Custom Renderer Features

Custom Renderer Features

在URP里，可以通过扩展RendererFeatures来实现自定义的Pass。

编写自定义RendererFeatures

• 新建PostProcessingPass，继承ScriptableRenderPass

      public class PostProcessingPass : ScriptableRenderPass{
          private const string CommandBufferTag = "CustomPostProcessing";
  
          public PostProcessingPass(){
              //通过设置renderPassEvent,来控制该pass在何时被渲染。
              this.renderPassEvent = RenderPassEvent.AfterRenderingTransparents;
          }
          
          ///在Execute里可以构造Pass渲染指令
          public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
          {
              var cmd = CommandBufferPool.Get(CommandBufferTag);
              try{
                  // 调用渲染函数
                  Render(cmd, ref renderingData,context);
                  // 执行命令缓冲区
                  context.ExecuteCommandBuffer(cmd);
              }finally{
                  // 释放命令缓存
                  CommandBufferPool.Release(cmd);
              }
          }
      }

• 新建PostProcessingFeature,继承自ScriptableRendererFeature

  public class PostProcessingFeature : ScriptableRendererFeature
  {
      private PostProcessingPass _pass;
      //在此处初始化
      public override void Create(){
          _pass = new PostProcessingPass();
      }
  
      //在此处将自定义的Pass加入到渲染管线中
      public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData){
          //设置渲染对象
          _pass.ConfigureTarget(renderer.cameraColorTarget);
          //将Pass加入到渲染管线
          renderer.EnqueuePass(_pass);
      }
  
  
  }

  继承自ScriptableRendererFeature后需要实现两个函数，其中

  • OnCreate 用于初始化
  • AddRenderPasses 则用于将自定义的Pass加入到渲染管线中。

• 将PostProcessingFeature加入到渲染管线中

  • 选中Settings/ForwardRenderer
  • 在右侧面板点击Add Renderer Features即可添加