private unsafe void CreateInstance(IVkSurface vkSurface, string[] requestedExtensions, string[]?validationLayers, out Instance instance)
{
nint applicationName = Info.ApplicationName.Marshal();
nint engineName = Info.EngineName.Marshal();
ApplicationInfo applicationInfo = new ApplicationInfo
{
SType = StructureType.ApplicationInfo,
PApplicationName = (byte *)applicationName,
ApplicationVersion = Info.ApplicationVersion,
PEngineName = (byte *)engineName,
EngineVersion = Info.EngineVersion,
ApiVersion = Info.APIVersion
};
string[] requiredExtensions = VKAPI.GetRequiredExtensions(vkSurface, requestedExtensions);
nint requiredExtensionsPointer = SilkMarshal.StringArrayToPtr(requiredExtensions);
nint enabledLayerNames = 0x0;
int enabledLayerCount = 0;
InstanceCreateInfo createInfo = new InstanceCreateInfo
{
SType = StructureType.InstanceCreateInfo,
PApplicationInfo = &applicationInfo,
PpEnabledExtensionNames = (byte **)requiredExtensionsPointer,
EnabledExtensionCount = (uint)requiredExtensions.Length,
PpEnabledLayerNames = (byte **)null !,
EnabledLayerCount = 0,
PNext = (void *)null !
};
if (validationLayers is not null)
{
VKAPI.VerifyValidationLayerSupport(VK, validationLayers);
enabledLayerNames = SilkMarshal.StringArrayToPtr(validationLayers);
enabledLayerCount = validationLayers.Length;
createInfo.PpEnabledLayerNames = (byte **)enabledLayerNames;
createInfo.EnabledLayerCount = (uint)enabledLayerCount;
}
Log.Information(string.Format(FormatHelper.DEFAULT_LOGGING, nameof(VulkanInstance), "allocating instance."));
Result result = VK.CreateInstance(&createInfo, (AllocationCallbacks *)null !, out instance);
if (result is not Result.Success)
{
throw new VulkanException(result, "Failed to create Vulkan instance.");
}
SilkMarshal.FreeString(applicationName);
SilkMarshal.FreeString(engineName);
SilkMarshal.FreeString(requiredExtensionsPointer);
if (enabledLayerNames is not 0x0 && enabledLayerCount is not 0)
{
SilkMarshal.FreeString(enabledLayerNames);
}
}
public static unsafe void RunApp(IReadOnlyList <string> args, IntPtr callback)
{
BeginRun();
var argsPtr = SilkMarshal.StringArrayToPtr(args);
CoreRunApp(args.Count, (byte **)argsPtr, callback);
SilkMarshal.Free(argsPtr);
EndRun();
}
public static unsafe void RunApp(IReadOnlyList <string> args, Action <string[]> callback)
{
BeginRun();
var argsPtr = SilkMarshal.StringArrayToPtr(args);
CurrentMain = (numArgs, inArgsPtr) => callback(SilkMarshal.PtrToStringArray((IntPtr)inArgsPtr, numArgs));
CoreRunApp(args.Count, (byte **)argsPtr, GetCallMainPtr());
CurrentMain = null;
SilkMarshal.Free(argsPtr);
EndRun();
}
public static unsafe void RunApp(IReadOnlyList <string> args, MainFunction callback)
{
BeginRun();
var argsPtr = SilkMarshal.StringArrayToPtr(args);
CurrentMain = callback;
CoreRunApp(args.Count, (byte **)argsPtr, GetCallMainPtr());
CurrentMain = null;
SilkMarshal.Free(argsPtr);
EndRun();
}
public static unsafe DeviceCreateInfo DeviceCreateInfo(string[] deviceExtensions, params DeviceQueueCreateInfo[] queues)
{
DeviceCreateInfo deviceCreateInfo = new()
{
SType = StructureType.DeviceCreateInfo,
EnabledLayerCount = 0,
PpEnabledLayerNames = null,
EnabledExtensionCount = (uint)deviceExtensions.Length,
PpEnabledExtensionNames = (byte **)SilkMarshal.StringArrayToPtr(deviceExtensions),
