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NativeXr.cpp
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NativeXr.cpp
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#include <Babylon/Plugins/NativeXr.h>
#include <Babylon/JsRuntimeScheduler.h>
#include <XR.h>
#include <bx/bx.h>
#include <bx/math.h>
#include <bgfx/bgfx.h>
#include <Babylon/Graphics/DeviceContext.h>
#include <Babylon/Graphics/FrameBuffer.h>
#include <algorithm>
#include <set>
#include <memory>
#include <napi/napi.h>
#include <napi/pointer.h>
#include <arcana/threading/task.h>
#include <arcana/tracing/trace_region.h>
namespace
{
bgfx::TextureFormat::Enum XrTextureFormatToBgfxFormat(xr::TextureFormat format)
{
switch (format)
{
// Color Formats
// NOTE: Use linear formats even though XR requests sRGB to match what happens on the web.
// WebGL shaders expect sRGB output while native shaders expect linear output.
case xr::TextureFormat::BGRA8_SRGB:
return bgfx::TextureFormat::BGRA8;
case xr::TextureFormat::RGBA8_SRGB:
return bgfx::TextureFormat::RGBA8;
// Depth Formats
case xr::TextureFormat::D24S8:
return bgfx::TextureFormat::D24S8;
case xr::TextureFormat::D16:
return bgfx::TextureFormat::D16;
default:
throw std::runtime_error{"Unsupported texture format"};
}
}
// clang-format off
constexpr std::array<float, 16> IDENTITY_MATRIX{
1.f, 0.f, 0.f, 0.f,
0.f, 1.f, 0.f, 0.f,
0.f, 0.f, 1.f, 0.f,
0.f, 0.f, 0.f, 1.f
};
// clang-format on
std::array<float, 16> CreateTransformMatrix(const xr::Space& space, bool viewSpace = true)
{
auto& quat = space.Pose.Orientation;
auto& pos = space.Pose.Position;
// Quaternion to matrix from https://github.com/BabylonJS/Babylon.js/blob/v4.0.0/src/Maths/math.ts#L6245-L6283
const float xx{quat.X * quat.X};
const float yy{quat.Y * quat.Y};
const float zz{quat.Z * quat.Z};
const float xy{quat.X * quat.Y};
const float zw{quat.Z * quat.W};
const float zx{quat.Z * quat.X};
const float yw{quat.Y * quat.W};
const float yz{quat.Y * quat.Z};
const float xw{quat.X * quat.W};
auto worldSpaceTransform{IDENTITY_MATRIX};
worldSpaceTransform[0] = 1.f - (2.f * (yy + zz));
worldSpaceTransform[1] = 2.f * (xy + zw);
worldSpaceTransform[2] = 2.f * (zx - yw);
worldSpaceTransform[3] = 0.f;
worldSpaceTransform[4] = 2.f * (xy - zw);
worldSpaceTransform[5] = 1.f - (2.f * (zz + xx));
worldSpaceTransform[6] = 2.f * (yz + xw);
worldSpaceTransform[7] = 0.f;
worldSpaceTransform[8] = 2.f * (zx + yw);
worldSpaceTransform[9] = 2.f * (yz - xw);
worldSpaceTransform[10] = 1.f - (2.f * (yy + xx));
worldSpaceTransform[11] = 0.f;
// Insert position into rotation matrix.
worldSpaceTransform[12] = pos.X;
worldSpaceTransform[13] = pos.Y;
worldSpaceTransform[14] = pos.Z;
worldSpaceTransform[15] = 1.f;
if (viewSpace)
{
// Invert to get the view space transform.
