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Re: [Public WebGL] Move flipY and asPremultipliedAlpha parameters out of DOM helpers



On Sun, May 23, 2010 at 10:49 PM, Mark Callow <callow_mark@hicorp.co.jp> wrote:
> On 20/05/2010 10:45, Kenneth Russell wrote:
>
> OpenGL ES 2.0 eliminated the GL_GENERATE_MIPMAP texture parameter, replacing
> it with the explicit glGenerateMipmap, presumably because of ill defined
> semantics.
>
> No. It was removed from OpenGL ES because it is a second way of
> accomplishing generation of mipmaps. It was subsequentl removed from Open GL
> 3.2 for much the same reason.
>
> The semantic was clear. The older spec. said "If the value of texture
> parameter GENERATE MIPMAP is TRUE, and a change is made to the interior or
> border texels of the level base array of a mipmap by one of the texture
> image specification operations ... a complete set of mipmap arrays ... will
> be computed." As the portions I have highlighted clearly state, no mipmaps
> will be generated until a change is made by, e.g., TexImage2D. Merely
> setting the parameter does nothing.
>
> Cedric's proposed semantic does indeed have precedent.

OK. Thanks for the clarification.

-Ken
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