using System; using System.Collections.Generic; using System.Diagnostics; using System.Text; using UnityEngine.Experimental.GlobalIllumination; using UnityEngine.Rendering; using UnityEngine.Rendering.PostProcessing; using UnityEngine.XR; namespace UnityEngine.Experimental.Rendering.LightweightPipeline { [Serializable] public class ShadowSettings { public bool enabled; public int shadowAtlasWidth; public int shadowAtlasHeight; public float maxShadowDistance; public int directionalLightCascadeCount; public Vector3 directionalLightCascades; public float directionalLightNearPlaneOffset; public RenderTextureFormat renderTextureFormat; static ShadowSettings defaultShadowSettings = null; public static ShadowSettings Default { get { if (defaultShadowSettings == null) { defaultShadowSettings = new ShadowSettings(); defaultShadowSettings.enabled = 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.renderTextureFormat = RenderTextureFormat.Shadowmap; } return defaultShadowSettings; } } } public struct ShadowSliceData { public Matrix4x4 shadowTransform; public int atlasX; public int atlasY; public int shadowResolution; } public struct LightData { public int pixelAdditionalLightsCount; public int totalAdditionalLightsCount; public int mainLightIndex; public LightShadows shadowMapSampleType; } public enum MixedLightingSetup { None = 0, ShadowMask, Subtractive, }; public static class CameraRenderTargetID { // Camera color target. Not used when camera is rendering to backbuffer or camera // is rendering to a texture (offscreen camera) public static int color; // Camera copy color texture. In case there is a single BeforeTransparent postFX // we need use copyColor RT as a work RT. public static int copyColor; // Camera depth target. Only used when post processing or soft particles are enabled. public static int depth; // If soft particles are enabled and no depth prepass is performed we need to copy depth. public static int depthCopy; } public class LightweightPipeline : RenderPipeline { private readonly LightweightPipelineAsset m_Asset; // 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; // Lights are culled per-object. This holds the maximum amount of lights that can be shaded per-object. // The engine fills in the lights indices per-object in unity4_LightIndices0 and unity_4LightIndices1 private static readonly int kMaxPerObjectLights = 8; private static readonly int kMaxVertexLights = 4; // We have no good approach exposed to skip shader variants, e.g, ideally we would like to skip _CASCADE for all punctual lights // We combine light and shadow classification keywords to reduce the amount of shader variants. // Lightweight shader library declares defines based on these keywords to avoid having to check them in the shaders // Core.hlsl defines _MAIN_LIGHT_DIRECTIONAL and _MAIN_LIGHT_SPOT (point lights can't be main light) // Shadow.hlsl defines _SHADOWS_ENABLED, _SHADOWS_SOFT, _SHADOWS_CASCADE, _SHADOWS_PERSPECTIVE private static readonly string[] kMainLightKeywords = { "_MAIN_LIGHT_DIRECTIONAL_SHADOW", "_MAIN_LIGHT_DIRECTIONAL_SHADOW_CASCADE", "_MAIN_LIGHT_DIRECTIONAL_SHADOW_SOFT", "_MAIN_LIGHT_DIRECTIONAL_SHADOW_CASCADE_SOFT", "_MAIN_LIGHT_SPOT_SHADOW", "_MAIN_LIGHT_SPOT_SHADOW_SOFT" }; private StringBuilder m_MainLightKeywordString = new StringBuilder(43); private bool m_IsOffscreenCamera; private Vector4 kDefaultLightPosition = new Vector4(0.0f, 0.0f, 1.0f, 0.0f); private Vector4 kDefaultLightColor = Color.black; private Vector4 kDefaultLightAttenuation = new Vector4(0.0f, 1.0f, 0.0f, 1.0f); private Vector4 kDefaultLightSpotDirection = new Vector4(0.0f, 0.0f, 1.0f, 0.0f); private Vector4 kDefaultLightSpotAttenuation = new Vector4(0.0f, 1.0f, 0.0f, 0.0f); private Vector4[] m_LightPositions = new Vector4[kMaxVisibleLights]; private Vector4[] m_LightColors = new Vector4[kMaxVisibleLights]; private Vector4[] m_LightDistanceAttenuations = new Vector4[kMaxVisibleLights]; private Vector4[] m_LightSpotDirections = new Vector4[kMaxVisibleLights]; private Vector4[] m_LightSpotAttenuations = new Vector4[kMaxVisibleLights]; private Camera m_CurrCamera; private const int kMaxCascades = 4; private int m_ShadowCasterCascadesCount; private int m_ShadowMapRTID; private Matrix4x4[] m_ShadowMatrices = new Matrix4x4[kMaxCascades + 1]; private RenderTargetIdentifier m_CurrCameraColorRT; private RenderTargetIdentifier m_ShadowMapRT; private RenderTargetIdentifier m_ColorRT; private RenderTargetIdentifier m_CopyColorRT; private RenderTargetIdentifier m_DepthRT; private RenderTargetIdentifier m_CopyDepth; private RenderTargetIdentifier m_Color; private bool m_IntermediateTextureArray; private bool m_RequireDepthTexture; private bool m_RequireCopyColor; private bool m_DepthRenderBuffer; private MixedLightingSetup m_MixedLightingSetup; private const int kDepthStencilBufferBits = 32; private Vector4[] m_DirectionalShadowSplitDistances = new Vector4[kMaxCascades]; private Vector4 m_DirectionalShadowSplitRadii; private ShadowSettings m_ShadowSettings = ShadowSettings.Default; private ShadowSliceData[] m_ShadowSlices = new ShadowSliceData[kMaxCascades]; // Pipeline pass names private static readonly ShaderPassName m_DepthPrepass = new ShaderPassName("DepthOnly"); private static readonly ShaderPassName m_LitPassName = new ShaderPassName("LightweightForward"); private static readonly ShaderPassName m_UnlitPassName = new ShaderPassName("SRPDefaultUnlit"); // Renders all shaders without a lightmode tag // Legacy pass names public static readonly ShaderPassName s_AlwaysName = new ShaderPassName("Always"); public static readonly ShaderPassName s_ForwardBaseName = new ShaderPassName("ForwardBase"); public static readonly ShaderPassName s_PrepassBaseName = new ShaderPassName("PrepassBase"); public static readonly ShaderPassName s_VertexName = new ShaderPassName("Vertex"); public static readonly ShaderPassName s_VertexLMRGBMName = new ShaderPassName("VertexLMRGBM"); public static readonly ShaderPassName s_VertexLMName = new ShaderPassName("VertexLM"); public static readonly ShaderPassName[] s_LegacyPassNames = { s_AlwaysName, s_ForwardBaseName, s_PrepassBaseName, s_VertexName, s_VertexLMRGBMName, s_VertexLMName }; private RenderTextureFormat m_ColorFormat; private PostProcessRenderContext m_PostProcessRenderContext; private PostProcessLayer m_CameraPostProcessLayer; private CameraComparer m_CameraComparer = new CameraComparer(); private