std::array<float, 16> viewSpaceTransform{};
bx::mtxInverse(viewSpaceTransform.data(), worldSpaceTransform.data());
return viewSpaceTransform;
}
else
{
return worldSpaceTransform;
}
}
constexpr std::array<const char*, 25> HAND_JOINT_NAMES{
"wrist",
"thumb-metacarpal",
"thumb-phalanx-proximal",
"thumb-phalanx-distal",
"thumb-tip",
"index-finger-metacarpal",
"index-finger-phalanx-proximal",
"index-finger-phalanx-intermediate",
"index-finger-phalanx-distal",
"index-finger-tip",
"middle-finger-metacarpal",
"middle-finger-phalanx-proximal",
"middle-finger-phalanx-intermediate",
"middle-finger-phalanx-distal",
"middle-finger-tip",
"ring-finger-metacarpal",
"ring-finger-phalanx-proximal",
"ring-finger-phalanx-intermediate",
"ring-finger-phalanx-distal",
"ring-finger-tip",
"pinky-finger-metacarpal",
"pinky-finger-phalanx-proximal",
"pinky-finger-phalanx-intermediate",
"pinky-finger-phalanx-distal",
"pinky-finger-tip"};
void SetXRInputSourceData(Napi::Object& jsInputSource, xr::System::Session::Frame::InputSource& inputSource)
{
auto env = jsInputSource.Env();
jsInputSource.Set("targetRaySpace", Napi::External<xr::Space>::New(env, &inputSource.AimSpace));
jsInputSource.Set("gripSpace", Napi::External<xr::Space>::New(env, &inputSource.GripSpace));
// Don't set hands up unless hand data is supported/available
if (inputSource.HandTrackedThisFrame || inputSource.JointsTrackedThisFrame)
{
auto profiles = Napi::Array::New(env, 2);
profiles.Set(uint32_t{0}, Napi::String::New(env, "generic-hand-select-grasp"));
profiles.Set(uint32_t{1}, Napi::String::New(env, "generic-hand-select"));
jsInputSource.Set("profiles", profiles);
if (inputSource.JointsTrackedThisFrame)
{
const auto shouldInitHand = !jsInputSource.Has("hand");
auto handJointCollection = shouldInitHand ? Napi::Array::New(env, HAND_JOINT_NAMES.size()) : jsInputSource.Get("hand").As<Napi::Array>();
if (shouldInitHand)
{
auto jointGetter = [handJointCollection](const Napi::CallbackInfo& info) -> Napi::Value {
return handJointCollection.Get(info[0].As<Napi::String>());
};
handJointCollection.Set("get", Napi::Function::New(env, jointGetter, "get"));
handJointCollection.Set("size", static_cast<int>(HAND_JOINT_NAMES.size()));
jsInputSource.Set("hand", handJointCollection);
}
for (size_t i = 0; i < HAND_JOINT_NAMES.size(); i++)
{
auto napiJoint = Napi::External<xr::System::Session::Frame::JointSpace>::New(env, &inputSource.HandJoints[i]);
handJointCollection.Set(HAND_JOINT_NAMES[i], napiJoint);
}
}
else
{
// If hand joints aren't available on a hand input, send a null hand object
jsInputSource.Set("hand", env.Null());
}
}
}
void SetXRGamepadObjectData(Napi::Object& jsInputSource, Napi::Object& jsGamepadObject, xr::System::Session::Frame::InputSource& inputSource)
{
auto env = jsInputSource.Env();
//Set Gamepad Object
auto gamepadButtons = Napi::Array::New(env, inputSource.GamepadObject.Buttons.size());
for (size_t i = 0; i < inputSource.GamepadObject.Buttons.size(); i++)
{
auto gamepadButton = Napi::Object::New(env);
auto napiGamepadPressed = Napi::Boolean::New(env, inputSource.GamepadObject.Buttons[i].Pressed);
auto napiGamepadTouched = Napi::Boolean::New(env, inputSource.GamepadObject.Buttons[i].Touched);
auto napiGamepadValue = Napi::Number::New(env, inputSource.GamepadObject.Buttons[i].Value);
gamepadButton.Set("pressed", napiGamepadPressed);
gamepadButton.Set("touched", napiGamepadTouched);
gamepadButton.Set("value", napiGamepadValue);
gamepadButtons.Set(static_cast<int>(i), gamepadButton);
}
jsGamepadObject.Set("buttons", gamepadButtons);
auto gamepadAxes = Napi::Array::New(env, inputSource.GamepadObject.Axes.size());
for (size_t i = 0; i < inputSource.GamepadObject.Axes.size(); i++)
{
auto napiGamepadAxesValue = Napi::Number::New(env, inputSource.GamepadObject.Axes[i]);
gamepadAxes.Set(static_cast<int>(i), napiGamepadAxesValue);
}
jsGamepadObject.Set("axes", gamepadAxes);
jsInputSource.Set("gamepad", jsGamepadObject);
}
Napi::ObjectReference CreateXRInputSource(xr::System::Session::Frame::InputSource& inputSource, Napi::Env& env)
{
constexpr std::array<const char*, 2> HANDEDNESS_STRINGS{
"left",
"right"};
constexpr const char* TARGET_RAY_MODE{"tracked-pointer"};
auto jsInputSource = Napi::Object::New(env);
jsInputSource.Set("handedness", Napi::String::New(env, HANDEDNESS_STRINGS[static_cast<size_t>(inputSource.Handedness)]));
jsInputSource.Set("targetRayMode", TARGET_RAY_MODE);
auto profiles = Napi::Array::New(env, 1);
