On Tue, Mar 13, 2012 at 12:47 PM, Gregg Tavares (勤) <email@example.com
> On Tue, Mar 13, 2012 at 9:33 AM, Glenn Maynard <firstname.lastname@example.org
>> On Tue, Mar 13, 2012 at 10:58 AM, Tim Johansson <email@example.com
>>> For example validateProgram and useProgram both take WebGLProgram but
>>> have to accept null to pass the conformance tests IIRC. In the case of
>>> validateProgram it should give you INVALID_VALUE and in the case of
>>> useProgram it should actually do something (unbind the current program).
>> The conformance test is incorrect; validateProgram(null) should throw
>> TypeError. (Since the WebGL spec doesn't correctly use nullable parameters,
>> it's not too surprising if the tests get them wrong, too.)
> I think it comes down to emulating OpenGL or not. glValidateProgram excepts
> 0 will generate INVALID_VALUE therefore it's not unreasonable for WebGL to
> do the same. I don't expect any programs use validateProgram but the idea is
> that OpenGL programs should be portable to WebGL with as few changes as
> glTexSubImage2D if passed null will crash if all other parameters are valid.
> Therefore throwing an exception if passed null OpenGL seems more acceptable.
> On the the other hand, calling
> GLint width = 0;
> GLint height = 0;
> glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RGBA,
> GL_UNSIGNED_BYTE, NULL);
> will likely not crash since no data will be referenced.