367 lines
9.0 KiB
C
367 lines
9.0 KiB
C
/*
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This file is part of Warzone 2100.
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Copyright (C) 2007 Warzone Resurrection Project
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Warzone 2100 is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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Warzone 2100 is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Warzone 2100; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __INCLUDED_LIB_IVIS_PIEVECTOR_H__
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#define __INCLUDED_LIB_IVIS_PIEVECTOR_H__
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#include "lib/framework/wzglobal.h"
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#if defined(WZ_CC_MSVC)
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// Prevent nasty "nonstandard extension used : non-constant aggregate initializer" warning when using MSVC
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# pragma warning(disable:4204)
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#endif
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typedef struct { int x, y; } Vector2i;
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typedef struct { float x, y; } Vector2f;
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typedef struct { int x, y, z; } Vector3i;
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typedef struct { float x, y, z; } Vector3f;
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typedef struct { uint16_t x, y, z; } Vector3uw; //Only used for basedef.h BASE_ELEMENTS1.
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/*!
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* Convert a integer vector to float
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* \param v Vector to convert
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* \return Float vector
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector2f Vector2i_To2f(const Vector2i v)
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{
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Vector2f dest = { (float)v.x, (float)v.y };
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return dest;
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}
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/*!
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* Add op2 to op1.
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* \param[in] op1,op2 Operands
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* \return Result
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector2i Vector2i_Add(const Vector2i op1, const Vector2i op2)
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{
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Vector2i dest = {
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op1.x + op2.x,
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op1.y + op2.y
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};
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return dest;
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}
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/*!
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* Substract op2 from op1.
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* \param op1,op2 Operands
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* \return Result
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector2i Vector2i_Sub(const Vector2i op1, const Vector2i op2)
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{
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Vector2i dest = {
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op1.x - op2.x,
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op1.y - op2.y
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};
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return dest;
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}
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/*!
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* Multiply a vector with a scalar.
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* \param v Vector
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* \param s Scalar
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* \return Product
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector2i Vector2i_Mult(const Vector2i v, const float s)
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{
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Vector2i dest = { v.x * s, v.y * s };
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return dest;
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}
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/*!
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* Calculate the scalar product of op1 and op2.
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* \param op1,op2 Operands
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* \return Scalarproduct of the 2 vectors
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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int Vector2i_ScalarP(const Vector2i op1, const Vector2i op2)
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{
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return op1.x * op2.x + op1.y * op2.y;
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}
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/*!
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* Calculate the length of a vector.
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* \param v Vector
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* \return Length
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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int Vector2i_Length(const Vector2i v)
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{
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return sqrtf( (float)Vector2i_ScalarP(v, v) );
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}
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/*!
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* Checks to see if vector v is inside the circle whose centre is at point c
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* with a radius of r.
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* This function makes use of the following equation:
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* (x - a)^2 + (y - b)^2 = r^2 which is used for drawing a circle of radius r
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* with a centre (a, b). However we can also use it to see if a point is in a
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* circle, which is the case so long as RHS > LHS.
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* \param v Vector to test
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* \param c Vector containing the centre of the circle
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* \param r The radius of the circle
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* \return If v falls within the circle
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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BOOL Vector2i_InCircle(const Vector2i v, const Vector2i c, const unsigned int r)
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{
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Vector2i delta = Vector2i_Sub(v, c);
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// Explictily cast to "unsigned int" because this number never can be
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// negative, due to the fact that these numbers are squared. Still GCC
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// warns about a comparison of a comparison between an unsigned and a
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// signed integer.
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return (unsigned int)((delta.x * delta.x) + (delta.y * delta.y)) < (r * r);
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}
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/*!
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* Create a Vector from x and y
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* \param x,y Coordinates
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* \return New Vector
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector2f Vector2f_New(const float x, const float y)
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{
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Vector2f dest = { x, y };
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return dest;
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}
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/*!
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* Add op2 to op1.
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* \param op1,op2 Operands
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* \return Result
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector2f Vector2f_Add(const Vector2f op1, const Vector2f op2)
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{
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Vector2f dest = {
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op1.x + op2.x,
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op1.y + op2.y
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};
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return dest;
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}
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/*!
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* Substract op2 from op1.
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* \param op1,op2 Operands
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* \return Result
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector2f Vector2f_Sub(const Vector2f op1, const Vector2f op2)
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{
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Vector2f dest = {
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op1.x - op2.x,
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op1.y - op2.y
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};
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return dest;
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}
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/*!
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* Multiply a vector with a scalar.