Napi::Value string = Napi::String::New(env, "generic-trigger-squeeze-touchpad-thumbstick");
profiles.Set(uint32_t{0}, string);
jsInputSource.Set("profiles", profiles);
SetXRInputSourceData(jsInputSource, inputSource);
return Napi::Persistent(jsInputSource);
}
void PopulateDetectionBoundary(const Napi::Object& object, xr::DetectionBoundary& detectionBoundary)
{
if (object.Has("type"))
{
const std::map<std::string, xr::DetectionBoundaryType> detectionBoundaryTypeMap{
{"box", xr::DetectionBoundaryType::Box},
{"frustum", xr::DetectionBoundaryType::Frustum},
{"sphere", xr::DetectionBoundaryType::Sphere}};
detectionBoundary.Type = detectionBoundaryTypeMap.at(object.Get("type").As<Napi::String>());
}
switch (detectionBoundary.Type)
{
case xr::DetectionBoundaryType::Box:
if (object.Has("extent"))
{
const auto& vector = object.Get("extent").As<Napi::Object>();
xr::Vector3f boxDimensions{};
boxDimensions.X = vector.Get("x").As<Napi::Number>();
boxDimensions.Y = vector.Get("y").As<Napi::Number>();
boxDimensions.Z = vector.Get("z").As<Napi::Number>();
detectionBoundary.Data = boxDimensions;
}
break;
case xr::DetectionBoundaryType::Frustum:
if (object.Has("frustum"))
{
const auto& frustum = object.Get("frustum").As<Napi::Object>();
xr::Frustum frustumData{};
frustumData.FarDistance = frustum.Get("farDistance").As<Napi::Number>();
const auto& vector = frustum.Get("position").As<Napi::Object>();
frustumData.Pose.Position.X = vector.Get("x").As<Napi::Number>();
frustumData.Pose.Position.Y = vector.Get("y").As<Napi::Number>();
frustumData.Pose.Position.Z = vector.Get("z").As<Napi::Number>();
const auto& quaternion = frustum.Get("orientation").As<Napi::Object>();
frustumData.Pose.Orientation.X = quaternion.Get("x").As<Napi::Number>();
frustumData.Pose.Orientation.Y = quaternion.Get("y").As<Napi::Number>();
frustumData.Pose.Orientation.Z = quaternion.Get("z").As<Napi::Number>();
frustumData.Pose.Orientation.W = quaternion.Get("w").As<Napi::Number>();
const auto& fov = frustum.Get("fieldOfView").As<Napi::Object>();
frustumData.FOV.AngleLeft = fov.Get("angleLeft").As<Napi::Number>();
frustumData.FOV.AngleRight = fov.Get("angleRight").As<Napi::Number>();
frustumData.FOV.AngleUp = fov.Get("angleUp").As<Napi::Number>();
frustumData.FOV.AngleDown = fov.Get("angleDown").As<Napi::Number>();
frustumData.FarDistance = frustum.Get("farDistance").As<Napi::Number>();
detectionBoundary.Data = frustumData;
}
break;
case xr::DetectionBoundaryType::Sphere:
if (object.Has("radius"))
{
detectionBoundary.Data = object.Get("radius").As<Napi::Number>();
}
break;
}
}
xr::GeometryDetectorOptions CreateDetectorOptions(const Napi::Object& object)
{
xr::GeometryDetectorOptions options{};
if (object.Has("updateInterval"))
{
options.UpdateInterval = object.Get("updateInterval").As<Napi::Number>();
}
if (object.Has("detectionBoundary"))
{
const auto& detectionBoundary = object.Get("detectionBoundary").As<Napi::Object>();
PopulateDetectionBoundary(detectionBoundary, options.DetectionBoundary);
}
return options;
}
void CreateXRGamepadObject(Napi::Object& jsInputSource, xr::System::Session::Frame::InputSource& inputSource)
{
auto env = jsInputSource.Env();
auto jsGamepadObject = Napi::Object::New(env);
SetXRGamepadObjectData(jsInputSource, jsGamepadObject, inputSource);
}
}
// NativeXr implementation proper.
namespace Babylon
{
namespace Plugins
{
class NativeXr::Impl final : public std::enable_shared_from_this<NativeXr::Impl>
{
public:
explicit Impl(Napi::Env);
void UpdateWindow(void* windowPtr);
void SetSessionStateChangedCallback(std::function<void(bool)> callback);
arcana::task<void, std::exception_ptr> BeginSessionAsync();
arcana::task<void, std::exception_ptr> EndSessionAsync();
void ScheduleFrame(std::function<void(const xr::System::Session::Frame&)>&& callback);
void SetRenderTextureFunctions(const Napi::Function& createFunction, const Napi::Function& destroyFunction)
{
m_sessionState->CreateRenderTexture = Napi::Persistent(createFunction);
m_sessionState->DestroyRenderTexture = Napi::Persistent(destroyFunction);
}
Napi::Value GetRenderTargetForViewIndex(uint32_t viewIndex) const
{
const auto& activeViewConfigs = m_sessionState->ActiveViewConfigurations;
if (activeViewConfigs.size() <= viewIndex ||
activeViewConfigs[viewIndex] == nullptr ||
!activeViewConfigs[viewIndex]->Initialized)
{
return m_env.Null();
}
const auto viewConfig = activeViewConfigs[viewIndex];
