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Duke07 v0.20

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@Darkcrafter07 Darkcrafter07 released this 11 Apr 15:02
· 15 commits to master since this release
v0.20
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Learn about vigilant mode.

Here comes my first Duke07 release for GitHub, v0.20 and the changelog is pretty long since the original game was modified:

===========================================================================
v0.20 features (April 11, 2026):

  • first, initial GitHub upload, forked from "videogamepreservation" archive
    https://github.com/videogamepreservation/dukenukem3d;

  • more stable and a bit faster integer slopes due to increased reciptables
    size and newton-raphons krecip iterations instead of idiv to prevent
    division by zero errors;
    ===========================================================================
    v0.19 features (March 17, 2026, 01:30AM):

  • integer slopes optimization via adaptive step size (32px for closeup,
    16px for medium distances, 8px for distant slopes);
    ===========================================================================
    v0.18 features (March 17, 2026, 01:30AM):

  • much better integer slopes for all the versions included;
    ===========================================================================
    v0.17 features:

  • "distance-slow" optimization. Turn on by /distslow command-line parameter
    allows to speed-up rendering on big open areas by rendering distant
    areas 8 times less often. Causes rendering artifacts since simple
    "drawalls" modification in engine. Both regular and 386 version are
    bundled with it.
    ===========================================================================
    v0.16 features:

  • further enhancements of low detail mode, especially "drawsprite" function
    doesn't introduce unwanted bending to the farthest bounds of a sprite,
    e.g. no more crooked-mirror effect. Depth sorting issues and infinitely
    tall repeating on sprites are now fixed, thus "trasmach4" pixel
    duplicating asm function is now on. Transparent wall sprites aren't yet
    rendered.

  • mact386.bin diagonal mouse movement slowdown fixed. File mact386.lib
    was patched with "Build Engine Mouse Fix v1.1" exe tool. No more need
    to patch it when exe's are built because the mact386.lib itself changed.
    The tool is made by "CTPAX" (fear, RUS.):
    CTPAX@MAIL.RU, ctpax-cheater.losthost.org
    ===========================================================================
    v0.15 features:

  • the original game comes with its own y-parallax scrolling defined as
    "parallaxyscale" in engine.c in "parascan" function and premap.c
    "setupbackdrop" function. Setting it to 65535 does the trick, thus
    I set my approach parallax scroll speed to 0 to disable it. So we have
    nice original smooth parallax effect and height tracking parallax
    per player. Also, my approach wasn't properly reset per level so that
    I added "g_skyycuroffs" variable, initialized it to 0 and assigned
    all sky cases offsets in premap.c. Each time a level is loaded, the
    offset resets to those defined in premap.c per "g_skyycuroffs" value.

  • an attempt to implement LQ3X mode was made. It looks even worse and
    there's no speed gain unlike LQ2X mode, thus not compiled. Set "pxlzefctr"
    variable to "3" in eng386.c, run "MakeLQ3.bat".
    ===========================================================================
    v0.14 features:

  • further enhancements on LQ2X mode, a lot has been done but there's
    a room for improvements. Now that it works just as fast as ingame low
    detail mode it looks crisper and much faster when window size is shrunk.
    Unfortunately, the old default ingame mode is ineffective on little
    windows size because it always renders a larger 160x100 view and then
    stretches up or down the rendered view onto 320x200 screen and does
    double job which makes the game perform slower.

  • correct "bswap" 386 asm instructions by Tronix, so mirrors are ok

  • the way to fill unprocessed fields in asm has been found and unlike
    left (-1, -2 etc.) or right (+1, +2 etc.) writes, there's a need to know
    screen width in pixels. It could be done by loading "_xdim" variable in
    asm functions but it's out of scope for the moment and "320" constant is
    hardcoded. Read ALQ2X.ASM for details. Enabling transmach4 pixel doubling
    logic brings the light on "drawsprite_LQ2X" function issues in eng386.c.
    There's a need to polish it further.

  • flat vertical sprites with transparency don't render yet.
    ===========================================================================
    v0.13 features:

  • an attempt to compile the game entirely for 386 with all code
    and assembly refactored to do so (mostly bswap instruction replaced and
    a different compilation path). Also, all occurences of "Nice try" in
    eng386.c were commented out (disabled).

  • an attempt to implement low detail like it's done in Doom. Duke3D does it
    by rendering a 160x100 tile and then stretching it up to 320x200 by using
    the same drawing functions that high detail mode does. It's pretty
    ineffective. Now we want to do it like in doom, e.g. call to process
    stuff like walls, floors, ceilings, sprites and sky twice as less but
    interpolate the unprocessed fields. Only walls and skies are done correct
    yet (skies use wallscan function to draw).

  • it looks bad yet
    ===========================================================================
    v0.12 features:

  • finally an "interpolated" way to do slopes with /nofpu flag.
    Ken's unfinished "slopevlin2" approach now renamed to #0.
    "slopevlin" duplicated and now is #2 approach, has its own
    precision parameters, and most importantly, simulateneous pixel writes
    to the sides, allowing to "interpolate" only those columns that were
    requested in grouscan_nonfpu function in engine.c, frame parity removed
    for a while but the file is still there if you will - engaltgs.c.
    The a.asm changes:

      ; we now add this thing above
  mov [ebp-1], al ; Pixel to the left - 1
  ;the original line below:
  mov [ebp],   al ; Center Pixel
  ; we now add this thing beneath

    mov [ebp+1], al ; Pixel to the right + 1

      you can iterate more to fill in the gaps

===========================================================================
v0.11 features:

  • up to 768000 bytes MIDI playback.

  • up to 10 custom 4-tile 256px width panoramic skies (defined
    in DEFS.CON). Make sure for the names SKYCUSTOM1-SKYCUSTOM10
    to stay the same. If you use a tile #3840, make sure you have
    3 more tiles space left in your art file, e.g. #3841,3842,3843
    must be free to fit remainig 3 parts of your sky.
    ===========================================================================
    v0.1 features:

  • y-sky parallax shearing based on player's look up/down and slopes if
    mouse aims off. Player's height relative to the world is also tracked.
    Integer math only version turned on by default as floats are useless but
    the code without integer optimization is commented and included.
    Must be done really wrong and is not very smooth.

  • /nofpu command line parameter to speed up rendering on really old and
    slow 486 or even 386 CPUs without FPU. At this moment I couldn't
    implement anything better than interleaved ticker dependent scanline
    alternation. In engine.c, basically only grouscan and drawalls functions
    are modified to handle different rendering paths. I can't modify this
    thing any further at the moment unfortunately.

  • playanm function enhanced and now correctly removes played ANM files
    from the RAM (cache) via "suckcache(anim_t_internal);" command. Turns out
    original Duke didn't do that at all because "free animation" command
    referenced to the one defined in animlib.c and it was commented out
    (disabled) for a good reason - it used John Carmack's zone.c hidden
    in "mact386.lib" memory handler which isn't compatible with Duke3D's
    cache1d.c system. All sounds are now stopped after animation is played.

  • playanm_split function is present in the code, tested but unused. Can be
    used to split a large ANM file and play in one go, one after another and
    skipped by pressing Enter, Space or Escape just once. Messes up the
    palette a little-bit after the first animation was played. Unloads
    a played ANM file from RAM (cache) before playing another one in the
    sequence. Useful to play large anm files with as much lower RAM
    consumption as possible.

  • animlib modifications to untie it from "mact386.lib" stuff with the
    same namespace. "_internal" suffix added to each of the functions.

  • correct stop all sounds after a bonus screen ( finish level screen ).
    ===========================================================================

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