316 Commits

Author	SHA1	Message	Date
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
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	34d213dec4	Decreased Y resolution, again also hopefully temporarily.	2016-12-10 15:35:38 -05:00
Thomas Harte	81a102d951	Upped intermediate buffer size, at least temporarily, while I look for the source of the interference patterns I'm seeing.	2016-12-10 15:20:10 -05:00
Thomas Harte	0e71802b92	Reduced Oric video to single nibble constants. Removed attempt at asynchronous flush as no longer required.	2016-12-10 14:17:46 -05:00
Thomas Harte	a549fd1ecc	Introduced the ability simply to piggy-back off the CRT's natural phase for the colour burst, thereby eliminating a couple of redundant independent attempts in the Oric and Electron.	2016-12-10 13:42:34 -05:00
Thomas Harte	5216dda675	Added some brief extra exposition to the texture builder, cut all internal tex_x/y and source_divider stuff from the CRT.	2016-12-06 19:08:55 -05:00
Thomas Harte	33d52bb573	Ensured no over-moving.	2016-12-06 19:02:18 -05:00
Thomas Harte	4ff33254e1	Sought to shift locking back up to the CRT. And to be a bit more RAII-ish.	2016-12-06 18:48:30 -05:00
Thomas Harte	60f9ddfde8	Fixed start test and added incrementation of start locations.	2016-12-06 08:08:57 -05:00
Thomas Harte	f388ba11cc	Missed an initialisation. Fixed!	2016-12-06 07:26:23 -05:00