JigglySolverApi.cs

using MelonLoader;
using System;
using System.Runtime.InteropServices;

namespace Turbones
{
    public static class JigglySolverApi
    {
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        internal delegate void SetPointersAndOffsetsDelegate(
            ref ICallOffsets icalls,
            ref ColliderComponentOffsets component_offsets,
            ref BoneComponentOffsets bone_offsets,
            ref ParticleClassOffsets particle_offsets,
            ref ListClassOffsets list_offsets,
            ref ObjectOffsets object_offsets
        );

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        public delegate void VoidDelegate();

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        internal delegate void SetThreadNumberDelegate(int threadNumber);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        internal delegate void ComponentDelegate(IntPtr boneComponent);

        internal static VoidDelegate FlushColliderCache { get; private set; }
        internal static VoidDelegate JoinMultithreadedJobs { get; private set; }
        internal static SetPointersAndOffsetsDelegate SetPointersAndOffsets { get; private set; }
        internal static SetThreadNumberDelegate SetNumThreads { get; private set; }

        internal static ComponentDelegate DynamicBoneOnEnablePatch { get; private set; }
        internal static ComponentDelegate DynamicBoneOnDisablePatch { get; private set; }
        internal static ComponentDelegate DynamicBoneStartPatch { get; private set; }
        internal static ComponentDelegate DynamicBoneOnDestroyPatch { get; private set; }
        internal static ComponentDelegate ResetParticlePositions { get; private set; }

        public delegate void RegisterColliderForCollisionFeedbackDelegate(IntPtr colliderPtr, byte group);

        public delegate void UnregisterColliderForCollisionFeedbackDelegate(IntPtr colliderPtr);

        public delegate ulong GetAndClearCollidingGroupsMaskDelegate();

        public delegate void BoneConsumingDelegate(IntPtr bonePtr);

        /// <summary>
        /// Registers the specified collider for collision feedback with the specified group.
        /// Valid value for group is between 0 and 63.
        /// If the collider is destroyed, you MUST unregister it.
        /// </summary>
        public static RegisterColliderForCollisionFeedbackDelegate RegisterColliderForCollisionFeedback { get; private set; }

        /// <summary>
        /// Removes the specified collider for collision feedback.
        /// </summary>
        public static UnregisterColliderForCollisionFeedbackDelegate UnregisterColliderForCollisionFeedback { get; private set; }

        /// <summary>
        /// Removes all currently registered colliders from collision feedback
        /// </summary>
        public static VoidDelegate ClearCollisionFeedbackColliders { get; private set; }

        /// <summary>
        /// Gets the collision feedback mask for colliders that have collided since the last get.
        /// The mask has bits set corresponding to groups of registered colliders.
        /// For example, if a collider was registered in group 2, and it and only it has collided, the mask will be set to 0100b = 4.
        /// </summary>
        public static GetAndClearCollidingGroupsMaskDelegate GetAndClearCollidingGroupsMask { get; private set; }

        /// <summary>
        /// Notifies the native solver that the given DynamicBone component is currently being simulated (used in collision-only optimization for collision feedback)
        /// </summary>
        public static BoneConsumingDelegate SetCurrentlySimulatingBone { get; private set; }

        /// <summary>
        /// Sets the call-original delegate for notifying patch
        /// </summary>
        public static BoneConsumingDelegate SetOriginalBoneUpdateDelegate { get; private set; }

        /// <summary>
        /// Excludes the given DynamicBone component from collision feedback. Colliders colliding with it won't send events.
        /// </summary>
        public static BoneConsumingDelegate ExcludeBoneFromCollisionFeedback { get; private set; }

        /// <summary>
        /// Restores collision feedback for the given DynamicBone component
        /// </summary>
        public static BoneConsumingDelegate UnExcludeBoneFromCollisionFeedback { get; private set; }

        /// <summary>
        /// Clears the list of DynamicBone components excluded from collision feedback
        /// </summary>
        public static VoidDelegate ClearExcludedBonesFromCollisionFeedback { get; private set; }

        internal static IntPtr LibDynBoneCollideEntryPoint;
        internal static IntPtr LibDynBoneUpdateSingleThreaded;
        internal static IntPtr LibDynBoneUpdateMultiThreaded;
        internal static IntPtr DynamicBoneUpdateNotifyPatch;

        internal static bool Initialize(string dllName)
        {
            var lib = LoadLibraryA(dllName);
            if (lib == IntPtr.Zero)
            {
                MelonLogger.Error("Native library load failed, mod won't work");
                return false;
            }

