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Additive Blending on a floating point PBuffer

Subject: Additive Blending on a floating point PBuffer
From: Ben Blundell <email@hidden>
Date: Tue, 30 Nov 2004 19:55:29 +0000 (GMT)
Delivered-to: email@hidden
Delivered-to: email@hidden

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?

Cheers

Ben B

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