I'm writing out all four channels, but then somehow the rgb channels end up with the Alpha value, and the alpha channel ends up with 1.0... Any ideas? At this point in my render, alpha blending is enabled because I'm doing deferred shading. The current pass is the light pass and it does additive blending.
Ok, I'm pretty sure I know what's going on. My apologies, as it seems the problem is my lack of PIX knowledge. PIX shows the many events a pixel goes through, like render calls. Then it shows the final framebuffer value for the pixel (which really means the final framebuffer value for the pixel's coordinates). I was comparing a render call event when drawing the lights to a render target with the final framebuffer value. Obviously these two will be different since the pixel output value I debugged is for the light render target and the final framebuffer value is the final color on screen after combining the light target with a color target. Thanks for your replies!
