OpenGL. arrays. _strings

Run-time calculation of offset into Python string structure

Does a scan to find the digits of pi in a string structure in order to produce an offset that can be used to produce data-pointers from Python strings.

Porting note:

Currently this uses id( str a ) to get the base address of the Python string. Python implementations where id( a ) is *not* the memory address of the string will not work!

Functions

calculateOffset( )

Calculates the data-pointer offset for strings

This does a sequential scan for 100 bytes from the id of a string to find special data-value stored in the string (the digits of PI). It produces a dataPointer function which adds that offset to the id of the passed strings.

dataPointer( data )

Return the data-pointer from the array using calculated offset

data: a Python string

Returns the raw data-pointer to the internal buffer of the passed string

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OpenGL. arrays. _strings

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