Merge pull request #1084 from Unity-Technologies/LW-DistortionPass

Add Opaque Copy Texture functionality

ScriptableRenderPipeline/LightweightPipeline/LWRP/Data/LightweightPipelineAsset.cs

         _8x = 8
     }
 
+    public enum Downsampling
+    {
+        None = 0,
+        _2xBilinear,
+        _4xBox,
+        _4xBilinear
+    }
+
     public enum DefaultMaterialType
     {
         Standard = 0,
         [SerializeField] private bool m_SupportsVertexLight = false;
         [SerializeField] private bool m_RequireDepthTexture = false;
         [SerializeField] private bool m_RequireSoftParticles = false;
+        [SerializeField] private bool m_RequireOpaqueTexture = false;
+        [SerializeField] private Downsampling m_OpaqueDownsampling = Downsampling._2xBilinear;
         [SerializeField] private bool m_SupportsHDR = false;
         [SerializeField] private MSAAQuality m_MSAA = MSAAQuality._4x;
         [SerializeField] private float m_RenderScale = 1.0f;
         public bool RequireDepthTexture
         {
             get { return m_RequireDepthTexture; }
+            set { m_RequireDepthTexture = value; }
         }
 
         public bool RequireSoftParticles
 
+        public bool RequireOpaqueTexture
+        {
+            get { return m_RequireOpaqueTexture; }
+            set { m_RequireOpaqueTexture = value; }
+        }
+
+        public Downsampling OpaqueDownsampling
+        {
+            get { return m_OpaqueDownsampling; }
+            set { m_OpaqueDownsampling = value; }
+        }
+
         public bool SupportsHDR
         {
             get { return m_SupportsHDR; }
         public Shader ScreenSpaceShadowShader
         {
             get { return resources != null ? resources.ScreenSpaceShadowShader : null; }
+        }
+
+        public Shader SamplingShader
+        {
+            get { return resources != null ? resources.SamplingShader : null; }
         }
     }
 }

ScriptableRenderPipeline/LightweightPipeline/LWRP/Data/LightweightPipelineResources.asset

   CopyDepthShader: {fileID: 4800000, guid: d6dae50ee9e1bfa4db75f19f99355220, type: 3}
   ScreenSpaceShadowShader: {fileID: 4800000, guid: 0f854b35a0cf61a429bd5dcfea30eddd,
     type: 3}
+  SamplingShader: {fileID: 4800000, guid: 04c410c9937594faa893a11dceb85f7e, type: 3}

ScriptableRenderPipeline/LightweightPipeline/LWRP/Data/LightweightPipelineResources.cs

     public Shader BlitShader;
     public Shader CopyDepthShader;
     public Shader ScreenSpaceShadowShader;
+    public Shader SamplingShader;
 }

ScriptableRenderPipeline/LightweightPipeline/LWRP/Editor/LightweightAssetEditor.cs

 
             public static GUIContent requireSoftParticles = new GUIContent("Soft Particles", "If enabled the pipeline will enable SOFT_PARTICLES keyword.");
 
+            public static GUIContent requireOpaqueTexture = new GUIContent("Opaque Texture", "If enabled the pipeline will copy the screen to texture after opaque objects are drawn. For transparent objects this can be bound in shaders as _CameraOpaqueTexture.");
+
+            public static GUIContent opaqueDownsampling = new GUIContent("Opaque Downsampling", "The downsampling method that is used for the opaque texture");
+
             public static GUIContent shadowType = new GUIContent("Type",
                     "Global shadow settings. Options are NO_SHADOW, HARD_SHADOWS and SOFT_SHADOWS.");
 
 
             public static string[] shadowTypeOptions = {"No Shadows", "Hard Shadows", "Hard and Soft Shadows"};
             public static string[] shadowCascadeOptions = {"No Cascades", "Two Cascades", "Four Cascades"};
+            public static string[] opaqueDownsamplingOptions = {"None", "2x (Bilinear)", "4x (Box)", "4x (Bilinear)"};
+        AnimBool m_ShowOpaqueTextureScale = new AnimBool();
+
 
