, ref context);
m_ShadowPass.CollectShadows(m_CurrCamera, frameRenderingConfiguration, ref context);
ForwardPass(frameRenderingConfiguration, ref lightData, ref context);

CopyTexture(cmd, CameraRenderTargetID.depth, BuiltinRenderTextureType.CameraTarget, m_CopyDepthMaterial, true);
#endif
cmd.ReleaseTemporaryRT(m_ScreenSpaceShadowMapRTID);
context.Submit();
cmd.ReleaseTemporaryRT(CameraRenderTargetID.depthCopy);
cmd.ReleaseTemporaryRT(CameraRenderTargetID.depth);
cmd.ReleaseTemporaryRT(CameraRenderTargetID.color);

context.Submit();
if (m_DirectionalShadowmapRT)
{
RenderTexture.ReleaseTemporary(m_DirectionalShadowmapRT);
m_DirectionalShadowmapRT = null;
}
m_ShadowPass.Dispose(cmd);
if (m_AdditionalShadowmapRT)
{
RenderTexture.ReleaseTemporary(m_AdditionalShadowmapRT);
m_AdditionalShadowmapRT = null;
}
context.Submit();
private void InitializeShadowPass()
{
m_DirectionalShadowmapRT = null;
m_AdditionalShadowmapRT = null;
m_ShadowSampling = LightShadows.None;
m_LocalLightShadowSampling = LightShadows.None;
for (int i = 0; i < kMaxLocalPixelLightPerPass; ++i)
{
m_LocalLightShadowMatrices[i] = Matrix4x4.identity;
m_LocalShadowStrength[i] = 0.0f;
}
}
private bool ShadowPass(ref LightData lightData, ref ScriptableRenderContext context)
{
InitializeShadowPass();
if (!m_Asset.AreShadowsEnabled())
return false;
bool directionalShadowmapRendered = RenderDirectionalCascadeShadowmap(ref lightData, ref context);
RenderLocalShadowmapAtlas(ref lightData, ref context);
return directionalShadowmapRendered && m_ShadowSettings.screenSpace;
}
private void ShadowCollectPass(FrameRenderingConfiguration frameRenderingConfiguration, ref ScriptableRenderContext context)
{
CommandBuffer cmd = CommandBufferPool.Get("Collect Shadows");
SetShadowCollectPassKeywords(cmd);
// Note: The source isn't actually 'used', but there's an engine peculiarity (bug) that
// doesn't like null sources when trying to determine a stereo-ized blit. So for proper
// stereo functionality, we use the screen-space shadow map as the source (until we have
// a better solution).
// An alternative would be DrawProcedural, but that would require further changes in the shader.
cmd.Blit(m_ScreenSpaceShadowMapRT, m_ScreenSpaceShadowMapRT, m_ScreenSpaceShadowsMaterial);
StartStereoRendering(ref context, frameRenderingConfiguration);
context.ExecuteCommandBuffer(cmd);
StopStereoRendering(ref context, frameRenderingConfiguration);
CommandBufferPool.Release(cmd);
}
private void DepthPass(ref ScriptableRenderContext context, FrameRenderingConfiguration frameRenderingConfiguration)
{
CommandBuffer cmd = CommandBufferPool.Get("Depth Prepass");

renderQueueRange = RenderQueueRange.opaque
};
StartStereoRendering(ref context, frameRenderingConfiguration);
LightweightUtils.StartStereoRendering(m_CurrCamera, ref context, frameRenderingConfiguration);
StopStereoRendering(ref context, frameRenderingConfiguration);
LightweightUtils.StopStereoRendering(m_CurrCamera, ref context, frameRenderingConfiguration);
}
private void ForwardPass(FrameRenderingConfiguration frameRenderingConfiguration, ref LightData lightData, ref ScriptableRenderContext context)

}
}
private void BuildShadowSettings()
{
m_ShadowSettings = ShadowSettings.Default;
m_ShadowSettings.screenSpace = SystemInfo.graphicsDeviceType != GraphicsDeviceType.OpenGLES2;
m_ShadowSettings.directionalLightCascadeCount = (m_ShadowSettings.screenSpace) ? m_Asset.CascadeCount : 1;
m_ShadowSettings.shadowAtlasWidth = m_Asset.ShadowAtlasResolution;
m_ShadowSettings.shadowAtlasHeight = m_Asset.ShadowAtlasResolution;
m_ShadowSettings.maxShadowDistance = m_Asset.ShadowDistance;
m_ShadowSettings.shadowmapTextureFormat = SystemInfo.SupportsRenderTextureFormat(RenderTextureFormat.Shadowmap)
? RenderTextureFormat.Shadowmap
: RenderTextureFormat.Depth;
m_ShadowSettings.screenspaceShadowmapTextureFormat = SystemInfo.SupportsRenderTextureFormat(RenderTextureFormat.R8)
? RenderTextureFormat.R8
: RenderTextureFormat.ARGB32;
switch (m_ShadowSettings.directionalLightCascadeCount)
{
case 1:
m_ShadowSettings.directionalLightCascades = new Vector3(1.0f, 0.0f, 0.0f);
break;
case 2:
m_ShadowSettings.directionalLightCascades = new Vector3(m_Asset.Cascade2Split, 1.0f, 0.0f);
break;
default:
m_ShadowSettings.directionalLightCascades = m_Asset.Cascade4Split;
break;
}
}
private void SetupFrameRenderingConfiguration(out FrameRenderingConfiguration configuration, bool screenspaceShadows, bool stereoEnabled, bool sceneViewCamera)
{
configuration = (stereoEnabled) ? FrameRenderingConfiguration.Stereo : FrameRenderingConfiguration.None;

if (sceneViewCamera)
m_RequireDepthTexture = true;
if (screenspaceShadows)
{
m_RequireDepthTexture = m_ShadowSettings.screenSpace;
if (!msaaEnabled)
intermediateTexture = true;
}
m_RequireDepthTexture = m_RequireDepthTexture || screenspaceShadows;
if (msaaEnabled)
{

if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.DepthCopy))
cmd.GetTemporaryRT(CameraRenderTargetID.depthCopy, depthRTDesc, FilterMode.Bilinear);
if (shadows && m_ShadowSettings.screenSpace)
{
var screenspaceShadowmapDesc = baseDesc;
screenspaceShadowmapDesc.depthBufferBits = 0;
screenspaceShadowmapDesc.colorFormat = m_ShadowSettings.screenspaceShadowmapTextureFormat;
cmd.GetTemporaryRT(m_ScreenSpaceShadowMapRTID, screenspaceShadowmapDesc, FilterMode.Bilinear);
}
m_ShadowPass.InitializeResources(cmd, baseDesc);
}
var colorRTDesc = baseDesc;

