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Author	SHA1	Message	Date
Thomas Harte	6f78ecd12b	Added a small pictorial example. Hardly the best, but a step in the right direction.	2017-01-12 22:06:45 -05:00
Thomas Harte	ced644b103	It seems likely that an AY divides its clock by 8, not 16. I had conflated wave frequency and counter clock.	2017-01-11 22:03:01 -05:00
Thomas Harte	be1cb2a551	Fixed NTSC phase.	2017-01-11 21:31:24 -05:00
Thomas Harte	b4159295f6	Switched to using quads for intermediate draws. The specific concern is the flexibility offered in the GL spec as to line drawing algorithms. And even if a driver implements exactly to spec then it should omit the final pixel.	2017-01-11 21:18:41 -05:00
Thomas Harte	d0a93409e6	Made an attempt to simplify in-shader phase calculation, now that output position is a direct multiple of phase.	2017-01-11 08:18:00 -05:00
Thomas Harte	4c3669f210	Reduced precision of input phase, but I'm not necessarily persuaded by it as a move. However it's clear that something is off in that whole area. But if phase is locked by output position, do I need to retain this level of complexity? Also ensured that intermediate buffers prior to the final are sampled using the nearest sampling mode, also to reduce precision errors.	2017-01-10 22:08:07 -05:00
Thomas Harte	eeb646868b	Switched off filtering, at least temporarily, to try to ensure that sampling is all where it should be.	2017-01-08 19:53:08 -05:00
Thomas Harte	3d789732a2	Switched back to full buffer clearing. Until I can figure out the source of noise.	2017-01-08 19:50:31 -05:00
Thomas Harte	d2a7d39749	Ensured the output lock isn't held while talking to the delegate.	2017-01-08 19:49:21 -05:00
Thomas Harte	9521718120	Colour phase is multiplied by 255, not 256.	2017-01-08 17:21:26 -05:00
Thomas Harte	28909e33ca	Eliminated phaseCyclesPerTick as implied.	2017-01-08 16:48:02 -05:00
Thomas Harte	79632b1d34	Instituted de-escalating phase-related extensions, definitively to kill rounding error edges.	2017-01-08 16:24:22 -05:00
Thomas Harte	cf6d03e35c	Merge branch 'master' into PhaseAlignedSampling	2017-01-08 14:49:40 -05:00
Thomas Harte	4a4b31a15c	Merge pull request #94 from TomHarte/ElectronDisks ... Fixes the Electron's ability automatically to launch a disk	2017-01-08 14:48:58 -05:00
Thomas Harte	f3d9aec8fc	Fixed Electron's support for automatically booting floppy disks.	2017-01-08 14:47:41 -05:00
Thomas Harte	7ad64ff16b	Made further efforts to support throughput via memory barrier.	2017-01-08 14:47:16 -05:00
Thomas Harte	6153ada33b	Fixed Electron's support for automatically booting floppy disks.	2017-01-08 14:46:19 -05:00
Thomas Harte	be48c950b4	Started taking steps towards using a texture barrier where possible to reduce all of my framebuffer binds. Some output appears, but it's not correct.	2017-01-08 11:13:20 -05:00
Thomas Harte	0487b8c178	Definitively eliminated the additional y filtering step; if I'm going to work to ensure always four samples per colour cycle, I can put the channel separation coefficients directly into their shaders, cutting down on samples.	2017-01-07 16:02:33 -05:00
Thomas Harte	5740015f56	Temporarily disabled composite processing to show the pure stream. Fixed both automatic calculations of phase — per line and, at input, per pixel.	2017-01-07 12:38:00 -05:00
Thomas Harte	c84004bfa3	Fixed: colour_cycle_numerator_ doesn't need to be multiplied by the time multiplier because it'll get that for free from the calculation of next_run_length.	2017-01-06 21:36:19 -05:00
Thomas Harte	c746a3711f	Temporarily disabled my attempt to be clever with bilinear filtering when applying a lowpass filter. Will need to investigate.	2017-01-04 08:06:18 -05:00
Thomas Harte	aa7774a9a6	Experimental: up the chroma accuracy, just let the luma go straight through. Subject to figuring out how I'm still losing so much precision.	2017-01-03 22:41:34 -05:00
Thomas Harte	a836120945	Restored proper colour separation, but somewhere a massive hit in horizontal resolution is happening — much greater than one would expect from the sample size picked. So investigation to come.	2017-01-03 22:32:07 -05:00
