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
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
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Removed outdated comment.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
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
Thomas Harte
ca6b54536e
Added fire and reset inputs.
2015-08-18 20:58:05 -04:00
Thomas Harte
bc805a90fe
Wired up joystick directions, at least, and fire button presses get as far as the C++. But there's some latching to figure out before they'll work.
2015-08-18 20:33:24 -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
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
1cc479affd
Removed redundant GL call.
2015-08-16 15:40:03 -04:00
Thomas Harte
391789e75c
Removed stray space.
2015-08-13 23:22:51 +01:00
Thomas Harte
cbe76ea5d5
Got rid of the thread hopping in order to redraw the GL view. Which appears to help significantly with total application cost.
2015-08-13 22:01:25 +01:00
Thomas Harte
cc98534f94
Added test for NOP, discovering the undocumented ones to be the incorrect length.
2015-08-13 07:32:50 +01:00
Thomas Harte
6616265d93
Fixed collision tests, added a few more timing tests.
2015-08-13 03:33:45 +01:00
Thomas Harte
dd0f17130a
Found and fixed some timing errors in absolute indexed and in (indirect), y addressing modes: neither is able in write or read-modify-write modes to shave a cycle as then can when reading.
2015-08-13 02:58:39 +01:00
Thomas Harte
975836c30f
Added a quick snippet test, discovering that I've cut a cycle from read/modify/writes.
2015-08-13 02:18:41 +01:00
Thomas Harte
503d684af0
Added a couple of timing tests, both of which seem to pass for now.
2015-08-13 01:55:23 +01:00
Thomas Harte
e8f70398c1
Added one basic timing test, for now: implied nop should be two cycles.
2015-08-13 01:06:56 +01:00
Thomas Harte
d19f8ed507
Removed the implicit reset upon 6502 startup, adding a reset line. Hence all tests now pass again. Added an empty shell for timing tests, the all-RAM 6502 now counting bus cycles.
2015-08-13 00:51:06 +01:00
Thomas Harte
0e52b7365e
Removed redundant code.
2015-08-10 16:42:25 +01:00
Thomas Harte
eb23a493e5
Switched back to one texel per colour clock, at least for now. Attempted to break _RGBA assumption within the cathode ray view.
2015-08-05 23:36:04 -04:00
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
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
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
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
53dd5c8f16
Trying to fix my RDY line emulation. Switched to PAL timings, at least temporarily, since it's starting to make a difference.
2015-07-31 16:44:53 -04:00
Thomas Harte
e4615cda2e
Switched back to unrealistic solid raster beams for the time being.
2015-07-30 23:01:59 -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
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
