PBR shader error on WebGL1.0

Bugs
7

@sebavan and another problem when Engine creation:

image
image534×539 159 KB

I think same as this one:

I modified the source code according to that issue to:

if (this._gl.HALF_FLOAT_OES !== 0x8D61) { // Half floating-point type (16-bit).
        this._gl.HALF_FLOAT_OES != 0x8D61;
    }

and it works, but not sure if this is the solution.

I refered the next line in the source code: