with-mapped-buffer-array ( ..a buffer access c-type quot: ( ..a array -- ..b ) -- ..b )
GPU-accelerated rendering » Buffer objects

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with-mapped-buffer ( ..a buffer access quot: ( ..a alien -- ..b ) -- ..b )

Vocabulary
gpu.buffers

Inputs

buffer	a buffer
access	a buffer-access-mode
c-type	a C type
quot	a quotation with stack effect ( ..a array -- ..b )

Outputs
None

Word description
Maps buffer into CPU address space with access for the dynamic extent of quot. quot is called with the pointer to the mapped memory wrapped in a specialized array of c-type.

Notes
The appropriate specialized array vocabulary must be loaded; otherwise, an error will be thrown. See the specialized-arrays vocabulary for details on the underlying sequence type constructed.

Definition

USING: alien.c-types alien.data kernel math ;

IN: gpu.buffers

:: with-mapped-buffer-array
    ( ..a buffer access c-type quot: ( ..a array -- ..b ) -- ..b )
    buffer buffer-size c-type heap-size /i :> len buffer access
    [ len c-type <c-direct-array> quot call ] with-mapped-buffer
    ; inline