QueueCreateInfoCount = (uint)queues.Length
};
fixed(DeviceQueueCreateInfo *ptr = &queues[0])
{
deviceCreateInfo.PQueueCreateInfos = ptr;
}
return(deviceCreateInfo);
}
public static unsafe Instance CreateInstance(string[] instanceLayers, string[] instanceExtensions, IVkSurface windowSurface)
{
ApplicationInfo appInfo = new()
{
SType = StructureType.ApplicationInfo,
PApplicationName = (byte *)SilkMarshal.StringToPtr("SilkyNvg-Vulkan-Example"),
ApplicationVersion = Vk.MakeVersion(1, 0, 0),
PEngineName = (byte *)SilkMarshal.StringToPtr("SilkyNvg (Renderer: Vulkan)"),
EngineVersion = Vk.MakeVersion(1, 0, 0),
ApiVersion = Vk.Version12
};
byte **windowExtensionsPtr = windowSurface.GetRequiredExtensions(out uint windowExtensionCount);
byte **instanceExtensionsPtr = (byte **)SilkMarshal.StringArrayToPtr(instanceExtensions);
byte **extensions = stackalloc byte *[(int)windowExtensionCount + instanceExtensions.Length];
int i = 0;
for (; i < windowExtensionCount; i++)
{
extensions[i] = windowExtensionsPtr[i];
}
for (; i < windowExtensionCount + instanceExtensions.Length; i++)
{
extensions[i] = instanceExtensionsPtr[i];
}
CheckInstanceExtensionsPresent(extensions, (int)windowExtensionCount + instanceExtensions.Length);
CheckInstanceLayersPresent(instanceLayers);
byte **layers = (byte **)SilkMarshal.StringArrayToPtr(instanceLayers);
InstanceCreateInfo instanceCreateInfo = VkInit.InstanceCreateInfo(appInfo, layers,
(uint)instanceLayers.Length, extensions, windowExtensionCount);
AssertVulkan(Vk.CreateInstance(instanceCreateInfo, null, out Instance instance));
return(instance);
}
private void InitializeVulkan(string applicationName, uint applicationVersion)
{
Console.WriteLine("Initializing Vulkan");
#if VALIDITION
DebugUtilsMessengerCreateInfoEXT GetDebugMessenger(void *pNext)
{
return(new DebugUtilsMessengerCreateInfoEXT(
messageSeverity: DebugUtilsMessageSeverityFlagsEXT.DebugUtilsMessageSeverityVerboseBitExt |
DebugUtilsMessageSeverityFlagsEXT.DebugUtilsMessageSeverityInfoBitExt |
DebugUtilsMessageSeverityFlagsEXT.DebugUtilsMessageSeverityWarningBitExt |
DebugUtilsMessageSeverityFlagsEXT.DebugUtilsMessageSeverityErrorBitExt,
messageType: DebugUtilsMessageTypeFlagsEXT.DebugUtilsMessageTypeGeneralBitExt |
DebugUtilsMessageTypeFlagsEXT.DebugUtilsMessageTypePerformanceBitExt |
DebugUtilsMessageTypeFlagsEXT.DebugUtilsMessageTypeValidationBitExt,
pfnUserCallback: new PfnDebugUtilsMessengerCallbackEXT(DebugCallback), pNext: pNext));
}
#endif
_vk = Vk.GetApi();
const uint engineVersion = 1;
const string engineName = "Videre";
var instanceLayers = new List <string>();
var instanceExtensions = new List <string>();
var pApplicationName = SilkMarshal.StringToPtr(applicationName);
var pEngineName = SilkMarshal.StringToPtr(engineName);
var applicationInfo = new ApplicationInfo(pApplicationName: (byte *)pApplicationName,
applicationVersion: applicationVersion, pEngineName: (byte *)pEngineName, engineVersion: engineVersion,
apiVersion: new Version32(1, 1, 0));
Version32 apiVersion = default;
_vk.EnumerateInstanceVersion((uint *)&apiVersion);
Console.WriteLine($"Instance Version: {apiVersion.Major}.{apiVersion.Minor}.{apiVersion.Patch}");
void *instancepNext = default;
