| --- Log opened Sun Aug 03 00:00:35 2014 |
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| 01:42 | <&McMartin> | Oof. Always kind of disheartening when Java is transparently the best tool for the job. |
| 01:44 | <~Vornicus> | :( |
| 01:44 | <~Vornicus> | What's the job? |
| 01:51 | <&ToxicFrog> | Java, or the JVM? |
| 02:12 | <&McMartin> | In this case, Java, because Clojure's treatment of raw arrays is garbage. |
| 02:12 | <&McMartin> | javax.imageio is great but very array-heavy |
| 02:13 | | * McMartin is breaking up a monochrome PNG into a C64 bitmap, |
| 02:14 | <&McMartin> | Except instead of hacking like I was supposed to I just went and solved a bunch of DROD levels. |
| 02:20 | <~Vornicus> | My brother calls it "swordmangame" |
| 02:20 | <&ToxicFrog> | McMartin: I would say "Scala then" but I honestly have no idea what Scala's array handling is like |
| 02:21 | | * McMartin adds JtRH 23L1N2W to his list of amazing levels. |
| 02:21 | <&McMartin> | TF: Yeah, but this is also a problem where C would be a natural choice except for the "I have a PNG, give me an array" part. |
| 02:22 | <&McMartin> | And the resulting code will look like that, being a single class with two methods, both static. |
| 02:22 | <&McMartin> | I think I'll have dinner before actually writing the code though. |
| 02:30 | <~Vornicus> | I'd have picked Python with Pillow, personally |
| 02:31 | <&McMartin> | Sure, there are plenty of libraries out there |
| 02:31 | <&McMartin> | But when it's two lines of Java with no additional dependencies that's about as good as you can get (one to load it, one to extract a subrectangle as an array) |
| 02:32 | <&McMartin> | The rest of the code is basically the same in all ALGOL-oids, and that's the preferable one here, hence why I'm not using Clojure. |
| 02:32 | <&Derakon> | ImageMagick to convert the PNG into an easily-parseable text file, Perl to parse the file and output the desired result, then ImageMagick to convert it back to PNG~ |
| 02:32 | <&McMartin> | For building spritesheets and stuff it is in fact *all* closure. |
| 02:32 | <&McMartin> | Derakon: The desired end result is an assembler data block~ |
| 02:32 | <&Derakon> | Perl can output that! |
| 02:33 | <&McMartin> | It can! |
| 02:33 | <&McMartin> | There's a lossless PNG-to-text format thing out there, too |
| 02:33 | <&McMartin> | Still more work than load("filename").getRGB(x, y, w, h, stride) |
| 02:35 | <&McMartin> | Also, I don't like my logo~ |
| 02:35 | <&McMartin> | But it will do for a proof of concept. |
| 02:35 | <&Derakon> | What are you doing, generating DROD maps? |
| 02:35 | <&Derakon> | Oh wait, you said C64. |
| 02:35 | <&McMartin> | No, this is the C64 game I've been working on on-and-off |
| 02:35 | <&Derakon> | Porting DROD to said platform? |
| 02:35 | <&McMartin> | I'm working on the title screen. |
| 02:36 | <&Derakon> | Use the FLEET launch screen you made~ |
| 02:36 | <&McMartin> | No, I have a very specific plan. |
| 02:36 | <&McMartin> | (viz, run an attract mode underneath the title, rendered as a bunch of sprites that are enough to form a banner across the whole screen) |
| 02:36 | <&McMartin> | (That gives me a 152x21 workspace, which I just rendered some text to to start with and then gave Gradius wings) |
| 02:37 | <&McMartin> | This is Coreflight, which was originally codenamed Zappy Bird. |
| 02:37 | <&Derakon> | Hee. |
| 02:38 | <&McMartin> | And it's not like tunnel racers are some new strange thing. I just want to add a "shoot stuff" element to one. |
| 02:38 | <&McMartin> | But the real thing here is "I want to be able to use Game Maker's sprite editor as a C64 sprite editor" |
| 02:39 | <&McMartin> | And I think I can do that in under 30 lines of Java code, so~ |
| 02:40 | <&McMartin> | But, now, dinner |
| 02:40 | <&McMartin> | Then DVD on the desktop while hacking on the laptop |
| 02:40 | <&McMartin> | And then probably more JtRH |
| 02:40 | <&McMartin> | It's not inconceivable that I might manage to win the game this weekend, which would be great |
| 02:43 | <~Vornicus> | And then it's potentially on to The City Beneath, which is a little harder to name levels on~ |
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| 03:28 | <&McMartin> | Heh |
| 03:29 | <&McMartin> | Definitely taking a break after JtRH to play other things |
| 03:29 | <&McMartin> | And I'm not sure if I want to do TCB as the next DROD or GatEB. |
| 03:29 | <~Vornicus> | (tcb is also Crazy Hard) |
