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/*
This file is part of Warzone 2100.
Copyright (C) 2007-2020 Warzone 2100 Project
Warzone 2100 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Warzone 2100 is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef VECTOR_H
#define VECTOR_H
#if defined(WZ_CC_MSVC)
#pragma warning( disable : 4201)
#endif
#define GLM_FORCE_SWIZZLE
#define GLM_FORCE_SILENT_WARNINGS
#include <stdint.h>
#include "wzglobal.h"
#include "frame.h"
#include "lib/framework/types.h"
#include <glm/vec2.hpp>
#include <glm/vec3.hpp>
using Vector3i = glm::ivec3;
using Vector2i = glm::ivec2;
using Vector2f = glm::vec2;
using Vector3f = glm::vec3;
struct Rotation
{
Rotation()
{
direction = 0;
pitch = 0;
roll = 0;
}
Rotation(int direction, int pitch, int roll) : direction((uint16_t)direction), pitch((uint16_t)pitch), roll((uint16_t)roll) {}
Rotation(Vector3i xyz) : direction((uint16_t)xyz.x), pitch((uint16_t)xyz.y), roll((uint16_t)xyz.z) {}
uint16_t direction, pitch, roll; ///< Object rotation in 0..64k range
};
typedef Vector3i Position; ///< Map position in world coordinates
static inline Vector3i toVector(Rotation const &r)
{
return Vector3i(r.direction, r.pitch, r.roll);
}
// vector * vector -> scalar
// Note: glm doesn't provide dot operator for integral vector.
static inline WZ_DECL_PURE int dot(Vector2i const &a, Vector2i const &b)
{
return a.x * b.x + a.y * b.y;
}
static inline WZ_DECL_PURE int dot(Vector3i const &a, Vector3i const &b)
{
return a.x * b.x + a.y * b.y + a.z * b.z;
}
// iSinCosR(angle, scalar) -> 2d_vector
static inline WZ_DECL_PURE Vector2i iSinCosR(uint16_t a, int32_t r)
{
return Vector2i(iSinR(a, r), iCosR(a, r));
}
// iAtan2(2d_vector) -> angle
static inline WZ_DECL_PURE int iAtan2(Vector2i const &a)
{
return iAtan2(a.x, a.y);
}
// iHypot(vector) -> scalar
static inline WZ_DECL_PURE int iHypot(Vector2i const &a)
{
return iHypot(a.x, a.y);
}
static inline WZ_DECL_PURE int iHypot(Vector3i const &a)
{
return iHypot3(a.x, a.y, a.z);
}
/*!
* Rotate v
* \param v vector to rotate
* \param angle the amount * 32768/π to rotate in counterclockwise direction
* \return Result
*/
static inline WZ_DECL_PURE Vector2f Vector2f_Rotate2f(Vector2f v, int angle)
{
Vector2f result;
result.x = (v.x * iCos((uint16_t)angle) - v.y * iSin((uint16_t)angle)) / 65536;
result.y = (v.x * iSin((uint16_t)angle) + v.y * iCos((uint16_t)angle)) / 65536;
return result;
}
/*!
* Much the same as Vector2i_InCircle except that it works in 3-axis by discarding the z-component and with
* circles.
* \param v Vector to test
* \param c Vector containing the centre of the circle
* \param r The radius of the circle
* \return If v falls within the circle
*/
static inline bool WZ_DECL_PURE Vector3i_InCircle(Vector3i v, Vector3i c, unsigned r)
{
Vector2i delta = Vector3i(v - c).xy();
// Explictily cast to "unsigned int" because this number never can be
// negative, due to the fact that these numbers are squared. Still GCC
// warns about a comparison of a comparison between an unsigned and a
// signed integer.
return (unsigned int)dot(delta, delta) < r * r;
}
/*!
* Much the same as Vector2i_InCircle except that it works in 3-axis and with
* spheres.
* The equation used is also ever so slightly different:
* (x - a)^2 + (y - b)^2 + (z - c)^2 = r^2. Notice how it is still squared and
* _not_ cubed!
* \param v Vector to test
* \param c Vector containing the centre of the sphere
* \param r The radius of the sphere
* \return If v falls within the sphere
*/
static inline bool WZ_DECL_PURE Vector3i_InSphere(Vector3i v, Vector3i c, unsigned r)
{
Vector3i delta = v - c;
// Explictily cast to "unsigned int" because this number never can be
// negative, due to the fact that these numbers are squared. Still GCC
// warns about a comparison of a comparison between an unsigned and a
// signed integer.
return (unsigned int)dot(delta, delta) < r * r;
}
// Round direction to nearest axis-aligned direction.
static inline uint16_t snapDirection(uint16_t direction)
{
return (direction + 0x2000) & 0xC000;
}
#endif // VECTOR_H
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