GLFW example using C

This is a small example using C to create a GDNative script that exposes a very small part of the GLFW API.

Language: GDNative C

Renderer: GLES 2

Dependencies:

You need Godot headers, this is now a Git submodule of this repo.
clang, gcc, or any decent C compiler that's C11 compatible.
You need to have GLFW and its headers installed.
- On Ubuntu Linux: sudo apt install libglfw3 libglfw3-dev
- On macOS: brew install glfw

Compile with SCons (cross platform)

You can use SCons to compile the library if you have it installed:

scons platform=PLATFORM

Where PLATFORM is: windows, linuxbsd, or macos.

Manually compiling

Linux

To compile the library on Linux, do

cd src
clang -std=c11 -fPIC -c -I../godot_headers init.c -o init.os
clang -shared -lglfw init.os -o ../project/gdnative/linuxbsd/libglfw_godot.so

This creates the file libsimple.so in the project/gdnative/linuxbsd directory.

macOS

On macOS:

clang -std=c11 -fPIC -c -I../godot_headers -I/PATH/TO/GLFW/HEADERS init.c -o init.os -arch x86_64
clang -dynamiclib libglfw.dylib init.os -o project/gdnative/macos/libglfw_godot.dylib -arch x86_64 -framework Cocoa -framework OpenGL -framework IOKit -framework CoreVideo -Wl,-undefined,dynamic_lookup

This creates the file libsimple.dylib in the project/gdnative/macos directory.

If you want to statically link GLFW in just replace libglfw.dylib by libglfw.a, make sure to copy these files from GLFW.

Windows

On Windows: TODO: Missing GLFW-specific instructions

cd src
cl /Fosimple.obj /c simple.c /nologo -EHsc -DNDEBUG /MD /I. /I../godot_headers
link /nologo /dll /out:..\project\gdnative\windows\libsimple.dll /implib:..\project\gdnative\windows\libsimple.lib simple.obj

This creates the file libsimple.dll in the project/gdnative/windows directory.

Usage

Create a window object using load("res://GLFW.gdn").new()

This window object has following methods you can use:

create(int width, int height, string title)
close()
is_closed()
poll_events()

Also it has one signal, closed, which can be used to get notified when the window should be closed.

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