Addtive texture transparency


how can i get additive transparency when drawing my textures? i use Blend( ONE, ONE ); but it doesn´t work as i expected.

i want saturated add:

Rs+Rd = (Rs+Rd) > 255 ? 255 : (Rs+Rd);


PD: do i have to use any extension like env_combine?

Well … glBlend(GL_ONE,GL_ONE) actually works that way (at least should work that way)

i’ve found the problem…it was the zbuffer, (cause i’m not using to use zbuffering) that ‘was eating’ some pixels from the triangle…

thx anyway!!!