Thomas Harte	7d60df9075	Added the option for both intermediate and output shaders to use only a portion of the input/output texture; made an attempt to pick an appropriate proportion in order to align signal sampling with the colour subcarrier.	2017-01-03 22:16:52 -05:00
Thomas Harte	f2b8b26bc4	Started throwing some comments into my shaders.	2017-01-03 21:16:38 -05:00
Thomas Harte	9d60172571	Merge pull request #93 from TomHarte/ReadWriteTrack ... Implements the Type 3 WD177x commands	2017-01-01 21:01:56 -05:00
Thomas Harte	eca3995481	Added a CRC check for read address, ensured CRC, lost data and record not found are initially reset.	2017-01-01 21:00:25 -05:00
Thomas Harte	044c920a5b	Made it more explicit that there are no unhandled cases.	2017-01-01 20:56:52 -05:00
Thomas Harte	0df9ce5a76	Made an attempt at read address. So superficially that leaves only the force interrupts.	2017-01-01 20:55:09 -05:00
Thomas Harte	f94f34f053	Made an attempt at read track. Which means process_input_bit can't just swallow syncs any more; it now reports them as tokens of type ::Sync.	2017-01-01 20:39:19 -05:00
Thomas Harte	4ad2d2bedd	Merge branch 'master' into ReadWriteTrack	2017-01-01 20:04:22 -05:00
Thomas Harte	e28f72d919	Merge pull request #90 from TomHarte/TravisCI ... Introduces a shared Xcode scheme plus a first attempt at Travis CI integration	2017-01-01 20:03:26 -05:00
Thomas Harte	c994fa39f6	Ensured spin-up doesn't occur if there's no motor line.	2016-12-31 16:18:30 -05:00
Thomas Harte	1ea4f0d79d	Made an attempt to implement 'write track' and ensure that 'write sector' can't end without announcing that it has ended writing.	2016-12-31 16:01:44 -05:00
Thomas Harte	0689df1349	Merge pull request #92 from TomHarte/MFMCleanup ... Adds some documentation and tidies some of the new MFM infrastructure	2016-12-31 15:32:11 -05:00
Thomas Harte	b3c33d993a	Made an attempt to explain the requirements placed upon Disk subclasses that wish to support writing.	2016-12-31 15:30:48 -05:00
Thomas Harte	8eb21c6702	The "MFM...Byte"s aren't MFM-specific, they're relevant to both FM and MFM encoding. So renamed them. Also slimmed syntax within MFM.cpp mostly where emigration from the Acorn disk analyser had left a residue of lengthy namespace specification.	2016-12-31 15:25:11 -05:00
Thomas Harte	4c62487e6e	Merge pull request #91 from TomHarte/TableCRC ... Switches to a table-based implementation of CRC generation	2016-12-31 14:16:17 -05:00
Thomas Harte	a147d56ce6	Switched to a table-based implementation of CRC generation, adding construction cost to cheapen running cost.	2016-12-31 14:15:20 -05:00
Thomas Harte	7b696b0962	Switched scheme to shared.	2016-12-31 13:11:07 -05:00
Thomas Harte	57bb771fb7	It looks like spaces are automatically escaped (?)	2016-12-31 13:05:55 -05:00
Thomas Harte	5201a59c44	Attempted to introduce Travis CI.	2016-12-31 13:03:32 -05:00
Thomas Harte	df6e98fa52	Merge pull request #89 from TomHarte/OricDiskWrites ... Adds write support for the Oric .DSK file format	2016-12-31 12:53:43 -05:00
Thomas Harte	52b850a3f5	Quick extra: make sure parsed tracks don't overflow the 6400 byte space available in an MFM disk. Which might be better expressed as 6250?	2016-12-31 12:51:52 -05:00
Thomas Harte	cfbab1448c	Switched to a track parsing that disallows synchronisation values within sector contents.	2016-12-31 12:23:08 -05:00
Thomas Harte	12549ff412	Might as well get the file offset before entering the critical section; also moved the lock guard down more explicitly to group with the second set of actions.	2016-12-31 11:48:46 -05:00
Thomas Harte	6f0b5427e4	Made an attempt to avoid repetition of sync bytes.	2016-12-31 00:20:00 -05:00
Thomas Harte	0123b37213	Made an attempt to include sync values in the stream and properly to align.	2016-12-31 00:11:31 -05:00
Thomas Harte	ea4d85e1cd	The virtual disk constructed is the same across all tracks. So why not just request zero?	2016-12-31 00:10:35 -05:00