mirror of
https://github.com/whscullin/apple2js.git
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323 lines
9.7 KiB
TypeScript
323 lines
9.7 KiB
TypeScript
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import { Card, byte, word, Restorable } from '../types';
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import CPU6502, { CpuState } from '../cpu6502';
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import { debug } from '../util';
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import { rom } from '../roms/cards/mouse';
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const CLAMP_MIN_LOW = 0x478;
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const CLAMP_MAX_LOW = 0x4F8;
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const CLAMP_MIN_HIGH = 0x578;
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const CLAMP_MAX_HIGH = 0x5F8;
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const X_LOW = 0x478;
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const Y_LOW = 0x4F8;
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const X_HIGH = 0x578;
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const Y_HIGH = 0x5F8;
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const STATUS = 0x778;
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const MODE = 0x7F8;
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const STATUS_DOWN = 0x80;
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const STATUS_LAST = 0x40;
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const STATUS_MOVED = 0x20;
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const INT_SCREEN = 0x08;
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const INT_PRESS = 0x04;
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const INT_MOVE = 0x02;
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const MODE_ON = 0x01;
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const MODE_INT_MOVE = 0x02;
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const MODE_INT_PRESS = 0x04;
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const MODE_INT_VBL = 0x08;
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/**
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* Firmware routine offset pointers
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*/
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const ENTRIES = {
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SET_MOUSE: 0x12,
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SERVE_MOUSE: 0x13,
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READ_MOUSE: 0x14,
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CLEAR_MOUSE: 0x15,
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POS_MOUSE: 0x16,
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CLAMP_MOUSE: 0x17,
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HOME_MOUSE: 0x18,
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INIT_MOUSE: 0x19
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};
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interface MouseState {
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clampXMin: word;
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clampYMin: word;
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clampXMax: word
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clampYMax: word;
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x: word;
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y: word;
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mode: byte;
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down: boolean;
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lastDown: boolean;
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lastX: word;
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lastY: word;
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serve: byte;
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shouldIntMove: boolean;
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shouldIntPress: boolean;
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slot: byte;
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}
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export default class Mouse implements Card, Restorable<MouseState> {
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/** Lowest mouse X */
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private clampXMin: word = 0;
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/** Lowest mouse Y */
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private clampYMin: word = 0;
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/** Highest mouse X */
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private clampXMax: word = 0x3FF;
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/** Highest mouse Y */
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private clampYMax: word = 0x3FF;
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/** Mouse X position */
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private x: word = 0;
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/** Mouse Y position */
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private y: word = 0;
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/** Mouse mode */
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private mode: byte = 0;
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/** Mouse button down state */
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private down = false;
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/** Last mouse button down state */
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private lastDown = false;
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/** Last mouse Y Position */
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private lastX: word = 0;
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/** Last mouse X position */
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private lastY: word = 0;
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/** Interrupt service flags */
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private serve: byte = 0;
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/** Move happened since last refresh */
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private shouldIntMove = false;
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/** Button press happened since last refresh */
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private shouldIntPress = false;
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/** Slot for screen hole indexing */
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private slot = 0;
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constructor(
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private cpu: CPU6502,
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private cbs: {
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setMouse: (mouse: Mouse) => void,
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mouseMode: (on: boolean) => void
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}
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) {
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this.cbs.setMouse(this);
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}
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ioSwitch(_off: byte, _val?: byte) {
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return undefined;
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}
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read(_page: byte, off: byte) {
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let state = this.cpu.getState();
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const holeWrite = (addr: word, val: byte) => {
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this.cpu.write(addr >> 8, (addr & 0xff) + this.slot, val);
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};
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const holeRead = (addr: word) => {
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return this.cpu.read(addr >> 8, addr & 0xff);
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};
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const clearCarry = (state: CpuState) => {
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state.s &= 0xFE;
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return state;
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};
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if (this.cpu.getSync()) {
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switch (off) {
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case rom[ENTRIES.SET_MOUSE]:
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{
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this.mode = state.a;
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this.cbs.mouseMode(!!(this.mode & MODE_ON));
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state = clearCarry(state);
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// debug(
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// 'setMouse ',
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// (_mode & MODE_ON ? 'Mouse on ' : 'Mouse off '),
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// (_mode & MODE_INT_MOVE ? 'Move interrupt ' : '') +
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// (_mode & MODE_INT_PRESS ? 'Move press ' : '') +
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// (_mode & MODE_INT_VBL ? 'Move VBL ' : '')
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// );
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}
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break;
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case rom[ENTRIES.SERVE_MOUSE]:
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// debug('serveMouse');
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holeWrite(STATUS, this.serve);
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state = clearCarry(state);
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this.serve = 0;
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break;
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case rom[ENTRIES.READ_MOUSE]:
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{
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const moved = (this.lastX !== this.x) || (this.lastY !== this.y);
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const status =
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(this.down ? STATUS_DOWN : 0) |
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(this.lastDown ? STATUS_LAST : 0) |
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(moved ? STATUS_MOVED : 0);
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const mouseXLow = this.x & 0xff;
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const mouseYLow = this.y & 0xff;
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const mouseXHigh = this.x >> 8;
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const mouseYHigh = this.y >> 8;
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// debug({ mouseXLow, mouseYLow, mouseXHigh, mouseYHigh });
