Thomas Harte
|
67dffc89e0
|
Stripped unnecessary includes.
|
2016-03-13 13:25:34 -04:00 |
|
Thomas Harte
|
7255408313
|
Experimented with going back to horizontal sync on leading edge; not sure so (temporarily?) disabled.
|
2016-03-08 22:54:05 -05:00 |
|
Thomas Harte
|
68da673a95
|
Wrapped this up as explicitly only the Mac thing to do.
|
2016-03-08 22:53:29 -05:00 |
|
Thomas Harte
|
bf5747f83e
|
Made an attempt to chop out all the stuff of building up the OpenGL data from the stuff of parsing input.
|
2016-03-08 22:40:23 -05:00 |
|
Thomas Harte
|
14b2927275
|
Made further attempts to tidy up; trying to demarcate between public interface and private.
|
2016-03-08 20:59:16 -05:00 |
|
Thomas Harte
|
c7976dd657
|
Started trying to clean up my Outputs namespace by moving stuff related to the CRT underneath a separate subnamespace.
|
2016-03-08 20:49:07 -05:00 |
|
Thomas Harte
|
bb09a5f58c
|
The attribute locations don't really need to be stored. They can be transient.
|
2016-03-07 21:42:21 -05:00 |
|
Thomas Harte
|
6dfe877c43
|
Basic attempts to organise myself into shape for composite output continue.
|
2016-03-07 21:22:47 -05:00 |
|
Thomas Harte
|
1e5fe2b2c1
|
Made an attempt to reestablish the Atari 2600 output connection despite various changes (TODO: generalise that stuff), and to start creating the composite shader.
|
2016-03-07 21:04:04 -05:00 |
|
Thomas Harte
|
2de229152f
|
Started sketching out shaders to do the first part of the composite conversion.
|
2016-03-07 19:21:04 -05:00 |
|
Thomas Harte
|
cd9c62acca
|
Still stepping slowly towards a working composite mode, switched the RGB sampling function to returning a vec4, which may be of benefit to any machine with a brightness part of an RGB signal, and started edging towards at least having the correct GLSL programs ready for converting composite output.
|
2016-03-07 19:08:26 -05:00 |
|
Thomas Harte
|
3b6c9c15a1
|
Switching momentarily back to monitor mode, resolved why I was suddenly getting no output upon creating some texture targets.
|
2016-03-07 18:55:15 -05:00 |
|
Thomas Harte
|
eefd17ed4c
|
Fixed sync response in composite scan output generation and stored texture coordinates.
|
2016-03-05 21:52:22 -05:00 |
|
Thomas Harte
|
6cddb4c9c8
|
Added a first attempt to generate output scans for composite mode. So this in theory completes the CPU side of composite operations. Though I'm sure problems will reveal themselves.
|
2016-03-05 21:18:28 -05:00 |
|
Thomas Harte
|
3f39803d32
|
Switched to triangle strips, to eliminate the need for any temporary storage for the composite output path.
|
2016-03-05 20:47:11 -05:00 |
|
Thomas Harte
|
23c223e2ed
|
Started edging towards completing the CPU side of accumulating enough data for composite decoding.
|
2016-03-05 17:55:18 -05:00 |
|
Thomas Harte
|
5c8db71c64
|
Corrected some constants, ensured both machines (so far) are setting the output device.
|
2016-03-05 16:19:10 -05:00 |
|
Thomas Harte
|
70b6d51451
|
Ever more baby steps back towards composite decoding.
|
2016-03-05 14:36:12 -05:00 |
|
Thomas Harte
|
2f7626a5e0
|
Okay, this definitely definitely is supposed to be this way around.
|
2016-02-28 22:00:05 -05:00 |
|
Thomas Harte
|
3449120c24
|
Added a note to future self, put the scan edge generator back to the way round it was before.
|
2016-02-27 22:51:37 -05:00 |
|
Thomas Harte
|
7839d93344
|
With the provision of an extra hint to the CRT and, finally, the realisation about why my scans weren't exactly joining up, improved output precision.
|
2016-02-27 22:39:01 -05:00 |
|
Thomas Harte
|
1c6de7692d
|
Made an attempt to fix tape output interrupts; offloaded raster width and placing conversion to the GPU.
