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Post AwfFehXdL6AdiqJepU by [email protected] |
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More posts by [email protected] |
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Post #AwfEdXy9LMYvn4bXU0 by [email protected] |
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I'm hacking on Solar Winds (DOS, 1993) again. I really don't understand… |
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Post #AwfEozMnouYdwqajqK by [email protected] |
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this game is about 1.1 megabytes, so maybe they just never bothered trying to s… |
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Post #AwfEtWoVPKgOq8iKXI by [email protected] |
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still, why waste 30kb? |
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Post #AwfFDLbYn7Ztrt6qUC by [email protected] |
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some of these strings are double delimited: both $ and NUL. Smells like a assem… |
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Post #AwfFJp2iFqZ4uDtgyu by [email protected] |
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anyway I am not 100% sure the two game scripts are identical. might be interest… |
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Post #AwfFehXdL6AdiqJepU by [email protected] |
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@foone have you tried if it works without the dat file present?my gut says mayb… |
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Post #AwfFehdeygzW1X8TDs by [email protected] |
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@0 it just crashes with a file-missing error if the dat file is missing, it doe… |
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Post #AwfG2pfqkpdjtXfLKi by [email protected] |
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@foone Have you ever looked at the DOS game 'Gods?' I love the music in… |
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Post #AwfJHssFRH2g1eKkjY by [email protected] |
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@FreakyFwoof @foone I've always thought it was regular mods, this being the… |
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Post #AwfKXznlY85C6CU3cm by [email protected] |
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the other interesting thing about solar winds that I discovered a while back: i… |
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Post #AwfNb5CEFUFhYr5coa by [email protected] |
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here's another bit of evidence that this program was written in assembly:it… |
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Post #AwfNdq7AmIoTeh2VAu by [email protected] |
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very un-c-like behavior |
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Post #AwfOUPfDqtUSy32DD6 by [email protected] |
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this may be the first game I've seen that reads the palette out of the VGA … |
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Post #AwfQ9ypW6tyFrOEbDM by [email protected] |
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@foone Solar Winds was written by James Schmalz who, I'm pretty sure, wrote… |
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Post #AwfQ9ywFhrMICHNyiG by [email protected] |
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@TomGwozdz yeah I'm planning to compare against silverball /epic pinball to… |
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Post #AwfQdb72r4uWzQYWR6 by [email protected] |
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all the DAT filenames are prefixed with BH_hypothesis: the original title for S… |
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Post #AwfQhb0DCsnno3GZDU by [email protected] |
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@foone I think Civ I also might, considering that its fade-out seems to be sens… |
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Post #AwfQyLSSFo9gWESmLg by [email protected] |
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@foone is it possible that they had the script built in but needed to change it… |
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Post #AwfR119kBxp4QGzBEO by [email protected] |
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@foone curious to see what you can find out if anything :neomouse_magnify: |
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Post #AwfRPJCIlahvKJlUIq by [email protected] |
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@foone my guess would be that the script was growing enough that they were worr… |
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Post #AwfRerqiDLp98o5N7w by [email protected] |
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@foone @0 Maybe they had originally planned to use the one embedded into the ex… |
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Post #AwfRlQKWvauhor9uyG by [email protected] |
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@maon @foone Oh wow, memories. It is. I was new to mods back then, so had no id… |
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Post #AwfS9daNIOSJsf7GYi by [email protected] |
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I think this game doesn't have a random number generatorinstead, every time… |
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Post #AwfT9i5yd29HozUq3M by [email protected] |
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@[email protected] so the game would be deterministic if your rtc were broken? |
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Post #AwfT9iC0GcyA7gJeRk by [email protected] |
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@tauon no, because DOS maintains the time while it's running. |
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Post #AwfTDPRrtojB9CV3T6 by [email protected] |
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@foone omg I remember that game slightly weirdly fondly! But as a kid I never … |
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Post #AwfTDPYxTSOnVBoiWG by [email protected] |
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@dan_ballard just general hacking because it's there. I don't think it … |
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Post #AwfTZFd15iAV3s84pM by [email protected] |
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@foone speedrun manipulation possibility detected |
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Post #AwfTZFk6fLq7PrRjsW by [email protected] |
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@pence I actually already did a speedrun for solar winds! the end goal of the g… |
