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- Description
The TDx_3DDevice::ValidateDevice() method will check if the device can render the currently set render states, textures and texture stage states in one pass.
You can determine if a specific blending operation can be performed by setting it up and calling this method.
Since this method uses the current render state, texture states and textures, modifications to those values may invalidate the results of previous ValidateDevice calls.
Try to specify the texture (D3DTA_TEXTURE) for each stage as the 1st argument rather than the second.
At the time Dx7 was published:
Diffuse iterated values as an argument or operation (D3DTA_DIFFUSE or D3DTOP_BLENDDIFFUSEALPHA) were rarely supported, iterated color data often only being introduceable at the last texture stage.
Diffuse or scalar values at arbitrary texture stages were rarely supported, more often it was required that they be applied to the first or last texture stage.
Alpha operations that were intricate or substantially different to the color operations were less likely to be supported.
Often cards only have a simple blending unit associated with the first texture, so you may need to only use the 2nd texture stage, setting D3DTA_TEXTURE -> D3DTOP_SELECTARG1 for the first one.
Sometimes simultaneous use of D3DTA_TFACTOR and D3DTA_DIFFUSE is unsupported.
Sometimes simultaneous multitexture blending and mipmapped trilinear filtering is unsupported, try turning off trilinear and revalidating. Maybe use multipass rendering instead.
If the method call fails, the OnError event will be triggered with one of the following values:
DDERR_INVALIDOBJECT
DDERR_INVALIDPARAMS
D3DERR_CONFLICTINGTEXTUREFILTER
D3DERR_CONFLICTINGTEXTUREPALETTE
D3DERR_TOOMANYOPERATIONS
D3DERR_UNSUPPORTEDALPHAARG
D3DERR_UNSUPPORTEDALPHAOPERATION
D3DERR_UNSUPPORTEDCOLORARG
D3DERR_UNSUPPORTEDCOLOROPERATION
D3DERR_UNSUPPORTEDFACTORVALUE
D3DERR_UNSUPPORTEDTEXTUREFILTER
D3DERR_WRONGTEXTUREFORMAT
- Parameters
Passes
The Passes parameter will reference the number of rendering passes required to complete the currently defined operation.
- See Also
- Top
TDx_3DI_Library v2.00 Component Reference
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[ TDx_3DDevice::ValidateDevice() ] [ prev: SetViewPort() ] public:
virtual bool __fastcall ValidateDevice( dword* pPasses );
TDX_3DDEVICE::VALIDATEDEVICE()
[ component method ]
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