const auto startViewIdx = m_sessionState->ViewConfigurationStartViewIdx[viewConfig];
return viewConfig->JsTextures[viewConfig->FrameBuffers[viewIndex - startViewIdx]].Value();
}
void SetDepthsNarFar(float depthNear, float depthFar)
{
m_sessionState->Session->SetDepthsNearFar(depthNear, depthFar);
}
void SetPlaneDetectionEnabled(bool enabled)
{
m_sessionState->Session->SetPlaneDetectionEnabled(enabled);
}
bool TrySetFeaturePointCloudEnabled(bool enabled)
{
return m_sessionState->Session->TrySetFeaturePointCloudEnabled(enabled);
}
bool TrySetPreferredPlaneDetectorOptions(const xr::GeometryDetectorOptions& options)
{
return m_sessionState->Session->TrySetPreferredPlaneDetectorOptions(options);
}
bool TrySetMeshDetectorEnabled(const bool enabled)
{
return m_sessionState->Session->TrySetMeshDetectorEnabled(enabled);
}
bool TrySetPreferredMeshDetectorOptions(const xr::GeometryDetectorOptions& options)
{
return m_sessionState->Session->TrySetPreferredMeshDetectorOptions(options);
}
std::vector<xr::ImageTrackingScore>* GetImageTrackingScores()
{
return m_sessionState->Session->GetImageTrackingScores();
}
void CreateAugmentedImageDatabase(const std::vector<xr::System::Session::ImageTrackingRequest>& requests)
{
m_sessionState->Session->CreateAugmentedImageDatabase(requests);
}
uintptr_t GetNativeXrContext()
{
return m_system.GetNativeXrContext();
}
std::string GetNativeXrContextType()
{
return m_system.GetNativeXrContextType();
}
private:
Napi::Env m_env;
JsRuntimeScheduler m_runtimeScheduler;
std::mutex m_sessionStateChangedCallbackMutex{};
std::function<void(bool)> m_sessionStateChangedCallback{};
void* m_windowPtr{};
std::optional<arcana::task<void, std::exception_ptr>> m_beginTask{};
arcana::task<void, std::exception_ptr> m_endTask{arcana::task_from_result<std::exception_ptr>()};
struct ViewConfiguration final
{
void* ColorTexturePointer{nullptr};
void* DepthTexturePointer{nullptr};
xr::Size ViewTextureSize{};
std::vector<Graphics::FrameBuffer*> FrameBuffers{};
std::map<Graphics::FrameBuffer*, Napi::ObjectReference> JsTextures{};
bool Initialized{false};
};
struct SessionState final
{
explicit SessionState(Graphics::DeviceContext& graphicsContext)
: GraphicsContext{graphicsContext}
, Update{GraphicsContext.GetUpdate("update")}
{
}
Graphics::DeviceContext& GraphicsContext;
Graphics::Update Update;
Napi::FunctionReference CreateRenderTexture{};
Napi::FunctionReference DestroyRenderTexture{};
std::vector<ViewConfiguration*> ActiveViewConfigurations{};
std::unordered_map<ViewConfiguration*, uint32_t> ViewConfigurationStartViewIdx{};
std::unordered_map<void*, ViewConfiguration> TextureToViewConfigurationMap{};
std::shared_ptr<xr::System::Session> Session{};
std::unique_ptr<xr::System::Session::Frame> Frame{};
arcana::cancellation_source CancellationSource{};
bool FrameScheduled{false};
std::vector<std::function<void(const xr::System::Session::Frame&)>> ScheduleFrameCallbacks{};
arcana::task<void, std::exception_ptr> FrameTask{arcana::task_from_result<std::exception_ptr>()};
};
std::unique_ptr<SessionState> m_sessionState{};
xr::System m_system{};
void BeginFrame();
void BeginUpdate();
void EndUpdate();
void EndFrame();
void NotifySessionStateChanged(bool isSessionActive);
};
NativeXr::Impl::Impl(Napi::Env env)
: m_env{env}
, m_runtimeScheduler{Babylon::JsRuntime::GetFromJavaScript(env)}
{
}
void NativeXr::Impl::UpdateWindow(void* windowPtr)
{
m_windowPtr = windowPtr;
}
void NativeXr::Impl::SetSessionStateChangedCallback(std::function<void(bool)> callback)
{
{
std::lock_guard<std::mutex> lock{m_sessionStateChangedCallbackMutex};
m_sessionStateChangedCallback = std::move(callback);
}
NotifySessionStateChanged(m_sessionState != nullptr);
}
void NativeXr::Impl::NotifySessionStateChanged(bool isSessionActive)
{
std::unique_lock<std::mutex> lock{m_sessionStateChangedCallbackMutex};
auto sessionStateChangedCallback{m_sessionStateChangedCallback};
lock.unlock();
if (sessionStateChangedCallback)
{
sessionStateChangedCallback(isSessionActive);
}
}
arcana::task<void, std::exception_ptr> NativeXr::Impl::BeginSessionAsync()
{
if (m_beginTask)
{
return arcana::task_from_error<void>(std::make_exception_ptr(std::runtime_error{"There is already an immersive XR session either currently active or in the process of being set up. There can only be one immersive XR session at a time."}));
}
Graphics::DeviceContext& context = Graphics::DeviceContext::GetFromJavaScript(m_env);
// Don't try to start a session while it is still ending.
