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Anton's OpenGL 4 Tutorials book demo code

This series of demos accompanies the e-book "Anton's OpenGL 4 Tutorials": antongerdelan.net/opengl

Info

See "LICENCE.txt" for licence information.

Each chapter with major demonstration code has a corresponding demo here. There is also an example of code for Hello Triangle for OpenGL 2.1 for reference.

Each demo has easy-to-read Makefiles for Linux, MacOS, and Windows. You may need to download newer versions of the libraries in the common/ folder.

This code is some years old now and builds may fall out of date. I try to maintain this so that it functions but be aware that Makefiles and build details may differ slightly from book text for this reason.

Compiling

The libraries depended on reside in the common/ folder

  • common/include - Header files.
  • common/linux_x86_64 - 64-bit GNU/Linux libraries.
  • common/osx_64 - 64-bit Apple macOS libraries.
  • common/win32 - 32-bit Windows GCC (MinGW) libraries.
  • common/win64_gcc - 64-bit Windows GCC (MinGW-w64) libraries.

Linux

  • Install a C and C++ compiler - usually by installing a "build-essential" bundle package via the package manager on your distribution. E.g. for Ubuntu:
sudo apt install build-essential
  • Install the GLFW3, FreeType, and zlib development libraries:
sudo apt install libglfw3-dev
sudo apt install libfreetype6-dev
sudo apt install zlib1g-dev
  • Open a terminal and cd to the demo of choice, then
make -f Makefile.linux64

Apple macOS

  • Install Clang or GNU compiler and tools - usually by installing Apple XCode through the App Store. It's free.
  • Open a terminal and cd to the demo of choice:
make -f Makefile.osx

Windows with Visual Studio

The original Visual Studio solution has gone out of date now, so I removed it. Instead, create a new Empty, C++, Console project. You can then easily install the required libraries with NuGet, under the Project menu of a new C++ project, and you're ready to draw a triangle in 5 minutes.

Install Libraries with NuGet

  1. In the Browse tab search for and install; glfw, and glew. For later tutorials you can also find assimp, and freetype, when required.
  2. You need to add the text opengl32.lib to your linker input string. You can find this in Project->Properties->Configuration Properties->Linker->Input->Additional Dependencies. Just add opengl32.lib; to the front of the long string of dependencies so that it changes to opengl32.lib;kernel32.lib;user32;....
  3. You do not need to add the libraries you installed via NuGet to the linker string.
  4. You can now compile a "Hello Triangle" demo for OpenGL using GLFW and GLEW.

Install Libraries Manually

If you would rather do things the old fashioned way, without using a package manager, I have recorded a 2020 video stream tutorial where I show how to get Visual Studio set up and start programming OpenGL, including downloading and setting up libraries.

Tutorial: Intro to 3D Graphics Programming with OpenGL 4 (with Anton). Stream Recording.

This includes a very verbose set-up of Visual Studio 2019 with helper libraries.

Windows with GCC

  • Install the GNU Compiler Collection - usually by installing MinGW. I suggest the minimal MinGW GCC distro at https://nuwen.net/mingw.html.
  • Open a console and cd to the demo of choice.
  • make -f Makefile.win64 (Note that MinGW may have renamed make.exe to mingw-make32.exe or similar).
  • make -f Makefile.win32 for the 32-bit build.
  • Copy library .dll files from their MinGW binary folder to the same folder as your demo's .exe file.

If you have trouble linking supporting libraries you may need to recompile GLFW, GLEW, AssImp, and FreeType. It's a good idea to do this anyway to stay up to date.

Caveats and Errata

  • Since publication the most reliable version of newer OpenGL that will work everywhere, including macOS, is 4.1 Core. I suggest hinting to use this version first.
  • Code is directly copy-pasted from book sections. This means that there will be redundant OpenGL calls to bind things etc., but I think it's easier to follow along like this.
  • Code explained in prior examples is moved to a file called gl_utils.cpp to avoid cluttering main.cpp. This means that gl_utils.cpp is not necessarily the same in each demo, but is built up gradually.
  • Out of date build files have been removed; 32-bit Linux and older Visual Studio files.
  • Sometimes people ask for C examples. OpenGL is a C API, and I would have used C if writing the text later. Readers wishing to use a C compiler should do so - only very minor code convention changes are required.

Credits

Special thanks to all the readers over the years that have submitted additions, bug reports, fixes, and feedback. If you have submitted a correction and don't mind having your name/@ printed here please let me know (or if you'd like to change these details).

Contributors

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