feat(glfw): add get mouse button input

1 files changed, 70 insertions, 0 deletions

diff --git a/glfw/src/window.rs b/glfw/src/window.rs
index 0c69a6b..bd8b78b 100644
--- a/glfw/src/window.rs
+++ b/glfw/src/window.rs
@@ -151,6 +151,35 @@ impl Window
         })
     }
 
+    /// Returns the last reported state of a mouse button.
+    ///
+    /// # Errors
+    /// Will return `Err` if a GLFW error occurs.
+    pub fn get_mouse_button(
+        &self,
+        mouse_button: MouseButton,
+    ) -> Result<MouseButtonState, Error>
+    {
+        // SAFETY: The initialize function (called when the window is created) makes sure
+        // the current thread is the main thread
+        let state = unsafe {
+            crate::ffi::glfwGetMouseButton(self.handle, mouse_button.into_raw())
+        };
+
+        get_glfw_error()?;
+
+        Ok(match state {
+            crate::ffi::GLFW_PRESS => MouseButtonState::Pressed,
+            crate::ffi::GLFW_RELEASE => MouseButtonState::Released,
+            _ => {
+                // SAFETY: glfwGetMouseButton can only return GLFW_PRESS or GLFW_RELEASE
+                unsafe {
+                    unreachable_unchecked();
+                }
+            }
+        })
+    }
+
     /// Returns the position of the cursor, in screen coordinates, relative to the
     /// upper-left corner of the content area of the window.
     ///
@@ -485,6 +514,47 @@ pub enum KeyState
     Released,
 }
 
+#[derive(Debug, Clone, Copy)]
+pub enum MouseButton
+{
+    One,
+    Two,
+    Three,
+    Four,
+    Five,
+    Six,
+    Seven,
+    Eight,
+}
+
+impl MouseButton
+{
+    pub const LEFT: Self = Self::One;
+    pub const MIDDLE: Self = Self::Three;
+    pub const RIGHT: Self = Self::Two;
+
+    fn into_raw(self) -> i32
+    {
+        match self {
+            Self::One => crate::ffi::GLFW_MOUSE_BUTTON_1,
+            Self::Two => crate::ffi::GLFW_MOUSE_BUTTON_2,
+            Self::Three => crate::ffi::GLFW_MOUSE_BUTTON_3,
+            Self::Four => crate::ffi::GLFW_MOUSE_BUTTON_4,
+            Self::Five => crate::ffi::GLFW_MOUSE_BUTTON_5,
+            Self::Six => crate::ffi::GLFW_MOUSE_BUTTON_6,
+            Self::Seven => crate::ffi::GLFW_MOUSE_BUTTON_7,
+            Self::Eight => crate::ffi::GLFW_MOUSE_BUTTON_8,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub enum MouseButtonState
+{
+    Pressed,
+    Released,
+}
+
 #[derive(Debug, Clone)]
 pub struct CursorPosition
 {