Make Basis look column-major while retaining a row-major representation

Per https://github.com/godotengine/godot/issues/14553:
Godot stores Basis in row-major layout for more change for efficiently
taking advantage of SIMD instructions, but in scripts Basis looks like and
is accessible in a column-major format.

This change modifies the C++ binding so that from the script's perspective
Basis does look like if it was column-major while retaining a row-major
in-memory representation. This is achieved using a set of helper template
classes which allow accessing individual columns whose components are
non-continues in memory as if it was a Vector3 type. This ensures script
interface compatibility without needing to transpose the Basis every time
it is passed over the script-engine boundary.

Also made most of the Vector2 and Vector3 class interfaces inlined in the
process for increased performance.

While unrelated (but didn't want to file a separate PR for it), this change
adds the necessary flags to have debug symbol information under MSVC.

Fixes #241.

1 files changed, 141 insertions, 43 deletions

diff --git a/include/core/Vector2.hpp b/include/core/Vector2.hpp
index 190217d..26e9b63 100644
--- a/include/core/Vector2.hpp
+++ b/include/core/Vector2.hpp
@@ -5,6 +5,8 @@
 
 #include "Defs.hpp"
 
+#include <cmath>
+
 namespace godot {
 
 class String;
@@ -20,36 +22,75 @@ struct Vector2 {
 		real_t height;
 	};
 
+	inline Vector2(real_t p_x, real_t p_y) {
+		x = p_x;
+		y = p_y;
+	}
+
+	inline Vector2() {
+		x = 0;
+		y = 0;
+	}
+
 	inline real_t &operator[](int p_idx) {
 		return p_idx ? y : x;
 	}
+
 	inline const real_t &operator[](int p_idx) const {
 		return p_idx ? y : x;
 	}
 
-	Vector2 operator+(const Vector2 &p_v) const;
+	inline Vector2 operator+(const Vector2 &p_v) const {
+		return Vector2(x + p_v.x, y + p_v.y);
+	}
 
-	void operator+=(const Vector2 &p_v);
+	inline void operator+=(const Vector2 &p_v) {
+		x += p_v.x;
+		y += p_v.y;
+	}
 
-	Vector2 operator-(const Vector2 &p_v) const;
+	inline Vector2 operator-(const Vector2 &p_v) const {
+		return Vector2(x - p_v.x, y - p_v.y);
+	}
 
-	void operator-=(const Vector2 &p_v);
+	inline void operator-=(const Vector2 &p_v) {
+		x -= p_v.x;
+		y -= p_v.y;
+	}
 
-	Vector2 operator*(const Vector2 &p_v1) const;
+	inline Vector2 operator*(const Vector2 &p_v1) const {
+		return Vector2(x * p_v1.x, y * p_v1.y);
+	}
 
-	Vector2 operator*(const real_t &rvalue) const;
+	inline Vector2 operator*(const real_t &rvalue) const {
+		return Vector2(x * rvalue, y * rvalue);
+	}
 
-	void operator*=(const real_t &rvalue);
+	inline void operator*=(const real_t &rvalue) {
+		x *= rvalue;
+		y *= rvalue;
+	}
 
-	inline void operator*=(const Vector2 &rvalue) { *this = *this * rvalue; }
+	inline void operator*=(const Vector2 &rvalue) {
+		*this = *this * rvalue;
+	}
 
-	Vector2 operator/(const Vector2 &p_v1) const;
+	inline Vector2 operator/(const Vector2 &p_v1) const {
+		return Vector2(x / p_v1.x, y / p_v1.y);
+	}
 
-	Vector2 operator/(const real_t &rvalue) const;
+	inline Vector2 operator/(const real_t &rvalue) const {
+		return Vector2(x / rvalue, y / rvalue);
+	}
 
-	void operator/=(const real_t &rvalue);
+	inline void operator/=(const real_t &rvalue) {
+		x /= rvalue;
+		y /= rvalue;
+	}
 
-	Vector2 operator-() const;
+	inline Vector2 operator-() const {
+		return Vector2(-x, -y);
+	}
 
 	bool operator==(const Vector2 &p_vec2) const;
 
@@ -58,23 +99,56 @@ struct Vector2 {
 	inline bool operator<(const Vector2 &p_vec2) const { return (x == p_vec2.x) ? (y < p_vec2.y) : (x < p_vec2.x); }
 	inline bool operator<=(const Vector2 &p_vec2) const { return (x == p_vec2.x) ? (y <= p_vec2.y) : (x <= p_vec2.x); }
 
-	void normalize();
+	inline void normalize() {
+		real_t l = x * x + y * y;
+		if (l != 0) {
+			l = sqrt(l);
+			x /= l;
+			y /= l;
+		}
+	}
 
-	Vector2 normalized() const;
+	inline Vector2 normalized() const {
+		Vector2 v = *this;
+		v.normalize();
+		return v;
+	}
 
