Thomas Harte
16731661e8
Switches back to being explicit about the colour burst phase.
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Some sort of phase inversion otherwise seems to be achievable by software that switch modes often.
2019-02-24 22:28:11 -05:00
Thomas Harte
d4134cd0d8
Restores proper colour phase to the Apple II.
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Given that its timing errors were fixed, this also switches back to using 'default' colour bursts — i.e. ones with implicit phase. The Apple II continues to be an excellent bellwether for issues in the pipeline, and this helps further to ensure that.
2019-02-24 14:35:13 -05:00
Thomas Harte
3e0b5433b9
Institutes colour/monochrome screen selection as an Apple II option.
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Allowing me to test that straight-through composite still works.
2019-02-12 19:52:32 -05:00
Thomas Harte
64465f97b6
Starts towards reintroducing the proper mechanisms for selecting a display type at runtime.
2018-11-28 17:53:33 -08:00
Thomas Harte
770d7e90e9
Removes stale sampling functions.
2018-11-22 22:47:29 -05:00
Thomas Harte
a47de9a884
Returns the Apple II to submitting video.
2018-11-14 22:04:57 -05:00
Thomas Harte
f6562de325
Possibly adds enough for the Electron and ZX80 to start outputting dummy lines.
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Let's see!
2018-11-03 23:40:39 -04:00
Thomas Harte
b40211d2c0
Starts to bend 'CRTMachine' to a world farther from owning the GPU relationship.
2018-11-03 21:54:25 -04:00
Thomas Harte
da4d883321
Adds first, incomplete attempts to talk to a ScanTarget from the CRT.
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Does away with the hassle of `unsigned` while I'm here; that was a schoolboy error.
2018-11-03 19:58:44 -04:00
Thomas Harte
a8b116e217
Turns down the Apple II brightness a little.
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So that light blue is more like a blue.
2018-09-17 20:08:20 -04:00
Thomas Harte
a38639d099
Eliminates the concept of an iCoordinate.
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Real-life precision appears not to support the idea of sub-sample pixel storage.
2018-09-12 20:05:39 -04:00
Thomas Harte
6e9cd5cb21
Resolves over-brightness created by over-composition.
2018-09-09 20:30:43 -04:00
Thomas Harte
8d79a1e381
Corrected fat low-res implementation.
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As per comment of awanderin that "the odd addresses don't get their pixels auto-shifted by the hardware as with normal lo-res".
2018-09-09 10:06:21 -04:00
Thomas Harte
d70f5da94e
Attempts an implementation of the undocumented low res + annunciator 3 graphics mode.
2018-09-08 20:51:15 -04:00
Thomas Harte
afeec09902
Gets explicit about DHIRES being annunciator 3; implements four-colour high res mode.
2018-09-06 23:23:19 -04:00
Thomas Harte
0526ac2ee2
Slightly increases const correctness.
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The converters from source data to output pixels do not modify the source data. It's a shame there's no `restrict` in C++.
2018-09-05 11:36:40 -04:00
Thomas Harte
8b661fb90f
Introduces an extra level of indirection for text mapping.
2018-09-05 10:26:08 -04:00
Thomas Harte
0599d9602e
Ensures no out-of-bounds accesses to inverses on a IIe.
2018-08-26 23:02:31 -04:00
Thomas Harte
1f491e764e
Nudges visible area slightly to the right.
2018-08-24 22:08:11 -04:00
Thomas Harte
114a43a662
Corrects improper indexing for byte shift.
2018-08-24 21:58:43 -04:00
Thomas Harte
97a89aaf4d
Factors out the stuff of deferred action interleaving, as I suspect it'll come in handy.
2018-08-24 20:04:26 -04:00
Thomas Harte
61e46399dc
About face! There should be no delay on serialisation, but a delay on interpretation-affecting soft switches.
2018-08-22 21:56:45 -04:00
Thomas Harte
e802f6ecc2
Rearranges draw loop around a fixed-size 568-sample line buffer.
2018-08-19 22:31:04 -04:00
Thomas Harte
33576aa2c4
Uses const to ensure output_* are properly constrained.
2018-08-18 21:36:48 -04:00
Thomas Harte
17bf1a64bf
Moves the stuff of generating pixels out of the main loop.
2018-08-18 18:44:31 -04:00
Thomas Harte
558b96bc05
Corrects IIe text display.
2018-08-04 16:52:29 -04:00
Thomas Harte
74a2f717b3
Turns down the composite signal amplitude a little, to help colour distinctness.
2018-08-01 18:52:42 -04:00
Thomas Harte
632b37ecec
Attempts an implementation of auxiliary memory.
2018-07-29 10:41:12 -04:00
Thomas Harte
ede2696a77
Edges further towards implementing the IIe video subsystem.
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All video-specific switches are in place, and mostly honoured, and a IIe machine configuration is advertised at least.
2018-07-24 22:15:42 -04:00
Thomas Harte
c97c5fa03a
[Re-]recalibrates CRT retrace period and affected view windows.
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In the hope of moving the CPC closer to the real CTM visible area.
2018-07-05 22:07:18 -04:00
Thomas Harte
d380595ad4
Unrolls the loops for slightly fewer conditionals.
2018-06-03 07:27:03 -04:00
Thomas Harte
d84b8700a3
Switches the Apple II to one byte per pixel.
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Just trying to get it right for now; optimisation to come.
2018-06-02 22:03:45 -04:00
Thomas Harte
69dc3cc4d8
Switches to using the same varying for byte and subpixel selection.
2018-06-01 22:52:29 -04:00
Thomas Harte
8dd7c6ef23
Eliminates 'reversed_c' as I no longer believe low-resolution colour numbers are reversed.
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Also gets explicit about phase.
2018-05-29 22:30:45 -04:00
Thomas Harte
0b771ce61a
Removes all instances of the copyright symbol.
2018-05-13 15:19:52 -04:00
Thomas Harte
aebe8a64a2
Removes empty printf.
2018-04-20 10:58:23 -04:00
Thomas Harte
e03a403a51
Adds exposition.
2018-04-19 20:41:09 -04:00
Thomas Harte
ba43b3e6b8
Reverses bit order of graphics stream; apparently the ROM is backwards.
2018-04-19 20:39:38 -04:00
Thomas Harte
5f1c210746
Simplifies and corrects low-resolution colour generation.
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Possibly disproving the premise for this whole experiment, all colours seem immediately to work correctly. Hmmm.
2018-04-18 21:41:11 -04:00
Thomas Harte
6547560e52
Gives the CRT the ability to move iCoordinate multiplication outside of the fragment loop.
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That resolves precision issues, as were plaguing the Apple II.
2018-04-18 19:29:03 -04:00
Thomas Harte
a07c99d778
Completes first draft of Apple II video hardware.
2018-04-17 22:04:02 -04:00
Thomas Harte
9bc470027e
Put enough in place to get a visual representation of video memory.
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Not the correct one, and so as to indicate that the machine isn't booting, surprisingly.
2018-04-15 19:35:08 -04:00
Thomas Harte
335c633884
Retrenches temporarily to full 8bpp output; introduces extra half a colour cycle of pause.
2018-04-15 18:54:05 -04:00
Thomas Harte
abe47b6ed8
Makes first attempt at a stable display area. Not entirely successful.
2018-04-15 18:00:40 -04:00
Thomas Harte
61659faeaa
Adds the necessary call-outs to allow implementation of video generation.
2018-04-15 15:13:07 -04:00
Thomas Harte
7efee9b52b
Does the bare minimum to create a class skeleton for Apple II implementation.
2018-04-14 19:46:15 -04:00