|
2016-02-27 20:37:41 -05:00 |
|
Thomas Harte
|
db18c85423
|
Simplified the run builder rather; put a double check of Electron timing in place.
|
2016-02-25 22:01:42 -05:00 |
|
Thomas Harte
|
1eea28b692
|
Disabled some debugging parts, added some others, marked some things as inline. Ticking over.
|
2016-02-22 23:35:42 -05:00 |
|
Thomas Harte
|
4b28e7b974
|
Switched back to a single array and vertex buffer.
|
2016-02-21 22:54:55 -05:00 |
|
Thomas Harte
|
574985f9a2
|
Fixed interlaced timing; switched to a more robust detector for horizontal sync; eliminated some test logging.
|
2016-02-20 20:29:40 -05:00 |
|
Thomas Harte
|
00f414d757
|
Made an attempt to reintroduce interlacing and screen modes with gaps. Something's wrong with synchronisation though, so most likely I'm outputting a bad signal.
|
2016-02-20 17:32:51 -05:00 |
|
Thomas Harte
|
68992a62f9
|
Switched to a subtler to out-of-band syncs.
|
2016-02-20 00:16:07 -05:00 |
|
Thomas Harte
|
1954f7bcbd
|
Got back to a stable image, at least when staying in a mode. Which is what I was trying to fix. Hmmm.
|
2016-02-19 23:41:09 -05:00 |
|
Thomas Harte
|
570d88a876
|
Added a simple metric for measuring surprise. Which will hopefully allow me to reimplement PAL/NTSC auto-selection for the Atari 2600.
|
2016-02-18 23:22:06 -05:00 |
|
Thomas Harte
|
ce3c098c28
|
Widened beam a little, moved to a linear approximation of age across scans, cut number of stored frames.
|
2016-02-16 21:48:09 -05:00 |
|
Thomas Harte
|
b261e86c62
|
Reintroduced lateral as a parameter in CRT drawing, to simulate a rounded raster.
|
2016-02-16 20:37:04 -05:00 |
|
Thomas Harte
|
a01f90ff3e
|
Attempted a switch to the real PAL visible area and to something a bit like a real phosphor decay.
|
2016-02-14 21:57:23 -05:00 |
|
Thomas Harte
|
7580d192d5
|
Fixes: now setting correct frame time estimate, properly enabling the timestamp attribute, and ensuring that the Electron flushes screen work at least once per host frame update.
|
2016-02-14 19:28:02 -05:00 |
|
Thomas Harte
|
752db78431
|
No doubt still imperfect but killed the repeated whole texture uploads.
|
2016-02-13 23:55:02 -05:00 |
|
Thomas Harte
|
697e50c0cc
|
Screen output is back, no matter how inefficiently.
|
2016-02-13 23:50:18 -05:00 |
|
Thomas Harte
|
d0b2d840da
|
A minor fix to data queuing. Display still absent.
|
2016-02-13 20:57:41 -05:00 |
|
Thomas Harte
|
eeb0e134fd
|
Started the transition towards a more natural collection of rolling buffers, with phosphor decay in mind.
|
2016-02-13 20:52:23 -05:00 |
|
Thomas Harte
|
fd2d5c78f8
|
Started trying to nudge towards the multistage approach to video decoding.
|
2016-02-12 22:31:05 -05:00 |
|
Thomas Harte
|
0a09762be6
|
Fixed output precision compared to the new approach of trusting the flywheel for position, and eliminated fixed-Acorn constants. Also re-enabled the faded previous frame, at least temporarily.
|
2016-02-12 19:53:49 -05:00 |
|
Thomas Harte
|
1d20a29d97
|
Made an attempt to switch to the flywheels for both vertical and horizontal sync, and to act more appropriately for out-of-bounds sync requests. Lots of tweaking to do, I fear.
|
2016-02-11 23:43:08 -05:00 |
|
Thomas Harte
|
c81891ec43
|
Minor tidying and at least acknowledged the new flywheel encapsulation.
|
2016-02-11 22:13:38 -05:00 |
|
Thomas Harte
|
a6574d1f96
|
Made an attempt to factor out and more clearly to document my implementation of flywheel synchronisation.
