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/*************************************************************************/
/* openxr_fb_passthrough_extension_wrapper.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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. */
/*************************************************************************/
#include "openxr_fb_passthrough_extension_wrapper.h"
#include "core/os/os.h"
#include "scene/main/viewport.h"
#include "scene/main/window.h"
using namespace godot;
OpenXRFbPassthroughExtensionWrapper *OpenXRFbPassthroughExtensionWrapper::singleton = nullptr;
OpenXRFbPassthroughExtensionWrapper *OpenXRFbPassthroughExtensionWrapper::get_singleton() {
return singleton;
}
OpenXRFbPassthroughExtensionWrapper::OpenXRFbPassthroughExtensionWrapper(OpenXRAPI *p_openxr_api) :
OpenXRExtensionWrapper(p_openxr_api) {
request_extensions[XR_FB_PASSTHROUGH_EXTENSION_NAME] = &fb_passthrough_ext;
request_extensions[XR_FB_TRIANGLE_MESH_EXTENSION_NAME] = &fb_triangle_mesh_ext;
singleton = this;
}
OpenXRFbPassthroughExtensionWrapper::~OpenXRFbPassthroughExtensionWrapper() {
cleanup();
}
void OpenXRFbPassthroughExtensionWrapper::cleanup() {
fb_passthrough_ext = false;
fb_triangle_mesh_ext = false;
}
Viewport *OpenXRFbPassthroughExtensionWrapper::get_main_viewport() {
MainLoop *main_loop = OS::get_singleton()->get_main_loop();
if (!main_loop) {
print_error("Unable to retrieve main loop");
return nullptr;
}
auto *scene_tree = Object::cast_to<SceneTree>(main_loop);
if (!scene_tree) {
print_error("Unable to retrieve scene tree");
return nullptr;
}
Viewport *viewport = scene_tree->get_root()->get_viewport();
return viewport;
}
void OpenXRFbPassthroughExtensionWrapper::on_instance_created(const XrInstance instance) {
if (fb_passthrough_ext) {
bool result = initialize_fb_passthrough_extension(instance);
if (!result) {
print_error("Failed to initialize fb_passthrough extension");
fb_passthrough_ext = false;
}
}
if (fb_triangle_mesh_ext) {
bool result = initialize_fb_triangle_mesh_extension(instance);
if (!result) {
print_error("Failed to initialize fb_triangle_mesh extension");
fb_triangle_mesh_ext = false;
}
}
if (fb_passthrough_ext) {
openxr_api->register_composition_layer_provider(this);
}
}
bool OpenXRFbPassthroughExtensionWrapper::is_passthrough_enabled() {
return fb_passthrough_ext && passthrough_handle != XR_NULL_HANDLE && passthrough_layer != XR_NULL_HANDLE;
}
bool OpenXRFbPassthroughExtensionWrapper::is_composition_passthrough_layer_ready() {
return fb_passthrough_ext && passthrough_handle != XR_NULL_HANDLE && composition_passthrough_layer.layerHandle != XR_NULL_HANDLE;
}
bool OpenXRFbPassthroughExtensionWrapper::start_passthrough() {
if (passthrough_handle == XR_NULL_HANDLE) {
return false;
}
if (is_passthrough_enabled()) {
return true;
}
// Start the passthrough feature
XrResult result = xrPassthroughStartFB(passthrough_handle);
if (!is_valid_passthrough_result(result, "Failed to start passthrough")) {
stop_passthrough();
return false;
}
// Create the passthrough layer
result = xrCreatePassthroughLayerFB(openxr_api->get_session(), &passthrough_layer_config, &passthrough_layer);
if (!is_valid_passthrough_result(result, "Failed to create the passthrough layer")) {
stop_passthrough();
return false;
}
// Check if the the viewport has transparent background
Viewport *viewport = get_main_viewport();
if (viewport && !viewport->has_transparent_background()) {
print_error("Main viewport doesn't have transparent background! Passthrough may not properly render.");
}
composition_passthrough_layer.layerHandle = passthrough_layer;
return true;
}
void OpenXRFbPassthroughExtensionWrapper::on_session_created(const XrSession session) {
if (fb_passthrough_ext) {
// Create the passthrough feature and start it.
