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Author SHA1 Message Date
Thomas Harte
416c944f02 Experimental: let's try accumulating history directly in the framebuffer. 2016-04-26 21:41:39 -04:00
Thomas Harte
3af97d4069 Eliminated redundant variable. 2016-04-26 19:57:05 -04:00
Thomas Harte
345348aeb7 Merge branch 'master' of github.com:TomHarte/CLK 2016-04-25 22:41:15 -04:00
Thomas Harte
6c567d166a Fixed colour burst acceptance, switched to an integral single byte streaming of Atari colours. 2016-04-25 20:56:15 -04:00
Thomas Harte
973a53744b Switched from asterisks for footnote marks, per Markdown requirements. 2016-04-25 13:09:35 -04:00
Thomas Harte
3341e3550b Filled in some detail on the TV emulation. 2016-04-25 13:08:22 -04:00
Thomas Harte
51c1562eee Update README.md 
Provided further exposition
 2016-04-25 10:19:51 -04:00
Thomas Harte
6d769b3639 Merge pull request #1 from TomHarte/Electron 
Adds Acorn Electron emulation, significantly improving the CRT and timing in general and adding sound output for the general-use code.
 2016-04-24 22:33:20 -04:00
Thomas Harte
9b64f64db7 Attempted to normalise some style decisions.` 2016-04-24 22:32:24 -04:00
Thomas Harte
7a8d100861 Found a new working formula for NTSC Atari 2600 colours. 2016-04-24 22:02:00 -04:00
Thomas Harte
884755c560 Ensured the GL context is available when switching Atari 2600 output, and that it locks the output. 2016-04-24 20:56:21 -04:00
Thomas Harte
2bd6566768 Oh, of course, I can use GL_CONSTANT_ALPHA so that new colours can be painted at alpha 1.0 while possibly saturating with old colours. 2016-04-24 20:47:24 -04:00
Thomas Harte
d221c712b0 Ensured GL context is active when destructing CRTOpenGL. 2016-04-24 20:34:25 -04:00
Thomas Harte
acab22d95a Removed any improper talk of YUV. Switched to (cos, -sin) formulation of the quadrature vector, which I now believe to be correct. 2016-04-24 20:27:03 -04:00
Thomas Harte
d393776677 Fixed an incorrect sign. 2016-04-24 19:29:30 -04:00
Thomas Harte
db908a7547 Adjusted Atari to using its non-standard line lengths. 2016-04-24 19:23:30 -04:00
Thomas Harte
9b2b7a09eb Ensured that colour space changes take effect. 2016-04-24 19:16:23 -04:00
Thomas Harte
929cfc49cb Extended window for picking output frequency, attempted to consolidate CRT OpenGL timing uniforms for approprate resetting. 2016-04-24 18:58:31 -04:00
Thomas Harte
082003ed0a Reintroduced the CRT delegate and the 2600's automatic region switching. Albeit that the CRT itself doesn't adjust properly to new timings yet. 2016-04-24 18:36:22 -04:00
Thomas Harte
9260d97b03 Oh, of course, it's that the output vertex array doesn't get initialised unless there's an RGB shader program. Silly oversight. Fixed. And switched back to TV output for correct colours. 2016-04-24 17:56:36 -04:00
Thomas Harte
d0f9a6c2f5 Added a dump-the-input default RGB output shader. Which at least proves that the Atari 2600 is generally still working. 2016-04-24 17:35:25 -04:00
Thomas Harte
775fc270e6 Fixed bug whereby first frame drawn has random collection of data. 2016-04-24 07:00:22 -04:00
Thomas Harte
80a3169674 Started reviving the Atari 2600 emulation. Put new startup sequence into place. 2016-04-24 06:56:08 -04:00
Thomas Harte
bdaf4cee43 Switched to an in-framebuffer approach to phosphor decay, which might be acceptable now that every single pixel is being painted, re-emphasises luminance and stretched sampling period for the two FIR filters as well as decreasing the amount of signal that is retained, subjectively to improve output. 2016-04-24 06:16:41 -04:00
Thomas Harte
c123f3bf74 Fixed run extension, temporarily forced colour amplitude. 2016-04-23 14:16:49 -04:00
Thomas Harte
a4889074b8 Moved final colour space conversion out of the innermost loop. 2016-04-22 21:29:27 -04:00
Thomas Harte
8ff1f82008 Fixed accidental channel duplication. 2016-04-22 19:18:28 -04:00
Thomas Harte
95639f1189 Made attempt to introduce final filtering stage and output. 2016-04-22 19:15:59 -04:00
