using System;
using System.Runtime.InteropServices;
using UnityEngine;

namespace FidelityFX.OpticalFlow
{
    public static class OpticalFlow
    {
        public static OpticalFlowContext CreateContext(in ContextDescription contextDescription)
        {
            throw new NotImplementedException();
        }
        
        public struct ContextDescription
        {
            public Vector2Int resolution;
            public OpticalFlowShaders shaders;
        }

        public struct DispatchDescription
        {
            public ResourceView color;
            public ResourceView opticalFlowVector;
            public ResourceView opticalFlowSCD;
            public bool reset;
            public int backbufferTransferFunction;
            public Vector2 minMaxLuminance;
        }
        
        [Serializable, StructLayout(LayoutKind.Sequential)]
        internal struct OpticalFlowConstants
        {
            public Vector2Int inputLumaResolution;
            public uint opticalFlowPyramidLevel;
            public uint opticalFlowPyramidLevelCount;

            public int frameIndex;
            public uint backbufferTransferFunction;
            public Vector2 minMaxLuminance;
        }
        
        [Serializable, StructLayout(LayoutKind.Sequential)]
        internal struct SpdConstants
        {
            public uint mips;
            public uint numWorkGroups;
            public uint workGroupOffsetX;
            public uint workGroupOffsetY;

            public uint numWorkGroupsOpticalFlowInputPyramid;
            public uint pad0_;
            public uint pad1_;
            public uint pad2_;
        }
    }
}