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892 Commits

Author SHA1 Message Date
Thomas Harte
04b2688683 Attempted to reduce allocations. 2016-11-16 13:25:50 +08:00
Thomas Harte
c1a509910d Documented this interface, albeit that the English could do with a second pass, and very sightly simplified inline with current usage. 2016-11-16 13:15:50 +08:00
Thomas Harte
4d0d5eb919 Renamed the 'input buffer builder' to the 'input texture builder' to be explicit about what sort of buffer, and killed the prefix since it's namespaced. Also switched to std::vector. 2016-11-16 12:31:32 +08:00
Thomas Harte
4ee4400801 Removed dead code. 2016-11-16 11:57:22 +08:00
Thomas Harte
6cb4950db4 Improved run-off area. 2016-11-16 11:53:15 +08:00
Thomas Harte
9ee11d7765 At the expense of API simplicity, at least for now, resolved the most glaring cause of dirty lines. 2016-11-16 11:34:05 +08:00
Thomas Harte
44d3fd6d5b Fixed mistimed reset of the target output line. Now all that's left is occasional noise. 2016-11-16 11:22:12 +08:00
Thomas Harte
7a737e0790 Both pathways start with a buffer that clears to black. So no need to keep going on about it. 2016-11-16 11:12:08 +08:00
Thomas Harte
f63e849092 Sought completely to eliminate the outgoing concept of 'clearing zones'. 2016-11-16 11:10:34 +08:00
Thomas Harte
294adde344 Eliminated zoned clearing, in favour of a complete buffer clear on each load and attempted to reduce locking. But imperfectly. 2016-11-16 10:59:12 +08:00
Thomas Harte
ccedb6bea6 Introduced an intermediate buffer that collects lines before flushing them to the output buffer. 2016-11-16 10:49:18 +08:00
Thomas Harte
ba2adf8bb1 Normalised on std::vector rather than std::unique_ptr<uint8_t *> as (probably?) more idiomatic. Improved structure slightly. Introduced a container for line data, albeit one that isn't yet used. 2016-11-16 10:34:54 +08:00
Thomas Harte
9c550c594a Moved audio work back into its own thread, but this time it queues up an all happens only upon a flush. Hopefully to resolve synchronisation cost concerns. 2016-11-09 21:17:50 -05:00
Thomas Harte
eccfdabeab Temporarily disabled thread hop, until I can find a way to batch these things. 2016-11-03 22:52:02 -04:00
Thomas Harte
4258401384 Implemented flush, added a call to it from the filter speaker's destructor, to ensure no race conditions on accessing the various bits of instance state there and below. 2016-10-19 21:15:04 -04:00
Thomas Harte
c628b7c5c5 This is the real PAL frequency, I think. 2016-10-17 08:05:02 -04:00
Thomas Harte
1f857c619b Fixed timing issues. Static box of frame achieved! 2016-10-12 21:42:36 -04:00
Thomas Harte
00e3ad9b04 Added a bit more ceiling for lowpass filtering on constrained machines. 2016-10-10 07:51:01 -04:00
Thomas Harte
e53455a936 Not having read the C++ synchronisation primitives before, this async task queue is probably incorrect. But nevertheless, let's have a quick go at employing it — in a hideously thread unsafe fashion — for audio generation. What can possibly go wrong? 2016-10-07 16:56:34 -04:00
Thomas Harte
dab3580111 Experimental: can I afford a lower sampling rate if there's a low-pass filter in effect? 2016-08-22 22:18:05 -04:00
Thomas Harte
1541273785 Moved responsibility for throwing in a low-pass filter up to the Vic, appropriately. 2016-08-21 18:13:31 -04:00
Thomas Harte
c783090980 It turns out that the Vic has a 1.6Khz low-pass filter. So added that. 2016-08-21 12:13:41 -04:00
Thomas Harte
fef316932f Moved opening bracket appropriately. 2016-07-04 21:14:28 -04:00
Thomas Harte
8db44eed3e Added a default implementation of Speaker::skip_samples. 2016-07-04 20:48:27 -04:00
Thomas Harte
2bc87ee095 Merge branch 'master' of github.com:TomHarte/CLK 2016-07-01 16:28:18 -04:00
Thomas Harte
eefd0c17b6 Actually, I guess that to fulfil the contract I can't silently decide not to draw if I'm being told I definitely need to draw. 2016-07-01 16:27:45 -04:00
Thomas Harte
ed8f4d0476 Added some minor additional bits of documentation. 2016-06-30 08:46:29 -04:00
