334 Commits

Author	SHA1	Message	Date
Thomas Harte	55fd9122d0	Slightly relaxed vertical sync testing.	2017-07-30 21:19:42 -04:00
Thomas Harte	0bf4fdc9af	Simplified slightly.	2017-07-29 21:37:59 -04:00
Thomas Harte	ed8c73eb14	Ensured lengthy constant sync can't appear to be two sync pulses, regardless of other interruption.	2017-07-29 18:25:04 -04:00
Thomas Harte	3528a7f78b	Made an attempt at triggering vertical sync the expected number of time after it begins, regardless of total length.	2017-07-29 17:33:52 -04:00
Thomas Harte	54bcc40192	With an eye towards being more accurate as to vertical sync recognition: acknowledged that the detection period varies between PAL and NTSC.	2017-07-29 14:53:53 -04:00
Thomas Harte	be750ee427	Eliminated all dangling implicit signedness conversions.	2017-07-21 21:52:37 -04:00
Thomas Harte	449c33ee8b	Signedness fixes.	2017-07-21 21:28:04 -04:00
Thomas Harte	ef03c84b21	More definitively removed the old sample-offset blending approach to filtering.	2017-07-21 20:58:55 -04:00
Thomas Harte	5b4c5b0cbf	Avoided having two different variables named next_output_run.	2017-07-21 20:46:08 -04:00
Thomas Harte	8ccec37a4b	Eliminated a further potential cause of texture/geometry mismatch: the texture retain succeeded but then there wasn't room for geometry.	2017-07-09 19:11:38 -04:00
Thomas Harte	a25c2fd6b5	Got more explicit about what the thinking is here re: multiple sources of action.	2017-07-09 17:54:26 -04:00
Thomas Harte	ee1a9a4781	Eliminates attempts cleverly to shuffle unsubmitted runs, because no mechanism exists to stop them overwriting previously-submitted-but-not-yet-flushed runs. Which implies that the buffer must be fully circular. The cost of which is sometimes having to make two calls to glTexSubImage2D. Also added some TODOs, and a means for reporting when a retain_latest is ineffective, in which situation it would be inappropriate to attempt to generate correlated geometry	2017-07-09 17:50:22 -04:00
Thomas Harte	2f90f35478	Ensured the same write area can be submitted multiple times — this is actively used if a run of data overlaps a flywheel-suggested sync. Which nullifies the idea of not having a write area in the barrel, at least as soon as any one has been allocated.	2017-07-07 23:37:44 -04:00
Thomas Harte	12f7e1b804	Enshrined a default colour burst amplitude. Which now everybody relies on. The 102 figure is derived from the burst apparently being 40 IRE.	2017-07-07 23:35:14 -04:00
Thomas Harte	c7fa2ed11a	It makes more sense not to retain the previous texture builder run until vertex storage is confirmed.	2017-07-07 23:21:25 -04:00
Thomas Harte	bfbe12b94b	Made an attempt further to tie geometry and texture generation fully together, removing the assumption that the caller will achieve one-to-one calling.	2017-07-07 22:25:05 -04:00
Thomas Harte	ab1374f801	Added an assert on an assumed buffer size alignment.	2017-07-06 21:46:24 -04:00
Thomas Harte	344d267fd2	Introduced sharper chrominance for genuinely black-and-white signals.	2017-07-06 21:38:33 -04:00
Thomas Harte	4211389ac7	Connected machine-supplied colour burst amplitude to shader, discarding hard-coded value. Net effect: the colour component is now discarded for the ZX80 and 81.	2017-07-06 21:29:08 -04:00
Thomas Harte	c6d00ec7d1	Switched phase and amplitude varying to a 3d vector; the third component is 1/amplitude if amplitude is non-zero, and zero otherwise. So you can multiply by that to get chrominance, rather than dividing by amplitude. With the direct effect that detected chrominance should automatically be zero if the colour burst didn't exist (i.e. had zero amplitude).	2017-07-06 21:25:38 -04:00
Thomas Harte	a5075d9eb5	Formalised the reasoning behind the colour phase fix-up and made it an opt-in per-caller value. Only the Oric currently needs to opt in.	2017-05-16 20:31:39 -04:00
Thomas Harte	c2b5a9bb1f	Minor fix: given that phase is now a function of position, stop nudging position.	2017-05-13 21:50:48 -04:00
Thomas Harte	b14c892740	Switched to a safer RAII approach to this lock.	2017-05-10 21:29:39 -04:00
Thomas Harte	e01f3f06c8	Completed curly bracket movement.	2017-03-26 14:34:47 -04:00
Thomas Harte	e63229a5e5	Pulled vertical sync detection entirely outside the loop, and gave it greater perspective.	2017-03-06 19:15:33 -05:00
Thomas Harte	ad73379d1c	Took vertical sync detection logic entirely out of the loop.	2017-03-05 20:17:55 -05:00
Thomas Harte	4751615623	Fixed NTSC colour cycle count, and hence the 2600's reported line lengths and phase offset.	2017-03-04 17:31:39 -05:00
Thomas Harte	a3fcd15980	Loosened sync charge level requirement.	2017-03-01 22:16:56 -05:00
Thomas Harte	d19f26887d	Performed a very naive shuffling of output builder sets onto the OpenGL queue. Which makes the frequency switcher work properly from it's possibly-contextless thread.	2017-02-20 10:39:31 -05:00
Thomas Harte	6cb95b4fc5	Switched to passing around std::strings rather than char *s, because they should be easier to capture.	2017-02-20 10:35:33 -05:00
Thomas Harte	d979a822ac	Introduced a deferred task list for the OpenGL thread.	2017-02-19 21:46:07 -05:00
Thomas Harte	fccdce65b9	Switched to lock guards.	2017-02-19 21:45:28 -05:00
Thomas Harte	97cdfea9e9	Resolved spurious static analyser complaint: input_size and output_size aren't supposed to have defined values if input or output is null. But whatever.	2017-02-11 13:36:09 -05:00
Thomas Harte	fcf8cafb5d	Sought to ensure that communicating a colour burst in multiple parts doesn't ruin the phase.	2017-02-06 18:27:44 -05:00
Thomas Harte	23f3ccd77a	Made a further attempt to prevent overwrites.	2017-02-05 17:47:34 -05:00
Thomas Harte	ebde955356	This needs to be a memmove as the areas may overlap.	2017-01-29 16:12:48 -05:00
Thomas Harte	7fd02e7f4c	Added an extra flag to avoid potential race condition on is_full_, being reset from the background despite a write area not having been allocated.	2017-01-29 16:11:29 -05:00
Thomas Harte	c2d7e36c8f	Ensured logic for whether composite output is in use is consistent.	2017-01-25 21:25:03 -05:00
Thomas Harte	4d6e78e641	Reinstated temporary Oric-related fix.	2017-01-24 22:16:15 -05:00
Thomas Harte	5761c8267b	[Re-]Eliminated connection between colour subcarrier frequency and monitor output mode.	2017-01-24 20:48:54 -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	7ad64ff16b	Made further efforts to support throughput via memory barrier.	2017-01-08 14:47:16 -05:00