RE: [GD-Windows] Direct3D 8.0 texture stage states

[Daniel V. <vo...@ep...>]

Jon, you're best off contacting NVIDIA devrel about the issue as there are
only a handful 3 stage setups that work on GeForce 1/2 class hardware. Tom's
blog <http://tomsdxfaq.blogspot.com/> has a little blurb on the issue.

-- Daniel, Epic Games Inc.  

> -----Original Message-----
> From: gam...@li... 
> [mailto:gam...@li...] On 
> Behalf Of Jon Watte
> Sent: Tuesday, March 02, 2004 9:19 PM
> To: gam...@li...
> Subject: [GD-Windows] Direct3D 8.0 texture stage states
> 
> 
> We're porting an OpenGL renderer to Direct3D 8.0.
> 
> The documentation in concordance with the device caps for a 
> GeForce2 claim
> that you can configure up to 8 texture stage states, but you 
> can only bind
> two textures. We have a specific texturing set-up that in 
> OpenGL looks like
> this:
> 
> Texture0 \
>           LERP \
> Texture1 /      MODULATE -> done
>        Diffuse /
> 
> This uses 2 texture environments on OpenGL, but it appears 
> that DirectX 8
> for fixed-function hardware cannot route two textures to one 
> texture stage
> state. Thus, we want to use three stage states, in the following
> configuration:
> 
> Texture0 \
>           SELECT1 \
>                    LERP \
>          Texture1 /      MODULATE -> done
>                 Diffuse /
> 
> We can get the first two stages to work fine, but as soon as 
> we turn on the
> third stage, the operations from the first two stages 
> disappear, and we get
> solid-white diffuse lit geometry. Note that we get that, even 
> if we choose
> SELECTARG1 for the operation for the third stage state (i e 
> stage state
> index 2).
> 
> We are disabling the stage state with index 3, just to make 
> sure that we've
> gotten nothing wrong. However, no matter what we do, we can't 
> make this
> work. We've tried both debug and release DirectX 9.0b runtime (can't
> downgrade on the development machines to try with 8.0 proper).
> 
> Right now, we're feeling pretty glum. Any ideas?
> 
> Cheers,
> 
> 			/ h+
> 
> 
> 
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