157 Commits

Author	SHA1	Message	Date
Thomas Harte	0b081831a9	Set up a pipeline for all pixels that attempts to allow for appropriate delays.	2016-05-24 07:58:26 -04:00
Thomas Harte	5c1e594937	Realised there's a clocking delay on starting horizontal move. Which fixes Coke Zero.	2016-05-22 21:45:40 -04:00
Thomas Harte	c3e719c4ab	Added missile-to-player offsetting. Completing the list of graphics-related TODOs.	2016-05-22 17:01:56 -04:00
Thomas Harte	4c6d4d899d	Ensured that resetting the horizontal timer affects phase.	2016-05-22 16:29:53 -04:00
Thomas Harte	df93d7849d	Re-enabled the ball.	2016-05-22 14:38:14 -04:00
Thomas Harte	0242924fb4	Various bits of caveman debugging appearing and disappearing, switched to latching ball behaviour.	2016-05-22 14:26:02 -04:00
Thomas Harte	5e220562e4	Actually, the four-clock delay, with palette taking effect immediately, appears to be correct. So back to the drawing board on that.	2016-05-21 21:44:54 -04:00
Thomas Harte	4eded9b9d0	Re-enabled collisions.	2016-05-21 13:05:36 -04:00
Thomas Harte	b1c84f5402	Counters run every scan line regardless of blank and sync. Also played further with timing.	2016-05-21 12:54:39 -04:00
Thomas Harte	470c90428a	Switched to two-register implementation of VDELP, etc.	2016-05-21 10:26:27 -04:00
Thomas Harte	36d19cb6cf	Made an attempt at properly pumping timers during hmove.	2016-05-21 10:18:15 -04:00
Thomas Harte	a952813036	Fixed missile sizes, played about with ball placement.	2016-05-19 18:30:17 -04:00
Thomas Harte	cf5b8ab92e	This is now approximately back to where it was on Cosmic Ark.	2016-05-19 08:30:10 -04:00
Thomas Harte	40600b4bcb	Made sprite placement consistent at least. Not necessarily yet correct.	2016-05-18 22:07:24 -04:00
Thomas Harte	e61392d3fb	Fixed incorrect duplication.	2016-05-18 21:50:28 -04:00
Thomas Harte	8c7ce1ec3f	Attempted to fix sprite sizing and, again, missile repetition.	2016-05-18 21:41:25 -04:00
Thomas Harte	d013d46337	Fixed object motion decoding and checking of the repeat mask for missile graphics.	2016-05-18 21:36:28 -04:00
Thomas Harte	83ed6a82cf	Fixed: asserting vertical blank doesn't affect underlying timing.	2016-05-18 18:49:40 -04:00
Thomas Harte	877c55b5c5	Threw in missiles. To 'complete' graphics output. Or, rather, to move me on to debugging.	2016-05-18 07:54:44 -04:00
Thomas Harte	354143a78c	Reintroduced an attempt to plot sprites.	2016-05-18 07:51:25 -04:00
Thomas Harte	0b99649b0f	Had a first shot at triggering player and missile resets.	2016-05-18 07:31:05 -04:00
Thomas Harte	b8708b805c	The vertical blank flag now works again.	2016-05-17 22:02:57 -04:00
Thomas Harte	a1e63e8320	Attempted to generalise on pixel counter storage, at least. Further adjusted background timing but I'm still not sure.	2016-05-17 21:41:32 -04:00
Thomas Harte	ad6f405483	Fixed: was off by one on pixels, allowing four extra pixel output cycles per line.	2016-05-17 19:02:32 -04:00
Thomas Harte	c96674b341	Made genuine first approximate attempt at hmove.	2016-05-17 18:35:40 -04:00
Thomas Harte	d170bb14e6	Extended scheduling plans, inserted initial events for hmove, albeit not yet implemented.	2016-05-17 18:21:49 -04:00
Thomas Harte	6a961c4d28	Added something of the ball counter, but without yet a working HMOVE it's prone to error.	2016-05-17 07:18:14 -04:00
Thomas Harte	7d3cf76576	Generalised slightly, to allow events to be queued up to eight cycles in advance; most importantly each event gets to pick its own delay.	2016-05-17 07:09:18 -04:00
Thomas Harte	3d003070b3	Made an attempt better to generalise the idea of things with 4 CLK delays.	2016-05-16 21:54:27 -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	f19ed2e8f8	Started merely attempting to reintroduce the background layer.	2016-05-16 19:04:13 -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	cca53598d3	Made another run at 2600 colours.	2016-05-14 16:52:24 -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	1142c86811	Slightly simplified conditional.	2016-05-07 18:38:51 -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	3af97d4069	Eliminated redundant variable.	2016-04-26 19:57:05 -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	7a8d100861	Found a new working formula for NTSC Atari 2600 colours.	2016-04-24 22:02:00 -04:00
Thomas Harte	d221c712b0	Ensured GL context is active when destructing CRTOpenGL.	2016-04-24 20:34:25 -04:00
Thomas Harte	db908a7547	Adjusted Atari to using its non-standard line lengths.	2016-04-24 19:23:30 -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	80a3169674	Started reviving the Atari 2600 emulation. Put new startup sequence into place.	2016-04-24 06:56:08 -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	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	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	5c8db71c64	Corrected some constants, ensured both machines (so far) are setting the output device.	2016-03-05 16:19:10 -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	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	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	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	de7218cdf0	Added a lot of commenting to the CPU6502 definition, simplifying its construction. Added missing nullability modifier to CSElectron. Fixed bad-habit Objective-C style naming on the Electron's Interrupt enum.	2016-01-20 21:55:38 -05:00
Thomas Harte	ab45c1d530	Started working on a shell for the Electron emulation, including factoring out the common CRT delegate -> Objective-C bridging, serial dispatch queue and frameskipping logic from the Atari 2600 shell.	2016-01-04 23:12:47 -05:00