Qualcomm_Snapdragon_VR_SDK SvrPluginAndroid脚本简介(16)

本文将对Qcom VR SDK中手柄相关的代码做简单的讲解。

	//---------------------------------------------------------------------------------------------
	//Controller Apis
	//---------------------------------------------------------------------------------------------

	/// <summary>
	/// Controllers the start tracking.
	/// </summary>
	/// <returns>The start tracking.</returns>
	/// <param name="desc">Desc.</param>
	//---------------------------------------------------------------------------------------------
    public override int ControllerStartTracking(string desc)
    {
        return SvrControllerStartTracking(desc);
    }
    
	/// <summary>
	/// Controllers the stop tracking.
	/// </summary>
	/// <param name="handle">Handle.</param>
	//---------------------------------------------------------------------------------------------
	public override void ControllerStopTracking(int handle)
    {
        SvrControllerStopTracking(handle);
    }

	/// <summary>
	/// Dumps the state.
	/// </summary>
	/// <param name="state">State.</param>
	//---------------------------------------------------------------------------------------------
	private void dumpState(SvrControllerState state)
	{
		String s = "{" + state.rotation + "}\n";
		s += "[" + state.position + "]\n";
		s += "<" + state.timestamp + ">\n";

		Debug.Log (s);
	}
    
	/// <summary>
	/// Controllers the state of the get.
	/// </summary>
	/// <returns>The get state.</returns>
	/// <param name="handle">Handle.</param>
	//---------------------------------------------------------------------------------------------
	public override SvrControllerState ControllerGetState(int handle)
    {
		SvrControllerState state = new SvrControllerState();
		SvrControllerGetState (handle, ref state);
		//dumpState (state);
 		return state;
    }

	/// <summary>
	/// Controllers the send event.
	/// </summary>
	/// <param name="handle">Handle.</param>
	/// <param name="what">What.</param>
	/// <param name="arg1">Arg1.</param>
	/// <param name="arg2">Arg2.</param>
	//---------------------------------------------------------------------------------------------
	public override void ControllerSendMessage(int handle, SvrController.svrControllerMessageType what, int arg1, int arg2)
	{
		SvrControllerSendMessage (handle, (int)what, arg1, arg2);
	}

	/// <summary>
	/// Controllers the query.
	/// </summary>
	/// <returns>The query.</returns>
	/// <param name="handle">Handle.</param>
	/// <param name="what">What.</param>
	/// <param name="mem">Mem.</param>
	/// <param name="size">Size.</param>
	//---------------------------------------------------------------------------------------------
	public override object ControllerQuery(int handle, SvrController.svrControllerQueryType what)
	{
		int memorySize = 0;
		IntPtr memory = IntPtr.Zero;
		object result = null;

		System.Type typeOfObject = null;

		switch(what)
		{
			case SvrController.svrControllerQueryType.kControllerBatteryRemaining:
				{
					typeOfObject = typeof(int);
					memorySize = System.Runtime.InteropServices.Marshal.SizeOf (typeOfObject);
					memory = System.Runtime.InteropServices.Marshal.AllocHGlobal (memorySize);	
	}
				break;
}

		int writtenBytes = SvrControllerQuery (handle, (int)what, memory, memorySize);

		if (memorySize == writtenBytes) {
			result = System.Runtime.InteropServices.Marshal.PtrToStructure (memory, typeOfObject);
		}
			
		if (memory != IntPtr.Zero) {
			Marshal.FreeHGlobal (memory);
		}
			
		return result;
	}

在SvrPluginAndroid脚本中

ControllerStartTracking和ControllerStopTracking分别负责手柄的连接和停止。

ControllerGetState方法返回的是当前手柄的状态。

ControllerSendMessage方法是向底层手柄相关代码中发送消息