ViewConfig.cs

Source code

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// Copyright (c) (2023-2024) Magic Leap, Inc. All Rights Reserved.
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using System;
using Unity.Collections;
using Unity.Collections.LowLevel.Unsafe;
using UnityEngine.XR.ARSubsystems;
using UnityEngine.XR.OpenXR.NativeTypes;

namespace MagicLeap.OpenXR.ViewConfiguration
{
    internal enum StructType : ulong
    {
        ViewConfigurationDepthRange = 1000046000,
        ViewConfigurationView = 41,
    }

    internal struct XrViewConfigurationProperties
    {
        internal StructType Type;
        internal IntPtr Next;
        internal XrViewConfigurationType ConfigurationType;
    }

    internal struct XrViewConfigurationView
    {
        internal StructType Type;
        internal IntPtr Next;
        internal uint RecommendedImageRectWidth;
        internal uint MaxImageRectWidth;
        internal uint RecommendedImageRectHeight;
        internal uint MaxImageRectHeight;
        internal uint RecommendedSwapchainSampleCount;
        internal uint MaxSwapchainSampleCount;
    }

    internal struct XrViewConfigurationDepthRange
    {
        internal StructType Type;
        internal IntPtr Next;
        internal float RecommendedNearZ;
        internal float MinNearZ;
        internal float RecommendedFarZ;
        internal float MaxFarZ;
    }
    
    internal unsafe class ViewConfigNativeFunctions : NativeFunctionsBase
    {
        internal delegate* unmanaged [Cdecl] <ulong, ulong, XrViewConfigurationType, uint, out uint, XrViewConfigurationView*, XrResult> XrEnumerateViewConfigurationViews;
        protected override void LocateNativeFunctions()
        {
            XrEnumerateViewConfigurationViews = (delegate* unmanaged[Cdecl]<ulong, ulong, XrViewConfigurationType, uint, out uint, XrViewConfigurationView*, XrResult>)LocateNativeFunction("xrEnumerateViewConfigurationViews");
        }

        internal XrResult EnumerateConfigurationViews(ulong instance, ulong systemId, out XrViewConfigurationDepthRange depthRangeResult)
        {
            depthRangeResult = default;
            var xrResult = XrEnumerateViewConfigurationViews(instance, systemId, XrViewConfigurationType.PrimaryStereo, 0, out var viewConfigurationCount, null);
            if (!Utils.DidXrCallSucceed(xrResult, nameof(XrEnumerateViewConfigurationViews)))
            {
                return xrResult;
            }
            var viewConfigurationArray = new NativeArray<XrViewConfigurationView>((int)viewConfigurationCount, Allocator.Temp);
            var depthRange = new XrViewConfigurationDepthRange
            {
                Type = StructType.ViewConfigurationDepthRange,
            };
            NativeCopyUtility.FillArrayWithValue(viewConfigurationArray, new XrViewConfigurationView
            {
                Type = StructType.ViewConfigurationView,
                Next = new IntPtr(&depthRange),
            });
            xrResult = XrEnumerateViewConfigurationViews(instance, systemId, XrViewConfigurationType.PrimaryStereo, viewConfigurationCount, out viewConfigurationCount, (XrViewConfigurationView*)viewConfigurationArray.GetUnsafePtr());
            if (!Utils.DidXrCallSucceed(xrResult, nameof(XrEnumerateViewConfigurationViews)))
            {
                return xrResult;
            }
            depthRangeResult = depthRange;
            return XrResult.Success;
        }
    }
}