XrResult result = xrCreatePassthroughFB(openxr_api->get_session(), &passthrough_create_info, &passthrough_handle);
if (!openxr_api->xr_result(result, "Failed to create passthrough")) {
passthrough_handle = XR_NULL_HANDLE;
return;
}
}
}
XrCompositionLayerBaseHeader *OpenXRFbPassthroughExtensionWrapper::get_composition_layer() {
if (is_composition_passthrough_layer_ready()) {
return (XrCompositionLayerBaseHeader *)&composition_passthrough_layer;
} else {
return nullptr;
}
}
void OpenXRFbPassthroughExtensionWrapper::stop_passthrough() {
if (!fb_passthrough_ext) {
return;
}
composition_passthrough_layer.layerHandle = XR_NULL_HANDLE;
XrResult result;
if (passthrough_layer != XR_NULL_HANDLE) {
// Destroy the layer
result = xrDestroyPassthroughLayerFB(passthrough_layer);
openxr_api->xr_result(result, "Unable to destroy passthrough layer");
passthrough_layer = XR_NULL_HANDLE;
}
if (passthrough_handle != XR_NULL_HANDLE) {
result = xrPassthroughPauseFB(passthrough_handle);
openxr_api->xr_result(result, "Unable to stop passthrough feature");
}
}
void OpenXRFbPassthroughExtensionWrapper::on_session_destroyed() {
if (fb_passthrough_ext) {
stop_passthrough();
XrResult result;
if (passthrough_handle != XR_NULL_HANDLE) {
result = xrDestroyPassthroughFB(passthrough_handle);
openxr_api->xr_result(result, "Unable to destroy passthrough feature");
passthrough_handle = XR_NULL_HANDLE;
}
}
}
void OpenXRFbPassthroughExtensionWrapper::on_instance_destroyed() {
if (fb_passthrough_ext) {
openxr_api->unregister_composition_layer_provider(this);
}
cleanup();
}
bool OpenXRFbPassthroughExtensionWrapper::initialize_fb_passthrough_extension(const XrInstance p_instance) {
ERR_FAIL_NULL_V(openxr_api, false);
EXT_INIT_XR_FUNC_V(xrCreatePassthroughFB);
EXT_INIT_XR_FUNC_V(xrDestroyPassthroughFB);
EXT_INIT_XR_FUNC_V(xrPassthroughStartFB);
EXT_INIT_XR_FUNC_V(xrPassthroughPauseFB);
EXT_INIT_XR_FUNC_V(xrCreatePassthroughLayerFB);
EXT_INIT_XR_FUNC_V(xrDestroyPassthroughLayerFB);
EXT_INIT_XR_FUNC_V(xrPassthroughLayerPauseFB);
EXT_INIT_XR_FUNC_V(xrPassthroughLayerResumeFB);
EXT_INIT_XR_FUNC_V(xrPassthroughLayerSetStyleFB);
EXT_INIT_XR_FUNC_V(xrCreateGeometryInstanceFB);
EXT_INIT_XR_FUNC_V(xrDestroyGeometryInstanceFB);
EXT_INIT_XR_FUNC_V(xrGeometryInstanceSetTransformFB);
return true;
}
bool OpenXRFbPassthroughExtensionWrapper::initialize_fb_triangle_mesh_extension(const XrInstance p_instance) {
ERR_FAIL_NULL_V(openxr_api, false);
EXT_INIT_XR_FUNC_V(xrCreateTriangleMeshFB);
EXT_INIT_XR_FUNC_V(xrDestroyTriangleMeshFB);
EXT_INIT_XR_FUNC_V(xrTriangleMeshGetVertexBufferFB);
EXT_INIT_XR_FUNC_V(xrTriangleMeshGetIndexBufferFB);
EXT_INIT_XR_FUNC_V(xrTriangleMeshBeginUpdateFB);
EXT_INIT_XR_FUNC_V(xrTriangleMeshEndUpdateFB);
EXT_INIT_XR_FUNC_V(xrTriangleMeshBeginVertexBufferUpdateFB);
EXT_INIT_XR_FUNC_V(xrTriangleMeshEndVertexBufferUpdateFB);
return true;
}
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