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Post #AwfU6FtP84yTRBX3QW by [email protected] |
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okay I found the code that determines which sprite to use for NPC ships. I hard… |
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Post #AwfUMtUFgc3Es1hXV2 by [email protected] |
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*(wchar_t *)(u_00000000000000000000000000000000_1019_b9a0 + 100) = L'\0'… |
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Post #AwfVH64C6Ovw6PJRDs by [email protected] |
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oh hey hardcoding the ship to type 0 causes some WEIRD problems when you restar… |
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Post #AwfVWjUbncpEiw7iQS by [email protected] |
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@foone It knows you well. |
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Post #AwfVYxgQ0iGlJWi5zc by [email protected] |
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@[email protected] oh, i thought it was like the ps2 where it stopped working… |
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Post #AwfVYxnVaLwNfW1l2m by [email protected] |
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@tauon @[email protected] whats the button combo bc my ps2βs rtc battery is… |
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Post #AwfVYxub9zc01VLQ5w by [email protected] |
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@silly @[email protected] square and x i think |
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Post #AwfVaXql1qlllyIjiK by [email protected] |
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@foone I love this technique. Though you can improve it by multiplying by a lar… |
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Post #AwfVdq29sV6P2PCio4 by [email protected] |
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@foone Amazing! Sadly not RNG limited, then π |
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Post #AwfVi5RQXEaJyw37Cq by [email protected] |
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@foone somewhere out there there's a DSP chip that fits this exact descript… |
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Post #AwfVkuvc4xiGFEWC3M by [email protected] |
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@foone you might not be but i am |
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Post #AwfVwQQnIBJ58Paf8y by [email protected] |
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@foone ... I was going to ask if this was Tyrian, is there any relation? |
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Post #AwfVwQXsroyhUOuKC8 by [email protected] |
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@Mendie_Taoma I don't believe so. other than the music, this game was solel… |
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Post #AwfWHPn6rpBlEN2M3E by [email protected] |
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@gewt unsurprised |
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Post #AwfXJbMotn0PfNLYdU by [email protected] |
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guh. I'm staring confused at this palette fade, wondering why it's only… |
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Post #AwfYSBJFFYHxPVKUbY by [email protected] |
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okay I figured out where the fade-out and fade-in routines are and disabled the… |
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Post #AwfYZY5YxHsy5PRWE4 by [email protected] |
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anyway decoding this has given me a new perspective on a childhood bug: I playe… |
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Post #AwfYdfPZfgPRxJlbJw by [email protected] |
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it could also be the vsync. maybe it was waiting for a screen refresh signal th… |
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Post #AwfZb3qUT9igp2g5Sq by [email protected] |
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@foone I can see why most games wouldn't read the palette. Yes, you've … |
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Post #AwfaPXXEMK6ZNhjtzs by [email protected] |
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@gewt @foone Which architecture? 144bit sounds really unusual... |
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Post #AwfaPXdbybD1hUizwW by [email protected] |
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@vaporeon_ @foone im being technical and exaggering itanium specs |
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Post #AwfaQ3cJ4zBAsiMPLs by [email protected] |
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@foone OTOH, why not? |
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Post #Awfbi69WUS5Bue401Y by [email protected] |
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@foone this gave me a cursed idea: `double`-segmented architecture.Addresses ar… |
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Post #AwfcR2kNzwxiNkjmHA by [email protected] |
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@dgelessus AHHHHHH |
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Post #Awfcm082vcjOLInW08 by [email protected] |
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well I don't understand how to use the text drawing routine properly, but I… |
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Post #AwfcpT3XpjsavbLSKm by [email protected] |
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It seems to be embedding coordinates into a 16bit integer but not in a way that… |
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Post #AwfdRC2hXPzvAJwJFo by [email protected] |
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@foone oh wow I LOVED this game as a kid! I hadn't even thought about it in… |
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Post #AwfdjY48OZK8gJMWTw by [email protected] |
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@foone we used similar technique in C64 ;) |
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Post #AwfgvqqQhWpqGEVgau by [email protected] |
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okay I was misunderstanding, I think.it's just DI, the high byte being the … |
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Post #Awfh6LNY1xXrrB0JSS by [email protected] |
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yeah something fucky is going on: it render ONE VALUE with an X coord >255 |
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Post #Awfh9sEwJHmkdtf1we by [email protected] |
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BUT HOW? |
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Post #AwfhOrrM0TVbo3mKIa by [email protected] |
