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- YP V0.98_BETA_1 (Wed 27-Aug-97) by Smack/Infect!
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- WARNING:
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- This YP version is my very first try to support CyberGfx.
- I don't have a CyberGfx system here so YOU are going to run virginal
- code! This fact is actually very unpleasant to me since there could be
- some obvious bugs which have had no chance to show up yet.
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- BUGREPORTS:
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- Please report any bugs (or what you might think that doesn't work right),
- but please don't write "Hey, your program crashes!" or something like that.
- Explain extactly what hardware, software and what kind of YAFA anim you
- used, and if possible send me some debugging output from YP itself and
- maybe from some other tools like Enforcer, Mungwall etc.
- I'm afraid this kind of "remote debugging" is going to be very nasty
- but I have no other chance. :-(
- Send bugreports to:
- epgbd@cluster.urz.uni-halle.de (attended about twice per week)
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- USAGE:
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- The new feature in this YP version is the explicit CyberGfx support.
- YP should now also run on non-AGA systems with CyberGfx installed.
- It works like this:
- -you need a Public Screen in a TrueColor CyberGfx screenmode
- (15, 16 or 24 bits deep). I guess 24 bits will be the fastest but
- you have to test this for yourself.
- -start YP in "pubscreen-window" mode like this:
- "yp_beta -ps XYZ test.yafa"
- (XYZ is the name of the above mentioned Public Screen; if the name is not
- correct then YP uses the Default Public Screen - usually Workbench)
- YAFA anims with PLANAR frames are currently NOT SUPPORTED in this mode!!
- Please tell me if this works as I think it should do, and also tell me
- about the playback speed so that I can see if all this work is really
- worth it...
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- TECH STUFF:
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- After reading some CyberGfx doc files I decided to use WritePixelArray()
- which is also used in some example code I found. Since YAFA anims can
- have a depth of 1-8, HAM6, HAM8, 15 or 24 bits I wrote some ASM routines
- that convert all these different YAFA pixel formats to 24 bits RGB.
- Maybe there is some other more elegant way to do this but I don't know it.
- WritePixelArray() can write only to TrueColor RastPorts when the input is
- RECTFMT_RGB, so YP requires a deep screen for the window. The advantage
- of this method is that the missing double buffering should be nearly
- invisible, even with YAFA anims that have palette-per-frame. The major
- disadvantage is probably speed...
- The timing is now done with CIA-A timer A (Level2 IRQ) because I read
- that VBlank IRQ doesn't work with CyberGfx. The base frequency of the timer
- is 50Hz so the playback speed is like on a PAL screen.
-