Scaled Bitmap Sample

[toarnold]

Hi friends,

 

I get into difficulties displaying a scaled bitmap.

So I take a look into the WORKSHOP/SCALE sample. I got it compiled, but the result produces a black screen.

Can anybody provide me a working make file (with current tools for win32), or another working sample?

I tried smac/vlink. This combination works for the MOVE sample.

I checked the linking address for the scaled bitmap but it seems to be correct (dphrase aligend)

 

Thx,

toarnold

 

[toarnold]

Update: I tried rmac/rln. This did the trick. Now I try to find the differences.

 

Thx,

toarnold

[JagChris]

vlink requires '-minalign 4' in the options line. Without it one of the things that can happen is getting just a black blank screen. Not saying that was your problem but it may have been.

Edited June 13, 2015 by JagChris

[toarnold]

Hi JagChris,

 

this pointed me in the right direction. I wrote scaled bitmaps has to be dphrase aligned, but this is wrong, they has to be qphrase aligend (32byte boundary). Now this sample works with vlink, too.

 

THX

toarnold

[JagChris]

New information from Frank Wille.

 

 

 

 

The minimum instruction alignment for
m68k and Jaguar-RISC is both 2. And the 68000 doesn't benefit from 32-bit
aligned data, like the 68020.

When using a linker script, you should better insert ALIGN directives there
where you need them, instead of using a global -minalign option.

 

One man has run into debug problems with setting the minalign -4 option and the above is Frank's solution for it.

Edited November 24, 2015 by JagChris