// instanceExtensions.Add(KhrSurface.ExtensionName);
instanceExtensions.AddRange(SilkMarshal.PtrToStringArray((nint)View.VkSurface.GetRequiredExtensions(out var requiredExtensionsCount), (int)requiredExtensionsCount));
instanceExtensions.Add(ExtDebugUtils.ExtensionName);
Console.WriteLine($"Creating Instance with {instanceExtensions.Count} extensions");
VerifyInstanceExtensionsAvailable(_vk, instanceExtensions);
var ppEnabledLayers = instanceLayers.Count > 0 ? (byte **)SilkMarshal.StringArrayToPtr(instanceLayers) : null;
var ppEnabledExtensions = instanceExtensions.Count > 0 ? (byte **)SilkMarshal.StringArrayToPtr(instanceExtensions) : null;
_vk.CreateInstance(
new InstanceCreateInfo(pApplicationInfo: &applicationInfo,
enabledLayerCount: (uint)instanceLayers.Count, ppEnabledLayerNames: ppEnabledLayers,
enabledExtensionCount: (uint)instanceExtensions.Count,
ppEnabledExtensionNames: ppEnabledExtensions, pNext: instancepNext), _allocationCallbacks.AllocationCallbacks, out _instance)
.ThrowCode();
SilkMarshal.Free((nint)ppEnabledLayers);
SilkMarshal.Free((nint)ppEnabledExtensions);
_vk.CurrentInstance = _instance;
if (!_vk.TryGetInstanceExtension(_instance, out _khrSurface))
{
Console.WriteLine($"Could not load {KhrSurface.ExtensionName}");
}
_vk.TryGetInstanceExtension(_instance, out _debugUtils);
Console.WriteLine("Creating Surface");
_surface = View.VkSurface.Create(_instance.ToHandle(), (AllocationCallbacks *)null).ToSurface();
uint deviceCount = 0;
_vk.EnumeratePhysicalDevices(_instance, ref deviceCount, null).ThrowCode();
var devices = (PhysicalDevice *)SilkMarshal.Allocate((int)(deviceCount * sizeof(PhysicalDevice)));
_vk.EnumeratePhysicalDevices(_instance, ref deviceCount, devices).ThrowCode();
Console.WriteLine($"Found {deviceCount} devices");
Console.WriteLine("Creating Device");
// TODO: actually somehow reasonably find the best device.
for (int i = 0; i < deviceCount; i++)
{
var physicalDevice = devices[i];
_physicalDeviceFeatures = _vk.GetPhysicalDeviceFeature(physicalDevice);
uint presentModeCount = 0;
_khrSurface.GetPhysicalDeviceSurfacePresentModes(physicalDevice, _surface, ref presentModeCount, null).ThrowCode();
if (presentModeCount <= 0)
{
continue;
}
var presentModes = (PresentModeKHR *)SilkMarshal.Allocate((int)(presentModeCount * sizeof(PresentModeKHR)));
_khrSurface.GetPhysicalDeviceSurfacePresentModes(physicalDevice, _surface, ref presentModeCount, presentModes).ThrowCode();
_presentMode = PresentModeKHR.PresentModeFifoKhr;
View.FramesPerSecond = -1;
for (int j = 0; j < presentModeCount; j++)
{
if (presentModes[j] == PresentModeKHR.PresentModeMailboxKhr)
{
_presentMode = PresentModeKHR.PresentModeMailboxKhr;
View.FramesPerSecond = -1;
break;
}
}
SilkMarshal.Free((nint)presentModes);
uint surfaceFormatCount = 0;
_khrSurface.GetPhysicalDeviceSurfaceFormats(physicalDevice, _surface, ref surfaceFormatCount, null).ThrowCode();
var surfaceFormats = (SurfaceFormatKHR *)SilkMarshal.Allocate((int)(surfaceFormatCount * sizeof(SurfaceFormatKHR)));
_khrSurface.GetPhysicalDeviceSurfaceFormats(physicalDevice, _surface, ref surfaceFormatCount, surfaceFormats).ThrowCode();
int max = int.MinValue;
SurfaceFormatKHR maxFormat = surfaceFormats[0];
for (int j = 0; j < surfaceFormatCount; j++)
{