LightComparer m_LightComparer = new LightComparer(); // Maps from sorted light indices to original unsorted. We need this for shadow rendering // and per-object light lists. private List m_SortedLightIndexMap = new List(); private Dictionary m_VisibleLightsIDMap = new Dictionary(new LightEqualityComparer()); private Mesh m_BlitQuad; private Material m_BlitMaterial; private Material m_CopyDepthMaterial; private Material m_ErrorMaterial; private int m_BlitTexID = Shader.PropertyToID("_BlitTex"); private CopyTextureSupport m_CopyTextureSupport; public LightweightPipeline(LightweightPipelineAsset asset) { m_Asset = asset; BuildShadowSettings(); SetRenderingFeatures(); PerFrameBuffer._GlossyEnvironmentColor = Shader.PropertyToID("_GlossyEnvironmentColor"); PerFrameBuffer._SubtractiveShadowColor = Shader.PropertyToID("_SubtractiveShadowColor"); // Lights are culled per-camera. Therefore we need to reset light buffers on each camera render PerCameraBuffer._MainLightPosition = Shader.PropertyToID("_MainLightPosition"); PerCameraBuffer._MainLightColor = Shader.PropertyToID("_MainLightColor"); PerCameraBuffer._MainLightDistanceAttenuation = Shader.PropertyToID("_MainLightDistanceAttenuation"); PerCameraBuffer._MainLightSpotDir = Shader.PropertyToID("_MainLightSpotDir"); PerCameraBuffer._MainLightSpotAttenuation = Shader.PropertyToID("_MainLightSpotAttenuation"); PerCameraBuffer._MainLightCookie = Shader.PropertyToID("_MainLightCookie"); PerCameraBuffer._WorldToLight = Shader.PropertyToID("_WorldToLight"); PerCameraBuffer._AdditionalLightCount = Shader.PropertyToID("_AdditionalLightCount"); PerCameraBuffer._AdditionalLightPosition = Shader.PropertyToID("_AdditionalLightPosition"); PerCameraBuffer._AdditionalLightColor = Shader.PropertyToID("_AdditionalLightColor"); PerCameraBuffer._AdditionalLightDistanceAttenuation = Shader.PropertyToID("_AdditionalLightDistanceAttenuation"); PerCameraBuffer._AdditionalLightSpotDir = Shader.PropertyToID("_AdditionalLightSpotDir"); PerCameraBuffer._AdditionalLightSpotAttenuation = Shader.PropertyToID("_AdditionalLightSpotAttenuation"); ShadowConstantBuffer._WorldToShadow = Shader.PropertyToID("_WorldToShadow"); ShadowConstantBuffer._ShadowData = Shader.PropertyToID("_ShadowData"); ShadowConstantBuffer._DirShadowSplitSpheres = Shader.PropertyToID("_DirShadowSplitSpheres"); ShadowConstantBuffer._DirShadowSplitSphereRadii = Shader.PropertyToID("_DirShadowSplitSphereRadii"); ShadowConstantBuffer._ShadowOffset0 = Shader.PropertyToID("_ShadowOffset0"); ShadowConstantBuffer._ShadowOffset1 = Shader.PropertyToID("_ShadowOffset1"); ShadowConstantBuffer._ShadowOffset2 = Shader.PropertyToID("_ShadowOffset2"); ShadowConstantBuffer._ShadowOffset3 = Shader.PropertyToID("_ShadowOffset3"); ShadowConstantBuffer._ShadowmapSize = Shader.PropertyToID("_ShadowmapSize"); m_ShadowMapRTID = Shader.PropertyToID("_ShadowMap"); CameraRenderTargetID.color = Shader.PropertyToID("_CameraColorRT"); CameraRenderTargetID.copyColor = Shader.PropertyToID("_CameraCopyColorRT"); CameraRenderTargetID.depth = Shader.PropertyToID("_CameraDepthTexture"); CameraRenderTargetID.depthCopy = Shader.PropertyToID("_CameraCopyDepthTexture"); m_ShadowMapRT = new RenderTargetIdentifier(m_ShadowMapRTID); m_ColorRT = new RenderTargetIdentifier(CameraRenderTargetID.color); m_CopyColorRT = new RenderTargetIdentifier(CameraRenderTargetID.copyColor); m_DepthRT = new RenderTargetIdentifier(CameraRenderTargetID.depth); m_CopyDepth = new RenderTargetIdentifier(CameraRenderTargetID.depthCopy); m_PostProcessRenderContext = new PostProcessRenderContext(); 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; Shader.globalRenderPipeline = "LightweightPipeline"; m_BlitQuad = LightweightUtils.CreateQuadMesh(false); m_BlitMaterial = CoreUtils.CreateEngineMaterial(m_Asset.BlitShader); m_CopyDepthMaterial = CoreUtils.CreateEngineMaterial(m_Asset.CopyDepthShader); m_ErrorMaterial = CoreUtils.CreateEngineMaterial("Hidden/InternalErrorShader"); } public override void Dispose() { base.Dispose(); Shader.globalRenderPipeline = ""; SupportedRenderingFeatures.active = new SupportedRenderingFeatures(); CoreUtils.Destroy(m_ErrorMaterial); CoreUtils.Destroy(m_CopyDepthMaterial); CoreUtils.Destroy(m_BlitMaterial); } private void SetRenderingFeatures() { #if UNITY_EDITOR SupportedRenderingFeatures.active = new SupportedRenderingFeatures() { reflectionProbeSupportFlags = SupportedRenderingFeatures.ReflectionProbeSupportFlags.None, defaultMixedLightingMode = SupportedRenderingFeatures.LightmapMixedBakeMode.Subtractive, supportedMixedLightingModes = SupportedRenderingFeatures.LightmapMixedBakeMode.Subtractive, supportedLightmapBakeTypes = LightmapBakeType.Baked | LightmapBakeType.Mixed, supportedLightmapsModes = LightmapsMode.CombinedDirectional | LightmapsMode.NonDirectional, rendererSupportsLightProbeProxyVolumes = false, rendererSupportsMotionVectors = false, rendererSupportsReceiveShadows = true, rendererSupportsReflectionProbes = true }; #endif } CullResults m_CullResults; public override void Render(ScriptableRenderContext context, Camera[] cameras) { base.Render(context, cameras); GraphicsSettings.lightsUseLinearIntensity = true; SetupPerFrameShaderConstants(); // Sort cameras array by camera depth Array.Sort(cameras, m_CameraComparer); foreach (Camera camera in cameras) { bool sceneViewCamera = camera.cameraType == CameraType.SceneView; bool stereoEnabled = XRSettings.isDeviceActive && !sceneViewCamera; m_CurrCamera = camera; m_IsOffscreenCamera = m_CurrCamera.targetTexture != null && m_CurrCamera.cameraType != CameraType.SceneView; ScriptableCullingParameters cullingParameters; if (!CullResults.GetCullingParameters(m_CurrCamera, stereoEnabled, out cullingParameters)) continue; cullingParameters.shadowDistance = Mathf.Min(m_ShadowSettings.maxShadowDistance, m_CurrCamera.farClipPlane); #if UNITY_EDITOR // Emit scene view UI if (sceneViewCamera) ScriptableRenderContext.EmitWorldGeometryForSceneView(camera); #endif CullResults.Cull(ref cullingParameters, context, ref m_CullResults); List visibleLights = m_CullResults.visibleLights; LightData lightData; InitializeLightData(visibleLights, out lightData); ShadowPass(visibleLights, ref context, ref lightData); FrameRenderingConfiguration frameRenderingConfiguration; SetupFrameRenderingConfiguration(out frameRenderingConfiguration, stereoEnabled); SetupIntermediateResources(frameRenderingConfiguration, ref