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

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

To clarify:

glOrtho and gluOrtho2D behave identically to eachother - switching to
glOrtho didn't fix the problem. I have since created a wrapper to work
around the bug when running in a window on the Mac.

Thanks again,
Dave LeCompte


> "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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>>
>