            SetPointersAndOffsets = GetPointer<SetPointersAndOffsetsDelegate>(lib, nameof(SetPointersAndOffsets));
            FlushColliderCache = GetPointer<VoidDelegate>(lib, nameof(FlushColliderCache));
            JoinMultithreadedJobs = GetPointer<VoidDelegate>(lib, nameof(JoinMultithreadedJobs));
            SetNumThreads = GetPointer<SetThreadNumberDelegate>(lib, nameof(SetNumThreads));

            DynamicBoneOnDestroyPatch = GetPointer<ComponentDelegate>(lib, nameof(DynamicBoneOnDestroyPatch));
            DynamicBoneOnEnablePatch = GetPointer<ComponentDelegate>(lib, nameof(DynamicBoneOnEnablePatch));
            DynamicBoneOnDisablePatch = GetPointer<ComponentDelegate>(lib, nameof(DynamicBoneOnDisablePatch));
            DynamicBoneStartPatch = GetPointer<ComponentDelegate>(lib, nameof(DynamicBoneStartPatch));
            ResetParticlePositions = GetPointer<ComponentDelegate>(lib, nameof(ResetParticlePositions));

            RegisterColliderForCollisionFeedback = GetPointer<RegisterColliderForCollisionFeedbackDelegate>(lib, nameof(RegisterColliderForCollisionFeedback));
            UnregisterColliderForCollisionFeedback = GetPointer<UnregisterColliderForCollisionFeedbackDelegate>(lib, nameof(UnregisterColliderForCollisionFeedback));
            ClearCollisionFeedbackColliders = GetPointer<VoidDelegate>(lib, nameof(ClearCollisionFeedbackColliders));
            GetAndClearCollidingGroupsMask = GetPointer<GetAndClearCollidingGroupsMaskDelegate>(lib, nameof(GetAndClearCollidingGroupsMask));

            ExcludeBoneFromCollisionFeedback = GetPointer<BoneConsumingDelegate>(lib, nameof(ExcludeBoneFromCollisionFeedback));
            UnExcludeBoneFromCollisionFeedback = GetPointer<BoneConsumingDelegate>(lib, nameof(UnExcludeBoneFromCollisionFeedback));
            SetCurrentlySimulatingBone = GetPointer<BoneConsumingDelegate>(lib, nameof(SetCurrentlySimulatingBone));
            SetOriginalBoneUpdateDelegate = GetPointer<BoneConsumingDelegate>(lib, nameof(SetOriginalBoneUpdateDelegate));
            ClearExcludedBonesFromCollisionFeedback = GetPointer<VoidDelegate>(lib, nameof(ClearExcludedBonesFromCollisionFeedback));

            LibDynBoneCollideEntryPoint = GetProcAddress(lib, "ColliderCollidePatch");
            LibDynBoneUpdateSingleThreaded = GetProcAddress(lib, "DynamicBoneUpdateSingleThreadPatch");
            LibDynBoneUpdateMultiThreaded = GetProcAddress(lib, "DynamicBoneUpdateMultiThreadPatch");
            DynamicBoneUpdateNotifyPatch = GetProcAddress(lib, "DynamicBoneUpdateNotifyPatch");

            Offsets.SetOffsets();

            return true;
        }

        private static T GetPointer<T>(IntPtr lib, string name) where T : MulticastDelegate
        {
            var result = Marshal.GetDelegateForFunctionPointer<T>(GetProcAddress(lib, name));
            if (result == null) MelonLogger.Error($"Delegate for {name} not found! Bug?");

            return result;
        }

        [DllImport("kernel32", CharSet = CharSet.Ansi, ExactSpelling = true, SetLastError = true)]
        public static extern IntPtr GetProcAddress(IntPtr hModule, string procName);

        [DllImport("kernel32", CharSet = CharSet.Ansi, ExactSpelling = true, SetLastError = true)]
        internal static extern IntPtr LoadLibraryA(string libName);
    }
}