apple2js/js/gl.ts

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/* Copyright 2010-2021 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 { byte, Color, memory, MemoryPages, rom } from './types';
import { allocMemPages } from './util';
import { screenEmu } from 'apple2shader';
import {
GraphicsState,
HiresPage,
LoresPage,
Region,
VideoModes,
VideoModesState,
bank,
pageNo
} from './videomodes';
// Color constants
const whiteCol: Color = [255, 255, 255];
const blackCol: Color = [0, 0, 0];
const notDirty: Region = {
top: 193,
bottom: -1,
left: 561,
right: -1
};
/****************************************************************************
*
* Text/Lores Graphics
*
***************************************************************************/
export class LoresPageGL implements LoresPage {
// $00-$3F inverse
// $40-$7F flashing
// $80-$FF normal
private _buffer: memory[] = [];
private _refreshing = false;
private _blink = false;
dirty: Region = {...notDirty}
imageData: ImageData;
constructor(
private vm: VideoModes,
private page: pageNo,
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private readonly charset: rom,
private readonly e: boolean
) {
this.imageData = this.vm.context.createImageData(560, 192);
this.imageData.data.fill(0xff);
this._buffer[0] = allocMemPages(0x4);
this._buffer[1] = allocMemPages(0x4);
this.vm.setLoresPage(page, this);
}
private _drawPixel(data: Uint8ClampedArray, off: number, color: Color) {
const c0 = color[0], c1 = color[1], c2 = color[2];
data[off + 0] = data[off + 4] = c0;
data[off + 1] = data[off + 5] = c1;
data[off + 2] = data[off + 6] = c2;
}
private _drawHalfPixel(data: Uint8ClampedArray, off: number, color: Color) {
const c0 = color[0], c1 = color[1], c2 = color[2];
data[off + 0] = c0;
data[off + 1] = c1;
data[off + 2] = c2;
}
private _checkInverse(val: byte) {
let inverse = false;
if (this.e) {
if (!this.vm._80colMode && !this.vm.altCharMode) {
inverse = ((val & 0xc0) == 0x40) && this._blink;
}
} else {
inverse = !((val & 0x80) || (val & 0x40) && this._blink);
}
return inverse;
}
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bank0(): MemoryPages {
return {
start: () => this._start(),
end: () => this._end(),
read: (page, off) => this._read(page, off, 0),
write: (page, off, val) => this._write(page, off, val, 0),
};
}
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bank1(): MemoryPages {
return {
start: () => this._start(),
end: () => this._end(),
read: (page, off) => this._read(page, off, 1),
write: (page, off, val) => this._write(page, off, val, 1),
};
}
// These are used by both bank 0 and 1
private _start() {
return (0x04 * this.page);
}
private _end() { return (0x04 * this.page) + 0x03; }
private _read(page: byte, off: byte, bank: bank) {
const addr = (page << 8) | off, base = addr & 0x3FF;
return this._buffer[bank][base];
}
private _write(page: byte, off: byte, val: byte, bank: bank) {
const addr = (page << 8) | off;
const base = addr & 0x3FF;
let fore, back;
if (this._buffer[bank][base] == val && !this._refreshing) {
return;
}
this._buffer[bank][base] = val;
const col = (base % 0x80) % 0x28;
const adj = off - col;
// 000001cd eabab000 -> 000abcde
const ab = (adj & 0x18);
const cd = (page & 0x03) << 1;
const ee = adj >> 7;
const row = ab | cd | ee;
const data = this.imageData.data;
if ((row < 24) && (col < 40)) {
let y = row << 3;
if (y < this.dirty.top) { this.dirty.top = y; }
y += 8;
if (y > this.dirty.bottom) { this.dirty.bottom = y; }
let x = col * 14;
if (x < this.dirty.left) { this.dirty.left = x; }
x += 14;
if (x > this.dirty.right) { this.dirty.right = x; }
if (this.vm.textMode || this.vm.hiresMode || (this.vm.mixedMode && row > 19)) {
if (this.vm._80colMode) {
const inverse = this._checkInverse(val);
fore = inverse ? blackCol : whiteCol;
back = inverse ? whiteCol : blackCol;
if (!this.vm.altCharMode) {
val = (val >= 0x40 && val < 0x80) ? val - 0x40 : val;
}