{
Vector4 lightPos, lightColor, lightDistanceAttenuation, lightSpotDir, lightSpotAttenuation;
List<VisibleLight> lights = lightData.visibleLights;
InitializeLightConstants(lightData.visibleLights, lightData.mainLightIndex, m_ShadowSampling != LightShadows.None, out lightPos, out lightColor, out lightDistanceAttenuation, out lightSpotDir, out lightSpotAttenuation);
InitializeLightConstants(lightData.visibleLights, lightData.mainLightIndex, m_ShadowPass.HasDirectionalShadowmap, out lightPos, out lightColor, out lightDistanceAttenuation, out lightSpotDir, out lightSpotAttenuation);
if (lightData.mainLightIndex >= 0)
{

cmd.SetGlobalVectorArray(PerCameraBuffer._AdditionalLightSpotAttenuation, m_LightSpotAttenuations);
}
private void SetupShadowCasterConstants(CommandBuffer cmd, ref VisibleLight visibleLight, Matrix4x4 proj, float cascadeResolution)
{
Light light = visibleLight.light;
float bias = 0.0f;
float normalBias = 0.0f;
// Use same kernel radius as built-in pipeline so we can achieve same bias results
// with the default light bias parameters.
const float kernelRadius = 3.65f;
if (visibleLight.lightType == LightType.Directional)
{
// Scale bias by cascade's world space depth range.
// Directional shadow lights have orthogonal projection.
// proj.m22 = -2 / (far - near) since the projection's depth range is [-1.0, 1.0]
// In order to be correct we should multiply bias by 0.5 but this introducing aliasing along cascades more visible.
float sign = (SystemInfo.usesReversedZBuffer) ? 1.0f : -1.0f;
bias = light.shadowBias * proj.m22 * sign;
// Currently only square POT cascades resolutions are used.
// We scale normalBias
double frustumWidth = 2.0 / (double)proj.m00;
double frustumHeight = 2.0 / (double)proj.m11;
float texelSizeX = (float)(frustumWidth / (double)cascadeResolution);
float texelSizeY = (float)(frustumHeight / (double)cascadeResolution);
float texelSize = Mathf.Max(texelSizeX, texelSizeY);
// Since we are applying normal bias on caster side we want an inset normal offset
// thus we use a negative normal bias.
normalBias = -light.shadowNormalBias * texelSize * kernelRadius;
}
else if (visibleLight.lightType == LightType.Spot)
{
float sign = (SystemInfo.usesReversedZBuffer) ? -1.0f : 1.0f;
bias = light.shadowBias * sign;
normalBias = 0.0f;
}
else
{
Debug.LogWarning("Only spot and directional shadow casters are supported in lightweight pipeline");
}
Vector3 lightDirection = -visibleLight.localToWorld.GetColumn(2);
cmd.SetGlobalVector("_ShadowBias", new Vector4(bias, normalBias, 0.0f, 0.0f));
cmd.SetGlobalVector("_LightDirection", new Vector4(lightDirection.x, lightDirection.y, lightDirection.z, 0.0f));
}
private void SetupDirectionalShadowReceiverConstants(CommandBuffer cmd, VisibleLight shadowLight, ref ScriptableRenderContext context)
{
Light light = shadowLight.light;
int cascadeCount = m_ShadowCasterCascadesCount;
for (int i = 0; i < kMaxCascades; ++i)
m_ShadowMatrices[i] = (cascadeCount >= i) ? m_ShadowCascadeSlices[i].shadowTransform : Matrix4x4.identity;
// We setup and additional a no-op WorldToShadow matrix in the last index
// because the ComputeCascadeIndex function in Shadows.hlsl can return an index
// out of bounds. (position not inside any cascade) and we want to avoid branching
Matrix4x4 noOpShadowMatrix = Matrix4x4.zero;
noOpShadowMatrix.m33 = (SystemInfo.usesReversedZBuffer) ? 1.0f : 0.0f;
m_ShadowMatrices[kMaxCascades] = noOpShadowMatrix;
float invShadowResolution = 1.0f / m_Asset.ShadowAtlasResolution;
float invHalfShadowResolution = 0.5f * invShadowResolution;
cmd.SetGlobalTexture(m_DirectionalShadowmapRTID, m_DirectionalShadowmapRT);
cmd.SetGlobalMatrixArray(DirectionalShadowConstantBuffer._WorldToShadow, m_ShadowMatrices);
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowData, new Vector4(light.shadowStrength, 0.0f, 0.0f, 0.0f));
cmd.SetGlobalVectorArray(DirectionalShadowConstantBuffer._DirShadowSplitSpheres, m_DirectionalShadowSplitDistances);
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._DirShadowSplitSphereRadii, m_DirectionalShadowSplitRadii);
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowOffset0, new Vector4(-invHalfShadowResolution, -invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowOffset1, new Vector4(invHalfShadowResolution, -invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowOffset2, new Vector4(-invHalfShadowResolution, invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowOffset3, new Vector4(invHalfShadowResolution, invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowmapSize, new Vector4(invShadowResolution, invShadowResolution, m_Asset.ShadowAtlasResolution, m_Asset.ShadowAtlasResolution));
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
}
private void SetupLocalLightsShadowReceiverConstants(CommandBuffer cmd, ref ScriptableRenderContext context)
{
for (int i = 0; i < kMaxLocalPixelLightPerPass; ++i)
m_LocalLightShadowMatrices[i] = m_LocalLightShadowSlices[i].shadowTransform;
float invShadowResolution = 1.0f / m_LocalLightShadowAtlasResolution;
float invHalfShadowResolution = 0.5f * invShadowResolution;
cmd.SetGlobalTexture(m_AdditionalShadowmapRTID, m_AdditionalShadowmapRT);
cmd.SetGlobalMatrixArray(LocalShadowConstantBuffer._LocalWorldToShadow, m_LocalLightShadowMatrices);
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowData, new Vector4(m_LocalShadowStrength[0], m_LocalShadowStrength[1], m_LocalShadowStrength[2], m_LocalShadowStrength[3]));
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset0, new Vector4(-invHalfShadowResolution, -invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset1, new Vector4(invHalfShadowResolution, -invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset2, new Vector4(-invHalfShadowResolution, invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset3, new Vector4(invHalfShadowResolution, invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowmapSize, new Vector4(invShadowResolution, invShadowResolution, m_LocalLightShadowAtlasResolution, m_LocalLightShadowAtlasResolution));
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
}
private void SetShaderKeywords(CommandBuffer cmd, ref LightData lightData)
{
List<VisibleLight> visibleLights = lightData.visibleLights;

CoreUtils.SetKeyword(cmd, "_SHADOWS_ENABLED", m_ShadowSampling != LightShadows.None);
CoreUtils.SetKeyword(cmd, "_LOCAL_SHADOWS_ENABLED", m_LocalLightShadowSampling != LightShadows.None);
CoreUtils.SetKeyword(cmd, "_SHADOWS_ENABLED", m_ShadowPass.HasDirectionalShadowmap);
CoreUtils.SetKeyword(cmd, "_LOCAL_SHADOWS_ENABLED", m_ShadowPass.HasLocalLightsShadowmap);
//TIM: Not used in shader for V1 to reduce keywords
CoreUtils.SetKeyword(cmd, "_MAIN_LIGHT_COOKIE", mainLightIndex != -1 && LightweightUtils.IsSupportedCookieType(visibleLights[mainLightIndex].lightType) && visibleLights[mainLightIndex].light.cookie != null);

