• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
Sign in to follow this  
Followers 0
OmarShehata

Linking Problems (How is this even possible?)

3 posts in this topic

So wanting to display fonts in my openGL app, I download this nifty little library:

http://ftgl.sourceforge.net/docs/html/index.html

Put the source in my code, add a linker directory to src/ so it finds the stuff, and it seems to be linking well. Okay good.

So the tutorial says to create a font object like this:

[CODE]
FTGLPixmapFont font("/home/user/Arial.ttf");
[/CODE]

Now it outputs an undefined error:

[center][i]\InitGame.cpp|15|undefined reference to `FTPixmapFont::FTPixmapFont(char const*)'|
\InitGame.cpp|42|undefined reference to `FTPixmapFont::~FTPixmapFont()'|
\InitGame.cpp|42|undefined reference to `FTPixmapFont::~FTPixmapFont()'|
||=== Build finished: 3 errors, 0 warnings ===|[/i][/center]

I keep checking if everything is in the correct folder, and they are. Now what's driving me nuts is if I do:

[CODE]
FTGLPixmapFont font(2); //Initlizing the variable with an incorrect argument
[/CODE]

The output is:
[center]
[i]\InitGame.cpp|15|error: invalid conversion from 'int' to 'const char*'|
\InitGame.cpp|15|error: initializing argument 1 of 'FTPixmapFont::FTPixmapFont(const char*)'|
||=== Build finished: 2 errors, 0 warnings ===|[/i]
[/center]
So it can find the function, it knows it's supposed to take a "char", and it finds the class and everything. Yet when I put back the correct argument, suddenly it's undefined. I'm still hazy on the rules of linking, but I thought I did everything correct, I can't explain why this could be happening.

Any help would be appreciated. Thanks!
0

Share this post


Link to post
Share on other sites
Technically the file with the definition of FTGLPixmapFont's constructor is not in the src directory, but the src/FTFont directory, so the linker probably can't find the definition. The behaviour you describe is due to the fact that the second error message is a compiler error (due to the fact that using an incorrect argument can be discovered during the compile phase rather than the link phase). To solve this problem, you could probably put src/FTFont/ in the linker directories.
1

Share this post


Link to post
Share on other sites
You need to link this library into your executable. With g++ its something like 'g++ -Ldirectory_of_lib -lthe_lib_name'
In visual studio, I'm not sure, but I think theres somewhere in the options what libraries to link in at compile time.

EDIT: My mistake. Didn't notice you said it was linking fine.
0

Share this post


Link to post
Share on other sites
[quote name='RulerOfNothing' timestamp='1330582924' post='4918098']
Technically the file with the definition of FTGLPixmapFont's constructor is not in the src directory, but the src/FTFont directory, so the linker probably can't find the definition. The behaviour you describe is due to the fact that the second error message is a compiler error (due to the fact that using an incorrect argument can be discovered during the compile phase rather than the link phase). To solve this problem, you could probably put src/FTFont/ in the linker directories.
[/quote]

Damnit, I keep forgetting how everyone declares function prototypes in the headers but the actual body is in the cpp files. Thanks for the heads up!

Ok, so scanning the code, I can't seem to find anything that loads FTPixmapFont.cpp. So I manually include that file in my code, and I get the error that it can't find a file called "config.h". FTPixmapFont.cpp is trying to include that file..but it doesn't seem to be anywhere in the source...

Why isn't anything ever straightforward?

EDIT: Ok, there's definitely something wrong here, if I remove the include "config.h" line, I get an error in FTPixmapFont.cpp that it can't find an FTFont function..which makes sense because again..FTFont.cpp is *not* included anywhere in main header file, that the tutorial says only that should be included.

It seems that if I simply modify that file to include the rest of the source files, then it should work...but I'm hesitant about that because y'know, you'd assume an engine like this to not have such an obvious mistake...
0

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0