Category Archives: Games

Notarized test applications & Other fixes

Most of the past couple weeks have again been a bit quiet due to busy time at the daytime job, but there are a couple improvements which are worthy of creating an update in this development diary:

Notarized macOS downloads

The set of (macOS) app bundles on the downloads page have finally been notarized, after Toni enrolled again in (& paid for) the Apple developer program for one year required to do it. So, there won’t be any longer any trouble with the scary warnings on the recent macOS versions.

The downside is, that the default notarized applications require macOS 10.9, but we’ve left the old, unsigned application bundles for Mac OS X 10.6+ compatibility, for now.

There are not much functional differences between the most recent notarized applications and the previous builds, as most of the recent progress has been on improving color compatibility, and other features in applications not currently part of the set of the downloadable app bundles.

Escape Velocity map “works” now

After a couple days of debugging, the code crashing Escape Velocity when opening the map was isolated. However, curiously it would appear there might be a bug in Escape Velocity causing the issue; in map, the game keeps track of four data structures of 10 bytes each (which I assume may contain coordinates for at least the nebula and asteroid field pictures), but in the map drawing code it accidentally accesses a fifth element in the array, which will contain random data at end of the allocated memory area. I briefly tested this part on a real Mac running Mac OS 9 – and it exhibited the same behaviour, but luckily SectRect intersected the offending corrupted coordinates, before running CopyBits, which would crash on negative source rectangle size; in M.A.C.E. as a workaround the StdBits (which CopyBits uses) was reinforced to ignore negative transfer sizes, which appears to be invalid operation on the QuickDraw on real Macs.

The Escape Velocity map window now works without crashing

There were also a couple other minor fixes:

  • MakeFSSpec did not populate the FSSpec fields correctly for non-existing file, which was required behaviour when using it to create FSSpecs for creating new files with FSpCreate
  • The “search & replace” mode in _Munger trap did not work correctly; The mission list was using this to replace “<DST>” with destination name, but in the case the search string was not found, it would keep appending it in the end of string infinitely
  • StandardGetFile selector in Std File Package was missing typeList pointer, causing the “Open pilot” dialog to not display any files

Thexder

We recently also tested Thexder on M.A.C.E., which seems to be working quite well in both “classic” monochrome mode (with audio), and in the color mode. The controls are also quite responsive, although having played previously the DOS version it took a short bit of learning to play with the numpad controls, where vertical and horizontal movement keys are combined, as holding down multiple arrow keys is disabled in the Mac version, perhaps to avoid conflicting with the use of space bar as fire button.

This game is quite rare in the sense that it is the only game which we know that uses 2-bit (four-color) mode in the color version; this however works as a perfect test case for the 2-bit display mode testing and debugging. Interestingly, the monochrome version of the game seems to have some bugs (such as enemies not following player horizontally in the same way as in color version, and also some walls destructible by lasers seem to not work correctly). But as these bugs appear also on real Macs and minivmac, it seems that at least the emulation is working as intended.

Palette fix for Loony Labyrinth

As mentioned in the previous post, Loony Labyrinth was having some color corruption problems, which seemed to only affect the playfield. After a quick evening of debugging, it appeared that as the game used custom palette for intro screens, it was trying to reset color table back to default using RestoreDeviceClut selector of PaletteDispatch, which contained some code which was left previously as unimplemented to-do task. With a quick implementation to release the palette links from the GDevice, and doing a reallocation of color entries to restore original palette, the playfield now appears and displays as it should:

Loony Labyrinth playfield now displays correctly

Also, to celebrate this in combination with the physics fixes from earlier this month, here’s a video of how well the game’s own AI is able to play the game in the demo mode:

Loony Labyrinth playing one game of pinball in the auto demo mode

Although this does not fix Marathon’s color table issue, we luckily we have identified the problem with that game, and will be fixing it before next week. More about that in the next update!

Full list of changes since last post

2020-09-29 03:12:46 +0300 • Finalize (mostly) RestoreDeviceClut implementation
2020-09-29 02:13:02 +0300 • Fix PortList allocation & add PortList debug tool
2020-09-27 03:26:40 +0300 • Fix missing typeList in StandardGetFile
2020-09-27 02:56:59 +0300 • Fix "search&replace" mode in _Munger trap
2020-09-27 02:19:43 +0300 • Implement FSpSetFInfo for HighLevelFSDispatch
2020-09-27 02:17:32 +0300 • Add dummy empty NewAlias and NewAliasMinimal
2020-09-27 02:15:44 +0300 • Populate properly fnfErr result case in MakeFSSpec
2020-09-22 11:09:13 +0300 • Merge branch 'master' of
2020-09-22 11:09:08 +0300 • Minor tweak in colorQD detection in CDEF 63
2020-09-22 02:06:41 +0300 • Fix warnings causing errors on the new Xcode
2020-09-21 03:26:21 +0300 • Fix StretchBits crashing on negative srcRect width
2020-09-21 03:24:14 +0300 • Fix ADF filenames starting with % to map correctly
2020-09-21 03:23:00 +0300 • Add OrbQuest test application JSON config to cmake
2020-09-10 13:22:57 +0300 • Fix vfs file dependency command in cmake
2020-09-10 11:57:35 +0300 • Tweak Thexder JSON config
2020-09-10 11:57:03 +0300 • Pixel-doubling support for 4-bit (16-color) mode
2020-09-10 11:56:35 +0300 • Pixel-doubling support for 2-bit (4-color) mode
2020-09-10 04:13:30 +0300 • Fix cmake to allow again unsigned apps in OSX 10.6
2020-09-10 03:19:58 +0300 • Also return success code for decoding opOpColor…
2020-09-10 03:18:11 +0300 • Add Thexder test app to cmake json configs
2020-09-10 03:17:43 +0300 • Implement opOpColor in PICT playback

Many fixes: DIVU.W, Bitfields, Time Manager; Prince of Persia 2…

A lot of has happened past week, perhaps thanks to the summer finally starting to be over, and us having more time for the project again. Here’s a breakdown of most important advances made last week:

Fixed the DIVU.W overflow calculation

A long-time bug in unsigned 16-bit division instruction was finally found, and fixed by Pukka! We accidentally calculated overflow using signed 32767 limit, while it should have been unsigned 65535. This immediately fixed highly noticeable glitches in two of the test applications, Vette! and Test Drive II: The Duel (both ironically of same racing simulation genre):

Before the fix, Test Drive II had noticeable warping and glitching in the road near the bottom, and the polygons in Vette! had sometimes incorrect tangents, causing them to get messy depending on the angle of polygon edge.

This also fixed the “Divide overflow” bug occurring in SoftPC, which was weirdly happening on certain times of day, which does indicate that some calculation related to the computer clock time was failing because of the incorrectly signaled overflow. Now SoftPC works quite reliably.

Bitfield instruction fixes

One recently added test application, Prince of Persia 2, used a lot of the bitfield instructions for the SHAP resource drawing on the screen (apparently RLE/LZ decoding), which originally had a really messy artifacts:

But after fixing the instructions, the levels finally looks as they should:

Time Manager fixes

Besides the bitfield instructions, Prince of Persia 2 also uses Time Manager heavily for timing, and that surfaced a couple nasty bugs in the code, which were fixed.

There are still so oddities to investigate, for example the intro sequence does not advance past second screen yet, and the death and level completion delays do not trigger during the gameplay.

Sadly these fixes do not (yet) fix the one special case in Speedometer, where Dhrystone test does not work properly because of some issues that may be related to Time Manager (it starts the same timer twice, and stops it before test, so it never runs).

Keyboard handling threading bug

There was also a nasty bug in keyboard handling, which had rather surprisingly managed to stay hidden for a quite long time; Basically, the SDL2 key events that were handled by the keyboard code on main thread had chance to accidentally modify data structures and especially the A0 register, while 68K was running in VBL interrupt handler, causing in some rare cases the A0 register value to get corrupted; This caused a lot of crashes in Prince of Persia 2, and is most likely the cause of a very rare crash in Wolfenstein 3D. The offending part code was made thread-safe, which fixed this particular crash completely.

Sound in SoftPC

This was a very minor fix, but still worth mentioning; the reason for why there was no sound in SoftPC was caused by the fact that the application was setting the sound driver volume from the SPVolCtl low memory global, which had been set to zero on startup. By improving the PRAM simulation to populate all low memory PRAM values with sensible default values, the sound works now nicely in SoftPC!

Dark Castle “_Random” bug

As Pukka guessed last Christmas, the reason for buggy behaviour of robots, and some other minor glitches, in Dark Castle was indeed related to calling of the “_Random” trap! Of the last weekend was spent on searching the bug in other places at first, such as robot behaviour code, until we noticed something strange.

In Apple documentation, and all references known to us, the QuickDraw random number generator is defined simply as a Pascal type function with the following signature (in IM: Mathematical and Logical Utilities, 3-51):

pascal short Random (void);

Which means, that the function takes no arguments, and returns a 16-bit signed integer on stack. But, however, the way Dark Castle used was rather odd:

This screenshot of ResEdit showing disassembly of the part of Dark Castle code calling _Random shows, that it actually ignores the result value at offset 000B60 by discarding it off stack! And later looking at the code, it was actually using value in D0 instead…so, a quick look at System 7 _Random trap handler gives some insight to this:

Here actually it is visible, that on real Macs, the trap trashes a number of registers, and has the side-effect of leaving result value in the D0 register (being a toolbox trap, the trap dispatcher does not clean up any of the registers, unlike it does for some of registers after calling OS traps).

So, to fix Dark Castle, we added extra code to set up the D0 register as the game expected it, and everything started to work perfectly.

Some other progress from these changes

A couple other test applications seemed to benefit of these changes too, although they still need a bit of work to make sense: Loony Labyrinth now loads correctly after bitfield instructions were fixed (and physics in it also work correctly after the DIVU.W fix), and Marathon now actually runs and is playable with the Time Manager fixes:

Interestingly both of these games still seem to suffer from having colors completely messed up, but besides this glitch, they appear to be playable and run quite nicely.