context); // SetupCameraProperties does the following: // Setup Camera RenderTarget and Viewport // VR Camera Setup and SINGLE_PASS_STEREO props // Setup camera view, proj and their inv matrices. // Setup properties: _WorldSpaceCameraPos, _ProjectionParams, _ScreenParams, _ZBufferParams, unity_OrthoParams // Setup camera world clip planes props // setup HDR keyword // Setup global time properties (_Time, _SinTime, _CosTime) context.SetupCameraProperties(m_CurrCamera, stereoEnabled); if (LightweightUtils.HasFlag(frameRenderingConfiguration, FrameRenderingConfiguration.DepthPrePass)) DepthPass(ref context); ForwardPass(visibleLights, frameRenderingConfiguration, ref context, ref lightData, stereoEnabled); // Release temporary RT var cmd = CommandBufferPool.Get("After Camera Render"); cmd.ReleaseTemporaryRT(m_ShadowMapRTID); cmd.ReleaseTemporaryRT(CameraRenderTargetID.depthCopy); cmd.ReleaseTemporaryRT(CameraRenderTargetID.depth); cmd.ReleaseTemporaryRT(CameraRenderTargetID.color); cmd.ReleaseTemporaryRT(CameraRenderTargetID.copyColor); context.ExecuteCommandBuffer(cmd); CommandBufferPool.Release(cmd); context.Submit(); } } private void ShadowPass(List visibleLights, ref ScriptableRenderContext context, ref LightData lightData) { if (m_Asset.AreShadowsEnabled() && lightData.mainLightIndex != -1) { VisibleLight mainLight = visibleLights[lightData.mainLightIndex]; if (mainLight.light.shadows != LightShadows.None) { if (!LightweightUtils.IsSupportedShadowType(mainLight.lightType)) { Debug.LogWarning("Only directional and spot shadows are supported by LightweightPipeline."); return; } // There's no way to map shadow light indices. We need to pass in the original unsorted index. // If no additional lights then no light sorting is performed and the indices match. int shadowOriginalIndex = (lightData.totalAdditionalLightsCount > 0) ? GetLightUnsortedIndex(lightData.mainLightIndex) : lightData.mainLightIndex; bool shadowsRendered = RenderShadows(ref m_CullResults, ref mainLight, shadowOriginalIndex, ref context); if (shadowsRendered) { lightData.shadowMapSampleType = (m_Asset.ShadowSetting != ShadowType.SOFT_SHADOWS) ? LightShadows.Hard : mainLight.light.shadows; } else { lightData.shadowMapSampleType = LightShadows.None; } } } } private void DepthPass(ref ScriptableRenderContext context) { CommandBuffer cmd = CommandBufferPool.Get("Depth Prepass"); SetRenderTarget(cmd, m_DepthRT, ClearFlag.Depth); context.ExecuteCommandBuffer(cmd); CommandBufferPool.Release(cmd); var opaqueDrawSettings = new DrawRendererSettings(m_CurrCamera, m_DepthPrepass); opaqueDrawSettings.sorting.flags = SortFlags.CommonOpaque; var opaqueFilterSettings = new FilterRenderersSettings(true) { renderQueueRange = RenderQueueRange.opaque }; context.DrawRenderers(m_CullResults.visibleRenderers, ref opaqueDrawSettings, opaqueFilterSettings); } private void ForwardPass(List visibleLights, FrameRenderingConfiguration frameRenderingConfiguration, ref ScriptableRenderContext context, ref LightData lightData, bool stereoEnabled) { SetupShaderConstants(visibleLights, ref context, ref lightData); RendererConfiguration rendererSettings = GetRendererSettings(ref lightData); BeginForwardRendering(ref context, frameRenderingConfiguration); RenderOpaques(ref context, rendererSettings); AfterOpaque(ref context, frameRenderingConfiguration); RenderTransparents(ref context, rendererSettings); AfterTransparent(ref context, frameRenderingConfiguration); EndForwardRendering(ref context, frameRenderingConfiguration); } private void RenderOpaques(ref ScriptableRenderContext context, RendererConfiguration settings) { var opaqueDrawSettings = new DrawRendererSettings(m_CurrCamera, m_LitPassName); opaqueDrawSettings.SetShaderPassName(1, m_UnlitPassName); opaqueDrawSettings.sorting.flags = SortFlags.CommonOpaque; opaqueDrawSettings.rendererConfiguration = settings; var opaqueFilterSettings = new FilterRenderersSettings(true) { renderQueueRange = RenderQueueRange.opaque }; context.DrawRenderers(m_CullResults.visibleRenderers, ref opaqueDrawSettings, opaqueFilterSettings); // Render objects that did not match any shader pass with error shader RenderObjectsWithError(ref context, opaqueFilterSettings, SortFlags.None); if (m_CurrCamera.clearFlags == CameraClearFlags.Skybox) context.DrawSkybox(m_CurrCamera); } private void AfterOpaque(ref ScriptableRenderContext context, FrameRenderingConfiguration config) { if (!m_RequireDepthTexture) return; CommandBuffer cmd = CommandBufferPool.Get("After Opaque"); cmd.SetGlobalTexture(CameraRenderTargetID.depth, m_DepthRT); bool setRenderTarget = false; RenderTargetIdentifier depthRT = m_DepthRT; // TODO: There's currently an issue in the PostFX stack that has a one frame delay when an effect is enabled/disabled // when an effect is disabled, HasOpaqueOnlyEffects returns true in the first frame, however inside render the effect // state is update, causing RenderPostProcess here to not blit to FinalColorRT. Until the next frame the RT will have garbage. if (LightweightUtils.HasFlag(config, FrameRenderingConfiguration.BeforeTransparentPostProcess)) { // When only have one effect in the stack we blit to a work RT then blit it back to active color RT. // This seems like an extra blit but it saves us a depth copy/blit which has some corner cases like msaa depth resolve. if (m_RequireCopyColor) { RenderPostProcess(cmd, m_CurrCameraColorRT, m_CopyColorRT, true); cmd.Blit(m_CopyColorRT, m_CurrCameraColorRT); } else RenderPostProcess(cmd, m_CurrCameraColorRT, m_CurrCameraColorRT, true); setRenderTarget = true; SetRenderTarget(cmd, m_CurrCameraColorRT, m_DepthRT); } if (LightweightUtils.HasFlag(config, FrameRenderingConfiguration.DepthCopy)) { CopyTexture(cmd, m_DepthRT, m_CopyDepth, m_CopyDepthMaterial); depthRT = m_CopyDepth; setRenderTarget = true; } if (setRenderTarget) SetRenderTarget(cmd, m_CurrCameraColorRT, depthRT); context.ExecuteCommandBuffer(cmd); CommandBufferPool.Release(cmd); } private void RenderTransparents(ref ScriptableRenderContext context, RendererConfiguration config) { var transparentSettings = new DrawRendererSettings(m_CurrCamera, m_LitPassName); transparentSettings.SetShaderPassName(1, m_UnlitPassName); transparentSettings.sorting.flags = SortFlags.CommonTransparent; transparentSettings.rendererConfiguration = config; var transparentFilterSettings = new FilterRenderersSettings(true) { renderQueueRange = RenderQueueRange.transparent }; context.DrawRenderers(m_CullResults.visibleRenderers, ref transparentSettings, transparentFilterSettings); // Render objects that did not match any shader pass with error shader RenderObjectsWithError(ref context, transparentFilterSettings, SortFlags.None); } private void AfterTransparent(ref ScriptableRenderContext context, FrameRenderingConfiguration config) { if (!LightweightUtils.HasFlag(config, FrameRenderingConfiguration.PostProcess)) return; CommandBuffer cmd = CommandBufferPool.Get("After Transparent"); RenderPostProcess(cmd, m_CurrCameraColorRT, BuiltinRenderTextureType.CameraTarget, false); context.ExecuteCommandBuffer(cmd); CommandBufferPool.Release(cmd); } [Conditional("DEVELOPMENT_BUILD"), Conditional("UNITY_EDITOR")] private void RenderObjectsWithError(ref ScriptableRenderContext context, FilterRenderersSettings filterSettings, SortFlags sortFlags) { if (m_ErrorMaterial != null) { DrawRendererSettings errorSettings = new DrawRendererSettings(m_CurrCamera, s_LegacyPassNames[0]); for (int i = 1; i < s_LegacyPassNames.Length; ++i) errorSettings.SetShaderPassName(i, s_LegacyPassNames[i]); errorSettings.sorting.flags = sortFlags; errorSettings.rendererConfiguration = RendererConfiguration.None; errorSettings.SetOverrideMaterial(m_ErrorMaterial, 0); context.DrawRenderers(m_CullResults.visibleRenderers, ref errorSettings, filterSettings); } } private void BuildShadowSettings() { m_ShadowSettings = ShadowSettings.Default; m_ShadowSettings.directionalLightCascadeCount = m_Asset.CascadeCount; m_ShadowSettings.shadowAtlasWidth = m_Asset.ShadowAtlasResolution; m_ShadowSettings.shadowAtlasHeight = m_Asset.ShadowAtlasResolution; m_ShadowSettings.maxShadowDistance = m_Asset.ShadowDistance; m_ShadowSettings.renderTextureFormat = SystemInfo.SupportsRenderTextureFormat(RenderTextureFormat.Shadowmap) ? RenderTextureFormat.Shadowmap : RenderTextureFormat.Depth; 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 stereoEnabled) { configuration = (stereoEnabled) ? FrameRenderingConfiguration.Stereo : FrameRenderingConfiguration.None; if (stereoEnabled && XRSettings.eyeTextureDesc.dimension == TextureDimension.Tex2DArray) m_IntermediateTextureArray = true; else m_IntermediateTextureArray = false; bool hdrEnabled = m_Asset.SupportsHDR && m_CurrCamera.allowHDR; bool intermediateTexture = m_CurrCamera.targetTexture != null || m_CurrCamera.cameraType == CameraType.SceneView || m_Asset.RenderScale < 1.0f || hdrEnabled; m_ColorFormat = hdrEnabled ? RenderTextureFormat.DefaultHDR : RenderTextureFormat.Default; m_RequireCopyColor = false; m_DepthRenderBuffer = false; m_CameraPostProcessLayer = m_CurrCamera.GetComponent(); bool msaaEnabled = m_CurrCamera.allowMSAA && m_Asset.MSAASampleCount > 1 && (m_CurrCamera.targetTexture == null || m_CurrCamera.targetTexture.antiAliasing > 1); // TODO: PostProcessing and SoftParticles are currently not support for VR bool postProcessEnabled = m_CameraPostProcessLayer != null && m_CameraPostProcessLayer.enabled && !stereoEnabled; m_RequireDepthTexture = m_Asset.RequireDepthTexture && !stereoEnabled; if (postProcessEnabled) { m_RequireDepthTexture = true; intermediateTexture = true; configuration |= FrameRenderingConfiguration.PostProcess; if (m_CameraPostProcessLayer.HasOpaqueOnlyEffects(m_PostProcessRenderContext)) { configuration |= FrameRenderingConfiguration.BeforeTransparentPostProcess; if (m_CameraPostProcessLayer.sortedBundles[PostProcessEvent.BeforeTransparent].Count == 1) m_RequireCopyColor = true; } } if (msaaEnabled) { configuration |= FrameRenderingConfiguration.Msaa; intermediateTexture = intermediateTexture || !LightweightUtils.PlatformSupportsMSAABackBuffer(); } if (m_RequireDepthTexture) { // If msaa is enabled we don't use a depth renderbuffer as we might not have support to Texture2DMS to resolve depth. // Instead we use a depth prepass and whenever depth is needed we use the 1 sample depth from prepass. if (!msaaEnabled) { bool supportsDepthCopy = m_CopyTextureSupport != CopyTextureSupport.None && m_Asset.CopyDepthShader.isSupported; m_DepthRenderBuffer = true; intermediateTexture = true; // If requiring a camera depth texture we need separate depth as it reads/write to depth at same time // Post process doesn't need the copy if (!m_Asset.RequireDepthTexture && postProcessEnabled) configuration |= (supportsDepthCopy) ? FrameRenderingConfiguration.DepthCopy : FrameRenderingConfiguration.DepthPrePass; } else { configuration |= FrameRenderingConfiguration.DepthPrePass; } } Rect cameraRect = m_CurrCamera.rect; if (!(Math.Abs(cameraRect.x) > 0.0f || Math.Abs(cameraRect.y) > 0.0f || Math.Abs(cameraRect.width) < 1.0f || Math.Abs(cameraRect.height) < 1.0f)) configuration |= FrameRenderingConfiguration.DefaultViewport; else intermediateTexture = true; if (intermediateTexture) configuration |= FrameRenderingConfiguration.IntermediateTexture; } private void SetupIntermediateResources(FrameRenderingConfiguration renderingConfig, ref ScriptableRenderContext context) { CommandBuffer cmd = CommandBufferPool.Get("Setup Intermediate Resources"); int msaaSamples = (m_IsOffscreenCamera) ? Math.Min(m_CurrCamera.targetTexture.antiAliasing, m_Asset.MSAASampleCount) : m_Asset.MSAASampleCount; msaaSamples = (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.Msaa)) ? msaaSamples : 1; m_CurrCameraColorRT = BuiltinRenderTextureType.CameraTarget; if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.IntermediateTexture)) { if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.Stereo)) SetupIntermediateResourcesStereo(cmd, msaaSamples); else SetupIntermediateResourcesSingle(cmd, renderingConfig, msaaSamples); } context.ExecuteCommandBuffer(cmd); CommandBufferPool.Release(cmd); } private void SetupIntermediateResourcesSingle(CommandBuffer cmd, FrameRenderingConfiguration renderingConfig, int msaaSamples) { float renderScale = (m_CurrCamera.cameraType == CameraType.Game) ? m_Asset.RenderScale : 1.0f; int rtWidth = (int)((float)m_CurrCamera.pixelWidth * renderScale); int rtHeight = (int)((float)m_CurrCamera.pixelHeight * renderScale); if (m_RequireDepthTexture) { RenderTextureDescriptor depthRTDesc = new RenderTextureDescriptor(rtWidth, rtHeight, RenderTextureFormat.Depth, kDepthStencilBufferBits); cmd.GetTemporaryRT(CameraRenderTargetID.depth, depthRTDesc, FilterMode.Bilinear); if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.DepthCopy)) cmd.GetTemporaryRT(CameraRenderTargetID.depthCopy, depthRTDesc, FilterMode.Bilinear); } RenderTextureDescriptor