-	real_t length() const;
-	real_t length_squared() const;
+	inline real_t length() const {
+		return sqrt(x * x + y * y);
+	}
 
-	real_t distance_to(const Vector2 &p_vector2) const;
-	real_t distance_squared_to(const Vector2 &p_vector2) const;
+	inline real_t length_squared() const {
+		return x * x + y * y;
+	}
 
-	real_t angle_to(const Vector2 &p_vector2) const;
-	real_t angle_to_point(const Vector2 &p_vector2) const;
+	inline real_t distance_to(const Vector2 &p_vector2) const {
+		return sqrt((x - p_vector2.x) * (x - p_vector2.x) + (y - p_vector2.y) * (y - p_vector2.y));
+	}
 
-	real_t dot(const Vector2 &p_other) const;
+	inline real_t distance_squared_to(const Vector2 &p_vector2) const {
+		return (x - p_vector2.x) * (x - p_vector2.x) + (y - p_vector2.y) * (y - p_vector2.y);
+	}
 
-	real_t cross(const Vector2 &p_other) const;
-	Vector2 cross(real_t p_other) const;
+	inline real_t angle_to(const Vector2 &p_vector2) const {
+		return atan2(cross(p_vector2), dot(p_vector2));
+	}
+
+	inline real_t angle_to_point(const Vector2 &p_vector2) const {
+		return atan2(y - p_vector2.y, x - p_vector2.x);
+	}
+
+	inline real_t dot(const Vector2 &p_other) const {
+		return x * p_other.x + y * p_other.y;
+	}
+
+	inline real_t cross(const Vector2 &p_other) const {
+		return x * p_other.y - y * p_other.x;
+	}
+
+	inline Vector2 cross(real_t p_other) const {
+		return Vector2(p_other * y, -p_other * x);
+	}
 
 	Vector2 project(const Vector2 &p_vec) const;
 
@@ -82,39 +156,63 @@ struct Vector2 {
 
 	Vector2 clamped(real_t p_len) const;
 
-	static Vector2 linear_interpolate(const Vector2 &p_a, const Vector2 &p_b, real_t p_t);
+	static inline Vector2 linear_interpolate(const Vector2 &p_a, const Vector2 &p_b, real_t p_t) {
+		Vector2 res = p_a;
+		res.x += (p_t * (p_b.x - p_a.x));
+		res.y += (p_t * (p_b.y - p_a.y));
+		return res;
+	}
+
+	inline Vector2 linear_interpolate(const Vector2 &p_b, real_t p_t) const {
+		Vector2 res = *this;
+		res.x += (p_t * (p_b.x - x));
+		res.y += (p_t * (p_b.y - y));
+		return res;
+	}
 
-	Vector2 linear_interpolate(const Vector2 &p_b, real_t p_t) const;
 	Vector2 cubic_interpolate(const Vector2 &p_b, const Vector2 &p_pre_a, const Vector2 &p_post_b, real_t p_t) const;
 
-	Vector2 slide(const Vector2 &p_vec) const;
+	inline Vector2 slide(const Vector2 &p_vec) const {
+		return p_vec - *this * this->dot(p_vec);
+	}
+
+	inline Vector2 reflect(const Vector2 &p_vec) const {
+		return p_vec - *this * this->dot(p_vec) * 2.0;
+	}
+
+	inline real_t angle() const {
+		return atan2(y, x);
+	}
 
-	Vector2 reflect(const Vector2 &p_vec) const;
+	inline void set_rotation(real_t p_radians) {
+		x = cosf(p_radians);
+		y = sinf(p_radians);
+	}
 
-	real_t angle() const;
+	inline Vector2 abs() const {
+		return Vector2(fabs(x), fabs(y));
+	}
 
-	void set_rotation(real_t p_radians);
+	inline Vector2 rotated(real_t p_by) const {
+		Vector2 v;
+		v.set_rotation(angle() + p_by);
+		v *= length();
+		return v;
+	}
 
-	Vector2 abs() const;
-	Vector2 rotated(real_t p_by) const;
+	inline Vector2 tangent() const {
+		return Vector2(y, -x);
+	}
 
-	Vector2 tangent() const;
+	inline Vector2 floor() const {
+		return Vector2(::floor(x), ::floor(y));
+	}
 
-	Vector2 floor() const;
+	inline Vector2 snapped(const Vector2 &p_by) const;
 
-	Vector2 snapped(const Vector2 &p_by) const;
 	inline real_t aspect() const { return width / height; }
 
 	operator String() const;
-
-	inline Vector2(real_t p_x, real_t p_y) {
-		x = p_x;
-		y = p_y;
-	}
-	inline Vector2() {
-		x = 0;
-		y = 0;
-	}
 };
 
 inline Vector2 operator*(real_t p_scalar, const Vector2 &p_vec) {