let offset = (col * 14 + (bank ? 0 : 1) * 7 + row * 560 * 8) * 4;
for (let jdx = 0; jdx < 8; jdx++) {
let b = this.charset[val * 8 + jdx];
for (let idx = 0; idx < 7; idx++) {
const color = (b & 0x01) ? back : fore;
this._drawHalfPixel(data, offset, color);
b >>= 1;
offset += 4;
}
offset += 553 * 4;
}
} else if (bank === 0) {
val = this._buffer[0][base];
const inverse = this._checkInverse(val);
fore = inverse ? blackCol : whiteCol;
back = inverse ? whiteCol : blackCol;
if (!this.vm.altCharMode) {
val = (val >= 0x40 && val < 0x80) ? val - 0x40 : val;
}
let offset = (col * 14 + row * 560 * 8) * 4;
if (this.e) {
for (let jdx = 0; jdx < 8; jdx++) {
let b = this.charset[val * 8 + jdx];
for (let idx = 0; idx < 7; idx++) {
const color = (b & 0x01) ? back : fore;
this._drawPixel(data, offset, color);
b >>= 1;
offset += 8;
}
offset += 546 * 4;
}
} else {
for (let jdx = 0; jdx < 8; jdx++) {
let b = this.charset[val * 8 + jdx] << 1;
for (let idx = 0; idx < 7; idx++) {
const color = (b & 0x80) ? fore : back;
this._drawPixel(data, offset, color);
b <<= 1;
offset += 8;
}
offset += 546 * 4;
}
}
}
} else {
if (this.vm._80colMode && !this.vm.an3State) {
let offset = (col * 14 + (bank ? 0 : 1) * 7 + row * 560 * 8) * 4;
for (let jdx = 0; jdx < 8; jdx++) {
let b = (jdx < 4) ? (val & 0x0f) : (val >> 4);
b |= (b << 4);
b |= (b << 8);
if (col & 0x1) {
b >>= 2;
}
for (let idx = 0; idx < 7; idx++) {
const color = (b & 0x01) ? whiteCol : blackCol;
this._drawHalfPixel(data, offset, color);
b >>= 1;
offset += 4;
}
offset += 553 * 4;
}
} else if (bank === 0) {
let offset = (col * 14 + row * 560 * 8) * 4;
for (let jdx = 0; jdx < 8; jdx++) {
let b = (jdx < 4) ? (val & 0x0f) : (val >> 4);
b |= (b << 4);
b |= (b << 8);
if (col & 0x1) {
b >>= 2;
}
for (let idx = 0; idx < 14; idx++) {
const color = (b & 0x0001) ? whiteCol : blackCol;
this._drawHalfPixel(data, offset, color);
b >>= 1;
offset += 4;
}
offset += 546 * 4;
}
}
}
}
}
refresh() {
let addr = 0x400 * this.page;
this._refreshing = true;
for (let idx = 0; idx < 0x400; idx++, addr++) {
this._write(addr >> 8, addr & 0xff, this._buffer[0][idx], 0);
if (this.vm._80colMode) {
this._write(addr >> 8, addr & 0xff, this._buffer[1][idx], 1);
}
}
this._refreshing = false;
}
blink() {
let addr = 0x400 * this.page;
this._refreshing = true;
this._blink = !this._blink;
for (let idx = 0; idx < 0x400; idx++, addr++) {
const b = this._buffer[0][idx];
if ((b & 0xC0) == 0x40) {
this._write(addr >> 8, addr & 0xff, this._buffer[0][idx], 0);
}
}
this._refreshing = false;
}
start() {
setInterval(() => this.blink(), 267);
return this._start();
}
end() {
return this._end();
}
read(page: byte, off: byte) {
return this._read(page, off, 0);
}
write(page: byte, off: byte, val: byte) {
return this._write(page, off, val, 0);
}
getState(): GraphicsState {
return {
buffer: [
new Uint8Array(this._buffer[0]),
new Uint8Array(this._buffer[1]),
]
};
}
setState(state: GraphicsState) {
this._buffer[0] = new Uint8Array(state.buffer[0]);
this._buffer[1] = new Uint8Array(state.buffer[1]);
this.refresh();
}
private rowToBase(row: number) {
const ab = (row >> 3) & 3;
const cd = (row >> 1) & 0x3;
const e = row & 1;
return (cd << 8) | (e << 7) | (ab << 5) | (ab << 3);
}
private mapCharCode(charCode: byte) {
charCode &= 0x7F;
if (charCode < 0x20) {
charCode += 0x40;
}
if (!this.e && (charCode >= 0x60)) {
charCode -= 0x40;
}
return charCode;
}
getText() {
let buffer = '', line, charCode;
let row, col, base;
for (row = 0; row < 24; row++) {
base = this.rowToBase(row);
line = '';
if (this.e && this.vm._80colMode) {
for (col = 0; col < 80; col++) {
charCode = this.mapCharCode(this._buffer[1 - col % 2][base + Math.floor(col / 2)]);
line += String.fromCharCode(charCode);
}
} else {
for (col = 0; col < 40; col++) {
charCode = this.mapCharCode(this._buffer[0][base + col]);
line += String.fromCharCode(charCode);
}
}
line = line.trimRight();
buffer += line + '\n';
}
return buffer;