         private int kMaxSupportedPixelLights = 8;
         private float kMinRenderScale = 0.1f;
         private SerializedProperty m_SupportsVertexLightProp;
         private SerializedProperty m_RequireDepthTextureProp;
         private SerializedProperty m_RequireSoftParticlesProp;
+        private SerializedProperty m_RequireOpaqueTextureProp;
+        private SerializedProperty m_OpaqueDownsamplingProp;
         private SerializedProperty m_ShadowTypeProp;
         private SerializedProperty m_ShadowDistanceProp;
         private SerializedProperty m_ShadowAtlasResolutionProp;
             m_SupportsVertexLightProp = serializedObject.FindProperty("m_SupportsVertexLight");
             m_RequireDepthTextureProp = serializedObject.FindProperty("m_RequireDepthTexture");
             m_RequireSoftParticlesProp = serializedObject.FindProperty("m_RequireSoftParticles");
+            m_RequireOpaqueTextureProp = serializedObject.FindProperty("m_RequireOpaqueTexture");
+            m_OpaqueDownsamplingProp = serializedObject.FindProperty("m_OpaqueDownsampling");
             m_ShadowTypeProp = serializedObject.FindProperty("m_ShadowType");
             m_ShadowDistanceProp = serializedObject.FindProperty("m_ShadowDistance");
             m_ShadowAtlasResolutionProp = serializedObject.FindProperty("m_ShadowAtlasResolution");
 
             m_ShowSoftParticles.valueChanged.AddListener(Repaint);
             m_ShowSoftParticles.value = m_RequireSoftParticlesProp.boolValue;
+            m_ShowOpaqueTextureScale.valueChanged.AddListener(Repaint);
+            m_ShowOpaqueTextureScale.value = m_RequireOpaqueTextureProp.boolValue;
+            m_ShowOpaqueTextureScale.valueChanged.RemoveListener(Repaint);
+            m_ShowOpaqueTextureScale.target = m_RequireOpaqueTextureProp.boolValue;
         }
 
         void DrawAnimatedProperty(SerializedProperty prop, GUIContent content, AnimBool animation)
                     EditorGUILayout.PropertyField(prop, content);
         }
 
+        void DrawAnimatedPopup(SerializedProperty prop, GUIContent content, string[] options, AnimBool animation)
+        {
+            using (var group = new EditorGUILayout.FadeGroupScope(animation.faded))
+                if (group.visible)
+                    CoreEditorUtils.DrawPopup(content, prop, options);
+        }
+
         public override void OnInspectorGUI()
         {
             serializedObject.Update();
             EditorGUILayout.PropertyField(m_SupportsVertexLightProp, Styles.enableVertexLightLabel);
             EditorGUILayout.PropertyField(m_RequireDepthTextureProp, Styles.requireDepthTexture);
             DrawAnimatedProperty(m_RequireSoftParticlesProp, Styles.requireSoftParticles, m_ShowSoftParticles);
+            EditorGUILayout.PropertyField(m_RequireOpaqueTextureProp, Styles.requireOpaqueTexture);
+            DrawAnimatedPopup(m_OpaqueDownsamplingProp, Styles.opaqueDownsampling, Styles.opaqueDownsamplingOptions, m_ShowOpaqueTextureScale);
             EditorGUILayout.PropertyField(m_HDR, Styles.hdrContent);
             EditorGUILayout.PropertyField(m_MSAA, Styles.msaaContent);
 

