1 files changed, 312 insertions, 0 deletions
diff --git a/engine/src/window.rs b/engine/src/window.rs
new file mode 100644
index 0000000..fde2cca
--- /dev/null
+++ b/engine/src/window.rs
@@ -0,0 +1,312 @@
+use std::borrow::Cow;
+use std::ffi::{CStr, CString};
+
+use ecs::actions::Actions;
+use ecs::extension::Collector as ExtensionCollector;
+use ecs::sole::Single;
+use ecs::Sole;
+use glfw::WindowSize;
+
+use crate::data_types::dimens::Dimens;
+use crate::event::{PostPresent as PostPresentEvent, Start as StartEvent};
+use crate::vector::Vec2;
+
+mod reexports
+{
+    pub use glfw::window::{
+        CursorMode,
+        Hint as CreationHint,
+        InputMode,
+        Key,
+        KeyModifiers,
+        KeyState,
+    };
+}
+
+pub use reexports::*;
+
+#[derive(Debug, Sole)]
+/// Has to be dropped last since it holds the OpenGL context.
+#[sole(drop_last)]
+pub struct Window
+{
+    inner: glfw::Window,
+}
+
+impl Window
+{
+    /// Returns a new Window builder.
+    #[must_use]
+    pub fn builder() -> Builder
+    {
+        Builder::default()
+    }
+
+    /// Sets the value of a input mode.
+    ///
+    /// # Errors
+    /// Returns `Err` if the input mode is unsupported on the current system.
+    pub fn set_input_mode(
+        &self,
+        input_mode: InputMode,
+        enabled: bool,
+    ) -> Result<(), Error>
+    {
+        Ok(self.inner.set_input_mode(input_mode, enabled)?)
+    }
+
+    /// Sets the cursor mode.
+    ///
+    /// # Errors
+    /// If a platform error occurs.
+    pub fn set_cursor_mode(&self, cursor_mode: CursorMode) -> Result<(), Error>
+    {
+        Ok(self.inner.set_cursor_mode(cursor_mode)?)
+    }
+
+    /// Returns whether or not the window should close. Will return true when the user has
+    /// attempted to close the window.
+    #[must_use]
+    pub fn should_close(&self) -> bool
+    {
+        self.inner.should_close()
+    }
+
+    /// Processes all pending events.
+    ///
+    /// # Errors
+    /// If a platform error occurs.
+    pub fn poll_events(&self) -> Result<(), Error>
+    {
+        Ok(self.inner.poll_events()?)
+    }
+
+    /// Swaps the front and back buffers of the window.
+    ///
+    /// # Errors
+    /// Will return `Err` if a platform error occurs or if no OpenGL window context
+    /// is present.
+    pub fn swap_buffers(&self) -> Result<(), Error>
+    {
+        Ok(self.inner.swap_buffers()?)
+    }
+
+    /// Returns the size of the window.
+    ///
+    /// # Errors
+    /// Will return `Err` if a platform error occurs.
+    pub fn size(&self) -> Result<Dimens<u32>, Error>
+    {
+        let size = self.inner.size()?;
+
+        Ok(Dimens {
+            width: size.width,
+            height: size.height,
+        })
+    }
+
+    /// Returns the address of the specified OpenGL function, if it is supported by the
+    /// current OpenGL context.
+    ///
+    /// # Errors
+    /// Will return `Err` if a platform error occurs or if no current context has
+    /// been set.
+    ///
+    /// # Panics
+    /// Will panic if the `proc_name` argument contains a nul byte.
+    pub fn get_proc_address(
+        &self,
+        proc_name: &str,
+    ) -> Result<unsafe extern "C" fn(), Error>
+    {
+        let proc_name_c: Cow<CStr> = CStr::from_bytes_with_nul(proc_name.as_bytes())
+            .map(Cow::Borrowed)
+            .or_else(|_| CString::new(proc_name).map(Cow::Owned))
+            .expect("OpenGL function name contains a nul byte");
+
+        Ok(self.inner.get_proc_address(&proc_name_c)?)
+    }
+
+    /// Makes the OpenGL context of the window current for the calling thread.
+    ///
+    /// # Errors
+    /// Will return `Err` if a platform error occurs or if no OpenGL context is
+    /// present.
+    pub fn make_context_current(&self) -> Result<(), Error>
+    {
+        Ok(self.inner.make_context_current()?)
