Just to expand a little on this:
glDrawPixelsXX previously was working on the assumption that the
graphics passed to it were stored such that array[0] was the first
row. This meant that if you did array.tostring() and passed the
array dimensions in to glDrawPixels you would wind up with a trashed
image (since Numpy packs arrays to strings from the lowest dimension
up). By switching to assuming that array[0] gives the first column
of the image (that is, that the first dimension represents the index
*into* the first row), we are basically using the natural order of
the array and also making the two types of glDrawPixels calls match
up as expected; so that array[20,30] is the pixel twenty from the
right and 30 from the bottom, and dumping to a string and passing
array dimensions works the same as passing in the array.
I've so far come across 1 instance of an incompatibility in
OpenGLContext. It actually turned out to be quite nasty (the
work-around works fine, but figuring out how to eliminate the huge
series of convolutions through which the code goes at the moment has
been a bit of a pain...).
Have fun all,
Mike
Mike C. Fletcher wrote:
> I've just checked in changes on the 2.0.1 maintenance branch that fix
> a bug in how glDrawPixelsXX (that is, all glDrawPixels calls which
> take an array argument, rather than a string) operates. The code was
> previously (unintentionally) reversing the first and second arguments,
> so that it would take (height,width) rather than (width,height) from
> the array to decide how to render it.
>
> If you have any code that uses glDrawPixelsXX you will find that this
> fix causes your code to stop working. Solution is simply to use
> properly-sized arrays (i.e. if you want an image 300x100 pixels wide
> it's shape should be (300,100,depth), rather than (100,300,depth)).
> If you can't make that change, then simply assigning array.shape =
> (array.shape[1],array.shape[0]) + array.shape(2:]) will allow you to
> continue operating as before.
>
> This bug does not affect string-based glDrawPixels calls.
>
> Enjoy yourselves,
> Mike
________________________________________________
Mike C. Fletcher
Designer, VR Plumber, Coder
http://www.vrplumber.com
http://blog.vrplumber.com
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