How to pass a vector array to a shader?

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Dark GDK / How to pass a vector array to a shader?

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_Pauli_

AGK Developer

Years of Service

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Joined: 13th Aug 2009

Location: Germany

Posted: 13th May 2010 00:20

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Hey,
I'm trying to figure this out. Unfortunatly there is no command for this in DarkGDK.

So, here is what I have so far:

+ Code Snippet

// create the array
D3DXVECTOR4 VectorArray[5];

// get pointer to the DarkGDK object first
sObject * pObj = dbGetObject( ObjectID );

// get the handle to the parameter
D3DXHANDLE hParam = pObj->pFrame->pMesh->pVertexShaderEffect->m_pEffect->GetParameterByName( NULL, "fVectorArray" );

// set array as effect parameter
pObj->pFrame->pMesh->pVertexShaderEffect->m_pEffect->SetVectorArray( hParam, VectorArray, 5 );

I thought that would do it, but I get an unhandled exception pointing to the line with 'D3DXHANDLE hParam = (...)'!
What could be wrong here?
I don't use DirectX stuff often so I'm stuck right now...
Has anybody experience with this?

Now the plot thickens, the fps decreases, and the awesomeness goes through the roof.

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_Pauli_

AGK Developer

Years of Service

User Offline

Joined: 13th Aug 2009

Location: Germany

Posted: 13th May 2010 00:58

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Ok, I have this fixed.

There was a problem with the model that the effect was applied to.
Somehow my described method above doesn't seem to work with loaded objects (from .x-files).
But it works with DarkGDK primitives. The good thing is that when you pass the array to a shader effect, the change becomes effective on all objects that use the same effect!
So you can just create a temporary cube, apply the effect to it and make your changes.

Hope this helps someone.

Now the plot thickens, the fps decreases, and the awesomeness goes through the roof.

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Dark GDK / How to pass a vector array to a shader?