var score = FormatRater.Rate(surfaceFormats[j].Format) + ColorSpaceRater.Rate(surfaceFormats[j].ColorSpace);
if (score > max)
{
max = score;
maxFormat = surfaceFormats[j];
}
}
SilkMarshal.Free((nint)surfaceFormats);
_swapchainFormat = maxFormat.Format;
_swapchainColorSpace = maxFormat.ColorSpace;
Console.WriteLine($"Chose Swapchain Properties: {Enum.GetName(typeof(PresentModeKHR), _presentMode)} {Enum.GetName(typeof(Format), _swapchainFormat)} {Enum.GetName(typeof(ColorSpaceKHR), _swapchainColorSpace)}");
_khrSurface.GetPhysicalDeviceSurfaceCapabilities(physicalDevice, _surface, out var surfaceCapabilities).ThrowCode();
uint queueFamilyPropertyCount = 0;
_vk.GetPhysicalDeviceQueueFamilyProperties(physicalDevice, ref queueFamilyPropertyCount, null);
var deviceQueueFamilyProperties = (QueueFamilyProperties *)SilkMarshal.Allocate((int)(queueFamilyPropertyCount * sizeof(QueueFamilyProperties)));
_vk.GetPhysicalDeviceQueueFamilyProperties(physicalDevice, ref queueFamilyPropertyCount, deviceQueueFamilyProperties);
var queueCreateInfoList = new List <DeviceQueueCreateInfo>();
var deviceExtensions = new List <string>();
var deviceLayers = new List <string>();
for (int j = 0; j < queueFamilyPropertyCount; j++)
{
var queueCount = deviceQueueFamilyProperties[j].QueueCount;
float *pQueuePriorities = stackalloc float[(int)queueCount]; // queue count should generally be 1
for (int k = 0; k < queueCount; k++)
{
pQueuePriorities[k] = 1.0f;
}
queueCreateInfoList.Add(new DeviceQueueCreateInfo(queueFamilyIndex: (uint)j, queueCount: queueCount, pQueuePriorities: pQueuePriorities));
}
deviceExtensions.Add(KhrSwapchain.ExtensionName);
// deviceExtensions.Add(KhrSynchronization2.ExtensionName);
// deviceExtensions.Add(ExtBufferDeviceAddress.ExtensionName);
var features = new PhysicalDeviceFeatures();
features.ShaderInt64 = true;
void *devicePNext = null;
// var physicalDeviceDescriptorIndexingFeaturesExt = new PhysicalDeviceDescriptorIndexingFeaturesEXT(
// descriptorBindingSampledImageUpdateAfterBind: true,
// descriptorBindingStorageBufferUpdateAfterBind: true,
// descriptorBindingStorageImageUpdateAfterBind: true,
// descriptorBindingUniformBufferUpdateAfterBind: true,
// descriptorBindingStorageTexelBufferUpdateAfterBind: true,
// descriptorBindingUniformTexelBufferUpdateAfterBind: true,
// descriptorBindingUpdateUnusedWhilePending: true,
// runtimeDescriptorArray: true,
// pNext: devicePNext);
// devicePNext = &physicalDeviceDescriptorIndexingFeaturesExt;
//
var physicalDeviceBufferDeviceAddressFeatures = new PhysicalDeviceBufferDeviceAddressFeatures(bufferDeviceAddress: true,
#if DEBUG
bufferDeviceAddressCaptureReplay: true,
#endif
pNext: devicePNext);
devicePNext = &physicalDeviceBufferDeviceAddressFeatures;
// var version12 = new PhysicalDeviceVulkan12Features(bufferDeviceAddress: true,
// #if DEBUG
// bufferDeviceAddressCaptureReplay: true,
// #endif
// descriptorBindingSampledImageUpdateAfterBind: true,
// descriptorBindingStorageBufferUpdateAfterBind: true,
// descriptorBindingStorageImageUpdateAfterBind: true,
// descriptorBindingUniformBufferUpdateAfterBind: true,
// descriptorBindingStorageTexelBufferUpdateAfterBind: true,
// descriptorBindingUniformTexelBufferUpdateAfterBind: true,