Bonus video

And to celebrate getting SoftPC finally to work properly, I recorded this short video of M.A.C.E. running SoftPC running David Murray’s (The 8-bit Guy) Planet X-3:

You can find more information on Planet X-3 here: http://www.the8bitguy.com/product/planet-x3-for-ms-dos-computers/

Full list of changes since last post

2020-09-09 23:29:07 +0300 • Merge branch 'master' of
2020-09-09 23:28:59 +0300 • Update CMake scripts to support Apple notarization
2020-09-09 21:14:01 +0300 • add missing addressing fixes
2020-09-09 20:32:11 +0300 • memory addressing fixes
2020-09-09 20:26:50 +0300 • Fix compilation error in QDColorStretchBits.c
2020-09-09 20:00:29 +0300 • Fix some warnings in StretchBits color blitters
2020-09-09 19:59:57 +0300 • Fix some warnings in CodeResourceWDEF1
2020-09-09 19:26:58 +0300 • Fix return value in C_PlotCIconHandle
2020-09-09 19:18:10 +0300 • Merge branch 'master' of
2020-09-09 19:16:59 +0300 • fixes for bitfield and divuw instructions
2020-09-07 04:23:28 +0300 • Tweak more Dark Castle CMake JSON configs
2020-09-07 00:04:11 +0300 • Simulate PRAM (SysParam) to make SoftPC sound work
2020-09-06 23:04:58 +0300 • Update MACE version in CMake config
2020-09-06 13:14:44 +0300 • Color pixeldouble & (disabled) CRT simulation
2020-09-06 03:45:52 +0300 • Update trap generator XLS file
2020-09-06 03:44:13 +0300 • Tweak Dark Castle JSON config settings
2020-09-06 01:52:48 +0300 • Hack Random result value in D0 to fix Dark Castle
2020-09-05 03:54:17 +0300 • Get correct tmCount in RmvTime for non-first tasks
2020-09-03 02:16:54 +0300 • Fix the conversion of positive count in PrimeTime
2020-09-02 19:30:04 +0300 • Fix threading issue with keyboard input module
2020-09-02 19:28:30 +0300 • Don't crash on purged handles in GetHandleSize
2020-09-02 19:27:42 +0300 • Fix a lot of Time Manager bugs & clean up the code
2020-09-02 19:23:45 +0300 • Fix typing of region handle to CMDoDrawControls
2020-08-31 23:01:40 +0300 • A simplified MakeFSSpec implementation, for POP2
2020-08-31 04:17:44 +0300 • Add missing EqualRect change in EmuUtils.h
2020-08-31 04:16:59 +0300 • Fix GetCCursor crash when ResLoad was FALSE
2020-08-31 04:16:08 +0300 • Add dummy SCSIDispatch for Loony Labyrinth
2020-08-30 21:32:44 +0300 • Add Prince of Persia 2 to test app JSON configs
2020-08-03 01:45:10 +0300 • Make NewGWorld's rowBytes to work w/ Color VETTE!
2020-08-01 20:08:42 +0300 • Record PICT2 opHiliteColor, opOpColor &opDefHilite
2020-08-01 19:45:53 +0300 • Record HiliteBit as opHiliteMode in PICT2 format

Side projects, fixes to full extension addressing mode & new video

The summer is soon over, so we are getting a bit more time to work again on MACE. There’s not much to report at this point, but here’s a short breakdown of the most important news

Side Projects

During August, Toni got did the first side project, which in this case was creating a hack to fix the graphics corruption issue in Vette! in color mode. More information about that is available on the new side projects page here:

mace.software/side-projects

The side projects will eventually also include other interesting tools, we will write more information about this when we have something more to show

Full extension addressing mode fixes

In this past weekend, we took a moment of time to refine and fix the 68020 full extension addressing mode support, which had some bugs in it. With these fixes, a number of games are now working better:

  • Loony Labyrinth now survives through first-time decompression & startup, but still fails after first two intro screens in some data validation
  • Escape Velocity no longer crashes in the main menu, and can actually enter the gameplay screen. There are however other issues that still need to be investigated and fixed (for example, the star-field appears distorted, and opening map crashes the game)
  • Prince of Persia 2 no longer crashes during startup, BUT because MakeFSSpec is not completely finished, it fails to resolve pathname to the data folder, causing the load to fail at the moment
  • F117A no longer crashes during intro, but plays all the FLVC animations nicely, and has (almost) completely functional menus. The in-game does not yet work, though, as the game uses ADB Manager calls to (most likely) interface joysticks and/or other input devices. It should be pretty trivial to add some placeholder trap handlers in the near future.

Other applications may also be positively affected, but those were the most notable ones we were able to briefly test during the weekend. Here are also some screenshots of the progress:

New video (Continuum)

We also took a moment to create a video of Continuum gameplay, which was long due since we got the game already working literally almost one year ago. The video also attempts to show the experimental “CRT simulation” rendering, which however is a bit butchered by the Youtube compression & video playback scaling (for best results, use either HD resolution in fullscreen, or SD with scaled-down player):

Finally, gameplay video of Continuum

This new rendering mode is not yet available in the downloadable applications, but will be added later as optional feature that can be activated by user preference.

Post-midsummer update; Eric’s Ultimate Solitaire

As we estimated previously, the progress has been a bit slow during the summer months, with so many things to do in “real life”. But there have been a few things here and there that have been tweaked in the moments, when there has been a moment of time. Here’s a brief breakdown of the key things that have been changed:

In attempt to get some picky color games to work (such as Warlords 2, Warcraft and A/10 attack), a number of hacks have been added:

  • A number of placeholder gestalt functions, with dummy values to allow the games to pass startup tests (for example, Warlords 2 appears to not start unless the system tells it supports truetype fonts…)
  • Some help manager’s Pack14 selectors, such as querying balloon help mode and setting the balloon help mode
  • A number of process manager selectors in OSDispatch, which seem to be used by some apps to check if it is in foreground in multitasking environment
  • More dummy placeholders for Apple Events. There was not yet time to research futher, but I’m guessing some of the apps are expecting kAEOpenApplication (‘oapp’) event at startup to proceed correctly. The apple events will most likely be implemented parallel to better process manager support later, so that any dependencies with EPPC can be verified)
  • subPin mode for the awesome looking alpha-blended shadows in Warlord’s 2 windows

More work is still needed to make the above games work, assumedly the lack of AppleEvents right now is blocking a number of them from working.

Eric’s Ultimate Solitaire Sampler also required implementing (& fixing) some things:

  • Some color blitter updates (blend and srcBic transfer mode improvements, and other minor improvements). The game uses these to do nice blending effects on the highlighted cards, including blending the card “slots” with background. These appear now to draw exactly like on real Mac.
  • ‘PICT’ opOrigin opcode was fixed, if a picture would have a non-zero origin, the fact that V and H values were swapped would cause it to be drawn at a wrong location

One of the most important changes was finally fixing the SANE’s Extended 80-bit to 64-bit double encoding/decoding bugs. The basic exponent/fraction conversion was already fixed over one year ago, but the special cases were completely broken (such as NaN, Inf and zero values). Also, clamping the exponent/fraction values when doing conversion to lower bit size was broken, instead of actually getting clamped these values would wrap around…not good! Most notable result of these fixes is that Speedometer now displays properly zero (0) as the initial score instead of 2.0.

Below are some screenshots of this awesome-looking card game:

There are still a couple issues left to fix, most notably the game complains about missing resources on each startup, even though it still succeeds to open. And as the sound manager implementation for the color version environment is still unfinished, there are no sounds yet. But mostly, the game works quite well, and is very playable, as you can see from the number of games and time played statistics screenshot above 🙂

At the moment, Toni is working on getting the picture recording to work in color mode (PICT2 support), which is required to get some editors to work properly in ResEdit, and Pukka is researching the full extension word format of 68020 emulation, which when will allow a large number of new color applications to work.

