using UnityEngine; using UnityEngine.Rendering; using UnityEngine.Rendering.Universal; class MyBlitRenderPass : ScriptableRenderPass { // used to label this pass in Unity's Frame Debug utility string profilerTag; Material materialToBlit; RenderTargetIdentifier cameraColorTargetIdent; RenderTargetHandle tempTexture; public MyBlitRenderPass(string profilerTag, RenderPassEvent renderPassEvent, Material materialToBlit) { this.profilerTag = profilerTag; this.renderPassEvent = renderPassEvent; this.materialToBlit = materialToBlit; } // This isn't part of the ScriptableRenderPass class and is our own addition. // For this custom pass we need the camera's color target, so that gets passed in. public void Setup(RenderTargetIdentifier cameraColorTargetIdent) { this.cameraColorTargetIdent = cameraColorTargetIdent; } // called each frame before Execute, use it to set up things the pass will need public override void Configure(CommandBuffer cmd, RenderTextureDescriptor cameraTextureDescriptor) { // create a temporary render texture that matches the camera cmd.GetTemporaryRT(tempTexture.id, cameraTextureDescriptor); } // Execute is called for every eligible camera every frame. It's not called at the moment that // rendering is actually taking place, so don't directly execute rendering commands here. // Instead use the methods on ScriptableRenderContext to set up instructions. // RenderingData provides a bunch of (not very well documented) information about the scene // and what's being rendered. public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData) { // fetch a command buffer to use CommandBuffer cmd = CommandBufferPool.Get(profilerTag); cmd.Clear(); // the actual content of our custom render pass! // we apply our material while blitting to a temporary texture cmd.Blit(cameraColorTargetIdent, tempTexture.Identifier(), materialToBlit, 0); // ...then blit it back again cmd.Blit(tempTexture.Identifier(), cameraColorTargetIdent); // don't forget to tell ScriptableRenderContext to actually execute the commands context.ExecuteCommandBuffer(cmd); // tidy up after ourselves cmd.Clear(); CommandBufferPool.Release(cmd); } // called after Execute, use it to clean up anything allocated in Configure public override void FrameCleanup(CommandBuffer cmd) { cmd.ReleaseTemporaryRT(tempTexture.id); } }