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I made a quad with a nice texture on it. The texture has an alpha channel (RGBA). I replaced the quad with the texture (GL_REPLACE), so now I have a billboard with (semi)transparant pixels on it.
So far, no problem.
But now I want to blend the entire billboard, so it’s overall opacity changes.
How would I do this?
GL_MODULATE, instead of GL_REPLACE, after setting the color to solid white, with an appropriate amount of alpha. (glColor(1,1,1,0.5) for instance)
(Should work fine on OpenGL. Seems likely it’ll be good on ES, too.)