}
}
/****************************************************************************
*
* Hires Graphics
*
***************************************************************************/
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export class HiresPageGL implements HiresPage {
public imageData: ImageData;
dirty: Region = {...notDirty};
private _buffer: memory[] = [];
private _refreshing = false;
constructor(
private vm: VideoModes,
private page: pageNo,
) {
this.imageData = this.vm.context.createImageData(560, 192);
this.imageData.data.fill(0xff);
this._buffer[0] = allocMemPages(0x20);
this._buffer[1] = allocMemPages(0x20);
this.vm.setHiresPage(page, this);
}
private _drawPixel(data: Uint8ClampedArray, off: number, color: Color) {
const c0 = color[0], c1 = color[1], c2 = color[2];
data[off + 0] = data[off + 4] = c0;
data[off + 1] = data[off + 5] = c1;
data[off + 2] = data[off + 6] = c2;
}
private _drawHalfPixel(data: Uint8ClampedArray, off: number, color: Color) {
const c0 = color[0], c1 = color[1], c2 = color[2];
data[off + 0] = c0;
data[off + 1] = c1;
data[off + 2] = c2;
}
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bank0(): MemoryPages {
return {
start: () => this._start(),
end: () => this._end(),
read: (page, off) => this._read(page, off, 0),
write: (page, off, val) => this._write(page, off, val, 0),
};
}
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bank1(): MemoryPages {
return {
start: () => this._start(),
end: () => this._end(),
read: (page, off) => this._read(page, off, 1),
write: (page, off, val) => this._write(page, off, val, 1),
};
}
private _start() { return (0x20 * this.page); }
private _end() { return (0x020 * this.page) + 0x1f; }
private _read(page: byte, off: byte, bank: bank) {
const addr = (page << 8) | off, base = addr & 0x1FFF;
return this._buffer[bank][base];
}
private _write(page: byte, off: byte, val: byte, bank: bank) {
const addr = (page << 8) | off;
const base = addr & 0x1FFF;
if (this._buffer[bank][base] == val && !this._refreshing) {
return;
}
this._buffer[bank][base] = val;
const col = (base % 0x80) % 0x28;
const adj = off - col;
// 000001cd eabab000 -> 000abcde
const ab = (adj & 0x18);
const cd = (page & 0x03) << 1;
const e = adj >> 7;
const rowa = ab | cd | e,
rowb = base >> 10;
const data = this.imageData.data;
if ((rowa < 24) && (col < 40) && this.vm.hiresMode) {
let y = rowa << 3 | rowb;
if (y < this.dirty.top) { this.dirty.top = y; }
y += 1;
if (y > this.dirty.bottom) { this.dirty.bottom = y; }
let x = col * 14 - 2;
if (x < this.dirty.left) { this.dirty.left = x; }
x += 14;
if (x > this.dirty.right) { this.dirty.right = x; }
const dy = rowa << 3 | rowb;
if (this.vm.doubleHiresMode) {
const dx = col * 14 + (bank ? 0 : 7);
let offset = dx * 4 + dy * 280 * 4 * 2;
let bits = val;
for (let jdx = 0; jdx < 7; jdx++, offset += 4) {
if (bits & 0x01) {
this._drawHalfPixel(data, offset, whiteCol);
} else {
this._drawHalfPixel(data, offset, blackCol);
}
bits >>= 1;
}
} else if (bank === 0) {
const hbs = val & 0x80;
const lastCol = col === 39;
const cropLastPixel = hbs && lastCol;
const dx = col * 14;
let offset = dx * 4 + dy * 560 * 4;
if (hbs) {
const val0 = this._buffer[bank][base - 1] || 0;
if (val0 & 0x40) {
this._drawHalfPixel(data, offset, whiteCol);
} else {
this._drawHalfPixel(data, offset, blackCol);
}
offset += 4;
}
let bits = val;
for (let idx = 0; idx < 7; idx++, offset += 8) {
const drawPixel = cropLastPixel && idx == 6
? this._drawHalfPixel
: this._drawPixel;
if (bits & 0x01) {
drawPixel(data, offset, whiteCol);
} else {
drawPixel(data, offset, blackCol);
}
bits >>= 1;
}
if (!this._refreshing) {
this._refreshing = true;
const after = addr + 1;
this._write(after >> 8, after & 0xff, this._buffer[0][after & 0x1fff], 0);
this._refreshing = false;
}
}
}
}
refresh() {
let addr = 0x2000 * this.page;
this._refreshing = true;
for (let idx = 0; idx < 0x2000; idx++, addr++) {
