Apple-2-Tools/apple2js
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5e4aac70d2
apple2js/js/cards/videoterm.js
Will Scullin 5e4aac70d2
Use bit math more places. (#15)
2019-11-23 19:05:52 -08:00

653 lines
26 KiB
JavaScript
Raw Blame History

/* Copyright 2017 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.
*/
import { allocMemPages, debug } from '../util';
export default function Videoterm(io, slot, context) {
slot = slot || 3;
debug('Videx Videoterm card in slot', slot);
var LOC = {
IOREG: 0x80,
IOVAL: 0x81
};
var ROM = [
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];
var VIDEO_ROM = [
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x38,0x44,0x8a,0x92,0xa2,0x44,0x38,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x08,0x38,0x08,0x08,0x08,0x08,0x3e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x3c,0x42,0x02,0x1c,0x20,0x40,0x7e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x7e,0x04,0x08,0x1c,0x02,0x42,0x3c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x04,0x0c,0x14,0x24,0x7e,0x04,0x04,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x7e,0x40,0x7c,0x02,0x02,0x42,0x3c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x1e,0x20,0x40,0x7c,0x42,0x42,0x3c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x7e,0x02,0x04,0x08,0x10,0x20,0x20,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x3c,0x42,0x42,0x3c,0x42,0x42,0x3c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x3c,0x42,0x42,0x3e,0x02,0x04,0x78,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x18,0x18,0x00,0x18,0x18,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x18,0x18,0x00,0x18,0x18,0x08,0x10,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x06,0x18,0x60,0x18,0x06,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x7e,0x00,0x7e,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x60,0x18,0x06,0x18,0x60,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x3c,0x42,0x02,0x0c,0x10,0x00,0x10,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x3c,0x42,0x9a,0xaa,0x94,0x40,0x3c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x18,0x24,0x42,0x42,0x7e,0x42,0x42,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x7c,0x42,0x42,0x7c,0x42,0x42,0x7c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x1c,0x22,0x40,0x40,0x40,0x22,0x1c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x78,0x44,0x42,0x42,0x42,0x44,0x78,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x7e,0x40,0x40,0x78,0x40,0x40,0x7e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x7e,0x40,0x40,0x78,0x40,0x40,0x40,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x1c,0x22,0x40,0x4e,0x42,0x22,0x1e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x42,0x42,0x42,0x7e,0x42,0x42,0x42,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x1c,0x08,0x08,0x08,0x08,0x08,0x1c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x0e,0x04,0x04,0x04,0x04,0x44,0x38,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x42,0x44,0x48,0x50,0x68,0x44,0x42,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x40,0x40,0x40,0x40,0x40,0x40,0x7e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x82,0xc6,0xaa,0x92,0x82,0x82,0x82,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x42,0x62,0x52,0x4a,0x46,0x42,0x42,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x38,0x44,0x82,0x82,0x82,0x44,0x38,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x7c,0x42,0x42,0x7c,0x40,0x40,0x40,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x38,0x44,0x82,0x82,0x8a,0x44,0x3a,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x7c,0x42,0x42,0x7c,0x48,0x44,0x42,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x3c,0x42,0x40,0x3c,0x02,0x42,0x3c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0xfe,0x10,0x10,0x10,0x10,0x10,0x10,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x42,0x42,0x42,0x42,0x42,0x42,0x3c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x82,0x82,0x44,0x44,0x28,0x28,0x10,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x82,0x82,0x82,0x82,0x92,0xaa,0x44,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