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

public class SKYPRO_Renderer : ScriptableRendererFeature
{
    class CustomRenderPass : ScriptableRenderPass
    {
        public RenderTargetIdentifier source;

        private Material _material;

        private RenderTargetHandle tempRenderTarget;

        public CustomRenderPass(Material mat)
        {
            _material = mat;

            tempRenderTarget.Init("_TemporaryColourTexture");
        }

        // This method is called before executing the render pass.
        // It can be used to configure render targets and their clear state. Also to create temporary render target textures.
        // When empty this render pass will render to the active camera render target.
        // You should never call CommandBuffer.SetRenderTarget. Instead call <c>ConfigureTarget</c> and <c>ConfigureClear</c>.
        // The render pipeline will ensure target setup and clearing happens in an performance manner.
        public override void Configure(CommandBuffer cmd, RenderTextureDescriptor cameraTextureDescriptor)
        {

        }

        // Here you can implement the rendering logic.
        // Use <c>ScriptableRenderContext</c> to issue drawing commands or execute command buffers
        // https://docs.unity3d.com/ScriptReference/Rendering.ScriptableRenderContext.html
        // You don't have to call ScriptableRenderContext.submit, the render pipeline will call it at specific points in the pipeline.
        public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
        {
            CommandBuffer commandBuffer = CommandBufferPool.Get();

            commandBuffer.GetTemporaryRT(tempRenderTarget.id, renderingData.cameraData.cameraTargetDescriptor);
            Blit(commandBuffer, source, tempRenderTarget.Identifier(), _material);
            Blit(commandBuffer, tempRenderTarget.Identifier(), source);
            
            context.ExecuteCommandBuffer(commandBuffer);
            CommandBufferPool.Release(commandBuffer);
        }

        /// Cleanup any allocated resources that were created during the execution of this render pass.
        public override void FrameCleanup(CommandBuffer cmd)
        {
        }
    }

    [System.Serializable]
    public class _Settings
    {
        public Material material = null;
    }

    public _Settings settings = new _Settings();

    CustomRenderPass m_ScriptablePass;

    public override void Create()
    {
        m_ScriptablePass = new CustomRenderPass(settings.material);

        // Configures where the render pass should be injected.
        //m_ScriptablePass.renderPassEvent = RenderPassEvent.BeforeRenderingOpaques;
        //m_ScriptablePass.renderPassEvent = RenderPassEvent.AfterRenderingOpaques;
        //m_ScriptablePass.renderPassEvent = RenderPassEvent.BeforeRenderingSkybox;
        //m_ScriptablePass.renderPassEvent = RenderPassEvent.AfterRenderingSkybox;
        //m_ScriptablePass.renderPassEvent = RenderPassEvent.BeforeRenderingTransparents;
        m_ScriptablePass.renderPassEvent = RenderPassEvent.AfterRenderingTransparents;
        //m_ScriptablePass.renderPassEvent = RenderPassEvent.BeforeRenderingPostProcessing;
        //m_ScriptablePass.renderPassEvent = RenderPassEvent.AfterRenderingPostProcessing;
    }

    // Here you can inject one or multiple render passes in the renderer.
    // This method is called when setting up the renderer once per-camera.
    public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
    {
        m_ScriptablePass.source = renderer.cameraColorTarget;
        renderer.EnqueuePass(m_ScriptablePass);
    }
}