Hi,
On 11/1/20 4:54 PM, Nicolas Pomarède wrote:
Le 27/10/2020 à 00:12, Eero Tamminen a écrit :
Only "Susie" doesn't work, it's now stuck
executing these instructions:
$00016690 : btst #0,$fffffc00.w 50.00%
$00016696 : beq.s $16690 50.00%
Nicolas, any ideas what could be the problem?
if you look at the code after, you can see that the btst is in fact
waiting for a byte to be received from the ikbd ; which means a key
was pressed (or mouse was moved).
then just after, it compares the content of fffc02 with #$01, which
is the scancode for the 'esc' key.
So, demo is not stuck ; press 'esc' and it will continue. In fact it
exits. I don't know it's supposed to run sthg instead of exiting >
someone would need to test on a real falcon. (or look at the source code
with the demo)
"Susie" screen description states following:
--------------------------------------------
Wolfestein/doom routine. Trilinear filtering
(mipmaps!) and featuring anti-aliasing of wall
edges. The DSP is used just to do the 3d
mathematics. Uses blitter in a funny way to read
one pixel and write it twice, but this causes
problems with the sound DMA. Massive pre-
calculations. All wall heights are in memory.
Features a nice roll effect. 2x2 pixels, but
proper ultra-low resolution screen might speed
it up to 50hz. Truecolor.
--------------------------------------------
Which corresponds to attached image (susie-pouet.png) from pouet.net.
But it looks like the attached susie-hatari.png instead.
Maybe the blitter stuff is one of the problems?
I have no idea how that e.g. interacts with Videl emulation...
- Eero