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OpenXrProgram.cpp
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OpenXrProgram.cpp
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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
#include "pch.h"
#include "OpenXrProgram.h"
#include "DxUtility.h"
namespace {
struct ImplementOpenXrProgram : sample::IOpenXrProgram {
ImplementOpenXrProgram(std::string applicationName, std::unique_ptr<sample::IGraphicsPluginD3D11> graphicsPlugin)
: m_applicationName(std::move(applicationName))
, m_graphicsPlugin(std::move(graphicsPlugin)) {
}
void Run() override {
CreateInstance();
CreateActions();
bool requestRestart = false;
do {
InitializeSystem();
InitializeSession();
while (true) {
bool exitRenderLoop = false;
ProcessEvents(&exitRenderLoop, &requestRestart);
if (exitRenderLoop) {
break;
}
if (m_sessionRunning) {
PollActions();
RenderFrame();
} else {
// Throttle loop since xrWaitFrame won't be called.
using namespace std::chrono_literals;
std::this_thread::sleep_for(250ms);
}
}
if (requestRestart) {
PrepareSessionRestart();
}
} while (requestRestart);
}
private:
void CreateInstance() {
CHECK(m_instance.Get() == XR_NULL_HANDLE);
// Build out the extensions to enable. Some extensions are required and some are optional.
const std::vector<const char*> enabledExtensions = SelectExtensions();
// Create the instance with enabled extensions.
XrInstanceCreateInfo createInfo{XR_TYPE_INSTANCE_CREATE_INFO};
createInfo.enabledExtensionCount = (uint32_t)enabledExtensions.size();
createInfo.enabledExtensionNames = enabledExtensions.data();
createInfo.applicationInfo = {"BasicXrApp", 1, "", 1, XR_CURRENT_API_VERSION};
strcpy_s(createInfo.applicationInfo.applicationName, m_applicationName.c_str());
CHECK_XRCMD(xrCreateInstance(&createInfo, m_instance.Put(xrDestroyInstance)));
xr::g_dispatchTable.Initialize(m_instance.Get(), xrGetInstanceProcAddr);
}
std::vector<const char*> SelectExtensions() {
// Fetch the list of extensions supported by the runtime.
uint32_t extensionCount;
CHECK_XRCMD(xrEnumerateInstanceExtensionProperties(nullptr, 0, &extensionCount, nullptr));
std::vector<XrExtensionProperties> extensionProperties(extensionCount, {XR_TYPE_EXTENSION_PROPERTIES});
CHECK_XRCMD(xrEnumerateInstanceExtensionProperties(nullptr, extensionCount, &extensionCount, extensionProperties.data()));
std::vector<const char*> enabledExtensions;
// Add a specific extension to the list of extensions to be enabled, if it is supported.
auto EnableExtensionIfSupported = [&](const char* extensionName) {
for (uint32_t i = 0; i < extensionCount; i++) {
if (strcmp(extensionProperties[i].extensionName, extensionName) == 0) {
enabledExtensions.push_back(extensionName);
return true;
}
}
return false;
};
// D3D11 extension is required for this sample, so check if it's supported.
CHECK(EnableExtensionIfSupported(XR_KHR_D3D11_ENABLE_EXTENSION_NAME));
#if UWP
// Require XR_EXT_win32_appcontainer_compatible extension when building in UWP context.
CHECK(EnableExtensionIfSupported(XR_EXT_WIN32_APPCONTAINER_COMPATIBLE_EXTENSION_NAME));
#endif
// Additional optional extensions for enhanced functionality. Track whether enabled in m_optionalExtensions.
m_optionalExtensions.DepthExtensionSupported = EnableExtensionIfSupported(XR_KHR_COMPOSITION_LAYER_DEPTH_EXTENSION_NAME);
m_optionalExtensions.UnboundedRefSpaceSupported = EnableExtensionIfSupported(XR_MSFT_UNBOUNDED_REFERENCE_SPACE_EXTENSION_NAME);
m_optionalExtensions.SpatialAnchorSupported = EnableExtensionIfSupported(XR_MSFT_SPATIAL_ANCHOR_EXTENSION_NAME);
m_optionalExtensions.MsftHandInteractionSupported = EnableExtensionIfSupported(XR_MSFT_HAND_INTERACTION_EXTENSION_NAME);
m_optionalExtensions.HPMRControllerSupported = EnableExtensionIfSupported(XR_EXT_HP_MIXED_REALITY_CONTROLLER_EXTENSION_NAME);
return enabledExtensions;
}
void CreateActions() {
CHECK(m_instance.Get() != XR_NULL_HANDLE);
// Create an action set.
{
XrActionSetCreateInfo actionSetInfo{XR_TYPE_ACTION_SET_CREATE_INFO};
strcpy_s(actionSetInfo.actionSetName, "place_hologram_action_set");
strcpy_s(actionSetInfo.localizedActionSetName, "Placement");
CHECK_XRCMD(xrCreateActionSet(m_instance.Get(), &actionSetInfo, m_actionSet.Put(xrDestroyActionSet)));
}
// Create actions.
{
// Enable subaction path filtering for left or right hand.
m_subactionPaths[LeftSide] = GetXrPath("/user/hand/left");
m_subactionPaths[RightSide] = GetXrPath("/user/hand/right");
// Create an input action to place a hologram.
{
XrActionCreateInfo actionInfo{XR_TYPE_ACTION_CREATE_INFO};
actionInfo.actionType = XR_ACTION_TYPE_BOOLEAN_INPUT;
strcpy_s(actionInfo.actionName, "place_hologram");
strcpy_s(actionInfo.localizedActionName, "Place Hologram");
actionInfo.countSubactionPaths = (uint32_t)m_subactionPaths.size();
actionInfo.subactionPaths = m_subactionPaths.data();
CHECK_XRCMD(xrCreateAction(m_actionSet.Get(), &actionInfo, m_placeAction.Put(xrDestroyAction)));
}
// Create an input action getting the left and right hand poses.