|
2016-02-11 22:12:12 -05:00 |
|
Thomas Harte
|
c66409421e
|
Switched to generating an interlaced output, that apparently being correct. Enabled a poor man's version of phosphor persistence to smooth things out a little. It's not completely unconvincing.
|
2016-02-10 23:11:25 -05:00 |
|
Thomas Harte
|
b5bcadb8d3
|
Reinstated clipped CRT output, with more appropriate ownership of the decision.
|
2016-02-07 22:18:55 -05:00 |
|
Thomas Harte
|
3a689d14cc
|
Added padding of supplied data to correct for any potential rounding errors when rendering.
|
2016-02-07 20:29:32 -05:00 |
|
Thomas Harte
|
3a9ea66f8b
|
Filled in shader class.
|
2016-02-07 19:21:22 -05:00 |
|
Thomas Harte
|
4d0a218a57
|
Certainly at least seriously considering a separate holder for the "compile a shader" logic. Otherwise taking steps back towards PAL/NTSC decoding.
|
2016-02-07 17:32:38 -05:00 |
|
Thomas Harte
|
602327cd9d
|
Sketched out a quick class for rendering to texture.
|
2016-02-07 15:42:02 -05:00 |
|
thomasharte
|
2cb12a7513
|
Allowed overly aggressive allocations to be cleared up after the fact.
|
2016-02-06 16:07:23 -05:00 |
|
Thomas Harte
|
bf348ccb96
|
Fixed clearing logic.
|
2016-02-05 22:47:12 -05:00 |
|
Thomas Harte
|
6ab425deda
|
There is now a semi-reasonable amount of screen output again.
|
2016-02-05 21:35:39 -05:00 |
|
Thomas Harte
|
80e7e5e602
|
Updated to return old behaviour of drawing only upon changes.
|
2016-02-04 23:05:47 -05:00 |
|
Thomas Harte
|
8bc3f8046d
|
This endeavours to move everything into the CRT class except the final version of shader building.
|
2016-02-04 22:57:46 -05:00 |
|
Thomas Harte
|
e0d51408e4
|
Onward with carrying this through to the bitter end, this at least results in all the appropriate knowledge and call-ins occuring at the CRT.
|
2016-02-04 22:28:50 -05:00 |
|
Thomas Harte
|
09e11469c3
|
Simplified further: eliminated delegate. Which means I can go frame-free internally to the CRT at some point, if I want.
|
2016-02-03 19:11:18 -05:00 |
|
Thomas Harte
|
19393390ac
|
It's broken now, but this is what I now intend the full public interface of the CRT to be.
|
2016-02-02 22:41:33 -05:00 |
|
Thomas Harte
|
4554abb755
|
Made an attempt to be more rigorous in display generation on the Electron, to make sure I deal with mid-line changes to/from blank line mode. Even if it turns out that they generate pixels.
|
2016-01-29 21:14:13 -05:00 |
|
Thomas Harte
|
adc6838ba0
|
Continued slow migration of shader ownership to CRT. Attempted to start debugging the tape interface.
|
2016-01-27 21:35:57 -05:00 |
|
Thomas Harte
|
1819e7b9cc
|
Started sketching out an appropriate interface to transfer responsibility for shaders to the CRT.
|
2016-01-23 19:06:32 -05:00 |
|
Thomas Harte
|
ace331d4b4
|
Got a bit higher level in CRT timing specification. Which internally allows it now to infer the colour clock frequency. Which will be helpful momentarily.
|
2016-01-23 18:53:20 -05:00 |
|
Thomas Harte
|
a9e26d7808
|
Introduced a scan's delay, as intended.
|
2016-01-23 17:49:25 -05:00 |
|
Thomas Harte
|
20cab08f8f
|
Added a two-slot buffer of scans and a comon dispatch mechanism.
|
2016-01-23 17:44:34 -05:00 |
|
Thomas Harte
|
0efe4b312c
|
Disabled my various bits of rate interchange debugging; improved test for when to call update_display due to a RAM write.
