290 lines
14 KiB
C#
290 lines
14 KiB
C#
using System;
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using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.Rendering.RenderGraphModule;
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using UnityEngine.Rendering;
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using UnityEngine.Rendering.Universal;
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// Example of how Blit operatrions can be handled using frameData using multiple ScriptaleRenderPasses.
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public class BlitRendererFeature : ScriptableRendererFeature
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{
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// The class living in frameData. It will take care of managing the texture resources.
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public class BlitData : ContextItem, IDisposable
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{
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// Textures used for the blit operations.
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RTHandle m_TextureFront;
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RTHandle m_TextureBack;
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// Render graph texture handles.
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TextureHandle m_TextureHandleFront;
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TextureHandle m_TextureHandleBack;
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// Scale bias is used to control how the blit operation is done. The x and y parameter controls the scale
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// and z and w controls the offset.
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static Vector4 scaleBias = new Vector4(1f, 1f, 0f, 0f);
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// Bool to manage which texture is the most resent.
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bool m_IsFront = true;
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// The texture which contains the color buffer from the most resent blit operation.
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public TextureHandle texture;
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// Function used to initialize BlitDatat. Should be called before starting to use the class for each frame.
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public void Init(RenderGraph renderGraph, RenderTextureDescriptor targetDescriptor, string textureName = null)
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{
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// Checks if the texture name is valid and puts in default value if not.
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var texName = String.IsNullOrEmpty(textureName) ? "_BlitTextureData" : textureName;
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// Reallocate if the RTHandles are being initialized for the first time or if the targetDescriptor has changed since last frame.
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RenderingUtils.ReAllocateHandleIfNeeded(ref m_TextureFront, targetDescriptor, FilterMode.Bilinear, TextureWrapMode.Clamp, name: texName + "Front");
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RenderingUtils.ReAllocateHandleIfNeeded(ref m_TextureBack, targetDescriptor, FilterMode.Bilinear, TextureWrapMode.Clamp, name: texName + "Back");
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// Create the texture handles inside render graph by importing the RTHandles in render graph.
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m_TextureHandleFront = renderGraph.ImportTexture(m_TextureFront);
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m_TextureHandleBack = renderGraph.ImportTexture(m_TextureBack);
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// Sets the active texture to the front buffer
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texture = m_TextureHandleFront;
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}
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// We will need to reset the texture handle after each frame to avoid leaking invalid texture handles
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// since the texture handles only lives for one frame.
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public override void Reset()
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{
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// Resets the color buffers to avoid carrying invalid references to the next frame.
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// This could be BlitData texture handles from last frame which will now be invalid.
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m_TextureHandleFront = TextureHandle.nullHandle;
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m_TextureHandleBack = TextureHandle.nullHandle;
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texture = TextureHandle.nullHandle;
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// Reset the acrive texture to be the front buffer.
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m_IsFront = true;
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}
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// The data we use to transfer data to the render function.
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class PassData
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{
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// When makeing a blit operation we will need a source, a destination and a material.
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// The source and destination is used to know where to copy from and to.
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public TextureHandle source;
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public TextureHandle destination;
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// The material is used to transform the color buffer while copying.
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public Material material;
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}
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// For this function we don't take a material as argument to show that we should remember to reset values
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// we don't use to avoid leaking values from last frame.
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public void RecordBlitColor(RenderGraph renderGraph, ContextContainer frameData)
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{
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// Check if BlitData's texture is valid if it isn't initialize BlitData.
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if (!texture.IsValid())
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{
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// Setup the descriptor we use for BlitData. We should use the camera target's descriptor as a start.
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var cameraData = frameData.Get<UniversalCameraData>();
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var descriptor = cameraData.cameraTargetDescriptor;
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// We disable MSAA for the blit operations.
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descriptor.msaaSamples = 1;
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// We disable the depth buffer, since we are only makeing transformations to the color buffer.
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descriptor.depthStencilFormat = UnityEngine.Experimental.Rendering.GraphicsFormat.None;
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Init(renderGraph, descriptor);
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}
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// Starts the recording of the render graph pass given the name of the pass
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// and outputting the data used to pass data to the execution of the render function.
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using (var builder = renderGraph.AddRasterRenderPass<PassData>("BlitColorPass", out var passData))
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{
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// Fetch UniversalResourceData from frameData to retrive the camera's active color attachment.
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var resourceData = frameData.Get<UniversalResourceData>();
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// Remember to reset material since it contains the value from last frame.
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// If we don't do this we would get the material last commited to the BlitPassData using RenderGraph
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// since we reuse the object allocation.
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passData.material = null;
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passData.source = resourceData.activeColorTexture;
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passData.destination = texture;
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// Sets input attachment to the cameras color buffer.
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builder.UseTexture(passData.source);
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// Sets output attachment 0 to BlitData's active texture.
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builder.SetRenderAttachment(passData.destination, 0);
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// Sets the render function.
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builder.SetRenderFunc((PassData passData, RasterGraphContext rgContext) => ExecutePass(passData, rgContext));
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}
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}
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// Records a render graph render pass which blits the BlitData's active texture back to the camera's color attachment.
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public void RecordBlitBackToColor(RenderGraph renderGraph, ContextContainer frameData)
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{
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// Check if BlitData's texture is valid if it isn't it hasn't been initialized or an error has occured.
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if (!texture.IsValid()) return;
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// Starts the recording of the render graph pass given the name of the pass
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// and outputting the data used to pass data to the execution of the render function.
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using (var builder = renderGraph.AddRasterRenderPass<PassData>($"BlitBackToColorPass", out var passData))
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{
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// Fetch UniversalResourceData from frameData to retrive the camera's active color attachment.
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var resourceData = frameData.Get<UniversalResourceData>();
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// Remember to reset material. Otherwise you would use the last material used in RecordFullScreenPass.
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passData.material = null;
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passData.source = texture;
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passData.destination = resourceData.activeColorTexture;
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// Sets input attachment to BitData's active texture.
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builder.UseTexture(passData.source);
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// Sets output attachment 0 to the cameras color buffer.
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builder.SetRenderAttachment(passData.destination, 0);
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// Sets the render function.
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builder.SetRenderFunc((PassData passData, RasterGraphContext rgContext) => ExecutePass(passData, rgContext));
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}
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}
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// This function blits the whole screen for a given material.
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public void RecordFullScreenPass(RenderGraph renderGraph, string passName, Material material)
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{
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// Checks if the data is previously initialized and if the material is valid.
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if (!texture.IsValid() || material == null)
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{
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Debug.LogWarning("Invalid input texture handle, will skip fullscreen pass.");
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return;
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}
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// Starts the recording of the render graph pass given the name of the pass
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// and outputting the data used to pass data to the execution of the render function.
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using (var builder = renderGraph.AddRasterRenderPass<PassData>(passName, out var passData))
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{
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// Switching the active texture handles to avoid blit. If we want the most recent
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// texture we can simply look at the variable texture
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m_IsFront = !m_IsFront;
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// Setting data to be used when executing the render function.
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passData.material = material;
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passData.source = texture;
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// Swap the active texture.
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if (m_IsFront)
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passData.destination = m_TextureHandleFront;
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else
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passData.destination = m_TextureHandleBack;
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// Sets input attachment to BlitData's old active texture.
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builder.UseTexture(passData.source);
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// Sets output attachment 0 to BitData's new active texture.
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builder.SetRenderAttachment(passData.destination, 0);
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// Update the texture after switching.
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texture = passData.destination;
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// Sets the render function.
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builder.SetRenderFunc((PassData passData, RasterGraphContext rgContext) => ExecutePass(passData, rgContext));
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}
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}
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// ExecutePass is the render function for each of the blit render graph recordings.
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// This is good practice to avoid using variables outside of the lambda it is called from.
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// It is static to avoid using member variables which could cause unintended behaviour.