{
XrActionCreateInfo actionInfo{XR_TYPE_ACTION_CREATE_INFO};
actionInfo.actionType = XR_ACTION_TYPE_POSE_INPUT;
strcpy_s(actionInfo.actionName, "hand_pose");
strcpy_s(actionInfo.localizedActionName, "Hand Pose");
actionInfo.countSubactionPaths = (uint32_t)m_subactionPaths.size();
actionInfo.subactionPaths = m_subactionPaths.data();
CHECK_XRCMD(xrCreateAction(m_actionSet.Get(), &actionInfo, m_poseAction.Put(xrDestroyAction)));
}
// Create an output action for vibrating the left and right controller.
{
XrActionCreateInfo actionInfo{XR_TYPE_ACTION_CREATE_INFO};
actionInfo.actionType = XR_ACTION_TYPE_VIBRATION_OUTPUT;
strcpy_s(actionInfo.actionName, "vibrate");
strcpy_s(actionInfo.localizedActionName, "Vibrate");
actionInfo.countSubactionPaths = (uint32_t)m_subactionPaths.size();
actionInfo.subactionPaths = m_subactionPaths.data();
CHECK_XRCMD(xrCreateAction(m_actionSet.Get(), &actionInfo, m_vibrateAction.Put(xrDestroyAction)));
}
// Create an input action to exit the session.
{
XrActionCreateInfo actionInfo{XR_TYPE_ACTION_CREATE_INFO};
actionInfo.actionType = XR_ACTION_TYPE_BOOLEAN_INPUT;
strcpy_s(actionInfo.actionName, "exit_session");
strcpy_s(actionInfo.localizedActionName, "Exit session");
actionInfo.countSubactionPaths = (uint32_t)m_subactionPaths.size();
actionInfo.subactionPaths = m_subactionPaths.data();
CHECK_XRCMD(xrCreateAction(m_actionSet.Get(), &actionInfo, m_exitAction.Put(xrDestroyAction)));
}
}
// Set up suggested bindings for the simple_controller profile.
{
std::vector<XrActionSuggestedBinding> bindings;
bindings.push_back({m_placeAction.Get(), GetXrPath("/user/hand/right/input/select/click")});
bindings.push_back({m_placeAction.Get(), GetXrPath("/user/hand/left/input/select/click")});
bindings.push_back({m_poseAction.Get(), GetXrPath("/user/hand/right/input/grip/pose")});
bindings.push_back({m_poseAction.Get(), GetXrPath("/user/hand/left/input/grip/pose")});
bindings.push_back({m_vibrateAction.Get(), GetXrPath("/user/hand/right/output/haptic")});
bindings.push_back({m_vibrateAction.Get(), GetXrPath("/user/hand/left/output/haptic")});
bindings.push_back({m_exitAction.Get(), GetXrPath("/user/hand/right/input/menu/click")});
bindings.push_back({m_exitAction.Get(), GetXrPath("/user/hand/left/input/menu/click")});
XrInteractionProfileSuggestedBinding suggestedBindings{XR_TYPE_INTERACTION_PROFILE_SUGGESTED_BINDING};
suggestedBindings.interactionProfile = GetXrPath("/interaction_profiles/khr/simple_controller");
suggestedBindings.suggestedBindings = bindings.data();
suggestedBindings.countSuggestedBindings = (uint32_t)bindings.size();
CHECK_XRCMD(xrSuggestInteractionProfileBindings(m_instance.Get(), &suggestedBindings));
}
// Set up suggested bindings for the hp/mixed_reality_controller profile.
if (m_optionalExtensions.HPMRControllerSupported) {
std::vector<XrActionSuggestedBinding> bindings;
bindings.push_back({m_placeAction.Get(), GetXrPath("/user/hand/right/input/trigger/value")});
bindings.push_back({m_placeAction.Get(), GetXrPath("/user/hand/left/input/trigger/value")});
bindings.push_back({m_poseAction.Get(), GetXrPath("/user/hand/right/input/grip/pose")});
bindings.push_back({m_poseAction.Get(), GetXrPath("/user/hand/left/input/grip/pose")});
bindings.push_back({m_vibrateAction.Get(), GetXrPath("/user/hand/right/output/haptic")});
bindings.push_back({m_vibrateAction.Get(), GetXrPath("/user/hand/left/output/haptic")});
bindings.push_back({m_exitAction.Get(), GetXrPath("/user/hand/right/input/squeeze/value")});
bindings.push_back({m_exitAction.Get(), GetXrPath("/user/hand/left/input/squeeze/value")});
XrInteractionProfileSuggestedBinding suggestedBindings{XR_TYPE_INTERACTION_PROFILE_SUGGESTED_BINDING};
suggestedBindings.interactionProfile = GetXrPath("/interaction_profiles/hp/mixed_reality_controller");
suggestedBindings.suggestedBindings = bindings.data();
suggestedBindings.countSuggestedBindings = (uint32_t)bindings.size();
CHECK_XRCMD(xrSuggestInteractionProfileBindings(m_instance.Get(), &suggestedBindings));
}
// Set up suggested bindings for the microsoft/hand_interaction profile.
if (m_optionalExtensions.MsftHandInteractionSupported) {
std::vector<XrActionSuggestedBinding> bindings;
bindings.push_back({m_placeAction.Get(), GetXrPath("/user/hand/right/input/select/value")});
bindings.push_back({m_placeAction.Get(), GetXrPath("/user/hand/left/input/select/value")});
bindings.push_back({m_poseAction.Get(), GetXrPath("/user/hand/right/input/grip/pose")});
bindings.push_back({m_poseAction.Get(), GetXrPath("/user/hand/left/input/grip/pose")});
bindings.push_back({m_exitAction.Get(), GetXrPath("/user/hand/right/input/squeeze/value")});
bindings.push_back({m_exitAction.Get(), GetXrPath("/user/hand/left/input/squeeze/value")});
XrInteractionProfileSuggestedBinding suggestedBindings{XR_TYPE_INTERACTION_PROFILE_SUGGESTED_BINDING};
suggestedBindings.interactionProfile = GetXrPath("/interaction_profiles/microsoft/hand_interaction");
suggestedBindings.suggestedBindings = bindings.data();
suggestedBindings.countSuggestedBindings = (uint32_t)bindings.size();
CHECK_XRCMD(xrSuggestInteractionProfileBindings(m_instance.Get(), &suggestedBindings));
}
}
void InitializeSystem() {
CHECK(m_instance.Get() != XR_NULL_HANDLE);
CHECK(m_systemId == XR_NULL_SYSTEM_ID);
XrSystemGetInfo systemInfo{XR_TYPE_SYSTEM_GET_INFO};
systemInfo.formFactor = m_formFactor;
while (true) {
XrResult result = xrGetSystem(m_instance.Get(), &systemInfo, &m_systemId);
if (SUCCEEDED(result)) {
break;
} else if (result == XR_ERROR_FORM_FACTOR_UNAVAILABLE) {
DEBUG_PRINT("No headset detected. Trying again in one second...");
using namespace std::chrono_literals;
std::this_thread::sleep_for(1s);
} else {
CHECK_XRRESULT(result, "xrGetSystem");
}
};
// Choose an environment blend mode.