// descriptorBindingUpdateUnusedWhilePending: true,
// runtimeDescriptorArray: true,
// pNext: devicePNext);
// devicePNext = &version12;
var queueCreateInfos = queueCreateInfoList.Distinct().ToArray();
queueCreateInfoList = null;
VerifyDeviceExtensionsAvailable(_vk, devices[i], deviceExtensions, ref deviceLayers);
_physicalDevice = devices[i];
Console.WriteLine("Creating Logical Device");
var ppDeviceExtensions = deviceExtensions.Count > 0 ? (byte **)SilkMarshal.StringArrayToPtr(deviceExtensions) : null;
var ppDeviceLayers = deviceLayers.Count > 0 ? (byte **)SilkMarshal.StringArrayToPtr(deviceLayers) : null;
fixed(DeviceQueueCreateInfo *pQueueCreateInfos = queueCreateInfos)
_vk.CreateDevice(physicalDevice,
new DeviceCreateInfo(queueCreateInfoCount: (uint)queueCreateInfos.Length,
pQueueCreateInfos: pQueueCreateInfos,
enabledExtensionCount: (uint)deviceExtensions.Count,
enabledLayerCount: (uint)deviceLayers.Count,
ppEnabledExtensionNames: ppDeviceExtensions,
ppEnabledLayerNames: ppDeviceLayers, pEnabledFeatures: &features, pNext: devicePNext), null,
out _logicalDevice)
.ThrowCode();
_vk.CurrentDevice = _logicalDevice;
if (!_vk.TryGetDeviceExtension(_instance, _logicalDevice, out _khrSwapchain))
{
Console.WriteLine($"Could not load {KhrSwapchain.ExtensionName}!");
}
_queueManager = new(_vk, _khrSurface, _instance, _physicalDevice, _logicalDevice, _surface, new Span <QueueFamilyProperties>(deviceQueueFamilyProperties, (int)queueFamilyPropertyCount));
Console.WriteLine($"{_queueManager.QueueCount} queues found");
SilkMarshal.Free((nint)ppDeviceExtensions);
SilkMarshal.Free((nint)ppDeviceLayers);
SilkMarshal.Free((nint)deviceQueueFamilyProperties);
break;
}
SilkMarshal.Free((nint)devices);
Console.WriteLine("Initialized Vulkan");
}
internal unsafe VulkanLogicalDevice(Vk vk, VulkanContext context, string[] extensions, string[]?validationLayers) : base(vk)
{
_Context = context;
SwapchainExtension = GetDeviceExtension <SwapchainExtension>();
float queuePriority = 1f;
QueueFamilyIndices queueFamilyIndices = _Context.PhysicalDevice.GetQueueFamilies();
uint queueFamiliesCount = queueFamilyIndices.GetLength;
DeviceQueueCreateInfo *deviceQueueCreateInfos = stackalloc DeviceQueueCreateInfo[2];
for (int i = 0; i < queueFamiliesCount; i++)
{
Debug.Assert(queueFamilyIndices[i] != null);
deviceQueueCreateInfos[i] = new DeviceQueueCreateInfo
{
SType = StructureType.DeviceQueueCreateInfo,
QueueFamilyIndex = queueFamilyIndices[i] !.Value,
QueueCount = 1,
PQueuePriorities = &queuePriority
};
}
nint extensionsPointer = SilkMarshal.StringArrayToPtr(extensions);
nint?validationLayersPointer = null;
DeviceCreateInfo deviceCreateInfo = new DeviceCreateInfo
{
SType = StructureType.DeviceCreateInfo,
EnabledExtensionCount = (uint)extensions.Length,
PpEnabledExtensionNames = (byte **)extensionsPointer,
QueueCreateInfoCount = queueFamiliesCount,
PQueueCreateInfos = deviceQueueCreateInfos,
PEnabledFeatures = (PhysicalDeviceFeatures *)null !,
EnabledLayerCount = 0,
PpEnabledLayerNames = null
};
if (validationLayers is not null)
{
validationLayersPointer = SilkMarshal.StringArrayToPtr(validationLayers);
deviceCreateInfo.EnabledLayerCount = (uint)validationLayers.Length;
deviceCreateInfo.PpEnabledLayerNames = (byte **)validationLayersPointer.Value;