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@foone Only allow even-numbered x-coordinates? |
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Post #AwfiDKJsT0vaYLBH28 by [email protected] |
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@foone Drawing text starting that far right is unlikely. Maybe if it needs to s… |
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Post #AwfkXGgRtXT2yaNJB2 by [email protected] |
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@SvenGeier good theory, but nope. 0001 is one pixel to the right of 0000 |
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Post #Awfkbpukqk43OuFEGW by [email protected] |
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@foone Put the extra bit in the carry flag! |
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Post #AwfkirhMcCPsxdKgvQ by [email protected] |
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I love reverse engineering by breaking the code.I confirmed which function is d… |
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Post #AwflGrhF82rAnhUMOu by [email protected] |
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@foone the game also glitched out weirdly in cutscenes for me back in the day t… |
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Post #AwfnXm7BKmNqJwoQgy by [email protected] |
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ghidra, if you know this code is at 231e:0bbe and it's MOV BYTE PTR CS:[0x4… |
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Post #Awfnp01mrKegOUVCYi by [email protected] |
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and if I double click the 44, I end up at 00:44WRONG AGAIN, GHIDRA |
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Post #Awfnz4GDyayQPy3XhA by [email protected] |
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231e:0002? that's not... No! |
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Post #Awfq7NCddLBTOIT0T2 by [email protected] |
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the game stores the activation status for 39 missions.the game only has 17 miss… |
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Post #Awfrmt8du1S2GRxRHU by [email protected] |
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@fooneAn extra bit in that? 17x2=38 close to 39? |
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Post #Awg11rxdShyoXl1ljM by [email protected] |
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@fooneIt's been ages since I had to deal with x86 segmentation fuckery, but… |
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Post #AwgWKat4GMKrfhIdPM by [email protected] |
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@foone oh, ghidra does dos games - does it also do windows 3.1 games? I always … |
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Post #AwgWKb0rnMZe3swrZ2 by [email protected] |
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@Patashu it does, but it's not exactly the greatest at it. much like DOS pr… |
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Post #AwgWUSNgk8sIBbKDSq by [email protected] |
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@foone DLC? |
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Post #AwgWUSU4MPykVOJJPU by [email protected] |
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@AT1ST 1993!although it is shareware: you can pay to get the second half of the… |
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Post #AwjTrSv6qjvOfuS7Bw by [email protected] |
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got damn ghidra. I have a disassembly that shows CMP BYTE PTR [0x0], 0x1and a d… |
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Post #AwjTxCyH3nz8woffY8 by [email protected] |
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also yeah, fun segmented memory thing. NULL is a valid memory address and here … |
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Post #AwjUn99GWC2q9MZujI by [email protected] |
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*puVar4 = *puVar4;NO |
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Post #AwjUrgDZVbSFs5koxE by [email protected] |
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the matching disassembly:MOV AH, byte ptr [DI]MOV byte ptr ES:[DI], AHDO YOU KN… |
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Post #AwjWfqF6bwcvObxEno by [email protected] |
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@[email protected] I've had it give similarly crazy results for a piece o… |
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Post #AwjZNztIIg7ty9w2IS by [email protected] |
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@foone youβre sure that is a tool, and not a game posing as a tool? |
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Post #AwjbvBwSiPYyoGNBJo by [email protected] |
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found the cheat code (it's well known (it's in the MANUAL), but I hadn&… |
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Post #Awjh5hR0yq0F9KUfE8 by [email protected] |
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@asie ouch. segment-spanning functions are not something I've had to deal w… |
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Post #AwjktwPLssfDvhMeeG by [email protected] |
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found a copy-paste bug! the code that draws these three red dots miscolors the … |
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Post #AwjlMBHQBRjYAA7Xt2 by [email protected] |
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the code looks like:MOV AL, 0x34MOV byte ptr ES:[button_offset + 0xa07 ],ALM… |
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Post #AwjnJpbO0j1oG7Sz68 by [email protected] |
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so if your gun is on 1-laser mode, it fires every 13-somethings (frames?)with i… |
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Post #AwjnP19sTKLnY34YvQ by [email protected] |
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yeah it's frames. at least logic frames, I don't think this game unhook… |
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Post #AwjvYYD7kjPSIWeDz6 by [email protected] |
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huh! this game doesn't implement highlighted text by the usual way of just … |
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Post #AwjwKWIcA8tsGm5bRA by [email protected] |
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POP AHPUSH AHPOP AHIN OR OUT, MAKE UP YOUR MIND! |
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Post #AwjwObUOo9efWaY5Qm by [email protected] |
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@foone this code is a cat |
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Post #Awjwj3lFP6YV02BRjc by [email protected] |
