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Found a work-around for preventing browsers from "easing" (aka de-zippering) the sound from an oscillator when its frequency is altered; also attempted to provide a mechanism for starting the audio in response to a user-generated (eg, touchstart) event, in an effort to enable PC speaker sounds on an iPad, but iOS devices are a real pain in the butt....

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Jeff Parsons 2017-08-12 12:15:24 -07:00 • committed by Jeff Parsons
commit 33cabfc348
9 changed files with 2119 additions and 1991 deletions
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26
modules/pcx86/lib/video.js
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@ -2503,6 +2503,15 @@ class Video extends Component {
if (this.kbd) this.captureTouch(Video.TOUCH.KEYGRID);
}
/*
* If no touch support was required or requested, we still want to do some minimal touch event processing;
* eg, notifying the ChipSet component whenever a touchstart occurs, so that it can enable audio in response
* to a user action on iOS devices.
*/
if (!this.nTouchConfig) {
this.captureTouch(Video.TOUCH.DEFAULT);
}
if (this.sFileURL) {
var sProgress = "Loading " + this.sFileURL + "...";
Web.getResource(this.sFileURL, null, true, function(sURL, sResponse, nErrorCode) {
@ -2783,16 +2792,25 @@ class Video extends Component {
if (control) {
var video = this;
if (!this.nTouchConfig) {
this.nTouchConfig = nTouchConfig;
control.addEventListener(
'touchstart',
function onTouchStart(event) { video.onTouchStart(event); },
false // we'll specify false for the 'useCapture' parameter for now...
);
if (nTouchConfig == Video.TOUCH.DEFAULT) {
return;
}
control.addEventListener(
'touchmove',
function onTouchMove(event) { video.onTouchMove(event); },
true
);
control.addEventListener(
'touchend',
function onTouchEnd(event) { video.onTouchEnd(event); },
@ -2822,7 +2840,6 @@ class Video extends Component {
// this.log("touch events captured");
this.nTouchConfig = nTouchConfig;
this.xTouch = this.yTouch = this.timeTouch = -1;
/*
@ -2879,6 +2896,8 @@ class Video extends Component {
onTouchStart(event)
{
if (DEBUG) this.printMessage("onTouchStart()");
this.chipset.startAudio(event);
if (this.nTouchConfig == Video.TOUCH.DEFAULT) return;
this.processTouchEvent(event, true);
}
@ -7432,8 +7451,9 @@ Video.cardSpecs[Video.CARD.VGA] = ["VGA", Card.CGA.CRTC.INDX.PORT, 0xB8000, 0x04
*/
Video.TOUCH = {
NONE: 0,
KEYGRID: 1,
MOUSE: 2
DEFAULT: 1,
KEYGRID: 2,
MOUSE: 3
};
/*