Adding WebVR interface to Blink

public/platform/WebVR.h

+// Copyright 2014 The Chromium Authors. All rights reserved.

[haraken, 2015/02/25 11:52:56]

2015

+// 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 {

[sof, 2015/02/25 06:30:34]

Could we have some comments, description, something here? i.e., a set of base
types that Blink defines to the outside world should be a bit more carefully
declared than what it looks right now.

+
+#pragma pack(push, 1)

[haraken, 2015/02/25 11:52:56]

Does this really matter? (Otherwise, we don't want to use unnecessary pragmas.)

+
+struct WebVRVector3 {
+    float x, y, z;
+};
+
+struct WebVRVector4 {
+    float x, y, z, w;
+};
+
+struct WebVRFieldOfView {
+    float upDegrees;
+    float downDegrees;
+    float leftDegrees;
+    float rightDegrees;
+};
+
+enum WebVRSensorState {
+    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 WebVRSensorState
+typedef int WebVRSensorStateMask;
+
+enum WebVRDeviceType {
+    WebVRDeviceTypePosition = 1 << 1,
+    WebVRDeviceTypeHMD = 1 << 2
+};
+
+// A bitfield of WebVRDeviceType
+typedef int WebVRDeviceTypeMask;
+
+class WebHMDSensorState {
+public:
+    WebHMDSensorState()
+    {
+    }
+
+    double timestamp;
+    unsigned frameIndex;
+    WebVRSensorStateMask flags;
+    WebVRVector4 orientation;
+    WebVRVector3 position;
+    WebVRVector3 angularVelocity;
+    WebVRVector3 linearVelocity;
+    WebVRVector3 angularAcceleration;
+    WebVRVector3 linearAcceleration;
+};
+
+struct WebVRHMDInfo {
+    WebVRFieldOfView recommendedFOVLeft;
+    WebVRFieldOfView recommendedFOVRight;
+    WebVRFieldOfView maximumFOVLeft;
+    WebVRFieldOfView maximumFOVRight;
+    WebVRVector3 eyeTranslationLeft;
+    WebVRVector3 eyeTranslationRight;
+};
+
+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];
+
+    WebVRDeviceTypeMask flags;
+
+    // Will only contain valid data if (flags & HasHMDDevice)
+    WebVRHMDInfo hmdInfo;
+};
+
+#pragma pack(pop)
+
+}
+
+#endif // WebVR_h