Full list of changes since last post

2020-07-31 22:06:34 +0300 • More work on PICT2 recording (pixpats in-progress)
2020-07-21 05:29:26 +0300 • Support grafProcs' putPicProc for StdPutPic
2020-07-21 05:01:31 +0300 • Implement CopyPixPat trap
2020-07-16 22:41:09 +0300 • Initialize pnMode correctly in OpenPicture
2020-07-16 22:40:40 +0300 • Fix PICT verb recorder bugs (pnSize & swap pnMode)
2020-07-16 05:13:03 +0300 • Make StdComment recording version 2 compatible
2020-07-14 05:47:44 +0300 • OpenCPicture & ColorQD OpenPicture abstraction
2020-07-08 05:31:55 +0300 • Tweak Float64 to Float80 conversion (denorm exp)
2020-07-07 14:34:46 +0300 • Other Float80 special cases; NaN, denormals, infs
2020-07-04 20:35:08 +0300 • Handle zero special case @ 80-bit float conversion
2020-07-04 12:28:21 +0300 • Fix mixed up H and V delta values in opOrigin
2020-07-04 12:26:43 +0300 • Add non-colorizing stretch blitter for srcBic mode
2020-07-04 04:05:17 +0300 • Fix opOrigin picture opcode
2020-07-04 02:35:44 +0300 • Fix missing alignment shift of arithmetic blitters
2020-07-03 14:39:58 +0300 • Implement FSUBS for SANE's FP68K dispatcher
2020-07-03 14:34:15 +0300 • Improve direct color support in stretch blitter
2020-06-28 01:38:25 +0300 • Add indexed region blitter for "blend" (0x20) mode
2020-06-28 01:36:23 +0300 • Add Eric's Ultimate Solitaire Sample test app
2020-06-22 02:45:59 +0300 • Fix inverted handling of TE record's active flag
2020-06-22 02:44:50 +0300 • Add AE and ProcMgr control configs to environment
2020-06-14 04:58:58 +0300 • Add Prince of Destruction test app to cmake JSON
2020-06-13 21:42:12 +0300 • Add missing procNotFound define to MacErrors.h
2020-06-13 21:41:27 +0300 • Add A10 Attack! Demo test app to cmake json config
2020-06-13 19:13:46 +0300 • Add dummy GetNextProcess
2020-06-13 19:13:10 +0300 • Add some missing data types & enums to Processes.h
2020-06-12 04:08:43 +0300 • Add dummy InitEditionPack & EditionManager module
2020-06-12 03:56:06 +0300 • Add dummy RestoreDeviceClut selector
2020-06-12 03:44:33 +0300 • Properly fix the previously disabled optimization
2020-06-12 00:10:50 +0300 • Add dummy AESetInteractionAllowed Pack8 selector
2020-06-11 17:48:36 +0300 • Fix InvalMenuBar to really work (Warlords 2 menus)
2020-06-10 20:57:41 +0300 • Disable a buggy copybits colorization optimization
2020-06-10 19:09:03 +0300 • subPin mode color region blitter (WarLords 2 demo)
2020-06-10 19:08:15 +0300 • Fix invCT pointer in color mapping (skip header)
2020-06-10 13:59:56 +0300 • Fix WDCB allocation: list size is bytes, not count
2020-06-10 05:57:31 +0300 • Dummy HMIsBalloon & HMSetBalloons for Pack14
2020-06-10 05:51:30 +0300 • GetCurrentProcess, GetProcessFromLayer, SameProc..
2020-06-10 05:29:24 +0300 • Implement AECreateDesc in Pack8 (AppleEvents)
2020-06-10 05:28:23 +0300 • Add MacAppleEvents.h (+move old stuff from Events)
2020-06-10 05:27:17 +0300 • Tweak trap generator to allow "result" param name
2020-06-10 04:49:08 +0300 • Add dummy OSDispatch & GetProcessInformation
2020-06-10 04:17:52 +0300 • Fake gestaltLaunchControl flag for Warlords 2
2020-06-10 03:52:44 +0300 • Fix script mgr gestalt functions (emIntlGlobals)
2020-06-10 02:35:00 +0300 • Add 'a/ux', 'edtn', 'help', 'pop!', 'font', 'stdf'
2020-06-10 01:23:22 +0300 • Add dummy AEInteractWithUser selector for Pack8
2020-06-10 01:14:16 +0300 • Add 'kbd', 'hdwr', 'evnt' and 'os ' gestalt funcs

A quiet month of May

This is just a quick & short status update to let everybody know we’re still alive. This past month has just been really busy in the real work, life and with other things, so not much progress has been done in this period.

However, to give some essence for this update, on this weekend we went through a bunch of potential candidate applications to test emulation with, and although many of them still show the need for work to be done, we did get at least one game to partially work in this short time, Flight Commander 2, so here’s a bunch of screenshots of it for your enjoyment:

The game itself is only playable until first enemy move, after which seems that some bug, possibly in SANE emulation, is causing the game to get stuck in an infinite loop. Will look into that in the nearby future.

Besides slow month of May, the early summer will also be a little slow, but we’re still very focused on working on the project. But certainly this small break will give us the energy and motivation to continue with full speed later in the summer. And we will also do some other cool 68k Mac stuff if we have time – we will be giving more details when we get more progress in things.

Full list of changes since last post

2020-06-01 00:41:01 +0300 • Add FLOG2X to Elems68K
2020-06-01 00:16:42 +0300 • Fix wideopen region expansion (crashed in DiffRgn)
2020-05-31 23:50:07 +0300 • Add StandardGetFile selector(6) to Pack3(StdFile)
2020-05-31 23:47:14 +0300 • Add Flight Commander 2 Demo test app to cmake json
2020-05-31 23:46:53 +0300 • Add Warlords 2 Demo test app to cmake json configs
2020-05-31 22:33:07 +0300 • Ignore dotfiles in mac icon converter
2020-05-31 13:23:28 +0300 • Add in-progress CDEF 1 color support (unfinished!)
2020-05-31 13:23:03 +0300 • Disable some truetype font assertions in font mgr
2020-05-31 13:22:32 +0300 • Add (unfinished) str2dec conversion, to fix later
2020-05-31 13:21:28 +0300 • Add Lode Runner(TLR) test app to cmake JSON config
2020-05-31 13:21:02 +0300 • Add Warcraft II Demo test app to cmake JSON config
2020-05-31 02:34:57 +0300 • And also fix selector def of HMGetBalloons, 0 args
2020-05-31 02:33:37 +0300 • Fix GetGray selector definition in PaletteDispatch
2020-05-31 02:32:04 +0300 • Add dummy HMGetBalloons to Help Manager (Pack14)
2020-05-31 02:31:05 +0300 • Check the default mode in SetDepth for result code
2020-05-31 02:30:08 +0300 • Add Warcraft Demo to test app cmake JSON configs
2020-05-31 02:29:52 +0300 • Add PowerPong to to test app JSON configs

GWorlds and PixPats

Since the last update, there has been progress on many features, but especially on the following ones to highlight:

GWorlds

The GWorld routines are practical utility functions for easy creation and handling of off-screen color ports, relieving the developer from a lot of mundane tasks for allocating the memory structures and house-keeping them. In the old “classic” QuickDraw, the developers were forced to do all this by themselves, but on other hand, the old-style QuickDraw had a lot less complexity and fewer data structures. The color QD requires maintenance of PixMap structures, and possibly “fake” GDevice handles with unique color tables and inverse color lookup tables, etc. The routines which color version were implemented this time were (* indicates ones that previously existed for “classic” QD’s GWorld wrappers):

  • NewGWorld
  • LockPixels*
  • UnlockPixels*
  • DisposeGWorld
  • GetGWorld
  • SetGWorld
  • CTabChanged
  • AllowPurgePixels
  • NoPurgePixels
  • GetPixelsState
  • SetPixelsState
  • GetPixBaseAddr
  • GetGWorldPixMap

The games which benefitted most of the new GWorld routines were Wolfenstein 3D, SimCity 2000 and Civilization. It is also possible other games are utilizing them, but these were the ones first encountered in the test suite:

Wolfenstein 3D

PixPat support

Another new feature added in the color QuickDraw are the PixPat patterns. As old QuickDraw only allowed 1-bit monochrome patterns, these PixPats have much more flexibility allowing multi-color patterns and also higher resolutions (most commonly seen as powers-of-two from 8 to 64 pixels, and up to 256 colors, although the PixPat data supports also “direct” pixel data).

The interesting feature of these “pixel patterns” is the fact that they actually use regular PixMap data as the pattern storage, so that a lot of internal routines for PixMap manipulation were directly helpful in the implementation of the color patterns. The most code needed for pixpat-specific drawing were the conversion to target depth (using the shader PixMap translators), and handling the special pattern modes in blitters, with repetition of pattern with variable-size dimensions.

Glider 4.0 in color

The first games requiring use of PixPats were Glider 4.0 and Siege of Darkwood – but as a nice side effect, we now also have support for using color patterns on the desktop!

Other stuff

There were also many other minor improvements, some of which include:

  • Finally a proper region-clipped color blitter (was on TODO list for a long time…)
  • 32-bit PICT pixel data support, needed for Escape Velocity
  • CopyBits & ScrollRect, for Civilization and SimCity 2000 map scrolling
  • A bunch of new blitter modes
  • Partial resouce read support for SimCity 2000
  • Abstracted resource loading as a magic “CheckLoad” vector, to make AutoDoubler-compressed applications work (the one we encountered was the color version of Lemmings)
  • MANY bug fixes and other improvements (complete list of everything at the end of this post)

New videos

Since the the last post, we have two new videos of test applications running in color mode. First is Glider 4.0, which seems to now be playable, benefitting especially from the most recent transparent arithmetic transfer mode support:

Glider 4.0 running in color mode on M.A.C.E.

Also, here’s video of Wolfenstein 3D running (the lag is from QT video capture, game itself runs quite smoothly):

Wolfenstein 3D running on M.A.C.E.

And of course as Sound Manager is not yet implemented, there is no audio in either videos.

Status of some of the color test applications

There are also some other games which are starting to get more functional in color mode, here’s a brief update on where they’re at right now:

Most of these games run nicely, but there are some common issues still to be resolved:

  • Menu drawing still need to be updated to support color mode properly
  • List Manager does not yet handle hilite mode properly
  • Scroll Bars are still rendered as monochrome versions only
  • Standard File dialogs have still issues with color mode (folder popup menu, hilite mode, etc)
  • No sound yet because of incomplete Sound Manager implementation
  • Horizontal stretching for pixmap data is not yet implemented (although vertical stretching is), so horizontally scaled text/images do not yet appear properly
  • A lot of missing blitter modes (they will be written as needed in the first pass, but will be generalized and optimized later so that all cases will be properly covered)

There are also a couple cases with application-specific problems:

  • Maelstrom is playable & smooth, but gets stuck at end of level screen probably because of missing Sound Manager Implementation
  • Civilization has a rare bug where inverse color tables appear to break down after playing the game for some time
  • SimCity 2000 has a palette manager bug where a couple of palette entries go to wrong slots, causing a couple specific colors to not display properly (mostly visible in the title screen, and “Dispatch Firefighters” map sprite)
  • Escape Velocity gets to main menu, but crashes due to some unresolved 68k cpu emulation bugs which Pukka is investigating

The status page will be updated in the coming weeks to reflect this new status.

