Thomas Harte
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3ab6585789
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Started making the format of data included in a CRTFrame less a matter of variously hard-coded magic constants. Which will allow me to separate the idea of an internal lateral position from the direct texture coordinate, avoiding precision sampling errors at the top and bottom.
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2015-08-02 14:25:21 -04:00 |
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Thomas Harte
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be421587ad
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Eliminated the vertical retrace counter; vertical retrace ends when the beam gets back to the top.
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2015-08-02 13:48:35 -04:00 |
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Thomas Harte
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9c91f1a2eb
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Added an attempt at NTSC/PAL autodetection, based on number of missed vertical syncs.
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2015-07-31 18:04:33 -04:00 |
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Thomas Harte
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a5d66e9dd6
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Factored out a few more constants, started trying to ensure there's enough slack and the mechanisms in place for the CathodeRayView to hold onto two frames if it desires, for potential phosphor simulation, switched once again to additive blending — much more like a real CRT — and added a sine function across the width of spans per my understanding of how an electron gun actually fires.
Why do all this when overall timing is still so far off? It helps me more easily see how overall timing is so far off.
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2015-07-31 17:47:10 -04:00 |
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Thomas Harte
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53dd5c8f16
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Trying to fix my RDY line emulation. Switched to PAL timings, at least temporarily, since it's starting to make a difference.
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2015-07-31 16:44:53 -04:00 |
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Thomas Harte
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e4615cda2e
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Switched back to unrealistic solid raster beams for the time being.
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2015-07-30 23:01:59 -04:00 |
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Thomas Harte
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cfe758daa0
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A tweak here, a tweak there, to help with debugging.
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2015-07-30 21:29:40 -04:00 |
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Thomas Harte
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20c2d98b9a
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Converted remaining spaces to real tabs.
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2015-07-30 20:51:32 -04:00 |
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Thomas Harte
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98efae2536
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Reintroduced emergency vertical sync — so that output occurs even when the emulation isn't catching syncs properly — and switched some spaces to tabs.
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2015-07-30 17:16:49 -04:00 |
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Thomas Harte
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828ae66a45
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It appears ARC extends its reach into C++ nowadays. Fixed additional retain cycle.
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2015-07-27 21:17:53 -04:00 |
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Thomas Harte
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3c25ead1f3
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Started working out some of my retain cycles and general failures to release. Switched .mm filename so that Xcode will stop getting confused when I try to switch between implementation and interface files.
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2015-07-27 21:15:10 -04:00 |
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Thomas Harte
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1cbebdafcc
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This now uploads only a portion of the source buffer if possible. Which is usually possible.
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2015-07-27 20:58:51 -04:00 |
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Thomas Harte
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1f229ee6f7
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More tweaks to provide a stable image, at least for the time being.
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2015-07-27 20:18:25 -04:00 |
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Thomas Harte
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01109d441b
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Made an attempt at NTSC colours. Hard coded in RGB, not composite. Short cuts, tsk.
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2015-07-27 19:04:03 -04:00 |
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Thomas Harte
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662e7942ac
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Enabled multisampling. This is hardly an expensive use case.
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2015-07-27 16:57:11 -04:00 |
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Thomas Harte
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b9cf6fd4dc
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Implemented a virtual skew control, hard coded to what is conveniently exactly the right number.
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2015-07-27 16:44:47 -04:00 |
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Thomas Harte
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caffe56a2d
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Slightly expanded width of cathode ray gun, decided to figure out exactly how to deal with off-by-one lengths and precision at a later date, ensured that failure to catch vertical sync doesn't cause out-of-bounds buffer access on the hard-coded, assumed large enough, 512x512 data textures.
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2015-07-27 00:28:47 -04:00 |
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Thomas Harte
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65bb31d55b
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With around about a thousand issues, not the least of which being sometimes unsafe memory accesses, I've at last got pixels on screen.
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2015-07-26 23:50:43 -04:00 |
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Thomas Harte
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cd0a62d21e
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With a slight tweak to the informal protocol used for 6502 memory access cycles, ensured the wait strobe actually halts the CPU, to give a more accurate linking of machine time to real time.
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2015-07-26 15:55:19 -04:00 |
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Thomas Harte
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6252f6030f
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Switched to idiomatic source name, ensured latest project name is in all appropriate header places, threw texture coordinates slightly into the shader mix.
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2015-07-26 15:25:11 -04:00 |
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Thomas Harte
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e53fbcf9ea
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Reshuffled to make the OpenGL view explicitly a conduit for CRT-style output, and to give it responsibility for frame drawing. Which is still an awkward thread hop for the time being, but I've yet to read up on the advocated approach to multithreading with an NSOpenGLView; it looked like special provisions were available.
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2015-07-26 15:13:46 -04:00 |
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Thomas Harte
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78a91b67c5
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Quickie: make sure the correct context is adjusted; use the intended convertPointToBacking:.
