101 lines
2.2 KiB
Java
101 lines
2.2 KiB
Java
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/**
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* AppleIIGo
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* Apple II Emulator for J2ME
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* (C) 2006 by Marc S. Ressl(ressl@lonetree.com)
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* Released under the GPL
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*/
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public class Paddle {
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// Public variables
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public static final int PADDLE_LOW = 0;
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public static final int PADDLE_CENTER = 127;
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public static final int PADDLE_HIGH = 255;
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public static final int PADDLEMODE_DIRECT = 0;
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public static final int PADDLEMODE_FILTERED = 1;
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// Instances of other classes
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private EmAppleII apple;
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// Button variables
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private int[] buttonRegister = new int[4];
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// Paddle variables
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private int paddleMode;
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private int[] paddleClockEvent = new int[4];
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private int[] paddleClockInc = new int[4];
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/**
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* Paddle class constructor
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*
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* @param apple The EmAppleII instance
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*/
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public Paddle(EmAppleII apple) {
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this.apple = apple;
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setPaddlePos(0, PADDLE_CENTER);
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setPaddlePos(1, PADDLE_CENTER);
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setPaddlePos(2, PADDLE_CENTER);
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setPaddlePos(3, PADDLE_CENTER);
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}
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/**
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* Set button state
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*
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* @param button Paddle button
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* @param state State
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*/
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public void setButton(int button, boolean pressed) {
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buttonRegister[button] = (pressed ? 0x80 : 0x00);
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}
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/**
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* Button register
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*
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* @param button Paddle button
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*/
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public int getButtonRegister(int button) {
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return buttonRegister[button];
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}
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/**
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* Set paddle position
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*
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* @param address Address
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* @param value Value
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*/
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public void setPaddlePos(int paddle, int value) {
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/*
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* Magic formula, see ROM $FB1E-$FB2E,
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* We calculate the numbers of cycles after which
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* the RC circuit of a triggered paddle will discharge.
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*/
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paddleClockInc[paddle] = value * 11 + 8;
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}
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/**
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* Trigger paddle register
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*
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* @param address Address
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* @param value Value
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*/
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public void triggerRegister() {
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paddleClockEvent[0] = apple.clock + paddleClockInc[0];
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paddleClockEvent[1] = apple.clock + paddleClockInc[1];
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paddleClockEvent[2] = apple.clock + paddleClockInc[2];
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paddleClockEvent[3] = apple.clock + paddleClockInc[3];
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}
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/**
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* Get paddle register
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*
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* @param address Address
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* @param value Value
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*/
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public int getPaddleRegister(int paddle) {
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return ((((paddleClockEvent[paddle] - apple.clock) & 0x7fffffff) < 0x40000000) ? 0x80 : 0x00);
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}
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}
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