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@foone average 00βs song lyrics |
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Post #Awjx2dd4GtLlkDh3Wy by [email protected] |
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@foone You do the hokey pokey and decompile around.That's what it's all… |
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Post #AwjxYNgf4xZlZGViMK by [email protected] |
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@foone "i write my assembly in a boston accent" |
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Post #Awjxgg8QNHC36DS8zg by [email protected] |
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@foone I'm @Mandy_babie on #Mastodon! Come follow me at https://mastodon.xy… |
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Post #Awjy35ixukk4pmERI8 by [email protected] |
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@foone Followed by the little-known but vital HKY and CKY instructions, which a… |
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Post #Awk49Zwp3Yug27Bqmu by [email protected] |
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so I went and beat the game while having a breakpoint on a function that tells … |
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Post #Awlc5Ck6yuKEVOI4Dw by [email protected] |
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why write bool is_joystick_button_down(int button) when you can instead write t… |
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Post #Awlc9vhlkrXz6yRpke by [email protected] |
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I know programmers who don't use copy paste and they're all cowards |
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Post #AwlcCa94MypZ78Tx4a by [email protected] |
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@foone, do they, by any chance, each call is_joystick_button_down() with an app… |
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Post #AwlcTSqqk1MjPp0gXA by [email protected] |
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@lp0_on_fire nope. no parameters. this code actually very rarely uses parameter… |
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Post #AwlccIDndFk13OxEkS by [email protected] |
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the only difference between the code is if it ANDs the result against 0x10 (but… |
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Post #Awlcf8bdq3OA6JSlLU by [email protected] |
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years ago I asked for the source for this game in the hopes of building a moder… |
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Post #Awldybjlr06huD74ls by [email protected] |
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this code does the following:sets joy_left to falsesets joy_right to falsereads… |
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Post #Awle4klND0lxdVnEfI by [email protected] |
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@foone itβs like a little dance. |
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Post #Awle7lEBwALHwkhsPI by [email protected] |
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this is in the function read_joystick_analog_x, which is the same as read_joyst… |
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Post #AwlekXqFdlCXix0DUO by [email protected] |
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@foone wild guess, they just thought copy_pasting the function would've bee… |
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Post #AwlfNduJ1Uk7pTXgLQ by [email protected] |
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@foone switch (button) { default: return false; case 1: return is_joystic… |
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Post #Awlgg4MNVjnB2P1VKa by [email protected] |
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@foone perhaps because of a lack of well-defined calling conventions, making re… |
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Post #AwlgnVAcEHIkDQ47V2 by [email protected] |
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@foone I wish having "joy left" set to "false" wasn't s… |
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Post #AwliCg6wmwvJLEv0gS by [email protected] |
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@foone That sounds suspiciously like something I'd do to work around some d… |
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Post #AwlnVedmyk8k3R9EY4 by [email protected] |
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@foone premature optimization is the root of all evil.There's also some kin… |
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Post #AwlnXroqx7ORVQNVJY by [email protected] |
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@eniko Now do that with a linked list of function pointers instead. π@foone |
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Post #AwlndGExaCjWh7A4NU by [email protected] |
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@foone its a whole int! youre gunna look pretty silly copying and pasting when … |
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Post #AwlnhNUMZjZSKjKTI0 by [email protected] |
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@foone just call it "monomorphization" and now it's a feature! |
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Post #AwlniaskGUdcA4JVCq by [email protected] |
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@eniko @foone god I hate C |
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Post #AwlnibnSrc0Yzyqnc8 by [email protected] |
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@eniko @foone oh, I misremembered how default works and for some reason thought… |
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Post #AwlzBa75IjGbff2t28 by [email protected] |
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@foone Wait - isn't this the correct way to read DOS analog joysticks? You … |
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Post #Awm96minzkkUrw2aGW by [email protected] |
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@eniko @foone I'm sure people will tell you that three IF statements would … |
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Post #Awm99nvhxZBLU6W1q4 by [email protected] |
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@foone Because is_joystick_button_down(1) breaks the "no magic numbers&quo… |
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Post #AwmCigeBKPUYtaduMa by [email protected] |
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@foone They probably used a C macro that embedded all the code. So the binary g… |
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Post #AwnIxfVMePzEa10OP2 by [email protected] |
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it keeps track of how many enemies/planets are on screen by adding 2 to a globa… |