Thomas Harte
4ac619f569 glClientWaitSync appears to be a busy wait, at least on my machine. But why wait indefinitely anyway? 2016-06-29 21:32:47 -04:00
Thomas Harte
ff53accca0 Demonstrated that issue is coloured borders, made a guess as to buffer exhaustion, upped limits as a temporary fix. 2016-06-29 21:16:34 -04:00
Thomas Harte
2bd71e7e9b .reset is the more normal way to reassign a unique_ptr. 2016-06-23 20:52:44 -04:00
Thomas Harte
c18cc4c8f5 It appears the Vic's output is sine-ish, after all. Also adjusted centre of display, simultaneously adding some validation on that. 2016-06-14 07:29:35 -04:00
Thomas Harte
fcf4b14344 Extended to allow floating-point sampling rates. Which makes sense. 2016-06-13 19:30:41 -04:00
Thomas Harte
2992183aae Switched to a lookup table for phase, temporarily in YUV colour space, probably. Working on it. 2016-06-12 14:39:17 -04:00
Thomas Harte
68a8851c52 Increased parallelism, allowing a simplification in the GL view. 2016-06-02 22:29:09 -04:00
Thomas Harte
1e0fcbbee8 Made a very basic stab at a couple of the tone generators, added straight-through path for the speaker when input rate exactly equals output rate. 2016-06-01 19:53:16 -04:00
Thomas Harte
5c4f35e13f Finally started on generalising the C++ stuff so as to be able to be able to get a working audio binding on the OS-specific side without further repetition by factoring an appropriate protocol out from the Electron and sketching out the correct speaker class for the Atari. Added a method to ask it what a good output frequency would be. 2016-05-31 21:23:44 -04:00
Thomas Harte
4ad074fc78 Introduced a four-cycle delay between playfield fetch and display, curing Yar's Revenge. Also disabled barrel roll scanling colouring again. I really need to make my mind up on that. 2016-05-16 19:55:56 -04:00
Thomas Harte
9d92ad659f Established the basic timing loop, albeit without clocking delays yet. 2016-05-16 08:01:29 -04:00
Thomas Harte
00a2b42080 Made thread-safe. 2016-05-15 15:19:52 -04:00
Thomas Harte
091516e3cb The semantics might need better exposition but: fixed UniformXfv calls plus matrix calls, documented new semantics on all setters. 2016-05-15 14:59:59 -04:00
Thomas Harte
328fabcd10 Ensured values aren't dangling pointers. 2016-05-14 18:15:10 -04:00
Thomas Harte
492dc7ccbf Made an attempt to queue uniform changes until the next call to bind. That's to allow usage from other threads. 2016-05-14 18:06:55 -04:00
Thomas Harte
30f335fa35 Switched pervasively to using the named slot uniform setters on Shader. 2016-05-13 22:08:32 -04:00
Thomas Harte
8d52765f40 Realised why new shaders weren't taking. Very negligibly decreased Atari drawing cost. 2016-05-12 22:22:24 -04:00
Thomas Harte
6d65bc9b3a Permitted a wider error window on vertical sync, tidied things up a little and started trying to move towards full implementation of the OpenGL contract. 2016-05-11 22:11:01 -04:00
Thomas Harte
4b3c4082d2 These functions appear correctly to model the NTSC and PAL palettes; the CRT's attempt to switch function doesn't work properly yet though. 2016-05-11 21:07:18 -04:00
Thomas Harte
a8ce021136 Fixed comment. 2016-05-10 19:59:03 -04:00
Thomas Harte
0d2d6a452d Fixed some dangling buffer management issues. 2016-05-10 19:55:34 -04:00
Thomas Harte
b6d2c8cb63 Switched to instaced drawing for source[/intermediate] runs too, reducing that data transfer footprint by 50%. 2016-05-10 19:50:12 -04:00
Thomas Harte
7369139f7e Realised that phase time can fit inside a single byte, since it's always (well) within the first quarter of the line — and if it somehow weren't (?) then taking it modulo the frequency would do. 2016-05-10 19:14:57 -04:00
Thomas Harte
47ae402f7e Introduced a shorthand for setting up array attributes. 2016-05-10 19:11:48 -04:00
Thomas Harte
257420b0f7 Fixed potential output error if buffer top were hit; clarified buffer size constants. 2016-05-10 19:04:03 -04:00
Thomas Harte
309313c470 Update CRTConstants.hpp 
Lack of data duplication means this storage can be smaller.