CoreUtils.SetKeyword(cmd, "SOFTPARTICLES_ON", m_RequireDepthTexture && m_Asset.RequireSoftParticles);
}
private void SetShadowCollectPassKeywords(CommandBuffer cmd)
{
CoreUtils.SetKeyword(cmd, "_SHADOWS_SOFT", m_ShadowSampling == LightShadows.Soft);
CoreUtils.SetKeyword(cmd, "_SHADOWS_CASCADE", m_Asset.CascadeCount > 1);
}
private bool RenderDirectionalCascadeShadowmap(ref LightData lightData, ref ScriptableRenderContext context)
{
int shadowLightIndex = lightData.mainLightIndex;
if (shadowLightIndex == -1)
return false;
VisibleLight shadowLight = lightData.visibleLights[shadowLightIndex];
Light light = shadowLight.light;
Debug.Assert(shadowLight.lightType == LightType.Directional);
if (light.shadows == LightShadows.None)
return false;
CommandBuffer cmd = CommandBufferPool.Get("Prepare Directional Shadowmap");
m_ShadowCasterCascadesCount = m_ShadowSettings.directionalLightCascadeCount;
int shadowResolution = GetMaxTileResolutionInAtlas(m_ShadowSettings.shadowAtlasWidth, m_ShadowSettings.shadowAtlasHeight, m_ShadowCasterCascadesCount);
float shadowNearPlane = m_Asset.ShadowNearOffset;
Bounds bounds;
if (!m_CullResults.GetShadowCasterBounds(shadowLightIndex, out bounds))
return false;
Matrix4x4 view, proj;
var settings = new DrawShadowsSettings(m_CullResults, shadowLightIndex);
RenderTextureDescriptor shadowmapDescriptor = new RenderTextureDescriptor(m_ShadowSettings.shadowAtlasWidth,
m_ShadowSettings.shadowAtlasHeight, m_ShadowSettings.shadowmapTextureFormat, kShadowBufferBits);
shadowmapDescriptor.shadowSamplingMode = ShadowSamplingMode.CompareDepths;
m_DirectionalShadowmapRT = RenderTexture.GetTemporary(shadowmapDescriptor);
m_DirectionalShadowmapRT.filterMode = FilterMode.Bilinear;
m_DirectionalShadowmapRT.wrapMode = TextureWrapMode.Clamp;
// LightweightPipeline.SetRenderTarget is meant to be used with camera targets, not shadowmaps
CoreUtils.SetRenderTarget(cmd, m_DirectionalShadowmapRT, ClearFlag.Depth, CoreUtils.ConvertSRGBToActiveColorSpace(m_CurrCamera.backgroundColor));
bool success = false;
for (int cascadeIndex = 0; cascadeIndex < m_ShadowCasterCascadesCount; ++cascadeIndex)
{
success = m_CullResults.ComputeDirectionalShadowMatricesAndCullingPrimitives(shadowLightIndex,
cascadeIndex, m_ShadowCasterCascadesCount, m_ShadowSettings.directionalLightCascades, shadowResolution, shadowNearPlane, out view, out proj,
out settings.splitData);
float cullingSphereRadius = settings.splitData.cullingSphere.w;
m_DirectionalShadowSplitDistances[cascadeIndex] = settings.splitData.cullingSphere;
m_DirectionalShadowSplitRadii[cascadeIndex] = cullingSphereRadius * cullingSphereRadius;
if (!success)
break;
m_ShadowCascadeSlices[cascadeIndex].offsetX = (cascadeIndex % 2) * shadowResolution;
m_ShadowCascadeSlices[cascadeIndex].offsetY = (cascadeIndex / 2) * shadowResolution;
m_ShadowCascadeSlices[cascadeIndex].resolution = shadowResolution;
SetupShadowCasterConstants(cmd, ref shadowLight, proj, shadowResolution);
SetupShadowSliceTransform(ref m_ShadowCascadeSlices[cascadeIndex], m_ShadowSettings.shadowAtlasWidth, m_ShadowSettings.shadowAtlasHeight, proj, view);
RenderShadowSlice(cmd, ref context, ref m_ShadowCascadeSlices[cascadeIndex], proj, view, settings);
}
if (success)
{
m_ShadowSampling = (m_Asset.ShadowSetting != ShadowType.SOFT_SHADOWS) ? LightShadows.Hard : light.shadows;
// In order to avoid shader variants explosion we only do hard shadows when sampling shadowmap in the lit pass.
// GLES2 platform is forced to hard single cascade shadows.
if (!m_ShadowSettings.screenSpace)
m_ShadowSampling = LightShadows.Hard;
SetupDirectionalShadowReceiverConstants(cmd, shadowLight, ref context);
}
context.ExecuteCommandBuffer(cmd);
CommandBufferPool.Release(cmd);
return success;
}
private void RenderLocalShadowmapAtlas(ref LightData lightData, ref ScriptableRenderContext context)
{
List<int> localLightIndices = lightData.localLightIndices;
List<VisibleLight> visibleLights = lightData.visibleLights;
int shadowCastingLightsCount = 0;
for (int i = 0; i < localLightIndices.Count; ++i)
{
VisibleLight shadowLight = visibleLights[localLightIndices[i]];
if (shadowLight.lightType == LightType.Spot && shadowLight.light.shadows != LightShadows.None)
shadowCastingLightsCount++;
}
if (shadowCastingLightsCount == 0)
return;
CommandBuffer cmd = CommandBufferPool.Get("Prepare Local Lights Shadowmap");
Matrix4x4 view, proj;
Bounds bounds;
// TODO: Add support to point light shadows. We make a simplification here that only works
// for spot lights and with max spot shadows per pass.
int atlasWidth = m_LocalLightShadowAtlasResolution;
int atlasHeight = m_LocalLightShadowAtlasResolution;
int sliceResolution = GetMaxTileResolutionInAtlas(atlasWidth, atlasHeight, shadowCastingLightsCount);
int shadowSampling = 0;
RenderTextureDescriptor shadowmapDescriptor = new RenderTextureDescriptor(m_LocalLightShadowAtlasResolution, m_LocalLightShadowAtlasResolution, m_ShadowSettings.shadowmapTextureFormat, kShadowBufferBits);
shadowmapDescriptor.shadowSamplingMode = ShadowSamplingMode.CompareDepths;
m_AdditionalShadowmapRT = RenderTexture.GetTemporary(shadowmapDescriptor);
m_AdditionalShadowmapRT.filterMode = FilterMode.Bilinear;
m_AdditionalShadowmapRT.wrapMode = TextureWrapMode.Clamp;
// LightweightPipeline.SetRenderTarget is meant to be used with camera targets, not shadowmaps
CoreUtils.SetRenderTarget(cmd, m_AdditionalShadowmapRT, ClearFlag.Depth, CoreUtils.ConvertSRGBToActiveColorSpace(m_CurrCamera.backgroundColor));
for (int i = 0; i < localLightIndices.Count; ++i)
{
int shadowLightIndex = localLightIndices[i];
VisibleLight shadowLight = visibleLights[shadowLightIndex];
Light light = shadowLight.light;
if (shadowLight.lightType != LightType.Spot || shadowLight.light.shadows == LightShadows.None)
continue;
if (!m_CullResults.GetShadowCasterBounds(shadowLightIndex, out bounds))
continue;
var settings = new DrawShadowsSettings(m_CullResults, shadowLightIndex);
if (m_CullResults.ComputeSpotShadowMatricesAndCullingPrimitives(shadowLightIndex, out view, out proj, out settings.splitData))
{
// This way of computing the shadow slice only work for spots and with most 4 shadow casting lights per pass
// Change this when point lights are supported.
Debug.Assert(kMaxLocalPixelLightPerPass == 4 && shadowLight.lightType == LightType.Spot);
m_LocalLightShadowSlices[i].offsetX = (i % 2) * sliceResolution;
m_LocalLightShadowSlices[i].offsetY = (i / 2) * sliceResolution;
m_LocalLightShadowSlices[i].resolution = sliceResolution;
SetupShadowCasterConstants(cmd, ref shadowLight, proj, sliceResolution);
SetupShadowSliceTransform(ref m_LocalLightShadowSlices[i], atlasWidth, atlasHeight, proj, view);
RenderShadowSlice(cmd, ref context, ref m_LocalLightShadowSlices[i], proj, view, settings);
m_LocalShadowStrength[i] = light.shadowStrength;
shadowSampling = Math.Max(shadowSampling, (int)light.shadows);
lightData.localShadowMask |= (1 << shadowLightIndex);
}
}
SetupLocalLightsShadowReceiverConstants(cmd, ref context);
m_LocalLightShadowSampling = (LightShadows)Math.Min(shadowSampling, (int)m_Asset.ShadowSetting);
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
}
private void SetupShadowSliceTransform(ref ShadowSliceData shadowSliceData, int atlasWidth, int atlasHeight, Matrix4x4 proj, Matrix4x4 view)
{
// Currently CullResults ComputeDirectionalShadowMatricesAndCullingPrimitives doesn't
// apply z reversal to projection matrix. We need to do it manually here.
if (SystemInfo.usesReversedZBuffer)
{
proj.m20 = -proj.m20;
proj.m21 = -proj.m21;
proj.m22 = -proj.m22;
proj.m23 = -proj.m23;
}
Matrix4x4 worldToShadow = proj * view;
var textureScaleAndBias = Matrix4x4.identity;
textureScaleAndBias.m00 = 0.5f;
textureScaleAndBias.m11 = 0.5f;
textureScaleAndBias.m22 = 0.5f;
textureScaleAndBias.m03 = 0.5f;
textureScaleAndBias.m23 = 0.5f;
textureScaleAndBias.m13 = 0.5f;
// Apply texture scale and offset to save a MAD in shader.
worldToShadow = textureScaleAndBias * worldToShadow;
var cascadeAtlas = Matrix4x4.identity;
float oneOverAtlasWidth = 1.0f / atlasWidth;
float oneOverAtlasHeight = 1.0f / atlasHeight;
cascadeAtlas.m00 = shadowSliceData.resolution * oneOverAtlasWidth;
cascadeAtlas.m11 = shadowSliceData.resolution * oneOverAtlasHeight;
cascadeAtlas.m03 = shadowSliceData.offsetX * oneOverAtlasWidth;
cascadeAtlas.m13 = shadowSliceData.offsetY * oneOverAtlasHeight;
// Apply shadow slice scale and offset
worldToShadow = cascadeAtlas * worldToShadow;
shadowSliceData.shadowTransform = worldToShadow;
}
private void RenderShadowSlice(CommandBuffer cmd, ref ScriptableRenderContext context, ref ShadowSliceData shadowSliceData,
Matrix4x4 proj, Matrix4x4 view, DrawShadowsSettings settings)
{
cmd.SetViewport(new Rect(shadowSliceData.offsetX, shadowSliceData.offsetY, shadowSliceData.resolution, shadowSliceData.resolution));
cmd.EnableScissorRect(new Rect(shadowSliceData.offsetX + 4, shadowSliceData.offsetY + 4, shadowSliceData.resolution - 8, shadowSliceData.resolution - 8));
cmd.SetViewProjectionMatrices(view, proj);
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
context.DrawShadows(ref settings);
cmd.DisableScissorRect();
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
}
private int GetMaxTileResolutionInAtlas(int atlasWidth, int atlasHeight, int tileCount)
{
int resolution = Mathf.Min(atlasWidth, atlasHeight);
if (tileCount > Mathf.Log(resolution))
{
Debug.LogError(
String.Format(
"Cannot fit {0} tiles into current shadowmap atlas of size ({1}, {2}). ShadowMap Resolution set to zero.",
tileCount, atlasWidth, atlasHeight));
return 0;
}
int currentTileCount = atlasWidth / resolution * atlasHeight / resolution;
while (currentTileCount < tileCount)
{
resolution = resolution >> 1;
currentTileCount = atlasWidth / resolution * atlasHeight / resolution;
}
return resolution;
}
StartStereoRendering(ref context, renderingConfig);
LightweightUtils.StartStereoRendering(m_CurrCamera, ref context, renderingConfig);
CommandBuffer cmd = CommandBufferPool.Get("SetCameraRenderTarget");
bool intermediateTexture = LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.IntermediateTexture);

