blend-function? ( object -- ? )

Vocabulary

gpu.state

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the blend-function class.

Definition

USING: kernel ;

IN: gpu.state

: blend-function? ( object -- ? )
    dup func-one-minus-constant-alpha?
    [ drop t ] [
        dup func-constant-alpha?
        [ drop t ] [
            dup func-one-minus-dest-alpha?
            [ drop t ] [
                dup func-dest-alpha?
                [ drop t ] [
                    dup func-one-minus-source-alpha?
                    [ drop t ] [
                        dup func-source-alpha? ~quotation~
                        ~quotation~ if
                    ] if
                ] if
            ] if
        ] if
    ] if ;