It seems like, when the additive blended values of pixels gets too high, the pixels end up rendering in black instead of white. It creates some issues with one of the pixel shaders I wrote. I may be misinterpreting this, so any help / advise is appreciated.
Here's some examples of the problem I'm having with my pixel shaders:
Here's an example that does not involve my pixel shader:
I don't seem to be having this issue on ATI cards. Anyone have an idea as to what the problem is?