added PAL60 specification. even though it isn't a real specification it
is more convenient and provides better user feedback
moved FrameInfo into frameinfo package, now called Current as in
frameinfo.Current
clarified storage of requested specification by the television:
how the television is probed for the specification has changed, in
particular the current spec is retreived via the GetFrameInfo()
function. in fact, this was how most other packages did it but there
also existed a GetSpecID() which was uncessary
GetReqSpecID() and GetCreationSpecID() removed, replaced with
GetResetSpecID() and IsAutoSpec()
simplified SetSpec(). removed the force argument
removed reset option for vcs.AttachCartridge()
clarified how VideoBlack and ZeroBlack are related in the 2600
ZeroBlack is now a generated and cached colour for both legacy and new
colour models, rather than an implied zero RGB value
the result of this is that VideoBlack and ZeroBlack are now affected by
colour adjustment in the same way, as it is on real hardware. this
happens because the 2600 outputs 0.0 IRE for VideoBlack and not 7.5 IRE
as you might expect. the most immediate recent change to colour
generation used a VideoBlack value of 7.5
we don't yet emulate RGB mods that do use 7.5 for VideoBlack
legacy PAL palette corrected so that the four VideoBlack values are zero
television signal split into video and audio signal. The audio signal is
only sent then a new sample from the TIA is ready
realtime mixer concept change. the mixer can be informed of a change of
TV spec. this allows the realtime mixer to make an informed judgement
about the required sample rate
the sample rate is unlikely to be ideal however unless the number of
scanlines in the TV image is the same as given in the basic TV
specification (ie. 262 lines for NTSC, 312 for PAL). because of that,
the realtime mixer can also indirectly regulate the rate of calls to
SetAudio(). the Regulate() function is called by the television which
then alters the call frequency to SetAudio() depending on the regulate
value. this effectively keeps the audio buffer nicely filled - neither
too long which would be audibly laggy, or too short which would result
in clipped audio
the values that control the regulation in both the sdlaudio package and
television package will need tweaking to find the best values
saving for an individual prefs.Disk() can be disabled/enabled. this was
added because colourgen is currently a global instance. this is fine
because all access to it is implicitely race protected. however, because
it's a global instance, testing packages will trigger it to save, which
we don't want (.gopher directories in package directories)
for the global instance of colourgen (in the specification package)
prefs saving is disabled by default
all SetPixel() function now set VBLANK pixels to 'VideoBlack' via a call
to GetColor(), rather than setting the RGBA values directly. except the
video digest, which remains a special case
this complete work from the previous commit 68263991f
calls to Logf() which do no formatting replaced with Log()
calls to Log() with Sprintf() replaced with Logf()
error types sent without use of Error(), taken advantage of new logger
package features
correct construction of wrapped errors in eeprom package
the logger.Permission interface indicates whether the environment making
the logging request is allowed to create new log entries. the
environment.Environment type satisifies the Permission interface
logger.Allow is provided as a convienient way of indicating the the log
entry should always be created
float32 pair defined as ports.EventDataPaddle
added functions to convert the float32 to and from a playback entry.
conversion from the playback entry tolerates a single float32 value
meaning that old recording files will work
rename plugging.PortLeftPlayer and plugging.PortRightPlayer to just
plugging.PortLeft and plugging.PortRight
curated package predated the standard errors package introduced in
go1.13
the standard package does a better job of what curated attempted to do
the change of package also gave me a opportunity to clean up the error
messages a little bit
playback/recorder and driven input systems moved out of the the ports
package and into a new input package. how the input systems interact has
been clarified and improved - for example, it is now posssible for a
playback file to be used to drive two emulations for comparison purposes
the debugger startup procedure has been clarified with two distinct
startup functions for playmode and debugger - each of which take
different arguments. the clarity has allowed the reintroduction of
recording and playback to the main play mode
this is now used when passing events and event data around. it also
records the port and time (in TV coordinates) which are required by
driver/passenger synchronisation and playback recording
removed television interfaces from signal package and moved the
interfaces to where they are needed