{
// Query the list of supported environment blend modes for the current system.
uint32_t count;
CHECK_XRCMD(xrEnumerateEnvironmentBlendModes(m_instance.Get(), m_systemId, m_primaryViewConfigType, 0, &count, nullptr));
CHECK(count > 0); // A system must support at least one environment blend mode.
std::vector<XrEnvironmentBlendMode> environmentBlendModes(count);
CHECK_XRCMD(xrEnumerateEnvironmentBlendModes(
m_instance.Get(), m_systemId, m_primaryViewConfigType, count, &count, environmentBlendModes.data()));
// This sample supports all modes, pick the system's preferred one.
m_environmentBlendMode = environmentBlendModes[0];
}
// Choosing a reasonable depth range can help improve hologram visual quality.
// Use reversed-Z (near > far) for more uniform Z resolution.
m_nearFar = {20.f, 0.1f};
}
void InitializeSession() {
CHECK(m_instance.Get() != XR_NULL_HANDLE);
CHECK(m_systemId != XR_NULL_SYSTEM_ID);
CHECK(m_session.Get() == XR_NULL_HANDLE);
// Create the D3D11 device for the adapter associated with the system.
XrGraphicsRequirementsD3D11KHR graphicsRequirements{XR_TYPE_GRAPHICS_REQUIREMENTS_D3D11_KHR};
CHECK_XRCMD(xrGetD3D11GraphicsRequirementsKHR(m_instance.Get(), m_systemId, &graphicsRequirements));
// Create a list of feature levels which are both supported by the OpenXR runtime and this application.
std::vector<D3D_FEATURE_LEVEL> featureLevels = {D3D_FEATURE_LEVEL_12_1,
D3D_FEATURE_LEVEL_12_0,
D3D_FEATURE_LEVEL_11_1,
D3D_FEATURE_LEVEL_11_0,
D3D_FEATURE_LEVEL_10_1,
D3D_FEATURE_LEVEL_10_0};
featureLevels.erase(std::remove_if(featureLevels.begin(),
featureLevels.end(),
[&](D3D_FEATURE_LEVEL fl) { return fl < graphicsRequirements.minFeatureLevel; }),
featureLevels.end());
CHECK_MSG(featureLevels.size() != 0, "Unsupported minimum feature level!");
ID3D11Device* device = m_graphicsPlugin->InitializeDevice(graphicsRequirements.adapterLuid, featureLevels);
XrGraphicsBindingD3D11KHR graphicsBinding{XR_TYPE_GRAPHICS_BINDING_D3D11_KHR};
graphicsBinding.device = device;
XrSessionCreateInfo createInfo{XR_TYPE_SESSION_CREATE_INFO};
createInfo.next = &graphicsBinding;
createInfo.systemId = m_systemId;
CHECK_XRCMD(xrCreateSession(m_instance.Get(), &createInfo, m_session.Put(xrDestroySession)));
XrSessionActionSetsAttachInfo attachInfo{XR_TYPE_SESSION_ACTION_SETS_ATTACH_INFO};
std::vector<XrActionSet> actionSets = {m_actionSet.Get()};
attachInfo.countActionSets = (uint32_t)actionSets.size();
attachInfo.actionSets = actionSets.data();
CHECK_XRCMD(xrAttachSessionActionSets(m_session.Get(), &attachInfo));
CreateSpaces();
CreateSwapchains();
}
void CreateSpaces() {
CHECK(m_session.Get() != XR_NULL_HANDLE);
// Create a app space to bridge interactions and all holograms.
{
if (m_optionalExtensions.UnboundedRefSpaceSupported) {
// Unbounded reference space provides the best app space for world-scale experiences.
m_appSpaceType = XR_REFERENCE_SPACE_TYPE_UNBOUNDED_MSFT;
} else {
// If running on a platform that does not support world-scale experiences, fall back to local space.
m_appSpaceType = XR_REFERENCE_SPACE_TYPE_LOCAL;
}
XrReferenceSpaceCreateInfo spaceCreateInfo{XR_TYPE_REFERENCE_SPACE_CREATE_INFO};
spaceCreateInfo.referenceSpaceType = m_appSpaceType;
spaceCreateInfo.poseInReferenceSpace = xr::math::Pose::Identity();
CHECK_XRCMD(xrCreateReferenceSpace(m_session.Get(), &spaceCreateInfo, m_appSpace.Put(xrDestroySpace)));
}
// Create a space for each hand pointer pose.
for (uint32_t side : {LeftSide, RightSide}) {
XrActionSpaceCreateInfo createInfo{XR_TYPE_ACTION_SPACE_CREATE_INFO};
createInfo.action = m_poseAction.Get();
createInfo.poseInActionSpace = xr::math::Pose::Identity();
createInfo.subactionPath = m_subactionPaths[side];
CHECK_XRCMD(xrCreateActionSpace(m_session.Get(), &createInfo, m_cubesInHand[side].Space.Put(xrDestroySpace)));
}
}
std::tuple<DXGI_FORMAT, DXGI_FORMAT> SelectSwapchainPixelFormats() {
CHECK(m_session.Get() != XR_NULL_HANDLE);
// Query the runtime's preferred swapchain formats.