m_beginTask.emplace(m_endTask.then(context.AfterRenderScheduler(), arcana::cancellation::none(),
[this, thisRef{shared_from_this()}, &context]() {
assert(m_sessionState == nullptr);
m_sessionState = std::make_unique<SessionState>(context);
if (!m_system.IsInitialized() &&
!m_system.TryInitialize())
{
throw std::runtime_error{"Failed to initialize xr system."};
}
return xr::System::Session::CreateAsync(m_system, bgfx::getInternalData()->context, bgfx::getInternalData()->commandQueue, [this, thisRef{shared_from_this()}] { return m_windowPtr; })
.then(m_sessionState->GraphicsContext.AfterRenderScheduler(), arcana::cancellation::none(), [this, thisRef{shared_from_this()}](std::shared_ptr<xr::System::Session> session) {
m_sessionState->Session = std::move(session);
NotifySessionStateChanged(true);
});
}));
return m_beginTask.value();
}
arcana::task<void, std::exception_ptr> NativeXr::Impl::EndSessionAsync()
{
assert(m_beginTask);
assert(m_sessionState != nullptr);
m_sessionState->CancellationSource.cancel();
m_sessionState->ActiveViewConfigurations.clear();
m_sessionState->ViewConfigurationStartViewIdx.clear();
m_sessionState->TextureToViewConfigurationMap.clear();
m_sessionState->ScheduleFrameCallbacks.clear();
m_sessionState->CreateRenderTexture.Reset();
// Don't try to end the session while it is still starting.
m_endTask = m_beginTask->then(arcana::inline_scheduler, arcana::cancellation::none(), [this, thisRef{shared_from_this()}] {
// Also don't try to end the session while a frame is in progress.
return m_sessionState->FrameTask;
})
.then(m_sessionState->GraphicsContext.AfterRenderScheduler(), arcana::cancellation::none(), [this, thisRef{shared_from_this()}](const arcana::expected<void, std::exception_ptr>&) {
assert(m_sessionState != nullptr);
assert(m_sessionState->Session != nullptr);
assert(m_sessionState->Frame == nullptr);
m_sessionState->Session->RequestEndSession();
bool shouldEndSession{};
bool shouldRestartSession{};
do
{
// Block and burn frames until XR successfully shuts down.
m_sessionState->Frame = m_sessionState->Session->GetNextFrame(shouldEndSession, shouldRestartSession);
m_sessionState->Frame.reset();
}
while (!shouldEndSession);
m_sessionState.reset();
m_beginTask.reset();
NotifySessionStateChanged(false);
});
return m_endTask;
}
void NativeXr::Impl::ScheduleFrame(std::function<void(const xr::System::Session::Frame&)>&& callback)
{
if (m_sessionState->FrameScheduled)
{
return;
}
m_sessionState->FrameScheduled = true;
// REVIEW: This should technically be before the check for m_frameScheduled, but for some
// reason requestAnimationFrame is being called twice when starting XR.
m_sessionState->ScheduleFrameCallbacks.emplace_back(callback);
m_sessionState->FrameTask = arcana::make_task(m_sessionState->Update.Scheduler(), m_sessionState->CancellationSource, [this, thisRef{shared_from_this()}] {
BeginFrame();
return arcana::make_task(m_runtimeScheduler, m_sessionState->CancellationSource, [this, updateToken{m_sessionState->Update.GetUpdateToken()}, thisRef{shared_from_this()}]() {
m_sessionState->FrameScheduled = false;
BeginUpdate();
{
arcana::trace_region scheduleRegion{"NativeXR::ScheduleFrame invoke JS callbacks"};
auto callbacks{std::move(m_sessionState->ScheduleFrameCallbacks)};
for (auto& callback : callbacks)
{
callback(*m_sessionState->Frame);
}
}
EndUpdate();
}).then(arcana::inline_scheduler, m_sessionState->CancellationSource, [this, thisRef{shared_from_this()}](const arcana::expected<void, std::exception_ptr>& result) {
if (!m_sessionState->CancellationSource.cancelled() && result.has_error())
{
Napi::Error::New(m_env, result.error()).ThrowAsJavaScriptException();
}
}).then(m_sessionState->GraphicsContext.AfterRenderScheduler(), arcana::cancellation::none(), [this, thisRef{shared_from_this()}](const arcana::expected<void, std::exception_ptr>&) {
EndFrame();
});
});
}
void NativeXr::Impl::BeginFrame()
{
assert(m_sessionState != nullptr);
assert(m_sessionState->Session != nullptr);
assert(m_sessionState->Frame == nullptr);
arcana::trace_region beginFrameRegion{"NativeXR::BeginFrame"};
bool shouldEndSession{};
bool shouldRestartSession{};
m_sessionState->Frame = m_sessionState->Session->GetNextFrame(shouldEndSession, shouldRestartSession, [this](void* texturePointer) {
return arcana::make_task(m_runtimeScheduler, arcana::cancellation::none(), [this, texturePointer]() {
const auto itViewConfig{m_sessionState->TextureToViewConfigurationMap.find(texturePointer)};
if (itViewConfig != m_sessionState->TextureToViewConfigurationMap.end())
{
auto& viewConfig = itViewConfig->second;
auto& frameBuffers = viewConfig.FrameBuffers;
for (const auto& frameBuffer : frameBuffers)
{
auto& jsTexture = viewConfig.JsTextures[frameBuffer];
m_sessionState->DestroyRenderTexture.Call({jsTexture.Value()});
}
m_sessionState->TextureToViewConfigurationMap.erase(texturePointer);
}
}).then(m_sessionState->GraphicsContext.AfterRenderScheduler(), arcana::cancellation::none(), [] {}); // Ensure continuations run on the render thread if they use inline_scheduler.