colorRTDesc = new RenderTextureDescriptor(rtWidth, rtHeight, m_ColorFormat, kDepthStencilBufferBits); colorRTDesc.msaaSamples = msaaSamples; colorRTDesc.enableRandomWrite = false; // When offscreen camera current rendertarget is CameraTarget if (!m_IsOffscreenCamera) { cmd.GetTemporaryRT(CameraRenderTargetID.color, colorRTDesc, FilterMode.Bilinear); m_CurrCameraColorRT = m_ColorRT; } // When BeforeTransparent PostFX is enabled and only one effect is in the stack we need to create a temp // color RT to blit the effect. if (m_RequireCopyColor) cmd.GetTemporaryRT(CameraRenderTargetID.copyColor, colorRTDesc, FilterMode.Point); } private void SetupIntermediateResourcesStereo(CommandBuffer cmd, int msaaSamples) { RenderTextureDescriptor rtDesc = new RenderTextureDescriptor(); rtDesc = XRSettings.eyeTextureDesc; rtDesc.colorFormat = m_ColorFormat; rtDesc.msaaSamples = msaaSamples; cmd.GetTemporaryRT(CameraRenderTargetID.color, rtDesc, FilterMode.Bilinear); } private void SetupShaderConstants(List visibleLights, ref ScriptableRenderContext context, ref LightData lightData) { CommandBuffer cmd = CommandBufferPool.Get("SetupShaderConstants"); SetupShaderLightConstants(cmd, visibleLights, ref lightData); SetShaderKeywords(cmd, ref lightData, visibleLights); context.ExecuteCommandBuffer(cmd); CommandBufferPool.Release(cmd); } private void InitializeLightData(List visibleLights, out LightData lightData) { int visibleLightsCount = Math.Min(visibleLights.Count, m_Asset.MaxPixelLights); m_SortedLightIndexMap.Clear(); lightData.shadowMapSampleType = LightShadows.None; if (visibleLightsCount <= 1) lightData.mainLightIndex = GetMainLight(visibleLights); else lightData.mainLightIndex = SortLights(visibleLights); // If we have a main light we don't shade it in the per-object light loop. We also remove it from the per-object cull list int mainLightPresent = (lightData.mainLightIndex >= 0) ? 1 : 0; int additionalPixelLightsCount = visibleLightsCount - mainLightPresent; int vertexLightCount = (m_Asset.SupportsVertexLight) ? Math.Min(visibleLights.Count, kMaxPerObjectLights) - additionalPixelLightsCount - mainLightPresent : 0; vertexLightCount = Math.Min(vertexLightCount, kMaxVertexLights); lightData.pixelAdditionalLightsCount = additionalPixelLightsCount; lightData.totalAdditionalLightsCount = additionalPixelLightsCount + vertexLightCount; m_MixedLightingSetup = MixedLightingSetup.None; } private int SortLights(List visibleLights) { int totalVisibleLights = visibleLights.Count; m_VisibleLightsIDMap.Clear(); for (int i = 0; i < totalVisibleLights; ++i) m_VisibleLightsIDMap.Add(visibleLights[i], i); // Sorts light so we have all directionals first, then local lights. // Directionals are sorted further by shadow, cookie and intensity // Locals are sorted further by shadow, cookie and distance to camera m_LightComparer.CurrCamera = m_CurrCamera; visibleLights.Sort(m_LightComparer); for (int i = 0; i < totalVisibleLights; ++i) m_SortedLightIndexMap.Add(m_VisibleLightsIDMap[visibleLights[i]]); return GetMainLight(visibleLights); } // How main light is decided: // If shadows enabled, main light is always a shadow casting light. Directional has priority over local lights. // Otherwise directional lights have priority based on cookie support and intensity private int GetMainLight(List visibleLights) { int totalVisibleLights = visibleLights.Count; bool shadowsEnabled = m_Asset.AreShadowsEnabled(); if (totalVisibleLights == 0 || m_Asset.MaxPixelLights == 0) return -1; int brighestDirectionalIndex = -1; for (int i = 0; i < totalVisibleLights; ++i) { VisibleLight currLight = visibleLights[i]; // Particle system lights have the light property as null. We sort lights so all particles lights // come last. Therefore, if first light is particle light then all lights are particle lights. // In this case we either have no main light or already found it. if (currLight.light == null) break; // Shadow lights are sorted by type (directional > puctual) and intensity // The first shadow light we find in the list is the main light if (shadowsEnabled && currLight.light.shadows != LightShadows.None && LightweightUtils.IsSupportedShadowType(currLight.lightType)) return i; // In case no shadow light is present we will return the brightest directional light if (currLight.lightType == LightType.Directional && brighestDirectionalIndex == -1) brighestDirectionalIndex = i; } return brighestDirectionalIndex; } private void InitializeLightConstants(List lights, int lightIndex, out Vector4 lightPos, out Vector4 lightColor, out Vector4 lightDistanceAttenuation, out Vector4 lightSpotDir, out Vector4 lightSpotAttenuation) { lightPos = kDefaultLightPosition; lightColor = kDefaultLightColor; lightDistanceAttenuation = kDefaultLightSpotAttenuation; lightSpotDir = kDefaultLightSpotDirection; lightSpotAttenuation = kDefaultLightAttenuation; // When no lights are visible, main light will be set to -1. // In this case we initialize it to default values and return if (lightIndex < 0) return; VisibleLight lightData = lights[lightIndex]; if (lightData.lightType == LightType.Directional) { Vector4 dir = -lightData.localToWorld.GetColumn(2); lightPos = new Vector4(dir.x, dir.y, dir.z, 0.0f); } else { Vector4 pos = lightData.localToWorld.GetColumn(3); lightPos = new Vector4(pos.x, pos.y, pos.z, 1.0f); } // VisibleLight.finalColor already returns color in active color space lightColor = lightData.finalColor; // Directional Light attenuation is initialize so distance attenuation always be 1.0 if (lightData.lightType != LightType.Directional) { // Light attenuation in lightweight matches the unity vanilla one. // attenuation = 1.0 / 1.0 + distanceToLightSqr * quadraticAttenuation // then a smooth factor is applied to linearly fade attenuation to light range // the attenuation smooth factor starts having effect at 80% of light range // smoothFactor = (lightRangeSqr - distanceToLightSqr) / (lightRangeSqr - fadeStartDistanceSqr) // We rewrite smoothFactor to be able to pre compute the constant terms below and apply the smooth factor // with one MAD instruction // smoothFactor = distanceSqr * (1.0 / (fadeDistanceSqr - lightRangeSqr)) + (-lightRangeSqr / (fadeDistanceSqr - lightRangeSqr) // distanceSqr * oneOverFadeRangeSqr + lightRangeSqrOverFadeRangeSqr float lightRangeSqr = lightData.range * lightData.range; float fadeStartDistanceSqr = 0.8f * 0.8f * lightRangeSqr; float fadeRangeSqr = (fadeStartDistanceSqr - lightRangeSqr); float oneOverFadeRangeSqr = 1.0f / fadeRangeSqr; float lightRangeSqrOverFadeRangeSqr = -lightRangeSqr / fadeRangeSqr; float quadAtten = 25.0f / lightRangeSqr; lightDistanceAttenuation = new Vector4(quadAtten, oneOverFadeRangeSqr, lightRangeSqrOverFadeRangeSqr, 1.0f); } if (lightData.lightType == LightType.Spot) { Vector4 dir = lightData.localToWorld.GetColumn(2); lightSpotDir = new Vector4(-dir.x, -dir.y, -dir.z, 0.0f); // Spot Attenuation with a linear falloff can be defined as // (SdotL - cosOuterAngle) / (cosInnerAngle - cosOuterAngle) // This can be rewritten as // invAngleRange = 1.0 / (cosInnerAngle - cosOuterAngle) // SdotL * invAngleRange + (-cosOuterAngle * invAngleRange) // If we precompute the terms in a MAD instruction float cosOuterAngle = Mathf.Cos(Mathf.Deg2Rad * lightData.spotAngle * 0.5f); float cosInneAngle = Mathf.Cos(LightmapperUtils.ExtractInnerCone(lightData.light) * 0.5f); float smoothAngleRange = Mathf.Max(0.001f, cosInneAngle - cosOuterAngle); float invAngleRange = 1.0f / smoothAngleRange; float add = -cosOuterAngle * invAngleRange; lightSpotAttenuation = new Vector4(invAngleRange, add, 0.0f); } Light light = lightData.light; // TODO: Add support to shadow mask if (light != null && light.bakingOutput.mixedLightingMode == MixedLightingMode.Subtractive && light.bakingOutput.lightmapBakeType == LightmapBakeType.Mixed) { if (m_MixedLightingSetup == MixedLightingSetup.None && lightData.light.shadows != LightShadows.None) { m_MixedLightingSetup = MixedLightingSetup.Subtractive; lightDistanceAttenuation.w = 0.0f; } } } private void SetupPerFrameShaderConstants() { // When glossy reflections are OFF in the shader we set a constant color to use as indirect specular SphericalHarmonicsL2 ambientSH = RenderSettings.ambientProbe; Color linearGlossyEnvColor = new Color(ambientSH[0, 0], ambientSH[1, 0], ambientSH[2, 0]) * RenderSettings.reflectionIntensity; Color glossyEnvColor = CoreUtils.ConvertLinearToActiveColorSpace(linearGlossyEnvColor); Shader.SetGlobalVector(PerFrameBuffer._GlossyEnvironmentColor, glossyEnvColor); // Used when subtractive mode is selected Shader.SetGlobalVector(PerFrameBuffer._SubtractiveShadowColor, CoreUtils.ConvertSRGBToActiveColorSpace(RenderSettings.subtractiveShadowColor)); } private void SetupShaderLightConstants(CommandBuffer cmd, List lights, ref LightData lightData) { // Main light has an optimized shader path for main light. This will benefit games that only care about a single light. // Lightweight pipeline also supports only a single shadow light, if available it will be the main light. SetupMainLightConstants(cmd, lights, lightData.mainLightIndex); if (lightData.shadowMapSampleType != LightShadows.None) SetupShadowReceiverConstants(cmd, lights[lightData.mainLightIndex]); SetupAdditionalListConstants(cmd, lights, ref lightData); } private void SetupMainLightConstants(CommandBuffer cmd, List lights, int lightIndex) { Vector4 lightPos, lightColor, lightDistanceAttenuation, lightSpotDir, lightSpotAttenuation; InitializeLightConstants(lights, lightIndex, out lightPos, out lightColor, out lightDistanceAttenuation, out lightSpotDir, out lightSpotAttenuation); if (lightIndex >= 0) { LightType mainLightType = lights[lightIndex].lightType; Light mainLight = lights[lightIndex].light; if (LightweightUtils.IsSupportedCookieType(mainLightType) && mainLight.cookie != null) { Matrix4x4 lightCookieMatrix; LightweightUtils.GetLightCookieMatrix(lights[lightIndex], out lightCookieMatrix); cmd.SetGlobalTexture(PerCameraBuffer._MainLightCookie, mainLight.cookie); cmd.SetGlobalMatrix(PerCameraBuffer._WorldToLight, lightCookieMatrix); } } cmd.SetGlobalVector(PerCameraBuffer._MainLightPosition, lightPos); cmd.SetGlobalVector(PerCameraBuffer._MainLightColor, lightColor); cmd.SetGlobalVector(PerCameraBuffer._MainLightDistanceAttenuation, lightDistanceAttenuation); cmd.SetGlobalVector(PerCameraBuffer._MainLightSpotDir, lightSpotDir); cmd.SetGlobalVector(PerCameraBuffer._MainLightSpotAttenuation, lightSpotAttenuation); } private void SetupAdditionalListConstants(CommandBuffer cmd, List lights, ref LightData lightData) { int additionalLightIndex = 0; if (lightData.totalAdditionalLightsCount > 0) { // We need to update per-object light list with the proper map to our global additional light buffer // First we initialize all lights in the map to -1 to tell the system to discard main light index and // remaining lights in the scene that don't fit the max additional light buffer (kMaxVisibileAdditionalLights) int[] perObjectLightIndexMap = m_CullResults.GetLightIndexMap(); for (int i = 0; i < lights.Count; ++i) perObjectLightIndexMap[i] = -1; for (int i = 0; i < lights.Count && additionalLightIndex < kMaxVisibleLights; ++i) { if (i != lightData.mainLightIndex) { // The engine performs per-object light culling and initialize 8 light indices into two vec4 constants unity_4LightIndices0 and unity_4LightIndices1. // In the shader we iterate over each visible light using the indices provided in these constants to index our global light buffer // ex: first light position would be m_LightPosisitions[unity_4LightIndices[0]]; // However since we sorted the lights we need to tell the engine how to map the original/unsorted indices to our global buffer // We do it by settings the perObjectLightIndexMap to the appropriate additionalLightIndex. perObjectLightIndexMap[GetLightUnsortedIndex(i)] = additionalLightIndex; InitializeLightConstants(lights, i, out m_LightPositions[additionalLightIndex], out m_LightColors[additionalLightIndex], out m_LightDistanceAttenuations[additionalLightIndex], out m_LightSpotDirections[additionalLightIndex], out m_LightSpotAttenuations[additionalLightIndex]); additionalLightIndex++; } } m_CullResults.SetLightIndexMap(perObjectLightIndexMap); cmd.SetGlobalVector(PerCameraBuffer._AdditionalLightCount, new Vector4(lightData.pixelAdditionalLightsCount, lightData.totalAdditionalLightsCount, 0.0f, 0.0f)); } else { cmd.SetGlobalVector(PerCameraBuffer._AdditionalLightCount, Vector4.zero); // Clear to default all light cosntant data for (int i = 0; i < kMaxVisibleLights; ++i) InitializeLightConstants(lights, -1, out m_LightPositions[additionalLightIndex], out m_LightColors[additionalLightIndex], out m_LightDistanceAttenuations[additionalLightIndex], out