Merge pull request #2822 from wwylele/sw_lighting-2

Implement fragment lighting in the sw renderer (take 2)

src/common/quaternion.h

@@ -30,6 +30,11 @@ public:
         return {xyz * other.w + other.xyz * w + Cross(xyz, other.xyz),
                 w * other.w - Dot(xyz, other.xyz)};
     }
+
+    Quaternion<T> Normalized() const {
+        T length = std::sqrt(xyz.Length2() + w * w);
+        return {xyz / length, w / length};
+    }
 };
 
 template <typename T>

src/common/vector_math.h

@@ -31,7 +31,6 @@
 #pragma once
 
 #include <cmath>
-#include <type_traits>
 
 namespace Math {
 
@@ -90,7 +89,7 @@ public:
         x -= other.x;
         y -= other.y;
     }
-    template <typename Q = T, class = typename std::enable_if<std::is_signed<Q>::value>::type>
+
     Vec2<decltype(-T{})> operator-() const {
         return MakeVec(-x, -y);
     }
@@ -247,7 +246,7 @@ public:
         y -= other.y;
         z -= other.z;
     }
-    template <typename Q = T, class = typename std::enable_if<std::is_signed<Q>::value>::type>
+
     Vec3<decltype(-T{})> operator-() const {
         return MakeVec(-x, -y, -z);
     }
@@ -462,7 +461,7 @@ public:
         z -= other.z;
         w -= other.w;
     }
-    template <typename Q = T, class = typename std::enable_if<std::is_signed<Q>::value>::type>
+
     Vec4<decltype(-T{})> operator-() const {
         return MakeVec(-x, -y, -z, -w);
     }