I've been working on a few improvements for this little game. It is still lacking some things, like sound and many improvements that I might eventually implement. But for this release, these have been the changes:
- Control improvements: now the character jumps higher, the control while jumping is more accurate, and jump responsiveness has been dramatically improved
- Visual improvements: all character's sprites have been cleaned up (no residual pixels)
- New 'slipping' behaviour: when the character is slipping down a slope, he will react accordingly (basically, a new 1-frame animation has been added)
Remember you can collaborate on this development as it is an open source project!
The world is small they say and these two kids want to put the six degrees of separation theory in action: six degrees of separation between me and the party, a fun adventure game with 3 endings by Axoona created for the 'a small world' themed Ludum Dare 38 game jam. Controls: WASD or arrow keys: Tweet. Finished my grocery list; Avoided small talk; Made it to the checkout. Ludum Dare is an online event where games are made from scratch in a weekend. Check us out every April and October! Feed News Explore Games. Welcome to Ludum Dare 48. Published 6 days ago 213 25. We're also open source! If you want to help with the code, it's available on GitHub.
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Gameboy Development on Mac OS X
309
1
357294As I have gone more and more low-level over the past month, I was searching for a platform that is well understood/documented, not too fancy and thus allows me to use it for learning on different topics at once in a fun way. I.e. micro-processors/electrical-engineering, emulators, dev-tools.
Well, I found the old Gameboy to match that category:
- Electrical Engineering: Building own game cartridges/ROMs, ROM-readers/writers and play around with other interfacing possibilities. As it happens, I still have my old Gameboy lying around… somewhere…
- Emulators: Write a simple emulator for the Gameboy's Z80 processor. Compared to others, the instruction of the Z80 is 'quiet' small. Except for the CHIP-8 language, there are not many other processor that are this popular and have an as small instruction set.
- Dev-Tools: Understanding how compiler and linker for this platform work and tinkering with it. As one of the most popular tool-chains (Rednex Gameboy Development System358295) is open-source and a comparably small project, this is hopefully not a month-long endeavor.
And I like doing game-development for fun anyway. With a quiet old and restricted platform like the Gameboy, this is a nice thing to do in with limited time and good results. Building only a simple game for PC or any of the latest Mobile-platforms (iOS, Android) can take month when you also have some sense for art and style. With a four-color 160×144 pixel display, you are so restricted on itself, that doing the graphics yourself is quiet easy; even for someone that is not a great artist. I was surprised what can be achieved on a 14 hour flight. Maybe I will even enter the next Ludum Dare359296 with a Gameboy game.
The first step required to dive into the world of Gameboy development is to set up the development tools, emulator and some more useful tools like tile-editors on your Mac. The main purpose of this post is to describe the steps I have taken. And as it was more then just click-click-finish at some stages, I hope this will also be helpful to others.
RGBDS360297 seems to be a popular set of developer tools for the original Gameboy. It contains four command-line tool for which two are the assembler and the linker. Unfortunately, there is no binary available for Mac OS. Fortunately, it is open source. With minor modifications I was able to compile the tools for Mac OS X Lion. You can find the compiled binaries (rgbds.tar361298) and the Makefile I used in my github repository362299.
Next thing I needed for development was an emulator with an embeded deugger. Who writes a working game with closed eyes, loads it onto a gameboy cartidge and it works? Well, at least not me.
The emulators I found to be the best matches are no$gmb363300 and bgb364301. Both are similar feature wise; bgb seems to have been implemented based on no$gmb, so both interfaces look alike and also shortcuts in the debugger are mostly the same. bgb is still actively developed and you can also get tips by the developer in the EFNet #gbdev IRC channel.
Both emulators are for windows originally and they are not open source. So, using Wine was the only real option. If you don't have Wine yet installed, you might want to download MacPorts365302. It is a package manager for Mac OS and also allows to easily install said software. As you also need to have the X11 window server installed for Wine to work properly, best is to follow these instructions366303 for the whole installation.
Ludum Dare 38 - Contamination Mac Os Pro
The Installation of wine itself is straightforward: After the installing MacPorts type 'sudo port' in the Terminal.app to start the MacPorts package manager. Supply your user's password and the prompt of the package manager should appear. Type 'install wine' and do something else for the next half hour. This will download all dependencies (a lot) and install Wine on your system. I got an error like
while installing Wine because it seemed to interfere with other packages I have already had installed. If you also encounter this problem, follow the workaround at the bottom of this bug-ticket367304:
Gameboy Development on Mac OS X
309
1
357294As I have gone more and more low-level over the past month, I was searching for a platform that is well understood/documented, not too fancy and thus allows me to use it for learning on different topics at once in a fun way. I.e. micro-processors/electrical-engineering, emulators, dev-tools.
