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Re: [Public WebGL] Move flipY and asPremultipliedAlpha parameters out of DOM helpers
On Thu, May 20, 2010 at 08:52, Kenneth Russell <email@example.com> wrote:
> Changes to texture parameters take effect immediately. There are no
> texture parameters which affect the behavior of later calls but whose changes are not otherwise seen.
I just realized my argument about this mutual misunderstanding could
have been better without relying on relatively confidential texture
parameters like GENERATE_MIPMAP or CROP_RECT_OES :-P :
Even changing the value of a core texture parameter like
GL_TEXTURE_MIN_FILTER has no demonstrable effect and is not otherwise
seen until a subsequent draw call is using the texture (e.g through
samplers in current shader).
Also, more interestingly, as you've made me doubt (which is always a
good thing :-) ) about if (and how) OpenGL spec defines texture
parameters as state bits and the behavior on changes, I've had a look
and learnt in section D.3 - Propagating Changes to Objects - the
actual definition that definitely clarifies that this is a non-issue :
GL objects contain two types of information, data and state. Collectively these
are referred to below as the /contents/ of an object.
When the /contents/ of an object T are changed, such changes are not always
immediately visible, and do not always immediately affect GL
that object. Changes to an object may occur via any of the following means:
â State-setting commands, such as TexParameter.
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