uint32_t swapchainFormatCount;
CHECK_XRCMD(xrEnumerateSwapchainFormats(m_session.Get(), 0, &swapchainFormatCount, nullptr));
std::vector<int64_t> swapchainFormats(swapchainFormatCount);
CHECK_XRCMD(xrEnumerateSwapchainFormats(
m_session.Get(), (uint32_t)swapchainFormats.size(), &swapchainFormatCount, swapchainFormats.data()));
// Choose the first runtime-preferred format that this app supports.
auto SelectPixelFormat = [](const std::vector<int64_t>& runtimePreferredFormats,
const std::vector<DXGI_FORMAT>& applicationSupportedFormats) {
auto found = std::find_first_of(std::begin(runtimePreferredFormats),
std::end(runtimePreferredFormats),
std::begin(applicationSupportedFormats),
std::end(applicationSupportedFormats));
if (found == std::end(runtimePreferredFormats)) {
THROW("No runtime swapchain format is supported.");
}
return (DXGI_FORMAT)*found;
};
DXGI_FORMAT colorSwapchainFormat = SelectPixelFormat(swapchainFormats, m_graphicsPlugin->SupportedColorFormats());
DXGI_FORMAT depthSwapchainFormat = SelectPixelFormat(swapchainFormats, m_graphicsPlugin->SupportedDepthFormats());
return {colorSwapchainFormat, depthSwapchainFormat};
}
void CreateSwapchains() {
CHECK(m_session.Get() != XR_NULL_HANDLE);
CHECK(m_renderResources == nullptr);
m_renderResources = std::make_unique<RenderResources>();
// Read graphics properties for preferred swapchain length and logging.
XrSystemProperties systemProperties{XR_TYPE_SYSTEM_PROPERTIES};
CHECK_XRCMD(xrGetSystemProperties(m_instance.Get(), m_systemId, &systemProperties));
// Select color and depth swapchain pixel formats.
const auto [colorSwapchainFormat, depthSwapchainFormat] = SelectSwapchainPixelFormats();
// Query and cache view configuration views.
uint32_t viewCount;
CHECK_XRCMD(xrEnumerateViewConfigurationViews(m_instance.Get(), m_systemId, m_primaryViewConfigType, 0, &viewCount, nullptr));
CHECK(viewCount == m_stereoViewCount);
m_renderResources->ConfigViews.resize(viewCount, {XR_TYPE_VIEW_CONFIGURATION_VIEW});
CHECK_XRCMD(xrEnumerateViewConfigurationViews(
m_instance.Get(), m_systemId, m_primaryViewConfigType, viewCount, &viewCount, m_renderResources->ConfigViews.data()));
// Using texture array for better performance, so requiring left/right views have identical sizes.
const XrViewConfigurationView& view = m_renderResources->ConfigViews[0];
CHECK(m_renderResources->ConfigViews[0].recommendedImageRectWidth ==
m_renderResources->ConfigViews[1].recommendedImageRectWidth);
CHECK(m_renderResources->ConfigViews[0].recommendedImageRectHeight ==
m_renderResources->ConfigViews[1].recommendedImageRectHeight);
CHECK(m_renderResources->ConfigViews[0].recommendedSwapchainSampleCount ==
m_renderResources->ConfigViews[1].recommendedSwapchainSampleCount);
// Use the system's recommended rendering parameters.
const uint32_t imageRectWidth = view.recommendedImageRectWidth;
const uint32_t imageRectHeight = view.recommendedImageRectHeight;
const uint32_t swapchainSampleCount = view.recommendedSwapchainSampleCount;
// Create swapchains with texture array for color and depth images.
// The texture array has the size of viewCount, and they are rendered in a single pass using VPRT.
const uint32_t textureArraySize = viewCount;
m_renderResources->ColorSwapchain =
CreateSwapchainD3D11(m_session.Get(),
colorSwapchainFormat,
imageRectWidth,
imageRectHeight,
textureArraySize,
swapchainSampleCount,
0 /*createFlags*/,
XR_SWAPCHAIN_USAGE_SAMPLED_BIT | XR_SWAPCHAIN_USAGE_COLOR_ATTACHMENT_BIT);
m_renderResources->DepthSwapchain =
CreateSwapchainD3D11(m_session.Get(),
depthSwapchainFormat,
imageRectWidth,
imageRectHeight,
textureArraySize,
swapchainSampleCount,
0 /*createFlags*/,
XR_SWAPCHAIN_USAGE_SAMPLED_BIT | XR_SWAPCHAIN_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT);
// Preallocate view buffers for xrLocateViews later inside frame loop.
m_renderResources->Views.resize(viewCount, {XR_TYPE_VIEW});
}
struct SwapchainD3D11;
SwapchainD3D11 CreateSwapchainD3D11(XrSession session,
DXGI_FORMAT format,
uint32_t width,
uint32_t height,
uint32_t arraySize,
uint32_t sampleCount,
XrSwapchainCreateFlags createFlags,
XrSwapchainUsageFlags usageFlags) {
SwapchainD3D11 swapchain;
swapchain.Format = format;
swapchain.Width = width;
swapchain.Height = height;
swapchain.ArraySize = arraySize;
XrSwapchainCreateInfo swapchainCreateInfo{XR_TYPE_SWAPCHAIN_CREATE_INFO};
swapchainCreateInfo.arraySize = arraySize;
swapchainCreateInfo.format = format;
swapchainCreateInfo.width = width;
swapchainCreateInfo.height = height;
swapchainCreateInfo.mipCount = 1;
swapchainCreateInfo.faceCount = 1;
swapchainCreateInfo.sampleCount = sampleCount;
swapchainCreateInfo.createFlags = createFlags;
swapchainCreateInfo.usageFlags = usageFlags;
CHECK_XRCMD(xrCreateSwapchain(session, &swapchainCreateInfo, swapchain.Handle.Put(xrDestroySwapchain)));
uint32_t chainLength;
CHECK_XRCMD(xrEnumerateSwapchainImages(swapchain.Handle.Get(), 0, &chainLength, nullptr));
swapchain.Images.resize(chainLength, {XR_TYPE_SWAPCHAIN_IMAGE_D3D11_KHR});
CHECK_XRCMD(xrEnumerateSwapchainImages(swapchain.Handle.Get(),
(uint32_t)swapchain.Images.size(),
&chainLength,
reinterpret_cast<XrSwapchainImageBaseHeader*>(swapchain.Images.data())));
return swapchain;
}
void ProcessEvents(bool* exitRenderLoop, bool* requestRestart) {
*exitRenderLoop = *requestRestart = false;
auto pollEvent = [&](XrEventDataBuffer& eventData) -> bool {
eventData.type = XR_TYPE_EVENT_DATA_BUFFER;
eventData.next = nullptr;
return CHECK_XRCMD(xrPollEvent(m_instance.Get(), &eventData)) == XR_SUCCESS;
};
XrEventDataBuffer eventData{};
while (pollEvent(eventData)) {
switch (eventData.type) {
case XR_TYPE_EVENT_DATA_INSTANCE_LOSS_PENDING: {
*exitRenderLoop = true;
*requestRestart = false;
return;
}
case XR_TYPE_EVENT_DATA_SESSION_STATE_CHANGED: {
const auto stateEvent = *reinterpret_cast<const XrEventDataSessionStateChanged*>(&eventData);
CHECK(m_session.Get() != XR_NULL_HANDLE && m_session.Get() == stateEvent.session);
m_sessionState = stateEvent.state;
switch (m_sessionState) {
case XR_SESSION_STATE_READY: {
CHECK(m_session.Get() != XR_NULL_HANDLE);
XrSessionBeginInfo sessionBeginInfo{XR_TYPE_SESSION_BEGIN_INFO};
sessionBeginInfo.primaryViewConfigurationType = m_primaryViewConfigType;
CHECK_XRCMD(xrBeginSession(m_session.Get(), &sessionBeginInfo));
m_sessionRunning = true;
break;
}
case XR_SESSION_STATE_STOPPING: {
m_sessionRunning = false;
CHECK_XRCMD(xrEndSession(m_session.Get()));
break;
}
case XR_SESSION_STATE_EXITING: {
// Do not attempt to restart, because user closed this session.