return settings;
}
private void RenderPostProcess(CommandBuffer cmd, RenderTargetIdentifier source, RenderTargetIdentifier dest, bool opaqueOnly)
{
m_PostProcessRenderContext.Reset();
m_PostProcessRenderContext.camera = m_CurrCamera;
m_PostProcessRenderContext.source = source;
m_PostProcessRenderContext.sourceFormat = m_ColorFormat;
m_PostProcessRenderContext.destination = dest;
m_PostProcessRenderContext.command = cmd;
m_PostProcessRenderContext.flip = true;
if (opaqueOnly)
{
m_CameraPostProcessLayer.RenderOpaqueOnly(m_PostProcessRenderContext);
}
else
m_CameraPostProcessLayer.Render(m_PostProcessRenderContext);
}
private void SetRenderTarget(CommandBuffer cmd, RenderTargetIdentifier colorRT, ClearFlag clearFlag = ClearFlag.None)
{
int depthSlice = (m_IntermediateTextureArray) ? -1 : 0;

CoreUtils.SetRenderTarget(cmd, colorRT, depthRT, clearFlag, CoreUtils.ConvertSRGBToActiveColorSpace(m_CurrCamera.backgroundColor), 0, CubemapFace.Unknown, depthSlice);
}
private void RenderPostProcess(CommandBuffer cmd, RenderTargetIdentifier source, RenderTargetIdentifier dest, bool opaqueOnly)
{
m_PostProcessRenderContext.Reset();
m_PostProcessRenderContext.camera = m_CurrCamera;
m_PostProcessRenderContext.source = source;
m_PostProcessRenderContext.sourceFormat = m_ColorFormat;
m_PostProcessRenderContext.destination = dest;
m_PostProcessRenderContext.command = cmd;
m_PostProcessRenderContext.flip = true;
if (opaqueOnly)
{
m_CameraPostProcessLayer.RenderOpaqueOnly(m_PostProcessRenderContext);
}
else
m_CameraPostProcessLayer.Render(m_PostProcessRenderContext);
}
private void Blit(CommandBuffer cmd, FrameRenderingConfiguration renderingConfig, RenderTargetIdentifier sourceRT, RenderTargetIdentifier destRT, Material material = null)
{
cmd.SetGlobalTexture(m_BlitTexID, sourceRT);

cmd.CopyTexture(sourceRT, destRT);
else
cmd.Blit(sourceRT, destRT, copyMaterial);
}
private void StartStereoRendering(ref ScriptableRenderContext context, FrameRenderingConfiguration renderingConfiguration)
{
if (LightweightUtils.HasFlag(renderingConfiguration, FrameRenderingConfiguration.Stereo))
context.StartMultiEye(m_CurrCamera);
}
private void StopStereoRendering(ref ScriptableRenderContext context, FrameRenderingConfiguration renderingConfiguration)
{
if (LightweightUtils.HasFlag(renderingConfiguration, FrameRenderingConfiguration.Stereo))
context.StopMultiEye(m_CurrCamera);
}
}
}

