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/*
* Copyright (C) 2021 Igalia, S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* aint with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#if ENABLE(WEBXR) && USE(OPENXR)
#include "OpenXRExtensions.h"
#include "PlatformXROpenXR.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/Scope.h>
#include <wtf/StdLibExtras.h>
using namespace WebCore;
namespace PlatformXR {
struct Instance::Impl {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
Impl();
~Impl();
XrInstance xrInstance() const { return m_instance; }
WorkQueue& queue() const { return m_workQueue; }
OpenXRExtensions* extensions() { return m_extensions.get(); }
private:
XrInstance m_instance { XR_NULL_HANDLE };
Ref<WorkQueue> m_workQueue;
std::unique_ptr<OpenXRExtensions> m_extensions;
};
Instance::Impl::Impl()
: m_workQueue(WorkQueue::create("OpenXR queue"_s))
{
m_workQueue->dispatch([this]() {
LOG(XR, "OpenXR: initializing\n");
m_extensions = OpenXRExtensions::create();
if (!m_extensions)
return;
static constexpr auto s_applicationName = "WebXR (WebKit)"_s;
static const uint32_t s_applicationVersion = 1;
const char* const enabledExtensions[] = {
XR_KHR_OPENGL_ENABLE_EXTENSION_NAME,
XR_MNDX_EGL_ENABLE_EXTENSION_NAME
};
auto createInfo = createStructure<XrInstanceCreateInfo, XR_TYPE_INSTANCE_CREATE_INFO>();
createInfo.createFlags = 0;
memcpySpan(std::span { createInfo.applicationInfo.applicationName }, s_applicationName.spanIncludingNullTerminator());
createInfo.applicationInfo.apiVersion = XR_CURRENT_API_VERSION;
createInfo.applicationInfo.applicationVersion = s_applicationVersion;
createInfo.enabledApiLayerCount = 0;
createInfo.enabledExtensionCount = std::size(enabledExtensions);
createInfo.enabledExtensionNames = enabledExtensions;
XrResult result = xrCreateInstance(&createInfo, &m_instance);
RETURN_IF_FAILED(result, "xrCreateInstance()", m_instance);
if (m_instance == XR_NULL_HANDLE)
return;
m_extensions->loadMethods(m_instance);
LOG(XR, "xrCreateInstance(): using instance %p\n", m_instance);
});
}
Instance::Impl::~Impl()
{
m_workQueue->dispatch([instance = m_instance] {
if (instance != XR_NULL_HANDLE)
xrDestroyInstance(instance);
});
}
Instance& Instance::singleton()
{
static LazyNeverDestroyed<Instance> s_instance;
static std::once_flag s_onceFlag;
std::call_once(s_onceFlag,
[&] {
s_instance.construct();
});
return s_instance.get();
}
Instance::Instance()
: m_impl(makeUniqueRef<Impl>())
{
}
void Instance::enumerateImmersiveXRDevices(CompletionHandler<void(const DeviceList& devices)>&& callback)
{
m_impl->queue().dispatch([this, callback = WTFMove(callback)]() mutable {
auto callbackOnExit = makeScopeExit([&]() {
callOnMainThread([callback = WTFMove(callback)]() mutable {
callback({ });
});
});
if (m_impl->xrInstance() == XR_NULL_HANDLE || !m_impl->extensions()) {
LOG(XR, "%s Unable to enumerate XR devices. No XrInstance present\n", __FUNCTION__);
return;
}
auto systemGetInfo = createStructure<XrSystemGetInfo, XR_TYPE_SYSTEM_GET_INFO>();
systemGetInfo.formFactor = XR_FORM_FACTOR_HEAD_MOUNTED_DISPLAY;
XrSystemId systemId;
XrResult result = xrGetSystem(m_impl->xrInstance(), &systemGetInfo, &systemId);
RETURN_IF_FAILED(result, "xrGetSystem", m_impl->xrInstance());
callbackOnExit.release();
callOnMainThread([this, callback = WTFMove(callback), systemId]() mutable {
m_immersiveXRDevices = DeviceList::from(OpenXRDevice::create(m_impl->xrInstance(), systemId, m_impl->queue(), *m_impl->extensions(), [this, callback = WTFMove(callback)]() mutable {
ASSERT(isMainThread());
callback(m_immersiveXRDevices);
}));
});
});
}
} // namespace PlatformXR
#endif // ENABLE(WEBXR) && USE(OPENXR)
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