x82,0x44,0x28,0x10,0x28,0x44,0x82,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x82,0x44,0x28,0x10,0x10,0x10,0x10,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0xfe,0x04,0x08,0x10,0x20,0x40,0xfe,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x3e,0x30,0x30,0x30,0x30,0x30,0x3e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x3e,0x06,0x06,0x06,0x06,0x06,0x3e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x08,0x1c,0x2a,0x08,0x08,0x08,0x08,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xfe,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x18,0x18,0x10,0x08,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0xf8,0x04,0x7c,0x84,0x7a,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x40,0x40,0x7c,0x42,0x42,0x42,0x7c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x3c,0x42,0x40,0x40,0x3e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x02,0x02,0x3e,0x42,0x42,0x42,0x3e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x3c,0x42,0x7e,0x40,0x3c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x1c,0x22,0x20,0x78,0x20,0x20,0x20,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x02,0x3c,0x42,0x42,0x3e,0x02,0x42,
0x3c,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x40,0x40,0x5c,0x62,0x42,0x42,0x42,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x08,0x00,0x08,0x08,0x08,0x08,0x08,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x04,0x00,0x04,0x04,0x04,0x04,0x04,0x24,
0x18,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x40,0x40,0x46,0x58,0x60,0x58,0x46,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x18,0x08,0x08,0x08,0x08,0x08,0x1c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0xec,0x92,0x92,0x92,0x92,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x5c,0x22,0x22,0x22,0x22,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x3c,0x42,0x42,0x42,0x3c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x7c,0x42,0x42,0x42,0x7c,0x40,
0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x3e,0x42,0x42,0x42,0x3e,0x02,
0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x5c,0x62,0x40,0x40,0x40,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x3e,0x40,0x3c,0x02,0x7c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x10,0x3e,0x10,0x10,0x10,0x0e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x44,0x44,0x44,0x44,0x3a,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x82,0x82,0x44,0x28,0x10,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x82,0x82,0x92,0xaa,0x44,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x42,0x24,0x18,0x24,0x42,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x82,0x82,0x44,0x28,0x10,0x20,
0xc0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x7e,0x04,0x18,0x20,0x7e,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x0c,0x10,0x08,0x30,0x08,0x10,0x0c,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x08,0x08,0x08,0x00,0x08,0x08,0x08,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x30,0x08,0x10,0x0c,0x10,0x08,0x30,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x60,0x92,0x0c,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x24,0x48,0x92,0x24,0x48,0x92,0x24,0x48,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
];
var REGS = {
CURSOR_UPPER: 0x0A,
CURSOR_LOWER: 0x0B,
STARTPOS_HI: 0x0C,
STARTPOS_LO: 0x0D,
CURSOR_HI: 0x0E,
CURSOR_LO: 0x0F,
LIGHTPEN_HI: 0x10,
LIGHTPEN_LO: 0x11
};
var CURSOR_MODES = {
SOLID: 0x00,
HIDDEN: 0x01,
BLINK: 0x10,
FAST_BLINK: 0x11
};
var _regs = [
0x7b, // 00 - Horiz. total
0x50, // 01 - Horiz. displayed
0x62, // 02 - Horiz. sync pos
0x29, // 03 - Horiz. sync width
0x1b, // 04 - Vert. total
0x08, // 05 - Vert. adjust
0x18, // 06 - Vert. displayed
0x19, // 07 - Vert. sync pos
0x00, // 08 - Interlaced
0x08, // 09 - Max. scan line
0xc0, // 0A - Cursor upper
0x08, // 0B - Cursor lower
0x00, // 0C - Startpos Hi
0x00, // 0D - Startpos Lo
0x00, // 0E - Cursor Hi
0x00, // 0F - Cursor Lo
0x00, // 10 - Lightpen Hi
0x00 // 11 - Lightpen Lo
];
var _blink = false;
var _curReg = 0;
var _startPos;
var _cursorPos;
var _shouldRefresh;
