simple vr button

src/components/misc/VRButton.vue

@@ -0,0 +1,91 @@
+<template>
+  <button @click="onClick">{{ message }}</button>
+</template>
+
+<script>
+// from threejs/examples/jsm/webxr/VRButton.js
+export default {
+  props: {
+    enterMessage: { type: String, default: 'ENTER VR' },
+    exitMessage: { type: String, default: 'EXIT VR' },
+  },
+  data() {
+    return {
+      error: '',
+      xrSupport: false,
+      currentSession: null,
+    };
+  },
+  computed: {
+    message() {
+      if (this.xrSupport) {
+        return this.currentSession ? this.exitMessage : this.enterMessage;
+      } else if (this.error) {
+        return this.error;
+      }
+      return '';
+    },
+  },
+  created() {
+    if ('xr' in navigator) {
+      navigator.xr.isSessionSupported('immersive-vr').then((supported) => {
+        this.xrSupport = supported;
+      });
+    } else {
+      if (window.isSecureContext === false) {
+        this.error = 'WEBXR NEEDS HTTPS';
+      } else {
+        this.error = 'WEBXR NOT AVAILABLE';
+      }
+    }
+  },
+  methods: {
+    init(renderer) {
+      this.renderer = renderer;
+    },
+    onClick() {
+      if (!this.xrSupport) return;
+      if (!this.renderer) return;
+
+      if (this.currentSession) {
+        this.currentSession.end();
+      } else {
+        const sessionInit = { optionalFeatures: ['local-floor', 'bounded-floor', 'hand-tracking'] };
+        navigator.xr.requestSession('immersive-vr', sessionInit).then(this.onSessionStarted);
+      }
+    },
+    async onSessionStarted(session) {
+      session.addEventListener('end', this.onSessionEnded);
+      await this.renderer.xr.setSession(session);
+      this.currentSession = session;
+    },
+    onSessionEnded() {
+      this.currentSession.removeEventListener('end', this.onSessionEnded);
+      this.currentSession = null;
+    },
+  },
+};
+</script>
+
+<style scoped>
+button {
+  cursor: pointer;
+  position: absolute;
+  width: 100px;
+  left: calc(50% - 50px);
+  bottom: 20px;
+  padding: 12px 6px;
+  border: 1px solid #fff;
+  border-radius: 4px;
+  background: rgba(0,0,0,0.1);
+  color: #fff;
+  font: normal 13px sans-serif;
+  text-align: center;
+  opacity: 0.5;
+  outline: none;
+  z-index: 999;
+}
+button:hover {
+  opacity: 1;
+}
+</style>