using UnityEngine.Experimental.Rendering;
using UnityEngine.Experimental.Rendering.LightweightPipeline;
using UnityEngine.Experimental.Rendering.LWRP;

namespace UnityEngine.XR.ARFoundation.LWRPSupport
{
	public class LWRPBeforeCameraRender : MonoBehaviour, IBeforeRender
	{
		const string k_ARBlitTag = "ARBackground Blit Pass";

		public Material blitMaterial { get; set; }

		/// <summary>
		/// Create, setup and return a ScriptableRenderPass that will blit the pass-thru video when this GameObject is rendered.
		/// </summary>
		/// <param name="baseDescriptor">RenderTextureDescriptor for this pass. </param>
		/// <param name="colorHandle">RenderTargetHandle for color buffer.</param>
		/// <param name="depthHandle">RenderTargetHandle for depth buffer.</param>
		/// <param name="clearFlag">ClearFlag used for rendering.</param>
		/// <returns></returns>
		public ScriptableRenderPass GetPassToEnqueue(RenderTextureDescriptor baseDescriptor, RenderTargetHandle colorHandle,
			RenderTargetHandle depthHandle, ClearFlag clearFlag)
		{
			LWRPBackgroundRenderPass lwrpBackgroundRenderPass = new LWRPBackgroundRenderPass();
			lwrpBackgroundRenderPass.Setup(blitMaterial, colorHandle.Identifier(), depthHandle.Identifier(),
				baseDescriptor);
			return lwrpBackgroundRenderPass;
		}
	}
}