<commit_before>#![deny(missing_docs)]
#![warn(dead_code)]

//! A user friendly game engine written in Rust.

#[cfg(feature = "include_gfx")]
extern crate libc;
#[cfg(feature = "include_gfx")]
extern crate gfx;
#[cfg(feature = "include_gfx")]
extern crate gfx_device_gl;
#[cfg(feature = "include_gfx")]
extern crate gfx_graphics;
#[cfg(feature = "include_opengl")]
extern crate opengl_graphics;
#[cfg(feature = "include_sdl2")]
extern crate sdl2;
#[cfg(feature = "include_sdl2")]
extern crate sdl2_window;
#[cfg(feature = "include_glfw")]
extern crate glfw;
#[cfg(feature = "include_glfw")]
extern crate glfw_window;
#[cfg(feature = "include_glutin")]
extern crate glutin;
#[cfg(feature = "include_glutin")]
extern crate glutin_window;
extern crate graphics;
extern crate fps_counter;
extern crate current;
extern crate shader_version;

extern crate piston;

#[cfg(feature = "include_sdl2")]
pub use sdl2_window::Sdl2Window as WindowBackEnd;
#[cfg(feature = "include_glfw")]
pub use glfw_window::GlfwWindow as WindowBackEnd;
#[cfg(feature = "include_glutin")]
pub use glutin_window::GlutinWindow as WindowBackEnd;

#[cfg(feature = "include_gfx")]
use gfx_graphics::Gfx2d;
#[cfg(feature = "include_gfx")]
use gfx::{ DeviceExt };
#[cfg(feature = "include_gfx")]
use gfx_device_gl::{ GlDevice, GlResources };
#[cfg(feature = "include_gfx")]
use gfx_device_gl::CommandBuffer;

#[cfg(feature = "include_opengl")]
use opengl_graphics::GlGraphics;
use fps_counter::FPSCounter;

use std::rc::Rc;
use std::cell::RefCell;

use piston::window::WindowSettings;
use piston::quack::{ Get, Set };
use current::{ Current, CurrentGuard };

fn start_window<F>(
    opengl: shader_version::OpenGL,
    window_settings: WindowSettings,
    mut f: F
)
    where
        F: FnMut()
{
    let mut window = Rc::new(RefCell::new(WindowBackEnd::new(
        opengl,
        window_settings,
    )));
    let mut fps_counter = Rc::new(RefCell::new(FPSCounter::new()));

    #[cfg(feature = "include_sdl2")]
    fn disable_vsync() { sdl2::video::gl_set_swap_interval(0); }

    #[cfg(not(feature = "include_sdl2"))]
    fn disable_vsync() {}

    disable_vsync();

    let window_guard = CurrentGuard::new(&mut window);
    let fps_counter_guard = CurrentGuard::new(&mut fps_counter);

    f();

    drop(window_guard);
    drop(fps_counter_guard);
}

#[cfg(feature = "include_opengl")]
fn start_opengl<F>(opengl: shader_version::OpenGL, mut f: F)
    where
        F: FnMut()
{
    let mut gl = Rc::new(RefCell::new(GlGraphics::new(opengl)));
    
    let gl_guard = CurrentGuard::new(&mut gl);

    f();    

    drop(gl_guard);
}

#[cfg(not(feature = "include_opengl"))]
fn start_opengl<F>(mut f: F)
    where
        F: FnMut()
{
    f();
}


#[cfg(feature = "include_gfx")]
fn start_gfx<F>(mut f: F)
    where
        F: FnMut()
{
    let window = current_window();

    let mut device = Rc::new(RefCell::new(GlDevice::new(|s| {
        #[cfg(feature = "include_sdl2")]
        fn get_proc_address(_: &WindowBackEnd, s: &str) ->
            *const libc::types::common::c95::c_void {
            unsafe { std::mem::transmute(sdl2::video::gl_get_proc_address(s)) }
        }

        #[cfg(feature = "include_glfw")]
        fn get_proc_address(window: &mut WindowBackEnd, s: &str) ->
            *const libc::types::common::c95::c_void {
            window.window.get_proc_address(s)
        }

        #[cfg(feature = "include_glutin")]
        fn get_proc_address(window: &WindowBackEnd, s: &str) -><commit_msg>Fixed build without "include_opengl"<commit_after>#![deny(missing_docs)]
#![warn(dead_code)]

//! A user friendly game engine written in Rust.