// var _cursor = 0;
var _bank = 0;
var _buffer = allocMemPages(8);
var _imageData;
var _dirty = false;
var _black = [0x00, 0x00, 0x00];
var _white = [0xff, 0xff, 0xff];
function _init() {
var idx;
_imageData = context.createImageData(560, 384);
for (idx = 0; idx < 560 * 384 * 4; idx++) {
_imageData.data[idx] = 0xff;
}
for (idx = 0; idx < 0x800; idx++) {
_buffer[idx] = idx & 0xff;
}
_refresh();
setInterval(function() {
_blink = !_blink;
_refreshCursor();
}, 300);
}
function _updateBuffer(addr, val) {
_buffer[addr] = val;
val &= 0x7f; // XXX temp
var saddr = (0x800 + addr - _startPos) & 0x7ff;
var data = _imageData.data;
var row = (saddr / 80) & 0xff;
var col = saddr % 80;
var x = col * 7;
var y = row << 4;
var c = val << 4;
var color;
if (row < 25) {
_dirty = true;
for (var idx = 0; idx < 8; idx++) {
var cdata = VIDEO_ROM[c + idx];
for (var jdx = 0; jdx < 7; jdx++) {
if (cdata & 0x80) {
color = _white;
} else {
color = _black;
}
data[(y + idx * 2) * 560 * 4 + (x + jdx) * 4] = color[0];
data[(y + idx * 2) * 560 * 4 + (x + jdx) * 4 + 1] = color[1];
data[(y + idx * 2) * 560 * 4 + (x + jdx) * 4 + 2] = color[2];
data[(y + idx * 2 + 1) * 560 * 4 + (x + jdx) * 4] = color[0];
data[(y + idx * 2 + 1) * 560 * 4 + (x + jdx) * 4 + 1] = color[1];
data[(y + idx * 2 + 1) * 560 * 4 + (x + jdx) * 4 + 2] = color[2];
cdata <<= 1;
}
}
}
}
function _refreshCursor(fromRegs) {
var addr = _regs[REGS.CURSOR_HI] << 8 | _regs[REGS.CURSOR_LO];
var saddr = (0x800 + addr - _startPos) & 0x7ff;
var data = _imageData.data;
var row = (saddr / 80) & 0xff;
var col = saddr % 80;
var x = col * 7;
var y = row * 16;
var blinkmode = (_regs[REGS.CURSOR_UPPER] & 0x60) >> 5;
if (fromRegs) {
if (addr !== _cursorPos) {
var caddr = (0x800 + _cursorPos - _startPos) & 0x7ff;
_updateBuffer(caddr, _buffer[caddr]);
_cursorPos = addr;
}
}
_updateBuffer(addr, _buffer[addr]);
if (blinkmode === CURSOR_MODES.HIDDEN) {
return;
}
if (_blink || (blinkmode === CURSOR_MODES.SOLID)) {
_dirty = true;
for (var idx = 0; idx < 8; idx++) {
var color = _white;
if (idx >= (_regs[REGS.CURSOR_UPPER] & 0x1f) &&
idx <= (_regs[REGS.CURSOR_LOWER] & 0x1f)) {
for (var jdx = 0; jdx < 7; jdx++) {
data[(y + idx * 2) * 560 * 4 + (x + jdx) * 4] = color[0];
data[(y + idx * 2) * 560 * 4 + (x + jdx) * 4 + 1] = color[1];
data[(y + idx * 2) * 560 * 4 + (x + jdx) * 4 + 2] = color[2];
data[(y + idx * 2 + 1) * 560 * 4 + (x + jdx) * 4] = color[0];
data[(y + idx * 2 + 1) * 560 * 4 + (x + jdx) * 4 + 1] = color[1];
data[(y + idx * 2 + 1) * 560 * 4 + (x + jdx) * 4 + 2] = color[2];
}
}
}
}
}
function _updateStartPos() {
var startPos =
_regs[REGS.STARTPOS_HI] << 8 |
_regs[REGS.STARTPOS_LO];
if (_startPos != startPos) {
_startPos = startPos;
_shouldRefresh = true;
}
}
function _refresh() {
for (var idx = 0; idx < 0x800; idx++) {
_updateBuffer(idx, _buffer[idx]);
}
}
function _access(off, val) {
var writeMode = val !== undefined;
var result = undefined;
switch (off & 0x81) {
case LOC.IOREG:
if (writeMode) {
_curReg = val;
} else {
result = _curReg;
}
break;
case LOC.IOVAL:
if (writeMode) {
_regs[_curReg] = val;
switch (_curReg) {
case REGS.CURSOR_UPPER:
case REGS.CURSOR_LOWER:
_refreshCursor(true);
break;
case REGS.CURSOR_HI:
case REGS.CURSOR_LO:
_refreshCursor(true);
break;
case REGS.STARTPOS_HI:
case REGS.STARTPOS_LO:
_updateStartPos();
break;
}
} else {
result = _regs[_curReg];
}
break;
}
_bank = (off & 0x0C) >> 2;
return result;
}
_init();
return {
ioSwitch: function (off, val) {
return _access(off, val);
},
read: function(page, off) {
if (page < 0xcc) {
return ROM[(page & 0x03) << 8 | off];
} else if (page < 0xce){
var addr = ((page & 0x01) + (_bank << 1)) << 8 | off;
return _buffer[addr];
}
},
write: function(page, off, val) {
if (page > 0xcb && page < 0xce) {
var addr = ((page & 0x01) + (_bank << 1)) << 8 | off;
_updateBuffer(addr, val);
}
},
blit: function() {
if (_shouldRefresh) {
_refresh();
_shouldRefresh = false;
}
if (_dirty) {
context.putImageData(_imageData, 0, 0);
_dirty = false;
return true;
}
return false;
}
};
}
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