1082619 - FBOs with color and stencil only are not guaranteed

Status: RESOLVED WONTFIX

(Core :: Graphics: CanvasWebGL, enhancement, P5)

Description

[Jukka Jylänki]

Attachment: firefox_webgl_color_stencil_fbo_bug.html

If a FBO contains both color and stencil attachments, but no depth attachment, then the FBO is erroneously reported as being incomplete.

STR:
1) Load the attached file.

Observed: The page prints 'Status: 36061, is complete? false'

Expected: The page should print 'Status: 36053, is complete? true'

This issue was tested to occur in Firefoxes 32.0.3 and Nightly 36.0a1 (2014-10-14). Also Chrome version 37.0.2062.124 has this issue, so it is probably in Angle.

The issue was tested to occur on a Macbook Pro Retina, 15-inch, Early 2013 laptop on OSX 10.8.5 with 2.7GHz Intel Core i7 and NVidia GeForce GT 650M. Another Macbook Air laptop with Intel HD 3000 from 2011 running Windows in bootcamp does not exhibit the issue.

Comment 1

[Jukka Jylänki]

Err, nevermind the comment about Angle, since this was seen to be OSX-only.

Comment 2

[Kelsey Gilbert [:jgilbert]]

I'm not going to WONTFIX this, but neither the GLES2 nor the WebGL1 specs require that color+stencil will be FB-complete.

Comment 3

[Kelsey Gilbert [:jgilbert]]

I think I will WONTFIX this. Papering over this by using a x24s8 format instead hides this 3x overhead, whereas an app may make different choices if it can tell that s8 alone doesn't work.