 2016-05-10 10:49:48 -04:00
Thomas Harte
1d0bcb416d Dropped the size per output run back down to 8 bytes. 2016-05-10 07:47:47 -04:00
Thomas Harte
b0f0315f12 Fixed: this now implements 12-byte instancing for output runs. 2016-05-10 07:30:12 -04:00
Thomas Harte
86dab3a5d6 Quickest first attempt to switch to instancing for the output array. Texture coordinates seem to be off. 2016-05-10 07:23:47 -04:00
Thomas Harte
daec21d3d8 Found and fixed off-by-one error. Display should now be completely fixed. 2016-05-09 21:14:59 -04:00
Thomas Harte
59d766b325 Rationalised buffer sizes. 2016-05-09 19:17:03 -04:00
Thomas Harte
7e2bd78891 With an eye towards instancing, moved away from circular buffers. 2016-05-09 19:14:30 -04:00
Thomas Harte
ad734f341f Attempted fully to perfect memove, albeit that it's not affecting either current machine. 2016-05-09 07:44:05 -04:00
Thomas Harte
8eb058064c Fixed: ensured that the attempt to plot a misplaced write occurs correctly. 2016-05-09 07:42:26 -04:00
Thomas Harte
e6a7161e87 Made some minor corrections on the copyback of misplaced write data. 2016-05-09 07:39:57 -04:00
Thomas Harte
45af963b9a Moved more of the circular logic inside getCircularRanges in order to eliminate one more potential source of error. 2016-05-09 07:34:37 -04:00
Thomas Harte
cec9ad0dc6 Switched to a more rational interface, ensured output_level will work when eventually needed, and that neither it nor output_data attempts a recursive lock. 2016-05-09 07:02:12 -04:00
Thomas Harte
a82fa31370 Switched back to broad locking for CRT updates. To eliminate one more thing. 2016-05-09 06:58:26 -04:00
Thomas Harte
47302de23a Switched to simpler storage for _image. 2016-05-08 21:11:56 -04:00
Thomas Harte
1f02c5df88 Tidied up some further loose ends. 2016-05-08 20:58:18 -04:00
Thomas Harte
7b5982e455 Removed last mentions of 'lateral'. 2016-05-08 20:51:28 -04:00
Thomas Harte
986019f9f9 Fixed error that could lead to split output run vertex writes. 2016-05-08 20:30:59 -04:00
Thomas Harte
1a214a8308 Fence sync tied up. Remaining glitches are likely off-by-one-type errors but we'll see. 2016-05-08 19:45:36 -04:00
Thomas Harte
ef3b91d3aa Made an attempt to get formal on synchronisation. 2016-05-08 19:42:33 -04:00
Thomas Harte
dd469fe83a Switched back to normal frame drawing logic and cleaned up the circular range stuff a little, to make it clear that no errors lie there. 2016-05-08 18:50:30 -04:00
Thomas Harte
ccdbec3ffc Corrected for potential lost lines. 2016-05-08 16:43:11 -04:00
Thomas Harte
a75259ce9f Removed some dead caveman debugging statements. 2016-05-08 16:18:42 -04:00
Thomas Harte
9b2061be98 Actually, that should probably be 1/outputTextureSize, as the output range is -1 to +1. 2016-05-08 16:09:39 -04:00
Thomas Harte
9485ef2c8c At last a genuine bug fixed: was nudging the wrong amount in intermediate shaders. 2016-05-08 16:07:36 -04:00
Thomas Harte
8e4ab37719 Things are back pretty much to where they were, but offset is eliminated as an input. 2016-05-07 18:37:18 -04:00
Thomas Harte
c73751b15a Reverted deliberately broken segments to produce something mergeable. 2016-05-05 21:27:13 -04:00
Thomas Harte
a74f081aa9 Put lateral lookup table directly into the shader. 2016-05-05 21:21:27 -04:00
Thomas Harte
8284b272ad Picked appropriate new-world values for various buffers. 2016-05-05 20:00:28 -04:00
Thomas Harte
284b310074 Attempted to implement end-of-buffer tests for all stages. 2016-05-05 19:52:05 -04:00
Thomas Harte
e9a9cfb09f Fixed off-by-one error on texture upload. 2016-05-05 07:22:49 -04:00
Thomas Harte
f621cc8523 Withdrew the pixel unpack buffer in order to avoid the potential for a paused machine to be undrawable. The cost is at least an extra memcpy per frame; I'm letting the driver worry about the whole process for now. 2016-05-04 21:27:10 -04:00