const page = addr >> 8;
const off = addr & 0xff;
this._write(page, off, this._buffer[0][idx], 0);
if (this.vm._80colMode) {
this._write(page, off, this._buffer[1][idx], 1);
}
}
this._refreshing = false;
}
start() {
return this._start();
}
end() {
return this._end();
}
read(page: byte, off: byte) {
return this._read(page, off, 0);
}
write(page: byte, off: byte, val: byte) {
return this._write(page, off, val, 0);
}
getState(): GraphicsState {
return {
buffer: [
new Uint8Array(this._buffer[0]),
new Uint8Array(this._buffer[1]),
]
};
}
setState(state: GraphicsState) {
this._buffer[0] = new Uint8Array(state.buffer[0]);
this._buffer[1] = new Uint8Array(state.buffer[1]);
this.refresh();
}
}
export class VideoModesGL implements VideoModes {
private _grs: LoresPage[] = [];
private _hgrs: HiresPage[] = [];
private _sv: screenEmu.ScreenView;
private _displayConfig: screenEmu.DisplayConfiguration;
private _scanlines: boolean = false;
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private _refreshFlag: boolean = true;
private _canvas: HTMLCanvasElement;
public ready: Promise<void>
public textMode: boolean;
public mixedMode: boolean;
public hiresMode: boolean;
public pageMode: pageNo;
public _80colMode: boolean;
public altCharMode: boolean;
public an3State: boolean;
public doubleHiresMode: boolean;
public flag = 0;
public monoMode: boolean = false;
public context: CanvasRenderingContext2D;
constructor(
private screen: HTMLCanvasElement,
private e: boolean
) {
this._canvas = document.createElement('canvas');
const context = this._canvas.getContext('2d');
if (!context) {
throw new Error('no 2d context');
}
const { width, height } = screenEmu.C.NTSC_DETAILS.imageSize;
this._canvas.width = width;
this._canvas.height = height;
this.context = context;
this._sv = new screenEmu.ScreenView(this.screen);
this.ready = this.init();
}
async init() {
await this._sv.initOpenGL();
this._displayConfig = this.defaultMonitor();
this._sv.displayConfiguration = this._displayConfig;
}
private defaultMonitor(): screenEmu.DisplayConfiguration {
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const config = new screenEmu.DisplayConfiguration();
config.displayResolution = new screenEmu.Size(this.screen.width, this.screen.height);
config.displayScanlineLevel = 0.5;
config.videoWhiteOnly = true;
config.videoSaturation = 0.8;
config.videoSize = new screenEmu.Size(1.25, 1.15);
config.videoCenter = new screenEmu.Point(0.01, 0.02);
// config.videoDecoder = 'CANVAS_CXA2025AS';
return config;
}
private monitorII(): screenEmu.DisplayConfiguration {
// Values taken from openemulator/libemulation/res/library/Monitors/Apple Monitor II.xml
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const config = new screenEmu.DisplayConfiguration();
config.displayResolution = new screenEmu.Size(this.screen.width, this.screen.height);
config.videoDecoder = 'CANVAS_MONOCHROME';
config.videoBrightness = 0.15;
config.videoContrast = 0.8;
config.videoSaturation = 1.45;
config.videoHue = 0.27;
config.videoCenter = new screenEmu.Point(0.01, 0.02);
config.videoSize = new screenEmu.Size(1.25, 1.15);
config.videoBandwidth = 9000000;
config.displayBarrel = 0.1;
config.displayScanlineLevel = 0.5;
config.displayCenterLighting = 0.5;
config.displayLuminanceGain = 1.5;
return config;
}
private _refresh() {
this.doubleHiresMode = !this.an3State && this.hiresMode && this._80colMode;
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this._refreshFlag = true;
if (this._displayConfig) {
this._displayConfig.videoWhiteOnly = this.textMode || this.monoMode;
this._displayConfig.displayScanlineLevel = this._scanlines ? 0.5 : 0;
this._sv.displayConfiguration = this._displayConfig;
}
}
refresh() {
this._refresh();
}
reset() {
this.textMode = true;
this.mixedMode = false;
this.hiresMode = true;
this.pageMode = 1;
this._80colMode = false;
this.altCharMode = false;
this.an3State = true;
this._refresh();
}
