alpha blend vs alpha test
Posted: Sat Jul 31, 2004 9:12 am
Hi
I want to learn more about DirectX so I've been looking through the directx9 videodriver and found something that I don't understand.
when using Material irr::video::EMT_TRANSPARENT_ALPHA_CHANNEL
the renderstates for ALPHATEST and ALPHABLEND are enabled. Doesn't these two states exclude each other?
This is what I thought they do:
ALPHABLEND enables blending according to the texture and source alpha values. (depends on the chosen blend_func)
ALPHATEST set a threshold for alpha values, pixels with values beyond the threshold will not be painted. (depends on the chosen alpha_func)
I'm new to DX so if someone could please explain what this constelation does?
Thanks
I want to learn more about DirectX so I've been looking through the directx9 videodriver and found something that I don't understand.
when using Material irr::video::EMT_TRANSPARENT_ALPHA_CHANNEL
the renderstates for ALPHATEST and ALPHABLEND are enabled. Doesn't these two states exclude each other?
This is what I thought they do:
ALPHABLEND enables blending according to the texture and source alpha values. (depends on the chosen blend_func)
ALPHATEST set a threshold for alpha values, pixels with values beyond the threshold will not be painted. (depends on the chosen alpha_func)
I'm new to DX so if someone could please explain what this constelation does?
Thanks