Full list of changes since last post

2020-04-07 00:38:42 +0300 • Add pixpat patOr mode for color rectangle blitter
2020-04-07 00:31:42 +0300 • Add srcBic support to color rectangle blitter
2020-04-07 00:30:52 +0300 • Fix outline/shadow text style in color text render
2020-04-06 21:29:15 +0300 • Do 68K VM stack guard magic check for native fra..
2020-04-06 01:07:31 +0300 • Set bg color in SetWinColor, fix Siege of Darkwood
2020-04-06 00:39:03 +0300 • Fix crash when decoding pixpats from PICT resource
2020-04-05 23:10:26 +0300 • Fix GetPalette bitmasking (missing window redraws)
2020-04-05 05:21:26 +0300 • Indexed transparent arithmetic region renderer
2020-04-05 04:39:00 +0300 • Indexed transparent arithmetic rectangle renderer
2020-04-05 03:22:26 +0300 • Indexed transparent arithmetic scanline renderer
2020-04-04 16:53:34 +0300 • Clean up old commented-out legacy code
2020-04-04 16:52:27 +0300 • Handle undefined EnvDefaultColorDepth case
2020-04-04 16:51:21 +0300 • Handle arithmetic mode setup for color mapping
2020-04-01 22:24:46 +0300 • Update test desktop background pattern
2020-04-01 03:01:26 +0300 • Color desktop ppat (forced on for now for testing)
2020-04-01 02:47:14 +0300 • Fix 8x8 pixpat expansion
2020-04-01 01:59:00 +0300 • Implement (mostly) pixpat conversion & rendering
2020-04-01 01:57:35 +0300 • Separate pixel translation from stretch blitter
2020-04-01 01:43:46 +0300 • Clear CGrafPort refs to pixpat in DisposePixPat
2020-03-30 16:59:25 +0300 • Add (partial) FillCRect/Oval/Arc/Rgn/Poly
2020-03-30 16:00:04 +0300 • Add EnvDefaultColorDepth for app-specific default
2020-03-30 15:32:31 +0300 • Fix region masking bug of diagonal Line/LineTo
2020-03-30 15:30:07 +0300 • Fix ErasePoly (typo from copy-paste)
2020-03-30 11:53:03 +0300 • Fix right-to-left color rectblit & right-edge mask
2020-03-30 04:57:07 +0300 • Add srcXor mode for non-colorizing stretch blitter
2020-03-30 04:54:25 +0300 • Color QD version of polygon operations
2020-03-30 04:47:10 +0300 • Add region-clipped color blitter & fix LOT of bugs
2020-03-30 04:44:10 +0300 • Fix invalid masking in srcCopy in translating blit
2020-03-30 01:18:15 +0300 • Fix iteration of region 3-only non-rect case
2020-03-28 21:53:06 +0200 • Fix inverted hilite flag check in colorized WDEF 0
2020-03-27 21:39:58 +0200 • Fix TextEdit locals saved forecolor overlap bug
2020-03-27 20:45:13 +0200 • Add color support also to WDEF 0 zoom box drawing
2020-03-27 19:34:27 +0200 • Add color support to WDEF 0 growbox drawing
2020-03-27 16:36:51 +0200 • Add (partial) color QD support for ScrollRect
2020-03-27 15:18:16 +0200 • Add Loony Labyrinth test app to CMake JSON configs
2020-03-27 15:17:43 +0200 • Implement SaveFore/Back & RestoreFore/Back
2020-03-27 02:46:11 +0200 • Fix (again) AnimatePalette
2020-03-27 01:36:19 +0200 • Set default palette in GetNewWindow/GetNewCWindow
2020-03-26 23:12:07 +0200 • Implement ReadPartialResource in ResourceDispatch
2020-03-26 22:26:03 +0200 • Fix HCreateResFile (dirID mishandled)
2020-03-26 21:02:04 +0200 • Improve StdText CGrafPort/GWorld compatibility
2020-03-26 21:00:46 +0200 • Fix CloseResFile stack frame mismatch
2020-03-26 20:11:11 +0200 • Implement SetPixelsState and AllowPurgePixels
2020-03-26 19:54:40 +0200 • Implement GetPixelsState selector in QDExtensions
2020-03-26 19:46:06 +0200 • Implement SetGWorld selector in QDExtensions
2020-03-26 19:33:15 +0200 • Implement GetGWorldPixMap selector in QDExtensions
2020-03-26 19:16:17 +0200 • Implement GetGWorld in QDExtensions
2020-03-26 19:12:42 +0200 • Implement Palette2CTab
2020-03-26 18:45:36 +0200 • Add SimCity 2000 test app to CMake JSON configs
2020-03-26 17:24:03 +0200 • CopyBits improvements (fix Escape Velocity crash)
2020-03-26 02:59:02 +0200 • Add 32-bit to indexed color conversion to blitter
2020-03-26 02:57:00 +0200 • Fix rgb PICT data unpack for rowBytes > 250
2020-03-26 02:56:00 +0200 • Implement DisposeCIcon
2020-03-25 22:09:57 +0200 • Support 'PICT' packType=4 RGB data (run-packed)
2020-03-25 20:45:05 +0200 • Start collision check from current link, not next
2020-03-25 19:08:43 +0200 • Fix color blitter for <=32bit wide transfers
2020-03-25 18:35:49 +0200 • Conditionalize Paletter Manager debug log output
2020-03-25 18:34:59 +0200 • Handle collisions in inverse color table lookup
2020-03-25 14:08:12 +0200 • Validate input in SetEntries & clear cached fonts
2020-03-25 03:01:34 +0200 • Fix UInt16/SInt16 RGB delta bug in palette update
2020-03-25 01:13:22 +0200 • Add missing A6 setup for the CheckLoad wrapper
2020-03-25 01:05:40 +0200 • Add secret "CheckLoad" hook (AutoDoubler support)
2020-03-25 00:57:35 +0200 • Add color Lemmings JSON to CMake test apps configs
2020-03-24 22:34:47 +0200 • Clamp cursor hotspot between [0, 15]
2020-03-24 22:34:15 +0200 • Fix color CopyBits thePort/dstBits comparison bug
2020-03-24 19:55:58 +0200 • Extract color QD rect blitter to own module
2020-03-24 19:30:09 +0200 • Implement DisposeGDevice (used in DisposeGWorld)
2020-03-24 14:47:56 +0200 • Implement color QD version of ClosePort
2020-03-24 04:24:57 +0200 • Unreserve palette entry when cleared (single GD)
2020-03-24 04:23:41 +0200 • Set MemErr to noErr in ReservMem on success
2020-03-24 02:35:37 +0200 • Fix negative dstLeft corruption @ B/W stretch blit
2020-03-23 21:01:59 +0200 • Implement DeleteMCEntries
2020-03-23 20:50:33 +0200 • Paint window (and invalidate) on ActivatePalette
2020-03-23 20:49:14 +0200 • Draw desktop pattern for PaintOne(nil) case
2020-03-23 20:44:03 +0200 • Fix AnimatePalette for srcIndex > 0 cases
2020-03-23 01:41:36 +0200 • Fix GetCatInfo bug by previous fix (non-WDCB case)
2020-03-23 01:27:40 +0200 • Minor menu color entry manipulation tweaks
2020-03-23 01:25:58 +0200 • Fix monochrome QD compilation error
2020-03-22 23:36:53 +0200 • Implement SetEntryColor
2020-03-22 23:24:53 +0200 • Implement GetPalette trap for Palette Manager
2020-03-22 22:09:37 +0200 • Extract PaletteDispatch routines to own C module
2020-03-22 21:42:58 +0200 • Add Ultimate Doom test app to JSON configs
2020-03-22 21:42:24 +0200 • Add CTabChanged and (partial) DisposeGWorld
2020-03-22 07:33:06 +0200 • Give more CPU time for 68020+ mode
2020-03-22 06:46:10 +0200 • Fix buffer size bug in NewGWorld w/ pixelDepth = 0
2020-03-22 03:55:04 +0200 • Implement FCMPS in FP68K (SANE) for Wolf3D
2020-03-22 03:42:46 +0200 • Improve bits opcode (9x) for non-indexed support
2020-03-22 03:37:10 +0200 • Implement NoPurgePixels selector
2020-03-22 03:36:45 +0200 • Fix unassigned pmBounds.left bug in NewGWorld
2020-03-22 02:23:21 +0200 • Implement color QD version of NewGWorld
2020-03-22 02:22:18 +0200 • Resolve WDCB to DirID in GetCatInfo ioFDirIndex>1
2020-03-21 18:50:18 +0200 • Add 'qdrw' Gestalt selector (Quickdraw features)
2020-03-21 04:44:26 +0200 • Fix pixpat opcodes in DrawPicture
2020-03-21 04:42:32 +0200 • Implement unpacked pixmap data load in DrawPicture
2020-03-21 04:40:28 +0200 • Fix CloseWD crash (ignore ioNamePtr)
2020-03-21 03:43:35 +0200 • Implement CopyPixMap
2020-03-21 02:26:20 +0200 • Fix GetPenState bug (caused gray fills everywhere)
2020-03-21 01:33:43 +0200 • Implement color QD version of ScrnBitMap
2020-03-21 01:20:54 +0200 • Hack tmp SoundBase to make Glider 4 happy in color
2020-03-21 01:19:08 +0200 • Implement color CopyMask (untested!)
2020-03-21 01:17:37 +0200 • Fix missing argument deref in color pat conversion
2020-03-21 01:16:34 +0200 • Add 'vm ' Gestalt selector (returns 0 for no VM)
2020-03-21 01:14:12 +0200 • Add HWPriv & dummy FlushData/FlushInstructionCache
2020-03-20 19:18:33 +0200 • Fix colorQD highlight bug of radio/checkbox button
2020-03-20 19:09:02 +0200 • Implement grayishTextOr mode for StdText
2020-03-20 19:07:55 +0200 • Implement GetGray selector for PaletteDispatch
2020-03-20 19:06:06 +0200 • Tweak signature of rgb delta calculation to UInt16
2020-03-20 18:20:45 +0200 • Implement patBic mode in pattern rect blitter
2020-03-20 06:22:31 +0200 • Fix StdGetPic, handle byteCount as unsigned UInt16
2020-03-20 06:20:48 +0200 • Implement GetPixBaseAddr selector in QDExtensions
2020-03-20 05:27:15 +0200 • Fix masking bug in color stretch blitter
2020-03-20 03:38:11 +0200 • Add a bunch empty dummy SoundDispatch placeholders
2020-03-20 02:57:14 +0200 • Implement QDError trap
2020-03-20 02:54:26 +0200 • Implement FSpOpenResFile and FSpCreateResFile
2020-03-20 02:52:57 +0200 • Implement HCreateResFile
2020-03-20 02:29:20 +0200 • Add semi-dummy ResolveAliasFile selector
2020-03-20 02:08:52 +0200 • Add Escape Velocity test app to cmake configs
2020-03-20 02:08:30 +0200 • Add missing file from previous commit
2020-03-20 02:08:18 +0200 • Add Pack12 & Fix2SmallFract+SmallFract2Fix+RGB2HSL
2020-03-20 00:06:06 +0200 • Fix signature of SwapMMUMode
2020-03-19 23:25:45 +0200 • Fix text styling buffer overflow in color QD
2020-03-19 23:22:36 +0200 • Apply kernMax in color font renderer
2020-03-19 19:18:59 +0200 • Update & re-seed GDevice pmTable in SetEntries too
2020-03-19 16:01:13 +0200 • 4-bit debug palette view
2020-03-19 16:00:59 +0200 • Implement SetPortPix trap
2020-03-19 01:26:06 +0200 • Add fake SwapMMUMode trap
2020-03-19 01:24:19 +0200 • Add dummy 'snd ' Gestalt selector
2020-03-19 01:23:39 +0200 • Dummy SoundDispatch (& dummy SndPlayDoubleBuffer)
2020-03-19 00:40:09 +0200 • Add Maelstrom test app to cmake configs
2020-03-19 00:39:47 +0200 • Dispose auxCtlRec also in DisposeControl trap
2020-03-19 00:29:57 +0200 • Fix 'cctb' ID=0 bug
2020-03-19 00:15:34 +0200 • Implement ProtectEntry and ReserveEntry traps
2020-03-18 23:53:47 +0200 • Fix RS stack frame mismatch in FrameRect
2020-03-18 23:53:10 +0200 • Implement TestDeviceAttribute & SetDeviceAttribute
2020-03-18 23:44:13 +0200 • Implement GetCWMgrPort trap