12
ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipelineUtils.cs
查看文件


public static class LightweightUtils
{
public static void StartStereoRendering(Camera camera, ref ScriptableRenderContext context, FrameRenderingConfiguration renderingConfiguration)
{
if (HasFlag(renderingConfiguration, FrameRenderingConfiguration.Stereo))
context.StartMultiEye(camera);
}
public static void StopStereoRendering(Camera camera, ref ScriptableRenderContext context, FrameRenderingConfiguration renderingConfiguration)
{
if (HasFlag(renderingConfiguration, FrameRenderingConfiguration.Stereo))
context.StopMultiEye(camera);
}
public static void GetLightCookieMatrix(VisibleLight light, out Matrix4x4 cookieMatrix)
{
cookieMatrix = Matrix4x4.Inverse(light.localToWorld);

567
ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightShadowPass.cs
查看文件


using System;
using System.Collections.Generic;
using UnityEngine.Rendering;
namespace UnityEngine.Experimental.Rendering.LightweightPipeline
{
[Serializable]
public class ShadowSettings
{
public LightShadows shadowType;
public bool screenSpace;
public int shadowAtlasWidth;
public int shadowAtlasHeight;
public float maxShadowDistance;
public int directionalLightCascadeCount;
public Vector3 directionalLightCascades;
public float directionalLightNearPlaneOffset;
public RenderTextureFormat shadowmapTextureFormat;
public RenderTextureFormat screenspaceShadowmapTextureFormat;
static ShadowSettings defaultShadowSettings = null;
public static ShadowSettings Default
{
get
{
if (defaultShadowSettings == null)
{
defaultShadowSettings = new ShadowSettings();
defaultShadowSettings.shadowType = LightShadows.None;
defaultShadowSettings.screenSpace = true;
defaultShadowSettings.shadowAtlasHeight = defaultShadowSettings.shadowAtlasWidth = 4096;
defaultShadowSettings.directionalLightCascadeCount = 1;
defaultShadowSettings.directionalLightCascades = new Vector3(0.05F, 0.2F, 0.3F);
defaultShadowSettings.directionalLightNearPlaneOffset = 5;
defaultShadowSettings.maxShadowDistance = 1000.0F;
defaultShadowSettings.shadowmapTextureFormat = RenderTextureFormat.Shadowmap;
defaultShadowSettings.screenspaceShadowmapTextureFormat = RenderTextureFormat.R8;
}
return defaultShadowSettings;
}
}
}
public struct ShadowSliceData
{
public Matrix4x4 shadowTransform;
public int offsetX;
public int offsetY;
public int resolution;
}
public class LightweightShadowPass
{
public bool IsEnabled { get { return m_ShadowSettings.shadowType != LightShadows.None; } }
public bool RequireScreenSpaceShadowmap { get { return IsEnabled && m_ShadowSettings.screenSpace; } }
public float RenderingDistance { get { return m_ShadowSettings.maxShadowDistance; } }
public bool HasDirectionalShadowmap { get { return m_ShadowSampling != LightShadows.None; } }
public bool HasLocalLightsShadowmap { get { return m_LocalLightShadowSampling != LightShadows.None; } }
// TODO: move to a global settings file
private static readonly int kMaxPerObjectLights = 8;
private static readonly int kMaxLocalPixelLightPerPass = 4;
private const int kMaxCascades = 4;
private int m_ShadowCasterCascadesCount;
private int m_DirectionalShadowmapRTID;
private int m_AdditionalShadowmapRTID;
private int m_ScreenSpaceShadowMapRTID;
private Matrix4x4[] m_ShadowMatrices = new Matrix4x4[kMaxCascades + 1];
private Matrix4x4[] m_LocalLightShadowMatrices = new Matrix4x4[kMaxLocalPixelLightPerPass];
private RenderTexture m_DirectionalShadowmapRT;
private RenderTexture m_AdditionalShadowmapRT;
private RenderTargetIdentifier m_ScreenSpaceShadowMapRT;
private const int kShadowBufferBits = 16;
private Vector4[] m_DirectionalShadowSplitDistances = new Vector4[kMaxCascades];
private Vector4 m_DirectionalShadowSplitRadii;
private ShadowSettings m_ShadowSettings = ShadowSettings.Default;
private ShadowSliceData[] m_ShadowCascadeSlices = new ShadowSliceData[kMaxCascades];
private ShadowSliceData[] m_LocalLightShadowSlices = new ShadowSliceData[kMaxPerObjectLights];
private float[] m_LocalShadowStrength = new float[kMaxLocalPixelLightPerPass];
private LightShadows m_ShadowSampling;
private LightShadows m_LocalLightShadowSampling;
private int m_LocalLightShadowAtlasResolution = 512;
private Material m_ScreenSpaceShadowsMaterial;
public LightweightShadowPass(LightweightPipelineAsset pipelineAsset)
{
BuildShadowSettings(pipelineAsset);
DirectionalShadowConstantBuffer._WorldToShadow = Shader.PropertyToID("_WorldToShadow");
DirectionalShadowConstantBuffer._ShadowData = Shader.PropertyToID("_ShadowData");
DirectionalShadowConstantBuffer._DirShadowSplitSpheres = Shader.PropertyToID("_DirShadowSplitSpheres");
DirectionalShadowConstantBuffer._DirShadowSplitSphereRadii = Shader.PropertyToID("_DirShadowSplitSphereRadii");
DirectionalShadowConstantBuffer._ShadowOffset0 = Shader.PropertyToID("_ShadowOffset0");
DirectionalShadowConstantBuffer._ShadowOffset1 = Shader.PropertyToID("_ShadowOffset1");
DirectionalShadowConstantBuffer._ShadowOffset2 = Shader.PropertyToID("_ShadowOffset2");
DirectionalShadowConstantBuffer._ShadowOffset3 = Shader.PropertyToID("_ShadowOffset3");
DirectionalShadowConstantBuffer._ShadowmapSize = Shader.PropertyToID("_ShadowmapSize");
LocalShadowConstantBuffer._LocalWorldToShadow = Shader.PropertyToID("_LocalWorldToShadowAtlas");
LocalShadowConstantBuffer._LocalShadowData = Shader.PropertyToID("_LocalShadowData");
LocalShadowConstantBuffer._LocalShadowOffset0 = Shader.PropertyToID("_LocalShadowOffset0");
LocalShadowConstantBuffer._LocalShadowOffset1 = Shader.PropertyToID("_LocalShadowOffset1");
LocalShadowConstantBuffer._LocalShadowOffset2 = Shader.PropertyToID("_LocalShadowOffset2");
LocalShadowConstantBuffer._LocalShadowOffset3 = Shader.PropertyToID("_LocalShadowOffset3");
LocalShadowConstantBuffer._LocalShadowmapSize = Shader.PropertyToID("_LocalShadowmapSize");
m_DirectionalShadowmapRTID = Shader.PropertyToID("_ShadowMap");
m_AdditionalShadowmapRTID = Shader.PropertyToID("_LocalShadowMapAtlas");
m_ScreenSpaceShadowMapRTID = Shader.PropertyToID("_ScreenSpaceShadowMap");
m_ScreenSpaceShadowMapRT = new RenderTargetIdentifier(m_ScreenSpaceShadowMapRTID);
for (int i = 0; i < kMaxCascades; ++i)
m_DirectionalShadowSplitDistances[i] = new Vector4(0.0f, 0.0f, 0.0f, 0.0f);
m_DirectionalShadowSplitRadii = new Vector4(0.0f, 0.0f, 0.0f, 0.0f);
m_ScreenSpaceShadowsMaterial = CoreUtils.CreateEngineMaterial(pipelineAsset.ScreenSpaceShadowShader);