*exitRenderLoop = true;
*requestRestart = false;
break;
}
case XR_SESSION_STATE_LOSS_PENDING: {
// Session was lost, so start over and poll for new systemId.
*exitRenderLoop = true;
*requestRestart = true;
break;
}
}
break;
}
case XR_TYPE_EVENT_DATA_REFERENCE_SPACE_CHANGE_PENDING:
case XR_TYPE_EVENT_DATA_INTERACTION_PROFILE_CHANGED:
default: {
DEBUG_PRINT("Ignoring event type %d", eventData.type);
break;
}
}
}
}
struct Hologram;
Hologram CreateHologram(const XrPosef& poseInAppSpace, XrTime placementTime) const {
Hologram hologram{};
if (m_optionalExtensions.SpatialAnchorSupported) {
// Anchors provide the best stability when moving beyond 5 meters, so if the extension is enabled,
// create an anchor at given location and place the hologram at the resulting anchor space.
XrSpatialAnchorCreateInfoMSFT createInfo{XR_TYPE_SPATIAL_ANCHOR_CREATE_INFO_MSFT};
createInfo.space = m_appSpace.Get();
createInfo.pose = poseInAppSpace;
createInfo.time = placementTime;
XrResult result = xrCreateSpatialAnchorMSFT(m_session.Get(), &createInfo, hologram.Anchor.Put(xrDestroySpatialAnchorMSFT));
if (XR_SUCCEEDED(result)) {
XrSpatialAnchorSpaceCreateInfoMSFT createSpaceInfo{XR_TYPE_SPATIAL_ANCHOR_SPACE_CREATE_INFO_MSFT};
createSpaceInfo.anchor = hologram.Anchor.Get();
createSpaceInfo.poseInAnchorSpace = xr::math::Pose::Identity();
CHECK_XRCMD(xrCreateSpatialAnchorSpaceMSFT(m_session.Get(), &createSpaceInfo, hologram.Cube.Space.Put(xrDestroySpace)));
} else if (result == XR_ERROR_CREATE_SPATIAL_ANCHOR_FAILED_MSFT) {
DEBUG_PRINT("Anchor cannot be created, likely due to lost positional tracking.");
} else {
CHECK_XRRESULT(result, "xrCreateSpatialAnchorMSFT");
}
} else {
// If the anchor extension is not available, place hologram in the app space.
// This works fine as long as user doesn't move far away from app space origin.
XrReferenceSpaceCreateInfo createInfo{XR_TYPE_REFERENCE_SPACE_CREATE_INFO};
createInfo.referenceSpaceType = m_appSpaceType;
createInfo.poseInReferenceSpace = poseInAppSpace;
CHECK_XRCMD(xrCreateReferenceSpace(m_session.Get(), &createInfo, hologram.Cube.Space.Put(xrDestroySpace)));
}
return hologram;
}
void PollActions() {
// Get updated action states.
std::vector<XrActiveActionSet> activeActionSets = {{m_actionSet.Get(), XR_NULL_PATH}};
XrActionsSyncInfo syncInfo{XR_TYPE_ACTIONS_SYNC_INFO};
syncInfo.countActiveActionSets = (uint32_t)activeActionSets.size();
syncInfo.activeActionSets = activeActionSets.data();
CHECK_XRCMD(xrSyncActions(m_session.Get(), &syncInfo));
// Check the state of the actions for left and right hands separately.
for (uint32_t side : {LeftSide, RightSide}) {
const XrPath subactionPath = m_subactionPaths[side];
// Apply a tiny vibration to the corresponding hand to indicate that action is detected.
auto ApplyVibration = [this, subactionPath] {
XrHapticActionInfo actionInfo{XR_TYPE_HAPTIC_ACTION_INFO};
actionInfo.action = m_vibrateAction.Get();
actionInfo.subactionPath = subactionPath;
XrHapticVibration vibration{XR_TYPE_HAPTIC_VIBRATION};
vibration.amplitude = 0.5f;
vibration.duration = XR_MIN_HAPTIC_DURATION;
vibration.frequency = XR_FREQUENCY_UNSPECIFIED;
CHECK_XRCMD(xrApplyHapticFeedback(m_session.Get(), &actionInfo, (XrHapticBaseHeader*)&vibration));
};
XrActionStateBoolean placeActionValue{XR_TYPE_ACTION_STATE_BOOLEAN};
{
XrActionStateGetInfo getInfo{XR_TYPE_ACTION_STATE_GET_INFO};
getInfo.action = m_placeAction.Get();
getInfo.subactionPath = subactionPath;
CHECK_XRCMD(xrGetActionStateBoolean(m_session.Get(), &getInfo, &placeActionValue));
}
// When select button is pressed, place the cube at the location of the corresponding hand.
if (placeActionValue.isActive && placeActionValue.changedSinceLastSync && placeActionValue.currentState) {
// Use the pose at the historical time when the action happened to do the placement.
const XrTime placementTime = placeActionValue.lastChangeTime;
// Locate the hand in the scene.
