Device in fullscreen 16:9

[Gendo Ikari]

How to make Irrlicht working with 16:9 output?

[Steel Style]

It's will work without any modification but if I'm right you're talkin about ratio. So it's simple : camera->setAspectRatio(16.0f/9.0f);

[Gendo Ikari]

When I create device with a different resolution in fullscreen, irrlicht crash.

Code: Select all

dimension2d<s32> tmpRes;
tmpRes.Width=1024;
tmpRes.Height= floor(tmpRes.Width/16*9);
device = createDevice(tmpDriver,tmpRes,tmpBits, true,true,true,&events);

[Valmond]

just my 2 cent:

Code: Select all

tmpRes.Height= floor(tmpRes.Width/16*9); 

might be equal to:

Code: Select all

tmpRes.Height= floor(tmpRes.Width/ (16*9) );

try

Code: Select all

tmpRes.Height= floor((tmpRes.Width/16)*9); 

or better

Code: Select all

tmpRes.Height= floor((tmpRes.Width*9)/16);

[Gendo Ikari]

All lines have the same meaning. X*Y/Z = (X*Y)/Z = X*(Y/Z) = X*Y*(1/Z).
However thank you, i've tried but same error

[Sylence]

Try it with fixed number.

[DeM0nFiRe]

All lines have the same meaning. X*Y/Z = (X*Y)/Z = X*(Y/Z) = X*Y*(1/Z).
However thank you, i've tried but same error

There is a difference, however, between

X/(Y*Z) and (X/Y)*Z. You want to multiply the width by 9 and then divide it by 16. Because the ration is Width/Height = 16/9. Solve for wight and you get (9 * Width)/16 = Height. I think the order of operations in this case may have made it work out, but it's worth a try, anyway.

[CuteAlien]

I suppose you can only use resolutions which are actually offered by the system. So probably the resolution you try does not exist.

Still it shouldn't crash imho... that sounds wrong. But I can reproduce it on Linux - or well, due to the difficulty of debugging fullscreen I'm not even sure what exactly happens as all I get is a messed up screen and the only way to get rid of it was restarting X *sigh*. Can't do more tests right now due to missing time.

On which system did you test?

[Brainsaw]

I agree with CuteAlien. You should not try to set a fullscreen resolution that you graphics card does not support. You could either

- use a fixed value (e.g. 640x480) or
- use IrrlichtDevice::getVideoModeList to find out which fullscreen resolutions your graphics card supports

I use the second method and a lot of modes that my notebook supports are unsupported by my desktop.

[Gendo Ikari]

Thank you very much, i think this: IrrlichtDevice::getVideoModeList, its foundamental!
I'll test.
My development environment its a WinXp SP3 with Ati 4850, compiled with CodeGear Rad Studio 2009.

EDIT:
But getVideoModeList is a method of IrrlichDevice. So do i need to create device with a standard resolution, than check video mode, and than destroy and create again device?

[mk.1]

There is a "null device"

[Gendo Ikari]

Is a null-device expensive regard memory and cpu?

[vitek]

Is a null-device expensive regard memory and cpu?

It doesn't matter. You just create a null device instance so that you can get the video mode list without creating an Irrlicht window. Once you've got the video mode list, you can destroy the null device and create a D3D or OpenGL device.

Travis

[Brainsaw]

@Gendo Ikari: I don't use the NULL device in that place. Before starting my game the user gets a window where he can choose the resolution (and the options for device creation) that is always started with the Software Renderer.

[Gendo Ikari]

Yeah, i've resolved the problem doing this. Now the user can change resolution, and all goes well. Thank you very much.

EDIT:

why this error happen if I drop the null device?


Assertion failed: !(ReferenceCounter <= 0), file (...)\irrlicht-1.5\include\IReferenceCounted.h, line 119