|
2016-01-21 22:16:52 -05:00 |
|
Thomas Harte
|
48ddd3c497
|
Set about documenting the CRT; while doing so decided to add an optional clock divider for input; having done so decided to try to exploit it with the Electron.
|
2016-01-21 21:17:47 -05:00 |
|
Thomas Harte
|
4c16d34063
|
Moved set_tape so that the inline definition of get_next_tape_pulse is visible to it. Also eliminated some dead typedefs.
|
2016-01-20 08:27:25 -05:00 |
|
Thomas Harte
|
f727582911
|
Started making first moves towards stripping CSCathodeRayView of its responsibilities. If that can be merely an OpenGL view that presents things, things will be a lot more portable.
|
2016-01-20 08:21:33 -05:00 |
|
Thomas Harte
|
e65cd4cf06
|
Some data is marginally reaching the CPU from the tape.
|
2016-01-19 22:05:34 -05:00 |
|
Thomas Harte
|
ddcc34740b
|
Added lots of debugging output while I attempt to locate the source of audio scratchiness, also simplified manner of dealing with wraparound within the AudioQueue wrapper.
|
2016-01-18 13:50:19 -06:00 |
|
Thomas Harte
|
b58e59e2bb
|
Fixed: now outputting the requested output rate, rather than massively overproducing at the input rate.
|
2016-01-14 23:12:40 -05:00 |
|
Thomas Harte
|
383b2be4c6
|
Fixed one off-by-one error.
|
2016-01-14 21:33:27 -05:00 |
|
Thomas Harte
|
8bd04a6be4
|
Switched model for filter subclasses. Implemented test square[-ish] wave to check for obvious stream errors. None is clear.
|
2016-01-14 21:27:02 -05:00 |
|
Thomas Harte
|
38ffcaa262
|
Here, at last, is _some_ audio output, at least.
|
2016-01-14 20:33:22 -05:00 |
|
Thomas Harte
|
afde8dac49
|
Closed the loop such that audio manages to bubble up into Objective-C.
|
2016-01-13 22:38:59 -05:00 |
|
Thomas Harte
|
439d452e23
|
Resolved some errors.
|
2016-01-13 22:11:33 -05:00 |
|
Thomas Harte
|
49e89a4bcb
|
I'm not yet completely convinced by my approach to time basing, but it'll probably do? If so then this more or less gets me ready for a point-sampled filtering.
|
2016-01-13 22:02:39 -05:00 |
|
Thomas Harte
|
d9a7ef9e46
|
Edging towards audio output; the speaker is given appropriate input and output rates, and then updated with current divider and enabled/disabled status.
|
2016-01-13 21:03:43 -05:00 |
|
Thomas Harte
|
84ba4e2900
|
Tidied a little, started working towards supporting speaker output.
|
2016-01-12 22:19:56 -05:00 |
|
Thomas Harte
|
3437781abd
|
Started sketching out an interface for sound generation. Which made me realise that the CRT in CRTDelegate was redundant, since C++ has namespaces.
|
2016-01-12 16:54:09 -05:00 |
|
Thomas Harte
|
82aa6d074a
|
'type' is out, at least for the time being.
|
2015-09-05 20:25:30 -04:00 |
|
Thomas Harte
|
3c3c4d2f7c
|
Enlarged drawing range a little.
|
2015-08-19 21:35:26 -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
|
88d5064737
|
Not that it makes a lot of difference, there being no names to mangle, but moved the closing #ifdef __cplusplus to the idiomatic place.
|
2015-08-18 20:33:59 -04:00 |
|
Thomas Harte
|
902795d61c
|
Switched vertical sync detection method, at least for now. They never happen automatically (I need to fix that) and just always take effect if detected in the lower half of the display. PAL/NTSC is determined just by looking at the refresh rate.
|
2015-08-18 00:17:03 -04:00 |
|
Thomas Harte
|
083b678785
|
Quickie: observed that the initial position is one scanline dirty, not zero. Also switched to a size_t on the write pointer, size_t being the correct C size for into-memory offsets.
|
2015-08-17 00:25:32 -04:00 |
|
Thomas Harte
|
cde9bb7ebc
|
Put common shift step into a macro.