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs

 
         // If soft particles are enabled and no depth prepass is performed we need to copy depth.
         public static int depthCopy;
+
+        // Camera opaque target. Used for accessing screen contents during transparent pass.
+        public static int opaque;
     }
 
     public class LightweightPipeline : RenderPipeline
         private RenderTargetIdentifier m_DepthRT;
         private RenderTargetIdentifier m_CopyDepth;
         private RenderTargetIdentifier m_Color;
+        private RenderTargetIdentifier m_OpaqueRT;
+        private float[] m_OpaqueScalerValues = {1.0f, 0.5f, 0.25f, 0.25f};
 
         private float m_RenderScale;
 
         private Material m_BlitMaterial;
         private Material m_CopyDepthMaterial;
         private Material m_ErrorMaterial;
+        private Material m_SamplingMaterial;
+        private int m_SampleOffset;
         private int m_BlitTexID = Shader.PropertyToID("_BlitTex");
 
         private CopyTextureSupport m_CopyTextureSupport;
             CameraRenderTargetID.copyColor = Shader.PropertyToID("_CameraCopyColorRT");
             CameraRenderTargetID.depth = Shader.PropertyToID("_CameraDepthTexture");
             CameraRenderTargetID.depthCopy = Shader.PropertyToID("_CameraCopyDepthTexture");
+            CameraRenderTargetID.opaque = Shader.PropertyToID("_CameraOpaqueTexture");
+
+            m_SampleOffset = Shader.PropertyToID("_SampleOffset");
+            m_OpaqueRT = new RenderTargetIdentifier(CameraRenderTargetID.opaque);
             m_PostProcessRenderContext = new PostProcessRenderContext();
 
             m_CopyTextureSupport = SystemInfo.copyTextureSupport;
             m_BlitQuad = LightweightUtils.CreateQuadMesh(false);
             m_BlitMaterial = CoreUtils.CreateEngineMaterial(m_Asset.BlitShader);
             m_CopyDepthMaterial = CoreUtils.CreateEngineMaterial(m_Asset.CopyDepthShader);
+            m_SamplingMaterial = CoreUtils.CreateEngineMaterial(m_Asset.SamplingShader);
             m_ErrorMaterial = CoreUtils.CreateEngineMaterial("Hidden/InternalErrorShader");
         }
 
             CoreUtils.Destroy(m_ErrorMaterial);
             CoreUtils.Destroy(m_CopyDepthMaterial);
             CoreUtils.Destroy(m_BlitMaterial);
+            CoreUtils.Destroy(m_SamplingMaterial);
 
 #if UNITY_EDITOR
             SceneViewDrawMode.ResetDrawMode();
                 cmd.ReleaseTemporaryRT(CameraRenderTargetID.depth);
                 cmd.ReleaseTemporaryRT(CameraRenderTargetID.color);
                 cmd.ReleaseTemporaryRT(CameraRenderTargetID.copyColor);
+                cmd.ReleaseTemporaryRT(CameraRenderTargetID.opaque);
+
                 context.ExecuteCommandBuffer(cmd);
                 CommandBufferPool.Release(cmd);
 
             LightweightUtils.StopStereoRendering(m_CurrCamera, ref context, frameRenderingConfiguration);
         }
 
+        private void OpaqueTexturePass(ref ScriptableRenderContext context, FrameRenderingConfiguration frameRenderingConfiguration)
+        {
+            var opaqueScaler = m_OpaqueScalerValues[(int)m_Asset.OpaqueDownsampling];
+            RenderTextureDescriptor opaqueDesc = CreateRTDesc(frameRenderingConfiguration, opaqueScaler);
+            
+            CommandBuffer cmd = CommandBufferPool.Get("Opaque Copy");
+            cmd.GetTemporaryRT(CameraRenderTargetID.opaque, opaqueDesc, m_Asset.OpaqueDownsampling == Downsampling.None ? FilterMode.Point : FilterMode.Bilinear);
+            switch(m_Asset.OpaqueDownsampling)
+            {
+                case Downsampling.None:
+                    cmd.Blit(m_CurrCameraColorRT, CameraRenderTargetID.opaque);
+                    break;
+                case Downsampling._2xBilinear:
+                    cmd.Blit(m_CurrCameraColorRT, CameraRenderTargetID.opaque);
+                    break;
+                case Downsampling._4xBox:
+                    m_SamplingMaterial.SetFloat(m_SampleOffset, 2);
+                    cmd.Blit(m_CurrCameraColorRT, CameraRenderTargetID.opaque, m_SamplingMaterial, 0);
+                    break;
+                case Downsampling._4xBilinear:
+                    cmd.Blit(m_CurrCameraColorRT, CameraRenderTargetID.opaque);
+                    break;
+            }
+            SetRenderTarget(cmd, m_CurrCameraColorRT, m_DepthRT);
+            context.ExecuteCommandBuffer(cmd);
+            CommandBufferPool.Release(cmd);
+        }
+
         private void ForwardPass(FrameRenderingConfiguration frameRenderingConfiguration, ref LightData lightData, ref ScriptableRenderContext context)
         {
             SetupShaderConstants(ref lightData, ref context);
 