setLoresPage(page: pageNo, lores: LoresPage) {
this._grs[page - 1] = lores;
}
setHiresPage(page: pageNo, hires: HiresPage) {
this._hgrs[page - 1] = hires;
}
text(on: boolean) {
const old = this.textMode;
this.textMode = on;
if (old != on) {
this._refresh();
}
}
_80col(on: boolean) {
if (!this.e) { return; }
const old = this._80colMode;
this._80colMode = on;
if (old != on) {
this._refresh();
}
}
altChar(on: boolean) {
if (!this.e) { return; }
const old = this.altCharMode;
this.altCharMode = on;
if (old != on) {
this._refresh();
}
}
hires(on: boolean) {
const old = this.hiresMode;
this.hiresMode = on;
if (old != on) {
this._refresh();
}
}
an3(on: boolean) {
if (!this.e) { return; }
const old = this.an3State;
this.an3State = on;
if (old != on) {
this._refresh();
}
}
doubleHires(on: boolean) {
this.an3(!on);
}
mixed(on: boolean) {
const old = this.mixedMode;
this.mixedMode = on;
if (old != on) {
this._refresh();
}
}
page(pageNo: pageNo) {
const old = this.pageMode;
this.pageMode = pageNo;
if (old != pageNo) {
this._refresh();
}
}
isText() {
return this.textMode;
}
isMixed() {
return this.mixedMode;
}
isPage2() {
return this.pageMode == 2;
}
isHires() {
return this.hiresMode;
}
isDoubleHires() {
return this.doubleHiresMode;
}
is80Col() {
return this._80colMode;
}
isAltChar() {
return this.altCharMode;
}
updateImage(
mainData: ImageData,
mainDirty: Region,
mixData?: ImageData | null,
mixDirty?: Region | null
) {
let blitted = false;
if (mainDirty.bottom !== -1 || (mixDirty && mixDirty.bottom !== -1)) {
const imageData = this.buildScreen(mainData, mixData);
const imageInfo = new screenEmu.ImageInfo(imageData);
this._sv.image = imageInfo;
blitted = true;
}
this._sv.vsync();
return blitted;
}
buildScreen(mainData: ImageData, mixData?: ImageData | null) {
const details = screenEmu.C.NTSC_DETAILS;
const { width, height } = details.imageSize;
const { x, y } = this._80colMode ? details.topLeft80Col : details.topLeft;
if (mixData) {
this.context.putImageData(mainData, x, y, 0, 0, 560, 160);
this.context.putImageData(mixData, x, y, 0, 160, 560, 32);
} else {
this.context.putImageData(mainData, x, y);
}
return this.context.getImageData(0, 0, width, height);
}
blit(altData?: ImageData) {
let blitted = false;
const hgr = this._hgrs[this.pageMode - 1];
const gr = this._grs[this.pageMode - 1];
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if (this._refreshFlag) {
hgr.refresh();
gr.refresh();
this._refreshFlag = false;
}
if (altData) {
blitted = this.updateImage(
altData,
{ top: 0, left: 0, right: 560, bottom: 192 }
);
} else if (this.hiresMode && !this.textMode) {
blitted = this.updateImage(
hgr.imageData,
hgr.dirty,
this.mixedMode ? gr.imageData : null,
this.mixedMode ? gr.dirty : null
);
} else {
blitted = this.updateImage(
gr.imageData, gr.dirty
);
}
hgr.dirty = {...notDirty};
gr.dirty = {...notDirty};
return blitted;
}
getState(): VideoModesState {
return {
grs: [this._grs[0].getState(), this._grs[1].getState()],
hgrs: [this._hgrs[0].getState(), this._hgrs[1].getState()],
textMode: this.textMode,
mixedMode: this.mixedMode,
hiresMode: this.hiresMode,
pageMode: this.pageMode,
_80colMode: this._80colMode,
altCharMode: this.altCharMode,
an3State: this.an3State,
flag: 0
};
}
setState(state: VideoModesState) {
this.textMode = state.textMode;
this.mixedMode = state.mixedMode;
this.hiresMode = state.hiresMode;
this.pageMode = state.pageMode;
this._80colMode = state._80colMode;
this.altCharMode = state.altCharMode;
this.an3State = state.an3State;
this._grs[0].setState(state.grs[0]);
this._grs[1].setState(state.grs[1]);
this._hgrs[0].setState(state.hgrs[0]);
this._hgrs[1].setState(state.hgrs[1]);
this._refresh();
}
mono(on: boolean) {
this.monoMode = on;
this._displayConfig = on ? this.monitorII() : this.defaultMonitor();
this._refresh();
}
scanlines(on: boolean) {
this._scanlines = on;
this._refresh();
}
getText() {
return this._grs[this.pageMode - 1].getText();
}
}