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Table of Contents


GRRLIB is a C/C++ 2D/3D graphics library for Wii application developers. It is essentially a wrapper which presents a friendly interface to the Nintendo GX core.

This document is written to be viewed with equal clarity in either a web browser or a text editor.

GRRLIB is supplied as a standard C/C++ library (aka. archive) called 'libgrrlib'. Because GRRLIB processes JPEG and PNG images, it requires the installation of the 'libjpeg' and 'libpngu' libraries. 'libpngu', in turn, requires 'libpng' and 'libpng' requires 'libz'. GRRLIB has FileIO functions to allow real-time loading and saving of graphical data, and thus requires 'libfat'. GRRLIB also has the possibility to use TrueType fonts, so 'libfreetype' is also required.

libgrrlib          <- 2D/3D graphics library
├── libfat         <- File I/O
├── libjpeg        <- JPEG image processor
├── libpngu        <- Wii wrapper for libpng
│   └── libpng     <- PNG image processor
│       └── libz   <- Zip (lossless) compression (for PNG compression)
└── libfreetype    <- TrueType font processor

Developing for the Wii

Do not progress until you have installed and configured devkitPro. Guides are and assistance are available at https://devkitpro.org/index.php

If you have just performed a clean (re)install on your Windows PC, be sure to reboot before you continue.

Downloading GRRLIB

You are invited to use "the latest Git master version" of GRRLIB at all times.

The Git repository is located at: https://github.com/GRRLIB/GRRLIB

There is a simple guide to "Using GitHub" later in this document.

This document will presume that you have downloaded "the latest Git master version" to a directory called C:\grr

Installing GRRLIB

This guide is for Windows. If you are using Linux, I am going to presume you are smart enough to convert these instructions.

GRRLIB      is supplied as source code
libjpeg     is supplied as source code
libpngu     is supplied as source code
libpng      is supplied as source code
libz        is supplied as source code
libfreetype is supplied as source code
libfat      is supplied with devkitPro (i.e. preinstalled)

The easy way is to install GRRLIB and all the required libraries in a single command:

  cd \grr\GRRLIB
  make clean all install

This process may take some time depending on the speed of your PC.

If you used the method above the following steps are not required, GRRLIB is installed and you are ready to start developing Wii homebrew games.

If you want, you could install the libz, libpng, libpngu, libjpeg and libfreetype libraries in a single command:

  cd \grr\GRRLIB\lib 
  make clean all install

Each library could also be installed individually:

To install libz

  cd \grr\GRRLIB\lib\zlib
  make clean all install

To install libpng

  cd \grr\GRRLIB\lib\png
  make clean all install

To install libpngu

  cd \grr\GRRLIB\lib\pngu
  make clean all install

To install libjpeg

  cd \grr\GRRLIB\lib\jpeg
  make clean all install

To install libfreetype

  cd \grr\GRRLIB\lib\freetype
  make clean all install

To install libgrrlib:

  make clean all install


After everything is installed, simply put

#include <grrlib.h>

at the top of your .c/.cpp file and use the functions as required

You will also need to add

-lgrrlib -lfreetype -lfat -ljpeg -lpngu -lpng -lz

to the libs line in your makefile

...Remember the order of the libraries is critical. You may (need to) insert other libraries in the middle of the list, you may need to add others to the start, or even the end - but do not change the order of the libraries shown here.

You do NOT need to place /anything/ in your application directory.

If you would like to see a working example of this, you can look at the example found in: C:\grr\examples\template\source

Upgrading to v4.1.0 From Previous Versions of GRRLIB

Older versions of GRRLIB, required a line such as:

#include "../../../GRRLIB/GRRLIB/GRRLIB.h"

...to be placed at the top of each C file which uses GRRLB. Because GRRLIB is now installed as a system library, this must be replaced with:

#include <grrlib.h>

Older versions of GRRLIB required the 'GRRLIB.h' and 'GRRLIB.c" files to be present in every project which uses GRRLIB. Because GRRLIB is now installed as a system library, these files are no longer required and must be erased. WARNING Be careful if you have edited (either of) these files.

Older versions of GRRLIB "passed 'structs'" and therefore Textured Images were defined with:

  GRRLIB_texImg  tex1, tex2;

Because GRRLIB now "passes 'pointers'" these definitions should be changed to:

  GRRLIB_texImg  *tex1, *tex2;

With older versions of GRRLIB if the programmer (you) required access to the mode and frame information, you were required to add one or more of the following three lines:

  extern GXRModeObj  *rmode;
  extern void        *xfb[2];
  extern u32         fb;

Because GRRLIB now does this for you automatically, these lines must be removed from your code.

Using GitHub

GitHub allows the developers to submit changes to the code in such a way that these changes can be easily monitored, quickly merged together with other changes. and (if necessary) reverted.

It also allows the power-users to gain access to the latest (often "in-test") features.

To obtain the "cutting edge" codebase go to https://github.com/GRRLIB/GRRLIB/tree/master

  1. Create a directory to hold the code (e.g. C:\grr)
  2. Click the Download ZIP button if you don't have the proper tools installed on your PC or Clone the following URL https://github.com/GRRLIB/GRRLIB.git

All official releases can be found here https://github.com/GRRLIB/GRRLIB/releases


Project Leader

  • NoNameNo


  • Crayon
  • BlueChip

Lead Coder

  • NoNameNo

Support Coders

  • Crayon
  • Xane
  • DragonMinded
  • BlueChip
  • elisherer


  • RedShade
  • Jespa


GRRLIB is released under the MIT Licence. If we had chosen the GPL licence you would be +forced+ (legally required) to release your source code. But in the spirit of "free as in FREE" we have left you with the +option+ to release your source code.

We do +request+ that you tell others about us by naming our library (GRRLIB) in the credits of your game/application. And, if you +choose+ to do that, we encourage you to use our logo to achieve it; You can find our logo here: C:\grr\grrlib_logo.png and here: https://raw.githubusercontent.com/GRRLIB/GRRLIB/master/grrlib_logo.png