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LibGLFW

Complete GLFW bindings written in Crystal.

LibGLFW offers Crystal bindings for the full GLFW specification. These bindings are relatively "raw" - with a few notable exceptions, names of functions, constants, and types remain unchanged.

Installation

First, make sure you've got GLFW3:

brew install glfw3

Add this to your application's shard.yml:

dependencies:
  lib_glfw:
    github: calebuharrison/LibGLFW
    branch: master

Install your dependencies:

shards install

Usage

require "lib_glfw"

# Initialize GLFW
LibGLFW.init

width, height, title, monitor, share = 640, 480, "My First Window!", nil, nil

# Create a window and its associated OpenGL context.
window_handle = LibGLFW.create_window(width, height, title, monitor, share)

# Render new frames until the window should close.
until LibGLFW.window_should_close(window_handle)
  LibGLFW.swap_buffers(window_handle)
end

# Destroy the window along with its context.
LibGLFW.destroy_window(window_handle)

# Terminate GLFW
LibGLFW.terminate

Differences From the C API

LibGLFW differs from the standard GLFW API in only a few, simple ways. Each of these differences only exists to make the API fit the style guide of the Crystal language.

Functions/Methods

Method names in LibGLFW do not have the "glfw" prefix that is present in the C API. Additionally, underscores are used to separate words rather than camel case. LibGLFW methods are all called as class methods of the LibGLFW lib.

In C:

  // Get and print the current version of GLFW
  int major, minor, rev;
  glfwGetVersion(&major, &minor, &rev);
  printf("Current version of GLFW is %d.%d.%d\n", major, minor, rev);

In Crystal:

# Get and print the current version of GLFW
LibGLFW.get_version(out major, out minor, out rev)
puts "Current version of GLFW is #{major}.#{minor}.#{rev}"

Constants

Prefixes have also been removed from constants, which are accessed directly from the lib.

In C:

// Check to see if the joystick is present and complain if it isn't.
if (!glfwJoystickPresent(GLFW_JOYSTICK_9)) {
  printf("Nooooooooooooooo!!!!!!\n");
}

In Crystal:

# Check to see if the joystick is present and complain if it isn't.
puts "Noooooooooooo!!!!!!" unless LibGLFW.joystick_present(LibGLFW::JOYSTICK_9)

Contributing

  1. Fork it ( https://github.com/calebuharrison/LibGLFW/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

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Complete GLFW bindings for Crystal.

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