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2015-07-24 23:42:19 -04:00 |
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Thomas Harte
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ecb2898bd5
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The overall architecture of who has responsibility for what is now very askew but: the CRT now outputs a tightly packed short buffer, with the probable OpenGL destination in mind. So it's now all fixed arithmetic internally. CRTFrame is reduced to a plain C struct with the intention that the OpenGL view will take responsibility for it and stop doing the back-and-forth sprint on getting buffer data. The Atari 2600 now outputs explicit blanks rather than level blacks for its border, so that it's easier visually to debug the CRT in its form as far as it has currently progressed: to drawing lines where the cathode ray gun would run while outputting pixel. I note that I'm still not quite getting vertical sync right yet — I'm just accepting it anywhere in teh frame — but that should be an easy fix.
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2015-07-24 23:29:45 -04:00 |
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Thomas Harte
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5ab47e600a
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Got through the requisite amount of invisible pain to get something onto my GL display. But clearly this is factored in entirely the wrong way. Work to do.
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2015-07-24 20:37:08 -04:00 |
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Thomas Harte
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31338ef754
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Okay; having no minimum size is a user experience nightmare. Fixed.
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2015-07-23 22:54:17 -04:00 |
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Thomas Harte
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44e8ffd01c
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Ensured windows start and remain 4:3, made sure I request a GL 3.2 context and that an exception is raised if I call any old-fashioned GL functions.
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2015-07-23 22:51:53 -04:00 |
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Thomas Harte
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02c786520a
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More fiddling in the margins in advance of doing the OpenGL stuff: window now supports full-screen display.
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2015-07-23 20:53:26 -04:00 |
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Thomas Harte
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b9721d1d3f
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Okay, treading water slightly, ensured window content is correct aspect ratio.
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2015-07-23 20:50:50 -04:00 |
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Thomas Harte
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7276c77027
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A full communication pathway now leads to Atari2600.mm (for now) being in possession of a frame and receiving a command to draw, with a suitable OpenGL context being active and whatever is drawn subsequently appearing.
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2015-07-23 20:45:07 -04:00 |
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Thomas Harte
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0611646181
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This then is what the serial dispatch queue and the triple buffer achieve together: I can post the runs over to the main thread for processing while emulation continues separately.
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2015-07-23 20:16:48 -04:00 |
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Thomas Harte
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e7237c7bd5
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Switched to forcing all processing onto a common queue and piping the completed frame over into the Objective-C class.
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2015-07-23 20:07:35 -04:00 |
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Thomas Harte
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5203f31bf4
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Reintroduced a console examination of the output runs being received after fixing a failure to complete or restart frames over in the CRT; weirdly it seems that sync is being obeyed but raster position is off. So work to do.
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2015-07-22 20:45:10 -04:00 |
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Thomas Harte
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065050115f
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Made an attempt to switch to a triple-buffering scheme for CRT outputs, with an eye towards asynchronicity.
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2015-07-22 20:33:20 -04:00 |
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Thomas Harte
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963cb2f6fb
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Attempted to switch to slightly more meaningful names within the CRT and implemented a delegate to investigate output. Working on it.
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2015-07-22 18:15:18 -04:00 |
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Thomas Harte
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2d0f861474
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Incoming: a 'CRT' class, to receive information intended for a cathode ray tube. To decode sync, etc.
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2015-07-19 13:36:27 -04:00 |
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Thomas Harte
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12746b35e3
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Ensured there's no overflow while changing base.
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2015-07-19 10:54:19 -04:00 |
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Thomas Harte
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412e02fdd8
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Merge branch 'master' of github.com:TomHarte/CLK
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2015-07-19 10:52:15 -04:00 |
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Thomas Harte
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e0aa1e9f19
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Minor project rearrangement to aid findability.
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2015-07-17 09:10:23 -04:00 |
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Thomas Harte
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195c8a87d8
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Introduced enough logic that the Atari 2600 is being run, at least. No output yet though because (i) it has no-one to send output to; and (ii) there's nobody that knows how to display output. Hmmm.
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2015-07-16 22:14:40 -04:00 |
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Thomas Harte
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4496493e85
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Performed the bare necessary steps to get my little OpenGL view to create a CVDisplayLink and then repaint itself in time with the display.
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2015-07-16 21:16:21 -04:00 |
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Thomas Harte
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1df2c48668
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Introduced my GL view as the window content.
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2015-07-16 21:01:49 -04:00 |
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Thomas Harte
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5160b6bbb8
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Separated out different test suites into different XCTest subclasses.
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2015-07-16 20:52:16 -04:00 |
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Thomas Harte
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3e0679235a
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This now goes just far enough to create an instance of Atari2600::Machine and push a ROM to it. Next jobs are to get a basic CRT emulation wired up, outputting to the window.
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2015-07-16 20:40:46 -04:00 |
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Thomas Harte
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24c0579b94
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Shuffled things and guessed at things until the Xcode project was happy being subservient to the project proper.
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2015-07-16 20:27:31 -04:00 |
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