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holeWrite(X_LOW, mouseXLow);
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holeWrite(Y_LOW, mouseYLow);
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holeWrite(X_HIGH, mouseXHigh);
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holeWrite(Y_HIGH, mouseYHigh);
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holeWrite(STATUS, status);
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holeWrite(MODE, this.mode);
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this.lastDown = this.down;
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this.lastX = this.x;
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this.lastY = this.y;
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state = clearCarry(state);
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}
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break;
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case rom[ENTRIES.CLEAR_MOUSE]:
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debug('clearMouse');
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state = clearCarry(state);
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break;
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case rom[ENTRIES.POS_MOUSE]:
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debug('posMouse');
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state = clearCarry(state);
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break;
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case rom[ENTRIES.CLAMP_MOUSE]:
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{
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const clampY = state.a;
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if (clampY) {
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this.clampYMin = holeRead(CLAMP_MIN_LOW) | (holeRead(CLAMP_MIN_HIGH) << 8);
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this.clampYMax = holeRead(CLAMP_MAX_LOW) | (holeRead(CLAMP_MAX_HIGH) << 8);
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debug('clampMouse Y', this.clampYMin, this.clampYMax);
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} else {
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this.clampXMin = holeRead(CLAMP_MIN_LOW) | (holeRead(CLAMP_MIN_HIGH) << 8);
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this.clampXMax = holeRead(CLAMP_MAX_LOW) | (holeRead(CLAMP_MAX_HIGH) << 8);
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debug('clampMouse X', this.clampXMin, this.clampXMax);
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}
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state = clearCarry(state);
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}
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break;
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case rom[ENTRIES.HOME_MOUSE]:
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{
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debug('homeMouse');
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this.x = this.clampXMin;
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this.y = this.clampYMin;
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state = clearCarry(state);
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}
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break;
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case rom[ENTRIES.INIT_MOUSE]:
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{
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this.slot = state.y >> 4;
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debug('initMouse slot', this.slot);
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state = clearCarry(state);
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}
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break;
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}
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this.cpu.setState(state);
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}
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return rom[off];
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}
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write() {}
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/**
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* Triggers interrupts based on activity since the last tick
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*/
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tick() {
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if (this.mode & MODE_INT_VBL) {
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this.serve |= INT_SCREEN;
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}
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if ((this.mode & MODE_INT_PRESS) && this.shouldIntPress) {
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this.serve |= INT_PRESS;
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}
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if ((this.mode & MODE_INT_MOVE) && this.shouldIntMove) {
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this.serve |= INT_MOVE;
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}
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if (this.serve) {
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this.cpu.irq();
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}
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this.shouldIntMove = false;
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this.shouldIntPress = false;
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}
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/**
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* Scales mouse position and clamps to min and max,and flags
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* potential mouse state change interrupt
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*
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* @param x Client mouse X position
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* @param y Client mouse Y position
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* @param w Client width
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* @param h Client height
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*/
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setMouseXY(x: number, y: number, w: number, h: number) {
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const rangeX = this.clampXMax - this.clampXMin;
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const rangeY = this.clampYMax - this.clampYMin;
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this.x = (x * rangeX / w + this.clampXMin) & 0xffff;
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this.y = (y * rangeY / h + this.clampYMin) & 0xffff;
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this.shouldIntMove = true;
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}
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/**
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* Tracks mouse button state and flags potential
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* mouse state change interrupt
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*
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* @param down Mouse button down state
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*/
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setMouseDown(down: boolean) {
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this.shouldIntPress = this.down !== down;
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this.down = down;
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}
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/**
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* Restores saved state
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*
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* @param state stored state
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*/
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setState(state: MouseState) {
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this.clampXMin = state.clampXMin;
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this.clampYMin = state.clampYMin;
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this.clampXMax = state.clampXMax;
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this.clampYMax = state.clampYMax;
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this.x = state.x;
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this.y = state.y;
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this.mode = state.mode;
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this.down = state.down;
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this.lastDown = state.lastDown;
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this.lastX = state.lastX;
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this.lastY = state.lastY;
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this.serve = state.serve;
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this.shouldIntMove = state.shouldIntMove;
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this.shouldIntPress = state.shouldIntPress;
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this.slot = state.slot;
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}
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/**
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* Saves state for restoration
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*
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* @returns restorable state
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*/
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getState(): MouseState {
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return {
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clampXMin: this.clampXMin,
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clampYMin: this.clampYMin,
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clampXMax: this.clampXMax,
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clampYMax: this.clampYMax,
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x: this.x,
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y: this.y,
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mode: this.mode,
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down: this.down,
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lastDown: this.lastDown,
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lastX: this.lastX,
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lastY: this.lastY,
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serve: this.serve,
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shouldIntMove: this.shouldIntMove,
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shouldIntPress: this.shouldIntPress,
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slot: this.slot
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};
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}
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}
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