vec3: inline many methods for major performance improvement.

rtiow/vec3/src/vec3.rs

@@ -16,6 +16,7 @@ pub struct Vec3 {
 }
 
 // Return a `Vec3` with the lowest of each component in v1 or v2.
+#[inline]
 pub fn min(v1: Vec3, v2: Vec3) -> Vec3 {
     Vec3 {
         x: v1.x.min(v2.x),
@@ -24,6 +25,7 @@ pub fn min(v1: Vec3, v2: Vec3) -> Vec3 {
     }
 }
 // Return a `Vec3` with the greatest of each component in v1 or v2.
+#[inline]
 pub fn max(v1: Vec3, v2: Vec3) -> Vec3 {
     Vec3 {
         x: v1.x.max(v2.x),
@@ -32,6 +34,7 @@ pub fn max(v1: Vec3, v2: Vec3) -> Vec3 {
     }
 }
 
+#[inline]
 pub fn cross(v1: Vec3, v2: Vec3) -> Vec3 {
     Vec3 {
         x: v1.y * v2.z - v1.z * v2.y,
@@ -40,6 +43,7 @@ pub fn cross(v1: Vec3, v2: Vec3) -> Vec3 {
     }
 }
 
+#[inline]
 pub fn dot(v1: Vec3, v2: Vec3) -> f32 {
     v1.x * v2.x + v1.y * v2.y + v1.z * v2.z
 }
@@ -49,26 +53,32 @@ impl Vec3 {
         Vec3 { x, y, z }
     }
 
+    #[inline]
     pub fn min(self) -> f32 {
         self.x.min(self.y).min(self.z)
     }
 
+    #[inline]
     pub fn max(self) -> f32 {
         self.x.max(self.y).max(self.z)
     }
 
+    #[inline]
     pub fn length(self) -> f32 {
         self.squared_length().sqrt()
     }
 
+    #[inline]
     pub fn squared_length(self) -> f32 {
         self.x * self.x + self.y * self.y + self.z * self.z
     }
 
+    #[inline]
     pub fn unit_vector(self) -> Vec3 {
         self / self.length()
     }
 
+    #[inline]
     pub fn make_unit_vector(&mut self) {
         *self = self.unit_vector();
     }
@@ -111,6 +121,7 @@ impl str::FromStr for Vec3 {
 impl Add<f32> for Vec3 {
     type Output = Vec3;
 
+    #[inline]
     fn add(self, r: f32) -> Vec3 {
         Vec3 {
             x: self.x + r,
@@ -123,6 +134,7 @@ impl Add<f32> for Vec3 {
 impl Add for Vec3 {
     type Output = Vec3;
 
+    #[inline]
     fn add(self, r: Vec3) -> Vec3 {
         Vec3 {
             x: self.x + r.x,
@@ -135,6 +147,7 @@ impl Add for Vec3 {
 impl Div<Vec3> for Vec3 {
     type Output = Vec3;
 
+    #[inline]
     fn div(self, r: Vec3) -> Vec3 {
         Vec3 {
             x: self.x / r.x,
@@ -147,6 +160,7 @@ impl Div<Vec3> for Vec3 {
 impl Div<Vec3> for f32 {
     type Output = Vec3;
 
+    #[inline]
     fn div(self, r: Vec3) -> Vec3 {
         Vec3 {
             x: self / r.x,
@@ -159,6 +173,7 @@ impl Div<Vec3> for f32 {
 impl Div<f32> for Vec3 {
     type Output = Vec3;
 
+    #[inline]
     fn div(self, r: f32) -> Vec3 {
         Vec3 {
             x: self.x / r,
@@ -170,6 +185,7 @@ impl Div<f32> for Vec3 {
 
 impl Index<usize> for Vec3 {
     type Output = f32;
+    #[inline]
     fn index(&self, idx: usize) -> &f32 {
         match idx {
             0 => &self.x,
@@ -183,6 +199,7 @@ impl Index<usize> for Vec3 {
 impl Mul for Vec3 {
     type Output = Vec3;
 
+    #[inline]
     fn mul(self, r: Vec3) -> Vec3 {
         Vec3 {
             x: self.x * r.x,
@@ -195,6 +212,7 @@ impl Mul for Vec3 {
 impl Mul<Vec3> for f32 {
     type Output = Vec3;
 
+    #[inline]
     fn mul(self, v: Vec3) -> Vec3 {
         Vec3 {
             x: v.x * self,
@@ -207,6 +225,7 @@ impl Mul<Vec3> for f32 {
 impl Mul<f32> for Vec3 {
     type Output = Vec3;
 
+    #[inline]
     fn mul(self, r: f32) -> Vec3 {
         Vec3 {
             x: self.x * r,
@@ -219,6 +238,7 @@ impl Mul<f32> for Vec3 {
 impl Neg for Vec3 {
     type Output = Vec3;
 
+    #[inline]
     fn neg(self) -> Vec3 {
         -1. * self
     }
@@ -227,6 +247,7 @@ impl Neg for Vec3 {
 impl Sub for Vec3 {
     type Output = Vec3;
 
+    #[inline]
     fn sub(self, r: Vec3) -> Vec3 {
         Vec3 {
             x: self.x - r.x,