#[cfg(feature = "include_gfx")]
extern crate libc;
#[cfg(feature = "include_gfx")]
extern crate gfx;
#[cfg(feature = "include_gfx")]
extern crate gfx_device_gl;
#[cfg(feature = "include_gfx")]
extern crate gfx_graphics;
#[cfg(feature = "include_opengl")]
extern crate opengl_graphics;
#[cfg(feature = "include_sdl2")]
extern crate sdl2;
#[cfg(feature = "include_sdl2")]
extern crate sdl2_window;
#[cfg(feature = "include_glfw")]
extern crate glfw;
#[cfg(feature = "include_glfw")]
extern crate glfw_window;
#[cfg(feature = "include_glutin")]
extern crate glutin;
#[cfg(feature = "include_glutin")]
extern crate glutin_window;
extern crate graphics;
extern crate fps_counter;
extern crate current;
extern crate shader_version;

extern crate piston;

#[cfg(feature = "include_sdl2")]
pub use sdl2_window::Sdl2Window as WindowBackEnd;
#[cfg(feature = "include_glfw")]
pub use glfw_window::GlfwWindow as WindowBackEnd;
#[cfg(feature = "include_glutin")]
pub use glutin_window::GlutinWindow as WindowBackEnd;

#[cfg(feature = "include_gfx")]
use gfx_graphics::Gfx2d;
#[cfg(feature = "include_gfx")]
use gfx::{ DeviceExt };
#[cfg(feature = "include_gfx")]
use gfx_device_gl::{ GlDevice, GlResources };
#[cfg(feature = "include_gfx")]
use gfx_device_gl::CommandBuffer;

#[cfg(feature = "include_opengl")]
use opengl_graphics::GlGraphics;
use fps_counter::FPSCounter;

use std::rc::Rc;
use std::cell::RefCell;

use piston::window::WindowSettings;
use piston::quack::{ Get, Set };
use current::{ Current, CurrentGuard };

fn start_window<F>(
    opengl: shader_version::OpenGL,
    window_settings: WindowSettings,
    mut f: F
)
    where
        F: FnMut()
{
    let mut window = Rc::new(RefCell::new(WindowBackEnd::new(
        opengl,
        window_settings,
    )));
    let mut fps_counter = Rc::new(RefCell::new(FPSCounter::new()));

    #[cfg(feature = "include_sdl2")]
    fn disable_vsync() { sdl2::video::gl_set_swap_interval(0); }

    #[cfg(not(feature = "include_sdl2"))]
    fn disable_vsync() {}

    disable_vsync();

    let window_guard = CurrentGuard::new(&mut window);
    let fps_counter_guard = CurrentGuard::new(&mut fps_counter);

    f();

    drop(window_guard);
    drop(fps_counter_guard);
}

#[cfg(feature = "include_opengl")]
fn start_opengl<F>(opengl: shader_version::OpenGL, mut f: F)
    where
        F: FnMut()
{
    let mut gl = Rc::new(RefCell::new(GlGraphics::new(opengl)));
    
    let gl_guard = CurrentGuard::new(&mut gl);

    f();    

    drop(gl_guard);
}

#[cfg(not(feature = "include_opengl"))]
fn start_opengl<F>(_opengl: shader_version::OpenGL, mut f: F)
    where
        F: FnMut()
{
    f();
}


#[cfg(feature = "include_gfx")]
fn start_gfx<F>(mut f: F)
    where
        F: FnMut()
{
    let window = current_window();

    let mut device = Rc::new(RefCell::new(GlDevice::new(|s| {
        #[cfg(feature = "include_sdl2")]
        fn get_proc_address(_: &WindowBackEnd, s: &str) ->
            *const libc::types::common::c95::c_void {
            unsafe { std::mem::transmute(sdl2::video::gl_get_proc_address(s)) }
        }

        #[cfg(feature = "include_glfw")]
        fn get_proc_address(window: &mut WindowBackEnd, s: &str) ->
            *const libc::types::common::c95::c_void {
            window.window.get_proc_address(s)
        }

        #[cfg(feature = "include_glutin")]
        fn get_proc_address(window: &WindowBackEnd, s: &str) ->
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