Landscape mode problem on iPhone

[Adversus]

Hi Guys,

I'm trying to fix the bug due to the landscape mode in my game.

Basically even though the Windows and iPhone version are identical I need to do:

Code: Select all

// landscape mode
#if defined( GR_IPHONE_DEVICE )
	core::matrix4 landscapeMatrix;
	landscapeMatrix.setRotationDegrees( core::vector3df(0.0, 0.0, -90.0) );
	driver->setTransform(video::ETS_PROJECTION, ViewArea.Matrices[video::ETS_PROJECTION]*landscapeMatrix );
				#else
	driver->setTransform(video::ETS_PROJECTION, ViewArea.Matrices [ video::ETS_PROJECTION ] );
#endif

And while this works and it gives me a landscape it doesn't work exactly. The iPhone version looks a little zoomed in. I think this is due to having to pass the screen dimensions into glViewport and during the creation of the Window as they are different due to the fact the Windows one is "true" landscape while the iPhone one is "faked" using a rotated projection matrix.

For reasons specific to my type of game this is now causing issues.

I can't simply swap the values around in glViewport as then I don't fill the screen and I'm not sure mathematically how to fix this.

Does anyone have a solution?

Cheers,
Adversus

[BlindSide]

Maybe it's related to the aspect ratio?

[FuzzYspo0N]

The iPhone VIEW (key word for looking in the iPhone docs) is a UIView component, rotate that instead and use 480x320. That will also handle when you want to use autorotation or device orientation notification rotations.

Inside the iPhone driver theres a UIView, in the initialisation, just change its rotation.

[Adversus]

I tried swapping the width and height for the aspect ratio however it now looks like the field of view is right i.e. an object looks the same distance away however it also gives a weird stretching effect. The vertical is squashed showing more and the horizontal is stretched showing less if that makes sense.

I can't just rotate the UIView, it's slow because it has to be done by coreAnimation and they recommend you do it by rotating the projection matrix instead.

[sudi]

I tried swapping the width and height for the aspect ratio however it now looks like the field of view is right i.e. an object looks the same distance away however it also gives a weird stretching effect. The vertical is squashed showing more and the horizontal is stretched showing less if that makes sense.

I bet you are doing the same i did...when assigning the AspectRatio make sure you are deviding floats and not ints!!!! this easy bug gave me a lot of trouble.

[Adversus]

I wish it was that easy

Nope here's my code in the camera

Code: Select all

video::IVideoDriver* d = mgr->getVideoDriver();
if (d)
 Aspect = (f32)d->getCurrentRenderTargetSize().Width/(f32)d->getCurrentRenderTargetSize().Height;