/**************************************************************************/ /* openxr_api.h */ /**************************************************************************/ /* This file is part of: */ /* GODOT ENGINE */ /* https://godotengine.org */ /**************************************************************************/ /* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */ /* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */ /* */ /* Permission is hereby granted, free of charge, to any person obtaining */ /* a copy of this software and associated documentation files (the */ /* "Software"), to deal in the Software without restriction, including */ /* without limitation the rights to use, copy, modify, merge, publish, */ /* distribute, sublicense, and/or sell copies of the Software, and to */ /* permit persons to whom the Software is furnished to do so, subject to */ /* the following conditions: */ /* */ /* The above copyright notice and this permission notice shall be */ /* included in all copies or substantial portions of the Software. */ /* */ /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */ /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /**************************************************************************/ #ifndef OPENXR_API_H #define OPENXR_API_H #include "core/error/error_macros.h" #include "core/math/projection.h" #include "core/math/transform_3d.h" #include "core/math/vector2.h" #include "core/os/memory.h" #include "core/string/print_string.h" #include "core/string/ustring.h" #include "core/templates/rb_map.h" #include "core/templates/rid_owner.h" #include "core/templates/vector.h" #include "servers/xr/xr_pose.h" #include "thirdparty/openxr/src/common/xr_linear.h" #include <openxr/openxr.h> #include "action_map/openxr_action.h" #include "extensions/openxr_composition_layer_provider.h" #include "extensions/openxr_extension_wrapper.h" #include "util.h" // Note, OpenXR code that we wrote for our plugin makes use of C++20 notation for initializing structs which ensures zeroing out unspecified members. // Godot is currently restricted to C++17 which doesn't allow this notation. Make sure critical fields are set. // forward declarations, we don't want to include these fully class OpenXRVulkanExtension; class OpenXRInterface; class OpenXRAPI { private: // our singleton static OpenXRAPI *singleton; // Registered extension wrappers static Vector<OpenXRExtensionWrapper *> registered_extension_wrappers; // linked XR interface OpenXRInterface *xr_interface = nullptr; // layers uint32_t num_layer_properties = 0; XrApiLayerProperties *layer_properties = nullptr; // extensions uint32_t num_supported_extensions = 0; XrExtensionProperties *supported_extensions = nullptr; Vector<CharString> enabled_extensions; // composition layer providers Vector<OpenXRCompositionLayerProvider *> composition_layer_providers; // view configuration uint32_t num_view_configuration_types = 0; XrViewConfigurationType *supported_view_configuration_types = nullptr; // reference spaces uint32_t num_reference_spaces = 0; XrReferenceSpaceType *supported_reference_spaces = nullptr; // swapchains (note these are platform dependent) uint32_t num_swapchain_formats = 0; int64_t *supported_swapchain_formats = nullptr; // system info String runtime_name; String runtime_version; // configuration XrFormFactor form_factor = XR_FORM_FACTOR_HEAD_MOUNTED_DISPLAY; XrViewConfigurationType view_configuration = XR_VIEW_CONFIGURATION_TYPE_PRIMARY_STEREO; XrReferenceSpaceType