Blitter problem

zeGouky · 23 March 2014, 16:07

Hello all,

I'm currently doing some coding on my amiga and trying to remember things (btw Photon video series are great !) and I'm having troubles with blitting a 240x16x4 pic with the blitter but not sure what i'm doing wrong ..

Basically here's the blitting code :

Code:

TilesW=240
TilesH=16
TilesBplCount=4
TilesBpl=TilesW/8

ScrBpl = 320/8

; Waitting blitter ...

; Doing blitting
move.l #$09f00000, $dff040
move.l #$ffffffff, $dff044
move.l #Tiles, $dff050
move.l #Screen, $dff050
move.w #TilesBpl, $dff064
move.w #(ScrBpl-TilesBpl), $dff066
move.w #((TilesH*TilesBplCount)<<6)+TilesW/16, $dff058


; copper stuff
dc.w $108, (320/8*4)-(320/8)
dc.w $10a, (320/8*4)-(320/8)

dc.w $100, $4200

The result seems like fucked up bitplanes and 32 pixels in height.
I'm sure it's a silly/tiny thing that's I'm missing ...

Thanks for the help!

zeGouky · 23 March 2014, 16:20

ok nvm found it ... going to throw myself to a wall

Lonewolf10 · 25 March 2014, 12:46

Quote:

Originally Posted by zeGouky

ok nvm found it ... going to throw myself to a wall

Hehe, had a problem in my code regarding flickering sprites - despite the fact I was using double buffering!! It turned out that I was moving the sprite off the screen accidentally on certain frames.
I've also made silly mistakes when using the blitter before. The life of a programmer, huh?

zeGouky · 25 March 2014, 12:51

hehe yep

But I really hate that kind of moment where you spend hours on a problem without finding what's wrong, but you are sure that's a silly thing then ask for some help and ... the second after you are like "FUUUUCK" when reading your message

Steve · 25 March 2014, 17:52

and the problem was??

zeGouky · 25 March 2014, 17:54

blitter modulo for source A was not set correctly. I was adding 160bytes while i was blitting the full screen

phx · 26 March 2014, 13:19

And I thought it was this:

Code:

    move.l #Tiles, $dff050
    move.l #Screen, $dff050

Putting both pointers into BLTAPT?

zeGouky · 26 March 2014, 14:12

Was a wrong copy from my amiga screen ^^

23 March 2014, 16:07	#1
zeGouky Registered User Join Date: Oct 2005 Location: Edinburgh Age: 43 Posts: 84	Blitter problem Hello all, I'm currently doing some coding on my amiga and trying to remember things (btw Photon video series are great !) and I'm having troubles with blitting a 240x16x4 pic with the blitter but not sure what i'm doing wrong .. Basically here's the blitting code : Code: TilesW=240 TilesH=16 TilesBplCount=4 TilesBpl=TilesW/8 ScrBpl = 320/8 ; Waitting blitter ... ; Doing blitting move.l #$09f00000, $dff040 move.l #$ffffffff, $dff044 move.l #Tiles, $dff050 move.l #Screen, $dff050 move.w #TilesBpl, $dff064 move.w #(ScrBpl-TilesBpl), $dff066 move.w #((TilesHTilesBplCount)<<6)+TilesW/16, $dff058 ; copper stuff dc.w $108, (320/84)-(320/8) dc.w $10a, (320/8*4)-(320/8) dc.w $100, $4200 The result seems like fucked up bitplanes and 32 pixels in height. I'm sure it's a silly/tiny thing that's I'm missing ... Thanks for the help!

25 March 2014, 17:54	#6
zeGouky Registered User Join Date: Oct 2005 Location: Edinburgh Age: 43 Posts: 84	blitter modulo for source A was not set correctly. I was adding 160bytes while i was blitting the full screen Last edited by zeGouky; 25 March 2014 at 18:01. Reason: more specific

26 March 2014, 13:19	#7
phx Natteravn Join Date: Nov 2009 Location: Herford / Germany Posts: 2,500	And I thought it was this: Code: move.l #Tiles, $dff050 move.l #Screen, $dff050 Putting both pointers into BLTAPT?

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23 March 2014, 16:20	#2
zeGouky Registered User Join Date: Oct 2005 Location: Edinburgh Age: 43 Posts: 84	ok nvm found it ... going to throw myself to a wall

25 March 2014, 12:51	#4
zeGouky Registered User Join Date: Oct 2005 Location: Edinburgh Age: 43 Posts: 84	hehe yep But I really hate that kind of moment where you spend hours on a problem without finding what's wrong, but you are sure that's a silly thing then ask for some help and ... the second after you are like "FUUUUCK" when reading your message

25 March 2014, 17:52	#5
Steve I Identify as an Ewok Join Date: Jul 2001 Location: North Lincolnshire Age: 45 Posts: 2,356	and the problem was??

26 March 2014, 14:12	#8
zeGouky Registered User Join Date: Oct 2005 Location: Edinburgh Age: 43 Posts: 84	Was a wrong copy from my amiga screen ^^

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