XrSpaceLocation handLocation{XR_TYPE_SPACE_LOCATION};
CHECK_XRCMD(xrLocateSpace(m_cubesInHand[side].Space.Get(), m_appSpace.Get(), placementTime, &handLocation));
// Ensure we have tracking before placing a cube in the scene, so that it stays reliably at a physical location.
if (!xr::math::Pose::IsPoseValid(handLocation)) {
DEBUG_PRINT("Cube cannot be placed when positional tracking is lost.");
} else {
// Place a new cube at the given location and time, and remember output placement space and anchor.
m_holograms.push_back(CreateHologram(handLocation.pose, placementTime));
}
ApplyVibration();
}
// This sample, when menu button is released, requests to quit the session, and therefore quit the application.
{
XrActionStateBoolean exitActionValue{XR_TYPE_ACTION_STATE_BOOLEAN};
XrActionStateGetInfo getInfo{XR_TYPE_ACTION_STATE_GET_INFO};
getInfo.action = m_exitAction.Get();
getInfo.subactionPath = subactionPath;
CHECK_XRCMD(xrGetActionStateBoolean(m_session.Get(), &getInfo, &exitActionValue));
if (exitActionValue.isActive && exitActionValue.changedSinceLastSync && !exitActionValue.currentState) {
CHECK_XRCMD(xrRequestExitSession(m_session.Get()));
ApplyVibration();
}
}
}
}
void RenderFrame() {
CHECK(m_session.Get() != XR_NULL_HANDLE);
XrFrameWaitInfo frameWaitInfo{XR_TYPE_FRAME_WAIT_INFO};
XrFrameState frameState{XR_TYPE_FRAME_STATE};
CHECK_XRCMD(xrWaitFrame(m_session.Get(), &frameWaitInfo, &frameState));
XrFrameBeginInfo frameBeginInfo{XR_TYPE_FRAME_BEGIN_INFO};
CHECK_XRCMD(xrBeginFrame(m_session.Get(), &frameBeginInfo));
// xrEndFrame can submit multiple layers. This sample submits one.
std::vector<XrCompositionLayerBaseHeader*> layers;
// The projection layer consists of projection layer views.
XrCompositionLayerProjection layer{XR_TYPE_COMPOSITION_LAYER_PROJECTION};
// Inform the runtime that the app's submitted alpha channel has valid data for use during composition.
// The primary display on HoloLens has an additive environment blend mode. It will ignore the alpha channel.
// However, mixed reality capture uses the alpha channel if this bit is set to blend content with the environment.
layer.layerFlags = XR_COMPOSITION_LAYER_BLEND_TEXTURE_SOURCE_ALPHA_BIT;
// Only render when session is visible, otherwise submit zero layers.
if (frameState.shouldRender) {
// First update the viewState and views using latest predicted display time.
{
XrViewLocateInfo viewLocateInfo{XR_TYPE_VIEW_LOCATE_INFO};
viewLocateInfo.viewConfigurationType = m_primaryViewConfigType;
viewLocateInfo.displayTime = frameState.predictedDisplayTime;
viewLocateInfo.space = m_appSpace.Get();
// The output view count of xrLocateViews is always same as xrEnumerateViewConfigurationViews.
// Therefore, Views can be preallocated and avoid two call idiom here.
uint32_t viewCapacityInput = (uint32_t)m_renderResources->Views.size();
uint32_t viewCountOutput;
CHECK_XRCMD(xrLocateViews(m_session.Get(),
&viewLocateInfo,
&m_renderResources->ViewState,
viewCapacityInput,
&viewCountOutput,
m_renderResources->Views.data()));
CHECK(viewCountOutput == viewCapacityInput);
CHECK(viewCountOutput == m_renderResources->ConfigViews.size());
CHECK(viewCountOutput == m_renderResources->ColorSwapchain.ArraySize);
CHECK(viewCountOutput == m_renderResources->DepthSwapchain.ArraySize);
}
// Then, render projection layer into each view.
if (RenderLayer(frameState.predictedDisplayTime, layer)) {
layers.push_back(reinterpret_cast<XrCompositionLayerBaseHeader*>(&layer));
}
}
// Submit the composition layers for the predicted display time.
XrFrameEndInfo frameEndInfo{XR_TYPE_FRAME_END_INFO};
frameEndInfo.displayTime = frameState.predictedDisplayTime;
frameEndInfo.environmentBlendMode = m_environmentBlendMode;
frameEndInfo.layerCount = (uint32_t)layers.size();
frameEndInfo.layers = layers.data();
CHECK_XRCMD(xrEndFrame(m_session.Get(), &frameEndInfo));
}
uint32_t AcquireAndWaitForSwapchainImage(XrSwapchain handle) {
uint32_t swapchainImageIndex;
XrSwapchainImageAcquireInfo acquireInfo{XR_TYPE_SWAPCHAIN_IMAGE_ACQUIRE_INFO};
CHECK_XRCMD(xrAcquireSwapchainImage(handle, &acquireInfo, &swapchainImageIndex));
XrSwapchainImageWaitInfo waitInfo{XR_TYPE_SWAPCHAIN_IMAGE_WAIT_INFO};
waitInfo.timeout = XR_INFINITE_DURATION;
CHECK_XRCMD(xrWaitSwapchainImage(handle, &waitInfo));
return swapchainImageIndex;
}
void InitializeSpinningCube(XrTime predictedDisplayTime) {
auto createReferenceSpace = [session = m_session.Get()](XrReferenceSpaceType referenceSpaceType, XrPosef poseInReferenceSpace) {
xr::SpaceHandle space;
XrReferenceSpaceCreateInfo createInfo{XR_TYPE_REFERENCE_SPACE_CREATE_INFO};
createInfo.referenceSpaceType = referenceSpaceType;
createInfo.poseInReferenceSpace = poseInReferenceSpace;
CHECK_XRCMD(xrCreateReferenceSpace(session, &createInfo, space.Put(xrDestroySpace)));
return space;
};
{
// Initialize a big cube 1 meter in front of user.
