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https://github.com/whscullin/apple2js.git
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492 lines
15 KiB
JavaScript
492 lines
15 KiB
JavaScript
/* Copyright 2010-2016 Will Scullin <scullin@scullinsteel.com>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation. No representations are made about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*/
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/*
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* Text Page 1 Drawing
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*/
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/*globals allocMemPages: false,
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base64_encode: false, base64_decode: false */
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/*exported LoresPage, HiresPage, VideoModes*/
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var textMode = true;
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var mixedMode = true;
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var hiresMode = false;
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var pageMode = 1;
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var pages = [];
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var context = null;
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var scanlines = false;
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/****************************************************************************
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*
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* Text/Lores Graphics
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*
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***************************************************************************/
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function LoresPage(page, charset)
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{
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'use strict';
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// $00-$3F inverse
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// $40-$7F flashing
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// $80-$FF normal
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var _page = page;
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var _buffer = [];
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var _refreshing = false;
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var _greenMode = false;
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var _blink = false;
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var _black = [0x00,0x00,0x00];
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var _white = [0xff,0xff,0xff];
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var _green = [0x00,0xff,0x80];
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var _colors = [
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[0x00,0x00,0x00], // black
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[0xdd,0x00,0x33], // 0x1 deep red
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[0x00,0x00,0x99], // 0x2 dark blue
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[0xdd,0x00,0xdd], // 0x3 purple
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[0x00,0x77,0x00], // 0x4 dark green
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[0x55,0x55,0x55], // 0x5 dark gray
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[0x23,0x22,0xff], // 0x6 medium blue
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[0x66,0xaa,0xff], // 0x7 light blue
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[0x88,0x55,0x22], // 0x8 brown
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[0xff,0x66,0x00], // 0x9 orange
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[0xaa,0xaa,0xaa], // 0xa light gray
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[0xff,0x99,0x88], // 0xb pink
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[0x00,0xdd,0x00], // 0xc green
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[0xff,0xff,0x00], // 0xd yellow
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[0x00,0xff,0x99], // 0xe aquamarine
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[0xff,0xff,0xff] // 0xf white
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];
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function _init() {
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_buffer = allocMemPages(0x4);
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for (var idx = 0; idx < 0x400; idx++) {
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_buffer[idx] = 0;
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}
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}
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function _drawPixel(data, off, color) {
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var c0 = color[0], c1 = color[1], c2 = color[2];
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data[off + 0] = data[off + 4] = c0;
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data[off + 1] = data[off + 5] = c1;
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data[off + 2] = data[off + 6] = c2;
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if (!scanlines) {
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data[off + 560 * 4] = data[off + 560 * 4 + 4] = c0;
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data[off + 560 * 4 + 1] = data[off + 560 * 4 + 5] = c1;
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data[off + 560 * 4 + 2] = data[off + 560 * 4 + 6] = c2;
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} else {
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data[off + 560 * 4] = data[off + 560 * 4 + 4] = c0 >> 1;
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data[off + 560 * 4 + 1] = data[off + 560 * 4 + 5] = c1 >> 1;
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data[off + 560 * 4 + 2] = data[off + 560 * 4 + 6] = c2 >> 1;
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}
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}
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function _drawHalfPixel(data, off, color) {
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var c0 = color[0], c1 = color[1], c2 = color[2];
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data[off + 0] = c0;
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data[off + 1] = c1;
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data[off + 2] = c2;
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if (!scanlines) {
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data[off + 560 * 4] = c0;
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data[off + 560 * 4 + 1] = c1;
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data[off + 560 * 4 + 2] = c2;
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} else {
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data[off + 560 * 4] = c0 >> 1;
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data[off + 560 * 4 + 1] = c1 >> 1;
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data[off + 560 * 4 + 2] = c2 >> 1;
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}
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}
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_init();
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return {
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start: function() {
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var self = this;
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window.setInterval(function() {
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self.blink();
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}, 267);
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return (0x04 * _page);
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},
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end: function() { return (0x04 * _page) + 0x03; },
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read: function(page, off) {
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var addr = (page << 8) | off,
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base = addr - 0x400 * _page;
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return _buffer[base];
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},
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write: function(page, off, val) {
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var addr = (page << 8) | off,
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base = addr - 0x400 * _page;
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if (_buffer[base] === val && !_refreshing)
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return;
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_buffer[base] = val;
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var col = (base % 0x80) % 0x28,
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adj = off - col;
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// 000001cd eabab000 -> 000abcde
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var ab = (adj & 0x18),
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cd = (page & 0x03) << 1,
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e = adj >> 7;
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var row = ab | cd | e, color, idx, jdx, b;
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if ((row < 24) && (col < 40)) {
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if (!textMode && hiresMode && !(mixedMode && row > 19))
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return;
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var data = pages[_page].data, fore, back;
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off = (col * 14 + row * 560 * 8 * 2) * 4;
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if (textMode || (mixedMode && row > 19)) {
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if (val & 0x80 || ((val & 0x40) && _blink)) {
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fore = _greenMode ? _green : _white;
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back = _black;
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} else {
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fore = _black;
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back = _greenMode ? _green : _white;
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}
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for (jdx = 0; jdx < 8; jdx++) {
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b = charset[val * 8 + jdx];
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b <<= 1;
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for (idx = 0; idx < 7; idx++) {
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color = (b & 0x80) ? fore : back;
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_drawPixel(data, off, color);