}
Result result = VK.CreateDevice(_Context.PhysicalDevice, &deviceCreateInfo, (AllocationCallbacks *)null !, out _LogicalDevice);
if (result is not Result.Success)
{
throw new VulkanException(result, "Failed to create logical device.");
}
VK.GetDeviceQueue(this, queueFamilyIndices.GraphicsFamily !.Value, 0, out _GraphicsQueue);
VK.GetDeviceQueue(this, queueFamilyIndices.PresentationFamily !.Value, 0, out _PresentationQueue);
SilkMarshal.Free(extensionsPointer);
if (validationLayersPointer is not null)
{
SilkMarshal.Free(validationLayersPointer.Value);
}
}
public unsafe Instance(Api api, Window window, uint vulkanVersion)
{
(_api, _window) = (api, window);
// Check the minimum version.
CheckVulkanMinimumVersion(vulkanVersion);
// Get the list of required extensions.
List <string> extensions = new List <string>();
extensions.AddRange(window.GetRequiredInstanceExtensions());
// Check the validation layers and add them to the list of required extensions.
if (api.DebugLoggingEnabled == false)
{
_validationLayers.Clear();
}
CheckVulkanValidationLayerSupport(_validationLayers);
if (_validationLayers.Count > 0)
{
extensions.Add(ExtDebugUtils.ExtensionName);
}
// Create the Vulkan instance.
var appInfo = new ApplicationInfo
{
SType = StructureType.ApplicationInfo,
PApplicationName = (byte *)Marshal.StringToHGlobalAnsi(nameof(RayTracingInDotNet)),
ApplicationVersion = new Version32(1, 0, 0),
PEngineName = (byte *)Marshal.StringToHGlobalAnsi($"{nameof(RayTracingInDotNet)} engine"),
EngineVersion = new Version32(1, 0, 0),
ApiVersion = vulkanVersion
};
var createInfo = new InstanceCreateInfo
{
SType = StructureType.InstanceCreateInfo,
PApplicationInfo = &appInfo,
EnabledExtensionCount = (uint)extensions.Count,
PpEnabledExtensionNames = (byte **)SilkMarshal.StringArrayToPtr(extensions.ToArray()),
EnabledLayerCount = (uint)_validationLayers.Count,
PpEnabledLayerNames = (byte **)SilkMarshal.StringArrayToPtr(_validationLayers.ToArray())
};
#if DEBUG
// For using debugPrintfEXT in shaders
var enabled = stackalloc ValidationFeatureEnableEXT[] { ValidationFeatureEnableEXT.ValidationFeatureEnableDebugPrintfExt };
var features = new ValidationFeaturesEXT
{
SType = StructureType.ValidationFeaturesExt,
DisabledValidationFeatureCount = 0,
EnabledValidationFeatureCount = 1,
PDisabledValidationFeatures = null,
PEnabledValidationFeatures = enabled,
PNext = createInfo.PNext
};
createInfo.PNext = (void *)Unsafe.AsPointer(ref features);
#endif
fixed(VkInstance *instance = &_vkInstance)
{
Util.Verify(_api.Vk.CreateInstance(&createInfo, null, instance), $"{nameof(VulkanRenderer)}: Failed to create Vulkan instance");
}
_api.Instance = this;
Marshal.FreeHGlobal((nint)appInfo.PApplicationName);
Marshal.FreeHGlobal((nint)appInfo.PEngineName);
SilkMarshal.Free((nint)createInfo.PpEnabledExtensionNames);
SilkMarshal.Free((nint)createInfo.PpEnabledLayerNames);
GetVulkanPhysicalDevices();
GetVulkanLayers();
GetVulkanExtensions();
foreach (var layer in _validationLayers)
{
_api.Logger.Debug($"{nameof(Instance)}: Validation Layer: {layer}");
}
foreach (var extension in _extensions)
{
_api.Logger.Debug($"{nameof(Instance)}: Extension: {extension}");
}
}
private unsafe void Prepare()
{
// Create our API object for OpenXR.