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static void ExecutePass(PassData data, RasterGraphContext rgContext)
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{
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// We can use blit with or without a material both using the static scaleBias to avoid reallocations.
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if (data.material == null)
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Blitter.BlitTexture(rgContext.cmd, data.source, scaleBias, 0, false);
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else
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Blitter.BlitTexture(rgContext.cmd, data.source, scaleBias, data.material, 0);
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}
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// We need to release the textures once the renderer is released which will dispose every item inside
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// frameData (also data types previously created in earlier frames).
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public void Dispose()
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{
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m_TextureFront?.Release();
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m_TextureBack?.Release();
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}
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}
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// Initial render pass for the renderer feature which is run to initialize the data in frameData and copying
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// the camera's color attachment to a texture inside BlitData so we can do transformations using blit.
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class BlitStartRenderPass : ScriptableRenderPass
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{
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public override void RecordRenderGraph(RenderGraph renderGraph, ContextContainer frameData)
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{
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// Creating the data BlitData inside frameData.
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var blitTextureData = frameData.Create<BlitData>();
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// Copies the camera's color attachment to a texture inside BlitData.
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blitTextureData.RecordBlitColor(renderGraph, frameData);
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}
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}
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// Render pass which makes a blit for each material given to the renderer feature.
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class BlitRenderPass : ScriptableRenderPass
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{
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List<Material> m_Materials;
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// Setup function used to retrive the materials from the renderer feature.
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public void Setup(List<Material> materials)
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{
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m_Materials = materials;
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}
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public override void RecordRenderGraph(RenderGraph renderGraph, ContextContainer frameData)
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{
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// Retrives the BlitData from the current frame.
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var blitTextureData = frameData.Get<BlitData>();
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foreach(var material in m_Materials)
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{
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// Skip current cycle if the material is null since there is no need to blit if no
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// transformation happens.
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if (material == null) continue;
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// Records the material blit pass.
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blitTextureData.RecordFullScreenPass(renderGraph, $"Blit {material.name} Pass", material);
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}
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}
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}
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// Final render pass to copying the texture back to the camera's color attachment.
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class BlitEndRenderPass : ScriptableRenderPass
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{
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public override void RecordRenderGraph(RenderGraph renderGraph, ContextContainer frameData)
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{
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// Retrives the BlitData from the current frame and blit it back again to the camera's color attachment.
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var blitTextureData = frameData.Get<BlitData>();
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blitTextureData.RecordBlitBackToColor(renderGraph, frameData);
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}
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}
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[SerializeField]
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[Tooltip("Materials used for blitting. They will be blit in the same order they have in the list starting from index 0. ")]
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List<Material> m_Materials;
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BlitStartRenderPass m_StartPass;
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BlitRenderPass m_BlitPass;
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BlitEndRenderPass m_EndPass;
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// Here you can create passes and do the initialization of them. This is called everytime serialization happens.
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public override void Create()
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{
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m_StartPass = new BlitStartRenderPass();
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m_BlitPass = new BlitRenderPass();
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m_EndPass = new BlitEndRenderPass();
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// Configures where the render pass should be injected.
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m_StartPass.renderPassEvent = RenderPassEvent.AfterRenderingPostProcessing;
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m_BlitPass.renderPassEvent = RenderPassEvent.AfterRenderingPostProcessing;
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m_EndPass.renderPassEvent = RenderPassEvent.AfterRenderingPostProcessing;
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}
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// Here you can inject one or multiple render passes in the renderer.
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// This method is called when setting up the renderer once per-camera.
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public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
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{
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// Early return if there is no texture to blit.
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if (m_Materials == null || m_Materials.Count == 0) return;
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// Pass the material to the blit render pass.
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m_BlitPass.Setup(m_Materials);
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// Since they have the same RenderPassEvent the order matters when enqueueing them.
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renderer.EnqueuePass(m_StartPass);
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renderer.EnqueuePass(m_BlitPass);
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renderer.EnqueuePass(m_EndPass);
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}
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}
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