reference_space = XR_REFERENCE_SPACE_TYPE_STAGE; bool submit_depth_buffer = false; // if set to true we submit depth buffers to OpenXR if a suitable extension is enabled. // blend mode XrEnvironmentBlendMode environment_blend_mode = XR_ENVIRONMENT_BLEND_MODE_OPAQUE; uint32_t num_supported_environment_blend_modes = 0; XrEnvironmentBlendMode *supported_environment_blend_modes = nullptr; // state XrInstance instance = XR_NULL_HANDLE; XrSystemId system_id = 0; String system_name; uint32_t vendor_id = 0; XrSystemTrackingProperties tracking_properties; XrSession session = XR_NULL_HANDLE; XrSessionState session_state = XR_SESSION_STATE_UNKNOWN; bool running = false; XrFrameState frame_state = { XR_TYPE_FRAME_STATE, NULL, 0, 0, false }; double render_target_size_multiplier = 1.0; OpenXRGraphicsExtensionWrapper *graphics_extension = nullptr; XrSystemGraphicsProperties graphics_properties; uint32_t view_count = 0; XrViewConfigurationView *view_configuration_views = nullptr; XrView *views = nullptr; XrCompositionLayerProjectionView *projection_views = nullptr; XrCompositionLayerDepthInfoKHR *depth_views = nullptr; // Only used by Composition Layer Depth Extension if available enum OpenXRSwapChainTypes { OPENXR_SWAPCHAIN_COLOR, OPENXR_SWAPCHAIN_DEPTH, // OPENXR_SWAPCHAIN_VELOCITY, OPENXR_SWAPCHAIN_MAX }; struct OpenXRSwapChainInfo { XrSwapchain swapchain = XR_NULL_HANDLE; void *swapchain_graphics_data = nullptr; uint32_t image_index = 0; bool image_acquired = false; }; OpenXRSwapChainInfo swapchains[OPENXR_SWAPCHAIN_MAX]; XrSpace play_space = XR_NULL_HANDLE; XrSpace view_space = XR_NULL_HANDLE; bool view_pose_valid = false; XRPose::TrackingConfidence head_pose_confidence = XRPose::XR_TRACKING_CONFIDENCE_NONE; bool load_layer_properties(); bool load_supported_extensions(); bool is_extension_supported(const String &p_extension) const; bool is_extension_enabled(const String &p_extension) const; bool openxr_loader_init(); bool resolve_instance_openxr_symbols(); #ifdef ANDROID_ENABLED // On Android we keep tracker of our external OpenXR loader void *openxr_loader_library_handle = nullptr; #endif // function pointers #ifdef ANDROID_ENABLED // On non-Android platforms we use the OpenXR symbol linked into the engine binary. PFN_xrGetInstanceProcAddr xrGetInstanceProcAddr = nullptr; #endif EXT_PROTO_XRRESULT_FUNC3(xrAcquireSwapchainImage, (XrSwapchain), swapchain, (const XrSwapchainImageAcquireInfo *), acquireInfo, (uint32_t *), index) EXT_PROTO_XRRESULT_FUNC3(xrApplyHapticFeedback, (XrSession), session, (const XrHapticActionInfo *), hapticActionInfo, (const XrHapticBaseHeader *), hapticFeedback) EXT_PROTO_XRRESULT_FUNC2(xrAttachSessionActionSets, (XrSession), session, (const XrSessionActionSetsAttachInfo *), attachInfo) EXT_PROTO_XRRESULT_FUNC2(xrBeginFrame, (XrSession), session, (const XrFrameBeginInfo *), frameBeginInfo) EXT_PROTO_XRRESULT_FUNC2(xrBeginSession, (XrSession), session, (const XrSessionBeginInfo *), beginInfo) EXT_PROTO_XRRESULT_FUNC3(xrCreateAction, (XrActionSet), actionSet, (const XrActionCreateInfo *), createInfo, (XrAction *), action) EXT_PROTO_XRRESULT_FUNC3(xrCreateActionSet, (XrInstance), instance, (const XrActionSetCreateInfo *), createInfo, (XrActionSet *), actionSet) EXT_PROTO_XRRESULT_FUNC3(xrCreateActionSpace, (XrSession), session, (const XrActionSpaceCreateInfo *), createInfo, (XrSpace *), space) EXT_PROTO_XRRESULT_FUNC2(xrCreateInstance, (const XrInstanceCreateInfo *), createInfo, (XrInstance *), instance) EXT_PROTO_XRRESULT_FUNC3(xrCreateReferenceSpace, (XrSession), session, (const XrReferenceSpaceCreateInfo *), createInfo, (XrSpace *), space) EXT_PROTO_XRRESULT_FUNC3(xrCreateSession, (XrInstance), instance, (const XrSessionCreateInfo *), createInfo, (XrSession *), session) EXT_PROTO_XRRESULT_FUNC3(xrCreateSwapchain, (XrSession), session, (const XrSwapchainCreateInfo *), createInfo, (XrSwapchain *), swapchain) EXT_PROTO_XRRESULT_FUNC1(xrDestroyAction, (XrAction), action) EXT_PROTO_XRRESULT_FUNC1(xrDestroyActionSet, (XrActionSet), actionSet) EXT_PROTO_XRRESULT_FUNC1(xrDestroyInstance, (XrInstance), instance) EXT_PROTO_XRRESULT_FUNC1(xrDestroySession, (XrSession), session) EXT_PROTO_XRRESULT_FUNC1(xrDestroySpace, (XrSpace), space) EXT_PROTO_XRRESULT_FUNC1(xrDestroySwapchain, (XrSwapchain), swapchain) EXT_PROTO_XRRESULT_FUNC2(xrEndFrame, (XrSession), session, (const XrFrameEndInfo *), frameEndInfo) EXT_PROTO_XRRESULT_FUNC1(xrEndSession, (XrSession), session) EXT_PROTO_XRRESULT_FUNC3(xrEnumerateApiLayerProperties, (uint32_t), propertyCapacityInput, (uint32_t *), propertyCountOutput, (XrApiLayerProperties *), properties) EXT_PROTO_XRRESULT_FUNC6(xrEnumerateEnvironmentBlendModes, (XrInstance), instance, (XrSystemId), systemId, (XrViewConfigurationType), viewConfigurationType, (uint32_t), environmentBlendModeCapacityInput, (uint32_t *), environmentBlendModeCountOutput, (XrEnvironmentBlendMode *), environmentBlendModes) EXT_PROTO_XRRESULT_FUNC4(xrEnumerateInstanceExtensionProperties, (const char *), layerName, (uint32_t), propertyCapacityInput, (uint32_t *), propertyCountOutput, (XrExtensionProperties *), properties) EXT_PROTO_XRRESULT_FUNC4(xrEnumerateReferenceSpaces, (XrSession), session, (uint32_t), spaceCapacityInput, (uint32_t *), spaceCountOutput, (XrReferenceSpaceType *), spaces) EXT_PROTO_XRRESULT_FUNC4(xrEnumerateSwapchainFormats, (XrSession), session, (uint32_t), formatCapacityInput, (uint32_t *), formatCountOutput, (int64_t *), formats) EXT_PROTO_XRRESULT_FUNC5(xrEnumerateViewConfigurations, (XrInstance), instance, (XrSystemId), systemId, (uint32_t), viewConfigurationTypeCapacityInput, (uint32_t *), viewConfigurationTypeCountOutput, (XrViewConfigurationType *), viewConfigurationTypes) EXT_PROTO_XRRESULT_FUNC6(xrEnumerateViewConfigurationViews, (XrInstance), instance, (XrSystemId), systemId, (XrViewConfigurationType), viewConfigurationType, (uint32_t), viewCapacityInput, (uint32_t *), viewCountOutput, (XrViewConfigurationView *), views) EXT_PROTO_XRRESULT_FUNC3(xrGetActionStateBoolean, (XrSession), session, (const XrActionStateGetInfo *), getInfo, (XrActionStateBoolean *), state) EXT_PROTO_XRRESULT_FUNC3(xrGetActionStateFloat, (XrSession), session, (const XrActionStateGetInfo *), getInfo, (XrActionStateFloat *), state) EXT_PROTO_XRRESULT_FUNC3(xrGetActionStateVector2f, (XrSession), session, (const XrActionStateGetInfo *), getInfo, (XrActionStateVector2f *), state) EXT_PROTO_XRRESULT_FUNC3(xrGetCurrentInteractionProfile, (XrSession), session, (XrPath), topLevelUserPath, (XrInteractionProfileState *), interactionProfile) EXT_PROTO_XRRESULT_FUNC2(xrGetInstanceProperties, (XrInstance), instance, (XrInstanceProperties *), instanceProperties) EXT_PROTO_XRRESULT_FUNC3(xrGetSystem, (XrInstance), instance, (const XrSystemGetInfo *), getInfo, (XrSystemId *), systemId) EXT_PROTO_XRRESULT_FUNC3(xrGetSystemProperties, (XrInstance), instance, (XrSystemId), systemId, (XrSystemProperties *), properties) EXT_PROTO_XRRESULT_FUNC4(xrLocateSpace, (XrSpace), space, (XrSpace), baseSpace, (XrTime), time, (XrSpaceLocation *), location) EXT_PROTO_XRRESULT_FUNC6(xrLocateViews, (XrSession), session, (const XrViewLocateInfo *), viewLocateInfo, (XrViewState *), viewState, (uint32_t), viewCapacityInput, (uint32_t *), viewCountOutput, (XrView *), views) EXT_PROTO_XRRESULT_FUNC5(xrPathToString, (XrInstance), instance, (XrPath), path, (uint32_t), bufferCapacityInput, (uint32_t *), bufferCountOutput, (char *), buffer) EXT_PROTO_XRRESULT_FUNC2(xrPollEvent, (XrInstance), instance, (XrEventDataBuffer *), eventData) EXT_PROTO_XRRESULT_FUNC2(xrReleaseSwapchainImage, (XrSwapchain), swapchain, (const XrSwapchainImageReleaseInfo *), releaseInfo) EXT_PROTO_XRRESULT_FUNC3(xrResultToString, (XrInstance), instance, (XrResult), value, (char *), buffer) EXT_PROTO_XRRESULT_FUNC3(xrStringToPath, (XrInstance), instance, (const char *), pathString, (XrPath *), path) EXT_PROTO_XRRESULT_FUNC2(xrSuggestInteractionProfileBindings, (XrInstance), instance, (const XrInteractionProfileSuggestedBinding *), suggestedBindings) EXT_PROTO_XRRESULT_FUNC2(xrSyncActions, (XrSession), session, (const XrActionsSyncInfo *), syncInfo) EXT_PROTO_XRRESULT_FUNC3(xrWaitFrame, (XrSession), session, (const XrFrameWaitInfo *), frameWaitInfo, (XrFrameState *), frameState) EXT_PROTO_XRRESULT_FUNC2(xrWaitSwapchainImage, (XrSwapchain), swapchain, (const XrSwapchainImageWaitInfo *), waitInfo) // instance bool create_instance(); bool get_system_info(); bool load_supported_view_configuration_types(); bool load_supported_environmental_blend_modes(); bool is_view_configuration_supported(XrViewConfigurationType p_configuration_type) const; bool load_supported_view_configuration_views(XrViewConfigurationType p_configuration_type); void destroy_instance(); // session bool create_session(); bool load_supported_reference_spaces(); bool is_reference_space_supported(XrReferenceSpaceType p_reference_space); bool setup_spaces(); bool load_supported_swapchain_formats(); bool is_swapchain_format_supported(int64_t p_swapchain_format); bool create_swapchains(); void destroy_session(); // swapchains bool create_swapchain(XrSwapchainUsageFlags p_usage_flags, int64_t p_swapchain_format, uint32_t p_width, uint32_t p_height, uint32_t p_sample_count, uint32_t p_array_size, XrSwapchain &r_swapchain, void **r_swapchain_graphics_data); bool acquire_image(OpenXRSwapChainInfo &p_swapchain); bool release_image(OpenXRSwapChainInfo &p_swapchain); // action map struct Tracker { // Trackers represent tracked physical objects such as controllers, pucks, etc. String name; // Name for this tracker (i.e. "/user/hand/left") XrPath toplevel_path; // OpenXR XrPath for this tracker RID active_profile_rid; // RID of the active profile for this tracker }; RID_Owner<Tracker, true> tracker_owner; RID get_tracker_rid(XrPath p_path); struct ActionSet { // Action sets define a set of actions that can be enabled together String name; // Name for this action set (i.e. "godot_action_set") bool is_attached; // If true our action set has been attached to the session and can no longer be modified XrActionSet handle; // OpenXR handle for this action set }; RID_Owner<ActionSet, true> action_set_owner; struct ActionTracker { // Links and action to a tracker RID tracker_rid; // RID of the tracker XrSpace space; // Optional space for pose actions bool was_location_valid; // If true the last position we obtained was valid }; struct Action { // Actions define the