});
// Ending a session outside of calls to EndSessionAsync() is currently not supported.
assert(!shouldEndSession);
assert(m_sessionState->Frame != nullptr);
}
void NativeXr::Impl::BeginUpdate()
{
arcana::trace_region beginUpdateRegion{"NativeXR::BeginUpdate"};
m_sessionState->ActiveViewConfigurations.resize(m_sessionState->Frame->Views.size());
for (uint32_t viewIdx = 0; viewIdx < m_sessionState->Frame->Views.size(); viewIdx++)
{
const auto& view = m_sessionState->Frame->Views[viewIdx];
const auto& it{m_sessionState->TextureToViewConfigurationMap.find(view.ColorTexturePointer)};
if (it == m_sessionState->TextureToViewConfigurationMap.end() ||
it->second.ViewTextureSize.Width != view.ColorTextureSize.Width ||
it->second.ViewTextureSize.Height != view.ColorTextureSize.Height ||
it->second.ViewTextureSize.Depth != view.ColorTextureSize.Depth)
{
auto& viewConfig = m_sessionState->TextureToViewConfigurationMap[view.ColorTexturePointer] = {};
m_sessionState->ActiveViewConfigurations[viewIdx] = &viewConfig;
m_sessionState->ViewConfigurationStartViewIdx[&viewConfig] = viewIdx;
viewConfig.ColorTexturePointer = view.ColorTexturePointer;
viewConfig.DepthTexturePointer = view.DepthTexturePointer;
viewConfig.ViewTextureSize = view.ColorTextureSize;
// If a texture width or height is 0, bgfx will assert (can't create 0 sized texture). Asserting here instead of deeper in bgfx rendering.
// Depth (numLayers) can be 0, bgfx will just reinterpret it as max(numLayers, 1).
assert(view.ColorTextureSize.Width != 0);
assert(view.ColorTextureSize.Height != 0);
assert(view.ColorTextureSize.Width == view.DepthTextureSize.Width);
assert(view.ColorTextureSize.Height == view.DepthTextureSize.Height);
assert(view.ColorTextureSize.Depth == view.DepthTextureSize.Depth);
const auto textureWidth = static_cast<uint16_t>(view.ColorTextureSize.Width);
const auto textureHeight = static_cast<uint16_t>(view.ColorTextureSize.Height);
const auto textureLayers = std::max(static_cast<uint16_t>(1), static_cast<uint16_t>(view.ColorTextureSize.Depth));
// Create textures with the desired size. It will be freed and replaced with overrideInternal call
// This is mandatory as overrideInternal do not update texture size.
// And size is used for determining viewport when rendering to texture.
auto colorTextureFormat = XrTextureFormatToBgfxFormat(view.ColorTextureFormat);
auto colorTexture = bgfx::createTexture2D(textureWidth, textureHeight, false, textureLayers, colorTextureFormat, BGFX_TEXTURE_RT);
m_sessionState->GraphicsContext.AddTexture(colorTexture, textureWidth, textureHeight, false, textureLayers, colorTextureFormat);
auto depthTextureFormat = XrTextureFormatToBgfxFormat(view.DepthTextureFormat);
auto depthTexture = bgfx::createTexture2D(textureWidth, textureHeight, false, textureLayers, depthTextureFormat, BGFX_TEXTURE_RT);
m_sessionState->GraphicsContext.AddTexture(depthTexture, textureWidth, textureHeight, false, textureLayers, depthTextureFormat);
auto requiresAppClear = view.RequiresAppClear;
arcana::make_task(m_sessionState->GraphicsContext.AfterRenderScheduler(), arcana::cancellation::none(), [colorTexture, depthTexture, &viewConfig]() {
bgfx::overrideInternal(colorTexture, reinterpret_cast<uintptr_t>(viewConfig.ColorTexturePointer));
bgfx::overrideInternal(depthTexture, reinterpret_cast<uintptr_t>(viewConfig.DepthTexturePointer));
}).then(m_runtimeScheduler, m_sessionState->CancellationSource, [this, thisRef{shared_from_this()}, colorTexture, depthTexture, requiresAppClear, &viewConfig]() {
const auto eyeCount = std::max(static_cast<uint16_t>(1), static_cast<uint16_t>(viewConfig.ViewTextureSize.Depth));
// TODO (rgerd): Remove old framebuffers from resource table?
