| --- Log opened Sun Jan 17 00:00:13 2016 |
| 00:05 | | * VV finds himself pondering a solver for Flow aka Numberlink |
| 00:41 | <@VV> | things I know I can use: 1. normal cells have exactly two paths exiting, endpoint cells have exactly one; 2. cells adjacent to the same flow twice have walls in both of those directions; 3. "paired" flows in adjacent cells will have a path between, to complete the flow |
| 00:44 | <@Alek> | if I'm thinking of the same Flow I think you are, then one caveat is that every cell has to have a path in it, but a: the most efficient pathing won't fill every cell necessarily, and b: for those cases, there's usually more than one way to fill the extra cells. |
| 00:46 | <@VV> | yeah, which is very annoying |
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| 05:55 | <&McMartin> | VV: Finished that program I discussed last night. |
| 05:55 | <&McMartin> | https://hkn.eecs.berkeley.edu/~mcmartin/retro/sprdma.prg |
| 05:56 | <@VV> | That's almost pronounceable |
| 05:56 | <&McMartin> | It took me quite a few tries to correctly pronounce "victimer" |
| 05:56 | <&McMartin> | It doesn't involving making victims of anything |
| 05:56 | <@VV> | ...also does it have a companion called btama.prg |
| 05:57 | | * McMartin did not get the joke there |
| 05:57 | <&McMartin> | "Sprite DMA" is what that is short for |
| 05:58 | <@VV> | I went from sprdma to spiderman to baman and piderman to batman to btama |
| 05:58 | <&McMartin> | Oh |
| 06:11 | <@VV> | so, sprites - how does the vic know when certain sprites are on the line? Does it pull in the data at vblank or something? |
| 06:11 | <&McMartin> | The VIC itself lives at $D000-$D3FF, as far as the CPU is concerned |
| 06:11 | <&McMartin> | So when it writes, say, $d001 to set sprite 0 y position |
| 06:12 | <&McMartin> | It's writing the VIC-II's own registers |
| 06:12 | <&McMartin> | So the VIC-II "just knows" where sprites are |
| 06:15 | <@VV> | Okay so we're actually mapping the vic's registers into memory, so it can do the math itself. |
| 06:15 | <@VV> | (for my next trick I have to look things up) |
| 06:16 | <&McMartin> | Right. The things the VIC has to load in are sprite graphics, char graphics, and color informatino |
| 06:16 | <&McMartin> | Color info actually comes in on a separate bus |
| 06:16 | <&McMartin> | which chars are on any given line also has to come in at the start of lines, and that's a badline |
| 06:16 | <@VV> | okay so then you have pointers to each sprite and the time the vic takes when doing DMA is specifically the time it takes to deref that pointer and pull the necessary line data |
| 06:16 | <&McMartin> | Right |
| 06:16 | <&McMartin> | Remember that the VIC gets the memory bus on half of every clock cycle (the half the CPU isn't using it) |
| 06:17 | <&McMartin> | When it has nothing better to do it uses that time to do DRAM refreshes |
| 06:17 | <&McMartin> | But usually it's loading the char graphics it needs Right Now |
| 06:18 | <@VV> | dram refreshes -- is this that bit where ram goes kind of stale after a while, so it reads it off and rewrites it so it's not stale? |
| 06:18 | <&McMartin> | Yeah. Way cheaper to manufacture that way, and it's what everything has used for ages now |
| 06:18 | <&McMartin> | I think you might simply just have to access it at all to top it up |
| 06:49 | <&McMartin> | Meanwhile, here are the values theory predicts |
| 06:49 | <&McMartin> | https://hkn.eecs.berkeley.edu/~mcmartin/retro/sprite_delay.c |
| 06:49 | <&McMartin> | https://hkn.eecs.berkeley.edu/~mcmartin/retro/sprite_delay.txt |
| 06:49 | <&McMartin> | Sorry. the .c file is what produced the .txt file. |
| 06:52 | <@VV> | of course |
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| 07:45 | <&McMartin> | Then the guy I was writing that for could make no sense of the C could but did just fine with https://hkn.eecs.berkeley.edu/~mcmartin/spr_delay_asm.txt which I find boggling |
| 08:00 | <@VV> | That is boggling |
| 08:06 | <@VV> | speaking of boggling: def sprdma(flags): return sum(map(int, list(('00' + bin(flags)[2:]).replace('001', '5').replace('01', '4').replace('1','2')))) |
| 08:06 | <@VV> | I do not know why this code occurred to me. |
| 08:09 | <&McMartin> | Because math |
| 08:11 | <@VV> | passes the test of matching your output, anyway. |
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| 08:15 | < Natanial> | ahhh |
| 08:15 | <@VV> | refreshment, enlightenment, or falling down a cliff? |
| 08:16 | < Natanial> | All three with a blissful attitude |
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| 08:18 | < Natanial_> | ahh connections |
| 08:20 | < Natanial_> | Not much I believe |
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| 08:22 | < Natanian> | Ohh for fuck sake |
| 08:23 | < Natanian> | I don't even know if it worka |
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| 08:24 | < Natanian> | Thank you |
| 08:25 | <@VV> | ?? |
| 08:26 | < Natanian> | My connection sometimes don't work |
| 08:26 | < Natanian> | VV |
| 08:27 | < Natanian> | love it. |
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| 22:05 | <&jerith> | I did a thing: https://github.com/jerith/chaocaml |
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| --- Log closed Mon Jan 18 00:00:29 2016 |