|
2015-08-16 16:12:20 -04:00 |
|
Thomas Harte
|
a693c081f8
|
Switched on the appropriate compiler warnings re: signed comparisons and implicit conversions. Fixed all less-than-explicit calls.
|
2015-08-16 16:08:29 -04:00 |
|
Thomas Harte
|
b440fed323
|
Fixed a couple of incorrect references to horizontal constants or calculations where the intention is to use vertical.
|
2015-08-13 18:29:07 +01:00 |
|
Thomas Harte
|
59c872ada6
|
Attempted to reintroduce suitably noted emergency flyback. To re-enable auto-selection of PAL.
|
2015-08-13 14:55:53 +01:00 |
|
Thomas Harte
|
aebf636528
|
Ensured the PIA timer resumes its normal tick rate after being read; fixed those spaces that had crept in where tabs should be.
|
2015-08-10 16:55:16 +01:00 |
|
Thomas Harte
|
fd36f13baf
|
The cathode ray view no longer hard codes the frame size. So that's one less coupling. Doubled pixel output size to give sufficient sampling detail to capture the NTSC colour clock (ummm, hopefully).
|
2015-08-05 21:45:47 -04:00 |
|
Thomas Harte
|
67e82c713f
|
Broke assumption that every item in a vertex description is a short, specifically turning lateral into a byte. Which buys me a byte for phase, if that's sufficient.
|
2015-08-05 21:12:33 -04:00 |
|
Thomas Harte
|
5644b3a1cc
|
Fixed scanline sizing and fill issues, as well as shortening vsync to the correct Atari length.
|
2015-08-05 20:55:27 -04:00 |
|
Thomas Harte
|
265d1d5b24
|
Merge branch 'EdgeTriggeredVSync'
|
2015-08-05 20:30:02 -04:00 |
|
Thomas Harte
|
84d1c2e47d
|
Fixed end of sync time calculation and ensured the pretend capacitor is emptied by the decision to retrace and doesn't refill during retrace.
|
2015-08-05 20:29:20 -04:00 |
|
Thomas Harte
|
04c2640b15
|
Made a quick attempt to allow vsync triggers only on the raising edge of a sync signal. Will need to investigate more thoroughly.
|
2015-08-03 08:42:05 -04:00 |
|
Thomas Harte
|
5313b48ebd
|
I'm ashamed to admit, I: played with numbers until enough things looked stable such that I can investigate other things. Discovery: my PAL autodetection was way off. Fixed, hopefully.
|
2015-08-02 20:32:18 -04:00 |
|
Thomas Harte
|
55017b78a5
|
Made an attempt to unify my variable storage (and, technically, to get beam size correct across the frame).
|
2015-08-02 19:30:45 -04:00 |
|
Thomas Harte
|
6e52e5df1c
|
Full separate 'lateral' usage is go. Also probably at some point I need to throw in a phase property, which this new flexibility will help with.
|
2015-08-02 14:32:29 -04:00 |
|
Thomas Harte
|
3ab6585789
|
Started making the format of data included in a CRTFrame less a matter of variously hard-coded magic constants. Which will allow me to separate the idea of an internal lateral position from the direct texture coordinate, avoiding precision sampling errors at the top and bottom.
|
2015-08-02 14:25:21 -04:00 |
|
Thomas Harte
|
be421587ad
|
Eliminated the vertical retrace counter; vertical retrace ends when the beam gets back to the top.
|
2015-08-02 13:48:35 -04:00 |
|
Thomas Harte
|
de4f2bf5dd
|
Maybe the 10 lines resource I saw meant 10 lines including charge time?
|
2015-07-31 19:00:40 -04:00 |
|
Thomas Harte
|
5f1d76e855
|
Can't seem to find any documentation: assumed horizontal sync is generated during vertical.
|
2015-07-31 18:49:02 -04:00 |
|
Thomas Harte
|
c1a12ad4df
|
Fix to make sure end of vertical sync is always correctly spotted as an event, rather than just happening off the books. So I can now watch Joust roll to its heart's content.
|
2015-07-31 18:15:59 -04:00 |
|
Thomas Harte
|
9c91f1a2eb
|
Added an attempt at NTSC/PAL autodetection, based on number of missed vertical syncs.
|
2015-07-31 18:04:33 -04:00 |
|
Thomas Harte
|
a5d66e9dd6
|
Factored out a few more constants, started trying to ensure there's enough slack and the mechanisms in place for the CathodeRayView to hold onto two frames if it desires, for potential phosphor simulation, switched once again to additive blending — much more like a real CRT — and added a sine function across the width of spans per my understanding of how an electron gun actually fires.
