using System;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;
using X.Rendering.Assets;

namespace X.Rendering.Scene
{
    internal class ShadowEdgeRemapSetupPass : ScriptableRenderPass, IDisposable
    {
        [Serializable]
        public class ShadowEdgeRemapSettings
        {
            public bool Enable = true;
            public GradientTexture ShadowRemapTex;
            public RenderPassEvent InjectionPoint = RenderPassEvent.BeforeRendering;
        }

        const string ShadowRemap = "_ShadowRemapON";
        private ShadowEdgeRemapSettings settings;
        private CommandBuffer commandBuffer;

        public ShadowEdgeRemapSetupPass(ShadowEdgeRemapSettings settings, SceneEffect sceneEffect)
        {
            this.settings = settings;
            renderPassEvent = settings.InjectionPoint;
            commandBuffer = CommandBufferPool.Get(nameof(ShadowEdgeRemapSetupPass) + sceneEffect.name);
        }

        public override void FrameCleanup(CommandBuffer cmd)
        {
            cmd.DisableShaderKeyword(ShadowRemap);
        }

        public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
        {
            var cmd = commandBuffer;
            cmd.EnableShaderKeyword(ShadowRemap);
            cmd.SetGlobalTexture("_ShadowRemap", settings.ShadowRemapTex.GetTexture());
            context.ExecuteCommandBuffer(cmd);
            cmd.Clear();
        }

        public void Dispose()
        {
            commandBuffer.Dispose();
        }
    }
}