Thomas Harte
2e7ac0e6db With a lot of logging also currently ongoing, fixed circular ranges for clearing and when covering an entire buffer. 2016-05-04 21:08:38 -04:00
Thomas Harte
87df57195d Started on an attempt not to treat the various buffers as free to loop within, starting with the input texture. 2016-05-04 07:39:45 -04:00
Thomas Harte
3684c6404f Proven through deliberate inefficiency: the issues are (i) texture upload; and (ii) buffer wraparound. 2016-05-03 22:22:12 -04:00
Thomas Harte
759fbd89ca Switched pixel unpack buffer back to explicit flushes. 2016-05-03 21:26:09 -04:00
Thomas Harte
2541711061 Made attempts (i) to flush buffers before unmapping them; and (ii) to bring texture uploads within the new orthodoxy. 2016-05-03 20:56:47 -04:00
Thomas Harte
fc1a67c157 Lateral is no longer written per vertex. It's a fixed list. 2016-05-03 18:45:55 -04:00
Thomas Harte
535d272039 Tweaks here, tweaks there. 2016-05-03 18:15:24 -04:00
Thomas Harte
6d5a1b33ee Turned the colour up just a little, slightly lowered luminance signal strength. 2016-05-03 07:51:14 -04:00
Thomas Harte
31f1e6d5c0 Introduced a separate stage for luminance filtering. 2016-05-03 07:46:40 -04:00
Thomas Harte
29e7c96e4c Brought monitor mode inside the pipeline and added an intermediate filter. 2016-05-02 21:05:58 -04:00
Thomas Harte
4a0e1dc789 Switched to explicit flushing of data. 2016-05-01 22:33:00 -04:00
Thomas Harte
c93bcf9f28 Discovered cause of clears: stale code. Tweaked persistence, again. 2016-05-01 22:28:33 -04:00
Thomas Harte
09ed8eb654 Quelle surprise, failure to find strikes again. Fixed. 2016-05-01 21:07:27 -04:00
Thomas Harte
1b6754c5f8 Shuffled code, realised I wasn't actually binding my shader. 2016-05-01 19:22:24 -04:00
Thomas Harte
69984b54e5 Fixed aspect ratio storage. Adjusted indentation slightly. 2016-05-01 16:49:44 -04:00
Thomas Harte
6982e945fb Fixed those issues breaking GL state, I hope. 2016-05-01 16:17:52 -04:00
Thomas Harte
4ec4cceb84 Made a first attempt at adding draw-as-a-quad functionality to texture targets. 2016-05-01 13:52:35 -04:00
Thomas Harte
2616d748fe Introduced bind-if-necessary/unbind semantics for shaders. 2016-05-01 11:07:49 -04:00
Thomas Harte
fe2abbd4ed Minor adjustments to ensure sampling occurs as intended. 2016-04-30 20:48:09 -04:00
Thomas Harte
16ef09fc2b Made an attempt intelligently to use bilinear filtering to increase filtering quality with the same number of samples. 2016-04-29 18:37:35 -04:00
Thomas Harte
501ab74eaf Fixed time multiplier calculation. 2016-04-28 22:12:59 -04:00
Thomas Harte
23ea832f41 Increased brightness in television mode, added a clear if screen resolution changes. 2016-04-28 22:04:47 -04:00
Thomas Harte
3638414b37 Added additional comments. 2016-04-28 21:55:14 -04:00
Thomas Harte
e6c3b148ac Switched wholeheartedly to the new shader. 2016-04-28 21:45:44 -04:00
Thomas Harte
8538b62ea2 Made an attempt to extract and consolidate the logic behind the intermediate shaders. 2016-04-28 21:04:59 -04:00
Thomas Harte
ef3647f6cf Being bold: per-scan timing isn't coming back, I think, so started completely removing it. 2016-04-27 23:00:43 -04:00
Thomas Harte
87c778ebb7 Fixed code use of parameter name. 2016-04-27 22:58:53 -04:00
Thomas Harte
494ef6a324 Updated documentation, taking the opportunity to improve a parameter name. 2016-04-27 22:57:40 -04:00
Thomas Harte
7c20fce467 I guess NumberOfFields is done for. 2016-04-27 22:48:37 -04:00
Thomas Harte
8849dc3265 Finished consolidation into OutputShader. With its documentation yet to update. 2016-04-27 22:41:32 -04:00
Thomas Harte