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b <<= 1;
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off += 8;
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}
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off += 546 * 4 + 560 * 4;
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}
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} else {
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if (_greenMode) {
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fore = _green;
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back = _black;
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for (jdx = 0; jdx < 8; jdx++) {
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b = (jdx < 4) ? (val & 0x0f) : (val >> 4);
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b |= (b << 4);
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b |= (b << 8);
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if ((col & 0x1) !== 0) {
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b <<= 2;
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}
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for (idx = 0; idx < 14; idx++) {
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color = (b & 0x8000) ? fore : back;
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_drawHalfPixel(data, off, color);
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b <<= 1;
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off += 4;
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}
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off += 546 * 4 + 560 * 4;
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}
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} else {
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for (jdx = 0; jdx < 8; jdx++) {
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b = (jdx < 4) ? (val & 0x0f) : (val >> 4);
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color = _colors[b];
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for (idx = 0; idx < 7; idx++) {
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_drawPixel(data, off, color);
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off += 8;
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}
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off += 546 * 4 + 560 * 4;
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}
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}
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}
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}
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},
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refresh: function() {
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var addr = 0x400 * _page;
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_refreshing = true;
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for (var idx = 0; idx < 0x400; idx++, addr++) {
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this.write(addr >> 8, addr & 0xff, _buffer[idx]);
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}
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_refreshing = false;
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},
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blink: function() {
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var addr = 0x400 * _page;
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_refreshing = true;
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_blink = !_blink;
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for (var idx = 0; idx < 0x400; idx++, addr++) {
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var b = _buffer[idx];
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if ((b & 0xC0) == 0x40) {
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this.write(addr >> 8, addr & 0xff, _buffer[idx]);
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}
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}
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_refreshing = false;
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},
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green: function(on) {
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_greenMode = on;
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this.refresh();
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},
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blit: function() {
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context.putImageData(pages[_page], 0, 0);
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},
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getState: function() {
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return {
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page: _page,
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green: _green,
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buffer: base64_encode(_buffer)
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};
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},
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setState: function(state) {
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_page = state.page;
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_green = state.green;
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_buffer = base64_decode(state.buffer);
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this.refresh();
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}
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};
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}
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function HiresPage(page)
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{
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var _page = page;
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var orangeCol = [0xff, 0x65, 0x00];
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var greenCol = [0x00, 0xff, 0x00];
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var blueCol = [0x09, 0x2a, 0xff];
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var violetCol = [0xc9, 0x39, 0xc7];
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var whiteCol = [0xff, 0xff, 0xff];
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var blackCol = [0x00, 0x00, 0x00];
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var _buffer = [];
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var _refreshing = false;
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var _green = [0x00, 0xff, 0x80];
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var _greenMode = false;
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function _init() {
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_buffer = allocMemPages(0x20);
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for (var idx = 0; idx < 0x2000; idx++)
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_buffer[idx] = 0; // Math.floor(Math.random()*256);
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}
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function _drawPixel(data, off, color) {
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var c0 = color[0], c1 = color[1], c2 = color[2];
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data[off + 0] = data[off + 4] = c0;
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data[off + 1] = data[off + 5] = c1;
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data[off + 2] = data[off + 6] = c2;
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if (!scanlines) {
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data[off + 560 * 4] = data[off + 560 * 4 + 4] = c0;
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data[off + 560 * 4 + 1] = data[off + 560 * 4 + 5] = c1;
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data[off + 560 * 4 + 2] = data[off + 560 * 4 + 6] = c2;
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} else {
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data[off + 560 * 4] = data[off + 560 * 4 + 4] = c0 >> 1;
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data[off + 560 * 4 + 1] = data[off + 560 * 4 + 5] = c1 >> 1;
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data[off + 560 * 4 + 2] = data[off + 560 * 4 + 6] = c2 >> 1;
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}
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}
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_init();
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return {
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start: function() { return (0x20 * _page); },
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end: function() { return (0x020 * _page) + 0x1f; },
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read: function(page, off) {
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var addr = (page << 8) | off,
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base = addr - 0x2000 * _page;
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return _buffer[base];
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},
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write: function(page, off, val) {
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function dim(c) {
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return [c[0] * 0.75, c[1] * 0.75, c[2] * 0.75];
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}
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var addr = (page << 8) | off,
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base = addr - 0x2000 * _page;
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if (_buffer[base] === val && !_refreshing)
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return;
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_buffer[base] = val;
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var hbs = val & 0x80;
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val &= 0x7f;
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var col = (base % 0x80) % 0x28,
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adj = off - col;
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// 000001cd eabab000 -> 000abcde
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var ab = (adj & 0x18),
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cd = (page & 0x03) << 1,
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e = adj >> 7;
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var rowa = ab | cd | e,
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rowb = base >> 10;
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if ((rowa < 24) && (col < 40)) {
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if (textMode || !hiresMode || (mixedMode && rowa > 19))
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return;
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var data = pages[_page].data,
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dy = rowa * 8 + rowb,
