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Javascript functions for webgl2 computer graphics

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webgl2-utils

module
event
matrix
program
class
App
LinkedList
function description
async loadFile(url) Fetch file from url and but the promise is rejected if response status is not ok

class App

Abstract class App

Subclasses must implement update() and draw() methods

method description
constructor(canvas, timeStep = 0) Creates an instance of App and gets the webGL rendering context associated with the canvas
get canvas() Get the current canvas
get lag() Get the time ahead of update.
If time step is non zero, when draw is called lag is the residual time of the frame lower than the time step hence not updated.
If time step is variable (timeStep == 0) when draw is called lag is always 0.
get timeStep() Get the time step
set timeStep(dt) Set the time step to a non negative value
getProgram(name) Get the instance of ProgramWrapper from the name
getProgramLoader() Create a ProgramLoader instance for the current app
initMouse() Initialize the mouse event listener for the current canvas
get mouse() Get the mouse event handler if present
initKeyboard() Initialize the keyboard event listener for the current canvas
get keyboard() Get the keyboard event handler if present
run() Initialize and run the loop
stop() Stop the loop
resize(width, height, hdpi=true) Resize the canvas
update(dt) Logic update function
Called every timeStep milliseconds with fixed time step if it is non zero, otherwise it is called every frame with a variable time step.

dt : time elapsed since last update
draw() Rendering function called once per frame

class LinkedList

Simple linked list node class with next node accessor and iterator method

method description
constructor() Create an unlinked node
get next() Get the next node in the list
set next(node) Set the next node in the list
[Symbol.iterator] Iterate over the elements following this in the list

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