More color support & Palette Manager

The ongoing epidemic in the world these days is sadly the focus of the news and is touching in some way all of us, and we hope the people reading this will stay safe and healthy during these challenging times. Although our close ones have not (yet) been affected directly by the situation, the impact on our daily lives is already taking effect, as some of us are currently working remotely from home, borders are being closed, and toilet paper is being stockpiled.

One way for us to deal in these times when our lives are getting limited, is to focus our energy on the things we love, one of which for us is working on this project. And hopefully our ongoing efforts will encourage others to look forward into the future with positive thoughts.

Since last post, the focus has been on improving color support on multiple fronts, and testing the new functionality on color-capable test applications. Last month, we already got gameplay to work in KYE, and now two more games are starting to give good results; Railroad Tycoon and Prince of Persia.

Font rendering & window widgets

One important part missing from KYE (and all apps in general) was the font rendering. This was visible as the absence of menu items and window titles, which works now for the basic cases:

Font rendering works now in color mode (and window widgets)

Also the window widgets finally work, which can be seen in the above screenshot as the goAway box is visible in topleft corner of the Window. The WDEF 0 supports all ‘wctb’ parts now as the original System 7 WDEF did, and colorizes them using a method which should visually give nearly equal results.

At the time of writing this, text rendering in color mode only works for non-styled, and non-scaled text. The styling requires use of an extra offscreen buffer, which we haven’t yet had time to implement for the color version, and scaling requires stretching color blitter, which is not yet implemented.

Menu, Dialog and Alert color tables

As the basic text rendering works now, one interesting game to try it out with is Railroad Tycoon, because that game utilizes heavily custom color tables for menus, windows, dialogs and alerts:

Railroad Tycoon first intro dialog box in color

The above screenshot demonstrates all of those features in one picture:

  • The blue menus are colorized using ‘mctb’ resources
  • The red dialog background comes from ‘dctb’ resource (which is equal to both ‘actb’ and ‘wctb’ resources in both structure and usage)
  • The white text in labels (and red background for them) comes from ‘ictb’ resources

Color ‘PICT’ Pictures

Another new feature is the (partial) support for color pictures, that is, PICT resources containing pixmap data in addition to 1-bit bitmap data and methods for controlling the color-specific features in CGrafPorts. With a couple opcodes improved with color support, we got this:

The picture data reading and blitting works nicely, except that the Railroad Tycoon logo has some glitches on left and right edges. It might be related to unfinished region clipping code, but I suspect we might also need to double-check the alignment handling. The main menu in Railroad Tycoon looks a bit messed up at the moment, as the pen pattern setting is probably having some minor issues (it should have solid black pattern, but defaults to 50% gray-dither pattern at the moment).

And the Glider 4.0 main screen also works now with the picture rendering code:

Glider 4.0 main screen in color

Palette Manager

One thing that was a bit off in the Railroad Tycoon intro and main menus was also the color table, because the game actually uses a custom palette for a nice sepia tone. This meant that next up was the implementation of Palette Manager, as up until now only the default system color lookup table (‘clut’ resources for individual color depths) was used to colorize everything.

Tolerant colors

The first use case, as mentioned above, was Railroad Tycoon, which was a bit easier to deal with, as it uses ‘tolerant’ colors in its palette. The palettes in the game are actually 16-color palettes, replacing the entire color lookup table, but they work also nicely in the 256-color mode which we tested:

On the left, you can see that the skin and map have highly ‘carroty’ orange shade, while on the right, with correct palette, they appear in nice sepia tones as intended. We also added a small palette debug feature to show state of color lookup tables. In this case, the ‘tolerant’ colors replaced the closest matches in the system ‘clut’, making it appear nearly same.

Animated colors

Another game which uses palettes heavily, is our beloved Prince of Persia game. Unlike Railroad Tycoon, PoP uses actually ‘animated’ colors, as it depends on AnimateEntries/AnimateEntry to do color animation, AND nice fade-to-black palette effect.

The above screenshots show the progress made during ‘animated’ color implementation. There were a lot quirks and stumbles along the way, but here are key findings of Palette Manager regarding Prince of Persia:

  • It uses ‘animated’ palette entries to do color animation (fade-to-black, twinkling stars, flash effects)
  • The black & white entries of palette are manually set by the game as ‘tolerant’ to allow mapping them to correct black & white at indices 255 and 0 respectively
  • The game maps each of the 200+ colors dynamically to the ColorTable indices using PmForeColor, and polling the resulting color index
  • It appears to convert the images itself to correct indices using the mapping data it gathered
  • The CopyBits calls to blit graphics depend highly on a “same bit-depth, same color table seeds and uncolorized” optimization, where we skip creation of color translation table in the blitter. This is also one part which requires the black to be mapped correctly at index 255, as it allows detecting that using combination of white background (index 0) and black foreground (index 255) skips the need for colorizing
Prince of Persia level 1

The game almost works now, and is actually playable, but encountered a strange crash inside VBL handler during the first level (VBL queue got corrupted, the screenshot above is from the moment when the crash happened). We need to investigate that further in the near future.

Prince of Persia color intro video

To celebrate the advancements made in M.A.C.E., we made a short video of how the color version of emulator looks like when running Prince of Persia:

Prince of Persia Mac Color version intro & demo level

Note that the bottom-right corner shows the rather ‘hacky’ palette debugger, which nicely demonstrates how the game is using AnimateEntries to do color fades & effects.

Next steps

There are a lot of things still to do, but the progress seems promising. For example, we need to get menus to actually work (the saving & restoring menu background is not yet adapted to support color mode), text rendering needs the support for styling, QDExtensions needs desperately GWorld routines, region blitter needs to be finished, etc. This is a short breakdown which is blocking what test apps:

  • Glider 4.0: Needs CopyMask, etc.
  • Indy 3: Needs TestDeviceAttribute, etc.
  • Siege of Darkwood: Needs FillCRgn, etc.
  • Crystal Quest: Needs blitter improvements, etc.
  • Railroad Tycoon: Needs font styling, CopyMask, etc.
  • Civilization: Needs GWorld routines
  • Wolfenstein 3D: Needs GWorld routines

When we get those tasks to advance, we should be able to run more color games in the near future. Stay tuned!

