5872 Commits

This Branch

This Branch

All Branches

Author	SHA1	Message	Date
Thomas Harte	92c7d56cc3	Tiny little speed improvement. Every little helps.	2015-08-13 21:50:24 +01:00
Thomas Harte	17bbe27c9a	As an experiment, performed some very basic moving of playfield composition outside of the pixel loop.	2015-08-13 21:32:22 +01:00
Thomas Harte	033655835a	My understanding now is that object position counting will begin the cycle after the call is made, not that cycle, and that the timer loops just once, with the logic for counter pumping being whether the relevant flag is still set, irregardless of whether the counter is still going.	2015-08-13 18:59:23 +01:00
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	323aa27e13	Fixed: paging is based directly on the access, independent of the read/write line (since it isn't actually exposed to catridges).	2015-08-13 15:04:30 +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	9838e01cc1	Made a first attempt at paging.	2015-08-13 13:24:02 +01:00
Thomas Harte	9ca57b80a7	Minor steps to help with diagnostics; all commented out or merely to benefit with breakpoint placement.	2015-08-13 08:43:10 +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	687816d470	Made some attempted simplifications, implemented collisions.	2015-08-13 00:31:57 +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	42677f5f83	Fixed association of motion registers and actual registers.	2015-08-10 16:43:45 +01:00
Thomas Harte	0e52b7365e	Removed redundant code.	2015-08-10 16:42:25 +01:00
Thomas Harte	2dde2efff0	Attempted to standardise object counters.	2015-08-10 15:09:40 +01:00
Thomas Harte	a228969655	This should happen every fourth cycle.	2015-08-10 08:16:17 +01:00
Thomas Harte	3c27306a8e	My counter was going the wrong way.	2015-08-10 00:33:37 +01:00
Thomas Harte	a4e52cc4db	Made an attempt to switch to a hardware-accurate object timer model. Without yet perfect success.	2015-08-10 00:20:18 +01:00
Thomas Harte	cd67e31e64	Made a first attempt at switching a little closer to TIA's real internal counter setup.	2015-08-09 22:47:11 +01:00
Thomas Harte	987be65a59	Made a quick attempt at reimplementing skip-to-the-end logic for ready waits.	2015-08-09 02:42:01 -04:00
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	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	c1d1fb65cb	Made an attempt properly to emulate the RDY line and the Atari's use of it.	2015-07-31 16:54:20 -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	39bfbf1000	Attempted ball graphics enable delay.	2015-07-30 23:01:28 -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	78e66d2577	Added an attempt at ball rendering.	2015-07-30 21:30:00 -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	a95b36a53d	Made first attempt at missile display. In Enduro, at least, one seems to work but the other seems to be absent.	2015-07-30 21:09:18 -04:00