m_LightSpotDirections[additionalLightIndex], out m_LightSpotAttenuations[additionalLightIndex]); } cmd.SetGlobalVectorArray(PerCameraBuffer._AdditionalLightPosition, m_LightPositions); cmd.SetGlobalVectorArray(PerCameraBuffer._AdditionalLightColor, m_LightColors); cmd.SetGlobalVectorArray(PerCameraBuffer._AdditionalLightDistanceAttenuation, m_LightDistanceAttenuations); cmd.SetGlobalVectorArray(PerCameraBuffer._AdditionalLightSpotDir, m_LightSpotDirections); 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 SetupShadowReceiverConstants(CommandBuffer cmd, VisibleLight shadowLight) { Light light = shadowLight.light; int cascadeCount = m_ShadowCasterCascadesCount; for (int i = 0; i < kMaxCascades; ++i) m_ShadowMatrices[i] = (cascadeCount >= i) ? m_ShadowSlices[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.SetGlobalMatrixArray(ShadowConstantBuffer._WorldToShadow, m_ShadowMatrices); cmd.SetGlobalVector(ShadowConstantBuffer._ShadowData, new Vector4(light.shadowStrength, 0.0f, 0.0f, 0.0f)); cmd.SetGlobalVectorArray(ShadowConstantBuffer._DirShadowSplitSpheres, m_DirectionalShadowSplitDistances); cmd.SetGlobalVector(ShadowConstantBuffer._DirShadowSplitSphereRadii, m_DirectionalShadowSplitRadii); cmd.SetGlobalVector(ShadowConstantBuffer._ShadowOffset0, new Vector4(-invHalfShadowResolution, -invHalfShadowResolution, 0.0f, 0.0f)); cmd.SetGlobalVector(ShadowConstantBuffer._ShadowOffset1, new Vector4( invHalfShadowResolution, -invHalfShadowResolution, 0.0f, 0.0f)); cmd.SetGlobalVector(ShadowConstantBuffer._ShadowOffset2, new Vector4(-invHalfShadowResolution, invHalfShadowResolution, 0.0f, 0.0f)); cmd.SetGlobalVector(ShadowConstantBuffer._ShadowOffset3, new Vector4( invHalfShadowResolution, invHalfShadowResolution, 0.0f, 0.0f)); cmd.SetGlobalVector(ShadowConstantBuffer._ShadowmapSize, new Vector4(invShadowResolution, invShadowResolution, m_Asset.ShadowAtlasResolution, m_Asset.ShadowAtlasResolution)); } private void SetShaderKeywords(CommandBuffer cmd, ref LightData lightData, List visibleLights) { int vertexLightsCount = lightData.totalAdditionalLightsCount - lightData.pixelAdditionalLightsCount; int mainLightIndex = lightData.mainLightIndex; for (int i = 0; i < kMainLightKeywords.Length; ++i) cmd.DisableShaderKeyword(kMainLightKeywords[i]); if (mainLightIndex != -1 && (lightData.shadowMapSampleType != LightShadows.None)) { m_MainLightKeywordString.Length = 0; m_MainLightKeywordString.Append("_MAIN_LIGHT"); LightType mainLightType = visibleLights[mainLightIndex].lightType; if (mainLightType == LightType.Directional) { m_MainLightKeywordString.Append("_DIRECTIONAL_SHADOW"); if (m_Asset.CascadeCount > 1) m_MainLightKeywordString.Append("_CASCADE"); } else { m_MainLightKeywordString.Append("_SPOT_SHADOW"); } if (lightData.shadowMapSampleType == LightShadows.Soft) m_MainLightKeywordString.Append("_SOFT"); string keyword = m_MainLightKeywordString.ToString(); cmd.EnableShaderKeyword(keyword); } CoreUtils.SetKeyword(cmd, "_MAIN_LIGHT_COOKIE", mainLightIndex != -1 && LightweightUtils.IsSupportedCookieType(visibleLights[mainLightIndex].lightType) && visibleLights[mainLightIndex].light.cookie != null); CoreUtils.SetKeyword(cmd, "_ADDITIONAL_LIGHTS", lightData.totalAdditionalLightsCount > 0); CoreUtils.SetKeyword(cmd, "_MIXED_LIGHTING_SUBTRACTIVE", m_MixedLightingSetup == MixedLightingSetup.Subtractive); CoreUtils.SetKeyword(cmd, "_VERTEX_LIGHTS", vertexLightsCount > 0); CoreUtils.SetKeyword(cmd, "SOFTPARTICLES_ON", m_RequireDepthTexture && m_Asset.RequireSoftParticles); bool linearFogModeEnabled = false; bool exponentialFogModeEnabled = false; if (RenderSettings.fog) { if (RenderSettings.fogMode == FogMode.Linear) linearFogModeEnabled = true; else exponentialFogModeEnabled = true; } CoreUtils.SetKeyword(cmd, "FOG_LINEAR", linearFogModeEnabled); CoreUtils.SetKeyword(cmd, "FOG_EXP2", exponentialFogModeEnabled); } private bool RenderShadows(ref CullResults cullResults, ref VisibleLight shadowLight, int shadowLightIndex, ref ScriptableRenderContext context) { m_ShadowCasterCascadesCount = m_ShadowSettings.directionalLightCascadeCount; if (shadowLight.lightType == LightType.Spot) m_ShadowCasterCascadesCount = 1; int shadowResolution = GetMaxTileResolutionInAtlas(m_ShadowSettings.shadowAtlasWidth, m_ShadowSettings.shadowAtlasHeight, m_ShadowCasterCascadesCount); Bounds bounds; if (!cullResults.GetShadowCasterBounds(shadowLightIndex, out bounds)) return false; float shadowNearPlane = m_Asset.ShadowNearOffset; Matrix4x4 view, proj; var settings = new DrawShadowsSettings(cullResults, shadowLightIndex); bool success = false; var cmd = CommandBufferPool.Get("Prepare Shadowmap"); cmd.GetTemporaryRT(m_ShadowMapRTID, m_ShadowSettings.shadowAtlasWidth, m_ShadowSettings.shadowAtlasHeight, kDepthStencilBufferBits, FilterMode.Bilinear, m_ShadowSettings.renderTextureFormat); SetRenderTarget(cmd, m_ShadowMapRT, ClearFlag.Depth); if (shadowLight.lightType == LightType.Spot) { success = cullResults.ComputeSpotShadowMatricesAndCullingPrimitives(shadowLightIndex, out view, out proj, out settings.splitData); if (success) { SetupShadowCasterConstants(cmd, ref shadowLight, proj, shadowResolution); SetupShadowSliceTransform(0, shadowResolution, proj, view); RenderShadowSlice(cmd, ref context, 0, proj, view, settings); } } else if (shadowLight.lightType == LightType.Directional) { for (int cascadeIdx = 0; cascadeIdx < m_ShadowCasterCascadesCount; ++cascadeIdx) { success = cullResults.ComputeDirectionalShadowMatricesAndCullingPrimitives(shadowLightIndex, cascadeIdx, m_ShadowCasterCascadesCount, m_ShadowSettings.directionalLightCascades, shadowResolution, shadowNearPlane, out view, out proj, out settings.splitData); float cullingSphereRadius = settings.splitData.cullingSphere.w; m_DirectionalShadowSplitDistances[cascadeIdx] = settings.splitData.cullingSphere; m_DirectionalShadowSplitRadii[cascadeIdx] = cullingSphereRadius * cullingSphereRadius; if (!success) break; SetupShadowCasterConstants(cmd, ref shadowLight, proj, shadowResolution); SetupShadowSliceTransform(cascadeIdx, shadowResolution, proj, view); RenderShadowSlice(cmd, ref context, cascadeIdx, proj, view, settings); } } else { Debug.LogWarning("Only spot and directional shadow casters are supported in lightweight pipeline"); } CommandBufferPool.Release(cmd); return success; } private void SetupShadowSliceTransform(int cascadeIndex, int shadowResolution, Matrix4x4 proj, Matrix4x4 