496d979aca Made a decision to clean up by creating per-shader classes. Well, more or less. First thing to be factored out: the output shader. 2016-04-27 22:29:54 -04:00
Thomas Harte
f6d58f1ce7 Played in the margins with image retention. 2016-04-26 22:14:12 -04:00
Thomas Harte
416c944f02 Experimental: let's try accumulating history directly in the framebuffer. 2016-04-26 21:41:39 -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
9b64f64db7 Attempted to normalise some style decisions.` 2016-04-24 22:32:24 -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
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
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
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
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
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
Thomas Harte
bcc784bda9 Introduced an interface for specifying attribute bindings, taking the opportunity to document the interface and introduce exceptions. 2016-04-19 07:23:15 -04:00
Thomas Harte
9d39c14752 Nothing of substance different; main current mystery: why do old frames recur and why does other jumpiness occur? Do I need some explicit synchronistion? 2016-04-18 22:18:03 -04:00
Thomas Harte
cf55a0c423 Fixed: composite output y is now incremented upon the start of retrace, that causing it to have different values at either edge of scans. 2016-04-18 21:49:45 -04:00
Thomas Harte
9580dde3ad Fixed left/right shuffling. Was simply failing to supply the integer version of coordinates. 2016-04-18 21:40:23 -04:00
Thomas Harte
d5bac2f04f Spotted error was in texture target all along. This now gets as far as showing something a lot like the correct display, but precision is way off. Way off. 2016-04-18 21:32:48 -04:00
Thomas Harte
bf29c8e2bf Fixed mismatch in television/monitor selection, ticked view for drawing concurrently, since it can, removed stray space. 2016-04-18 19:01:15 -04:00
Thomas Harte
5980f5e991 Number of taps can be specified explicitly if you desire. 2016-04-17 20:45:57 -04:00
Thomas Harte
499f7ace07 Re-enabled working video output for the Electron for the day and consolidated the rough metric I'm using to pick a number of taps for the audio filter. 2016-04-17 20:43:20 -04:00
Thomas Harte
9ede284eb6 Added blanking source runs, ensuring the rolling buffer is appropriately cleared. 2016-04-17 20:34:52 -04:00
Thomas Harte
43cae267f9 Shuffled further in an attempt to get as far as having static but incorrectly-interpreted pixel data on screen. It's not currently static. So work to do. 2016-04-17 18:08:05 -04:00
Thomas Harte
a8fbd82a3d Made an attempt at correctly mapping to eye coordinates. 2016-04-17 17:21:24 -04:00
Thomas Harte
ece51917fa Added first attempt at performing the first step of television output: mapping from source data to the first of the processing buffers. It's immediately obvious that my eye coordinates are off. 2016-04-17 17:17:59 -04:00
Thomas Harte
abce0ed3c4 Added setup of the source vertex array. 2016-04-17 16:17:23 -04:00
Thomas Harte
6ff9ffba6c Switching temporarily to an attempt to draw input runs as if RGB: shader compiles, fixed a race condition on out-of-bounds accesses for the source buffer. 2016-04-17 15:51:28 -04:00
Thomas Harte
104f44f27f Attempted to improve deinterlacing, gave the CRT full control over blend mode, switched back to 2000000Mhz audio. 2016-04-14 22:20:47 -04:00
Thomas Harte
323f1a24db Introduced blackout period solution to vertical sync confusing horizontal sync. Need to find out whether it's accurate. 2016-04-14 20:30:45 -04:00
Thomas Harte
6a17c2992d Introduced a compile-time configurable audio divider, set it arbitrarily to '8' for now. Discovered why my graphics aren't centred and added a TODO. 2016-04-13 22:31:59 -04:00
