Thomas Harte
93f7df04a0
Ensured correctly timed sampling of the interrupt line.
2016-01-10 22:55:56 -05:00
Thomas Harte
ccf20299a3
Made an attempt at getting some interrupts all up inside this thing.
2016-01-10 19:06:46 -05:00
Thomas Harte
cc5ba8243e
Fixed: turned out the power-on bit was being cleared.
2016-01-10 17:17:39 -05:00
Thomas Harte
d95414b2eb
I'm not really sure what's going wrong with paging yet but this fixes the 0xc000 byte error.
2016-01-10 12:30:24 -05:00
Thomas Harte
e07981c147
Fixed screen start address.
2016-01-09 22:52:08 -05:00
Thomas Harte
1308332a71
Hard-coded to 40 columns of black and white, here's some text, at least.
2016-01-09 22:39:46 -05:00
Thomas Harte
037602765a
This now correctly (I think) decodes information posted to the CRT. But doesn't yet post it correctly. I'm very close now, I hope.
2016-01-09 22:19:00 -05:00
Thomas Harte
07a041d788
Fixed vertical retrace sync.
2016-01-09 21:54:31 -05:00
Thomas Harte
3d6f20b7b9
Output, at last! Though sync is clearly way off.
2016-01-09 21:53:33 -05:00
Thomas Harte
09df218c01
Some output! Showing that three lines of solid sync isn't smart. But here it is.
2016-01-09 21:48:53 -05:00
Thomas Harte
b4f31edea3
Made an attempt to get RGB output mode up and running, and showing at least a box where pixels would be.
2016-01-09 21:32:56 -05:00
Thomas Harte
a900bfed65
Fixed to ensure that frame rendering wraps around, and to properly connect the Electron to its view. Now I need a working pixel shader.
2016-01-09 20:34:22 -05:00
Thomas Harte
7341f5c341
This is intended to be enough to start producing something of an output. But something's obviously still broken.
2016-01-09 20:26:40 -05:00
Thomas Harte
716bb3281b
This at least now connects up a CRT, though it never talks to it.
2016-01-07 22:26:49 -05:00
Thomas Harte
47a7654c00
Added just enough that this is probably a successful boot. I guess I'm going to need to get invested in graphics next? Hmmm.
2016-01-07 21:01:13 -05:00
Thomas Harte
8c1bfa5a05
This is the bare minimum to prove that the ROM is trying properly to boot.
2016-01-07 20:36:27 -05:00
Thomas Harte
0db8938d27
Added the option for the CSCathodeRayView to show only a subsection of the full scan area. Zoomed in a little on the 2600. Put in enough piping to give the Electron sight of its ROMs at least.
2016-01-06 23:14:36 -05:00
Thomas Harte
bfd9957c81
You now get an Electron only if you ask for a new file. That'll do for now while it's the only thing that one might want to start without supplying a file. The 6502 now starts from a defined point — being reset. The Electron is starting to grow the absolute most simple buds of its memory map.
2016-01-06 21:09:49 -05:00
Thomas Harte
c69b3256ba
Slightly simplified Swift usage.
2016-01-04 23:44:36 -05:00
Thomas Harte
616dc0b57c
Okay, so this is the absolute bare minimum about of refactoring and wiring necessary to get the [unimplemented] Electron machine pumping.
2016-01-04 23:40:43 -05:00
Thomas Harte
43ab8bbad5
Okay, so then here's a first shot at the Objective-C -> C++ bridge for the Electron.
2016-01-04 23:16:37 -05:00
Thomas Harte
ab45c1d530
Started working on a shell for the Electron emulation, including factoring out the common CRT delegate -> Objective-C bridging, serial dispatch queue and frameskipping logic from the Atari 2600 shell.
2016-01-04 23:12:47 -05:00
Thomas Harte
22fa024546
Added document XIB.
2016-01-03 20:46:39 -05:00
Thomas Harte
aa0714fe27
Started sketching out an Acorn Electron emulation, as it's a platform I'm familiar with and will force me to figure out PAL decoding. Factored out NTSC-specific parts of the display decoding logic and hence added RGB output mode.
2016-01-03 20:41:43 -05:00
Thomas Harte
96503a3ac5
Switched to nicer nullable/nonnull syntax.