}
public void InitializeResources(CommandBuffer cmd, RenderTextureDescriptor renderTextureDesc)
{
if (RequireScreenSpaceShadowmap)
{
renderTextureDesc.depthBufferBits = 0;
renderTextureDesc.colorFormat = m_ShadowSettings.screenspaceShadowmapTextureFormat;
cmd.GetTemporaryRT(m_ScreenSpaceShadowMapRTID, renderTextureDesc, FilterMode.Bilinear);
}
}
public void Dispose(CommandBuffer cmd)
{
cmd.ReleaseTemporaryRT(m_ScreenSpaceShadowMapRTID);
if (m_DirectionalShadowmapRT)
{
RenderTexture.ReleaseTemporary(m_DirectionalShadowmapRT);
m_DirectionalShadowmapRT = null;
}
if (m_AdditionalShadowmapRT)
{
RenderTexture.ReleaseTemporary(m_AdditionalShadowmapRT);
m_AdditionalShadowmapRT = null;
}
}
public bool Execute(ref CullResults cullResults, ref LightData lightData, ref ScriptableRenderContext context)
{
Clear();
if (!IsEnabled)
return false;
bool directionalShadowmapRendered = RenderDirectionalCascadeShadowmap(ref cullResults, ref lightData, ref context);
RenderLocalShadowmapAtlas(ref cullResults, ref lightData, ref context);
return directionalShadowmapRendered && m_ShadowSettings.screenSpace;
}
public void CollectShadows(Camera camera, FrameRenderingConfiguration frameRenderingConfiguration, ref ScriptableRenderContext context)
{
CommandBuffer cmd = CommandBufferPool.Get("Collect Shadows");
SetShadowCollectPassKeywords(cmd);
// Note: The source isn't actually 'used', but there's an engine peculiarity (bug) that
// doesn't like null sources when trying to determine a stereo-ized blit. So for proper
// stereo functionality, we use the screen-space shadow map as the source (until we have
// a better solution).
// An alternative would be DrawProcedural, but that would require further changes in the shader.
cmd.Blit(m_ScreenSpaceShadowMapRT, m_ScreenSpaceShadowMapRT, m_ScreenSpaceShadowsMaterial);
LightweightUtils.StartStereoRendering(camera, ref context, frameRenderingConfiguration);
context.ExecuteCommandBuffer(cmd);
LightweightUtils.StopStereoRendering(camera, ref context, frameRenderingConfiguration);
CommandBufferPool.Release(cmd);
}
private void BuildShadowSettings(LightweightPipelineAsset pipelineAsset)
{
m_ShadowSettings = ShadowSettings.Default;
m_ShadowSettings.shadowType = (LightShadows)pipelineAsset.ShadowSetting;
m_ShadowSettings.screenSpace = SystemInfo.graphicsDeviceType != GraphicsDeviceType.OpenGLES2;
m_ShadowSettings.directionalLightCascadeCount = pipelineAsset.CascadeCount;
m_ShadowSettings.shadowAtlasWidth = pipelineAsset.ShadowAtlasResolution;
m_ShadowSettings.shadowAtlasHeight = pipelineAsset.ShadowAtlasResolution;
m_ShadowSettings.maxShadowDistance = pipelineAsset.ShadowDistance;
m_ShadowSettings.shadowmapTextureFormat = SystemInfo.SupportsRenderTextureFormat(RenderTextureFormat.Shadowmap)
? RenderTextureFormat.Shadowmap
: RenderTextureFormat.Depth;
m_ShadowSettings.screenspaceShadowmapTextureFormat = SystemInfo.SupportsRenderTextureFormat(RenderTextureFormat.R8)
? RenderTextureFormat.R8
: RenderTextureFormat.ARGB32;
switch (m_ShadowSettings.directionalLightCascadeCount)
{
case 1:
m_ShadowSettings.directionalLightCascades = new Vector3(1.0f, 0.0f, 0.0f);
break;
case 2:
m_ShadowSettings.directionalLightCascades = new Vector3(pipelineAsset.Cascade2Split, 1.0f, 0.0f);
break;
default:
m_ShadowSettings.directionalLightCascades = pipelineAsset.Cascade4Split;
break;
}
}
private void Clear()
{
m_DirectionalShadowmapRT = null;
m_AdditionalShadowmapRT = null;
m_ShadowSampling = LightShadows.None;
m_LocalLightShadowSampling = LightShadows.None;
for (int i = 0; i < kMaxLocalPixelLightPerPass; ++i)
{
m_LocalLightShadowMatrices[i] = Matrix4x4.identity;
m_LocalShadowStrength[i] = 0.0f;
}
}
private void SetShadowCollectPassKeywords(CommandBuffer cmd)
{
CoreUtils.SetKeyword(cmd, "_SHADOWS_SOFT", m_ShadowSampling == LightShadows.Soft);
CoreUtils.SetKeyword(cmd, "_SHADOWS_CASCADE", m_ShadowSettings.directionalLightCascadeCount > 1);
}
private bool RenderDirectionalCascadeShadowmap(ref CullResults cullResults, ref LightData lightData, ref ScriptableRenderContext context)
{
int shadowLightIndex = lightData.mainLightIndex;
if (shadowLightIndex == -1)
return false;
VisibleLight shadowLight = lightData.visibleLights[shadowLightIndex];
Light light = shadowLight.light;
Debug.Assert(shadowLight.lightType == LightType.Directional);
if (light.shadows == LightShadows.None)
return false;
CommandBuffer cmd = CommandBufferPool.Get("Prepare Directional Shadowmap");
m_ShadowCasterCascadesCount = m_ShadowSettings.directionalLightCascadeCount;
int shadowResolution = GetMaxTileResolutionInAtlas(m_ShadowSettings.shadowAtlasWidth, m_ShadowSettings.shadowAtlasHeight, m_ShadowCasterCascadesCount);
float shadowNearPlane = light.shadowNearPlane;
Bounds bounds;
if (!cullResults.GetShadowCasterBounds(shadowLightIndex, out bounds))
return false;
Matrix4x4 view, proj;
var settings = new DrawShadowsSettings(cullResults, shadowLightIndex);
RenderTextureDescriptor shadowmapDescriptor = new RenderTextureDescriptor(m_ShadowSettings.shadowAtlasWidth,
m_ShadowSettings.shadowAtlasHeight, m_ShadowSettings.shadowmapTextureFormat, kShadowBufferBits);
shadowmapDescriptor.shadowSamplingMode = ShadowSamplingMode.CompareDepths;
m_DirectionalShadowmapRT = RenderTexture.GetTemporary(shadowmapDescriptor);
m_DirectionalShadowmapRT.filterMode = FilterMode.Bilinear;
m_DirectionalShadowmapRT.wrapMode = TextureWrapMode.Clamp;
CoreUtils.SetRenderTarget(cmd, m_DirectionalShadowmapRT, ClearFlag.Depth);
bool success = false;
for (int cascadeIndex = 0; cascadeIndex < m_ShadowCasterCascadesCount; ++cascadeIndex)
{
success = cullResults.ComputeDirectionalShadowMatricesAndCullingPrimitives(shadowLightIndex,
cascadeIndex, m_ShadowCasterCascadesCount, m_ShadowSettings.directionalLightCascades, shadowResolution, shadowNearPlane, out view, out proj,
out settings.splitData);
float cullingSphereRadius = settings.splitData.cullingSphere.w;
m_DirectionalShadowSplitDistances[cascadeIndex] = settings.splitData.cullingSphere;
m_DirectionalShadowSplitRadii[cascadeIndex] = cullingSphereRadius * cullingSphereRadius;
if (!success)
break;
m_ShadowCascadeSlices[cascadeIndex].offsetX = (cascadeIndex % 2) * shadowResolution;
m_ShadowCascadeSlices[cascadeIndex].offsetY = (cascadeIndex / 2) * shadowResolution;
m_ShadowCascadeSlices[cascadeIndex].resolution = shadowResolution;
