using UnityEngine.Rendering.Universal;
using UnityEngine.Rendering;
using UnityEngine;

public class RenderToTextureFeature : ScriptableRendererFeature
{
    class RenderToTexturePass : ScriptableRenderPass
    {
        public RenderTexture renderTexture;
        private Material blitMaterial;

        public RenderToTexturePass(RenderTexture renderTexture)
        {
            this.renderTexture = renderTexture;
            blitMaterial = new Material(Shader.Find("Hidden/BlitCopy"));
        }

        public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
        {
            CommandBuffer cmd = CommandBufferPool.Get("RenderToTexture");

            // 获取当前渲染目标
            RenderTargetIdentifier currentTarget = renderingData.cameraData.renderer.cameraColorTarget;

            // 设置渲染目标为 RenderTexture
            cmd.SetRenderTarget(renderTexture);
            cmd.ClearRenderTarget(true, true, Color.clear);

            // 执行渲染操作（例如渲染相机的内容到目标纹理）
            cmd.Blit(currentTarget, renderTexture, blitMaterial);

            context.ExecuteCommandBuffer(cmd);
            CommandBufferPool.Release(cmd);
        }
    }

    private RenderToTexturePass renderPass;

    public RenderToTextureFeature(RenderTexture renderTexture)
    {
        renderPass = new RenderToTexturePass(renderTexture);
    }

    public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
    {
        renderer.EnqueuePass(renderPass);
    }

    public override void Create()
    {
        throw new System.NotImplementedException();
    }
}