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
Since the last update, there has been progress on many features, but especially on the following ones to highlight:
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):
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:
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.
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!
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)
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:
Also, here’s video of Wolfenstein 3D running (the lag is from QT video capture, game itself runs quite smoothly):
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
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:
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:
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:
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.
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.
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
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:
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.
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
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:
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:
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:
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:
One of the major features of phase #2, as we originally wrote in the milestone and phase plan two years ago, is adding support for Color QuickDraw emulation. Even though a lot of APIs considered part of phase #1 are still incomplete, the application compatibility and overall progress of project appears good enough to justify starting the work on that particular feature at this point. Nevertheless, all missing phase #1 features will be worked on simultaneously as they come up when testing the applications.
Adding color support will eventually allow us to test a huge number of new applications and games, and it will also allow trying out the existing ones in color modes. Especially games from the early 1990s have very good support for multiple color depths, so it should be interesting (for example, Civilization’s support for 1-bit and 256 colors, Railroad Tycoon’s 1-bit and 16 color support, Glider’s 16-color art, etc…)
First steps: The slot-based architecture
Originally Apple’s Mac II lineup had a quite different architecture from the old “classic”-type compact macs, which also reflects on how Color QuickDraw operates. Instead of dividing the memory space into four regions as in “classic” Macs (4mb RAM, 4mb ROM, 4mb I/O and 4mb VIA space), the slot-based models (in original 24-bit model) divide memory into 1mb “slots”, which are more dynamically assigned. For example, IM:Memory 3-6 describes the following model (in 24-bit mode):
0x900000-0xEFFFFF: Nubus slot addresses
That particular model fits quite well with the currently implemented 24-bit memory manager, so we use that as a starting point for Color QuickDraw machine emulation. It also allows us to partially emulate slow manager APIs (as slot numbers $9 through $E match their address space as on real Macs), and allows possibility for emulating multiple screen using multiple “virtual” slot manager cards, one for each screen. The drawback of this, though, is that only one megabyte is assigned for each video device in 24-bit mode, which limits usable VRAM to that 1 megabyte. What this practically means, is that these are the approximately maximum supported “standard” resolutions for each color depth:
1-bit (black & white): 3840 x 2160 (4K)
2-bit (4-color): 2560 x 1440 (QHD)
4-bit (16-color): 1920 x 1080 (FHD)
8-bit (256-color): 1280 x 720 (HD)
16-bit (32K colors): 832 x 624 (Mac 16″)
32-bit (16.7M colors): 512 x 384 (Mac 12″)
Of course, when we later someday add 32-bit memory manager support, we will have 256 megabytes per video device, and can get rid of this limitation.
The slot driver
One key component between the “virtual” slot-based video device emulation, and the Color QuickDraw, is the device driver for the slot device. In our case, we added the .Display_Video_MACE_FB driver (following Apple’s naming convention for slot drivers), which is used by QuickDraw’s and Color Manager to control video modes, color table, etc.
On real Macs slot manager would be responsible for iterating parsing sRsrc:s and other slot-specific data structures, but we forego those hardware-specific details and address the native video device data (currently SDL) through our platform-abstraction interface.
The DRVR calls are still important to implement properly, as they were quite standard on real Macs, and there might be apps using them directly, even though well-behaving apps should always use GDevice, Color Manager and Color QuickDraw API calls.
Platform abstraction for color video
As we already had prepared for adding color support when starting the project two years ago, most of the support for it existed already in the platform abstraction layer. There were a couple tweaks needed, but most work was just adding the output renderers for each of the new color depths (originally there was only 1-bit blitter, as it was the only color depth supported on classic Macs). This also included adding the color lookup tables in the pipeline, so that we are ready for Palette Manager when we get to the point of implementing it.
As there may exist any number of screens, with any resolution and various color depths, Color QuickDraw added the concept of GDevices. Each GDevice represents one screen/video card attached to the system, with its own screen buffer, color & gamma tables, etc.
Color QuickDraw allows drawing to all of these devices at once using the standard toolbox API, doing all the color conversion and addressing for the user. This is what we need to implement next also in our emulator.
One key component of Color QuickDraw is Color Manager, which is responsible for managing the color tables for each GDevice. What this means, that it creates and manages the inverse color lookup tables (which are used to map RGB colors to indexed colors), and handles those lookups. It also keeps track of seed values for color tables, which are used to determine when color tables have changed, which is important especially if a previously expanded pattern is drawn after a new color table has been activated. For now, we implemented a very basic ITable generation for allowing RGBColors to work on indexed color modes.
Inverse color-lookup table
As meantioned above, one key feature of Color Manager is the generation and management of ITab data structures, which are used to map RGB Colors back into color table indices in indexed video modes (2-, 4- and 8-bit depths). The generator is run in MakeITable trap handler, which takes handle of color table, handle of output inverse table, and desired channel resolution as arguments.
The inverse table is actually a RGB cube, where the cube’s channel size is defined by the number of bits given as the resolution; so for example resolution of 4bits gives 2^4 = 16, and the entire RGB cube would take 16x16x16 bytes which is 4096 bytes, or 4K of memory. As in three-dimensional XYZ space, RGB cube can be thought of in the same way; Each R, G, B coordinate are used to locate index in the cube’s 3-dimensional table.
When Color QuickDraw wants to get for example, index of RGB color #E39EA0, Color Manager would convert first the RGB components into cube’s resolution range (in this case, result would be (14, 9, 10]), and use those values of index the ITab data to get the value.
When the cube is generated by MakeITable, it is initially empty, but is given the seed values from the source color table; each seed value is the color lookup table index, placed at the RGB coordinate which it specifies. After this, the seed values are progressively iterated, so that each value “spreads” into adjacent RGB cube slots in any of the six axis directions (+R/-R, +G/-G, +B/-B). This is repeated as long until there are no longer any unfilled slots left in the RGB cube. This is familiar method from basic pathfinding, and some maze generation algorithms, and ensures that each RGB cube slot contains the index of color lookup table which is the closest available approximation for that particular RGB color.
PixMaps (and PixPats)
As BitMaps only supported 1-bit graphics, Apple added PixMap in Color QuickDraw to allow representing graphics of any bit depth using a standard data structure. Additionally, the GDevices use PixMap to represent the VRAM buffers, and PixPat (multi-color patterns) structure also uses PixMap as storage for the pattern data. And they also are by default implemented as Handles, which means they can be moved in the heap during compaction to prevent memory fragmentation (but require locking in certain cases).
The first step: Using legacy GrafPorts with Color QuickDraw
As Color QuickDraw has a lot of layers to provide backwards-compatibility for older applications, the first step was to start from the most basic one, legacy GrafPort support. As the very first call done to QuickDraw is to gray out the screen at startup, we focused on getting the most basic case for FillRect working at first. With adding support for pattern expansion to any pixel depth, and adding new srcCopy blitters, we got this fist monochrome output result after a couple weeks of coding:
When emulating the old-style GrafPorts, of of their interesting features to simulate was support for the 8 old-style QuickDraw colors (which map mostly to the colors used in ImageWriter printers with CMYK ribbon). With proper color mapping, and a couple days of banging the head against desk, we ended up with this result:
Second step: CGrafPort support
As mentioned earlier, the old-style GrafPorts were limited to only displaying those 8 colors, so to get the full range of RGB colors displayed, we had to add a proper CGrafPort support. This included implementing OpenCPort and InitCPort, and initialization of all related data structures. For example, all patterns in CGrafPorts are PixPat patterns, so we had to do a Pattern-to-PixPat conversion.
Most importantly, the fgColor/bkColor no longer represented the old-style color constants, but instead needed to be mapped to bit-depth specific index (on indexed device modes) or pixel value (on direct device modes). To control these colors, we implemented the RGBForeColor/RGBBackColor traps, which map the RGB values to the mode-specific values.
After a couple of days of more hard work, we now have the RGB colors working in CGrafPorts:
There is still A LOT of things to do before we can get much beyond simple rectangles on the screen, but the tasks should get easier as we go along. A lot of the routines (such as color mapping) can probably be shared as-is with most of other Color QuickDraw APIs. Some of the tasks next up are:
Adding region masking variant to the color blitter
Adding other pattern modes beyond patCopy
Adding source transfer modes (only patCopy done at the time of writing this)
Color versions of the special horizontal single-scanline blitters
A lot of other stuff
Full list of changes since last post
2020-01-31 18:02:57 +0200 • Basic support for "oldPat" PixPats in CGrafPorts 2020-01-31 16:35:14 +0200 • Implement InvertColor (default gdCompProc only!!!) 2020-01-31 13:47:55 +0200 • Some progress on CGrafPort colormapping & bugfixes 2020-01-30 02:10:42 +0200 • Add ColorQD Fore/BackColor & RGBFore/BackColor 2020-01-30 01:25:49 +0200 • Init default ColorQD PixPat patterns in InitCPort 2020-01-29 20:06:33 +0200 • Implement NewPixMap and NewPixPat 2020-01-29 01:42:41 +0200 • Initialize WMgrCPort (color port) in InitWindows 2020-01-29 01:41:59 +0200 • Implement OpenCPort and (mostly) InitCPort 2020-01-29 00:48:03 +0200 • Implement GetPixPat and GetCCursor colorQD traps 2020-01-28 22:12:56 +0200 • Implement DisposePixPat trap handler in color QD 2020-01-28 01:46:18 +0200 • Fix non-default colored patterns in 1-bit mode 2020-01-28 01:11:02 +0200 • ColorQD compatible GlobalToLocal/LocalToGlobal 2020-01-27 20:22:27 +0200 • Fix palette alignment issue in 8- and 15-bit modes 2020-01-27 20:20:38 +0200 • 15-bit (thousands of colors) SDL rendering support 2020-01-27 20:20:04 +0200 • 2-bit SDL output rendering support 2020-01-27 20:19:27 +0200 • Disable grayscale flag for now, test&fix it later 2020-01-27 20:18:37 +0200 • Fix last palette entry missing (zero-based count) 2020-01-27 13:33:46 +0200 • Add support for direct colors in color mapping 2020-01-27 13:26:34 +0200 • Set GDevice's gdType properly at initialization 2020-01-27 10:38:45 +0200 • GDev CLUT setup & rendering (first colors output!) 2020-01-27 09:44:47 +0200 • ColorQD ForeColor/BackColor in old-style GrafPorts 2020-01-27 09:43:56 +0200 • Fix initialization of QDColors low-mem global 2020-01-27 04:59:25 +0200 • Use Color2Index in color mapping for correct color 2020-01-27 04:56:41 +0200 • Set GDevice's gdResPref in the InitGDevice handler 2020-01-27 04:39:29 +0200 • Color2Index proto (no hidden color handling yet) 2020-01-27 04:36:27 +0200 • Fix the one-entry off "black-most black" index bug 2020-01-27 04:11:57 +0200 • Finish the first proto of MakeITable 2020-01-27 03:19:38 +0200 • Remove unneeded mitq resource from build 2020-01-27 03:18:51 +0200 • "Plant" seeds for the ITab generator from the clut 2020-01-26 00:24:21 +0200 • Start work on MakeITable 2020-01-26 00:23:50 +0200 • Tweak pattern blitters, preparing 8-bit support 2020-01-26 00:22:14 +0200 • Dummy Color2Index stub, prep use in colormapping 2020-01-25 17:05:21 +0200 • Hack 4- and 8-bit (16 & 256-color) output support 2020-01-25 17:01:45 +0200 • Fix old-type pattern to 8-bit conversion 2020-01-25 16:55:25 +0200 • Fix mask calculation for non-1-bit rectangle blits 2020-01-25 02:21:23 +0200 • First simple non-region FillRect case for ColorQD 2020-01-25 02:20:38 +0200 • Block attempting to post events before InitEvents 2020-01-25 02:19:04 +0200 • Fix the "dummy buffer" string RSAlloc overflow 2020-01-24 02:35:50 +0200 • Some progress on color blitter rectangle culling 2020-01-24 02:34:20 +0200 • Add QDErr low-mem global 2020-01-24 00:05:55 +0200 • Do CQD old 1-bit pattern to b&w GrafPort expansion 2020-01-23 00:18:35 +0200 • First CQD color mapping pass for old-type GrafPort 2020-01-22 17:53:29 +0200 • A bit of work on the color QD color mapping 2020-01-21 01:32:09 +0200 • Implement portBits to PixMap conversion to colorQD 2020-01-21 01:30:38 +0200 • Init lot of lowmem globals for default videodevice 2020-01-21 01:27:42 +0200 • Fix byteswap bug on device depth in CVGetVidParams 2020-01-20 15:02:02 +0200 • Refactor QD a bit in preparation of color support 2020-01-20 02:34:13 +0200 • Disable for now dirtyrect optimization in color QD 2020-01-20 02:22:37 +0200 • ColorQD versions of InitPort and OpenPort 2020-01-20 01:33:36 +0200 • Save LastMode/-Fore/-Back/-Depth in FMSwapFont 2020-01-20 01:32:29 +0200 • Fix two indexing bugs in ColorVideoInitOneSlot 2020-01-20 01:30:00 +0200 • Implement most of InitGDevice trap for color QD 2020-01-20 01:28:50 +0200 • Add empty stub for MakeITable trap 2020-01-19 23:29:53 +0200 • Add GetDeviceList trap 2020-01-19 20:37:49 +0200 • Add grayscale flag to video devices 2020-01-19 14:36:11 +0200 • Fill in GDevice's VPBlock from color video driver 2020-01-19 14:35:34 +0200 • Fill in DCE slot info in Open call for slot device 2020-01-19 05:03:02 +0200 • Add one more missing ROM clut resource 2020-01-19 05:02:32 +0200 • Add DisposePixMap, New/InitGDevice, GetNextDevice 2020-01-19 04:59:55 +0200 • Use cmake source_group TREE to clean up projects 2020-01-19 04:59:08 +0200 • Add MacVideo header 2020-01-18 23:54:18 +0200 • A couple more CQD resources (gama, mitq, cluts) 2020-01-18 05:51:16 +0200 • Add unit table debug dump tool to device manager 2020-01-18 05:50:37 +0200 • Add "virtual" slot DRVR installation support 2020-01-18 04:29:39 +0200 • Tweak video driver name & fix default slot amount 2020-01-18 04:26:22 +0200 • Implement DoVBLTask trap (untested) 2020-01-17 17:27:46 +0200 • Add SlotManager module + slot queue initialization 2020-01-17 01:52:09 +0200 • Implement color version of InitGraf 2020-01-17 01:28:37 +0200 • Add GetCTSeed/GetCTable/DisposeCTable to ColorMgr 2020-01-17 01:18:38 +0200 • Add TableSeed and HiliteRGB low-mem globals 2020-01-17 01:17:59 +0200 • Add default 'clut' tables to color ROM resources 2020-01-16 01:50:16 +0200 • Clean up linker errors for missing color QD stubs 2020-01-16 01:43:16 +0200 • Add setup of menubar 'mctb' color table (untested) 2020-01-16 01:35:33 +0200 • Empty stubs for GetCIcon, PlotCIcon & DisposeCIcon 2020-01-16 01:27:38 +0200 • GDevices module & GetMainDevice/GetMaxDevice stubs 2020-01-16 01:20:13 +0200 • Add empty stub for _ActivatePalette 2020-01-16 01:15:39 +0200 • Empty stubs for Delete/SetMCEntries & InitPalettes 2020-01-16 01:06:12 +0200 • Tweak ClassicSound to not fail colorQD compilation 2020-01-16 00:56:30 +0200 • Tweak some CMake configs for color-only apps 2020-01-16 00:55:31 +0200 • Refactor VBL code out of VIA + add slot# to video 2020-01-15 02:52:16 +0200 • Improve compilation of QDExtensions with color QD 2020-01-15 02:41:14 +0200 • Improve Menu Manager color QD compatibility 2020-01-15 02:40:40 +0200 • FMSwapFont color QD tweaks & LastSPExtra type fix 2020-01-15 02:36:37 +0200 • Fix ClassicSound compile error w/o Sound driver 2020-01-15 00:49:29 +0200 • Separate Mono & Color fake roms + add 32-mode flag 2020-01-15 00:47:24 +0200 • Add the DRVR 120 (.Display_Video_MACE) to fake rom 2020-01-15 00:45:59 +0200 • Add color video initialization call to boot code 2020-01-15 00:44:02 +0200 • Add stub for the color video driver 2020-01-15 00:42:54 +0200 • Add symbol name to binary-to-C converter
As mentioned in the earlier posts, a large amount of this Christmas vacation was spent on the Windows version of M.A.C.E. runtime, and creating something for Windows users to try out. Now all the core work has been done, and we have the first prototype of the Windows port of runtime – with all of the existing test applications now available also as Windows executables. Now, there are a couple important points:
The windows executables are currently built only for the 64-bit x64 architecture
They have only been tested on Windows 10 (and only on Toni’s brand new 3.06Ghz Xeon W3550, and whatever processor Pukka’s new PC has). We have no idea on what other computers they work (or do not work)
You might want to avoid running them under certain virtualization software applications, as at least on Toni’s VirtualBox the performance was… not very stellar, at least compared to a physical PC without virtualization.
The PC keys are (for now) mapped permanently as follows:
Left alt = Left command
Left ctrl = Left option
Right alt = Right command
Right ctrl = Left control
Under windows 10, the “windows square” key (between Ctrl and Alt) cannot be used by the emulator as command or option key, because the Windows OS doesn’t seem to allow it to be fully captured (only partially).
AltGr key does NOT work as Right alt, because on Windows AltGr actually simulates Left Ctrl + Left Alt key presses. We need to investigate this more in the future.
The filesystem package is cached under Users -> username -> AppData -> Roaming -> MACE, with individual cache folder for each pre-packaged test application. So, if you for example create cool Continuum Galaxy files, this is where you’ll find them. And as AppleDouble files, they are exchangeable between M.A.C.E. on Windows, M.A.C.E. on Mac OS X, and theoretically (but not tested) with the Executor emulator which also uses AppleDouble files.
Below is a screenshot of the currently available test apps running on Windows 10:
If you have Windows, you can right now try them out in the Downloads section on this page.
Screen mode control: Full-screen mode and pixel doubling
Another neat new feature that was added to the new M.A.C.E. runtime version, besides the Windows compatibility, is the ability to switch between windowed/fullscreen modes on the fly, and also toggling the pixel-doubling feature. The shortcuts for these are:
Cmd+Shift+1: Toggle pixel doubling mode
Cmd+Shift+2: Switch between windowed and full-screen modes
These keyboard shortcuts were chosen (for now) as they should conflict very little with existing Mac applications, as they were used as disk eject FKEYs on real Macs.
This new feature has been both updated into the existing Mac OS X test app bundles, as well as in the new Windows versions.
Full list of changes since last post
2020-01-07 00:39:56 +0200 • Skip unwanted packaged VFS entries
2020-01-06 23:40:32 +0200 • Don't cache OSX 10.6 vs 10.9 target in CMake
2020-01-06 20:32:52 +0200 • Fix typo in scaline range check in _StretchBits
2020-01-06 19:10:24 +0200 • Bump runtime version & tweak version info format
2020-01-06 07:08:39 +0200 • Load package VFS from Win32 resource on Windows
2020-01-06 07:07:18 +0200 • Include dynamically generated .rc in win32 targets
2020-01-06 07:06:34 +0200 • Fix encoding of special symbols in two test apps
2020-01-06 06:05:01 +0200 • Add extracting VFS archive in initialization code
2020-01-05 04:30:25 +0200 • Add file archive reader, and clean up CMake files
2020-01-04 23:20:46 +0200 • Sign-extend <32bit args to prevent ARM optimizat..
2020-01-04 04:18:12 +0200 • Try fix Raspberry hMenu bug, enforce 16-bit menuID
2020-01-03 22:22:10 +0200 • Lock SDL window data during screen mode switch
2020-01-03 21:52:42 +0200 • Refactor display toggles to use DynamicConfig keys
2020-01-03 21:50:30 +0200 • Add first part of DynamicConfig system (UserPrefs)
2020-01-01 17:54:41 +0000 • Disable JSON parser tests from build
2020-01-03 01:20:14 +0200 • Fix DynamicConfiguration JSON dependency + bin dir
2020-01-03 00:39:24 +0200 • Merge branch 'master' of
2020-01-03 00:39:21 +0200 • Add missing header search path for JSON lib
2020-01-03 00:36:54 +0200 • Fix OSX target, CMP0066 and set SDL2 debug/release
2020-01-02 23:08:12 +0200 • Merge branch 'master' of
2020-01-02 23:08:06 +0200 • Specialize OSX Cmake config to 10.6 and 10.9 bases
2020-01-02 20:36:10 +0200 • Add JSON parser to the MACE runtime (for configs)
2020-01-02 19:09:33 +0200 • Also fix the Mac icns for previously invalid icons
2020-01-02 18:51:14 +0200 • Add stub for DynamicConfiguration module
2020-01-02 18:50:30 +0200 • Sanitize Windows key mappings to be more usable
2020-01-02 04:13:26 +0200 • Add ICO files to EXEs, & use console only in debug
2020-01-02 04:11:18 +0200 • Use debug/release SDL2 lib depending on app target
2020-01-02 04:09:56 +0200 • Reconvert Windows ICO files
2020-01-02 04:09:39 +0200 • Fix incorrect icon assignments of couple test apps
2020-01-02 04:08:20 +0200 • Make SDL2-static compile on VC release mode
2020-01-02 00:51:30 +0200 • Add processing of Windows ICO files
2020-01-01 23:49:58 +0200 • Fix trap glue generator to use new byteswap macros
2020-01-01 23:48:56 +0200 • Refactor cmake to use offline icon conversion
2020-01-01 20:39:58 +0200 • Add lpng 1.6.37 to ThirdParty external libraries
2020-01-01 17:10:36 +0200 • Force redraw of screen on SDL expose events
2020-01-01 15:38:09 +0000 • Haiku compilation fixes
This is just a quick status update to celebrate the new year 2020. As teased in the Christmas update one week ago, there has been some progress on the cross-platform ports of M.A.C.E., and this update is just to give a brief glimpse of the state of Windows and Raspberry ports (with a new year celebration theme):
Platform port status: Raspberry PI
Thanks to the hard to work and big efforts done by Pukka on the Raspberry PI port this year, we finally got it to the stage where Toni was able to integrate the platform into CMake build system, and create working builds for the test applications. Pukka found some performance issues in the SDL rendering, which motivated Toni to also get a Raspberry PI to help debug and identify the problem.
It was figured out, that the SDL2 graphics implementation we had previously used had serious issues, and was rewritten mostly to remove dependency on SDL surfaces, using instead SDL texture for the rendering. With this change, the performance on Raspberry improved to the point of matching the Mac (and Windows) platforms. Additionally, we took this opportunity to improve the fullscreen & pixel-double rendering code to the point that they are also almostready for public testing.
However, for some reason sound does not yet work on the builds done by Toni on Raspbian 10, although they seem to work on Pukka’s Raspbian 8. This need some more investigation, alongside some other issues on the platform. The basic X11 view driver + software renderer driver combination seems to offer however a good solution for the time being.
Platform port status: Windows
The Windows port, which we teased one week ago in the Christmas update, has advanced quickly and will soon be ready for testing. It took in total one week (the Christmas vacation) for fixing the code for MSVC compiler compatibility (a couple thousands errors), and getting the builds to run. The changes we needed to make include:
Fixing problems with zero-size struct arrays
Lack of typeof(x) macro leading to need to refactor all byte-swapping and RSAlloc macros (and places where they were used)
A couple header changes (such as alloca being defined in different headers on POSIX vs. MSVC)
Adding some Windows API code for file system iteration and manipulation alongside of POSIX/Std C code
Fixing some bugs that were surfaced by the new port, but were affecting all platforms
Other minor changes (clock API, refactoring unistd references, tweaking CMake configs, etc…)
The remaining tasks for first Windows test release are still integration with Windows executable resources, and storage of the NativeFS data on windows builds.
The year 2020 should definitely bring us to the point of releasing a more generic way to run M.A.C.E., including additional platform support, and compatibility with much more applications. At the moment the focus is – beside adding the new platform support – on getting as many of the known issues in the current test applications fixed (which you can follow in our status page). But looking forward to the stage #2 of project, we also hope to start work on Sound Manager and Color QuickDraw implementation in the second half of 2020.
Full list of changes since last post
2020-01-01 02:31:53 +0200 • Fix order of debugger setup in environment headers
2020-01-01 02:18:32 +0200 • Set MemErr to noErr if GetHandleSize succeeds
2020-01-01 02:17:18 +0200 • Add Finnish Apple Macintosh Basics as test app
2019-12-31 22:49:19 +0200 • Fix byteswap sign bug in CalcMask/SeedFill
2019-12-31 04:47:15 +0200 • Only grab input in fullscreen mode
2019-12-31 04:12:39 +0200 • Merge branch 'master' of
2019-12-31 04:12:34 +0200 • Fix GCC byteswap macros for raspberry pi
2019-12-31 03:59:25 +0200 • Use left control as command key on windows
2019-12-31 01:46:39 +0200 • Refactor SDLPlatform to use Textures, not Surfaces
2019-12-31 00:07:32 +0200 • Merge branch 'master' of
2019-12-31 00:07:13 +0200 • Update CMake configs and MacTCP for raspberry pi
2019-12-30 22:25:41 +0200 • Merge branch 'master' of
2019-12-30 22:24:27 +0200 • Fix buffer overflow in StretchBits dstScanlineBuf
2019-12-30 21:43:20 +0200 • Fix case-sensitive FS filename issue in CMake file
2019-12-30 02:07:02 +0200 • Fix+optimize pixel-double and fullscreen rendering
2019-12-29 22:41:31 +0200 • Merge branch 'master' of
2019-12-29 22:41:21 +0200 • Fix Windows build audio issue (SDL buffer format)
2019-12-29 22:39:38 +0200 • Fix crash: Add missing Open/OpenDeny error checks
2019-12-29 03:57:01 +0200 • Fix debug strcat in AVLTree.c for Mac version
2019-12-29 03:33:38 +0200 • Refactor byteswapping (& clean up lot of warnings)
2019-12-29 03:25:58 +0200 • Enable console mode for now in MSVC (for debug)
2019-12-29 03:25:18 +0200 • Fix signature of argc argument in main method
2019-12-28 23:36:15 +0200 • Fix bug in path separator conversion in MSVC build
2019-12-28 17:32:02 +0000 • Fix some sign bugs, 1000 miles now starts on Win32
2019-12-28 17:29:58 +0000 • Use MSVC built-in byteswap macros for byteswapping
2019-12-28 17:28:21 +0000 • Fix SDL main & set executable as a Windows GUI app
2019-12-28 15:25:55 +0200 • Fix malloc.h/alloca.h header includes for MacOS
2019-12-28 15:02:36 +0200 • Merge branch 'master' of
2019-12-28 15:02:31 +0200 • Clean up misc debug macros etc before win32 merge
2019-12-28 02:22:10 +0000 • A MAJOR Windows and MSVC compatibility update
2019-12-27 21:59:06 +0000 • Fix potential timestamp conversion shift overflow
2019-12-27 21:56:14 +0000 • Fix byteswap bug in fractional pen location init
2019-12-27 00:39:38 +0000 • Don't try to return value from void function
2019-12-27 00:00:32 +0000 • Fix wrong data size in low-mem Rect setter macro
2019-12-26 23:00:41 +0000 • Merge branch 'master' of
2019-12-26 23:00:27 +0000 • Ignore MacOS-specific files in MSVC cmake targets
2019-12-26 22:58:38 +0000 • MSVC compatible SDL clock (and rotate macros)
2019-12-27 00:09:04 +0200 • Init PortList and ChunkyDepth
2019-12-26 21:18:10 +0200 • Improve InitApplZone, add some CQD low-mem globals
2019-12-26 21:09:34 +0200 • Add proper alpha to SDL RGB output (->pixeldouble)
2019-12-26 21:08:03 +0200 • Add temporary IODone stack hack for MacTCP driver
2019-12-26 21:04:59 +0200 • Use new enum for killCode in Sound Driver
2019-12-26 21:04:20 +0200 • Add more logging to .IPP driver
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:
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:
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.
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
Recently, somebody was asking on Emaculation forums, what would happen if Apple’s Finder would be attempted to run in M.A.C.E.? That was an interesting question, which motivated us to try it out.
Mac System Software architecture
To think about what would make Finder work, let’s consider the classic Mac system software as an architecture consisting of roughly three layers (in real Macs):
ROM: Most of Toolbox APIs, ROM resources and stage 0 boot loader.
System: Patches to ROM, extensions, system zone, the so-called “kernel” of old MacOS.
Finder: The “desktop metaphor” front-end running as a regular Mac application.
This categorization is very naïve, does not consider details such as role of hard drive drivers in boot process, etc. Additionally, M.A.C.E. combines roles of ROM and System as a single entity implemented in native code.
The interesting part to highlight is how Finder is basically “just another” application running on the System, and was even replaced by alternate startup applications on the old Macs (such as MiniFinder, MultiFinder, or other applications using the “Set Startup” option). As such, especially on System 6.x and older, the undocumented dependencies between System and Finder might be few in number, if any.
The first run
So, the question was, what would happen if we would try to run it? Well, we got this far on the first attempt, and with a couple minor fixes to progress further:
So, almost there. What we needed was a couple new (missing) routines and some fixes:
Fixed the 0x16 and 0x17 csCodes for .NativeFS driver, which return the logical/physical ICN# data for the volume icon (as seen on the desktop). We actually had that icon already one year ago, but this was the first time anything wanted to access it. 🙂
Added working directory indexing to GetWDInfo, which Finder uses to close all open working directories, presumably left open by misbehaving applications under System 6.x.
Fixed a buffer overflow bug in GetVolInfo (in volume name).
Implemented File locking APIs, which Finder wants to use to maintain the Desktop file.
Getting to the desktop
After a long and tedious session of debugging, it was discovered that due to a stupid bug in GetWDInfo Finder was crashing upon attempting to enumerate volumes. After that fix, we got nice Finder desktop, and a lot of functionality already working:
Operating on the Finder windows added need to implement a couple other missing traps, although as dummy versions for now (SetCatInfo and SetVolInfo, which Finder attempts to use to write metadata about modifications done in the spatial finder windows, icons, etc). Some points:
Finder and system icons appear as documents, but that might be because those don’t yet exist in the System file. Not sure about that yet.
It’s nice to see how a Finder 6.1.8 from Apple’s real System 6.0.7 behaves nicely even though M.A.C.E. System declares being version 7.0. 🙂
For some reason, doing “Get Info” on our Hard Drive turns our custom icon returned by the .NativeFS DRVR to a generic floppy icon.
It’s interesting how Finder considers at the moment our custom Hard Drive as “AppleTalk” device, but that might be because we’re hooking into the ExtFS file manager hooks which *I think* were used by AppleTalk in the real System 6.x. Just another thing which needs more investigation.
The modification and creation dates shown in “Get Info” (and list-style finder windows) use International Utilities date & time formatting functions, which are still placeholders. And as such, they only display mostly the numeric value of date-time instead of the proper, human-readable format.
Making the Desktop file work
At this point, we didn’t yet get the proper application and document icons to appear, so we did a bit more debugging on what was happening with the Desktop file – which Finder uses to keep track of known application creator & types, file comments, etc. It turned out, that we accidentally had all the “hasBundle” (0x2000) bits turned off in applications, which is why they were not detected by Finder.
As this issue was fixed, Finder started to process the applications properly, and quickly needed a some improvements to Resource Manager APIs. Mostly, it wanted to use UniqueID to allocate unique IDs for resources inside the Desktop file’s resource fork (to avoid conflicts). After that, updating Desktop file seems to work quite nicely, resulting in some fancy icons now appearing in the Finder under M.A.C.E.:
For now, running the real Finder remains as a curiosity, but nevertheless works as a great test case for a various number of Toolbox File Manager APIs which still need work (among some other minor bugs). The summary of the major known issues is:
The launching of programs “almost” works. Everything else appears to be fine, but it suffers from the same issue as previously found out using the “Transfer” command in THINK Pascal: The Font Manager data caches do not clear completely, leaving some dangling handles/pointers to the old application zone, which cause crash on attempting to reference them after the zone has been reinitialized for the new application.
Getting back to Finder (or any shell) is not yet possible, as ExitToShell is still hard-coded to terminate the entire emulator, instead of launching LMGetFinderName() application. Getting this to work would also encourage researching the Emscripten and Process Manager compatibility, as all of those features share a common need for a better in-emulator process management.
SetCatInfo/SetVolInfo are still dummy placeholders, so Finder is trying to use them to update metadata, though it is not yet saved.
Folder creation (_DirCreate), File/Folder deletion (_Delete), renaming (_Rename) are not yet implemented, so attempting those operations on Finder will still fail.
The _Eject trap is not yet implemented (and in any case you will not be able to eject the NativeFS drives).
As previously pointed out, Date & Time formatting does not yet work
The “Rebuild Desktop” operation (though using option + cmd keys at startup) does not yet seem to do the actual rebuild on a “fresh” start (i.e. if Desktop file has been wiped). Additionally, attempting that operation while old Desktop file exist will error out because _Delete is unimplemented, and old file cannot be removed out of the way.
Maybe other issues too, those are just the ones found out in the quick testing.
The “generic” M.A.C.E. environment might benefit of this though, as a replacement shell and/or program launcher, that could be optionally used by the end-user.
Full list of changes since last post
2019-12-12 18:19:41 +0200 • Add UniqueID/…1ID, to allow Desktop file updates 2019-12-12 17:49:18 +0200 • Add Disk Initialization Pack2 to keep Finder happy 2019-12-12 17:46:55 +0200 • Fix byteswap bug in NativeFS _Allocate handler 2019-12-12 15:00:12 +0200 • Add missing NativeFS.c changes for previous commit 2019-12-12 04:34:28 +0200 • Add dummy SetCatInfo and SetVolInfo selectors 2019-12-12 04:02:48 +0200 • Fix GetWDInfo bug (ioVRefNum & ioWDVRefNum mixed) 2019-12-09 02:58:47 +0200 • Fix memFullErr check in SetApplLimit 2019-12-08 06:31:06 +0200 • Fix filename overflow in GetVolInfo NativeFS call 2019-12-08 06:30:06 +0200 • Implemented CloseWD 2019-12-08 06:29:03 +0200 • Add WD indexing to GetWDInfo 2019-12-08 06:27:20 +0200 • Add Finder test app to cmake configs 2019-12-08 06:27:01 +0200 • Implement icon csCodes in NativeFS Control call 2019-12-08 06:25:52 +0200 • Make more macros in memory manager MSVC friendly 2019-12-08 06:25:18 +0200 • Add dummy SetFilLock and RstFilLock 2019-12-08 06:23:36 +0200 • Fix FinderName lowmem global 2019-12-06 23:44:06 +0200 • Add Bash Big Blue to cmake config for testing 2019-12-04 21:21:36 +0200 • Fix QD_LOG to respect debug settings 2019-12-04 20:48:17 +0200 • Add Cairo ShootOut! to cmake config for testing 2019-11-30 02:02:05 +0200 • Fix empty VA_ARGS problem in MaceLog macro 2019-11-29 23:55:30 +0000 • Make SWAP and MIN/MAX macros MSVC compatible 2019-11-29 23:54:08 +0000 • Made vararg ellipsis parameters MSVC compatible 2019-11-29 23:52:21 +0000 • Make Memory Manager return macros MSVC compatible 2019-11-29 23:51:27 +0000 • Make ROMScratch macros MSVC compatible 2019-11-29 23:50:08 +0000 • Move SwapPoint to MacQuickDraw.h to make it inline 2019-11-29 23:48:05 +0000 • Change void* to UInt8* in fake ROM (for MSVC) 2019-11-29 23:46:50 +0000 • Make SANE conversion macros MSVC compatible 2019-11-29 23:33:03 +0000 • Merge branch 'master' of 2019-11-29 23:32:43 +0000 • WinAPI EndianXX_Swap macros 2019-11-30 01:30:54 +0200 • Add UInt128 type to EmuMacTypes.h
Before Macintosh was created, there was a computer architecture called IBM PC. With Intel 8086 processor, it was incompatible with the Motorola 68000 family used in Macintosh computers – and thus, no IBM PC software would work in Macintosh. But there were some really smart people, who created a special application called SoftPC in mid-80’s, which interpreted Intel’s x86 instructions on the fly, and emulated enough PC architecture and BIOS ROM to allow those programs to run on Macintosh. And now, SoftPC finally also works on M.A.C.E.
SoftPC 2.51 architecture
The version of SoftPC we got to run is 2.51, which happened to be compatible with the “Classic”-type 68000 Macintosh computers, one which M.A.C.E. aims to emulate in the Phase 1. That is, it works on 68000 processor, supports the 1-bit “classic” QuickDraw on 512×342 screen, and appears to be compatible with System 6 level Toolbox calls.
The IBM PC architecture which SoftPC 2.51 emulates is IBM XT with 640 kilobytes of RAM, and a CGA monochrome display. It also supports two serial ports (although M.A.C.E. serial port drivers are still unfinished to try them out), a printer port (no printing support for us yet), two hard drives (through disk images), and two physical floppy drives (which we don’t either emulate yet).
The XT memory map
The challenging part of getting SoftPC to work was ingenious way it emulates the PC memory map. As everybody knows, IBM PC has physically 20-bit addressing scheme (through 16-bit segment and offset register pairs, which give 4+16 bits of usable virtual address space, as there is overlap between segments). This 20 bits equals 2^20 = 1048576, or 1 megabyte of address space. What SoftPC does, is that it allocates this entire 1 megabyte area to be linearly accessible throughout the physical Macintosh address space, but it saves memory by allowing this area to have “holes” in it for the non-used areas of the PC memory map. This is basically the layout it creates:
0B8000-0DDFFF: CGA video memory
0F0000-0F4FFF: ROM BIOS #1
0FE000-100000: ROM BIOS #2
The steps it uses to ensure this linear layout is created is quite unique, and a good challenge to test the memory manager implementation:
For starters, the availability of large enough linear memory space is ensured by doing allocation of 1048576+32 bytes of memory using NewPtr. If this fails, it will know that there won’t be enough memory.
The allocated space is shrunk down to the 640K+32 RAM size using SetPtrSize. (The 32 bytes extra is used for aligning the actual addresses inside allocations to 16-byte boundaries for apparently memory access speed optimization on later Macs).
The three other blocks (CGA memory and two ROM areas) are allocated at correct locations using the following algorithm:
The size of “hole” preceding the allocation is calculated. For example, having video memory at B8000 would leave 18000 bytes space between A0000 and B8000.
Two pointers are allocated after each other using NewPtr: one for the hole (using calculated hole size), and the actual memory block (+32 bytes for alignment).
Now this is where the magic happens: If the latter allocated block’s start would not be within alignment range of the required offset (in CGA case B8000) from start of RAM (the 640K block), the size of hole would be decremented with 16 bytes, the two blocks would be disposed, and allocation re-attempted at step 3-2.
After repeating steps 3-2 through 3-3 enough so that required range is reached, the pointer to the allocated hole block is saved, and next one of the three blocks is allocated starting from step 3-1. (It should be noted, that because of a very minor bug in M.A.C.E. memory manager, the allocation size failed to decrease, and this loop would be terminated after 64 attempts, with incorrect block left allocated.)
After all three blocks have been allocated at correct offsets, the holes preceding each of them would be disposed using DisposePtr. This part of process leaves space inside the emulated PC address space, which the Toolbox can use for any regular memory allocations – pointers and handles, even resources. It is not 100% certain, but it may be that SoftPC may optimize performance in such way, that writing to PC address space at these holes might actually even cause native memory to get corrupted, BUT for now we did not try to see if that might happen.
The issue with Memory Manager in step 3-4 was, that as the DisposePtr call on the two blocks actually creates two adjacent “free” blocks, the allocation of new block using NewPtr right after that with only 16 bytes smaller size, would actually not return a physical block with smaller size. This was, because the block allocation routine checks if the space between allocated and next block would be less than minimum allowed block size (for creating new “free” block between allocation and next block), it would actually merge that small bit of space back to the physical allocation. The bug in Memory Manager was, that the when allocating block in free space, it was supposed to always merge the next “free” block after the allocation, and slice the new “free” space from that. A real Mac merges only one extra “free” block after allocation, but in M.A.C.E. for simplicity we fixed this by merging all free space in one run, thus at the same time reducing clutter of having many adjacent free blocks.
With this fix in Memory Manager, SoftPC is now finally able to boot up. Thanks to the Standard File Package implemented earlier this autumn, we could not only configure the hard disk image (C:/), but also set up a “shared” network disk (E:/) through a folder inside emulated Mac file system. This allows easy access of files (and thus DOS applications) from the M.A.C.E. file system, including some games. The shared disk access routines, however, surfaced luckily a couple File Manager bugs, related to the ioNamePtr handling in _GetCatInfo and _GetFileInfo calls, which possibly also improve compatibility of other applications too.
Below are some screenshots of the configuration dialogs of SoftPC (click for larger image):
And here is DIR command output right after booting up:
Also, there was GWBASIC included with the DOS installation, so we can run GWBASIC compatible BASIC programs:
And also some games work nicely. The Monochrome CGA emulation has interesting approach of emulating the 320×200 resolution with 1.5x scaling as 480×300 pixel bitmap display. The four CGA colors are also mapped into distinct vertical stripe patterns, which might also have been used on some old monochrome CGA displays:
Of the two above games, SOPWITH appears to be quite responsive and playable, but ALLEYCAT controls are very laggy. Also Sierra adventure games seem to run:
The Black Cauldron (pictured above) seems to work just fine, although for some reason the function keys were not working, while they did work in GWBASIC earlier (opening of doors with F6, for example). Also, none of the games produced any sound although the SoftPC boot beep works, so it might be that SoftPC may lack actual PC speaker emulation in this particular version (beyond the beep).
Other issue that we also fixed while working on this was a bug in Scrap Manager, which caused the clipboard to misbehave when working in “on-disk” mode (after _UnloadScrap was called). This allows Copy-Paste operations to work nicely in SoftPC, and it also improves clipboard functionality in other applications.
Only remaining issue with SoftPC is that some routine, possibly in SANE and most likely related to converting PC date & time, is causing divide overflow error to popup at random times, which appears to be related to the actual date & time. This needs to be investigated still at later point.
Full list of changes since last post
2019-11-27 00:34:43 +0200 • Fix a Scrap Manager bugs, fixes SoftPC copy+paste
2019-11-26 23:06:55 +0200 • Fix ioDirFlag to be 4 which appears to be correct
2019-11-26 23:06:27 +0200 • Don't crash on invalid zone in Handle validation
2019-11-26 04:01:31 +0200 • Fix register-based 68k->native UPP calls' D0 nuke
2019-11-26 03:57:20 +0200 • Don't overwrite *ioNamePtr if not indexing files
2019-11-22 03:41:15 +0200 • Add FREMS selector to SANE's FP68K dispatcher
2019-11-22 03:40:22 +0200 • Force merge of free blocks at end of BlockFindSize
2019-11-19 22:59:13 +0200 • Fix bug where everything left of a list got erased
2019-11-19 22:55:27 +0200 • Redraw modified cell in LSetCell
2019-11-19 01:42:03 +0200 • Add support 23 new native 68k exception handlers