SetupShadowCasterConstants(cmd, ref shadowLight, proj, shadowResolution);
SetupShadowSliceTransform(ref m_ShadowCascadeSlices[cascadeIndex], m_ShadowSettings.shadowAtlasWidth, m_ShadowSettings.shadowAtlasHeight, proj, view);
RenderShadowSlice(cmd, ref context, ref m_ShadowCascadeSlices[cascadeIndex], proj, view, settings);
}
if (success)
{
m_ShadowSampling = (m_ShadowSettings.shadowType != LightShadows.Soft) ? LightShadows.Hard : light.shadows;
// In order to avoid shader variants explosion we only do hard shadows when sampling shadowmap in the lit pass.
// GLES2 platform is forced to hard single cascade shadows.
if (!m_ShadowSettings.screenSpace)
m_ShadowSampling = LightShadows.Hard;
SetupDirectionalShadowReceiverConstants(cmd, shadowLight, ref context);
}
context.ExecuteCommandBuffer(cmd);
CommandBufferPool.Release(cmd);
return success;
}
private void RenderLocalShadowmapAtlas(ref CullResults cullResults, ref LightData lightData, ref ScriptableRenderContext context)
{
List<int> localLightIndices = lightData.localLightIndices;
List<VisibleLight> visibleLights = lightData.visibleLights;
int shadowCastingLightsCount = 0;
for (int i = 0; i < localLightIndices.Count; ++i)
{
VisibleLight shadowLight = visibleLights[localLightIndices[i]];
if (shadowLight.lightType == LightType.Spot && shadowLight.light.shadows != LightShadows.None)
shadowCastingLightsCount++;
}
if (shadowCastingLightsCount == 0)
return;
CommandBuffer cmd = CommandBufferPool.Get("Prepare Local Lights Shadowmap");
Matrix4x4 view, proj;
Bounds bounds;
// TODO: Add support to point light shadows. We make a simplification here that only works
// for spot lights and with max spot shadows per pass.
int atlasWidth = m_LocalLightShadowAtlasResolution;
int atlasHeight = m_LocalLightShadowAtlasResolution;
int sliceResolution = GetMaxTileResolutionInAtlas(atlasWidth, atlasHeight, shadowCastingLightsCount);
int shadowSampling = 0;
RenderTextureDescriptor shadowmapDescriptor = new RenderTextureDescriptor(m_LocalLightShadowAtlasResolution, m_LocalLightShadowAtlasResolution, m_ShadowSettings.shadowmapTextureFormat, kShadowBufferBits);
shadowmapDescriptor.shadowSamplingMode = ShadowSamplingMode.CompareDepths;
m_AdditionalShadowmapRT = RenderTexture.GetTemporary(shadowmapDescriptor);
m_AdditionalShadowmapRT.filterMode = FilterMode.Bilinear;
m_AdditionalShadowmapRT.wrapMode = TextureWrapMode.Clamp;
CoreUtils.SetRenderTarget(cmd, m_AdditionalShadowmapRT, ClearFlag.Depth);
for (int i = 0; i < localLightIndices.Count; ++i)
{
int shadowLightIndex = localLightIndices[i];
VisibleLight shadowLight = visibleLights[shadowLightIndex];
Light light = shadowLight.light;
if (shadowLight.lightType != LightType.Spot || shadowLight.light.shadows == LightShadows.None)
continue;
if (!cullResults.GetShadowCasterBounds(shadowLightIndex, out bounds))
continue;
var settings = new DrawShadowsSettings(cullResults, shadowLightIndex);
if (cullResults.ComputeSpotShadowMatricesAndCullingPrimitives(shadowLightIndex, out view, out proj, out settings.splitData))
{
// This way of computing the shadow slice only work for spots and with most 4 shadow casting lights per pass
// Change this when point lights are supported.
Debug.Assert(kMaxLocalPixelLightPerPass == 4 && shadowLight.lightType == LightType.Spot);
m_LocalLightShadowSlices[i].offsetX = (i % 2) * sliceResolution;
m_LocalLightShadowSlices[i].offsetY = (i / 2) * sliceResolution;
m_LocalLightShadowSlices[i].resolution = sliceResolution;
SetupShadowCasterConstants(cmd, ref shadowLight, proj, sliceResolution);
SetupShadowSliceTransform(ref m_LocalLightShadowSlices[i], atlasWidth, atlasHeight, proj, view);
RenderShadowSlice(cmd, ref context, ref m_LocalLightShadowSlices[i], proj, view, settings);
m_LocalShadowStrength[i] = light.shadowStrength;
shadowSampling = Math.Max(shadowSampling, (int)light.shadows);
lightData.localShadowMask |= (1 << shadowLightIndex);
}
}
SetupLocalLightsShadowReceiverConstants(cmd, ref context);
m_LocalLightShadowSampling = (LightShadows)Math.Min(shadowSampling, (int)m_ShadowSettings.shadowType);
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
}
private void SetupShadowSliceTransform(ref ShadowSliceData shadowSliceData, int atlasWidth, int atlasHeight, Matrix4x4 proj, Matrix4x4 view)
{
// Currently CullResults ComputeDirectionalShadowMatricesAndCullingPrimitives doesn't
// apply z reversal to projection matrix. We need to do it manually here.
if (SystemInfo.usesReversedZBuffer)
{
proj.m20 = -proj.m20;
proj.m21 = -proj.m21;
proj.m22 = -proj.m22;
proj.m23 = -proj.m23;
}
Matrix4x4 worldToShadow = proj * view;
var textureScaleAndBias = Matrix4x4.identity;
textureScaleAndBias.m00 = 0.5f;
textureScaleAndBias.m11 = 0.5f;
textureScaleAndBias.m22 = 0.5f;
textureScaleAndBias.m03 = 0.5f;
textureScaleAndBias.m23 = 0.5f;
textureScaleAndBias.m13 = 0.5f;
// Apply texture scale and offset to save a MAD in shader.
worldToShadow = textureScaleAndBias * worldToShadow;
var cascadeAtlas = Matrix4x4.identity;
float oneOverAtlasWidth = 1.0f / atlasWidth;
float oneOverAtlasHeight = 1.0f / atlasHeight;
cascadeAtlas.m00 = shadowSliceData.resolution * oneOverAtlasWidth;
cascadeAtlas.m11 = shadowSliceData.resolution * oneOverAtlasHeight;
cascadeAtlas.m03 = shadowSliceData.offsetX * oneOverAtlasWidth;
cascadeAtlas.m13 = shadowSliceData.offsetY * oneOverAtlasHeight;
// Apply shadow slice scale and offset
worldToShadow = cascadeAtlas * worldToShadow;
shadowSliceData.shadowTransform = worldToShadow;
}
private void RenderShadowSlice(CommandBuffer cmd, ref ScriptableRenderContext context, ref ShadowSliceData shadowSliceData,
Matrix4x4 proj, Matrix4x4 view, DrawShadowsSettings settings)
{
cmd.SetViewport(new Rect(shadowSliceData.offsetX, shadowSliceData.offsetY, shadowSliceData.resolution, shadowSliceData.resolution));
cmd.EnableScissorRect(new Rect(shadowSliceData.offsetX + 4, shadowSliceData.offsetY + 4, shadowSliceData.resolution - 8, shadowSliceData.resolution - 8));
cmd.SetViewProjectionMatrices(view, proj);
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
context.DrawShadows(ref settings);
cmd.DisableScissorRect();
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
}
private int GetMaxTileResolutionInAtlas(int atlasWidth, int atlasHeight, int tileCount)
{
int resolution = Mathf.Min(atlasWidth, atlasHeight);
if (tileCount > Mathf.Log(resolution))
