WIP: Working clip rects for glium

emigui/src/math.rs

@@ -63,6 +63,10 @@ impl Vec2 {
         vec2(self.x.ceil(), self.y.ceil())
     }
 
+    pub fn is_finite(&self) -> bool {
+        self.x.is_finite() && self.y.is_finite()
+    }
+
     pub fn min(self, other: Vec2) -> Self {
         vec2(self.x.min(other.x), self.y.min(other.y))
     }
@@ -195,6 +199,10 @@ impl Pos2 {
     pub fn ceil(self) -> Self {
         pos2(self.x.ceil(), self.y.ceil())
     }
+
+    pub fn is_finite(&self) -> bool {
+        self.x.is_finite() && self.y.is_finite()
+    }
 }
 
 impl std::ops::AddAssign<Vec2> for Pos2 {
@@ -342,6 +350,14 @@ impl Rect {
         self.max.y - self.min.y
     }
 
+    pub fn is_empty(&self) -> bool {
+        self.max.x < self.min.x || self.max.y < self.min.y
+    }
+
+    pub fn is_finite(&self) -> bool {
+        self.min.is_finite() && self.max.is_finite()
+    }
+
     // Convenience functions (assumes origin is towards left top):
 
     pub fn left_top(&self) -> Pos2 {