optimized function's name that they are deg2rad and rad2deg

inc/hgl/math/MathConst.h

@@ -46,15 +46,15 @@ namespace hgl
     /**
      * 角度转弧度
      */
-    inline double hgl_deg2rad(const double ang)
+    inline double deg2rad(const double deg)
     {
-        return ang*(HGL_PI/180.0f);
+        return deg*(HGL_PI/180.0f);
     }
 
     /**
      * 弧度转角度
      */
-    inline double hgl_rad2deg(const double rad)
+    inline double rad2deg(const double rad)
     {
         return rad*(180.0f/HGL_PI);
     }

src/Math/Matrix4f.cpp

@@ -78,7 +78,7 @@ namespace hgl
                             float znear,
                             float zfar)
     {
-        float f = 1.0f / tan( hgl_deg2rad( 0.5f * field_of_view ) );
+        float f = 1.0f / tan( deg2rad( 0.5f * field_of_view ) );
 
         return Matrix4f(
           f / aspect_ratio,