matrox with vertex-shaders? maybe with a g800

[der-Leo]

hi

i found on the matrox ftp-server a dx8-sample-application for
vertex-shaders.

but for what?
the g4x0 don't support vertexshaders.

you can find the file here:

http://ftp.matrox.com/pub/mga/devrel/g400/vs_skinflag.zip

it's there since 06-Feb-2001.

maybe for a new card with full dx8 support?

der-Leo

[Haig]

Hi Leo,

it's just a simple demo of geometry skinning using DX8 vertex shaders. You can use it on the G400 since this demo is using software vertex shaders.

Haig

[cjolley]

Oh Haig! You tease you.
chuck

[xortam]

<font face="Verdana, Arial, Helvetica" size="2">Originally posted by Haig:
... You can use it on the G400 since this demo is using software vertex shaders ...</font>

Can the demo use HW shaders if the appropriate video card was used?

[Haig]

Theoretically it should, provided if the demo was programmed to also use HW vertex shaders

Haig

[This message has been edited by Haig (edited 06 March 2001).]

[Nappe1]

I am Back!

this is starting to sound very promising...

hmmh.... Anyone wants to buy ATi AIW Radeon when the summer comes?


[This message has been edited by Nappe1 (edited 06 March 2001).]

[Maggi]

<font face="Verdana, Arial, Helvetica" size="2">Originally posted by Haig:
Theoretically it should, provided if the demo was programmed to also use HW vertex shaders
</font>

... is it ?

[Haig]

Nope.

Haig

[Maggi]

dammit ... would have been too easy ...

[DGhost]

Hmmm....

out of simple curiosity...

1) How hard would it be to rewrite to to use hardware vertex shaders.... seeing as the only thing that looks to define it as a vertex shader is in one commmand.... dunno much about DX tho...

it seems to be defined in this line:
hr = m_pd3dDevice->CreateVertexShader( dwDecl,(DWORD*)pCode->GetBufferPointer(),&m_dwShader,D3DUSAGE_SOFTWAREP ROCESSING );

and later, in the init, it checks for either hardware or presumably software implementation of vertex shaders... again, i'm not much into DirectX, but it seems to me it was written so that it could (w/ minimal effort) be rewritten to take advantage of it...

and, according to the DX sample code i have, by changing the D3DUSAGE_SOFTWAREPROCESSING to a 0 should accomplish this...

2) And i noticed lots of calls to things like D3DXMatrixMultiply() and D3DXMatrixTranspose()...

my understanding of DirectX is that functions inside it can be either hardware accelerated, or not. now then, for code readability, it would be easier to use the built in functions... but usually programmers prefer to use their own functions... it is very useful to know how the code works...

and, seeing as the other demos i have seen from matrox define their own functions for these things, why would they switch over to using the DirectX implementations?


Any comments? Haig? =)

[SCompRacer]

Hello Haig!....they got an opening in Montreal area for my company, got a chance for an interview.

How do Canadians feel about Yankee transplants?

[Haig]

You're right DG, it wouldn't be a big deal to change it over to hardware based. Then again, most dx8 demo's can go from hardware to software back and forth with minimal effort.

Yankee transplants are a dime a dozen over here so another one wouldn't hurt

Haig