feat(glfw): add setting window creation hints

1 files changed, 50 insertions, 4 deletions

diff --git a/glfw/src/window.rs b/glfw/src/window.rs
index 5261eec..879d17e 100644
--- a/glfw/src/window.rs
+++ b/glfw/src/window.rs
@@ -129,14 +129,32 @@ impl Window
 
 /// [`Window`] builder.
 #[derive(Debug, Clone, Default)]
-pub struct Builder {}
+pub struct Builder
+{
+    hints: Vec<(Hint, i32)>,
+}
 
 impl Builder
 {
     #[must_use]
     pub fn new() -> Self
     {
-        Self {}
+        Self { hints: Vec::new() }
+    }
+
+    /// Adds a window creation hint to set.
+    #[must_use]
+    pub fn hint(mut self, hint: Hint, value: i32) -> Self
+    {
+        self.hints.push((hint, value));
+
+        self
+    }
+
+    /// Sets the window hints to set.
+    pub fn hints(mut self, hints: impl IntoIterator<Item = (Hint, i32)>)
+    {
+        self.hints = hints.into_iter().collect();
     }
 
     /// Creates a new window.
@@ -147,11 +165,22 @@ impl Builder
     /// - A GLFW error occurs
     pub fn create(&self, size: &Size, title: &str) -> Result<Window, Error>
     {
-        let init = initialize()?;
-
         let c_title =
             CString::new(title).map_err(|_| Error::InternalNulByteInWindowTitle)?;
 
+        let init = initialize()?;
+
+        for (hint, value) in &self.hints {
+            // SAFETY: The initialize function makes sure the current thread is the main
+            // thread
+            //
+            // Error is not checked for after since the two possible errors
+            // (GLFW_NOT_INITIALIZED and GLFW_INVALID_ENUM) cannot occur.
+            unsafe {
+                crate::ffi::glfwWindowHint(hint.to_glfw(), *value);
+            }
+        }
+
         // SAFETY: The initialize function makes sure the current thread is the main
         // thread
         let handle = unsafe {
@@ -174,6 +203,23 @@ impl Builder
     }
 }
 
+/// Window creation hint
+#[derive(Debug, Clone, Copy)]
+pub enum Hint
+{
+    OpenGLDebugContext,
+}
+
+impl Hint
+{
+    fn to_glfw(self) -> c_int
+    {
+        match self {
+            Self::OpenGLDebugContext => crate::ffi::GLFW_OPENGL_DEBUG_CONTEXT,
+        }
+    }
+}
+
 /// Window size.
 pub struct Size
 {