apple2js/js/canvas2e.js

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/* -*- mode: JavaScript; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Copyright 2010-2013 Will Scullin <scullin@scullinsteel.com>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
/*globals allocMemPages: false, charset: false, base64_encode: false, base64_decode: false */
/*exported LoresPage, HiresPage, VideoModes */
var GREEN = [0x00,0xff,0x00];
// var WHITE = [0xff,0xff,0xff];
var MONO = GREEN;
var textMode = true;
var mixedMode = false;
var hiresMode = false;
var pageMode = 1;
var _80colMode = false;
var altCharMode = false;
var doubleHiresMode = false;
var pages = [];
var context = null;
/****************************************************************************
*
* Text/Lores Graphics
*
***************************************************************************/
function LoresPage(page)
{
// $00-$3F inverse
// $40-$7F flashing
// $80-$FF normal
var _page = page;
var _buffer = [];
var _refreshing = false;
var _greenMode = false;
var _blink = false;
var _black = [0x00,0x00,0x00];
var _white = [0xff,0xff,0xff];
var _green = [0x00,0xff,0x00];
var _colors = [
[0x00,0x00,0x00], // 0 Black 0000 0 0
[0x90,0x17,0x40], // 1 Red 0001 8 1
[0x3c,0x22,0xa5], // 2 Dark Blue 1000 1
[0xd0,0x43,0xe5], // 3 Purple 1001 9
[0x00,0x69,0x40], // 4 Dark Green 0100 4
[0xb0,0xb0,0xb0], // 5 Gray 1 0101 5
[0x2f,0x95,0xe5], // 6 Medium Blue 1100 12
[0xbf,0xab,0xff], // 7 Light Blue 1101 13
[0x40,0x54,0x00], // 8 Brown 0010 2
[0xd0,0x6a,0x1a], // 9 Orange 0011 3
[0x40,0x40,0x40], // 10 Gray 2 1010 10
[0xff,0x96,0xbf], // 11 Pink 1011 11
[0x2f,0xbc,0x1a], // 12 Light Green 0110 6
[0xb9,0xd0,0x60], // 13 Yellow 0111 7
[0x6f,0xe8,0xbf], // 14 Aqua 1110 14
[0xff,0xff,0xff] // 15 White 1111 15
];
function _init() {
_buffer[0] = allocMemPages(0x4);
_buffer[1] = allocMemPages(0x4);
for (var idx = 0; idx < 0x400; idx++) {
_buffer[0][idx] = 0; // idx & 0x2 ? 0xff : 0x00;
_buffer[1][idx] = 0; // idx & 0x2 ? 0xff : 0x00;
}
}
_init();
return {
start: function() {
var self = this;
window.setInterval(function() {
self.blink();
}, 267);
},
bank0: function() {
var self = this;
return {
start: function() {
return self._start();
},
end: function() {
return self._end();
},
read: function(page, off) {
return self._read(page, off, 0);
},
write: function(page, off, val) {
return self._write(page, off, val, 0);
}
};
},
bank1: function() {
var self = this;
return {
start: function() {
return self._start();
},
end: function() {
return self._end();
},
read: function(page, off) {
return self._read(page, off, 1);
},
write: function(page, off, val) {
return self._write(page, off, val, 1);
}
};
},
// These are used by both bank 0 and 1
_start: function() {
return (0x04 * _page);
},
_end: function() { return (0x04 * _page) + 0x03; },
_read: function(page, off, bank) {
var addr = (page << 8) | off,
base = addr - 0x400 * _page;
