Help for VGA driver 512x384 and graphics.spin

Marc71

Hello!
I ask you the following help.
how you can successfully use the graphics library with the original driver vga512x384 parallax parallax. what changes should make it to work properly.
how can you create an assembler routine plot driver for the following example:
with spin pixels [y + x +16>> 5], but with assembler?
this to speed up the tracking pixel
thanks.
Marc71

Marc71

Hello!

Having been approached recently about programming the propeller, I thought that you could seek help from experts who continually write in this forum, I was hoping at least one answer.

I hope at least that arrives from parallax.

Thank you!

Marc71

kuisma

          mov  foo,y
          add  foo,x
          add  foo,#16
          shr  foo,#5

Does this really makes you happy?

Baggers

kuisma, I think Marc71 had a typo in his calculation

pixels[y<<4 + x>>5] |= |< x

translates to something like this in pasm.

sub plotsetup
  pixelbase := @pixels

dat
org 0
'test plot
entry 
  mov xpos,#256
  mov ypos,#192
  call #plot
'done test plot make cog wait forever
forever jmp #forever

'this is the actual plot in pasm
Plot
  cmp xpos,#511 wc,wz
if_a jmp #plot_ret
  cmp ypos,#383 wc,wz
if_a jmp #plot_ret
  mov plottmp1,ypos
  shl plottmp1,#4
  mov plottmp2,xpos
  shr plottmp2,#5
  add plottmp1,plottmp2
  mov plottmp2,#1
  add plottmp1,pixelbase
  rdlong plottmp3,plottmp1
  shl plottmp2,xpos
  or plottmp3,plottmp2
  wrlong plottmp3,plottmp1
plot_ret ret

pixelbase res 1
plottmp1 res 1
plottmp2 res 1
plottmp3 res 1
xpos res 1
ypos res 1

kuisma

I'm sure, Baggers.

Mark71, to get good answers (opposite mine), you have to formulate your question more precise. I really have no idea what to answer your question. Sorry.

Marc71

thanks, Kuisma and Baggers for the answer!

Sorry if I was not very precise in formulating the question.

The problem is:

with the parallax driver vga 512x384 2-color, the library graphics.spin does not work.

because it manages the 4-color mode.

as it should be changed.

or

a function of plot with assembler.

in part, have already been answered.

thanks.

marc71

Baggers

You're welcome Mark71,
don't forget to post it working plus source when you've finished

Ariba

Have a look at this old thread: http://forums.parallaxinc.com/forums/default.aspx?f=25&m=146237

Andy