view) { if (cascadeIndex >= kMaxCascades) { Debug.LogError(String.Format("{0} is an invalid cascade index. Maximum of {1} cascades", cascadeIndex, kMaxCascades)); return; } int atlasX = (cascadeIndex % 2) * shadowResolution; int atlasY = (cascadeIndex / 2) * shadowResolution; float atlasWidth = (float)m_ShadowSettings.shadowAtlasWidth; float atlasHeight = (float)m_ShadowSettings.shadowAtlasHeight; // 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; cascadeAtlas.m00 = (float)shadowResolution / atlasWidth; cascadeAtlas.m11 = (float)shadowResolution / atlasHeight; cascadeAtlas.m03 = (float)atlasX / atlasWidth; cascadeAtlas.m13 = (float)atlasY / atlasHeight; // Apply cascade scale and offset worldToShadow = cascadeAtlas * worldToShadow; m_ShadowSlices[cascadeIndex].atlasX = atlasX; m_ShadowSlices[cascadeIndex].atlasY = atlasY; m_ShadowSlices[cascadeIndex].shadowResolution = shadowResolution; m_ShadowSlices[cascadeIndex].shadowTransform = worldToShadow; } private void RenderShadowSlice(CommandBuffer cmd, ref ScriptableRenderContext context, int cascadeIndex, Matrix4x4 proj, Matrix4x4 view, DrawShadowsSettings settings) { cmd.SetViewport(new Rect(m_ShadowSlices[cascadeIndex].atlasX, m_ShadowSlices[cascadeIndex].atlasY, m_ShadowSlices[cascadeIndex].shadowResolution, m_ShadowSlices[cascadeIndex].shadowResolution)); cmd.SetViewProjectionMatrices(view, proj); context.ExecuteCommandBuffer(cmd); context.DrawShadows(ref settings); 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 BeginForwardRendering(ref ScriptableRenderContext context, FrameRenderingConfiguration renderingConfig) { RenderTargetIdentifier colorRT = BuiltinRenderTextureType.CameraTarget; RenderTargetIdentifier depthRT = BuiltinRenderTextureType.None; if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.Stereo)) context.StartMultiEye(m_CurrCamera); CommandBuffer cmd = CommandBufferPool.Get("SetCameraRenderTarget"); bool intermeaditeTexture = LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.IntermediateTexture); if (intermeaditeTexture) { if (!m_IsOffscreenCamera) colorRT = m_CurrCameraColorRT; if (m_RequireDepthTexture) depthRT = m_DepthRT; } if (ForceClear()) { SetRenderTarget(cmd, colorRT, depthRT, ClearFlag.All); } else { ClearFlag clearFlag = ClearFlag.None; CameraClearFlags cameraClearFlags = m_CurrCamera.clearFlags; if (cameraClearFlags != CameraClearFlags.Nothing) { clearFlag |= ClearFlag.Depth; if (cameraClearFlags == CameraClearFlags.Color || cameraClearFlags == CameraClearFlags.Skybox) clearFlag |= ClearFlag.Color; } SetRenderTarget(cmd, colorRT, depthRT, clearFlag); } // If rendering to an intermediate RT we resolve viewport on blit due to offset not being supported // while rendering to a RT. if (!intermeaditeTexture && !LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.DefaultViewport)) cmd.SetViewport(m_CurrCamera.pixelRect); context.ExecuteCommandBuffer(cmd); CommandBufferPool.Release(cmd); } private void EndForwardRendering(ref ScriptableRenderContext context, FrameRenderingConfiguration renderingConfig) { // No additional rendering needs to be done if this is an off screen rendering camera if (m_IsOffscreenCamera) return; var cmd = CommandBufferPool.Get("Blit"); if (m_IntermediateTextureArray) { cmd.Blit(m_CurrCameraColorRT, BuiltinRenderTextureType.CameraTarget); } else if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.IntermediateTexture)) { Material blitMaterial = m_BlitMaterial; if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.Stereo)) blitMaterial = null; // If PostProcessing is enabled, it is already blit to CameraTarget. if (!LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.PostProcess)) Blit(cmd, renderingConfig, m_CurrCameraColorRT, BuiltinRenderTextureType.CameraTarget, blitMaterial); } SetRenderTarget(cmd, BuiltinRenderTextureType.CameraTarget); context.ExecuteCommandBuffer(cmd); CommandBufferPool.Release(cmd); if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.Stereo)) { context.StopMultiEye(m_CurrCamera); context.StereoEndRender(m_CurrCamera); } } RendererConfiguration GetRendererSettings(ref LightData lightData) { RendererConfiguration settings = RendererConfiguration.PerObjectReflectionProbes | RendererConfiguration.PerObjectLightmaps | RendererConfiguration.PerObjectLightProbe; if (lightData.totalAdditionalLightsCount > 0) settings |= RendererConfiguration.PerObjectLightIndices8; return settings; } private void SetRenderTarget(CommandBuffer cmd, RenderTargetIdentifier colorRT, ClearFlag clearFlag = ClearFlag.None) { int depthSlice = (m_IntermediateTextureArray) ? -1 : 0; CoreUtils.SetRenderTarget(cmd, colorRT, clearFlag, CoreUtils.ConvertSRGBToActiveColorSpace(m_CurrCamera.backgroundColor), 0, CubemapFace.Unknown, depthSlice); } private void SetRenderTarget(CommandBuffer cmd, RenderTargetIdentifier colorRT, RenderTargetIdentifier depthRT, ClearFlag clearFlag = ClearFlag.None) { if (depthRT == BuiltinRenderTextureType.None || !m_DepthRenderBuffer) { SetRenderTarget(cmd, colorRT, clearFlag); return; } 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 int GetLightUnsortedIndex(int index) { return (index < m_SortedLightIndexMap.Count) ? m_SortedLightIndexMap[index] : index; } private bool ForceClear() { // Clear RenderTarget to avoid tile initialization on mobile GPUs // https://community.arm.com/graphics/b/blog/posts/mali-performance-2-how-to-correctly-handle-framebuffers return (Application.platform == RuntimePlatform.Android || Application.platform == RuntimePlatform.IPhonePlayer); } private void Blit(CommandBuffer cmd, FrameRenderingConfiguration renderingConfig, RenderTargetIdentifier sourceRT, RenderTargetIdentifier destRT, Material material = null) { cmd.SetGlobalTexture(m_BlitTexID, sourceRT); if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.DefaultViewport)) { cmd.Blit(sourceRT, destRT, material); } else { if (m_BlitQuad == null) m_BlitQuad = LightweightUtils.CreateQuadMesh(false); SetRenderTarget(cmd, destRT); cmd.SetViewProjectionMatrices(Matrix4x4.identity, Matrix4x4.identity); cmd.SetViewport(m_CurrCamera.pixelRect); cmd.DrawMesh(m_BlitQuad, Matrix4x4.identity, material); } } private void CopyTexture(CommandBuffer cmd, RenderTargetIdentifier sourceRT, RenderTargetIdentifier destRT, Material copyMaterial) { if (m_CopyTextureSupport != CopyTextureSupport.None) cmd.CopyTexture(sourceRT, destRT); else cmd.Blit(sourceRT, destRT, copyMaterial); } } }