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core/Window: implement getActualFrameRate, update monitorFramePeriod accordingly

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This commit is contained in:
Sotiri Bakagiannis 2021-01-29 12:07:27 +00:00
parent 523dc2d006
commit 5408f4c2dd
1 changed files with 10 additions and 9 deletions
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19
js/core/Window.js
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@ -41,7 +41,7 @@ export class Window extends PsychObject
*/
get monitorFramePeriod()
{
return this._monitorFramePeriod;
return 1.0 / this.getActualFrameRate();
}
constructor({
@ -69,9 +69,6 @@ export class Window extends PsychObject
// setup PIXI:
this._setupPixi();
// monitor frame period:
this._monitorFramePeriod = 1.0 / this.getActualFrameRate();
this._frameCount = 0;
this._flipCallbacks = [];
@ -145,14 +142,18 @@ export class Window extends PsychObject
* @name module:core.Window#getActualFrameRate
* @function
* @public
* @return {number} always returns 60.0 at the moment
*
* @todo estimate the actual frame rate.
* @return {number} rAF based delta time based approximation, 60.0 by default
*/
getActualFrameRate()
{
// TODO
return 60.0;
// gets updated frame by frame
const lastDelta = this.psychoJS.scheduler._lastDelta;
const fpsMaybe = 1000 / lastDelta;
// NB: calling `Number.isFinite()` might skip the implicit to number conversion, but
// would also need polyfilling for IE
const fps = isFinite(fpsMaybe) ? fpsMaybe : 60.0;
return fps;
}