texture parameters vs. texture-unit parameters

[LordKronos]

Originally posted by mcraighead:
Use premultiplied alpha textures. Set RGB to 0 when A is 0, and use a blend mode of (for example) ONE,ONE_MINUS_SRC_ALPHA.

- Matt

As I understand this, I dont think it will work. What he is looking for is a linear textured billboard but with sharp edged transparency rather than edges that fade out.

[Pentagram]

LordKronos's idea might work with alpha testing but (as I understand it) it won't work with blending (as he said) enabled (the pixels between the opaque parts with alpha 1.0 and the border with alpha 128 would also be lineary filtered and would thus be transparent). But I need the blending

And what are "premultiplied alpha textures"?
Does it require another texture and a second rendering pass?

Pentagram