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Post #AwnJ0wBX5hk5BIHvAu by [email protected] |
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on 16-bit system, 2 is a very suspicious number |
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Post #AwnJ8hLm88jlULmOQ4 by [email protected] |
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yep there's an array of pointers! |
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Post #AwnJCBQAmeb9cXUxGK by [email protected] |
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@foone we have vtable at home |
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Post #AwnLvVNfcYKASp4Bqi by [email protected] |
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@foone Because there will always be button n+1 |
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Post #AwnLvVThG992lVt0F6 by [email protected] |
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@RealGene it's the PC joystick port! it famously doesn't have enough bu… |
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Post #AwngKYaKqIyGizDIJs by [email protected] |
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@foone |
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Post #AwpiesjAFfQtDA5Aoa by [email protected] |
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@TomF @foone And therefore you should read both at once (two bits on one port),… |
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Post #AwpiesoTvtgbTeZQ6S by [email protected] |
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@StompyRobot @foone Ah yes fond memories of the framerate increasing when you m… |
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Post #AwuWxHde91AM1ZJF3I by [email protected] |
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this file loading code is broken. it tries to load the file in 64kb chunks but … |
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Post #AwuXfkXG4FDWO8WZMW by [email protected] |
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at least this is a compression algorithm that isn't too complicated: it'… |
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Post #AwuXix4ltlfm9Pj85Y by [email protected] |
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although technically this is the second time I hacked this compression, I did f… |
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Post #AwubHxGvSesqkynJLc by [email protected] |
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this game uses a ton of hardcoded offsets into data files. I wonder if this was… |
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Post #Awuch325HRb5ohNhvE by [email protected] |
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@foone For most of the horrors you're posting about I don't even know h… |
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Post #AwudfolivZOFF6hqYC by [email protected] |
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@foone Autogenerated header file with a bunch of enums/# defines (or language e… |
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Post #Awudfos6XqUhYtgwUq by [email protected] |
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@snowfox that's what I hope, but I fear it's not the case |
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Post #AwudoHHOoC4xz5YXfk by [email protected] |
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one of the performance things done in this code is that the blit function is fu… |
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Post #AwudpGz7OGINMLTomm by [email protected] |
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@foone that's good, I guess... |
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Post #AwufVVI0hD0xqE19No by [email protected] |
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oh god.the compression has two varieties. There's no header to determine wh… |
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Post #AwugkujaTVYV3SpR8S by [email protected] |
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oh hey this is interesting: See this palette-cycling-ass effect? The palette ne… |
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Post #AwuheEA3wnBXEYaUy0 by [email protected] |
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@foone haha |
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Post #AwujVABXYqVmCi5Ibg by [email protected] |
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okay, so this fire effect is being run dynamically: it's iterating over par… |
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Post #AwujZ1AP26bxOOOGW0 by [email protected] |
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but it's happening per-pixel, which means they need to keep track of which … |
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Post #AwujjVdGcLv0m8tUkS by [email protected] |
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IT'S RIGHT THERE, BABY! |
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Post #AwujvAoFrVIlfaayki by [email protected] |
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The game uses the palette entries 0 and 143 to determine if it's going up o… |
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Post #Awujyr6D5R8bhIkXOS by [email protected] |
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it's at the top (left and right) and bottom because it was misplaced. The o… |
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Post #Awuk1WVQ6oLMhGoV60 by [email protected] |
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but since it's invisible, who cares? |
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Post #Awuk1aQFXyaIqOQQam by [email protected] |
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the developer may not have even known they misplaced it |
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Post #Awuk71mZFbfz9CSVfM by [email protected] |
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I could probably fix it, though. |
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Post #AwukLzz4Df4luhRazI by [email protected] |
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@foone Surely someone would have set the colors visible to see what it looks li… |
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Post #AwukkDwrx1mQApy35k by [email protected] |
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@foone unclosed parentheses in comment. |
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Post #AwuksXkeCybNuMDZgG by [email protected] |
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this is what the logo loaded from the datafiles looks like: Since each pixel st… |
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Post #AwulH1IS0m14UUhUTw by [email protected] |
