src/Device/Point.hpp

// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef Point_hpp
#define Point_hpp

namespace sw {

struct Vector;
struct Matrix;

struct Point
{
	Point();
	Point(const int i);
	Point(const Point &P);
	Point(const Vector &v);
	Point(float Px, float Py, float Pz);

	Point &operator=(const Point &P);

	union
	{
		float p[3];

		struct
		{
			float x;
			float y;
			float z;
		};
	};

	float &operator[](int i);
	float &operator()(int i);

	const float &operator[](int i) const;
	const float &operator()(int i) const;

	Point &operator+=(const Vector &v);
	Point &operator-=(const Vector &v);

	friend Point operator+(const Point &P, const Vector &v);
	friend Point operator-(const Point &P, const Vector &v);

	friend Vector operator-(const Point &P, const Point &Q);

	friend Point operator*(const Matrix &M, const Point &P);
	friend Point operator*(const Point &P, const Matrix &M);
	friend Point &operator*=(Point &P, const Matrix &M);

	float d(const Point &P) const;   // Distance between two points
	float d2(const Point &P) const;  // Squared distance between two points

	static float d(const Point &P, const Point &Q);   // Distance between two points
	static float d2(const Point &P, const Point &Q);  // Squared distance between two points
};

}  // namespace sw

#include "Vector.hpp"

namespace sw {

inline Point::Point()
{
}

inline Point::Point(const int i)
{
	const float s = (float)i;

	x = s;
	y = s;
	z = s;
}

inline Point::Point(const Point &P)
{
	x = P.x;
	y = P.y;
	z = P.z;
}

inline Point::Point(const Vector &v)
{
	x = v.x;
	y = v.y;
	z = v.z;
}

inline Point::Point(float P_x, float P_y, float P_z)
{
	x = P_x;
	y = P_y;
	z = P_z;
}

inline Point &Point::operator=(const Point &P)
{
	x = P.x;
	y = P.y;
	z = P.z;

	return *this;
}

inline float &Point::operator()(int i)
{
	return p[i];
}

inline float &Point::operator[](int i)
{
	return p[i];
}

inline const float &Point::operator()(int i) const
{
	return p[i];
}

inline const float &Point::operator[](int i) const
{
	return p[i];
}

}  // namespace sw

#endif  // Point_hpp