return _buffer[bank][base];
},
_write: function(page, off, val, bank) {
var addr = (page << 8) | off,
base = addr - 0x400 * _page,
fore, back;
if (_buffer[bank][base] == val && !_refreshing)
return;
_buffer[bank][base] = val;
if (bank !== 0 && !_80colMode)
return;
var col = (base % 0x80) % 0x28,
adj = off - col;
// 000001cd eabab000 -> 000abcde
var ab = (adj & 0x18),
cd = (page & 0x03) << 1,
e = adj >> 7;
var idx, jdx;
var row = ab | cd | e;
var data = pages[_page].data;
if ((row < 24) && (col < 40)) {
if (!textMode && hiresMode && !(mixedMode && row > 19))
return;
var color;
if (textMode || (mixedMode && row > 19)) {
var b;
var flash = ((val & 0xc0) == 0x40) &&
_blink && !_80colMode;
fore = flash ? _black : (_greenMode ? _green : _white);
back = flash ? _white : _black;
if (!altCharMode && !_80colMode) {
val = (val >= 0x40 && val < 0x80) ? val - 0x40 : val;
}
if (_80colMode) {
off = (col * 14 + (bank ? 0 : 1) * 7 + row * 560 * 8) * 4;
for (jdx = 0; jdx < 8; jdx++) {
b = charset[val * 8 + jdx];
for (idx = 0; idx < 7; idx++) {
color = (b & 0x01) ? back : fore;
data[off + 0] = color[0];
data[off + 1] = color[1];
data[off + 2] = color[2];
b >>= 1;
off += 4;
}
off += 553 * 4;
}
} else {
off = (col * 14 + row * 560 * 8) * 4;
for (jdx = 0; jdx < 8; jdx++) {
b = charset[val * 8 + jdx];
for (idx = 0; idx < 7; idx++) {
color = (b & 0x01) ? back : fore;
data[off + 0] = color[0];
data[off + 1] = color[1];
data[off + 2] = color[2];
data[off + 4] = color[0];
data[off + 5] = color[1];
data[off + 6] = color[2];
b >>= 1;
off += 8;
}
off += 546 * 4;
}
}
} else {
if (_80colMode) {
off = (col * 14 + (bank ? 0 : 1) * 7 + row * 560 * 8) * 4;
for (jdx = 0; jdx < 8; jdx++) {
color = _colors[(jdx < 4) ?
(val & 0x0f) : (val >> 4)];
for (idx = 0; idx < 7; idx++) {
data[off + 0] = color[0];
data[off + 1] = color[1];
data[off + 2] = color[2];
off += 4;
}
off += 553 * 4;
}
} else {
off = (col * 14 + row * 560 * 8) * 4;
for (jdx = 0; jdx < 8; jdx++) {
color = _colors[(jdx < 4) ?
(val & 0x0f) : (val >> 4)];
for (idx = 0; idx < 7; idx++) {
data[off + 0] = color[0];
data[off + 1] = color[1];
data[off + 2] = color[2];
data[off + 4] = color[0];
data[off + 5] = color[1];
data[off + 6] = color[2];
off += 8;
}
off += 546 * 4;
}
}
}
}
},
refresh: function() {
var page, off, addr = 0x400 * _page;
_refreshing = true;
for (var idx = 0; idx < 0x400; idx++, addr++) {
page = addr >> 8;
off = addr & 0xff;
this._write(addr >> 8, addr & 0xff, _buffer[0][idx], 0);
if (_80colMode)
this._write(addr >> 8, addr & 0xff, _buffer[1][idx], 1);
}
_refreshing = false;
},
blink: function() {
var addr = 0x400 * _page;
_refreshing = true;
_blink = !_blink;
for (var idx = 0; idx < 0x400; idx++, addr++) {
var b = _buffer[0][idx];
if ((b & 0xC0) == 0x40) {
this._write(addr >> 8, addr & 0xff, _buffer[0][idx], 0);
}
}
_refreshing = false;
},
green: function(on) {
_greenMode = on;
},
blit: function() {
context.putImageData(pages[_page], 0, 0);