Why do all this when overall timing is still so far off? It helps me more easily see how overall timing is so far off.
|
2015-07-31 17:47:10 -04:00 |
|
Thomas Harte
|
6ad3fbbaf2
|
Slowed flywheel adjustments a little, the better to highlight phase errors for the time being.
|
2015-07-30 23:00:54 -04:00 |
|
Thomas Harte
|
cfe758daa0
|
A tweak here, a tweak there, to help with debugging.
|
2015-07-30 21:29:40 -04:00 |
|
Thomas Harte
|
20c2d98b9a
|
Converted remaining spaces to real tabs.
|
2015-07-30 20:51:32 -04:00 |
|
Thomas Harte
|
1fa7a77793
|
Continuing in my attempts to figure out the complete absence of graphics from some games: there are 262 lines on an NTSC screen, not 256. Also ensured that the CRT has a little spare range at the edges so that its generated triangles don't wrap around just because of integer overflow.
|
2015-07-30 20:07:20 -04:00 |
|
Thomas Harte
|
98efae2536
|
Reintroduced emergency vertical sync — so that output occurs even when the emulation isn't catching syncs properly — and switched some spaces to tabs.
|
2015-07-30 17:16:49 -04:00 |
|
Thomas Harte
|
596d34190c
|
Fixed: write pointer is calculated only after write x and y are known. This is probably the memory handling problem?
|
2015-07-28 08:15:54 -04:00 |
|
Thomas Harte
|
1f229ee6f7
|
More tweaks to provide a stable image, at least for the time being.
|
2015-07-27 20:18:25 -04:00 |
|
Thomas Harte
|
01109d441b
|
Made an attempt at NTSC colours. Hard coded in RGB, not composite. Short cuts, tsk.
|
2015-07-27 19:04:03 -04:00 |
|
Thomas Harte
|
31e9a53a44
|
Removed some debugging code.
|
2015-07-27 16:43:51 -04:00 |
|
Thomas Harte
|
caffe56a2d
|
Slightly expanded width of cathode ray gun, decided to figure out exactly how to deal with off-by-one lengths and precision at a later date, ensured that failure to catch vertical sync doesn't cause out-of-bounds buffer access on the hard-coded, assumed large enough, 512x512 data textures.
|
2015-07-27 00:28:47 -04:00 |
|
Thomas Harte
|
65bb31d55b
|
With around about a thousand issues, not the least of which being sometimes unsafe memory accesses, I've at last got pixels on screen.
|
2015-07-26 23:50:43 -04:00 |
|
Thomas Harte
|
e53fbcf9ea
|
Reshuffled to make the OpenGL view explicitly a conduit for CRT-style output, and to give it responsibility for frame drawing. Which is still an awkward thread hop for the time being, but I've yet to read up on the advocated approach to multithreading with an NSOpenGLView; it looked like special provisions were available.
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2015-07-26 15:13:46 -04:00 |
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Thomas Harte
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dd428c5d4d
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Slightly relaxed time it takes to recognise vertical sync; considered what to do about reviving proper vertical sync but then gave up.
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2015-07-24 23:56:25 -04:00 |
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Thomas Harte
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cea2580000
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Upped internal precision a little.
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2015-07-24 23:36:44 -04:00 |
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Thomas Harte
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ecb2898bd5
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The overall architecture of who has responsibility for what is now very askew but: the CRT now outputs a tightly packed short buffer, with the probable OpenGL destination in mind. So it's now all fixed arithmetic internally. CRTFrame is reduced to a plain C struct with the intention that the OpenGL view will take responsibility for it and stop doing the back-and-forth sprint on getting buffer data. The Atari 2600 now outputs explicit blanks rather than level blacks for its border, so that it's easier visually to debug the CRT in its form as far as it has currently progressed: to drawing lines where the cathode ray gun would run while outputting pixel. I note that I'm still not quite getting vertical sync right yet — I'm just accepting it anywhere in teh frame — but that should be an easy fix.
