【URP】Unity 插入自定义RenderPass
自定义渲染通道是一种改变通用渲染管道（URP）如何渲染场景或场景中的对象的方法。自定义呈现通道(RenderPass)包含自己的Render代码，可以在注入点将其添加到RenderPass中。【从UnityURP开始探索游戏渲染】专栏-直达
添加自定义呈现通道(RenderPass)：
[*]使用Scriptable render pass API创建自定义render pass的代码。
[*]将自定的render pass注入到URP管线中的指定注入点中，有两种方式：
[*]用RenderPipelineManager API注入自定义渲染通道
[*]或者通过创建一个可脚本化的RendererFeature添加到URP渲染器中。
使用Scriptable render pass API创建自定义render pass
[*]Example custom render pass
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;
internal class ColorBlitPass : ScriptableRenderPass
{
ProfilingSampler m_ProfilingSampler = new ProfilingSampler("ColorBlit");
Material m_Material;
RTHandle m_CameraColorTarget;
float m_Intensity;
public ColorBlitPass(Material material)
{
m_Material = material;
renderPassEvent = RenderPassEvent.BeforeRenderingPostProcessing;
}
public void SetTarget(RTHandle colorHandle, float intensity)
{
m_CameraColorTarget = colorHandle;
m_Intensity = intensity;
}
public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData)
{
ConfigureTarget(m_CameraColorTarget);
}
public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
{
var cameraData = renderingData.cameraData;
if (cameraData.camera.cameraType != CameraType.Game)
return;
if (m_Material == null)
return;
CommandBuffer cmd = CommandBufferPool.Get();
using (new ProfilingScope(cmd, m_ProfilingSampler))
{
m_Material.SetFloat("_Intensity", m_Intensity);
Blitter.BlitCameraTexture(cmd, m_CameraColorTarget, m_CameraColorTarget, m_Material, 0);
}
context.ExecuteCommandBuffer(cmd);
cmd.Clear();
CommandBufferPool.Release(cmd);
}
}
将自定的render pass注入到URP管线中的指定注入点中
用RenderPipelineManager API注入自定义渲染通道
[*]通过RenderPipelineManager的注入点委托提供执行时机，加上Camera的EnqueuePass方法注入自定义RenderPass。
public class EnqueuePass : MonoBehaviour
{
private BlurSettings settings;
private BlurRenderPass blurRenderPass;
private void OnEnable()
{
...
blurRenderPass = new BlurRenderPass(settings);
// Subscribe the OnBeginCamera method to the beginCameraRendering event.
RenderPipelineManager.beginCameraRendering += OnBeginCamera;
}
private void OnDisable()
{
RenderPipelineManager.beginCameraRendering -= OnBeginCamera;
blurRenderPass.Dispose();
...
}
private void OnBeginCamera(ScriptableRenderContext context, Camera cam)
{
...
// Use the EnqueuePass method to inject a custom render pass
cam.GetUniversalAdditionalCameraData()
.scriptableRenderer.EnqueuePass(blurRenderPass);
}
}
创建一个可脚本化的RendererFeature
此示例执行将屏幕染成绿色的全屏blit。
[*]要创建自定义渲染通道，创建一个名为ColorBlitPass.cs的新c#脚本，然后从示例自定义渲染通道部分粘贴代码。
[*]注意：这个例子使用了Blitter API。不要使用CommandBuffer。URP中的Blit API。更多信息请参考Blit。
[*]使用上面定义好的定制Render Pass
[*]要创建Scriptable RendererFeature，将自定义渲染通道添加到渲染循环中，请创建一个名为ColorBlitRendererFeature.cs的新c#脚本，然后将示例Scriptable RendererFeature部分中的代码粘贴进来。
[*]Example Scriptable Renderer Feature Scriptable Renderer Feature 添加 render pass 到渲染循环.
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;
internal class ColorBlitRendererFeature : ScriptableRendererFeature
{
public Shader m_Shader;
public float m_Intensity;
Material m_Material;
ColorBlitPass m_RenderPass = null;
public override void AddRenderPasses(ScriptableRenderer renderer,
ref RenderingData renderingData)
{
if (renderingData.cameraData.cameraType == CameraType.Game)
renderer.EnqueuePass(m_RenderPass);
}
public override void SetupRenderPasses(ScriptableRenderer renderer,
in RenderingData renderingData)
{
if (renderingData.cameraData.cameraType == CameraType.Game)
{
// Calling ConfigureInput with the ScriptableRenderPassInput.Color argument
// ensures that the opaque texture is available to the Render Pass.
m_RenderPass.ConfigureInput(ScriptableRenderPassInput.Color);
m_RenderPass.SetTarget(renderer.cameraColorTargetHandle, m_Intensity);
}
}
public override void Create()
{
m_Material = CoreUtils.CreateEngineMaterial(m_Shader);
m_RenderPass = new ColorBlitPass(m_Material);
}
protected override void Dispose(bool disposing)
{
CoreUtils.Destroy(m_Material);
}
}
[*]要创建将像素染成绿色的着色器代码，请创建一个着色器文件，然后从示例着色器部分粘贴代码。
[*]Example shader
[*]着色器执行渲染的GPU端。它从相机中采样颜色纹理，然后输出绿色值设置为所选强度的颜色。
注意：与Blitter API一起使用的着色器必须是手工编码的着色器。图形着色器与Blitter API不兼容。
Shader "ColorBlit"
{
SubShader
{
Tags { "RenderType"="Opaque" "RenderPipeline" = "UniversalPipeline"}
LOD 100
ZWrite Off Cull Off
Pass
{
Name "ColorBlitPass"
HLSLPROGRAM
#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
// The Blit.hlsl file provides the vertex shader (Vert),
// the input structure (Attributes) and the output structure (Varyings)
#include "Packages/com.unity.render-pipelines.core/Runtime/Utilities/Blit.hlsl"
#pragma vertex Vert
#pragma fragment frag
// Set the color texture from the camera as the input texture
TEXTURE2D_X(_CameraOpaqueTexture);
SAMPLER(sampler_CameraOpaqueTexture);
// Set up an intensity parameter
float _Intensity;
half4 frag (Varyings input) : SV_Target
{
UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
// Sample the color from the input texture
float4 color = SAMPLE_TEXTURE2D_X(_CameraOpaqueTexture, sampler_CameraOpaqueTexture, input.texcoord);
// Output the color from the texture, with the green value set to the chosen intensity
return color * float4(0, _Intensity, 0, 1);
}
ENDHLSL
}
}
}
[*]将ColorBlitRendererFeature添加到当前URP Renderer资源中。有关更多信息，请参阅向URP渲染器添加渲染器功能。
[*]要更改亮度，请调整Color Blit Renderer Feature组件中的Intensity属性。
注意：如果项目使用XR，为了使示例可视化，在项目中安装MockHMD XR插件包，然后将渲染模式属性设置为单通道实例化。
https://docs.unity3d.com/Packages/com.unity.render-pipelines.universal@14.0/manual/renderer-features/custom-rendering-pass-workflow-in-urp.html
【从UnityURP开始探索游戏渲染】专栏-直达
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