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Re: [Public WebGL] readPixles() can't access float values (OES_texture_float interaction)

On Fri, Sep 16, 2011 at 2:14 PM, Kenneth Russell <kbr@google.com> wrote:
Shouldn't the existing need to check the framebuffer's status be
sufficient? Applications that don't check for FBO completeness are by
definition incorrectly written. These applications already have to
request the floating-point texture extension from WebGL.

WebGL's extension mechanism draws a very different policy for optional features than OpenGL: the application has to explicitly enable extensions, even when it has no new entry points or constants, in order to ensure that developers know when they're using optional functionality.  It's not just a mechanism for the program to detect whether the implementation provides the feature; it's also a mechanism for the implementation to not expose functionality that hasn't been explicitly enabled.

I do think it would make sense to extend that here, if the compatibility break is considered acceptable.

(Of course, applications would have to support both methods for a while to support current implementations, importing the extension if present but not depending on it for feature detection, but that would probably only be needed for a year or so.)

Glenn Maynard