Xr = XR.GetApi();
Extensions.Clear();
//Extensions.Add("XR_KHR_vulkan_enable2");
Extensions.Add("XR_KHR_vulkan_enable");
Extensions.Add("XR_EXT_hp_mixed_reality_controller");
Extensions.Add("XR_HTC_vive_cosmos_controller_interaction");
Extensions.Add("XR_MSFT_hand_interaction");
Extensions.Add("XR_EXT_samsung_odyssey_controller");
uint propCount = 0;
Xr.EnumerateInstanceExtensionProperties((byte *)null, 0, &propCount, null);
ExtensionProperties[] props = new ExtensionProperties[propCount];
for (int i = 0; i < props.Length; i++)
{
props[i].Type = StructureType.TypeExtensionProperties;
fixed(ExtensionProperties *pptr = &props[0])
Xr.EnumerateInstanceExtensionProperties((byte *)null, propCount, ref propCount, pptr);
List <string> AvailableExtensions = new List <string>();
for (int i = 0; i < props.Length; i++)
{
fixed(void *nptr = props[i].ExtensionName)
AvailableExtensions.Add(Marshal.PtrToStringAnsi(new System.IntPtr(nptr)));
}
for (int i = 0; i < Extensions.Count; i++)
{
if (AvailableExtensions.Contains(Extensions[i]) == false)
{
Extensions.RemoveAt(i);
i--;
}
}
InstanceCreateInfo instanceCreateInfo;
var appInfo = new ApplicationInfo()
{
ApiVersion = new Version64(1, 0, 9)
};
// We've got to marshal our strings and put them into global, immovable memory. To do that, we use
// SilkMarshal.
Span <byte> appName = new Span <byte>(appInfo.ApplicationName, 128);
Span <byte> engName = new Span <byte>(appInfo.EngineName, 128);
SilkMarshal.StringIntoSpan(System.AppDomain.CurrentDomain.FriendlyName, appName);
SilkMarshal.StringIntoSpan("FocusEngine", engName);
var requestedExtensions = SilkMarshal.StringArrayToPtr(Extensions);
instanceCreateInfo = new InstanceCreateInfo
(
applicationInfo: appInfo,
enabledExtensionCount: (uint)Extensions.Count,
enabledExtensionNames: (byte **)requestedExtensions
);
// Now we're ready to make our instance!
CheckResult(Xr.CreateInstance(in instanceCreateInfo, ref Instance), "CreateInstance");
// For our benefit, let's log some information about the instance we've just created.
// skip this, as it crashes on Oculus runtime and is not needed
/*InstanceProperties properties = new();
* CheckResult(Xr.GetInstanceProperties(Instance, ref properties), "GetInstanceProperties");
*
* var runtimeName = SilkMarshal.PtrToString((nint)properties.RuntimeName);
* var runtimeVersion = ((Version)(Version64)properties.RuntimeVersion).ToString(3);
*
* Console.WriteLine($"[INFO] Application: Using OpenXR Runtime \"{runtimeName}\" v{runtimeVersion}");*/
// We're creating a head-mounted-display (HMD, i.e. a VR headset) example, so we ask for a runtime which
// supports that form factor. The response we get is a ulong that is the System ID.
var getInfo = new SystemGetInfo(formFactor: FormFactor.HeadMountedDisplay);
CheckResult(Xr.GetSystem(Instance, in getInfo, ref system_id), "GetSystem");
}