Thomas Harte
026ce0255f Source runs are now captured, and that buffer appropriately reset. 2016-04-13 22:20:13 -04:00
Thomas Harte
2ea02ed127 A source array buffer is also now created, mapped, unmapped, etc. 2016-04-13 22:14:18 -04:00
Thomas Harte
04d1b65c93 Reinstated texture target creation, cut them down to merely RGB. 2016-04-12 22:48:47 -04:00
Thomas Harte
4be8053ba9 Updated documentation. 2016-04-12 22:38:49 -04:00
Thomas Harte
4d889d9c7f Made an attempt slightly to simplify the fragment processor, at both ends. 2016-04-12 22:35:11 -04:00
Thomas Harte
fe8b0ebc7e Tidied up a little, mostly bumping things out of just-in-time creation that I can just do well in advance. 2016-04-12 22:31:13 -04:00
Thomas Harte
069ec2e889 In search of the cause of performance issues again, excised the per-pixel sin until it can be further evaluated. 2016-04-11 23:13:54 -04:00
Thomas Harte
d100c755b7 The final line runs on a diagonal. Leave room for that. 2016-04-11 23:13:14 -04:00
Thomas Harte
7276a06cc0 Added a helper to calculate a visible rect based on output timings, used it to scale the Electron output up to the full window size. 2016-04-11 21:47:23 -04:00
Thomas Harte
e45fe43801 Removed some dead caveman debugging. 2016-04-10 23:02:34 -04:00
Thomas Harte
bdb99ba92f Corrections back towards composite output: fixed misnamed constant, ensured the CRT doesn't write nonsense to the output buffer, ensured it grows three vertices at a time rather than six when desired. Net effect should be that the output stage is working again, with the input processing remaining to fill in. 2016-04-10 22:56:52 -04:00
Thomas Harte
8701366277 Switched horizontal sync detection back to differential, switched the Electron to an XOR-style sync output (believed to be accurate, but I need to check), fixed some latent issues around vertical sync detection. 2016-04-10 21:34:40 -04:00
Thomas Harte
fc5530b513 Realising I've managed to confuse input and output, started shift to 'source' for what 'input' was. 2016-04-10 15:58:43 -04:00
Thomas Harte
6dbd20ffde Expanded interface to rgb_sample to eliminate its need to make assumptions about globals, used expanded interface to compact Electron data to two pixels per byte. 2016-04-05 20:32:55 -04:00
Thomas Harte
c0cd1ed89e Made an attempt to consolidate timestamp bases to a single vector and hence to lump all geometry into one or two calls, with no repetitive setting of a uniform. I'm not sure the result is correct yet. 2016-04-04 21:57:27 -04:00
Thomas Harte
729fddea1c Switched to integer textures, likely to simplify for most use cases. 2016-04-04 19:39:01 -04:00
Thomas Harte
3ca58b2a57 Attemted further to diminish jumpiness. 2016-03-22 22:07:30 -04:00
Thomas Harte
8cd5d40e00 Made an attempt to reduce the amount of data heading to the GPU. 2016-03-22 21:16:32 -04:00
Thomas Harte
3038704977 Attempted to introduce a lowpass filter to the graphics output, reverted 6502 optimisations as seemingly not working. 2016-03-21 22:01:25 -04:00
Thomas Harte
197cf2a834 Commented out sync; it can probably be implicit. 2016-03-20 21:42:05 -04:00
Thomas Harte
9da7716c72 Attempted to simplify threading, thereby allowing machines to be constructed within a valid GL context, and started adding appropriate GL syncs. Which all oddly drops everything to a negligible FPS. Investigation will follow. 2016-03-19 22:46:17 -04:00
Thomas Harte
aa8a192c7e Simplified API down to their being a single texture with a specified depth. 2016-03-19 17:37:55 -04:00
Thomas Harte
4ac1f959e9 A shortcut here and a shortcut there; this allows me at least to determine whether use of a PBO gains anything. 2016-03-19 17:07:05 -04:00