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* \param v Vector
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* \param s Scalar
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* \return Product
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector2f Vector2f_Mult(const Vector2f v, const float s)
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{
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Vector2f dest = { v.x * s, v.y * s };
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return dest;
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}
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/*!
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* Calculate the scalar product of op1 and op2.
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* \param op1,op2 Operands
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* \return Scalarproduct of the 2 vectors
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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float Vector2f_ScalarP(const Vector2f op1, const Vector2f op2)
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{
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return op1.x * op2.x + op1.y * op2.y;
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}
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/*!
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* Calculate the length of a vector.
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* \param v Vector
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* \return Length
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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float Vector2f_Length(const Vector2f v)
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{
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return sqrtf( Vector2f_ScalarP(v, v) );
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}
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/*!
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* Normalise a Vector
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* \param v Vector
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* \return Normalised vector, nullvector when input was nullvector or very small
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector2f Vector2f_Normalise(const Vector2f v)
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{
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float length = Vector2f_Length(v);
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if (length == 0.0f)
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{
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Vector2f dest = { 0.0f, 0.0f };
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return dest;
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}
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else
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{
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Vector2f dest = { v.x / length, v.y / length };
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return dest;
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}
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}
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/*!
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* Set the vector field by field, same as v = (Vector3f){x, y, z};
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* Needed for MSVC which doesn't support C99 struct assignments.
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* \param[out] v Vector to set
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* \param[in] x,y,z Values to set to
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*/
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static inline void Vector3f_Set(Vector3f* v, const float x, const float y, const float z)
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{
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v->x = x;
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v->y = y;
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v->z = z;
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}
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/*!
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* Add op2 to op1.
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* \param op1,op2 Operands
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* \return Result
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector3f Vector3f_Add(const Vector3f op1, const Vector3f op2)
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{
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Vector3f dest = {
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op1.x + op2.x,
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op1.y + op2.y,
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op1.z + op2.z
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};
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return dest;
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}
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/*!
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* Substract op2 from op1.
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* \param op1,op2 Operands
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* \return Result
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector3f Vector3f_Sub(const Vector3f op1, const Vector3f op2)
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{
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Vector3f dest = {
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op1.x - op2.x,
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op1.y - op2.y,
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op1.z - op2.z
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};
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return dest;
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}
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/*!
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* Calculate the scalar product of op1 and op2.
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* \param op1,op2 Operands
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* \return Scalarproduct of the 2 vectors
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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float Vector3f_ScalarP(const Vector3f op1, const Vector3f op2)
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{
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return op1.x * op2.x + op1.y * op2.y + op1.z * op2.z;
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}
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/*!
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* Calculate the crossproduct of op1 and op2.
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* \param op1,op2 Operands
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* \return Crossproduct
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector3f Vector3f_CrossP(const Vector3f op1, const Vector3f op2)
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{
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Vector3f dest = {
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op1.y * op2.z - op1.z * op2.y,
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op1.z * op2.x - op1.x * op2.z,
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op1.x * op2.y - op1.y * op2.x
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};
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return dest;
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}
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/*!
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* Substract op2 from op1.
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* \param op1,op2 Operands
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* \return Result
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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Vector3i Vector3i_Sub(const Vector3i op1, const Vector3i op2)
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{
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Vector3i dest = {
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op1.x - op2.x,
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op1.y - op2.y,
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op1.z - op2.z
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};
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return dest;
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}
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/*!
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* Much the same as Vector2i_InCircle except that it works in 3-axis and with
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* spheres.
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* The equation used is also ever so slightly different:
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* (x - a)^2 + (y - b)^2 + (z - c)^2 = r^2. Notice how it is still squared and
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* _not_ cubed!
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* \param v Vector to test
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* \param c Vector containing the centre of the sphere
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* \param r The radius of the sphere
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* \return If v falls within the sphere
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*/
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static inline WZ_DECL_CONST WZ_DECL_WARN_UNUSED_RESULT
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BOOL Vector3i_InSphere (const Vector3i v, const Vector3i c, const unsigned int r)
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{
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Vector3i delta = Vector3i_Sub(v, c);
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// Explictily cast to "unsigned int" because this number never can be
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// negative, due to the fact that these numbers are squared. Still GCC
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// warns about a comparison of a comparison between an unsigned and a
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// signed integer.
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return (unsigned int)((delta.x * delta.x) + (delta.y * delta.y) + (delta.z * delta.z)) < (r * r);
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}
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#endif // __INCLUDED_LIB_IVIS_PIEVECTOR_H__
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