Final more J-like solution to my problem, thanks bill Iam for the nudge...
dmva =: 4 : '''''&$ each (x{y)'
This allows me to specify the actual array positions I want de-arrayed /
scalerised and feels much more natural in use as I can now specify any
number of positions and of course re-order things too. Probably the only
improvement now is the name!
'rw rh' =. 2 3 dmva sdl_getrenderoutputsize appr;(_1);(_1)
I appreciate that ''$ is only producing scales because the first atom of my
array contains a scalar. I think. !
Thanks all once again,
Sean.
On Fri, 27 Nov 2020 at 13:05, bill lam <[email protected]> wrote:
> probably your width and height are not scalar but singleton array. you can
> check them with monad $ .
>
> On Fri, Nov 27, 2020, 8:00 PM emacstheviking <[email protected]> wrote:
>
> > Given these working external function declarations:
> >
> > SDL_GetWindowSize n x *i *i
> > SDL_GetRendererOutputSize n x *i *i
> > SDL_CreateRGBSurface > x i i i i i i i i
> >
> > then these two calls:
> >
> > 'ww wh'=:2}.sdl_getwindowsize appw;(,_1);(,_1)
> > 'rw rh'=:2}.sdl_getrendereroutputsize appr;(,_1);(,_1)
> >
> > work and produce values of 1024 for ww and rw, and 768 for wh and rh
> > respectively, as expected.
> > However, when creating the rgb surface it raises a domain error and I
> have
> > been tearing my hair out to understand why.
> > I have posted the full code at the end of this plea for help and
> > enlightenment.
> >
> > args=.0;width;height;32;16bff0000;16bff00;16bff;16bff000000
> > smoutput args
> > sfc=: sdl_creatergbsurface args
> >
> > cder''
> > 6 1
> >
> > yet calling it with literals or even the extracted 'y' value (a boxed
> > dimension):
> > args=.0;1024;768;32;16bff0000;16bff00;16bff;16bff000000. NB. works
> > args=.0;width;height;32;16bff0000;16bff00;16bff;16bff000000. NB. works
> >
> > I have used 3!:0 to examine the type, it is 4 (integer) in all cases
> > (ww,wh,rw,rh,width,height), ruling out those errors.
> > Thanks,
> > Sean. :|
> >
> > -- full code ---
> >
> > ugo =: 3 : 0
> > NB. testing out domain errors around sdl_creatergbsurface...
> > args =. SCREEN_X_MAX;SCREEN_Y_MAX
> > scrw =. SCREEN_X_MAX
> > scrh =. SCREEN_Y_MAX
> > sdlprep scrw;scrh
> > cairoprep''
> > urun''
> > uend^:y ''
> > )
> >
> > sdlprep =: 3 : 0
> > 'width height'=. y
> > sdl_init SDL_INIT_EVERYTHING
> > appw=:sdl_createwindow 'test window';0;0
> > ;width;height;SDL_WINDOW_SHOWN+SDL_WINDOW_ALLOW_HIGHDPI
> > appr=:sdl_createrenderer appw;_1
> > ;SDL_RENDERER_ACCELERATED+SDL_RENDERER_PRESENTVSYNC
> > 'ww wh'=:2}.sdl_getwindowsize appw;(,_1);(,_1)
> > 'rw rh'=:2}.sdl_getrendereroutputsize appr;(,_1);(,_1)
> > cxm=: rw % ww
> > cym=: rh % wh
> > smoutput 'window: ', (":appw), 'renderer:', (":appr)
> > smoutput 'requested width:',(":width),' height:',(":height)
> > smoutput 'render width: ',(":rw),' height:',(":rh)
> > smoutput 'window width: ',(":ww),' height:',(":wh)
> > smoutput 'x/y multipliers:',(":cxm),'/',(":cym)
> > NB. This needs to be endian-aware at some point
> > smoutput (": (width = rw))
> > args=.0;width;height;32;16bff0000;16bff00;16bff;16bff000000
> > smoutput args
> > sfc=: sdl_creatergbsurface args
> > NB. Practice structures. PACKING!!! Show printable format name
> > pFormat=._3 ic memr (sfc+8),0,8 NB. sdl_surface->format
> > format=._2 ic memr pFormat,0,4 NB. sdl_surface->format->format
> > smoutput 'pixel format:',(psz sdl_getpixelformatname format)
> > EMPTY
> > )
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> >
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
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