},
getState: function() {
return {
page: _page,
green: _green,
buffer: [base64_encode(_buffer[0]),
base64_encode(_buffer[1])]
};
},
setState: function(state) {
_page = state.page;
_green = state.green;
_buffer[0] = base64_decode(state.buffer[0]);
_buffer[1] = base64_decode(state.buffer[1]);
this.refresh();
}
};
}
/****************************************************************************
*
* Hires Graphics
*
***************************************************************************/
function HiresPage(page)
{
var _page = page;
var r4 = [0, // Black
2, // Dark Blue
4, // Dark Green
6, // Medium Blue
8, // Brown
5, // Gray 1
12, // Light Green
14, // Aqua
1, // Red
3, // Purple
10, // Gray 2
7, // Pink
9, // Orange
11, // Light Blue
13, // Yellow
15]; // White
var dcolors = [
[0x00,0x00,0x00], // 0 Black 0000 0 0
[0x90,0x17,0x40], // 1 Red 0001 8 1
[0x3c,0x22,0xa5], // 2 Dark Blue 1000 1
[0xd0,0x43,0xe5], // 3 Purple 1001 9
[0x00,0x69,0x40], // 4 Dark Green 0100 4
[0xb0,0xb0,0xb0], // 5 Gray 1 0101 5
[0x2f,0x95,0xe5], // 6 Medium Blue 1100 12
[0xbf,0xab,0xff], // 7 Light Blue 1101 13
[0x40,0x54,0x00], // 8 Brown 0010 2
[0xd0,0x6a,0x1a], // 9 Orange 0011 3
[0x40,0x40,0x40], // 10 Gray 2 1010 10
[0xff,0x96,0xbf], // 11 Pink 1011 11
[0x2f,0xbc,0x1a], // 12 Light Green 0110 6
[0xb9,0xd0,0x60], // 13 Yellow 0111 7
[0x6f,0xe8,0xbf], // 14 Aqua 1110 14
[0xff,0xff,0xff] // 15 White 1111 15
];
// hires colors
var orangeCol = [0xff, 0x65, 0x00];
var greenCol = [0x00, 0xff, 0x00];
var blueCol = [0x09, 0x2a, 0xff];
var violetCol = [0xc9, 0x39, 0xc7];
var whiteCol = [0xff, 0xff, 0xff];
var blackCol = [0x00, 0x00, 0x00];
var _buffer = [];
var _refreshing = false;
var _green = false;
var _garish = false;
function _init() {
_buffer[0] = allocMemPages(0x20);
_buffer[1] = allocMemPages(0x20);
for (var idx = 0; idx < 0x2000; idx++) {
_buffer[0][idx] = 0; // idx & 0x2 ? 0xff : 0x00;
_buffer[1][idx] = 0; // idx & 0x2 ? 0xff : 0x00;
}
}
_init();
return {
bank0: function() {
var self = this;
return {
start: function() {
return self._start();
},
end: function() {
return self._end();
},
read: function(page, off) {
return self._read(page, off, 0);
},
write: function(page, off, val) {
return self._write(page, off, val, 0);
}
};
},
bank1: function() {
var self = this;
return {
start: function() {
return self._start();
},
end: function() {
return self._end();
},
read: function(page, off) {
return self._read(page, off, 1);
},
write: function(page, off, val) {
return self._write(page, off, val, 1);
}
};
},
_start: function() { return (0x20 * _page); },
_end: function() { return (0x020 * _page) + 0x1f; },
_read: function(page, off, bank) {
var addr = (page << 8) | off, base = addr - 0x2000 * _page;
return _buffer[bank][base];
},
_write: function(page, off, val, bank) {
var addr = (page << 8) | off, base = addr - 0x2000 * _page,
idx, jdx;
if (_buffer[bank][base] == val && !_refreshing)
