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Commit Graph

64 Commits

Author SHA1 Message Date
Thomas Harte
82dbdf7dfc Switches to using regular linear interpolation for supersampling. 2020-09-14 22:36:00 -04:00
Thomas Harte
d7972a7b86 Enforces across-the-board supersampling. 
I'm damned if I can figure out how to talk an MTKView, or Metal in general, into supersampling so as a first effort this does it in software.
 2020-09-13 19:30:26 -04:00
Thomas Harte
bcaceff378 Simplifies in-Metal transform logic, loading responsibility for setup onto the CPU. 
I think I've also finally excised whatever order-of-operations issue I was having with regard to non-4:3 displays.
 2020-09-10 20:32:58 -04:00
Thomas Harte
edf8cf4dc6 Completes the set of with/without gamma, and ensures correct alpha selection. 
Also culls some other repetitive TODOs.
 2020-09-09 19:28:38 -04:00
Thomas Harte
dfcc8e9822 Switches some of the interpolated fields to half precision. 2020-09-09 18:17:05 -04:00
Thomas Harte
016e96e6f8 Extends usage of half. Possibly towards its conclusion. 2020-09-09 15:10:19 -04:00
Thomas Harte
e7ce03c418 Attempts to ensure initial finalised line texture state. 
This was an attempt to remove the vertical line on the left of a composite display. Obviously the cause is not as suspected.
 2020-09-09 13:15:21 -04:00
Thomas Harte
3d392dd81d Completes conversion of composite & S-Video per-pixel processing to 16-bit floats. 2020-09-09 13:02:04 -04:00
Thomas Harte
42d810db7f Switches per-pixel uniforms to halfs. 2020-09-09 10:53:09 -04:00
Thomas Harte
dda1649ab7 Introduces smaller luma kernel functions where useable. 2020-09-08 19:55:37 -04:00
Thomas Harte
c82e0df071 Starts a transition towards half-precision arithmetic. 2020-09-08 19:37:36 -04:00
Thomas Harte
06b7ea5a6e Strips the luma kernel back to 1d. 2020-09-08 19:15:19 -04:00
Thomas Harte
0e44d6d214 Experiments with an all-box filter. 2020-09-08 16:19:08 -04:00
Thomas Harte
de6ed7b615 Corrects phase-linked luminance support. 2020-09-07 20:53:28 -04:00
Thomas Harte
07dcb4dbb1 Starts reintroducing brightness, gamma and transparency for composite and S-Video pipelines. 2020-09-07 18:19:13 -04:00
Thomas Harte
e99896eadc At least nominates alpha, gamma and brightness to metal. 2020-09-04 16:07:58 -04:00
Thomas Harte
74d0acdaec Fixes non-RGB colour composite generation. 
The hard-coded sharpen filter proves to be a really bad fit for the Apple II though.
 2020-09-03 19:04:17 -04:00
Thomas Harte
0288a1974b Tries: separate filters for chroma and luma, plus a post-separation sharpen filter on the latter. 2020-09-03 13:18:21 -04:00
Thomas Harte
8bab9d5d60 Corrects S-Video and composite generation for RGB[1/2/4] sources. 
Also toys with a double luminance filter in order to try to sharpen chrominance. But maybe I should be looking at other convolutions entirely?
 2020-09-02 19:13:54 -04:00
Thomas Harte
7e58648743 Corrects front-running bug, plays further with colour amplitude. 2020-09-02 15:51:48 -04:00
Thomas Harte
0f0c3e616d Tweaks some numbers. 
I'm largely treading water here. Probably time to think about the race.
 2020-09-02 08:17:01 -04:00
Thomas Harte
c7ce65ea4c Attempts fully to restore composite video. 
Subject to some sort of nasty race condition for the time being.
 2020-09-02 08:03:10 -04:00
Thomas Harte
15296e43a4 Attempts correctly to set up the CPU side of a composite video pipeline, at least. 
So: I think this is really close, but I'm out of time for the day.
 2020-09-01 21:58:33 -04:00
Thomas Harte
f2929230a2 [Experimentally] introduces blending between computed S-Video fragments. 2020-09-01 21:37:36 -04:00
Thomas Harte
9e2bf2af7e Restricts S-Video processing to updated lines. 2020-09-01 21:27:40 -04:00
Thomas Harte
