| |
Flavioweb
Registered: Nov 2011
Posts: 463 |
FLD/FPP question.
I know how to delay char line visualization using FLD. I'm trying to do the same for every raster line. I tought to use something like FPP playing with D011 on cycle 58 and before 14 but i can't figure out if is possible to show gfx/char data during delay.
Can someone help me?
There is a way to stop vic updating internal gfx pointers at X rasterline, then delay the visualization to Y line and testart painting even if RC <> 7? |
|
... 23 posts hidden. Click here to view all posts....
|
| |
HCL
Registered: Feb 2003
Posts: 728 |
Hmm, feels like we hijacked the thread there, but.. I haven't checked, but i think it is done more or less like a fli-stretcher.. but without fli :P. That is, use all 8 bitmap banks, and let each bank represents one line within each 8-line chunk, so copy one bitmap line to all 8 lines in each bank. Then stretch each 8-line chunk by inserting new badlines -> restart display from the first line in 8-line chunk, until big enough to fit the distance of all 8 lines in the chunk. Meanwhile switch bitmap bank (with d018 and dd00) when desired plus switch d011 between bitmap mode and bla(n)k mode ($7x) to get empty lines inbetween the gfx. Comprende?
..in other words, not very straight forward, and not done in 5 minutes either -> no go ;) |
| |
Oswald
Registered: Apr 2002
Posts: 5094 |
urgh, thats some dirty business. |
| |
chatGPZ
Registered: Dec 2001
Posts: 11386 |
unless there is sideporder DYSP on top, who cares =P |
| |
Krill
Registered: Apr 2002
Posts: 2980 |
Quote: urgh, thats some dirty business.
I find the need to play that stupid "game" to reach the parts much dirtier. This and the fact that the demo, like a few of that era in Crest's history, comes on a disk personalized to select sceners. :) |
| |
Flavioweb
Registered: Nov 2011
Posts: 463 |
Quoting KrillI find the need to play that stupid "game" to reach the parts much dirtier.
Just press fire without move.
Then select parts from the menu.
=P |
| |
Flavioweb
Registered: Nov 2011
Posts: 463 |
Quoting HCL@Flavioweb: Doing FPD on a normal bitmap pic is not easy at all, assuming you are talking about bitmap as using more colors than 3+bg.. like in The Bubble Tale / Crest.
Thanks a lot for this one... and yes, i mean this.
I know that isn't easy but now i have some info to study...
I think my "missed thing" was to use "FLI organized bitmap".
Now i go to listening at the ingame music of the Crest's demo... it's awesome!!! |
| |
Krill
Registered: Apr 2002
Posts: 2980 |
Quote: Quoting KrillI find the need to play that stupid "game" to reach the parts much dirtier.
Just press fire without move.
Then select parts from the menu.
=P
Oh, i see. Also, on second thought, it seems that this demo wasn't released on personalized disks but merely not uploaded in mint condition. I withdraw earlier statements. :) |
| |
Flavioweb
Registered: Nov 2011
Posts: 463 |
About Crest's demo... i'm surprised to see that the fli-fpp routine was coded without stable raster at all...
just cycle-calculated code triggered by normal raster irq.
Fashinated... |
| |
Krill
Registered: Apr 2002
Posts: 2980 |
IIRC, FLI auto-stabilizes pretty much after the first line. This may be blacked out in the demo. Add a jmp * in the main loop, and you only have 3 cycles variance for the IRQ entry. Put a few sprites there, and it might get stabler.
There are many dirty ways and a bit of luck to get a stable raster, but the clean method is always superior and keeps you from stumbling over unpleasant surprises or weird bugs. :) |
| |
Flavioweb
Registered: Nov 2011
Posts: 463 |
I tought to code my versio of this fx over my stable raster routine because, my final goal, is to make it both pal/ntsc compliant and maybe works also on drean and others...
But first of all i need to exactly know how things works here, because a lot of things need to collime to make fx works. How and why ECM bit is used? Only to "blank" initial side effects or for more?
I know how to use the dma-delay to stabilize things... but here seems this is a very margnal question. A lot of D011 and bank switching trickery involved...
I think ECM is needed to compensate jitter side-fx on the standard irq call...
Let me study...
◑▂◐ |
| Previous - 1 | 2 | 3 | 4 - Next |