return;
_buffer[bank][base] = val;
if (bank !== 0 && !doubleHiresMode)
return;
var hbs = val & 0x80;
val &= 0x7f;
var col = (base % 0x80) % 0x28,
adj = off - col;
// 000001cd eabab000 -> 000abcde
var ab = (adj & 0x18),
cd = (page & 0x03) << 1,
e = adj >> 7;
var rowa = ab | cd | e,
rowb = base >> 10;
var dx, dy, data = pages[_page].data;
if ((rowa < 24) && (col < 40)) {
if (textMode || !hiresMode || (mixedMode && rowa > 19))
return;
dy = rowa * 16 + rowb * 2;
var b0, b1, b2, b3, b4, c;
if (doubleHiresMode) {
// Every 4 bytes is 7 pixels
// 2 bytes per bank
var mod = col % 2, mcol = col - mod;
b0 = _buffer[1][base - mod];
b1 = _buffer[0][base - mod];
b2 = _buffer[1][base - mod + 1];
b3 = _buffer[0][base - mod + 1];
b4 = _buffer[1][base - mod + 2];
c = [((b0 & 0x0f) >> 0), // 0
((b0 & 0x70) >> 4) | ((b1 & 0x01) << 3), // 1
((b1 & 0x1e) >> 1), // 2
((b1 & 0x60) >> 5) | ((b2 & 0x03) << 2), // 3
((b2 & 0x3c) >> 2), // 4
((b2 & 0x40) >> 6) | ((b3 & 0x07) << 1), // 5
((b3 & 0x78) >> 3), // 6
0]; // 7
if (col < 39) {
c[7] = b4 & 0x0f;
}
dx = mcol * 14;
off = dx * 4 + dy * 280 * 4;
for (idx = 0; idx < 7; idx++) {
var dcolor = _green ? MONO : dcolors[r4[c[idx]]];
var bits = c[idx] | (c[idx + 1] << 4);
for (jdx = 0; jdx < 4; jdx++, off += 4) {
var saturate = !MONO && (_garish || bits & 0xe);
if (bits & 0x1 || saturate) {
data[off + 0] = dcolor[0];
data[off + 1] = dcolor[1];
data[off + 2] = dcolor[2];
} else {
data[off + 0] = 0; // dcolor[0] >> 1;
data[off + 1] = 0; // dcolor[1] >> 1;
data[off + 2] = 0; // dcolor[2] >> 1;
}
bits >>= 1;
}
}
} else {
dx = col * 14 - 2;
b0 = col > 0 ? _buffer[bank][base - 1] : 0;
b2 = col < 39 ? _buffer[bank][base + 1] : 0;
val |= (b2 & 0x3) << 7;
var v0 = b0 & 0x20, v1 = b0 & 0x40, v2 = val & 0x1,
odd = !(col & 0x1), color,
oddCol = (hbs ? orangeCol : greenCol),
evenCol = (hbs ? blueCol : violetCol);
off = dx * 4 + dy * 280 * 4;
for (idx = 0; idx < 9; idx++, off += 8) {
val >>= 1;
if (v1) {
if (_green) {
color = MONO;
} else if (v0 || v2) {
color = whiteCol;
} else {
color = odd ? oddCol : evenCol;
}
} else {
if (_green) {
color = blackCol;
} else if (odd && v2 && (_garish || v0)) {
color = evenCol;
} else if (!odd && v0 && (_garish || v2)) {
color = oddCol;
} else {
color = blackCol;
}
}
if (dx > -1 && dx < 560) {
data[off + 0] = color[0];
data[off + 1] = color[1];
data[off + 2] = color[2];
data[off + 4] = color[0];
data[off + 5] = color[1];
data[off + 6] = color[2];
}
dx += 2;
v0 = v1;
v1 = v2;
v2 = val & 0x01;
odd = !odd;
}
}
}
},
refresh: function() {
var page, off, idx, addr = 0x2000 * _page;
_refreshing = true;
for (idx = 0; idx < 0x2000; idx++, addr++) {
page = addr >> 8;
off = addr & 0xff;
this._write(page, off, _buffer[0][idx], 0);
if (_80colMode)
this._write(page, off, _buffer[1][idx], 1);
}
_refreshing = false;
},
green: function(on) {
_green = on;
this.refresh();
},
garish: function(on) {
_garish = on;
this.refresh();
},