Full list of changes since last post

2020-03-18 03:28:52 +0200 • Implement colorizing srcBic pixel blitter
2020-03-18 03:27:51 +0200 • Implement AnimateEntry (used in PoP flash effect)
2020-03-18 02:29:02 +0200 • Tweak debug palette display
2020-03-18 02:27:32 +0200 • Implement SetEntryUsage (part of the PoP fixes)
2020-03-18 02:24:11 +0200 • No color translate if seeds match (fix PoP colors)
2020-03-18 02:19:39 +0200 • Implement AnimatePalette
2020-03-17 19:40:11 +0200 • Fix MakeITable buffer size bug at 5-bit resolution
2020-03-17 02:14:27 +0200 • Fix Entry2Index for animated palette entries
2020-03-17 01:09:16 +0200 • BIG PaletteMgr commit - first ActivatePalette pass
2020-03-17 01:05:39 +0200 • Implement (most of) SetEntries Color Manager call
2020-03-17 00:03:48 +0200 • Use TheGDevice defaults in MakeITable w/ zero args
2020-03-12 22:01:48 +0200 • 8bit clut debug overlay (to debug Palette Manager)
2020-03-12 21:56:06 +0200 • Implement (most of) PmForeColor/PmBackColor
2020-03-12 19:11:35 +0200 • Implement (most of) Entry2Index
2020-03-12 19:09:51 +0200 • Handle both index & sequence cluts in video driver
2020-03-12 17:25:54 +0200 • Add some missing color QD error numbers
2020-03-12 17:24:56 +0200 • Implement Index2Color in Color Manager
2020-03-11 03:19:45 +0200 • Update trap generator source CSV file too
2020-03-11 03:19:24 +0200 • Implement (most) of ActivatePalette (no updte yet)
2020-03-11 03:18:39 +0200 • Fix IODone invocation for SlotVideo DRVR driver
2020-03-11 03:17:46 +0200 • Fix byteswap bug in Color QD PortList insertion
2020-03-11 03:16:47 +0200 • Switch SetPalette to NSetPalette to use SInt16 arg
2020-03-11 03:16:25 +0200 • Implement (most) of SetPalette (no update yet)
2020-03-11 00:58:34 +0200 • Implement DisposePalette
2020-03-10 04:58:59 +0200 • Clear TmpResLoad at SetResLoad exit
2020-03-10 04:58:16 +0200 • Add empty stub for SetEntryUsage & AnimatePalette
2020-03-10 02:34:26 +0200 • Add gestalt function for 'vers' selector
2020-03-10 02:33:55 +0200 • Fix plotting of color icons in Dialogs
2020-03-10 02:32:49 +0200 • Add dummy SetEntries to Color Manager
2020-03-10 02:32:25 +0200 • Add PaletteDispatch & dummy Entry2Index & HasDepth
2020-03-10 01:52:01 +0200 • Add color QD old-style pattern patXor rect blitter
2020-03-10 01:51:09 +0200 • Add cmake JSON config for wolfenstein 3D
2020-03-10 01:10:52 +0200 • Update QDExtensions selector source csv too
2020-03-10 01:10:20 +0200 • Fix bug handling of version opcode in DrawPicture
2020-03-10 01:09:36 +0200 • Fix signatures of QDExtensions selectors
2020-03-10 01:08:09 +0200 • Add dummy SetCCursor for Glider 4 and Civilization
2020-03-10 01:07:09 +0200 • Add dummy HMGetHelpMenuHandle and Help Mgr module
2020-03-09 23:47:50 +0200 • Add $AB03 trap for 32-bit QuickDraw detection
2020-03-09 23:46:39 +0200 • Add cmake config for Color VETTE!
2020-03-09 22:21:59 +0200 • Partial DrawPicture bits opcode $9x color support
2020-03-09 22:13:15 +0200 • Add empty dummy MakeRGBPat placeholder
2020-03-08 21:32:21 +0200 • Make PICT opcodes $00 through $0B color-compatible
2020-03-08 21:29:45 +0200 • Fix WDEF 0 forecolor bug in monochrome mode
2020-03-08 03:03:28 +0200 • Support control colors in 'ictb' resouces also now
2020-03-08 03:00:51 +0200 • Add color QD Std/Fill/Frame/Paint/Erase/InvertOval
2020-03-08 02:41:23 +0200 • Init DrawPicture playback state for color ports
2020-03-08 02:39:59 +0200 • Fix invalid item index given for text colorization
2020-03-07 17:43:39 +0200 • Restore old colors after menu title draw
2020-03-07 17:14:45 +0200 • Load cctb in GetNewControl & call SetControlColor
2020-03-07 17:13:01 +0200 • Empty stubs for PmForeColor and PmBackColor
2020-03-07 16:48:05 +0200 • Fix swapped fore/background color in menu titles
2020-03-07 16:46:21 +0200 • Implement GetGDevice and SetGDevice
2020-03-07 16:24:30 +0200 • Dialog text & editfield 'ictb' color table support
2020-03-07 15:37:12 +0200 • Paint window background using 'wctb' wContentColor
2020-03-07 15:19:54 +0200 • Fix fallback of missing wctb entry to default wctb
2020-03-07 15:01:12 +0200 • Temporary placeholder for color desktop painter
2020-03-07 15:00:20 +0200 • Improve color QD CopyBits
2020-03-07 04:49:17 +0200 • Fix CopyBits case for WDEF 0 widgets
2020-03-07 04:02:30 +0200 • Makes text colorization work, but breaks CopyBits
2020-03-07 01:09:07 +0200 • Improve CDEF 0 colorQD support (cctb colorization)
2020-03-06 02:41:55 +0200 • Fix detection of color mode in WDEF 0
2020-03-06 01:57:51 +0200 • Draw colorized goAway box in WDEF 0
2020-03-06 01:44:48 +0200 • Implement partial CopyBits color QD compatibility
2020-03-06 01:03:42 +0200 • Improve WDEF 0 color compatibility (in progress)
2020-03-05 18:45:48 +0200 • First proto of color font renderer (srcOr mode)
2020-03-05 18:44:11 +0200 • Export QDRepeatPixels helper
2020-03-05 18:40:48 +0200 • Fix source scanline alignment bug in color stretch
2020-03-04 00:21:02 +0200 • Fix byte-swap bug in 1-to-32-bit pattern expansion
2020-02-26 22:52:01 +0200 • Extract B&W text renderer into a separate module
2020-02-26 22:49:52 +0200 • Move B&W rectangle blitter code to a new folder
2020-02-26 04:47:18 +0200 • Tweak RS local variables names to avoid conflicts
2020-02-26 04:46:38 +0200 • Abstract StdText for color QD & 255+ char support
2020-02-26 04:42:59 +0200 • Don't allocate storage for debug string in release

2 year anniversary of MACE! And some color progress & bonus

It is now two years since we started this project, and so far the progress is looking promising. At this point, it is good to take a brief overall look at where we are right now… so far, we have a lot of phase #1 goals accomplished:

  • Good enough 68000 emulation to run majority of games designed to use that CPU.
  • Majority of “classic” QuickDraw traps implemented to allow black & white games which needs them to work. Also hardware-level VIA page-swapping support for double-buffered games such as Dark Castle and Continuum.
  • Complete “.Sound” driver functionality, including ~99% coverage of low-level sound hardware emulation to allow games such as Dark Castle, Tetris and Pirates! to have working sound.
  • External file system emulation with HFS metadata support abstracted to ADF files, with almost all read/write operations tested working (except delete/rename, which have so far been rarely needed)
  • Basically implemented most of toolbox calls needed to, get out of the 87 test applications, 78 to work in at least somewhat usable way, and 43 to function near-perfectly.
  • Ability to run (or try running) the test applications/games as native OSX application bundles (and now with Windows support, also as windows EXE files), with full mouse/keyboard support, fullscreen/windowed and pixel-double support. Sound also mostly works but the SDL buffering needs some tweaking especially on windows…

As the toolbox is quite large, and there is a large number of traps/selectors which are rarely needed, and have not been encountered in the applications we have been testing vigorously. These APIs are still unimplemented, but they will be eventually added to the emulation. However, because these missing phase #1 features have such minor impact on most test applications, we also have started to work on some phase #2 features which are not only beneficial for a lot of current test suite, but which also will allow a huge number of new applications to be added to our tests:

  • 68020/030/040 emulation, which Pukka has already done a lot of progress on.
  • Color QuickDraw support, which was started after Christmas (more about that later in this post – very important for getting color games to work!)
  • Some preliminary progress on System 7.x APIs (FSSpec calls, Folder Manager, Time Manager, Script Manager, etc.).

Because of the fact that as we are implementing new features in a parallel fashion, we don’t have any fixed schedule for milestones. But realistically we expect to get a lot progress on the color support during the spring, which is the biggest bottleneck for getting much larger test application coverage. The downside of this is, however, that a “generic” emulator release will get delayed, because we want it to be as complete as possible, so that you won’t have to suffer from the incomplete features until we get everything polished. You can always follow the test application coverage (and overall progress) on our status page at https://mace.software/status/.

Color QuickDraw progress & first color game (somewhat) playable: KYE!

Since the previous post, majority of work as focused on getting source-mode blitting to work within the color hardware and Color QD API emulation. One of the easiest test cases for that purpose is a fun game called KYE, which was one of personal favorites of Toni on his LC II in early 90’s. The reason why this particular game is nicely suited for this early-stage testing is the fact that it uses mostly just PlotCIcon to draw all of its “sprite” graphics. Thanks to this, we did not have to work on a huge number of different calls at once, but were able to focus on getting that single call working. That way we could get something visible progress on the screen, instead of the invisible “under-the-hood” type of progress which has more impact on the long term.

For curiosity, below is a set of screenshots taken during the PlotCIcon development, which shows how the bugs were squished one by one until the rendering was finally okay:

Here’s a screenshot of latest stage of PlotCIcon functionality in KYE:

Level 3 of KYE

As you can see in the screenshot, icon rendering is working nicely, but text rendering is still completely missing. We also updated the WDEF 0 to have most of color support, so it uses now shading from the default ‘wctb’, leading to authentic System 7-style look and feel. Because of early stage of implementation, the color blitter has right now following limitations:

  • Blitter only works on “indexed” targets (1-8 bit pixmaps), i.e. not on “direct” (16/32-bit) screens
  • Only supports indexed sources too
  • Only simple srcCopy and srcOr modes supported (non-colorized)
  • No stretching support yet (only 1:1 scaling)
  • No arithmetic modes yet
  • Focus at this stage is on accuracy – that is, getting the output results to look exactly same as on the original, “real” Color QD – so performance is far from optimal for now. Leaves a lot of space for blitter optimization in future though…
  • Probably a lot of other use cases which I can’t recall right now…

Below is also a short video of level 2 gameplay:

Test run of level 2 of KYE (in 8-bit color mode)

Anniversary bonus! PT-109 gameplay video

To celebrate the two-year anniversary, we also recorded 90 minutes of PT-109 gameplay to show the current state of that game’s compatibility with M.A.C.E. below:

90 minutes of PT-109 campaign gameplay (16 missions)

This video shows what to expect when we get the “generic” emulator released some day in the future. For now, we can only share the video of this awesome game as it is sadly copyrighted – but we have a bunch of freely available games at our downloads page at https://mace.software/files for both Mac OS X and Windows 64-bit.