{
Debug.LogError(
String.Format(
"Cannot fit {0} tiles into current shadowmap atlas of size ({1}, {2}). ShadowMap Resolution set to zero.",
tileCount, atlasWidth, atlasHeight));
return 0;
}
int currentTileCount = atlasWidth / resolution * atlasHeight / resolution;
while (currentTileCount < tileCount)
{
resolution = resolution >> 1;
currentTileCount = atlasWidth / resolution * atlasHeight / resolution;
}
return resolution;
}
private void SetupShadowCasterConstants(CommandBuffer cmd, ref VisibleLight visibleLight, Matrix4x4 proj, float cascadeResolution)
{
Light light = visibleLight.light;
float bias = 0.0f;
float normalBias = 0.0f;
// Use same kernel radius as built-in pipeline so we can achieve same bias results
// with the default light bias parameters.
const float kernelRadius = 3.65f;
if (visibleLight.lightType == LightType.Directional)
{
// Scale bias by cascade's world space depth range.
// Directional shadow lights have orthogonal projection.
// proj.m22 = -2 / (far - near) since the projection's depth range is [-1.0, 1.0]
// In order to be correct we should multiply bias by 0.5 but this introducing aliasing along cascades more visible.
float sign = (SystemInfo.usesReversedZBuffer) ? 1.0f : -1.0f;
bias = light.shadowBias * proj.m22 * sign;
// Currently only square POT cascades resolutions are used.
// We scale normalBias
double frustumWidth = 2.0 / (double)proj.m00;
double frustumHeight = 2.0 / (double)proj.m11;
float texelSizeX = (float)(frustumWidth / (double)cascadeResolution);
float texelSizeY = (float)(frustumHeight / (double)cascadeResolution);
float texelSize = Mathf.Max(texelSizeX, texelSizeY);
// Since we are applying normal bias on caster side we want an inset normal offset
// thus we use a negative normal bias.
normalBias = -light.shadowNormalBias * texelSize * kernelRadius;
}
else if (visibleLight.lightType == LightType.Spot)
{
float sign = (SystemInfo.usesReversedZBuffer) ? -1.0f : 1.0f;
bias = light.shadowBias * sign;
normalBias = 0.0f;
}
else
{
Debug.LogWarning("Only spot and directional shadow casters are supported in lightweight pipeline");
}
Vector3 lightDirection = -visibleLight.localToWorld.GetColumn(2);
cmd.SetGlobalVector("_ShadowBias", new Vector4(bias, normalBias, 0.0f, 0.0f));
cmd.SetGlobalVector("_LightDirection", new Vector4(lightDirection.x, lightDirection.y, lightDirection.z, 0.0f));
}
private void SetupDirectionalShadowReceiverConstants(CommandBuffer cmd, VisibleLight shadowLight, ref ScriptableRenderContext context)
{
Light light = shadowLight.light;
int cascadeCount = m_ShadowCasterCascadesCount;
for (int i = 0; i < kMaxCascades; ++i)
m_ShadowMatrices[i] = (cascadeCount >= i) ? m_ShadowCascadeSlices[i].shadowTransform : Matrix4x4.identity;
// We setup and additional a no-op WorldToShadow matrix in the last index
// because the ComputeCascadeIndex function in Shadows.hlsl can return an index
// out of bounds. (position not inside any cascade) and we want to avoid branching
Matrix4x4 noOpShadowMatrix = Matrix4x4.zero;
noOpShadowMatrix.m33 = (SystemInfo.usesReversedZBuffer) ? 1.0f : 0.0f;
m_ShadowMatrices[kMaxCascades] = noOpShadowMatrix;
float invShadowAtlasWidth = 1.0f / m_ShadowSettings.shadowAtlasWidth;
float invShadowAtlasHeight = 1.0f / m_ShadowSettings.shadowAtlasHeight;
float invHalfShadowAtlasWidth = 0.5f * invShadowAtlasWidth;
float invHalfShadowAtlasHeight = 0.5f * invShadowAtlasHeight;
cmd.SetGlobalTexture(m_DirectionalShadowmapRTID, m_DirectionalShadowmapRT);
cmd.SetGlobalMatrixArray(DirectionalShadowConstantBuffer._WorldToShadow, m_ShadowMatrices);
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowData, new Vector4(light.shadowStrength, 0.0f, 0.0f, 0.0f));
cmd.SetGlobalVectorArray(DirectionalShadowConstantBuffer._DirShadowSplitSpheres, m_DirectionalShadowSplitDistances);
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._DirShadowSplitSphereRadii, m_DirectionalShadowSplitRadii);
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowOffset0, new Vector4(-invHalfShadowAtlasWidth, -invHalfShadowAtlasHeight, 0.0f, 0.0f));
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowOffset1, new Vector4( invHalfShadowAtlasWidth, -invHalfShadowAtlasHeight, 0.0f, 0.0f));
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowOffset2, new Vector4(-invHalfShadowAtlasWidth, invHalfShadowAtlasHeight, 0.0f, 0.0f));
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowOffset3, new Vector4( invHalfShadowAtlasWidth, invHalfShadowAtlasHeight, 0.0f, 0.0f));
cmd.SetGlobalVector(DirectionalShadowConstantBuffer._ShadowmapSize, new Vector4(invShadowAtlasWidth, invShadowAtlasHeight,
m_ShadowSettings.shadowAtlasWidth, m_ShadowSettings.shadowAtlasHeight));
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
}
private void SetupLocalLightsShadowReceiverConstants(CommandBuffer cmd, ref ScriptableRenderContext context)
{
for (int i = 0; i < kMaxLocalPixelLightPerPass; ++i)
m_LocalLightShadowMatrices[i] = m_LocalLightShadowSlices[i].shadowTransform;
float invShadowResolution = 1.0f / m_LocalLightShadowAtlasResolution;
float invHalfShadowResolution = 0.5f * invShadowResolution;
cmd.SetGlobalTexture(m_AdditionalShadowmapRTID, m_AdditionalShadowmapRT);
cmd.SetGlobalMatrixArray(LocalShadowConstantBuffer._LocalWorldToShadow, m_LocalLightShadowMatrices);
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowData, new Vector4(m_LocalShadowStrength[0], m_LocalShadowStrength[1], m_LocalShadowStrength[2], m_LocalShadowStrength[3]));
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset0, new Vector4(-invHalfShadowResolution, -invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset1, new Vector4( invHalfShadowResolution, -invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset2, new Vector4(-invHalfShadowResolution, invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowOffset3, new Vector4( invHalfShadowResolution, invHalfShadowResolution, 0.0f, 0.0f));
cmd.SetGlobalVector(LocalShadowConstantBuffer._LocalShadowmapSize, new Vector4(invShadowResolution, invShadowResolution, m_LocalLightShadowAtlasResolution, m_LocalLightShadowAtlasResolution));
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
}
};
};

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ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightShadowPass.cs.meta
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