Crystal LibGLFW3

Note: Original binding was done by jellyman. I have however made a fork with fixes needed as it seems this user is not active anymore on this repo and I can't get my pull requests approved. Hence why this fork is independent of the original.

libglfw3 bindings for Crystal. See also my Idiomatic API which makes these bindings more accessible for Crystalists.

Installation

Add to your shards.yml:

dependencies:
  lib_glfw3:
    github: Groogy/crystal_lib_glfw3
    version: 0.1.1

Make sure you have libglfw3 installed on your system

On macOS you can install with homebrew:

brew install glfw3

Usage

Example code for creating a window (tested on macOS 10.11)

require "lib_glfw3"

if LibGLFW3.init != 0
  error_callback = ->(error : Int32, description : Int8*) {
    puts "Error #{error}: #{String.new(description.as(UInt8*))}"
  }
  LibGLFW3.setErrorCallback(error_callback)

  LibGLFW3.windowHint(LibGLFW3::OPENGL_PROFILE, LibGLFW3::OPENGL_CORE_PROFILE)
  LibGLFW3.windowHint(LibGLFW3::OPENGL_FORWARD_COMPAT, 1)
  LibGLFW3.windowHint(LibGLFW3::CONTEXT_VERSION_MAJOR, 3)
  LibGLFW3.windowHint(LibGLFW3::CONTEXT_VERSION_MINOR, 3)

  window = LibGLFW3.createWindow(800, 600, "Hello Crystal!", nil, nil)

  if window
    LibGLFW3.makeContextCurrent(window)
    LibGLFW3.swapInterval(1)

    while LibGLFW3.windowShouldClose(window) == 0
      LibGLFW3.swapBuffers(window)
      LibGLFW3.pollEvents
    end

    LibGLFW3.destroyWindow(window)
  else
    puts "Failed to create window"
  end

  LibGLFW3.terminate
else
  puts "GLFW failed to initialize"
end

See Also

1. LibGL bindings for Crystal
2. Idiomatic Crystal API for GLFW (makes lib_glfw3 nicer to work with)
3. Crystal OpenGL Samples

Contributing

1. Fork it ( https://github.com/Groogy/crystal_lib_glfw3/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• jellymann Daniel Smith - creator, maintainer
• Groogy Henrik Valter Vogelius Hansson - forker