viewConfig.FrameBuffers.resize(eyeCount);
for (uint16_t eyeIdx = 0; eyeIdx < eyeCount; eyeIdx++)
{
std::array<bgfx::Attachment, 2> attachments{};
attachments[0].init(colorTexture, bgfx::Access::Write, eyeIdx);
attachments[1].init(depthTexture, bgfx::Access::Write, eyeIdx);
auto frameBufferHandle = bgfx::createFrameBuffer(static_cast<uint8_t>(attachments.size()), attachments.data(), false);
const auto frameBufferPtr = new Graphics::FrameBuffer(
m_sessionState->GraphicsContext,
frameBufferHandle,
static_cast<uint16_t>(viewConfig.ViewTextureSize.Width),
static_cast<uint16_t>(viewConfig.ViewTextureSize.Height),
true,
true,
true);
auto& frameBuffer = *frameBufferPtr;
// WebXR, at least in its current implementation, specifies an implicit default clear to black.
// https://immersive-web.github.io/webxr/#xrwebgllayer-interface
frameBuffer.Clear(*m_sessionState->Update.GetUpdateToken().GetEncoder(), BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH | BGFX_CLEAR_STENCIL, 0, 1.0f, 0);
viewConfig.FrameBuffers[eyeIdx] = frameBufferPtr;
auto jsWidth{Napi::Value::From(m_env, viewConfig.ViewTextureSize.Width)};
auto jsHeight{Napi::Value::From(m_env, viewConfig.ViewTextureSize.Height)};
auto jsFrameBuffer{Napi::Pointer<Graphics::FrameBuffer>::Create(m_env, frameBufferPtr, Napi::NapiPointerDeleter(frameBufferPtr))};
viewConfig.JsTextures[frameBufferPtr] = Napi::Persistent(m_sessionState->CreateRenderTexture.Call({jsWidth, jsHeight, jsFrameBuffer}).As<Napi::Object>());
// OpenXR doesn't pre-clear textures, and so we need to make sure the render target gets cleared before rendering the scene.
// ARCore and ARKit effectively pre-clear by pre-compositing the camera feed.
if (requiresAppClear)
{
viewConfig.JsTextures[frameBufferPtr].Set("skipInitialClear", false);
}
}
viewConfig.Initialized = true;
}).then(arcana::inline_scheduler, m_sessionState->CancellationSource, [env{m_env}](const arcana::expected<void, std::exception_ptr>& result) {
if (result.has_error())
{
Napi::Error::New(env, result.error()).ThrowAsJavaScriptException();
}
});
}
else
{
auto& viewConfig = it->second;
m_sessionState->ActiveViewConfigurations[viewIdx] = &viewConfig;
m_sessionState->ViewConfigurationStartViewIdx.try_emplace(&viewConfig, viewIdx);
}
}
}
void NativeXr::Impl::EndUpdate()
{
arcana::trace_region endUpdateRegion{"NativeXR::EndUpdate"};
m_sessionState->ActiveViewConfigurations.clear();
m_sessionState->ViewConfigurationStartViewIdx.clear();
}
void NativeXr::Impl::EndFrame()
{
assert(m_sessionState != nullptr);
assert(m_sessionState->Session != nullptr);
assert(m_sessionState->Frame != nullptr);
arcana::trace_region endFrameRegion{"NativeXR::EndFrame"};
m_sessionState->Frame.reset();
}
}
namespace
{
class XRFrame;
struct XRSessionType
{
static constexpr auto IMMERSIVE_VR{"immersive-vr"};
static constexpr auto IMMERSIVE_AR{"immersive-ar"};
static constexpr auto INLINE{"inline"};
};
struct XRReferenceSpaceType
{
static constexpr auto VIEWER{"viewer"};
// static constexpr auto LOCAL{"local"};
// static constexpr auto LOCAL_FLOOR{"local-floor"};
// static constexpr auto BOUNDED_FLOOR{"bounded-floor"};
static constexpr auto UNBOUNDED{"unbounded"};
};
struct XRHitTestTrackableType
{
static constexpr auto POINT{"point"};
static constexpr auto PLANE{"plane"};
static constexpr auto MESH{"mesh"};
};
struct XRImageTrackingState
{
//static constexpr auto UNTRACKED{"untracked"};
static constexpr auto TRACKED{"tracked"};
static constexpr auto EMULATED{"emulated"};
};
struct XREye
{
static constexpr auto NONE{"none"};
static constexpr auto LEFT{"left"};
static constexpr auto RIGHT{"right"};
static auto IndexToEye(size_t idx)
{
switch (idx)
{
case 0:
return LEFT;
case 1:
return RIGHT;
case 2:
return NONE;
default:
throw std::runtime_error{"Unsupported index"};
}
}
static uint32_t EyeToIndex(const std::string& eye)
{
if (eye == LEFT)
{
return 0;
}
else if (eye == RIGHT)
{
return 1;
}
else if (eye == NONE)
{
return 2;
}
else
{
throw std::runtime_error{"Unsupported eye"};
}
}
};
class PointerEvent : public Napi::ObjectWrap<PointerEvent>
{
static constexpr auto JS_CLASS_NAME = "PointerEvent";
public:
static void Initialize(Napi::Env& env)
{
Napi::Function func = DefineClass(
env,
JS_CLASS_NAME,
{});
env.Global().Set(JS_CLASS_NAME, func);
}
static Napi::Object New(const Napi::CallbackInfo& info)
{
return info.Env().Global().Get(JS_CLASS_NAME).As<Napi::Function>().New({});
}
PointerEvent(const Napi::CallbackInfo& info)
: Napi::ObjectWrap<PointerEvent>{info}
{
auto thisObject = info.This().As<Napi::Object>();
Napi::Object params = info[1].As<Napi::Object>();
thisObject.Set("pointerId", params.Get("pointerId"));
thisObject.Set("pointerType", params.Get("pointerType"));
}
};
class XRWebGLBinding : public Napi::ObjectWrap<XRWebGLBinding>
{
static constexpr auto JS_CLASS_NAME = "XRWebGLBinding";
public:
static void Initialize(Napi::Env env)
{
Napi::HandleScope scope{env};
Napi::Function func = DefineClass(
env,
JS_CLASS_NAME,
{});
env.Global().Set(JS_CLASS_NAME, func);
}
static Napi::Object New(const Napi::CallbackInfo& info)
{
return info.Env().Global().Get(JS_CLASS_NAME).As<Napi::Function>().New({});
}
XRWebGLBinding(const Napi::CallbackInfo& info)
: Napi::ObjectWrap<XRWebGLBinding>{info}
{
}
};
class XRWebGLLayer : public Napi::ObjectWrap<XRWebGLLayer>
{
static constexpr auto JS_CLASS_NAME = "XRWebGLLayer";
public:
static void Initialize(Napi::Env env)
{
Napi::HandleScope scope{env};
Napi::Function func = DefineClass(
env,
JS_CLASS_NAME,
{
InstanceMethod("getViewport", &XRWebGLLayer::GetViewport),
});
env.Global().Set(JS_CLASS_NAME, func);
}
static Napi::Object New(const Napi::CallbackInfo& info)
{
return info.Env().Global().Get(JS_CLASS_NAME).As<Napi::Function>().New({});
}
XRWebGLLayer(const Napi::CallbackInfo& info)
: Napi::ObjectWrap<XRWebGLLayer>{info}
{
}
private:
Napi::Value GetViewport(const Napi::CallbackInfo& info)
{
return info.This().As<Napi::Object>().Get("viewport");
}
};
class XRRigidTransform : public Napi::ObjectWrap<XRRigidTransform>
{
static constexpr auto JS_CLASS_NAME = "XRRigidTransform";
// static constexpr size_t VECTOR_SIZE = 4;
static constexpr size_t MATRIX_SIZE = 16;
public:
static void Initialize(Napi::Env env)
{
Napi::HandleScope scope{env};
Napi::Function func = DefineClass(
env,
JS_CLASS_NAME,
{
InstanceAccessor("position", &XRRigidTransform::Position, nullptr),
InstanceAccessor("orientation", &XRRigidTransform::Orientation, nullptr),
InstanceAccessor("matrix", &XRRigidTransform::Matrix, nullptr),
});
env.Global().Set(JS_CLASS_NAME, func);
}
static Napi::Object New(const Napi::Env& env)
{
return env.Global().Get(JS_CLASS_NAME).As<Napi::Function>().New({});
}
XRRigidTransform(const Napi::CallbackInfo& info)
: Napi::ObjectWrap<XRRigidTransform>{info}
, m_matrix{Napi::Persistent(Napi::Float32Array::New(info.Env(), MATRIX_SIZE))}
{
if (info.Length() == 2)
{
m_position = Napi::Persistent(info[0].As<Napi::Object>());
m_orientation = Napi::Persistent(info[1].As<Napi::Object>());
}
else
{
auto position{Napi::Object::New(info.Env())};
position.Set("x", 0.f);
position.Set("y", 0.f);
position.Set("z", 0.f);
position.Set("w", 1.f);
m_position = Napi::Persistent(position);
auto orientation{Napi::Object::New(info.Env())};
orientation.Set("x", 0.f);
orientation.Set("y", 0.f);
orientation.Set("z", 0.f);
orientation.Set("w", 1.f);
m_orientation = Napi::Persistent(orientation);
}
}
void Update(XRRigidTransform* transform)
{
Update({transform->GetNativePose()}, false);