that took a few seconds to sink in but..yes, I see now.
On Fri, 27 Nov 2020 at 16:46, bill lam <bbill....@gmail.com> wrote:
> Well done!
>
> Sometimes I found it easier to read if negative index are used,
>
> 'rw rh' =. _2 _1 dmva sdl_getrenderoutputsize appr;(_1);(_1)
>
> On Sat, Nov 28, 2020, 12:19 AM emacstheviking <obji...@gmail.com> wrote:
>
> > 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 <bbill....@gmail.com> 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 <obji...@gmail.com>
> 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
> > > > )
> > > >
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