+    }
+
+    /// Sets the window's framebuffer size callback.
+    pub fn set_framebuffer_size_callback(&self, callback: impl Fn(Dimens<u32>) + 'static)
+    {
+        self.inner.set_framebuffer_size_callback(move |size| {
+            callback(Dimens {
+                width: size.width,
+                height: size.height,
+            });
+        });
+    }
+
+    /// Sets the window's key size callback.
+    pub fn set_key_callback(
+        &self,
+        callback: impl Fn(Key, i32, KeyState, KeyModifiers) + 'static,
+    )
+    {
+        self.inner.set_key_callback(callback);
+    }
+
+    /// Sets the window's cursor position callback.
+    pub fn set_cursor_pos_callback(&self, callback: impl Fn(Vec2<f64>) + 'static)
+    {
+        self.inner
+            .set_cursor_pos_callback(move |pos| callback(Vec2 { x: pos.x, y: pos.y }));
+    }
+
+    /// Sets the window's close callback.
+    pub fn set_close_callback(&self, callback: impl Fn() + 'static)
+    {
+        self.inner.set_close_callback(callback);
+    }
+}
+
+/// [`Window`] builder.
+#[derive(Debug, Clone, Default)]
+pub struct Builder
+{
+    inner: glfw::WindowBuilder,
+}
+
+impl Builder
+{
+    #[must_use]
+    pub fn creation_hint(mut self, creation_hint: CreationHint, value: i32) -> Self
+    {
+        self.inner = self.inner.hint(
+            match creation_hint {
+                CreationHint::OpenGLDebugContext => {
+                    glfw::window::Hint::OpenGLDebugContext
+                }
+            },
+            value,
+        );
+
+        self
+    }
+
+    /// Creates a new window.
+    ///
+    /// # Errors
+    /// Will return `Err` if the title contains a internal nul byte or if a platform error
+    /// occurs.
+    pub fn create(&self, size: Dimens<u32>, title: &str) -> Result<Window, Error>
+    {
+        let window = self.inner.create(
+            &WindowSize {
+                width: size.width,
+                height: size.height,
+            },
+            title,
+        )?;
+
+        Ok(Window { inner: window })
+    }
+}
+
+#[derive(Debug)]
+pub struct Extension
+{
+    window_builder: Builder,
+    window_size: Dimens<u32>,
+    window_title: String,
+}
+
+impl Extension
+{
+    #[must_use]
+    pub fn new(window_builder: Builder) -> Self
+    {
+        Self { window_builder, ..Default::default() }
+    }
+
+    #[must_use]
+    pub fn window_size(mut self, window_size: Dimens<u32>) -> Self
+    {
+        self.window_size = window_size;
+
+        self
+    }
+
+    #[must_use]
+    pub fn window_title(mut self, window_title: impl Into<String>) -> Self
+    {
+        self.window_title = window_title.into();
+
+        self
+    }
+}
+
+impl ecs::extension::Extension for Extension
+{
+    fn collect(self, mut collector: ExtensionCollector<'_>)
+    {
+        collector.add_system(StartEvent, initialize);
+        collector.add_system(PostPresentEvent, update);
+
+        let window = self
+            .window_builder
+            .create(self.window_size, &self.window_title)
+            .unwrap();
+
+        window.set_cursor_mode(CursorMode::Normal).unwrap();
+
+        collector.add_sole(window).ok();
+    }
+}
+
+impl Default for Extension
+{
+    fn default() -> Self
+    {
+        Self {
+            window_builder: Builder::default(),
+            window_size: Dimens { width: 1920, height: 1080 },
+            window_title: String::new(),
+        }
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+#[error(transparent)]
+pub struct Error(glfw::Error);
+
+impl From<glfw::Error> for Error
+{
+    fn from(err: glfw::Error) -> Self
+    {
+        Self(err)
+    }
+}
+
+fn initialize(window: Single<Window>, actions: Actions)
+{
+    let actions_weak_ref = actions.to_weak_ref();
+
+    window.set_close_callback(move || {
+        let actions_weak_ref = actions_weak_ref.clone();
+
+        let actions_ref = actions_weak_ref.access().expect("No world");
+
+        actions_ref.to_actions().stop();
+    });
+}
+
+fn update(window: Single<Window>)
+{
+    window
+        .swap_buffers()
+        .expect("Failed to swap window buffers");
+
+    window.poll_events().expect("Failed to poll window events");
+}