inputs and outputs in OpenXR RID action_set_rid; // RID of the action set this action belongs to String name; // Name for this action (i.e. "aim_pose") XrActionType action_type; // Type of action (bool, float, etc.) Vector<ActionTracker> trackers; // The trackers this action can be used with XrAction handle; // OpenXR handle for this action }; RID_Owner<Action, true> action_owner; RID get_action_rid(XrAction p_action); struct InteractionProfile { // Interaction profiles define suggested bindings between the physical inputs on controller types and our actions String name; // Name of the interaction profile (i.e. "/interaction_profiles/valve/index_controller") XrPath path; // OpenXR path for this profile Vector<XrActionSuggestedBinding> bindings; // OpenXR action bindings }; RID_Owner<InteractionProfile, true> interaction_profile_owner; RID get_interaction_profile_rid(XrPath p_path); XrPath get_interaction_profile_path(RID p_interaction_profile); // state changes bool poll_events(); bool on_state_idle(); bool on_state_ready(); bool on_state_synchronized(); bool on_state_visible(); bool on_state_focused(); bool on_state_stopping(); bool on_state_loss_pending(); bool on_state_exiting(); // convencience void copy_string_to_char_buffer(const String p_string, char *p_buffer, int p_buffer_len); public: XrInstance get_instance() const { return instance; }; XrSystemId get_system_id() const { return system_id; }; XrSession get_session() const { return session; }; String get_runtime_name() const { return runtime_name; }; String get_runtime_version() const { return runtime_version; }; // helper method to convert an XrPosef to a Transform3D Transform3D transform_from_pose(const XrPosef &p_pose); // helper method to get a valid Transform3D from an openxr space location XRPose::TrackingConfidence transform_from_location(const XrSpaceLocation &p_location, Transform3D &r_transform); XRPose::TrackingConfidence transform_from_location(const XrHandJointLocationEXT &p_location, Transform3D &r_transform); void parse_velocities(const XrSpaceVelocity &p_velocity, Vector3 &r_linear_velocity, Vector3 &r_angular_velocity); bool xr_result(XrResult result, const char *format, Array args = Array()) const; bool is_top_level_path_supported(const String &p_toplevel_path); bool is_interaction_profile_supported(const String &p_ip_path); bool interaction_profile_supports_io_path(const String &p_ip_path, const String &p_io_path); static bool openxr_is_enabled(bool p_check_run_in_editor = true); _FORCE_INLINE_ static OpenXRAPI *get_singleton() { return singleton; } XrResult try_get_instance_proc_addr(const char *p_name, PFN_xrVoidFunction *p_addr); XrResult get_instance_proc_addr(const char *p_name, PFN_xrVoidFunction *p_addr); String get_error_string(XrResult result); String get_swapchain_format_name(int64_t p_swapchain_format) const; void set_xr_interface(OpenXRInterface *p_xr_interface); static void register_extension_wrapper(OpenXRExtensionWrapper *p_extension_wrapper); static void unregister_extension_wrapper(OpenXRExtensionWrapper *p_extension_wrapper); static void register_extension_metadata(); static void cleanup_extension_wrappers(); void set_form_factor(XrFormFactor p_form_factor); XrFormFactor get_form_factor() const { return form_factor; } void set_view_configuration(XrViewConfigurationType p_view_configuration); XrViewConfigurationType get_view_configuration() const { return view_configuration; } void set_reference_space(XrReferenceSpaceType