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2015-07-24 23:29:45 -04:00 |
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Thomas Harte
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d72287a776
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Looked up normal retrace time (it's a lot less than 16µs and 26 scanlines — more like 7 and 10) and that the visible portion of a line is defined to start about 12 µs after the start of hsync, put the first two numbers into my CRT to make that more accurate, then derived a newer guess about what the Atari 2600 does for each of its 228 cycles. The text version of a frame is now looking pretty good. So it's probably time to hit OpenGL and the OS X side of things. Though I'll have a quick look to find out whether I can learn the exact real Atari 2600 timings before moving on.
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2015-07-23 19:24:25 -04:00 |
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Thomas Harte
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33c06baffa
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Explicitly separated vertical and horizontal sync event tracking, so as explicitly to be able to handle a coincidental simultaneous occurrence of both. Also for clarity.
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2015-07-23 18:53:18 -04:00 |
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Thomas Harte
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5203f31bf4
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Reintroduced a console examination of the output runs being received after fixing a failure to complete or restart frames over in the CRT; weirdly it seems that sync is being obeyed but raster position is off. So work to do.
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2015-07-22 20:45:10 -04:00 |
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Thomas Harte
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065050115f
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Made an attempt to switch to a triple-buffering scheme for CRT outputs, with an eye towards asynchronicity.
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2015-07-22 20:33:20 -04:00 |
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Thomas Harte
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b503e13380
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Fix one: vertical scan speed was failing to allow for the number of cycles in a line.
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2015-07-22 18:56:35 -04:00 |
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Thomas Harte
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963cb2f6fb
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Attempted to switch to slightly more meaningful names within the CRT and implemented a delegate to investigate output. Working on it.
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2015-07-22 18:15:18 -04:00 |
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Thomas Harte
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908c171d2d
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Commented the heck out of this thing, to put my thoughts in order if nothing else.
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2015-07-21 16:37:39 -04:00 |
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Thomas Harte
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a1a1b15d18
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Made a quick attempt to accumulate a list of detected output runs. Which means finally having to specify normal frame height. I'm already at too many magic formulae though, so this will need proper revision when I'm next awake. Definitely my horizontal position advancement is way off.
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2015-07-20 23:18:56 -04:00 |
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Thomas Harte
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4fa315ab4d
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This looks a lot closer to correct. The loss of horizontal sync during vertical sync is odd but the two should be fully decoupled in here. I'll have to check. Probably I've got something wrong. There are approximate sinusoidals when re-establishing sync, so that's promising as to the flywheel.
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2015-07-20 21:58:32 -04:00 |
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Thomas Harte
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4695295dd1
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Made complete attempt at sync discrimination. But I seem somehow to be locking such that horizontal sync is in the middle of the line. Obviously my flywheel is at fault somehow.
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2015-07-20 21:43:00 -04:00 |
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Thomas Harte
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4e4c082a05
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Made some minor attempt at proper sync response. I think I've gone way off piste and overcomplicated it.
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2015-07-19 23:43:22 -04:00 |
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Thomas Harte
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4a1e9fe2a8
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Rephrased the CRT as owning an arbitrary number of buffers and vending storage space for pixel output. That much better maps to potential implementations of this thing in GLSL, with ES 2.0's limitations kept in mind.
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2015-07-19 21:21:34 -04:00 |
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Thomas Harte
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7df5025eef
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Started sketching out the delegate interface that will allow a branch from the CRT into whatever native display system is used by a particular platform.
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2015-07-19 18:32:42 -04:00 |
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Thomas Harte
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6f78ecdc9c
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Made first genuine attempt at outputting a meaningful CRT stream. Which shows some significant errors. So work to do.
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2015-07-19 16:48:14 -04:00 |
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Thomas Harte
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2d0f861474
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Incoming: a 'CRT' class, to receive information intended for a cathode ray tube. To decode sync, etc.
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2015-07-19 13:36:27 -04:00 |
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