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Packages/com.htc.upm.vive.openxr/Runtime/Features/Foveation/Scripts/ViveFoveation.cs

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+// Copyright HTC Corporation All Rights Reserved.
+
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine.XR.OpenXR;
+using UnityEngine.XR.OpenXR.Features;
+using System.Runtime.InteropServices;
+using System;
+using UnityEngine;
+
+#if UNITY_EDITOR
+using UnityEditor.XR.OpenXR.Features;
+#endif
+
+namespace VIVE.OpenXR
+{
+#if UNITY_EDITOR
+    [OpenXRFeature(UiName = "VIVE XR Foveation",
+		Desc = "Support the HTC foveation extension.",
+		Company = "HTC",
+		DocumentationLink = "..\\Documentation",
+		OpenxrExtensionStrings = kOpenxrExtensionString,
+		Version = "1.0.0",
+		BuildTargetGroups = new[] { BuildTargetGroup.Android },
+        FeatureId = featureId
+	)]
+#endif
+    public class ViveFoveation : OpenXRFeature
+    {
+		const string LOG_TAG = "VIVE.OpenXR.ViveFoveation";
+		void DEBUG(string msg) { Debug.Log(LOG_TAG + " " + msg); }
+		void WARNING(string msg) { Debug.LogWarning(LOG_TAG + " " + msg); }
+		void ERROR(string msg) { Debug.LogError(LOG_TAG + " " + msg); }
+
+		/// <summary>
+		/// Flag bits for XrFoveationDynamicFlagsHTC
+		/// </summary>
+		public const UInt64 XR_FOVEATION_DYNAMIC_LEVEL_ENABLED_BIT_HTC = 0x00000001;
+		public const UInt64 XR_FOVEATION_DYNAMIC_CLEAR_FOV_ENABLED_BIT_HTC = 0x00000002;
+		public const UInt64 XR_FOVEATION_DYNAMIC_FOCAL_CENTER_OFFSET_ENABLED_BIT_HTC = 0x00000004;
+
+		/// <summary>
+		/// The feature id string. This is used to give the feature a well known id for reference.
+		/// </summary>
+		public const string featureId = "vive.openxr.feature.foveation";
+
+		/// <summary>
+		/// OpenXR specification <see href="https://registry.khronos.org/OpenXR/specs/1.0/html/xrspec.html#XR_HTC_foveation">12.90. XR_HTC_foveation</see>.
+		/// </summary>
+		public const string kOpenxrExtensionString = "XR_HTC_foveation";
+
+		#region OpenXR Life Cycle
+		/// <summary>
+		/// Called when <see href="https://registry.khronos.org/OpenXR/specs/1.0/html/xrspec.html#xrCreateInstance">xrCreateInstance</see> is done.
+		/// </summary>
+		/// <param name="xrInstance">The created instance.</param>
+		/// <returns>True for valid <see cref="XrInstance">XrInstance</see></returns>
+		protected override bool OnInstanceCreate(ulong xrInstance)
+		{
+			if (!OpenXRRuntime.IsExtensionEnabled(kOpenxrExtensionString))
+			{
+				WARNING("OnInstanceCreate() " + kOpenxrExtensionString + " is NOT enabled.");
+				return false;
+			}
+
+			DEBUG("OnInstanceCreate() " + xrInstance);
+
+			return true;
+		}
+		#endregion
+
+		protected override IntPtr HookGetInstanceProcAddr(IntPtr func)
+		{
+			Debug.Log("EXT: registering our own xrGetInstanceProcAddr");
+            if (SystemInfo.graphicsDeviceType == UnityEngine.Rendering.GraphicsDeviceType.Vulkan)
+            {
+                Debug.Log("Vulkan no hook foveation");
+                return func;
+            }
+            return intercept_xrGetInstanceProcAddr(func);
+		}
+
+		private const string ExtLib = "viveopenxr";
+		[DllImport(ExtLib, EntryPoint = "intercept_xrGetInstanceProcAddr")]
+		private static extern IntPtr intercept_xrGetInstanceProcAddr(IntPtr func);
+
+		[DllImport(ExtLib, EntryPoint = "applyFoveationHTC")]
+		private static extern XrResult applyFoveationHTC(Foveation.XrFoveationModeHTC mode, UInt32 configCount, Foveation.XrFoveationConfigurationHTC[] configs, UInt64 flags);
+
+		/// <summary>
+		/// function to apply HTC Foveation
+		/// </summary>
+		public static XrResult ApplyFoveationHTC(Foveation.XrFoveationModeHTC mode, UInt32 configCount, Foveation.XrFoveationConfigurationHTC[] configs, UInt64 flags = 0)
+		{
+			//Debug.Log("Unity HTCFoveat:configCount " + configCount);
+			//if (configCount >=2) {
+				//Debug.Log("Unity HTCFoveat:configs[0].clearFovDegree " + configs[0].clearFovDegree);
+				//Debug.Log("Unity HTCFoveat:configs[0].level " + configs[0].level);
+				//Debug.Log("Unity HTCFoveat:configs[1].clearFovDegree " + configs[1].clearFovDegree);
+				//Debug.Log("Unity HTCFoveat:configs[1].level " + configs[1].level);
+			//}
+			return applyFoveationHTC(mode, configCount, configs, flags);
+		}
+    }
+}