May 2007 - Fractdev - mailman.xmission.com

official fractint subversion respository
by Tim Wegner 21 May '07

21 May '07

Everyone has global read access via a subversion server at: http://fractint.net/fractsvn I am the only one who can commit via the server (not that I will). Those with shell accounts can access the repository (read and write) at: /home/twegner/svn/fractsvn Let me know if there are any permission problems. I have backed up but not disabled the CVS repository. Please do not commit. I'll disable it for writing as soon as it appears everything is OK. Tim

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bit 2 of user float flag
by Richard 21 May '07

21 May '07

There is some coe in line3d.c that sets and clears this bit, but apparently noone else pays attention to it except as a side effect of comparing user float flag to 1 or 0. What's the purpose of this second bit? Otherwise user float flag looks like a boolean. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

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[xy]_{min,max} sure, but [xy]_3rd?
by Richard 13 May '07

13 May '07

What is the purpose of the XXX_3rd variables? They seem related to one of the corners of the complex plane where the fractal is computed, but I don't see anything that explains its relation or purpose to the min/max variables. "3rd" doesn't convey any meaning. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

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DOS Fractint rendering error
by Hal Lane 12 May '07

12 May '07

======================================================= DOS Fractint error. Horizontal streaks in fractal in View Window. This is a zoom out to the parent fractal of Jim Muth's FOTD 07-05-09 displayed in a View Window. As the View Window size is increased by changing the Size Reduction Factor from 8 to 6 to 4 the number of horizontal streaks decreases. The fractal calculates correctly when the View Window is turned off. Parm file is below. I use the View Window a lot, but I don't see this too often. I had thought that passes=1 kept these streaks from appearing... Does anyone have any ideas what causes these horizontal streaks when using the View Window and how to avoid them? - Hal Lane ######################### # hallane(a)earthlink.net # ######################### BEGIN PARAMETER FILE========================================= ImagInterlude_Err { ; Hal Lane 07-05-09 3.3 P400 128x96 ; DOS Fractint error. Horizontal streaks ; in fractal in View Window. Zoom out to ; parent fractal of Jim Muth's FOTD 070509 reset=2004 type=formula formulafile=_m.frm formulaname=mandautocritinz function=recip passes=1 center-mag=3.63798e-012/-1.81899e-012/6.832e-005 params=-5/-1.1/-1/-5.5/0/-40/0/0 float=y maxiter=1600 inside=fmod proximity=1 periodicity=10 viewwindows=8/0.75/yes/0/0 sound=off colors=000WY8WZ4<2>HCE<2>GEJGFKEEo<3>8Ni7Ph5Rg<2>1Xc<3>\ 6gf7jg8lg<2>Bti<8>BRoBOpBLq<3>B8s<5>UHnYJm`Kl<3>lQiQV5<\ 3>dQNhPRlOWpN_sMc<3>lSbjTbiUa<2>dYabZa`aZ<3>dVieTlfSngQ\ qhOtgLy<7>lUflVdmWb<3>o_UrcR<7>aNW_LXYJX<2>SDZQB_MGKO9_\ <3>U7ZV7Z000QSq<3>DEmAAl76k43j<2>25N25G38F<3>7JC8LB9OAA\ RABTA<3>FdUGgZGjcHmhIpm<2>JzzUWV<2>z8f<3>bMYXPWRSU<2>Aa\ O<3>JhVLjXOkYQm_wzaUpbWrdzzzXqb<6>VgNUeKUdI<3>TZ9<4>TUC\ TTDTSD<2>TPFTOFVQD<4>__7`a6ac5<3>ej0<3>mT1oP1qL1<2>w81<\ 3>u67t69t6A<8>e9ccAgaAj<2>XBtWBwWDr<8>WUG000 } frm:MandAutoCritInZ {; Jim Muth a=real(p1), b=imag(p1), d=real(p2), f=imag(p2), g=1/f, h=1/d, j=1/(f-b), z=(((-a*b*g*h)^j)+(p4)), k=real(p3)+1, l=imag(p3)+100, c=fn1(pixel): z=k*((a*(z^b))+(d*(z^f)))+c, |z| < l } END PARAMETER FILE========================================= No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.467 / Virus Database: 269.6.8/797 - Release Date: 5/10/07 5:10 PM

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Use of filetype?
by Richard 05 May '07

