******************************************************************************
D0h, forgot to remove a debug-call in the beginning of ClippedChunkyCircle
(and the ChunkyExample Executable), could trash your chipram. Sorry for that.
For most of the CircleFunctions you need a 68020 or higher,
i've included 68000-versions for those cases.
ChunkyExample now also only need 68000.
******************************************************************************
Update: 8 new variants for really big circles which need full clipping
Had bug in variant-checking when clipping MinX&MinY (only if both X and Y
would go negative), most variants in that case wouldn't be used.
There was one missing clipping for MaxY in a loop.
Included FullChunkyCircle.s if you just want a fast & small-circleroutine
without all the bells & whistles. :)
I put some more comments in ClippedChunkyCircle to make it easier to see
what part does what.
The ClipLine-function could also be used for blitter-lines.
I've included a ChunkyExample executable, which draws lines on top and
circles on the bottom half, you need the rtgmaster.library and a display
with chunky pixels (CybergraphX, Picasso96, and so on).
http://aminet.net/driver/video/rtgmaster_user.lha
******************************************************************************
After checking the rtgmaster.lib and doing a fix for it:
http://aminet.net/driver/video/rtgmaster_asmfix.lha
I noticed the functions it got where quiet slow, here are some functions
i wrote somewhere around 1994-95 and where used for example for EGSTurbo.
I've tuned them a bit for speed & high-resolution compability.
The Functions are:
******************************************************************************
in ChunkyMultab.s
MakeChunkyMultab *** creates the Multiplication Table for the Circle-Functions
Parameter: d0=pixelwidth
******************************************************************************
in ClippedChunkyCircle.s
ClippedChunkyCircle *** Draws a clipped circle
Parameter: a0=ChunkyScreen, d0=X, d1=Y, d3=Size (max 3840), d4=Color,
d5=pixelwidth, d6=pixelheight
Included special loops which for example only clip MinY & MinX, and if
both are negative will only try to draw lower right quadrant.
Total of draw-loops is 43 variants.
******************************************************************************
in ChunkyCircleQuadrant.s
ChunkyCircleQuadrant *** Draw a quadrant of a circle
Paramter: a0=ChunkyScreen, d0=X, d1=Y, d2=Quadrants, d3=Size, d4=Color,
d5=pixelwidth
Quadrant: 1=top right, 2=bottom right, 4=bottom left, 8=top left
ofcourse you can combine them 1+2 = right half of a circle
Both ClippedChunkyCircle.s & ChunkyCircleQuadrant.s include ChunkyMultab.s,
so if you want both remove one include.
You have to call MakeChunkyMultab width screenwidth in d0 once before using a
Circle-Function and when the screenwidth changes.
******************************************************************************
in ChunkyLine.s
ChunkyRectangle
Paramters: a0=ChunkyScreen, d0=x0, d1=y0, d2=x1, d3=y1, d4=Color,
d5=pixelwidth, d6=pixelheight
(without clipping pixelheight is not needed)
ChunkyLine
Paramters: a0=ChunkyScreen, d0=x0, d1=y0, d2=x1, d3=y1, d4=Color,
d5=pixelwidth, d6=pixelheight
(without clipping pixelheight is not needed)
if ChunkyLine.s defines:
CLIPLINES SET 1
then ClipLine.s will be included and called.
******************************************************************************
in ClipLine.s
ClipLine
Paramters: d0=x0, d1=y0, d2=x1, d3=y1, d5=pixelwidth, d6=pixelheight
Clips x0,y0,x1&y1 to the screenborders.
returns zero when the line should be drawn. i.e:
bsr ClipLine
bne.b SkipThisLine
...
******************************************************************************
Would be nice if you mention me when using these functions.
******************************************************************************
Check out my other tools:
http://aminet.net/search?readme=%22Holger+Hippenstiel%22&sort=date&ord=DESC
DISCLAIMER
This software is subject to the "Standard Amiga FD-Software Copyright
Note". It is Giftware as defined in paragraph 4g. If you like it and
use it regulary, please send me a small gift.
For more information please read "AFD-COPYRIGHT".
Diese Software unterliegt der "Standard Amiga FD-Software Copyright
Note". Sie ist Giftware wie definiert in Absatz 4g. Falls du sie magst
und regelmaessig benutzt, sende bitte ein kleines Geschenk.
Fuer mehr Informationen lies bitte "AFD-COPYRIGHT".
(/pub/aminet/docs/misc/AFD-FilesV-XX.lha V=Version,XX=Languages)
AUTHOR
Please send comments, bug-reports or small gifts or Paypal me to:
Holger.Hippenstiel AT gmx.de
Furtwanger Str. 14
71034 Böblingen
Germany
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