> # NAME

> cgD3D9GetVertexDeclaration - get the default vertex declaration stream

> # SYNOPSIS

>       #include <Cg/cgD3D9.h>

>       CGbool cgD3D9GetVertexDeclaration( CGprogram program,
>                                          D3DVERTEXELEMENT9 decl[MAXD3DDECLLENGTH] );

> # PARAMETERS

> program

>   The program from which to retrieve the vertex declaration.

> decl

>   A D3DVERTEXELEMENT9 array that will be filled with the D3D9 vertex declaration.

> # RETURN VALUES

> Returns CG_TRUE on success.

> Returns CG_FALSE otherwise.

> # DESCRIPTION

> cgD3D9GetVertexDeclaration retrieves the default vertex declaration stream for a program. The declaration always uses a tightly packed single stream. The stream is always terminated with D3DDECL_END(), so this can be used to determine the actual length of the returned declaration.

> The default vertex declaration is always a single stream. There will be one D3DVERTEXELEMENT9 element for each varying input parameter.

> If you want to use a custom vertex declaration, you can test that declaration for compatibility by calling cgD3D9ValidateVertexDeclaration.

> # EXAMPLES

> For example:

>       void main( in float4 pos : POSITION,
>                  in float4 dif : COLOR0,
>                  in float4 tex : TEXCOORD0,
>                  out float4 hpos : POSITION );

> would have this default vertex declaration:

>       const D3DVERTEXELEMENT9 decl[] = {
>         { 0,  0, D3DDECLTYPE_FLOAT4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION, 0 },
>         { 0, 16, D3DDECLTYPE_FLOAT4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_COLOR, 0 },
>         { 0, 32, D3DDECLTYPE_FLOAT4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 0 },
>         D3DDECL_END()
>       };

> # ERRORS

> CG_INVALID_PROGRAM_HANDLE_ERROR is generated if program is not a valid program handle.

> # HISTORY

> cgD3D9GetVertexDeclaration was introduced in Cg 1.1.

> # SEE ALSO

> cgD3D9ValidateVertexDeclaration