ImGuiHDRPRenderPass.cs

using InitialPrefabs.NimGui.Loop;
using UnityEngine;
using UnityEngine.Rendering.HighDefinition;
using UnityEngine.Rendering;

namespace InitialPrefabs.NimGui.Render {

    public class ImGuiHDRPRenderPass : CustomPass {

        /// <summary>
        /// In HDRP this is aliased to an automatically initialized CommandBuffer in <see cref="CommandBuffer"/>
        /// and <see cref="DefaultImGuiInitializationProxy.OnEnable"/>
        /// </summary>
        public CommandBuffer DrawCommand { get; private set; }

        /// <summary>
        /// In HDRP this is aliased to an automatically initialized ProperyBlock in <see cref="ImGuiRunner.CommandBuffer"/>
        /// and <see cref="DefaultImGuiInitializationProxy.OnEnable"/>
        /// </summary>
        public MaterialPropertyBlock PropertyBlock { get; private set; }

        protected override void Setup(ScriptableRenderContext renderContext, CommandBuffer cmd) {
            // Setup code here
            DrawCommand = ImGuiRunner.CommandBuffer;
            PropertyBlock = ImGuiRunner.PropertyBlock;
        }

        protected override void Execute(CustomPassContext ctx) {
#if UNITY_EDITOR
            // TODO: Figure out how to grab whether the camera is a scene camera or preview camera.
#endif
            var renderContext = ctx.renderContext;
            renderContext.ExecuteCommandBuffer(DrawCommand);
        }

        protected override void Cleanup() {
            // Cleanup code
        }
    }
}