Thomas Harte
80cf3d9301
Formally gave the 2600 responsibility for providing the code that decodes one of the things it has put into a buffer into a composite sample.
2015-09-03 12:28:16 -04:00
Thomas Harte
ac8fc9a1a0
Experimenting with pre-encoding luminance and chrominance separation over on the
...
CPU as otherwise the GPU does them repetitively and more awkwardly (as it's working purely in floats). It means uploading twice as much data though, so I don't
know. Still only half as much as the RGBA path of a few days ago. Will experiment.
Also slightly adjusted division of responsibility in the fragment shader per the
desire to have the `sample` function owned externally.
2015-09-03 11:15:23 -04:00
Thomas Harte
11acf3f2d3
Made some further minor attempted improvements.
2015-09-02 20:51:56 -04:00
Thomas Harte
161450942a
Removed outdated comment. This is better now than it was.
2015-09-02 17:20:23 -04:00
Thomas Harte
0d6094d842
Attempted very basic vectorisation, plus some minor other clean-ups.
2015-09-02 17:17:22 -04:00
Thomas Harte
f60ba4f487
Added a note about horribleness to the source. You never know who's looking.
2015-09-01 22:38:15 -04:00
Thomas Harte
cb6e6e8acb
It's the worst fragment shader you'll ever see. The worst. But this attempts NTSC composite video emulation, artefacts included.
2015-09-01 22:36:45 -04:00
Thomas Harte
5fe0cff692
Fine. I'll accept 'bin' files if I must.
2015-08-19 21:36:50 -04:00
Thomas Harte
043d2f9896
It sounds like the two sync signals are exclusive ORd.
2015-08-19 21:36:33 -04:00
Thomas Harte
3c3c4d2f7c
Enlarged drawing range a little.
2015-08-19 21:35:26 -04:00
Thomas Harte
c5e480cfae
Threw in missile repeats.
2015-08-19 09:46:57 -04:00
Thomas Harte
28fad66272
Okay, so I had those constants transposed. What a klutz I've been!
2015-08-19 09:09:00 -04:00
Thomas Harte
f74d9ee373
Copied in quote. So that I can stop looking it up.
2015-08-18 22:36:32 -04:00
Thomas Harte
a62c7f5c56
At last! Discovered CRT scanning bug; was always moving by the full proposed run length along the scan, not the time until the next event. Using this, have implemented proper vertical sync at last (I think). Have disabled scanline banding too, as now everything meets up it's more helpful to be able to see with clarity.
2015-08-18 22:22:47 -04:00
Thomas Harte
462a791ed3
Ensured that no backlog accumulates of cycles to run. Otherwise the background queue was lagging behind.
2015-08-18 21:13:54 -04:00
Thomas Harte
ca6b54536e
Added fire and reset inputs.
2015-08-18 20:58:05 -04:00
Thomas Harte
88d5064737
Not that it makes a lot of difference, there being no names to mangle, but moved the closing #ifdef __cplusplus to the idiomatic place.
2015-08-18 20:33:59 -04:00
Thomas Harte
bc805a90fe
Wired up joystick directions, at least, and fire button presses get as far as the C++. But there's some latching to figure out before they'll work.
2015-08-18 20:33:24 -04:00
Thomas Harte
902795d61c
Switched vertical sync detection method, at least for now. They never happen automatically (I need to fix that) and just always take effect if detected in the lower half of the display. PAL/NTSC is determined just by looking at the refresh rate.
2015-08-18 00:17:03 -04:00
Thomas Harte
d21ccddeef
Fixed: _vBlankExtend is now cleared at the correct moment.
2015-08-17 17:54:36 -04:00
Thomas Harte
a33d31d02a
Fixed to allow loading of ROMs less than 1kb in size.
2015-08-17 00:34:01 -04:00
Thomas Harte
083b678785
Quickie: observed that the initial position is one scanline dirty, not zero. Also switched to a size_t on the write pointer, size_t being the correct C size for into-memory offsets.
2015-08-17 00:25:32 -04:00
Thomas Harte
df68aeff5a
Fixed: made sure that _vBlankExtend resets itself even on non-pixel lines.
2015-08-17 00:09:28 -04:00
Thomas Harte
414849f166
Confirmed: pixel counters are not paused by programmatic vertical blank.