Well, I found the old Gameboy to match that category:
- Electrical Engineering: Building own game cartridges/ROMs, ROM-readers/writers and play around with other interfacing possibilities. As it happens, I still have my old Gameboy lying around… somewhere…
- Emulators: Write a simple emulator for the Gameboy's Z80 processor. Compared to others, the instruction of the Z80 is 'quiet' small. Except for the CHIP-8 language, there are not many other processor that are this popular and have an as small instruction set.
- Dev-Tools: Understanding how compiler and linker for this platform work and tinkering with it. As one of the most popular tool-chains (Rednex Gameboy Development System358295) is open-source and a comparably small project, this is hopefully not a month-long endeavor.
And I like doing game-development for fun anyway. With a quiet old and restricted platform like the Gameboy, this is a nice thing to do in with limited time and good results. Building only a simple game for PC or any of the latest Mobile-platforms (iOS, Android) can take month when you also have some sense for art and style. With a four-color 160×144 pixel display, you are so restricted on itself, that doing the graphics yourself is quiet easy; even for someone that is not a great artist. I was surprised what can be achieved on a 14 hour flight. Maybe I will even enter the next Ludum Dare359296 with a Gameboy game.
The first step required to dive into the world of Gameboy development is to set up the development tools, emulator and some more useful tools like tile-editors on your Mac. The main purpose of this post is to describe the steps I have taken. And as it was more then just click-click-finish at some stages, I hope this will also be helpful to others.
RGBDS360297 seems to be a popular set of developer tools for the original Gameboy. It contains four command-line tool for which two are the assembler and the linker. Unfortunately, there is no binary available for Mac OS. Fortunately, it is open source. With minor modifications I was able to compile the tools for Mac OS X Lion. You can find the compiled binaries (rgbds.tar361298) and the Makefile I used in my github repository362299.
Next thing I needed for development was an emulator with an embeded deugger. Who writes a working game with closed eyes, loads it onto a gameboy cartidge and it works? Well, at least not me.
The emulators I found to be the best matches are no$gmb363300 and bgb364301. Both are similar feature wise; bgb seems to have been implemented based on no$gmb, so both interfaces look alike and also shortcuts in the debugger are mostly the same. bgb is still actively developed and you can also get tips by the developer in the EFNet #gbdev IRC channel.
Both emulators are for windows originally and they are not open source. So, using Wine was the only real option. If you don't have Wine yet installed, you might want to download MacPorts365302. It is a package manager for Mac OS and also allows to easily install said software. As you also need to have the X11 window server installed for Wine to work properly, best is to follow these instructions366303 for the whole installation.
Ludum Dare 38 - Contamination Mac Os Pro
The Installation of wine itself is straightforward: After the installing MacPorts type 'sudo port' in the Terminal.app to start the MacPorts package manager. Supply your user's password and the prompt of the package manager should appear. Type 'install wine' and do something else for the next half hour. This will download all dependencies (a lot) and install Wine on your system. I got an error like
while installing Wine because it seemed to interfere with other packages I have already had installed. If you also encounter this problem, follow the workaround at the bottom of this bug-ticket367304:
Ludum Dare 38 - Contamination Mac Os Download
Once you have installed wine successfully, you can start the emulator. I was not able to get bgb running yet but no$gmb works just fine. Get the 32-bit Windows version from here368305 and start it with 'wine NO$GMB.EXE' from the commandline.
Ludum Dare 38 - Contamination Mac Os X
As said before, a quiet restricted platform like the Gameboy allows also a developer without a hand for art to create nice games. Still, you might want some tools to assist in the process. The Gameboy Tile Designer369306 and the Gameboy Map Builder370307 are two such tools. Easily generate tiles and maps and directly export them into an assembler-file containing the required data to directly work with the tiles/maps. These tools are again windows-only but work just fine with wine.
Ludum Dare Games
Unfortunately, as of this writing, the host for these tools seems to be shutting down its operation completely, so I hope the owner of these tools will find another host soon.
Ludum Dare 46
That's about what you need if you want to get into Gameboy development and have some retro-fun. To point you in the right direction for getting started I can recommend the notes of the Wichita State University's 2008 Z80 Assembler Programming lecture371308. Luckily, the exact same tools we just installed on our system are used 🙂
