regl framebuffer bug demo

bugs.js

/**
Error (approximate, line numbers may have changed):

check.js:20Uncaught Error: (regl) invalid value: invalid color format for texture. must be one of: rgba
  raise @ check.js:20
  checkOneOf @ check.js:71
  reglFramebuffer @ framebuffer.js:419
  createFBO @ framebuffer.js:613
  1.gl-mat4 @ bugs.js [sm]:47
  s @ _prelude.js:1e @ _prelude.js:
  1(anonymous function) @ _prelude.js:1
*/



const mat4 = require('gl-mat4');
const resl = require('resl');
const regl = require('regl')();

const M = [256,256];


const graph_texture_width = regl.limits.maxTextureSize;
const graph_texture_height = regl.limits.maxTextureSize;

const quadVertexShader = `
    precision mediump float;
    attribute vec3 position;
    attribute vec2 uv;
    varying vec2 vUv;
    
    void main() {
        vUv = uv;
        gl_Position = vec4(position, 1);
    }
`;

const quadFragShader = `
    precision mediump float;
    varying vec2 vUv;
    uniform sampler2D tex;
    void main () {
        gl_FragColor = texture2D(tex,vUv);
    }
`;

const quadVerts = [
  [-1.0, +1.0, +0.0], [+1.0, +1.0, +0.0], [+1.0, -1.0, +0.0], [-1.0, -1.0, +0.0]
]
 
const quadUVs = [
  [0.0, 1.0], [1.0, 1.0], [1.0, 0.0], [0.0, 0.0]
]
 
const quadIndices = [
  [2, 1, 0], [2, 0, 3]
]



let bad_color_format = regl.framebuffer({
      width: M[0],
      height: M[1],
      depth: false,
      stencil: false,
      colorFormat: 'rgb',
      colorType: 'float'
    });