245f2654f0 Shifts S-Video processing into the compute shader. 2020-09-01 20:37:11 -04:00
Thomas Harte
67ca298a72 Forces a no-op compute shader into the S-Video pipeline. 
The intention is to restrict the area acted over, and to do the S-Video filtering in there. Then I'll just need two such stages for composite.
 2020-09-01 18:39:52 -04:00
Thomas Harte
1e1f007bb7 Possibly convinces myself that no-separation chroma/luma isn't practical. 
... as appealing as it may be, were filters perfect.
 2020-08-29 21:25:49 -04:00
Thomas Harte
c40d858f02 Switches back to angular stuff at input resolution; ensures all S-Video modes work. 
Now to roll back onto composite. Fingers crossed!
 2020-08-29 20:54:46 -04:00
Thomas Harte
3d564d85fd Proves that per-pixel sine/cos evaluation avoids phase issues. 
Even in PAL mode. But I'd rather not _require_ this as it kind of negates directly-sampled input.
 2020-08-29 18:53:37 -04:00
Thomas Harte
02cea40ffa Attempts to avoid introducing phase error in scanToComposition. 
Also brightens S-Video up to RGB levels.
 2020-08-25 22:41:37 -04:00
Thomas Harte
e502d336db Having decided that these things probably need to be separate, starts drilling down on S-Video. 2020-08-25 22:05:19 -04:00
Thomas Harte
807cb99f6d Composite angles are signed. 2020-08-23 21:39:04 -04:00
Thomas Harte
7ca0362f23 Treads water. 
Difficult current question: why does the Atari 2600's display change colours as the display tries to achieve horizontal lock? Phase should be unchanged. Ergo something is amiss.
 2020-08-23 21:03:26 -04:00
Thomas Harte
56c7bd242a Marginally tidies. 2020-08-22 16:38:36 -04:00
Thomas Harte
bf6a0c9fc4 Achieves a return of composite colour for RGB-producing machines. 2020-08-21 22:06:36 -04:00
Thomas Harte
d54b937ab6 Starts trying to do actual composite processing. 2020-08-21 21:11:25 -04:00
Thomas Harte
7c23c32e44 Corrects composition colour phase. 2020-08-20 20:45:45 -04:00
Thomas Harte
4e21d24b5f Corrects composition colour amplitude. 2020-08-20 20:34:37 -04:00
Thomas Harte
ad6fb85fda Corrects use of composition buffer. 
Something is still very obviously amiss in colour processing somewhere down the line, but the correct forms are once again visibly in evidence.
 2020-08-20 20:21:28 -04:00
Thomas Harte
3597f687de Continues sidling towards composite & S-Video handling. 2020-08-19 21:20:06 -04:00
Thomas Harte
8811506adf Starts towards building a compound[/composition?] buffer. 
I now need to discover whether I can use natural integer texture coordinates.
 2020-08-17 22:10:02 -04:00
Thomas Harte
59c4c8233f Generalises existing scanToDisplay to add lineToDisplay. 2020-08-17 21:15:19 -04:00
Thomas Harte
9da79d2d81 Clarifies scaling logic. 2020-08-17 20:29:46 -04:00
Thomas Harte
27e8a3a1b5 Obeys modals' zoom. 
Subject to an attempt at factoring aspect ratio differences.
 2020-08-16 21:11:43 -04:00
Thomas Harte
745797b596 Introduces a stencil buffer plus the inter-frame clearing it allows. 2020-08-16 16:42:32 -04:00
Thomas Harte
940e9e037e Adds first_scan to LineMetadata. 
Also reorders `Line` fields to match `Scan` fields, just for visual consistency.
 2020-08-16 08:59:37 -04:00
Thomas Harte
645c29f853 Adds an intermediate buffer to correct inter-frame smoothing. 
Also goes someway back to the old scan output scheduling, albeit presently with limited thread safety.
 2020-08-15 21:24:10 -04:00
Thomas Harte
27ca782cac Enables blending; attempts to enable frame preservation. 
The latter seems to be evidencing a double buffer at play. More investigation required.

On the plus side, the direct route is still well within GPU budget at 4k on my Core M. So a huge improvement there.
 2020-08-12 19:34:07 -04:00
Thomas Harte
a136a00a2f Takes a shot at adding RGB -> S-Video and composite conversion, for all RGB types. 2020-08-11 22:11:50 -04:00