If you are interested in keeping up with our progress (now that we start the third year with full speed) you can follow this blog, or one or more of the following:

Full list of changes since last post

2020-02-23 22:32:57 +0200 • Add srcOr transfer mode to generic (=slow) blitter
2020-02-22 21:39:25 +0200 • Fix MOVE SR,-(A7) bug
2020-02-22 19:27:03 +0200 • Fix byteswap bug of ctSeed & tweak 2-&4- bit cluts
2020-02-22 18:51:04 +0200 • PenMode color QD compatibility
2020-02-22 18:50:30 +0200 • Add patXor mode for pixpat color rectangle blitter
2020-02-22 18:03:25 +0200 • Implement color QD versions of Get/SetPenState
2020-02-22 18:02:26 +0200 • Implement PenPixPat
2020-02-22 17:25:03 +0200 • Apply source mask to region scanlines when seeking
2020-02-22 17:24:06 +0200 • Fix align to destination in color srcCopy blitter
2020-02-22 17:21:57 +0200 • Fix b&w pixel data expansion being off by 32 bits
2020-02-22 17:19:46 +0200 • Add extra space after mask buffer for alignment
2020-02-22 17:18:43 +0200 • Keep rgn buffers 1-bit until destination expansion
2020-02-22 05:10:55 +0200 • Fix rowbytes calculation, cicns are now almost ok
2020-02-22 04:45:39 +0200 • Color blitter progress, KYE cicns almost visible
2020-02-22 02:33:59 +0200 • Region scanline to destination scaling functions
2020-02-21 22:50:17 +0200 • First successful pixel depth & clut translation
2020-02-21 22:17:11 +0200 • Get source & mask pixel data to translation buffer
2020-02-21 22:14:54 +0200 • Fix missing DerefHandle in PlotCIcon pixmap setup
2020-02-21 02:59:49 +0200 • More work on color blitter (PlotCIcon case init)
2020-02-18 01:02:13 +0200 • Progress on pixel translation in color src blitter
2020-02-17 17:05:51 +0200 • First colorized WDEF 0 parts (doc variant tested)
2020-02-17 17:03:33 +0200 • Fix missing deref of pixpat handle in color mapper
2020-02-17 16:18:49 +0200 • Fix assignment of WMgrCPort in InitWindows
2020-02-17 16:17:55 +0200 • Fix byteswap bug in PlotCIcon (b&w case detection)
2020-02-17 16:16:12 +0200 • Fix invalid portRect in InitCPort
2020-02-17 02:53:34 +0200 • Add RSAllocArray to allocate arrays in the scratch
2020-02-16 01:58:21 +0200 • Separate color QD CopyMask trap from "classic" one
2020-02-16 01:57:31 +0200 • Add dummy color stretch blitter & map use cases
2020-02-13 02:28:58 +0200 • Fix WindowManager colorQD CalcVis portBits mapping
2020-02-13 02:26:55 +0200 • Fix incorrect source rect passed in PlotCIcon
2020-02-13 02:01:51 +0200 • Half-dummy PlotCIcon, missing still src blitters
2020-02-13 02:00:49 +0200 • Fix window port bitmap size for color QD wCalcRgns
2020-02-12 02:24:35 +0200 • Fix MovePortTo (target rect did not map to pixmap)
2020-02-11 23:09:14 +0200 • Implement GetCIcon
2020-02-11 00:41:10 +0200 • Single-device colorQD DeviceLoop implementation
2020-02-11 00:29:28 +0200 • Improve WDEF 0 color compatibility for NewWindow
2020-02-11 00:20:50 +0200 • Fix default AuxWinHandle result of GetAuxWin trap
2020-02-10 23:46:56 +0200 • ColorQD version of BackPat
2020-02-10 21:25:14 +0200 • Fix wrong pattern given by QDDrawRegion to blitter
2020-02-10 06:25:48 +0200 • MovePortTo and PortSize colorQD compatibility
2020-02-10 05:37:21 +0200 • Fix colorQD multidevice StdArc drawing
2020-02-10 05:03:29 +0200 • Refactor 'MBDF' 0 for more color QD compatibility
2020-02-10 02:36:45 +0200 • Finish implementation of SetMCEntries
2020-02-10 02:16:13 +0200 • First (non-complete) InitPalettes pass
2020-02-10 02:15:26 +0200 • Add RSEnter/RSReturn pair to colorQD PenNormal
2020-02-10 02:14:46 +0200 • Fix RSEnter/RSReturn imbalance in QDDrawRegion
2020-02-10 02:14:11 +0200 • Tweak GestaltQDVersion selector result in color QD
2020-02-10 02:13:24 +0200 • Tweak default placeholder device mode
2020-02-09 23:05:22 +0200 • Tweak fake-ROM clut table seeds to match rsrc IDs
2020-02-09 03:38:12 +0200 • Implement NewPalette in Palette Manager
2020-02-09 02:33:13 +0200 • Implement GetNewPalette trap for Palette Manager
2020-02-08 17:09:07 +0200 • ColorQD compatible SetPortBits (no-op @CGrafPorts)
2020-02-08 17:08:02 +0200 • ColorQD SetOrigin (dereference CGrafPort pixmap)
2020-02-08 13:43:47 +0200 • Fix GrayRgn calculation in colorQD mode
2020-02-08 13:41:36 +0200 • Add ColorQD Region draw operations (non-masked)
2020-02-08 05:29:59 +0200 • Fix window manager clip bug in colorQD InitWindows
2020-02-08 05:27:57 +0200 • Fix detection of color port in ColorStretchBits
2020-02-08 04:54:31 +0200 • ColorQD Line and LineTo + line renderer
2020-02-08 02:42:58 +0200 • Implement ColorQD Move and MoveTo
2020-02-08 02:12:25 +0200 • ColorQD versions of PenNormal and PenPat
2020-02-08 02:02:08 +0200 • Fix CGrafPort/GrafPort target check for patterns
2020-02-08 02:00:44 +0200 • Start work on FillCRoundRect (PixPat expansion)
2020-02-08 00:01:45 +0200 • 8- & 16-bit scanline srcCopy & fix PixPat handling
2020-02-07 17:20:08 +0200 • 1, 2 & 4-bit scanline blitter and region expansion
2020-02-07 01:52:53 +0200 • Unify color QD and classic QD Arc draw traps
2020-02-07 01:44:43 +0200 • Generalize color QD pattern expansion for arcs too
2020-02-06 22:54:14 +0200 • Implement custom grafProcs support for Arc drawing
2020-02-06 22:36:47 +0200 • Refactor scanline blitters into separate module
2020-02-06 04:11:58 +0200 • Tweak base address and rowbytes for arc draw loop
2020-02-06 03:46:00 +0200 • Major region buffer refactor part #1 for color QD
2020-02-06 03:33:18 +0200 • Setup default mctb colors for drawing the menu bar
2020-02-03 22:58:37 +0200 • Implement GetMaskTable
2020-02-01 19:28:29 +0200 • Use OpenCPort instead of OpenPort in color QD init
2020-02-01 19:27:36 +0200 • Add RGBWhite/RGBBlack low-mem globals
2020-02-01 19:26:23 +0200 • GetForeColor/GetBackColor CGrafPort support
2020-02-01 19:14:41 +0200 • Implement GetMCEntry
2020-02-01 18:05:19 +0200 • Implement GetMaxDevice
2020-02-01 01:44:33 +0200 • Fix ShieldCursor/ShowCursor imbalance in QDDrawArc
2020-02-01 01:04:38 +0200 • Fix byteswap bug in rectangle region recording
2020-02-01 01:03:00 +0200 • Disable ROM write check for now, DungeonOfDoom fix

Happy Holidays!

It’s again the Christmas season, and time again for the annual holiday update, now for the second time! As our greeting to you, here’s the (apparently now traditional) Christmas tree easter egg screenshots from Dark Castle running the latest M.A.C.E. version (it appears only when the game notices that the system time is set to 25th of December in UTC time):

Dark Castle was one of the first games we actually tried M.A.C.E. on over one year ago, and it was already working quite well on the previous Christmas. At that time, the CPU bugs were preventing FireBall levels from being played, but luckily those issues were fixed during this summer, and now all the levels are in playable state.

There are however still minor hiccups, such as weirdly behaving robots, dungeon key being always on the right-most side in the Trouble 3 level, Mutants spawning too quickly, Burning Eye not shooting fireballs, etc. Pukka thinks a common denominator for these issues might be some random number generation code in Dark Castle, but it still needs to be analyzed further.

To celebrate the progress, we recorded a short video of Dark Castle gameplay (with Christmas tree in The Great Hall) on this Christmas Day for your entertainment – all rooms were visited, but sadly I was not lucky enough to topple the Black Knight off his throne this time, even after two tries:

Dark Castle running on M.A.C.E. (Christmas Day easter egg)

Teasers for 2020

Sadly the holiday season has been very busy, which has also slowed down the project progress a little bit. There’s still some teasers for upcoming features which are almost complete, but not yet ready for release:

MacTCP driver

After we tested Bolo in M.A.C.E., we got inspired by the network support it has and had a idea about trying to implement a simple MacTCP driver in M.A.C.E., which would allow us to try out Bolo’s network gameplay we used to play with long time ago. However, the non-standard IODone mechanism, and Bolo’s tricky network performance measurement code, there is still a bit of work to be done to get that into playable state. However, MacTCP Ping seems to be working already quite well, including the DNS resolver:

There is though a “record route” option in “Options” menu, which we could not test because for some reason even using the same option on the real ping (ping -R) on Mac OS X causes the echo packets to get lost.

A more proper introduction about how this all works will be added later when we get the entire driver to work. For now, at least UDP calls to the .IPP driver seem to be working on an “okay” level, although they have so far been really tested only with Bolo, and only for the very first couple UDP packets exchanged by it.

Windows support

As many people have requested, we are already experimenting with adding a third platform into the build system, Windows (from Microsoft, the notorious arch-enemy of Apple Computer 🙂

We already fixed a couple thousand build errors, but there is still a lot of work to be done. For example, the MSVC compiler has a lot of source-code level differences in the C compiler, which need to be abstracted to allow the code to compile both with LLVM/GCC and MSVC targets. Additionally, the networking, file system APIs – and a bunch of other things we have – are POSIX/Unix-only at the moment, which need Win32/64 equivalents to be implemented.

Beyond those two work-in-progress features, we are also still working on increasing stability through bug fixing and debugging. You can always follow the progress on this blog, and check the list of compatible applications in the “Status” page. Thank you for you interest in our efforts, have a merry Christmas!

Full list of changes since last post

2019-12-21 14:09:25 +0200 • Fix VerticalRetraceMgr byteswap bug in inVBL flag 
2019-12-21 14:08:18 +0200 • Add UDPWrite implementation to MacTCP emulation   
2019-12-20 03:14:50 +0200 • First successful UDPRead in MacTCP call (w/ Bolo) 
2019-12-20 01:00:52 +0200 • Implemented UDPCreate for MacTCP driver           
2019-12-20 00:01:36 +0200 • Add MacWWW test app (not working, needs color QD!)
2019-12-20 00:00:21 +0200 • Make MacTCP ipctlEchoICMP support async operations
2019-12-19 23:57:26 +0200 • Improve DA/DeviceMgr enums (accXXX, ioInProgress…)
2019-12-19 23:55:07 +0200 • Fix byteswap bug of dCtlDelay in SystemTask       
2019-12-18 19:22:56 +0200 • Disable unused 128-bit float test code            
2019-12-17 04:29:47 +0200 • Reinforce interrupt safety of device manager calls
2019-12-17 04:02:39 +0200 • Don't close the MacTCP driver                     
2019-12-15 05:23:27 +0200 • Add very primitive foundation for MacTCP driver   
2019-12-15 03:42:24 +0200 • Add a couple more kCStackBased mixedmode handlers 
2019-12-15 03:40:51 +0200 • Add missing prWrErr from earlier PRAM modification
2019-12-15 03:39:53 +0200 • Make RSReturnValue argument safe for function call
2019-12-15 03:37:15 +0200 • Add the DRVR 22 MacTCP (.IPP) driver to fake ROM  
2019-12-15 03:35:32 +0200 • Add MacTCP Ping test app to CMake JSON config     
2019-12-15 02:48:56 +0200 • Fix indexing for GetFileInfo/SetFileInfo          
2019-12-15 02:45:45 +0200 • Start work on kCStackBased MixedMode routine type 
2019-12-15 02:44:19 +0200 • Fix off-by-one-byte bug in FindFolder fld# handler
2019-12-13 03:25:39 +0200 • Add dummy ReadXPRam and WriteXPram for Bolo     

Bug fixing & stabilization

Since the previous update, focus has been mostly on improving the compatibility and stability of existing test applications through debugging, bug fixes and finishing some partially implemented features. This has so far had mostly effect on Excel, THINK Pascal and Fokker Triplane Flight Simulator:

Microsoft Excel 3.0 progress

Seems that Excel was complaining the out of memory error only because it could not locate the ‘PACK’ 6 resource (IntlUtils package). Adding a ‘PACK’ wrapper resource to System file, in similar fashion to the one which was added earlier for ResEdit as ‘PACK’ ID = 0, allowed this check to pass. After that a couple of new IntlUtils selectors were needed, with a couple file manager tweaks, and now Excel is able to start up successfully (albeit with a alert about not finding Excel, which can be passed).

It seems that a lot of tools and features are already functional, including basic worksheet creation, cell selection/modification, shape drawing, basic formatting etc. However, the most important feature, text input to allow entering data to worksheet cells, still requires TEDispatch to be implemented.

THINK Pascal 4.0 progress

One application which surfaced a lot of bugs and issues was THINK Pascal 4.0, here’s a rough summary of the issues found & ‘fixed’:

  • Reallocation of resources was not working properly in ChangedResource. Resource Manager did not save & restore active resource entry when measuring space available between current and next resource, which caused the new resource allocation in growth case to end up in wrong resource entry in the map (the next one was reallocated instead of current).
  • Removing name was attempted even if no name existed, causing resource names to get corrupted
  • RmveResource was not offsetting the types properly when removing the last instance of a given type.
  • The internal routine RGetResourceCount was trashing the resource entry pointer in resource manager’s stack state, causing some resources to be skipped altogether in iteration.
  • SetHandleSize was allowing locked blocks to move during the operation, which was explicitly told in Inside Mac documentation would not happen. This bug caused sometimes locked memory to move, with dereferenced pointers becoming invalid, causing crash during pascal code compilation.
  • A very rough approximation of MoveHHi was added. It works well enough to allow THINK Pascal to move resources out of the way to not prevent heap fragmentation from growing size of locked handles – but still causes sometimes fragmentation enough to surface this issue. However, this is for now enough to get the projects compile roughtly 2 to 3 times in one session before memory fragmentation kicks in and crashes the compiler.
  • The resource copy phase of THINK Pascal surfaced a bug in CountResources/GetIndResource, where CurMap was used instead of TopMap (CurMap should only be used when operating on 1-deep versions of the calls, Count1Resources/Get1IndResource). With this fix, the resource file copy phase succeeds.
  • Using “Transfer” command in THINK Pascal can be used to launch another app – in most cases, the application that was just compiled. However, the application zone teardown was – and still is – largely unfinished, having a number of issues. One that was fixed, was that resource manager attempts to release and purge all font caches with allocations in the application zone, which would be invalid upon launching the new program.
  • GetScrap trap had a minor issue, in which the case of hDest being nil it would crash, instead of just returning the scrap size as it was supposed to. This fixes the clipboard to (almost) work in THINK Pascal.

Now even a bit more complex programs can be compiled using THINK Pascal, for example one of Toni’s old games from as early as 1998. However, there are still minor glitches in various places:

  • Sometimes clipboard operation does not work on the first attempt.
  • Replacing existing application with “Build application” & replace dialog does not yet work because _Delete trap is still unfinished.
  • Sometimes text editing has very tiny minor selection glitches (when doing “Search again” in source code, where previous hit was selected and visible in area which was scrolled only little up, the old selection is left on when highlighting the new one).
  • Because resource map compaction is (still) unfinished, each time resources are updated and/or written in resource files, the file size grows indefinitely (by size of modified resource).
  • Compiling only works a couple times (2-3) on large projects, before heap fragmentation crashes the compiler.
  • The “Go” option does not yet work, because when running applications inside the THINK Pascal IDE, it does not actually launch a separate applications process for it. Instead, it loads the application “on top” of the pascal IDE, and in order to do this, it wraps a lot of its handlers to toolbox routines, and to do this, it manipulates the trap tables directly. This however assumes the toolbox trap table is located at 0xC00 on mac plus (0x75)-type machine, while it is currently located at 0xE00 (later machines). Because some currently used low memory globals overlap this area in non-compatible ways (for example, cursor device), they need to be adjusted a bit to behave differently on “Classic” type environment (like on real Mac Plus), and other way on later (slot-based / color-QD) environment.

Fokker Triplane Flight Simulator

It seems that the only issue causing Fokker Triplane to freeze upon starting new game was actually the lack of low-level interrupt handler emulation. The game attempted to override system VBL handler by adding its own VBL interrupt handler in the Lvl1DT low memory area containing the list of VIA’s Level 1 interrupt handler table, and as it was never called, caused the lock-up. The VBL, and 1-second timer, have now proper handlers in this low memory area, which is checked upon triggering the emulated VBL interrupt. This also includes the familiar performance optimization, where unpatched handlers skip the MixedMode interface with direct method call. It seems that with this change, the game is now fully playable with sound effects (although not thoroughly tested).

Full list of changes since last post

2019-11-16 04:08:45 +0200 • Lowlevel VIA interrupt handler for Fokker Triplane
2019-11-13 03:50:11 +0200 • Tweak SndNewChannel to not crash ResEdit          
2019-11-09 09:03:38 +0200 • Dummy OpenDeny/OpenRDeny (=>paramErr for local FS)
2019-11-09 07:51:53 +0200 • Workaround for mapping wideOpen Rgn in DrawPicture
2019-11-09 07:49:02 +0200 • Move File Manager commands to separate module     
2019-11-09 07:47:37 +0200 • Move SoundDriver test code to separate module     
2019-11-09 02:29:58 +0200 • Add dummy BitMapRgn trap for aWorm                
2019-11-06 05:40:10 +0200 • Respect port clipRgn in CopyBits                  
2019-11-06 04:31:42 +0200 • Fix edge cases in UnpackBits                      
2019-11-04 21:32:35 +0200 • If GetScrap argument hDest = nil, return only size
2019-11-04 11:31:38 +0200 • Clear font caches when closing res file w/ fonts  
2019-11-04 04:16:41 +0200 • Add IUMagString & improve Transliterate for Excel 
2019-11-04 03:09:38 +0200 • Fix Count…/GetIndResource to begin at TopMap    
2019-11-04 02:15:21 +0200 • Add memLockedErr enum missing from previous commit
2019-11-04 02:14:56 +0200 • (HACK) MoveHHi added - works, but not as in specs!
2019-11-04 02:12:08 +0200 • Fix SetHandleSize for locked blocks (don't move)  
2019-11-04 02:06:36 +0200 • Fix tail check in the zone check                  
2019-11-04 02:04:53 +0200 • Fix name allocation in AddResource                
2019-11-04 02:03:14 +0200 • StdFile: No "New folder" button in old dialogs    
2019-11-03 05:53:37 +0200 • More verbose heapcheck & optional free space debug
2019-11-02 18:13:37 +0200 • Fix possible TextEdit calibration memory move bug 
2019-11-02 17:40:30 +0200 • Fix resource map validation for maps with no names
2019-11-01 17:55:35 +0200 • Add dummy cstr2dec and pstr2dec selectors in Pack7
2019-11-01 17:54:15 +0200 • Don't trash ResourceEntry ptr in RGetResourceCount
2019-11-01 02:30:02 +0200 • Dummy IUMagWString & Transliterate(Text) for Excel
2019-11-01 00:43:41 +0200 • Add 'PACK' 3,4,5,6&7 mapping (Excel now starts up)
2019-10-31 21:33:21 +0200 • Resource fork compact placeholder code            
2019-10-31 01:01:48 +0200 • Fix RmveResource offset bug at last item of a type
2019-10-30 21:56:35 +0200 • Don't try to remove name if entry doesn't have one
2019-10-30 21:55:55 +0200 • Add map checks to Resource Manager calls for debug
2019-10-30 04:54:54 +0200 • Fix reallocation of resource in ChangedResource