Hologram hologram{};
hologram.Cube.Scale = {0.25f, 0.25f, 0.25f};
hologram.Cube.Space = createReferenceSpace(XR_REFERENCE_SPACE_TYPE_LOCAL, xr::math::Pose::Translation({0, 0, -1}));
m_holograms.push_back(std::move(hologram));
m_mainCubeIndex = (uint32_t)m_holograms.size() - 1;
}
{
// Initialize a small cube and remember the time when animation is started.
Hologram hologram{};
hologram.Cube.Scale = {0.1f, 0.1f, 0.1f};
hologram.Cube.Space = createReferenceSpace(XR_REFERENCE_SPACE_TYPE_LOCAL, xr::math::Pose::Translation({0, 0, -1}));
m_holograms.push_back(std::move(hologram));
m_spinningCubeIndex = (uint32_t)m_holograms.size() - 1;
m_spinningCubeStartTime = predictedDisplayTime;
}
}
void UpdateSpinningCube(XrTime predictedDisplayTime) {
if (!m_mainCubeIndex || !m_spinningCubeIndex) {
// Deferred initialization of spinning cubes so they appear at right place for the first frame.
InitializeSpinningCube(predictedDisplayTime);
}
// Pause spinning cube animation when app loses 3D focus
if (IsSessionFocused()) {
auto convertToSeconds = [](XrDuration nanoSeconds) {
using namespace std::chrono;
return duration_cast<duration<float>>(duration<XrDuration, std::nano>(nanoSeconds)).count();
};
const XrDuration duration = predictedDisplayTime - m_spinningCubeStartTime;
const float seconds = convertToSeconds(duration);
const float angle = DirectX::XM_PIDIV2 * seconds; // Rotate 90 degrees per second
const float radius = 0.5f; // Rotation radius in meters
// Let spinning cube rotate around the main cube's y axis.
XrPosef pose;
pose.position = {radius * std::sin(angle), 0, radius * std::cos(angle)};
pose.orientation = xr::math::Quaternion::RotationAxisAngle({0, 1, 0}, angle);
m_holograms[m_spinningCubeIndex.value()].Cube.PoseInSpace = pose;
}
}
bool RenderLayer(XrTime predictedDisplayTime, XrCompositionLayerProjection& layer) {
const uint32_t viewCount = (uint32_t)m_renderResources->ConfigViews.size();
if (!xr::math::Pose::IsPoseValid(m_renderResources->ViewState)) {
DEBUG_PRINT("xrLocateViews returned an invalid pose.");
return false; // Skip rendering layers if view location is invalid
}
std::vector<const sample::Cube*> visibleCubes;
auto UpdateVisibleCube = [&](sample::Cube& cube) {
if (cube.Space.Get() != XR_NULL_HANDLE) {
XrSpaceLocation cubeSpaceInAppSpace{XR_TYPE_SPACE_LOCATION};
CHECK_XRCMD(xrLocateSpace(cube.Space.Get(), m_appSpace.Get(), predictedDisplayTime, &cubeSpaceInAppSpace));
// Update cube's location with latest space location
if (xr::math::Pose::IsPoseValid(cubeSpaceInAppSpace)) {
if (cube.PoseInSpace.has_value()) {
cube.PoseInAppSpace = xr::math::Pose::Multiply(cube.PoseInSpace.value(), cubeSpaceInAppSpace.pose);
} else {
cube.PoseInAppSpace = cubeSpaceInAppSpace.pose;
}
visibleCubes.push_back(&cube);
}
}
};
UpdateSpinningCube(predictedDisplayTime);
UpdateVisibleCube(m_cubesInHand[LeftSide]);
UpdateVisibleCube(m_cubesInHand[RightSide]);
for (auto& hologram : m_holograms) {
UpdateVisibleCube(hologram.Cube);
}
m_renderResources->ProjectionLayerViews.resize(viewCount);
if (m_optionalExtensions.DepthExtensionSupported) {
m_renderResources->DepthInfoViews.resize(viewCount);
}
// Swapchain is acquired, rendered to, and released together for all views as texture array
const SwapchainD3D11& colorSwapchain = m_renderResources->ColorSwapchain;
const SwapchainD3D11& depthSwapchain = m_renderResources->DepthSwapchain;
// Use the full size of the allocated swapchain image (could render smaller some frames to hit framerate)
const XrRect2Di imageRect = {{0, 0}, {(int32_t)colorSwapchain.Width, (int32_t)colorSwapchain.Height}};
CHECK(colorSwapchain.Width == depthSwapchain.Width);
CHECK(colorSwapchain.Height == depthSwapchain.Height);
const uint32_t colorSwapchainImageIndex = AcquireAndWaitForSwapchainImage(colorSwapchain.Handle.Get());
const uint32_t depthSwapchainImageIndex = AcquireAndWaitForSwapchainImage(depthSwapchain.Handle.Get());
// Prepare rendering parameters of each view for swapchain texture arrays
std::vector<xr::math::ViewProjection> viewProjections(viewCount);
for (uint32_t i = 0; i < viewCount; i++) {
viewProjections[i] = {m_renderResources->Views[i].pose, m_renderResources->Views[i].fov, m_nearFar};
m_renderResources->ProjectionLayerViews[i] = {XR_TYPE_COMPOSITION_LAYER_PROJECTION_VIEW};
m_renderResources->ProjectionLayerViews[i].pose = m_renderResources->Views[i].pose;
m_renderResources->ProjectionLayerViews[i].fov = m_renderResources->Views[i].fov;
m_renderResources->ProjectionLayerViews[i].subImage.swapchain = colorSwapchain.Handle.Get();
m_renderResources->ProjectionLayerViews[i].subImage.imageRect = imageRect;
m_renderResources->ProjectionLayerViews[i].subImage.imageArrayIndex = i;