blit: function() {
context.putImageData(pages[_page], 0, 0);
},
getState: function() {
return {
page: _page,
green: _green,
garish: _garish,
buffer: [base64_encode(_buffer[0]),
base64_encode(_buffer[1])]
};
},
setState: function(state) {
_page = state.page;
_green = state.green;
_garish = state.garish;
_buffer[0] = base64_decode(state.buffer[0]);
_buffer[1] = base64_decode(state.buffer[1]);
this.refresh();
}
};
}
function VideoModes(gr,hgr,gr2,hgr2) {
var _grs = [gr, gr2];
var _hgrs = [hgr, hgr2];
function _refresh() {
gr.refresh();
gr2.refresh();
hgr.refresh();
hgr2.refresh();
}
return {
refresh: function() {
_refresh();
},
reset: function() {
textMode = true;
mixedMode = false;
hiresMode = true;
pageMode = 1;
_80colMode = false;
altCharMode = false;
doubleHiresMode = false;
_refresh();
},
text: function(on) {
var old = textMode;
textMode = on;
if (old != on) {
_refresh();
}
},
_80col: function(on) {
var old = _80colMode;
_80colMode = on;
if (old != on) {
_refresh();
}
},
altchar: function(on) {
var old = altCharMode;
altCharMode = on;
if (old != on) {
_refresh();
}
},
hires: function(on) {
var old = hiresMode;
hiresMode = on;
if (old != on) {
_refresh();
}
},
doublehires: function(on) {
var old = doubleHiresMode;
doubleHiresMode = on;
if (old != on) {
if (on) {
this.page(1);
}
_refresh();
}
},
mixed: function(on) {
var old = mixedMode;
mixedMode = on;
if (old != on) {
_refresh();
}
},
page: function(pageNo) {
pageMode = pageNo;
},
isText: function() {
return textMode;
},
isMixed: function() {
return mixedMode;
},
isPage2: function() {
return pageMode == 2;
},
isHires: function() {
return hiresMode;
},
is80Col: function() {
return _80colMode;
},
isAltChar: function() {
return altCharMode;
},
setContext: function(c) {
context = c;
pages[1] = c.createImageData(560, 192);
pages[2] = c.createImageData(560, 192);
for (var idx = 0; idx < 560 * 192 * 4; idx++) {
pages[1].data[idx] = 0xff;
pages[2].data[idx] = 0xff;
}
},
blit: function() {
if (hiresMode && !textMode) {
_hgrs[pageMode - 1].blit();
} else {
_grs[pageMode - 1].blit();
}
},
getState: function() {
return {
grs: [_grs[0].getState(), _grs[1].getState()],
hgrs: [_hgrs[0].getState(), _hgrs[1].getState()],
textMode: textMode,
mixedMode: mixedMode,
hiresMode: hiresMode,
pageMode: pageMode,
_80colMode: _80colMode,
altCharMode: altCharMode,
doubleHiresMode: doubleHiresMode
};
},
setState: function(state) {
textMode = state.textMode;
mixedMode = state.mixedMode;
hiresMode = state.hiresMode;
pageMode = state.pageMode;
_80colMode = state._80colMode;
altCharMode = state.altCharMode;
doubleHiresMode = state.doubleHiresMode;
_grs[0].setState(state.grs[0]);
_grs[1].setState(state.grs[1]);
_hgrs[0].setState(state.hgrs[0]);
_hgrs[1].setState(state.hgrs[1]);
},
green: function(on) {
_grs[0].green(on);
_grs[1].green(on);
_hgrs[0].green(on);
_hgrs[1].green(on);
},
garish: function(on) {
_hgrs[0].garish(on);
_hgrs[1].garish(on);
}
};
}