//===========================================================================//
// File:	PCmouse.cc                                                          //
// Project: MUNGA           Brick: Platform-specific IO                      //
// Contents: PC mouse interface                                              //
//---------------------------------------------------------------------------//
//   Date    Who  Modification                                               //
// --------  ---  -----------------------------------------------------------//
// 01/24/95  CPB  Initial coding.                                            //
//---------------------------------------------------------------------------//
// Copyright (C) 1995, Virtual World Entertainment, Inc. All rights reserved //
//                      PROPRIETARY and CONFIDENTIAL                         //
//===========================================================================//

#include <mungal4.hpp>
#pragma hdrstop

#if !defined(L4MOUSE_HPP)
#	include <l4mouse.hpp>
#endif

#define MOUSEINT	0x33

//
//############################################################################
// Creator - reset the driver and check for existence
//
//############################################################################
//
Mouse::Mouse()
{
	Check_Pointer(this);

	//
	//-----------------------------------------------
	// Reset driver and read status
	//-----------------------------------------------
	//
	_AX = 0;
	geninterrupt(MOUSEINT);

	//
	//-----------------------------------------------
	// AX will be zero if error, 0xFFFF if ok.
	// BX is the number of buttons.
	//-----------------------------------------------
	//
	if (_AX == 0xFFFF)
	{
		ButtonCount = _BX;
		Errors = 0;
	}
	else
	{
		Errors = 1;
		ButtonCount = 0;
	}
	Check_Fpu();
}

Logical
	Mouse::TestInstance() const
{
	return True;
}

//
//############################################################################
// ReadCounters - return how many 'mickeys' the mouse has moved
// since the last call
//############################################################################
//
void
	Mouse::ReadCounters(int *xp, int *yp)
{
	Check(this);
	Check_Pointer(xp);
	Check_Pointer(yp);

	if (Errors)
	{
		*xp = 0;
		*yp = 0;
	}
	else
	{
		//
		//-----------------------------------------------
		// Read motion counters
		//-----------------------------------------------
		//
		_AX = 0x000B;
		geninterrupt(MOUSEINT);

		//
		//-----------------------------------------------
		// CX = UNSIGNED x counter,
		// DX = UNSIGNED y counter.
		// These must be converted to signed values.
		//-----------------------------------------------
		//
		int a = _CX;
		int b = _DX;
		if (a & 0x8000)
		{
			a |= (int)(~65535L);
		}
		if (b & 0x8000)
		{
			b |= (int)(~65535L);
		}

		*xp = a;
		*yp = b;
	}
	Check_Fpu();
}

//
//############################################################################
// ButtonPressed - return the number of times a given button was pressed
// since the last call
//############################################################################
//
int
	Mouse::ButtonPressed(int buttonNum)
{
	Check(this);
	if (Errors)
	{
		return 0;
	}
	else
	{
		//
		//-----------------------------------------------
		// Read button press data
		//-----------------------------------------------
		//
		_AX = 0x0005;
		_BX = (unsigned short) buttonNum;
		geninterrupt(MOUSEINT);

		//
		//-----------------------------------------------
		// AX = current button states
		// BX = number of times pressed since last call
		//-----------------------------------------------
		//
		return (int) _BX;
	}
}

//
//############################################################################
// ButtonReleased - return the number of times a given button was released
// since the last call
//############################################################################
//
int
	 Mouse::ButtonReleased(int buttonNum)
{
	Check(this);
	if (Errors)
	{
		return 0;
	}
	else
	{
		//
		//-----------------------------------------------
		// Read button press data
		//-----------------------------------------------
		//
		_AX = 0x0006;
		_BX = (unsigned short) buttonNum;
		geninterrupt(MOUSEINT);

		//
		//-----------------------------------------------
		// AX = current button states
		// BX = number of times pressed since last call
		//-----------------------------------------------
		//
		return _BX;
	}
}