if (m_optionalExtensions.DepthExtensionSupported) {
m_renderResources->DepthInfoViews[i] = {XR_TYPE_COMPOSITION_LAYER_DEPTH_INFO_KHR};
m_renderResources->DepthInfoViews[i].minDepth = 0;
m_renderResources->DepthInfoViews[i].maxDepth = 1;
m_renderResources->DepthInfoViews[i].nearZ = m_nearFar.Near;
m_renderResources->DepthInfoViews[i].farZ = m_nearFar.Far;
m_renderResources->DepthInfoViews[i].subImage.swapchain = depthSwapchain.Handle.Get();
m_renderResources->DepthInfoViews[i].subImage.imageRect = imageRect;
m_renderResources->DepthInfoViews[i].subImage.imageArrayIndex = i;
// Chain depth info struct to the corresponding projection layer view's next pointer
m_renderResources->ProjectionLayerViews[i].next = &m_renderResources->DepthInfoViews[i];
}
}
// For HoloLens additive display, best to clear render target with transparent black color (0,0,0,0)
constexpr DirectX::XMVECTORF32 opaqueColor = {0.184313729f, 0.309803933f, 0.309803933f, 1.000000000f};
constexpr DirectX::XMVECTORF32 transparent = {0.000000000f, 0.000000000f, 0.000000000f, 0.000000000f};
const DirectX::XMVECTORF32 renderTargetClearColor =
(m_environmentBlendMode == XR_ENVIRONMENT_BLEND_MODE_OPAQUE) ? opaqueColor : transparent;
m_graphicsPlugin->RenderView(imageRect,
renderTargetClearColor,
viewProjections,
colorSwapchain.Format,
colorSwapchain.Images[colorSwapchainImageIndex].texture,
depthSwapchain.Format,
depthSwapchain.Images[depthSwapchainImageIndex].texture,
visibleCubes);
XrSwapchainImageReleaseInfo releaseInfo{XR_TYPE_SWAPCHAIN_IMAGE_RELEASE_INFO};
CHECK_XRCMD(xrReleaseSwapchainImage(colorSwapchain.Handle.Get(), &releaseInfo));
CHECK_XRCMD(xrReleaseSwapchainImage(depthSwapchain.Handle.Get(), &releaseInfo));
layer.space = m_appSpace.Get();
layer.viewCount = (uint32_t)m_renderResources->ProjectionLayerViews.size();
layer.views = m_renderResources->ProjectionLayerViews.data();
return true;
}
void PrepareSessionRestart() {
m_mainCubeIndex = m_spinningCubeIndex = {};
m_holograms.clear();
m_renderResources.reset();
m_session.Reset();
m_systemId = XR_NULL_SYSTEM_ID;
}
constexpr bool IsSessionFocused() const {
return m_sessionState == XR_SESSION_STATE_FOCUSED;
}
XrPath GetXrPath(const char* string) const {
return xr::StringToPath(m_instance.Get(), string);
}
private:
constexpr static XrFormFactor m_formFactor{XR_FORM_FACTOR_HEAD_MOUNTED_DISPLAY};
constexpr static XrViewConfigurationType m_primaryViewConfigType{XR_VIEW_CONFIGURATION_TYPE_PRIMARY_STEREO};
constexpr static uint32_t m_stereoViewCount = 2; // PRIMARY_STEREO view configuration always has 2 views
const std::string m_applicationName;
const std::unique_ptr<sample::IGraphicsPluginD3D11> m_graphicsPlugin;
xr::InstanceHandle m_instance;
xr::SessionHandle m_session;
uint64_t m_systemId{XR_NULL_SYSTEM_ID};
struct {
bool DepthExtensionSupported{false};
bool UnboundedRefSpaceSupported{false};
bool SpatialAnchorSupported{false};
bool MsftHandInteractionSupported{false};
bool HPMRControllerSupported{false};
} m_optionalExtensions;
xr::SpaceHandle m_appSpace;
XrReferenceSpaceType m_appSpaceType{};
struct Hologram {
sample::Cube Cube;
xr::SpatialAnchorHandle Anchor;
};
std::vector<Hologram> m_holograms;
std::optional<uint32_t> m_mainCubeIndex;
std::optional<uint32_t> m_spinningCubeIndex;
XrTime m_spinningCubeStartTime;
constexpr static uint32_t LeftSide = 0;
constexpr static uint32_t RightSide = 1;
std::array<XrPath, 2> m_subactionPaths{};
std::array<sample::Cube, 2> m_cubesInHand{};
xr::ActionSetHandle m_actionSet;
xr::ActionHandle m_placeAction;
xr::ActionHandle m_exitAction;
xr::ActionHandle m_poseAction;
xr::ActionHandle m_vibrateAction;
XrEnvironmentBlendMode m_environmentBlendMode{};
xr::math::NearFar m_nearFar{};
struct SwapchainD3D11 {
xr::SwapchainHandle Handle;
DXGI_FORMAT Format{DXGI_FORMAT_UNKNOWN};
uint32_t Width{0};
uint32_t Height{0};
uint32_t ArraySize{0};
std::vector<XrSwapchainImageD3D11KHR> Images;
};
struct RenderResources {
XrViewState ViewState{XR_TYPE_VIEW_STATE};
std::vector<XrView> Views;
std::vector<XrViewConfigurationView> ConfigViews;
SwapchainD3D11 ColorSwapchain;
SwapchainD3D11 DepthSwapchain;
std::vector<XrCompositionLayerProjectionView> ProjectionLayerViews;
std::vector<XrCompositionLayerDepthInfoKHR> DepthInfoViews;
};
std::unique_ptr<RenderResources> m_renderResources{};
bool m_sessionRunning{false};
XrSessionState m_sessionState{XR_SESSION_STATE_UNKNOWN};
};
} // namespace
namespace sample {
std::unique_ptr<sample::IOpenXrProgram> CreateOpenXrProgram(std::string applicationName,
std::unique_ptr<sample::IGraphicsPluginD3D11> graphicsPlugin) {
return std::make_unique<ImplementOpenXrProgram>(std::move(applicationName), std::move(graphicsPlugin));
}
} // namespace sample