KEEN 4 RECREATION TIMELINE:
---------------------------

2019-02-16:

- started implementation
- started & finished CK_MAIN.C (except for variables)
- started & finished CK_DEMO.C (except for variables and fancy intro stuff)
- started CK_GAME.C, CK_PLAY.C, CK_TEXT.C, CK_STATE.C


2019-02-17:

- finished CK_GAME.C (except for variables)
- finished CK_PLAY.C (except for variables)
- finished CK_TEXT.C (except for variables)
- finished CK_STATE.C (except for variables)
- started CK_KEEN.C


2019-02-18:

- finished CK_KEEN.C (except for variables)
- started & finished CK_KEEN2.C (except for variables)
- started & finished K4_LEVEL.C (except for variables)
- started K4_ACT1.C, K4_ACT2.C


2019-02-19:

- finished K4_ACT1.C (except for variables)
- finished K4_ACT2.C (except for variables)
- started & finished K4_ACT3.C (except for variables)
- added crawl text in K4_LEVEL.C
- added states in K4_ACT1.C


2019-02-20:

- added states in K4_LEVEL.C
- added states and initialized variables in CK_KEEN.C
- added states and initialized variables in CK_KEEN2.C
- added states in K4_ACT2.C
- added states in K4_ACT3.C


2019-02-22:

- added ID Engine (taken from Catacomb 3D)
- started creating header files to put it all together
- fixed tons of typos...


2019-02-23:

- finished header files
- fixed remaining typos & compiler errors
- code compiles, but linking fails because of missing data that needs to be
  included in EXE (AUDIOHED, AUDIODICT, EGAHEAD, EGADICT, MAPHEAD)
- first builds - lots of memory(?) issues, quitting freezes DOSBox
- fixed menu colors in ID_US_2.C
- renamed "SKULL 'N' BONES" to "PADDLE WAR" (still need to fix speed issues in pong)
- fixed error in GFXINFO (wrong number of tile16's) now help texts and quitting work
- fixed memory issue by increasing number of memory block to 1200 (Cat3D used only 600)
- first level loads now, but RF_Refresh() locks up/takes forever


2019-02-27:

- modified VW_ClearVideo to match Keen4 behavior (also adding in the bug)
- modified USL_TearDownCtlPanel to use VW_ClearVideo instead of VW_Bar
- fixed error in DrawCacheBox -> animation plays correctly now
  (but RF_Refresh still locks up/takes forever)
- fixed error in ID_CA.H (Keen4 uses tile info order SPEED, ANIM, NORTHWALL, ...)
  -> RF_Refresh doesn't lock up anymore
- fixed error in GameLoop -> can now enter sub-levels from world map
- fixed error in KeenAirReact -> can now land
- fixed bug in score box (used ammo number for lives)
- status freezes the game
- fixed signed/unsigned division bug in KeenStandThink
- fixed spawn position for slugstain
- fixed error in PlatformThink (platforms got stuck at the top/right end of the path)
- added Keen4 Highscore defaults
- fixed error in StatusWindow -> status window doesn't cause an endless loop anymore
- fixed error in DrawStatus (bad positions for a few things)
- fixed bug in CheckGrabPole -> can climb on poles now
- fixed error in KeenAirReact -> grab edge with correct y position
- fixed error in KeenClimbEdge1Think -> climbing left works correctly now
- fixed bugs in SpawnFlag (darn typecasts...)
- fixed error in ScrollScreenWorld
- fixed error in KeenPoleTihink -> won't fall off when pressing left/right


2019-02-28:

- fixed lindsey floating bug (typecasts)
- fixed mimrock walking
- fixed arachnut contact
- fixed riding the foot
- fixed thundercloud not randomly turning towards player
- fixed missing VW_UpdateScreen in LindseyDialog
- fixed KeenAirReact
- fixed EggContact
- fixed controls for scuba keen


2019-03-01:

- fixed Sprite, Dopefish and Schoolfish
- seems fully playable now...


2019-03-16:

- renamed PlayDemo to RunDemo, since that's the name that is used in the Keen 4 Demo
- fixed Dopefish contact code (used to check 'ob' instead of 'hit' for a keenobj)


2019-04-10:

- fixed bug in PatchWorldMap (info layer value wasn't set to 0 for completed levels)


2019-05-04:

- replaced all sprite numbers with enum names
- fixed error in WormouthLookLeftThink -> changes state to s_wormouth now


2019-05-06:

- replaced some more numbers with enum names


2019-05-11:

- fixed error in MergeTile16M


2019-05-17:

- fixed bug in WormouthThink (used PIXGLOBAL instead of TILEGLOBAL for xdist)


2019-05-19:

- actually moved all far strings into far memory


2019-09-27:

- fixed a minor error in PageLayout (skip anything <= space character, not just space char)


2019-09-28:

- fixed a bug in control panel (had to adjust indices because options menu was added back in)


2019-11-26:

- started implementation of Keen 5 stuff (K5_*.C)


2019-11-28:

- started implementation of Keen 6 stuff (K6_*.C)


2019-11-30:

- finished implementation of Keen 5 & 6 stuff


2019-12-09:

- reorganized KEEN4 project to add support for Keen 5 & 6 without too much redunancy
- added code specific to Keen 5 and Keen 6 to the main codebase (CK_*.C)
- excluded code specific to Keen 4 from the other builds (lots of #if & #ifdef)
- Keen 4 still compiles fine, 5 & 6 still need some header files


2019-12-10:

- created header files for Keen 5 and Keen 6
- all 3 projects compile, but still some bugfixing to do and features to add:
  - refresh manager constants must be adjusted
  - copy protection for Keen 6 isn't implemented
  - sounds for animated tiles (Keen 6) aren't implemented
- fixed a few bugs, first couple of levels in Keen 6 are playable now


2019-12-11:

- adjusted refresh manager constants (now Keen 5 levels are playable, too)
- adjusted position of the "PRESS A KEY" graphic in the status window 
  (position in Keen 4 differs from 5 & 6 because of the wetsuit box)
- added RF_MaskBlockWhite and a few other things
- studied Terminator-related code in depth, trying to understand it all and
  find names for all those variables


2019-12-12:

- finally found and fixed a bug with the turret shots in Keen 5
- fixed wrong pole shooting sprites (left and right sprites were swapped)
- fixed demo-breaking bugs in Spindred and RoboRed (Keen 5)
- fixed worldmap elevator door code (Keen 5)
- fixed worldmap rope and rocket bugs (Keen 6)
- still a demo-breaking bug somewhere (Nospike / Bloogdome, Keen 6 obviously)
- fixed pole check for shikadi pole sparks


2019-12-15:

- FUCLING FINALLY found and fixed the demo-breaking bug in Keen 6
  (was in NospikeRunThink)
- fixed bug in Shikadi Master spawn (y offset used tile units instead of pixels)
- started implementation of the Terminator intro and the Star Wars text crawl


2019-12-16:

- finished implementation of the Terminator and Star Wars stuff, but now the
  compiler crashes...
- found and fixed the issue that crashed the compiler
- fixed all bugs in the Staw Wars text crawl
- fixed all bugs in the Terminator intro

2019-12-17:

- added tile animation sounds for Keen 6


2019-12-19:

- implemented Keen 4-6 version of VW_SetScreen (in _ID_VW_AE.ASM) and my
  customized version of the routine (in ID_VW_AE.ASM). swap the files if you
  want to use the original code
- added support for the NOPAN parameter
- added US_CheckArg in ID_US_1.C
- added Quiet AdLib mode
- added Gravis Gamepad support


2019-12-20:

- fixed CheckHighScore bug (each episode uses a different map number)
- fixed shockshund bugs (blast direction, stun jump)


2019-12-21:

- fixed EagleWalkThink (condition for starting to fly, Keen 4 obviously)
- fixed tile-based item stealing for TreasureEater (Keen 4)
- fixed force field toggling (Keen 6)


2019-12-22:

- fixed bug in EagleFlyReact (Keen 4)
- changed ConfigVersion in ID_US_1.C for full compatibility with version 1.4
  (saved games are still incompatible, though)


2020-01-05:

- modified PaddleWar code to match the code from Keen 4-6


2020-01-06:

- moved minimum memory requirement into the episode headers
  (Keen 4 & 5 need 310,000 bytes, Keen 6 needs 300,000 bytes)
- added missing code in SD_Default() (also marked the bug in there)


2020-01-08:

- fixed a minor issue in ID_RF.C related to the tile animation sounds in Keen 6


2020-02-21:

- fixed a bug in Bipship movement code (Keen 6)
- modified sound engine to avoid SDL_Delay entirely and read port 0x388 instead
  (which is exactly how version 1.4 and above work)


2020-03-05:

- fixed bug in Ampton walk code


2020-04-24:

- added the title screen in DemoLoop() (after high scores)
- replaced some chunk numbers with their enum names in K4_LEVEL.C (smoke sprites)


2020-05-20:

- SpawnEnemyShot now makes the object removable (KEEN5)


2021-05-05:

- fixed bug in PageLayout (negative top row index)


2021-05-05:

- fixed bug in JanitorDialog (bad picture position for KEENMADPIC)


2021-06-06 to 2021-06-23:

- renamed things in Keen 4 & 5 to what is believed to be the original naming
  scheme - Keen 6 stuff is still guesswork
- adapted code to make it compile with Borland C++ 2.0 and 3.0
- adjusted compiler settings and code to recreate the original executables as
  closely as possible (for automated comparison and verification)
- found and fixed a few bugs along the way


2021-06-24:

- tracked down and fixed any remaining differences
- compiling (with source debugging enabled) and then compressing the EXE files
  with LZEXE Version 0.91 creates EXACTLY the same files as the original v1.4
  releases shipped with
- Mission accomplished, I guess...


2021-07-01:

- first public release of this source code


2021-07-03:

- Keen 6 EGA v1.5 can now be recreated with this source code thanks to NY00123
- added some more comments to the source code, mostly explaining what the temp
  variables are used for in each actor's code
- changed the function names in the Keen 6 code from ...Think, ...Contact and
  ...React to T_..., C_... and R_... for more consistency with the Keen 4 and
  Keen 5 code, also changed some state and sprite names for more consistency

2021-07-08:
- all CGA executables of versions 1.4 and 1.5 can now be recreated with this
  source code
- added a few more comments