         private void AfterOpaque(ref ScriptableRenderContext context, FrameRenderingConfiguration config)
         {
-            if (!m_RequireDepthTexture)
-                return;
+            if (m_RequireDepthTexture)
+            {
+                CommandBuffer cmd = CommandBufferPool.Get("After Opaque");
+                cmd.SetGlobalTexture(CameraRenderTargetID.depth, m_DepthRT);
-            CommandBuffer cmd = CommandBufferPool.Get("After Opaque");
-            cmd.SetGlobalTexture(CameraRenderTargetID.depth, m_DepthRT);
+                bool setRenderTarget = false;
+                RenderTargetIdentifier depthRT = 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);
-            // 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)
+                    setRenderTarget = true;
+                    SetRenderTarget(cmd, m_CurrCameraColorRT, m_DepthRT);
+                }
+
+                if (LightweightUtils.HasFlag(config, FrameRenderingConfiguration.DepthCopy))
-                    RenderPostProcess(cmd, m_CurrCameraColorRT, m_CopyColorRT, true);
-                    cmd.Blit(m_CopyColorRT, m_CurrCameraColorRT);
+                    CopyTexture(cmd, m_DepthRT, m_CopyDepth, m_CopyDepthMaterial);
+                    depthRT = m_CopyDepth;
+                    setRenderTarget = true;
-                else
-                    RenderPostProcess(cmd, m_CurrCameraColorRT, m_CurrCameraColorRT, true);
-                setRenderTarget = true;
-                SetRenderTarget(cmd, m_CurrCameraColorRT, m_DepthRT);
+                if (setRenderTarget)
+                    SetRenderTarget(cmd, m_CurrCameraColorRT, depthRT);
+                context.ExecuteCommandBuffer(cmd);
+                CommandBufferPool.Release(cmd);
-
-            if (LightweightUtils.HasFlag(config, FrameRenderingConfiguration.DepthCopy))
+            
+            if(m_Asset.RequireOpaqueTexture)
-                CopyTexture(cmd, m_DepthRT, m_CopyDepth, m_CopyDepthMaterial);
-                depthRT = m_CopyDepth;
-                setRenderTarget = true;
+                OpaqueTexturePass(ref context, config);
-
-            if (setRenderTarget)
-                SetRenderTarget(cmd, m_CurrCameraColorRT, depthRT);
-            context.ExecuteCommandBuffer(cmd);
-            CommandBufferPool.Release(cmd);
         }
 
         private void RenderTransparents(ref ScriptableRenderContext context, RendererConfiguration config)
                 configuration |= FrameRenderingConfiguration.IntermediateTexture;
         }
 
+        private RenderTextureDescriptor CreateRTDesc(FrameRenderingConfiguration renderingConfig, float scaler = 1.0f)
+        {
+            RenderTextureDescriptor desc;
+            if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.Stereo))
+                desc = XRSettings.eyeTextureDesc;
+            else
+                desc = new RenderTextureDescriptor(m_CurrCamera.pixelWidth, m_CurrCamera.pixelHeight);
+
+            float renderScale = GetRenderScale();
+            desc.width = (int)((float)desc.width * renderScale * scaler);
+            desc.height = (int)((float)desc.height * renderScale * scaler);
+            return desc;
+        }
+
         private void SetupIntermediateResources(FrameRenderingConfiguration renderingConfig, bool shadows, ref ScriptableRenderContext context)
         {
             CommandBuffer cmd = CommandBufferPool.Get("Setup Intermediate Resources");
 