Thomas Harte
23311d633b Doubled phosphor life, added comment on required final stage fix for tomorrow. 2016-04-21 23:15:48 -04:00
Thomas Harte
59c07f7ddd This, at least, is an attempt to decode chrominance, as yet unfiltered, and not commuted to RGB (and possibly packed incorrectly). 2016-04-21 23:01:54 -04:00
Thomas Harte
cc7bf97a9c This now attempts to filter y. 2016-04-21 22:32:30 -04:00
Thomas Harte
e7ed1224a5 Introduced the second filtering stage, albeit that it presently does nothing whatsoever. 2016-04-21 21:32:36 -04:00
Thomas Harte
ae2760e034 Colour phase is now updated and varies per line. 2016-04-21 21:07:29 -04:00
Thomas Harte
23ce032ba1 Started edging towards the necessary flexibility for the other two intermediate shaders. 2016-04-21 20:21:34 -04:00
Thomas Harte
4b9985626d Started commuting alpha to direction. The incoming amplitude is now honoured. 2016-04-21 19:53:41 -04:00
Thomas Harte
638b08302b The initial composite buffer is now genuinely a composite signal. 2016-04-21 19:37:32 -04:00
Thomas Harte
9c89b668ae Made further attempts to improve synchronisation and interrelated timing between display and machine update. 2016-04-20 22:35:46 -04:00
Thomas Harte
d9a9dffe63 Factored out wraparound buffer addressing where it's otherwise going to get really repetitive; need to look at using the same approach for the glTexSubImage2D step at least but that probably means properly encapsulating the buffer builder's state. 2016-04-20 21:05:32 -04:00
Thomas Harte
8232ed765e Eliminated use of zero-alpha runs to clear new lines in the intermediate buffer in favour of a scissored glClear. It's just an easier way to scale the current approach to three intermediate buffers. 2016-04-20 20:44:25 -04:00
Thomas Harte
e2da77fb8b Clarified constants, ensured monitor mode works from startup. 2016-04-19 22:53:39 -04:00
Thomas Harte
ef83595af3 Fixed: issue was (i) always thinking the entire source run buffer needed to be issued; and (ii) having fixed that, always thinking that the block that needs redrawing doesn't overflow the buffer. Fixed both. 'Television' mode is now working without explicit synchronisation (and with a lot less work). 2016-04-19 22:38:11 -04:00
Thomas Harte
3d7a3ce995 Eliminated some redundant texture binds. 2016-04-19 22:30:05 -04:00
Thomas Harte
145c0b3b71 Smoothed output device changes, killing some dead state. Added an explicit glFinish to suggest that the problem is synchronisation rather than any sort of data or shader error. 2016-04-19 22:21:26 -04:00
Thomas Harte
7aa87723a9 Added: key states are all cleared if the window loses focus. Which resolves sticky key issues. Allowing me just to use command+option+O for options and map both command and option as FUNC. 2016-04-19 21:29:10 -04:00
Thomas Harte
66f2c10c04 Resolved potential crash if tape requests are made without one inserted. Softened glFinish to glFlush, though I'm still not sure I should strictly need even that. 2016-04-19 21:00:48 -04:00
Thomas Harte
88e237b8de Standardised indentation and added one extra piece of documentation. 2016-04-19 20:53:55 -04:00
Thomas Harte
20aa9e291d Attempted to deal with the precision issues causing 'television' output currently to differ from 'monitor' output. Documented TextureTarget while I'm here. 2016-04-19 20:51:34 -04:00
Thomas Harte
6f52ed14d6 Trivially fixed. Appears to confirm an off-by-one error in the television implementation. Which would explain one of the visual phenomena — a repeating corrupted line. 2016-04-19 19:32:52 -04:00
Thomas Harte
b90a487a16 Attempted to enable both monitor and television output paths in the same codebase. The television route seems to be broken. Investigation required. 2016-04-19 19:30:50 -04:00
Thomas Harte
6c9bcfa637 Got rigorous on exceptions, started working towards having a working 'composite' shader at the same time as having a working RGB shader. 2016-04-19 08:05:43 -04:00