fullscreen drawing area and ofGetWidth() does not match

beginners
#1

hi

i noticed that if i set my app to fullscreen then if i ask for ofGetWidth() or ofGetHeigth() I dont get the rendering area size but the one hardcoded in file main.cpp. In my case even if my screen resolution is 1024x768 and I open my app fullscreen the command ofGetWidth() returns 800 which is the size typed in main.cpp
ofSetupOpenGL(&window, 800,600, OF_WINDOW);

I know i could use ofGetScreenWidth() and ofGetScreenHeight() but isnt this a kind of bug? I mean, should not OF internaly match the new drawing area since the description of ofGetWidth() says :

The width of the window expressed in pixels. Doesn’t include the borders of the window, just the drawing area.

or maybe i am missig something??

thanks

enrike

#2

afaik, the designed behaviour for fullscreen is to resize the desktop display to the requested width and height. for example, if my monitor is 1920x1080 it’s important that i can resize in code to 800x600 to avoid nasty fill-rate issues.

are you sure your display isn’t switching to the requested resolution when you go fullscreen? if it’s not, it should. are you on Linux?

#3

no it is not changing the screen resolution. i am on windows XP on a IBM X32 laptop with ATI mobillity radeon card. i just did the same test under linux (ubuntu karmic) and i get the same result. maybe i am missing something?

i am doing this on setup()

  
  
void testApp::setup()  
{  
    ofSetFullscreen(1);  
    printf( "%i, %i, %i, %i", ofGetWidth(), ofGetHeight() ofGetScreenWidth(), ofGetScreenHeight() );  
}

and made sure that main.cpp says

  
  
	ofSetupOpenGL(&window, 800,600, OF_WINDOW);

and it prints “800, 600, 1024, 768”

i tested it with the empty example to make sure i wasnt doing something wrong somewhere else.

i need to be able to specify in an xml file, using XML addon, if the app should open fullscreen or not. Then later i am using ofGetWidth(), ofGetHeight() to resize some media to fill the whole screen. At the moment i am getting OF fullscreen (1024x768) but then the videos get opened with 800x600 size.

thanks

enrike

#4

aah, i see.

i think you need to be calling

  
ofSetupOpenGL(&window, 800,600, OF_FULLSCREEN);

from there you should be able to turn fullscreen off if necessary.

alternatively, i think you should be able read the res/fullscreen settings from your xml file in the main.cpp, using ofxXmlSettings, and pass them to the ofSetupOpenGL call.

#5

changing that does not make any difference. I still get printed
“800, 600, 1024, 768” from the setup function
printf( “%i, %i, %i, %i”, ofGetWidth(), ofGetHeight() ofGetScreenWidth(), ofGetScreenHeight() );

as you pointed out the problem is that it is not actually changing the display resolution, it should match the size passed to the ofSetupOpenGL as far as I understand. I think this should be done by GLUT.

#6

I think the thing is that on the “setup” frame, we don’t know the actual size of a fullscreen window. can you try printing the info in update and draw as well and see what they say?

take care,
zach

#7

you are right, printing from update shows the right values. good to know (maybe something to add in the docs?)

thanks!