1516102 - WebGL GL_EXT_draw_buffers fails in shader even though the extension is present

Status: RESOLVED DUPLICATE of bug 1524804

(Core :: Graphics: CanvasWebGL, defect, P3)

Description

[Tobias Rautenkranz]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0

Steps to reproduce:

Using Firefox 66.0a1 (Nightly; webgl-draft-extensions enabled) on a Nokia 6.1 Android phone; using the WEBGL_draw_buffers extension test:
https://www.khronos.org/registry/webgl/sdk/tests/conformance/extensions/webgl-draw-buffers.html
gives the following error:
FAIL fragment shader containing the #extension directive should compile


Actual results:

The relevant console output is:
*** Error compiling FRAGMENT_SHADER '[object WebGLShader]':ERROR: 0:2: 'GL_EXT_draw_buffers' : extension is not supported
js-test-pre.js:153:9 


Expected results:

The shader compiler and js extension query should agree whether the extension is supported. Note, that:
gl.getExtension("WEBGL_draw_buffers")
returns a valid WEBGL_draw_buffers object