2016-01-02 17:59:21 -05:00
Thomas Harte
feeedbe33b
The standard Xcode versioning updates. Nothing of substance.
2016-01-02 17:57:23 -05:00
Thomas Harte
675070c5dd
Very, _very_ minor: switched to normal C++ constructor syntax for simple variable initialisation.
2015-12-06 16:53:37 -05:00
Thomas Harte
5feef2110f
Added a very basic attempt at shadow mask emulation.
2015-09-24 21:23:16 -04:00
Thomas Harte
63b648be65
Switched down to four samples per pixel, just more than half as many, to fit into a vec4. Edges aren't as smooth but I'm wondering whether it'll make much odds when I implement a shadow mask.
2015-09-17 19:25:15 -04:00
Thomas Harte
5d6bee4927
Of course, being in-phase means being the cosine wave.
2015-09-10 21:30:39 -04:00
Thomas Harte
82aa6d074a
'type' is out, at least for the time being.
2015-09-05 20:25:30 -04:00
Thomas Harte
6a0b4e86c8
An Xcode beta version bump, nothing more.
2015-09-05 17:21:36 -04:00
Thomas Harte
53e699516b
Disabled multisampling unless and until I can get the per-pixel cost down.
2015-09-05 17:21:16 -04:00
Thomas Harte
7fb6c86d9d
Okay, it looks like colour 3 is approximately phase offset 0, and the palette wraps around after 14 entries, not 16. Also got a bit less dependent on floating point accuracy for the step.
2015-09-05 17:10:41 -04:00
Thomas Harte
39027b675d
Fixed YIQ conversion and made sampling pattern slightly more rational.
2015-09-05 17:09:24 -04:00
Thomas Harte
80cf3d9301
Formally gave the 2600 responsibility for providing the code that decodes one of the things it has put into a buffer into a composite sample.
2015-09-03 12:28:16 -04:00
Thomas Harte
ac8fc9a1a0
Experimenting with pre-encoding luminance and chrominance separation over on the
...
CPU as otherwise the GPU does them repetitively and more awkwardly (as it's working purely in floats). It means uploading twice as much data though, so I don't
know. Still only half as much as the RGBA path of a few days ago. Will experiment.
Also slightly adjusted division of responsibility in the fragment shader per the
desire to have the `sample` function owned externally.
2015-09-03 11:15:23 -04:00
Thomas Harte
11acf3f2d3
Made some further minor attempted improvements.
2015-09-02 20:51:56 -04:00
Thomas Harte
161450942a
Removed outdated comment. This is better now than it was.
2015-09-02 17:20:23 -04:00
Thomas Harte
0d6094d842
Attempted very basic vectorisation, plus some minor other clean-ups.
2015-09-02 17:17:22 -04:00
Thomas Harte
f60ba4f487
Added a note about horribleness to the source. You never know who's looking.
2015-09-01 22:38:15 -04:00
Thomas Harte
cb6e6e8acb
It's the worst fragment shader you'll ever see. The worst. But this attempts NTSC composite video emulation, artefacts included.
2015-09-01 22:36:45 -04:00
Thomas Harte
5fe0cff692
Fine. I'll accept 'bin' files if I must.
2015-08-19 21:36:50 -04:00
Thomas Harte
043d2f9896
It sounds like the two sync signals are exclusive ORd.
2015-08-19 21:36:33 -04:00
Thomas Harte
3c3c4d2f7c
Enlarged drawing range a little.
2015-08-19 21:35:26 -04:00
Thomas Harte
c5e480cfae
Threw in missile repeats.
2015-08-19 09:46:57 -04:00
Thomas Harte
28fad66272
Okay, so I had those constants transposed. What a klutz I've been!
2015-08-19 09:09:00 -04:00
Thomas Harte
f74d9ee373
Copied in quote. So that I can stop looking it up.
2015-08-18 22:36:32 -04:00
Thomas Harte
a62c7f5c56
At last! Discovered CRT scanning bug; was always moving by the full proposed run length along the scan, not the time until the next event. Using this, have implemented proper vertical sync at last (I think). Have disabled scanline banding too, as now everything meets up it's more helpful to be able to see with clarity.
2015-08-18 22:22:47 -04:00
Thomas Harte
462a791ed3
Ensured that no backlog accumulates of cycles to run. Otherwise the background queue was lagging behind.
2015-08-18 21:13:54 -04:00