p_reference_space); XrReferenceSpaceType get_reference_space() const { return reference_space; } void set_submit_depth_buffer(bool p_submit_depth_buffer); bool get_submit_depth_buffer() const { return submit_depth_buffer; } bool is_initialized(); bool is_running(); bool initialize(const String &p_rendering_driver); bool initialize_session(); void finish(); XrSpace get_play_space() const { return play_space; } XrTime get_next_frame_time() { return frame_state.predictedDisplayTime + frame_state.predictedDisplayPeriod; } bool can_render() { return instance != XR_NULL_HANDLE && session != XR_NULL_HANDLE && running && view_pose_valid && frame_state.shouldRender; } Size2 get_recommended_target_size(); XRPose::TrackingConfidence get_head_center(Transform3D &r_transform, Vector3 &r_linear_velocity, Vector3 &r_angular_velocity); bool get_view_transform(uint32_t p_view, Transform3D &r_transform); bool get_view_projection(uint32_t p_view, double p_z_near, double p_z_far, Projection &p_camera_matrix); bool process(); void pre_render(); bool pre_draw_viewport(RID p_render_target); RID get_color_texture(); RID get_depth_texture(); void post_draw_viewport(RID p_render_target); void end_frame(); // Display refresh rate float get_display_refresh_rate() const; void set_display_refresh_rate(float p_refresh_rate); Array get_available_display_refresh_rates() const; // Render Target size multiplier double get_render_target_size_multiplier() const; void set_render_target_size_multiplier(double multiplier); // action map String get_default_action_map_resource_name(); RID tracker_create(const String p_name); String tracker_get_name(RID p_tracker); void tracker_check_profile(RID p_tracker, XrSession p_session = XR_NULL_HANDLE); void tracker_free(RID p_tracker); RID action_set_create(const String p_name, const String p_localized_name, const int p_priority); String action_set_get_name(RID p_action_set); bool action_set_attach(RID p_action_set); void action_set_free(RID p_action_set); RID action_create(RID p_action_set, const String p_name, const String p_localized_name, OpenXRAction::ActionType p_action_type, const Vector<RID> &p_trackers); String action_get_name(RID p_action); void action_free(RID p_action); RID interaction_profile_create(const String p_name); String interaction_profile_get_name(RID p_interaction_profile); void interaction_profile_clear_bindings(RID p_interaction_profile); bool interaction_profile_add_binding(RID p_interaction_profile, RID p_action, const String p_path); bool interaction_profile_suggest_bindings(RID p_interaction_profile); void interaction_profile_free(RID p_interaction_profile); bool sync_action_sets(const Vector<RID> p_active_sets); bool get_action_bool(RID p_action, RID p_tracker); float get_action_float(RID p_action, RID p_tracker); Vector2 get_action_vector2(RID p_action, RID p_tracker); XRPose::TrackingConfidence get_action_pose(RID p_action, RID p_tracker, Transform3D &r_transform, Vector3 &r_linear_velocity, Vector3 &r_angular_velocity); bool trigger_haptic_pulse(RID p_action, RID p_tracker, float p_frequency, float p_amplitude, XrDuration p_duration_ns); void register_composition_layer_provider(OpenXRCompositionLayerProvider *provider); void unregister_composition_layer_provider(OpenXRCompositionLayerProvider *provider); const XrEnvironmentBlendMode *get_supported_environment_blend_modes(uint32_t &count); bool set_environment_blend_mode(XrEnvironmentBlendMode mode); OpenXRAPI(); ~OpenXRAPI(); }; #endif // OPENXR_API_H