Re: [pygame] MacOS/PyGame/PyOpenGL mouse inversion

["Dave LeCompte (really)" <dave@xxxxxxxxxxxx>]

"altern" wrote:
> No, it's a known (and resolved in later versions) bug in SDL.
> Workaround locally by flipping Y or use a later version.

My pygame.__version__ reports '1.8.0pre', which suggests to me that this
bug fix hasn't made it into the latest Mac binaries.


"altern" wrote:
> try to use glOrtho instead og gluOrtho2D and see if you still get the same
> # glOrtho(left, right, bottom, top, zNear, zFar)
> glOrtho(0, 640, 480, 0, 1, 0) should set 0,0 to the left,top

Replacing glOrtho with glOrtho2D produced identical results on all
platforms, including the inconsistency on the Mac when windowed.


Thanks for the help.
-Dave LeCompte


>
>
>
> Chris Ashurst wrote:
>> I think on all systems (and if you're used to getting mouse x/y
>> coordinates
>> via the SDL side of pygame) the mouse is "flipped" when you use OpenGL.
>>
>> I think it's something to do with the fact that OpenGL itself is device
>> and
>> system agnostic, and was built with the idea in mind that it's just a 3d
>> engine rather than a 3d engine + widgets.
>>
>> Additionally, it may also be something to do with the fact that any
>> object
>> you manipulate in an OGL context is relative to the "camera", and to
>> move
>> the camera around an object you have to move it right if you want the
>> object
>> to move left, up to move it down and so on.
>>
>> People with more experience with OpenGL can probably clarify, but I have
>> hit
>> this same issue before, too. I think the x coord turned out to be fine,
>> all
>> I needed to do was write a function that inverted the y coordinate to
>> get
>> the "real" value.
>>
>> -----Original Message-----
>> From: owner-pygame-users@xxxxxxxx [mailto:owner-pygame-users@xxxxxxxx]On
>> Behalf Of Dave LeCompte (really)
>> Sent: Tuesday, January 16, 2007 20:20
>> To: pygame-users@xxxxxxxx
>> Subject: [pygame] MacOS/PyGame/PyOpenGL mouse inversion
>>
>>
>> Hi there, I'm new to the list, so this may have been answered before.
>>
>> I've got a PyGame/PyOpenGL app that I'm working on which I can run under
>> MSWindows or Mac OSX and in windowed or fullscreen mode. I notice that
>> when I run in a window on my Mac, the value returned by
>> pygame.mouse.get_pos() is relative to the lower left corner of the
>> screen,
>> but if I run fullscreen on the Mac, fullscreen on by Windows PC, or in a
>> window on the Windows PC, the value is relative the the upper left
>> corner
>> (agreeing with the docs at
>> http://www.pygame.org/docs/ref/mouse.html#pygame.mouse.get_pos ).
>>
>> Is this a known issue?
>>
>> Attached is a short test script that displays the strange behavior.
>>
>> -Dave LeCompte
>>
>>
>>
>>
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