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dx = col * 14 - 2,
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b0 = col > 0 ? _buffer[base - 1] : 0,
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b2 = col < 39 ? _buffer[base + 1] : 0;
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val |= (b2 & 0x3) << 7;
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var v0 = b0 & 0x20, v1 = b0 & 0x40, v2 = val & 0x1,
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odd = (col & 0x1) === 0,
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color,
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oddCol = (hbs ? orangeCol : greenCol),
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evenCol = (hbs ? blueCol : violetCol);
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off = dx * 4 + dy * 560 * 4 * 2;
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for (var idx = 0; idx < 9; idx++, off += 8) {
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val >>= 1;
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if (v1) {
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if (_greenMode) {
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color = _green;
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} else if (v0 || v2) {
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color = whiteCol;
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} else {
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color = odd ? oddCol : evenCol;
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}
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} else {
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if (_greenMode) {
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color = blackCol;
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} else if (odd && v2 && v0) {
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color = v0 ? dim(evenCol) : evenCol;
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} else if (!odd && v0 && v2) {
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color = v2 ? dim(oddCol) : oddCol;
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} else {
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color = blackCol;
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}
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}
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if (dx > -1 && dx < 560) {
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_drawPixel(data, off, color);
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}
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dx += 2;
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v0 = v1;
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v1 = v2;
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v2 = val & 0x01;
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odd = !odd;
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}
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}
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},
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refresh: function() {
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var addr = 0x2000 * _page;
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_refreshing = true;
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for (var idx = 0; idx < 0x2000; idx++, addr++) {
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this.write(addr >> 8, addr & 0xff, _buffer[idx]);
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}
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_refreshing = false;
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},
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green: function(on) {
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_greenMode = on;
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this.refresh();
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},
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blit: function() {
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context.putImageData(pages[_page], 0, 0);
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},
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getState: function() {
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return {
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page: _page,
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green: _greenMode,
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buffer: base64_encode(_buffer)
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};
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},
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setState: function(state) {
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_page = state.page;
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_greenMode = state.green;
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_buffer = base64_decode(state.buffer);
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this.refresh();
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}
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};
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}
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function VideoModes(gr,hgr,gr2,hgr2) {
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var _grs = [gr, gr2];
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var _hgrs = [hgr, hgr2];
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function _refresh() {
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_grs[0].refresh();
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_grs[1].refresh();
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_hgrs[0].refresh();
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_hgrs[1].refresh();
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}
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return {
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refresh: function() {
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_refresh();
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},
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text: function(on) {
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var old = textMode;
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textMode = on;
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if (old != on) {
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_refresh();
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}
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},
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hires: function(on) {
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var old = hiresMode;
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hiresMode = on;
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if (old != on) {
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_refresh();
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}
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},
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mixed: function(on) {
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var old = mixedMode;
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mixedMode = on;
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if (old != on) {
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_refresh();
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}
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},
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page: function(pageNo) {
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pageMode = pageNo;
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},
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setContext: function(c) {
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context = c;
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pages[1] = context.createImageData(560, 384);
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pages[2] = context.createImageData(560, 384);
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for (var idx = 0; idx < 560 * 384 * 4; idx++) {
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pages[1].data[idx] = 0xff;
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pages[2].data[idx] = 0xff;
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}
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},
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blit: function() {
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if (hiresMode && !textMode) {
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_hgrs[pageMode - 1].blit();
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} else {
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_grs[pageMode - 1].blit();
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}
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},
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getState: function() {
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return {
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grs: [_grs[0].getState(), _grs[1].getState()],
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hgrs: [_hgrs[0].getState(), _hgrs[1].getState()],
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textMode: textMode,
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mixedMode: mixedMode,
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hiresMode: hiresMode,
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pageMode: pageMode
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};
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},
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setState: function(state) {
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textMode = state.textMode;
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mixedMode = state.mixedMode;
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hiresMode = state.hiresMode;
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pageMode = state.pageMode;
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_grs[0].setState(state.grs[0]);
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_grs[1].setState(state.grs[1]);
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_hgrs[0].setState(state.hgrs[0]);
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_hgrs[1].setState(state.hgrs[1]);
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},
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green: function(on) {
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_grs[0].green(on);
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_grs[1].green(on);
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_hgrs[0].green(on);
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_hgrs[1].green(on);
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}
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};
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}
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