Thomas Harte
5b37a651ac Made an attemp to deal with glUnmapBuffer(GL_ARRAY_BUFFER) == GL_FALSE. 2016-03-18 21:35:52 -04:00
Thomas Harte
0b1c9fb291 Ensured I don't interrupt triangle strips for the purpose of glDrawArrays. 2016-03-18 21:28:53 -04:00
Thomas Harte
620257e29e Switched to a client wait, as I try to figure out what's going on. 2016-03-18 21:21:35 -04:00
Thomas Harte
2e4af90e2d Resolved output errors. 2016-03-18 21:19:11 -04:00
Thomas Harte
10bc33464d I don't think this is quite correct, but it's better. 2016-03-18 21:14:06 -04:00
Thomas Harte
61e880de03 Keeping a buffer permanently bound is apparently illegal. So back to copying in on demand. Which I think still improves on synchronisation, but not much. 2016-03-18 21:11:09 -04:00
Thomas Harte
c8ecfb89d8 Some cleaning. 2016-03-16 22:52:33 -04:00
Thomas Harte
0d27d3bb7f As messy as it is, this use glMapBufferRange to avoid explicit buffer submits. 2016-03-16 22:29:22 -04:00
Thomas Harte
ca35a7e222 Ensured that a much greater input rate than output is handled correctly. 2016-03-16 20:38:17 -04:00
Thomas Harte
4cd0aa3416 Completed FIR filter based audio output. 2016-03-15 23:37:35 -04:00
Thomas Harte
726c98446a Fixed a couple of memory leaks, at least got as far as instantiating a filter. 2016-03-15 21:34:00 -04:00
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. 2015-07-26 15:13:46 -04:00
Thomas Harte
dd428c5d4d Slightly relaxed time it takes to recognise vertical sync; considered what to do about reviving proper vertical sync but then gave up. 2015-07-24 23:56:25 -04:00
Thomas Harte
cea2580000 Upped internal precision a little. 2015-07-24 23:36:44 -04:00
Thomas Harte
ecb2898bd5 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. 2015-07-24 23:29:45 -04:00
Thomas Harte
d72287a776 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. 2015-07-23 19:24:25 -04:00
Thomas Harte
33c06baffa 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. 2015-07-23 18:53:18 -04:00
Thomas Harte
5203f31bf4 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. 2015-07-22 20:45:10 -04:00
Thomas Harte
065050115f Made an attempt to switch to a triple-buffering scheme for CRT outputs, with an eye towards asynchronicity. 2015-07-22 20:33:20 -04:00
Thomas Harte
b503e13380 Fix one: vertical scan speed was failing to allow for the number of cycles in a line. 2015-07-22 18:56:35 -04:00
Thomas Harte
963cb2f6fb Attempted to switch to slightly more meaningful names within the CRT and implemented a delegate to investigate output. Working on it. 2015-07-22 18:15:18 -04:00
Thomas Harte
908c171d2d Commented the heck out of this thing, to put my thoughts in order if nothing else. 2015-07-21 16:37:39 -04:00
Thomas Harte
a1a1b15d18 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. 2015-07-20 23:18:56 -04:00
Thomas Harte
4fa315ab4d 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. 2015-07-20 21:58:32 -04:00
Thomas Harte
4695295dd1 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. 2015-07-20 21:43:00 -04:00
Thomas Harte
4e4c082a05 Made some minor attempt at proper sync response. I think I've gone way off piste and overcomplicated it. 2015-07-19 23:43:22 -04:00
Thomas Harte
4a1e9fe2a8 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. 2015-07-19 21:21:34 -04:00
Thomas Harte
7df5025eef 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. 2015-07-19 18:32:42 -04:00
Thomas Harte
6f78ecdc9c Made first genuine attempt at outputting a meaningful CRT stream. Which shows some significant errors. So work to do. 2015-07-19 16:48:14 -04:00
Thomas Harte
2d0f861474 Incoming: a 'CRT' class, to receive information intended for a cathode ray tube. To decode sync, etc. 2015-07-19 13:36:27 -04:00