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@foone looks like the gradient is changed through some sort of perlin noise gen… |
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Post #AwulLgN3EyPn2S4kHA by [email protected] |
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@foone no fix, just make it so there is a config line to turn the black to a co… |
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Post #AwurTy0GAPoplYkTCK by [email protected] |
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@foone aaaand now I have Devin Townsend stuck in my head again |
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Post #Awus0WB0e9Th1HIY7c by [email protected] |
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@foone getting >64k file reading/writing wrong seems fairly common. I guess … |
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Post #AwuuQbikr6L5eVeO4u by [email protected] |
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@fooneThat seems to be the current industry consensus on adding LLM training si… |
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Post #AwuyYLVBRMqDU3FRI0 by [email protected] |
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@foone i guessed they would've used even/odd palette entries or made a cycl… |
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Post #AwvNdpvcF0we9RKIiW by [email protected] |
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@foone such a favorite |
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Post #AwvRmiypqK451cKGSO by [email protected] |
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@foone Hm. There's enough free palette space there that I think they could … |
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Post #AwvRmjQqACSyQTQd6m by [email protected] |
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@foone (i.e. if you need <128 palette entries, duplicate it, then sneak the … |
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Post #Aww31VqOf4ZKvqIGJM by [email protected] |
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god this code.I KNOW PROGRAMMERS WHO REUSE COMMON CODE AS FUNCTIONS AND THEY… |
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Post #Aww43qBY6X5YYIrSxE by [email protected] |
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why have a load_sprite function when you can just inline slightly different fil… |
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Post #Aww45T4H1cHVQzEa8W by [email protected] |
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@foone I try to use at least three different programming languages for each com… |
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Post #Aww4BX0jHKrJOsT3oW by [email protected] |
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it's also got a weird palette file.See, VGA is 6 bit per channel, not 8. Bu… |
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Post #Aww4HpUJUgFqRZJC4W by [email protected] |
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it instead loads all palettes as 0000000 for all colors, then reloads the palet… |
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Post #Aww4L4o6zeWQpB7LKy by [email protected] |
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so 0x3F ends up as 0x3F, as does 0x40, 0x41, and so on up to 0xFF |
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Post #Aww6xv7h8H3LzXvXXM by [email protected] |
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@foone I have heard a claim that if it's stupid but works, it isn't stu… |
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Post #AwwBDJNxbj43Ot873w by [email protected] |
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@foone Blame the compiler, it probably inlined it all behind their backs! |
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Post #AwwBKjFhpjmleUo13o by [email protected] |
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ugh. this program uses the same DS value for all functions EXCEPT the communica… |
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Post #AwwBNfB3ROCpsm1s4u by [email protected] |
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@StompyRobot no compiler, this was written in x86 assembly |
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Post #AwwBUl9rbQh4SUr8JE by [email protected] |
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@foone macros then |
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Post #AwwBYHIwXVUL1mmSjA by [email protected] |
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@StompyRobot I hope so, and it's not just all copy-paste |
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Post #AwwEc8HALjBm2xTkgK by [email protected] |
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@foone Reminds me of those sizecoded demos where similar effects are done with … |
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Post #AwwEc8NtwgZoNqd8BE by [email protected] |
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@nikku4211 yeah no, this EXE is definitely not sizedcoded. it's got duplica… |
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Post #AwwFA49SBrBD6K3Ilk by [email protected] |
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@foone sounds like there's a good chance some of my former coworkers wrote … |
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Post #AwwFA4Fpo8HfQ72OiO by [email protected] |
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@mk is your former coworker James Schmalz? because that's who wrote this :) |
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Post #AwwFHmzPsilSBu2Y7s by [email protected] |
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@foone well, no, but:We had a tool to parse a kind of log file. The tool was w… |
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Post #AwwFSot1Aa4DG8J67E by [email protected] |
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@mk yikes |
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Post #AwwFTKCajr8yNohfQe by [email protected] |
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@foone Then it's definitely an epic MegaGame that really lives up to its pu… |
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Post #AxEQw4dmIO8lfy1VLM by [email protected] |
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@foone (...although surely you could also just copy-and-mirror the gradient to … |
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Post #Ay3dXoiv1zllpG9Ebw by [email protected] |
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@dgelessus @foone I think I know some allocators that would love to be able to … |
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Post #Ay3dY5Ssms2jkRmATY by [email protected] |
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@dgelessus @foone You could have just posted nothing at all, nobody would have … |
