On Tuesday, November 30, 2004, at 07:55PM, Ben Blundell <email@hidden> wrote:
>Hiya All. Im working on moving an intensive algorithm to work on the GPU.
>I need to blend several polygons with floating point textures additively.
>Ideally if 2 polygons were covered in a texture with 0.5f as the colour,
>the resulting polygon would be 1.0f. Fairly simple i figured. However, i
>need to modify these values using Cg or some shader language. So far it
>"appears" that the Cg bit is doing its job. However, the results are not
>quite what i'd expected. I just wondered, is it possible to do floating
>point additive blending on the PBuffer using the Radeon 9700 inside a
>powerbook G4?
No.
Nothing short of a GeForce 6800 can do blending of floating point fragments.
A 9700 Mobility (as you have) certainly can't.
--
James Milne
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