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

[Carsten O. <car...@se...>]

This might be obvious, but you _are_ setting up three stages
for color _and_ alpha operations, right?
It might also be helpful to not only disable stage 3 but to
do it all the way up to stage 8. Just in case...

Carsten Orthbandt
Founder + Development Director
SEK SpieleEntwicklungsKombinat GmbH
http://www.sek-ost.de

Wenn ich Visionen habe, gehe ich zum Arzt. - Helmut Schmidt
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> -----Original Message-----
> From: gam...@li...=20
> [mailto:gam...@li...] On=20
> Behalf Of Jon Watte
> Sent: Wednesday, March 03, 2004 3:19 AM
> To: gam...@li...
> Subject: [GD-Windows] Direct3D 8.0 texture stage states
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> We're porting an OpenGL renderer to Direct3D 8.0.
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> The documentation in concordance with the device caps for a=20
> GeForce2 claim
> that you can configure up to 8 texture stage states, but you=20
> can only bind
> two textures. We have a specific texturing set-up that in=20
> OpenGL looks like
> this:
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> Texture0 \
>           LERP \
> Texture1 /      MODULATE -> done
>        Diffuse /
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> This uses 2 texture environments on OpenGL, but it appears=20
> that DirectX 8
> for fixed-function hardware cannot route two textures to one=20
> texture stage
> state. Thus, we want to use three stage states, in the following
> configuration:
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> Texture0 \
>           SELECT1 \
>                    LERP \
>          Texture1 /      MODULATE -> done
>                 Diffuse /
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> We can get the first two stages to work fine, but as soon as=20
> we turn on the
> third stage, the operations from the first two stages=20
> disappear, and we get
> solid-white diffuse lit geometry. Note that we get that, even=20
> if we choose
> SELECTARG1 for the operation for the third stage state (i e=20
> stage state
> index 2).
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> We are disabling the stage state with index 3, just to make=20
> sure that we've
> gotten nothing wrong. However, no matter what we do, we can't=20
> 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).
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> Right now, we're feeling pretty glum. Any ideas?
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> Cheers,
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> 			/ h+
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