2015-08-16 17:34:20 -04:00
Thomas Harte
cde9bb7ebc
Put common shift step into a macro.
2015-08-16 16:12:20 -04:00
Thomas Harte
a693c081f8
Switched on the appropriate compiler warnings re: signed comparisons and implicit conversions. Fixed all less-than-explicit calls.
2015-08-16 16:08:29 -04:00
Thomas Harte
1cc479affd
Removed redundant GL call.
2015-08-16 15:40:03 -04:00
Thomas Harte
410c09cb35
Made attempt not to touch the _collisions registers (which are instance variables) unless the local variables imply it's potentially necessary. So that's a broad phase on collisions, I guess.
2015-08-16 15:39:40 -04:00
Thomas Harte
40cb1cf60d
... and the ball graphic.
2015-08-16 11:24:33 -04:00
Thomas Harte
afaa86a649
Minor thing: skip the internal counter stuff if we're definitely going to end up with a transparent pixel anyway for the player and missile graphics.
2015-08-16 11:23:46 -04:00
Thomas Harte
4b5aabdd54
Attempted to take even more out of the inner pixel loop.
2015-08-13 23:23:04 +01:00
Thomas Harte
391789e75c
Removed stray space.
2015-08-13 23:22:51 +01:00
Thomas Harte
cbe76ea5d5
Got rid of the thread hopping in order to redraw the GL view. Which appears to help significantly with total application cost.
2015-08-13 22:01:25 +01:00
Thomas Harte
92c7d56cc3
Tiny little speed improvement. Every little helps.
2015-08-13 21:50:24 +01:00
Thomas Harte
17bbe27c9a
As an experiment, performed some very basic moving of playfield composition outside of the pixel loop.
2015-08-13 21:32:22 +01:00
Thomas Harte
033655835a
My understanding now is that object position counting will begin the cycle after the call is made, not that cycle, and that the timer loops just once, with the logic for counter pumping being whether the relevant flag is still set, irregardless of whether the counter is still going.
2015-08-13 18:59:23 +01:00
Thomas Harte
b440fed323
Fixed a couple of incorrect references to horizontal constants or calculations where the intention is to use vertical.
2015-08-13 18:29:07 +01:00
Thomas Harte
323aa27e13
Fixed: paging is based directly on the access, independent of the read/write line (since it isn't actually exposed to catridges).
2015-08-13 15:04:30 +01:00
Thomas Harte
59c872ada6
Attempted to reintroduce suitably noted emergency flyback. To re-enable auto-selection of PAL.
2015-08-13 14:55:53 +01:00
Thomas Harte
9838e01cc1
Made a first attempt at paging.
2015-08-13 13:24:02 +01:00
Thomas Harte
9ca57b80a7
Minor steps to help with diagnostics; all commented out or merely to benefit with breakpoint placement.
2015-08-13 08:43:10 +01:00
Thomas Harte
cc98534f94
Added test for NOP, discovering the undocumented ones to be the incorrect length.
2015-08-13 07:32:50 +01:00
Thomas Harte
6616265d93
Fixed collision tests, added a few more timing tests.
2015-08-13 03:33:45 +01:00
Thomas Harte
dd0f17130a
Found and fixed some timing errors in absolute indexed and in (indirect), y addressing modes: neither is able in write or read-modify-write modes to shave a cycle as then can when reading.
2015-08-13 02:58:39 +01:00
Thomas Harte
975836c30f
Added a quick snippet test, discovering that I've cut a cycle from read/modify/writes.
2015-08-13 02:18:41 +01:00
Thomas Harte
503d684af0
Added a couple of timing tests, both of which seem to pass for now.
2015-08-13 01:55:23 +01:00
Thomas Harte
e8f70398c1
Added one basic timing test, for now: implied nop should be two cycles.
2015-08-13 01:06:56 +01:00
Thomas Harte
d19f8ed507
Removed the implicit reset upon 6502 startup, adding a reset line. Hence all tests now pass again. Added an empty shell for timing tests, the all-RAM 6502 now counting bus cycles.
2015-08-13 00:51:06 +01:00
Thomas Harte
687816d470
Made some attempted simplifications, implemented collisions.
2015-08-13 00:31:57 +01:00
Thomas Harte
aebf636528
Ensured the PIA timer resumes its normal tick rate after being read; fixed those spaces that had crept in where tabs should be.
2015-08-10 16:55:16 +01:00
