On Mar 26, 9:37 am, Thomas Woelz <[EMAIL PROTECTED]> wrote:
> Hi,
> I noticed that when I provide color with alpha to a Label the
> transparency works immediately, while doing the same to vertex lists
> it will only work if somewhere in my code I did put the following:
>
> glEnable(GL_BLEND)
> glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
>
> Sorry if this is a newbie question, I swear I tried to figure this out
> looking at the code but I couldn't. Is there a way for the
> transparency to apply without setting the whole window thing to blend?
The question is not what portion of a window GL_BLEND applies to, but
rather what parts of your scene it applies to. That is controlled by
what parts of your scene are drawn between glEnable(GL_BLEND) and
glDisable(GL_BLEND) AND what is already in the color buffer to be
blended with when you do such blends.
The proper use of GL_BLEND includes:
Draw the background objects first.
glEnable(GL_BLEND)
glBlendFunc(...) // usually unnecessary unless changed elsewhere
Draw transparent object with its alpha
glDisable(GL_BLEND) // A good idea so other objects are not
affected.
Apparently the Label code already got all this stuff correct, and you
have just discovered that your code needs to get it right also.
Gary Herron
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