05 May '07

I see the variable filetype initialized to 0 in loadfile.c and there's a comment there saying that when 0 its for GIF files. Later in framain2.c, there's a comparison suggesting that values >= 1 are "old .tga format input file", where outline is assigned to outline16. Later, there's another check on this variable changing the argument to funny_glasses_call, with either gifview (filetype = 0) or tgaview (filetype != 0). However, there is nowhere in the code (.c or .asm) where filetype is assigned a value larger than 1. Is this dead code? This is the only place that tgaview appears to be refenced. > find "filetype" common\*.c dos\*.c dos\*.asm headers\*.h ---------- COMMON\3D.C ---------- COMMON\ANT.C ---------- COMMON\BIGFLT.C ---------- COMMON\BIGINIT.C ---------- COMMON\BIGNUM.C ---------- COMMON\BIGNUMC.C ---------- COMMON\CALCFRAC.C ---------- COMMON\CMDFILES.C ---------- COMMON\DECODER.C ---------- COMMON\DISKVID.C ---------- COMMON\EDITPAL.C ---------- COMMON\ENCODER.C char openfile[FILE_MAX_PATH], openfiletype[10]; strcpy(openfiletype, DEFAULTFRACTALTYPE); /* determine the file strcpy(openfiletype, ".pot"); strcpy(openfiletype, period); strcat(openfile, openfiletype); ---------- COMMON\EVOLVE.C ---------- COMMON\F16.C ---------- COMMON\FRACSUBR.C ---------- COMMON\FRACTALB.C ---------- COMMON\FRACTALP.C ---------- COMMON\FRACTALS.C ---------- COMMON\FRACTINT.C ---------- COMMON\FRAMAIN2.C else if(filetype >= 1) /* old .tga format input file */ if(filetype == 0) ---------- COMMON\FRASETUP.C ---------- COMMON\GIFVIEW.C ---------- COMMON\HCMPLX.C ---------- COMMON\HELP.C ---------- COMMON\HISTORY.C ---------- COMMON\INTRO.C ---------- COMMON\JB.C ---------- COMMON\JIIM.C ---------- COMMON\LINE3D.C if (filetype || pot16bit) /* don't truncate fractional ---------- COMMON\LOADFDOS.C ---------- COMMON\LOADFILE.C int filetype; filetype = 0; /* GIF */ ---------- COMMON\LOADMAP.C ---------- COMMON\LORENZ.C ---------- COMMON\LSYS.C ---------- COMMON\LSYSF.C ---------- COMMON\MEMORY.C ---------- COMMON\MISCFRAC.C ---------- COMMON\MISCOVL.C ---------- COMMON\MISCRES.C ---------- COMMON\MPMATH_C.C ---------- COMMON\PARSER.C ---------- COMMON\PARSERFP.C ---------- COMMON\PLOT3D.C ---------- COMMON\PRINTER.C ---------- COMMON\PROMPTS1.C ---------- COMMON\PROMPTS2.C ---------- COMMON\REALDOS.C ---------- COMMON\ROTATE.C ---------- COMMON\SLIDESHW.C ---------- COMMON\SOI.C ---------- COMMON\SOI1.C ---------- COMMON\STEREO.C ---------- COMMON\TARGA.C ---------- COMMON\TESTPT.C ---------- COMMON\TGAVIEW.C ---------- COMMON\YOURVID.C ---------- COMMON\ZOOM.C ---------- DOS\SOUND.C ---------- DOS\TPLUS.C ---------- DOS\UCLOCK.C ---------- DOS\BIGNUMA.ASM ---------- DOS\CALCMAND.ASM ---------- DOS\CALMANFP.ASM ---------- DOS\CALMANP5.ASM ---------- DOS\FPU087.ASM ---------- DOS\FPU387.ASM ---------- DOS\FR8514A.ASM ---------- DOS\FRACSUBA.ASM ---------- DOS\GENERAL.ASM ---------- DOS\HGCFRA.ASM ---------- DOS\LSYSA.ASM ---------- DOS\LSYSAF.ASM ---------- DOS\LYAPUNOV.ASM ---------- DOS\MPMATH_A.ASM ---------- DOS\NEWTON.ASM ---------- DOS\PARSERA.ASM ---------- DOS\TPLUS_A.ASM ---------- DOS\VIDEO.ASM ---------- HEADERS\BIG.H ---------- HEADERS\BIGINIT.H ---------- HEADERS\CMPLX.H ---------- HEADERS\DIALOG.H ---------- HEADERS\DOSPROT.H ---------- HEADERS\EXTERNS.H extern int filetype; ---------- HEADERS\FMATH.H ---------- HEADERS\FRACTINT.H ---------- HEADERS\FRACTYPE.H ---------- HEADERS\HELPCOM.H ---------- HEADERS\HELPDEFS.H ---------- HEADERS\LSYS.H ---------- HEADERS\MATHTOOL.H ---------- HEADERS\MPMATH.H ---------- HEADERS\PORT.H ---------- HEADERS\PROFILE.H ---------- HEADERS\PROTOTYP.H ---------- HEADERS\SELECT.H ---------- HEADERS\TARGA.H ---------- HEADERS\TARGA_LC.H ---------- HEADERS\TPLUS.H ---------- HEADERS\UCLOCK.H ---------- HEADERS\UNIX.H ---------- HEADERS\UNIXPROT.H ---------- HEADERS\WINFRACT.H ---------- HEADERS\WINPROT.H -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

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jb.c, line 85: min-max instead of max-min?
by Richard 05 May '07

05 May '07

In jb.c, there is this code: 80: xoffsetfp = (xxmax + xxmin) / 2; /* Calculate average */ 81: yoffsetfp = (yymax + yymin) / 2; /* Calculate average */ 82: dmxfp = (mxmaxfp - mxminfp) / zdots; 83: dmyfp = (mymaxfp - myminfp) / zdots; 84: floatparm = &jbcfp; 85: x_per_inchfp = (xxmin - xxmax) / widthfp; 86: y_per_inchfp = (yymax - yymin) / heightfp; 87: inch_per_xdotfp = widthfp / xdots; 88: inch_per_ydotfp = heightfp / ydots; Why does line 85 compute min-max, but line 86 computes max-min? This is in routine JulibrotSetup. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

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lorenz.c: uninitialized variable used for sound output
by Richard 04 May '07

04 May '07

In the HEAD/trunk function plotorbits2dfloat, line 2009 declares x, y, and z as doubles. Lines 2029-2034 use the sound flags to determine which variable should be used for sound output and initialize the pointer soundvar to one of x, y, or z. None of x, y, or z has been initialized yet. On line 2071, x, y, or z is used through soundvar to output a tone based on the orbit computation and the flags. However, this will always output junk sounds because x, y, and z are never set to anything and are only used as addresses for soundvar. I'm not sure what this should be here, but it looks like bogus code and I'm removing the sound output on the branch. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>

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