vertex-array? ( object -- ? )

Vocabulary

gpu.shaders

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the vertex-array class.

Definition

USING: classes.tuple.private kernel math.private slots.private ;

IN: gpu.shaders

: vertex-array? ( object -- ? )
    dup tuple? [
        layout-of
        dup
        7
        slot
        \ vertex-array-collection
        eq?
        [ drop t ]
        [
            dup
            1
            slot
            11
            fixnum>=
            [ 11 slot \ vertex-array-object eq? ]
            [ drop f ]
            if
        ]
        if
    ] [ drop f ] if ;