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fredemmott / gist:761bb5308ab694405689e6456201eaa5
Created February 1, 2026 15:04

Working on my API layer tool and I think I'm hitting "spec doesn't define either way" behavior, but I'm not certain:

If I set XR_ENABLE_API_LAYERS=XR_LAYER_this_layer_does_not_exist in my environment (to attempt to enable an invalid explicit layer)

  • xrCreateInstance() fails with XR_ERROR_API_LAYER_NOT_PRESENT - this seems correct
  • xrEnumerateApiLayerProperties without an instance succeeds - this feels wrong, but I'm not finding a clear definition of correct behavior here
@fredemmott
fredemmott / shared_recursive_mutex.hpp
Created January 3, 2026 16:13
shared recursive mutex
// Copyright 2026 Fred Emmott <[email protected]>
// SPDX-License-Identifier: MIT
#pragma once
#include <shared_mutex>
#include <thread>
#include <unordered_map>
#include "FredEmmott/GUI/assert.hpp"
@fredemmott
fredemmott / Foo.miz\OpenKneeboard.json
Last active July 31, 2025 20:52
Hypothetical DCS mission JSON for OpenKneeboard
{
"blue": {
"mission": {
"replacesDefaultImages": true,
"additionalFiles": [
"openkneeboard/blue-mission.html",
"openkneeboard/blue-mission.pdf"
]
},
"briefing": {
@fredemmott
fredemmott / heap snapshots.ps1
Last active June 11, 2025 01:51
wpr -snapshotconfig heap -name OpenKneeboardApp.exe enable
# your own wprp is optional, both are logged
wpr -start heapsnapshot -start .\OpenKneeboard.wprp -filemode
wpr -singlesnapshot heap $((get-process OpenKneeboardApp).id)
# Wait for leak, then the same again
wpr -singlesnapshot heap $((get-process OpenKneeboardApp).id)
wpr -stop c:\users\fred\trace.etl
wpr -snapshotconfig heap -name OpenKneeboardApp.exe disable
# in wpa, select both snapshots, right click, diff view. Then look at 'added'
@fredemmott
fredemmott / ufotest-blank.md
Created January 27, 2025 16:31

image

@fredemmott
fredemmott / D3D11Timer.cpp
Last active December 16, 2024 15:10
struct D3D11Timer {
D3D11Timer() = default;
explicit D3D11Timer(ID3D11Device* device) {
device->GetImmediateContext(mContext.put());
D3D11_QUERY_DESC desc {D3D11_QUERY_TIMESTAMP_DISJOINT};
device->CreateQuery(&desc, mDisjointQuery.put());
desc = {D3D11_QUERY_TIMESTAMP};
device->CreateQuery(&desc, mBeginRenderTimestampQuery.put());
device->CreateQuery(&desc, mEndRenderTimestampQuery.put());
@fredemmott
fredemmott / Program.cs
Created December 13, 2024 14:45
wixsharp-as-script
using System.CommandLine;
using System.Runtime.CompilerServices;
using WixSharp;
using WixToolset.Dtf.WindowsInstaller;
using File = WixSharp.File;
[assembly: InternalsVisibleTo(assemblyName: "XRFrameTools_Installer.aot")] // assembly name + '.aot suffix
void CreateMSI(DirectoryInfo sourceRoot)
@fredemmott
fredemmott / compile-time-string-to-guid.hpp
Created December 11, 2024 03:21
Compile time string-to-GUID
// Copyright 2024 Fred Emmott <[email protected]>
// SPDX-License-Identifier: MIT
#pragma once
// Usage:
//
// constexpr GUID TestGuid = "9add179d-b650-4eca-b471-88ab38c2bd46"_guid;
// constexpr GUID TestGuid2 = "{2f896df5-d701-42ea-ab02-cbd50af16516}"_guid;
namespace detail::compile_time_guid {
@fredemmott
fredemmott / OpenXRKneeboard.cpp.diff
Last active December 5, 2024 16:44
diff --git a/src/injectables/OpenXRKneeboard.cpp b/src/injectables/OpenXRKneeboard.cpp
index 0c3f6d51..5cdbb322 100644
--- a/src/injectables/OpenXRKneeboard.cpp
+++ b/src/injectables/OpenXRKneeboard.cpp
@@ -50,6 +50,9 @@
#include <openxr/openxr_platform.h>
#include <openxr/openxr_reflection.h>
+// From OpenXR v1.1 SDK for XrPosef_Multiply
+#include "xr_linear.h"
@fredemmott
fredemmott / HTCCSettingsApp.cpp
Last active November 23, 2024 15:44
HTCCSettingsApp skeleton - example ImGUI with Win32/D3D11
// Copyright 2024 Fred Emmott <[email protected]>
// SPDX-License-Identifier: MIT
#include <Windows.h>
#include <d3d11.h>
#include <dxgi1_3.h>
#include <imgui.h>
#include <imgui_impl_dx11.h>
#include <imgui_impl_win32.h>
#include <wil/com.h>