         private void SetupIntermediateRenderTextures(CommandBuffer cmd, FrameRenderingConfiguration renderingConfig, bool shadows, int msaaSamples)
         {
-            RenderTextureDescriptor baseDesc;
-            if (LightweightUtils.HasFlag(renderingConfig, FrameRenderingConfiguration.Stereo))
-                baseDesc = XRSettings.eyeTextureDesc;
-            else
-                baseDesc = new RenderTextureDescriptor(m_CurrCamera.pixelWidth, m_CurrCamera.pixelHeight);
-
-            float renderScale = GetRenderScale();
-            baseDesc.width = (int)((float)baseDesc.width * renderScale);
-            baseDesc.height = (int)((float)baseDesc.height * renderScale);
+            RenderTextureDescriptor baseDesc = CreateRTDesc(renderingConfig);
 
             if (m_RequireDepthTexture)
             {

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ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightSampling.shader

+Shader "Hidden/LightweightPipeline/Sampling"
+{
+    Properties
+    {
+        _MainTex("Albedo", 2D) = "white" {}
+    }
+
+    HLSLINCLUDE
+    #include "LWRP/ShaderLibrary/Core.hlsl"
+
+    struct VertexInput
+    {
+        float4 vertex   : POSITION;
+        float2 texcoord : TEXCOORD0;
+    };
+
+    struct Interpolators
+    {
+        float4  pos      : SV_POSITION;
+        float2  texcoord : TEXCOORD0;
+    };
+
+    Interpolators Vertex(VertexInput i)
+    {
+        Interpolators o;
+        UNITY_SETUP_INSTANCE_ID(i);
+        UNITY_TRANSFER_INSTANCE_ID(i, o);
+
+        o.pos = TransformObjectToHClip(i.vertex.xyz);
+        o.texcoord.xy = i.texcoord;
+        return o;
+    }
+
+    half4 DownsampleBox4Tap(Texture2D tex, SamplerState samplerTex, float2 uv, float2 texelSize, float amount)
+    {
+        float4 d = texelSize.xyxy * float4(-amount, -amount, amount, amount);
+
+        half4 s;
+        s =  (SAMPLE_TEXTURE2D(tex, samplerTex, uv + d.xy));
+        s += (SAMPLE_TEXTURE2D(tex, samplerTex, uv + d.zy));
+        s += (SAMPLE_TEXTURE2D(tex, samplerTex, uv + d.xw));
+        s += (SAMPLE_TEXTURE2D(tex, samplerTex, uv + d.zw));
+
+        return s * 0.25h;
+    }
+
+    ENDHLSL
+
+    SubShader
+    {
+        Tags { "RenderType" = "Opaque" "RenderPipeline" = "LightweightPipeline"}
+        LOD 100
+
+        // 0 - Downsample - Box filtering
+        Pass
+        {
+            Tags { "LightMode" = "LightweightForward"}
+
+            ZTest Always
+            ZWrite Off
+
+            HLSLPROGRAM
+            // Required to compile gles 2.0 with standard srp library
+            #pragma prefer_hlslcc gles
+            #pragma vertex Vertex
+            #pragma fragment FragBoxDownsample
+
+            TEXTURE2D(_MainTex);
+            SAMPLER(sampler_MainTex);
+            float4 _MainTex_TexelSize;
+
+            float _SampleOffset;
+
+            half4 FragBoxDownsample(Interpolators i) : SV_Target
+            {
+                half4 col = DownsampleBox4Tap(TEXTURE2D_PARAM(_MainTex, sampler_MainTex), i.texcoord, _MainTex_TexelSize.xy, _SampleOffset);
+                return half4(col.rgb, 1);
+            }
+            ENDHLSL
+        }
+    }
+}

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