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| 04:17 | <&McMartin> | 55 lines with error-checking. Time to add the compositor part. |
| 04:22 | <&McMartin> | Oops, OK, a little more logic here so I can convert images that aren't multiples of 24x21. |
| 04:28 | <&McMartin> | Success! |
| 04:28 | <&McMartin> | OK, it was 75 lines, not 50. |
| 04:29 | <&McMartin> | Looking promising. |
| 04:30 | < Harlow> | mcmartin what does this script do? |
| 04:30 | <&McMartin> | I give it a PNG. It turns that PNG into monochrome by treating all pixels with alpha >= 0x80 to solid and the rest as transparent |
| 04:31 | <&McMartin> | It then breaks it into 24x21 chunks and encodes them as row-major bitmaps, with a 0 at the end so each chunk is 64 bytes long |
| 04:31 | <&McMartin> | It then formats it as a series of .byte directives for an assembler. |
| 04:31 | <&McMartin> | So, what it does is takes a monochrome PNG, possibly anti-aliased, and turns it into data suitable for feeding to Commodore 64 hardware sprites. :D |
| 04:31 | < Harlow> | lol |
| 04:32 | <&McMartin> | And so this, more importantly, means I can now use any old paint program to do 8-bit spritework. |
| 04:32 | <~Vornicus> | might I recommend in the absence of alpha channel, using greyscale values instead |
| 04:33 | <&McMartin> | Well |
| 04:33 | <&McMartin> | I get to have alpha channel, so~ |
| 04:33 | <&McMartin> | It would be *quite a bit* more work to try to handle color right. |
| 04:34 | <&McMartin> | Since I wrote this because I had one very specific image I wanted to create, I'm keeping it minimal for now. |
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| 04:45 | <&McMartin> | Man, 8-bit assembly programming. |
| 04:45 | <&McMartin> | "Well, I could compute where I want to put all these sprites" |
| 04:45 | <&McMartin> | "Or I could precompute it all and just produce an array that I blit directly into the video chip's register bank" |
| 04:49 | <&McMartin> | http://pastebin.starforge.co.uk/646 |
| 05:08 | < Harlow> | java! |
| 05:09 | < Harlow> | McMartin: are you just working in java because its easier to program in or is there another reason? |
| 05:39 | <&McMartin> | Basically, because javax.imageio has exactly the functions I need to do this one thing. |
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| 06:08 | < Harlow> | ah |
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| 07:34 | <&McMartin> | OK, I definitely need a better logo, but the logo code totally works. |
| 07:46 | <&McMartin> | https://dl.dropboxusercontent.com/u/63644917/mapgen.prg |
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| 18:02 | <@Tarinaky> | Python: recommendations for a library for packing/unpacking data from text files (format is unimportant, but ideally not XML). |
| 18:02 | <@Tarinaky> | Pickle has arbitary code-execution issues. |
| 18:02 | <@Tarinaky> | So I'd like something less... intelligent... |
| 18:36 | <&ToxicFrog> | JSON? |
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| 19:25 | <&jerith> | Tarinaky: JSON is in stdlib, but has all the limitations of JSON. |
| 19:27 | <&jerith> | YAML is somewhat nicer if you want stuff to be human-readable, but you need to use the safe versions of PyYAML's methods. |
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| 21:43 | <@Tarinaky> | jerith: 'safe'? |
| 21:43 | <@Tarinaky> | ToxicFrog: That's a file format, not a library. |
| 21:44 | <&jerith> | Tarinaky: YAML supports serialising arbitrary objects (although that's less interoperable) and does so by default. |
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| 22:49 | <&ToxicFrog> | Tamber: I assume that Python has a variety of effective JSON libraries. |
| 22:50 | | * Tamber waves at Tarinaky, dispatches that reply to. |
| 22:51 | <@Tarinaky> | ToxicFrog: I'm struggling to find them without knowing their name. |
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| 23:03 | <&jeroud> | Tarinaky: "json" in the stdlib. |
| 23:04 | <@Tarinaky> | okay |
| 23:04 | <&jeroud> | There's also "simplejson" if you need support for Python older than 2.6, but the author values performance over correctness. |
| 23:06 | <&jeroud> | (stdlib json is a slightly modified copy of simplejson that doesn't sometimes return bytes instead of unicode because of zOMGFAST!) |
| 23:06 | <&jeroud> | (Yes, I am somewhat bitter about that particular misfeature of simplejson.) |
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| --- Log closed Mon Aug 04 00:00:51 2014 |