P5.js: beginShape should not require call to fill() in order to render

[RoelandMatthijssens]

I have a minimal example set up that uses the webgl renderer

function setup(){
    createCanvas(100, 100, WEBGL);
}

function draw(){
    beginShape(POINTS);
    vertex(0,0);
    endShape();
} 

Running this produces the following errors:

p5.js:31516 WebGL: INVALID_VALUE: enableVertexAttribArray: index out of rangep5.RendererGL._bindImmediateBuffers @ p5.js:31516p5.RendererGL.endShape @ p5.js:31447p5.endShape @ p5.js:15190draw @ sketch.js:8p5.redraw @ p5.js:14256(anonymous function) @ p5.js:9143
p5.js:31520 WebGL: INVALID_VALUE: vertexAttribPointer: index out of range

I'm using the latest version of p5.js (p5.js v0.5.4 October 01, 2016)

[lmccart]

the warning shouldn't prevent drawing, but it's letting you know that you haven't set a fill color so you may not see the lines. try adding a line before that setting fill:

function setup(){
  createCanvas(500,500,WEBGL);
}

function draw(){
  beginShape();
  fill(255, 0, 0);
  vertex(100,23,-100);
  vertex(200,23,-50);
  vertex(150, 45,-100);
  endShape();
}

@indefinit @mindofmatthew I think this shouldn't be necessary in immediate mode. can we set the default colors to white for fill and black for stroke?

[pikiaboy]

Can you even make a 'wire mesh' with webGL? I'm attempting to do what Daniel Shiffman did with his procedural generated terrain, but I am also coming up with the same error as OP. However, using fill(255,0,0) will let it compile, but it won't draw the shape to screen.

[JakeSchroeder]

Hey has anyone found a fix for this issue?

[scenaristeur]

Hi, i've got the same issue for my webgl-app (https://scenaristeur.github.io/graphe/):

p5.js:31517 WebGL: INVALID_VALUE: enableVertexAttribArray: index out of range
p5.RendererGL._bindImmediateBuffers @ p5.js:31517
p5.js:31521 WebGL: INVALID_VALUE: vertexAttribPointer: index out of range 

but when i had

    fill(0, 0, 0);

on the line 177 of my script https://github.com/scenaristeur/graphe/blob/master/js/sketch.js

my canvas is very, very slow, as described in this issue : https://github.com/processing/p5.js/issues/1727

I don't think it's a good solution :-/

[JakeSchroeder]

Man this sucks, I want to use p5 for webgl and this bug is preventing me. Does anyone else know of any alternatives for building 3d webgl content? Maybe three.js or something?

[limzykenneth]

@JakeSchroeder WebGL mode in p5.js is still pretty much work in progress. If you are looking for something more established now, three.js is a pretty good and popular library to deal with WebGL, you can start there.

[pikiaboy]

But I want to use WEBGL. Thats the whole point of it haha XD

On Mon, Apr 17, 2017 at 9:38 PM, Zahir [e-mail] wrote:

When you do the call to createCanvas, try not to add the WEBGL
parameter. Somehow this fixed my problem,

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[plasticruler]

The minimal example given by the OP will work if the WEBGL parameter is omitted. However any 3d-oriented functions such as rotateX will then fail.

[pikiaboy]

Yes, thats because if you omit WEBGL, then you are not using WEBGL to do 3d
things. Which is what I wanted to do. ie; I WANT to use webgl, but p5.js is
not playing nicely with webgl currently

On Tue, Apr 18, 2017 at 9:31 AM, Zahir [e-mail] wrote:

The minimal example given by the OP will work if the WEBGL parameter is
omitted. However any 3d-oriented functions such as rotateX will then fail.

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[lmccart]

closed with https://github.com/processing/p5.js/pull/2088#event-1192353090