Adding WebVR interface to Blink

public/platform/WebVR.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WebVR_h
+#define WebVR_h
+
+#include "WebCommon.h"
+
+#if BLINK_IMPLEMENTATION
+#include "wtf/Assertions.h"
+#endif
+
+namespace blink {
+
+struct WebVRVector3 {
+    float x, y, z;
+};
+
+struct WebVRVector4 {
+    float x, y, z, w;
+};
+
+// A field of view, given by 4 degrees describing the view from a center point.
+struct WebVRFieldOfView {
+    float upDegrees;
+    float downDegrees;
+    float leftDegrees;
+    float rightDegrees;
+};
+
+// Bit flags to indicate which fields of an WebHMDSensorState are valid.
+enum WebVRSensorStateFlags {
+    WebVRSensorStateOrientation = 1 << 1,
+    WebVRSensorStatePosition = 1 << 2,
+    WebVRSensorStateAngularVelocity = 1 << 3,
+    WebVRSensorStateLinearVelocity = 1 << 4,
+    WebVRSensorStateAngularAcceleration = 1 << 5,
+    WebVRSensorStateLinearAcceleration = 1 << 6,
+    WebVRSensorStateComplete = (1 << 7) - 1 // All previous states combined.
+};
+
+// A bitfield of WebVRSensorStateFlags.
+typedef int WebVRSensorStateMask;
+
+// A sensor's position, orientation, velocity, and acceleration state at the
+// given timestamp.
+struct WebHMDSensorState {
+    double timestamp;
+    unsigned frameIndex;
+    WebVRSensorStateMask flags;
+    WebVRVector4 orientation;
+    WebVRVector3 position;
+    WebVRVector3 angularVelocity;
+    WebVRVector3 linearVelocity;
+    WebVRVector3 angularAcceleration;
+    WebVRVector3 linearAcceleration;
+};
+
+// Information about the optical properties for an eye in an HMD.
+struct WebVREyeParameters {
+    WebVRFieldOfView minimumFieldOfView;
+    WebVRFieldOfView maximumFieldOfView;
+    WebVRFieldOfView recommendedFieldOfView;
+    WebVRVector3 eyeTranslation;
+};
+
+// Information pertaining to Head Mounted Displays.
+struct WebVRHMDInfo {
+    WebVREyeParameters leftEye;
+    WebVREyeParameters rightEye;
+};
+
+// Bit flags to indicate what type of data a WebVRDevice describes.
+enum WebVRDeviceTypeFlags {
+    WebVRDeviceTypePosition = 1 << 1,
+    WebVRDeviceTypeHMD = 1 << 2
+};
+
+// A bitfield of WebVRDeviceTypeFlags.
+typedef int WebVRDeviceTypeMask;
+
+// Describes a single VR hardware unit. May describe multiple capabilities,
+// such as position sensors or head mounted display metrics.
+class WebVRDevice {
+public:
+    static const size_t deviceIdLengthCap = 128;
+    static const size_t deviceNameLengthCap = 128;
+
+    WebVRDevice()
+        : flags(0)
+    {
+        deviceId[0] = 0;
+        deviceName[0] = 0;
+    }
+
+    // Index for this hardware unit.
+    unsigned index;
+    // Device identifier (based on manufacturer, model, etc.).
+    WebUChar deviceId[deviceIdLengthCap];
+    // Friendly device name.
+    WebUChar deviceName[deviceNameLengthCap];
+    // Identifies the capabilities of this hardware unit.
+    WebVRDeviceTypeMask flags;
+
+    // Will only contain valid data if (flags & HasHMDDevice).
+    WebVRHMDInfo hmdInfo;
+};
+
+}
+
+#endif // WebVR_h