151 lines
3.2 KiB
C++
151 lines
3.2 KiB
C++
// Copyright 2008 Dolphin Emulator Project
|
|
// Licensed under GPLv2+
|
|
// Refer to the license.txt file included.
|
|
|
|
#pragma once
|
|
|
|
#include <algorithm>
|
|
#include <array>
|
|
#include <cstdlib>
|
|
#include <vector>
|
|
|
|
#include "Common/CommonTypes.h"
|
|
|
|
#ifdef _MSC_VER
|
|
#include <intrin.h>
|
|
#endif
|
|
|
|
namespace MathUtil
|
|
{
|
|
constexpr double TAU = 6.2831853071795865;
|
|
constexpr double PI = TAU / 2;
|
|
|
|
template <class T>
|
|
constexpr T Clamp(const T val, const T& min, const T& max)
|
|
{
|
|
return std::max(min, std::min(max, val));
|
|
}
|
|
|
|
template <typename T>
|
|
constexpr bool IsPow2(T imm)
|
|
{
|
|
return imm > 0 && (imm & (imm - 1)) == 0;
|
|
}
|
|
|
|
constexpr u32 NextPowerOf2(u32 value)
|
|
{
|
|
--value;
|
|
value |= value >> 1;
|
|
value |= value >> 2;
|
|
value |= value >> 4;
|
|
value |= value >> 8;
|
|
value |= value >> 16;
|
|
++value;
|
|
|
|
return value;
|
|
}
|
|
|
|
template <class T>
|
|
struct Rectangle
|
|
{
|
|
T left{};
|
|
T top{};
|
|
T right{};
|
|
T bottom{};
|
|
|
|
constexpr Rectangle() = default;
|
|
|
|
constexpr Rectangle(T theLeft, T theTop, T theRight, T theBottom)
|
|
: left(theLeft), top(theTop), right(theRight), bottom(theBottom)
|
|
{
|
|
}
|
|
|
|
constexpr bool operator==(const Rectangle& r) const
|
|
{
|
|
return left == r.left && top == r.top && right == r.right && bottom == r.bottom;
|
|
}
|
|
|
|
T GetWidth() const { return abs(right - left); }
|
|
T GetHeight() const { return abs(bottom - top); }
|
|
// If the rectangle is in a coordinate system with a lower-left origin, use
|
|
// this Clamp.
|
|
void ClampLL(T x1, T y1, T x2, T y2)
|
|
{
|
|
left = Clamp(left, x1, x2);
|
|
right = Clamp(right, x1, x2);
|
|
top = Clamp(top, y2, y1);
|
|
bottom = Clamp(bottom, y2, y1);
|
|
}
|
|
|
|
// If the rectangle is in a coordinate system with an upper-left origin,
|
|
// use this Clamp.
|
|
void ClampUL(T x1, T y1, T x2, T y2)
|
|
{
|
|
left = Clamp(left, x1, x2);
|
|
right = Clamp(right, x1, x2);
|
|
top = Clamp(top, y1, y2);
|
|
bottom = Clamp(bottom, y1, y2);
|
|
}
|
|
};
|
|
|
|
} // namespace MathUtil
|
|
|
|
float MathFloatVectorSum(const std::vector<float>&);
|
|
|
|
// Rounds down. 0 -> undefined
|
|
inline int IntLog2(u64 val)
|
|
{
|
|
#if defined(__GNUC__)
|
|
return 63 - __builtin_clzll(val);
|
|
|
|
#elif defined(_MSC_VER)
|
|
unsigned long result = ULONG_MAX;
|
|
_BitScanReverse64(&result, val);
|
|
return result;
|
|
|
|
#else
|
|
int result = -1;
|
|
while (val != 0)
|
|
{
|
|
val >>= 1;
|
|
++result;
|
|
}
|
|
return result;
|
|
#endif
|
|
}
|
|
|
|
// Tiny matrix/vector library.
|
|
// Used for things like Free-Look in the gfx backend.
|
|
|
|
class Matrix33
|
|
{
|
|
public:
|
|
static void LoadIdentity(Matrix33& mtx);
|
|
|
|
// set mtx to be a rotation matrix around the x axis
|
|
static void RotateX(Matrix33& mtx, float rad);
|
|
// set mtx to be a rotation matrix around the y axis
|
|
static void RotateY(Matrix33& mtx, float rad);
|
|
|
|
// set result = a x b
|
|
static void Multiply(const Matrix33& a, const Matrix33& b, Matrix33& result);
|
|
static void Multiply(const Matrix33& a, const float vec[3], float result[3]);
|
|
|
|
float data[9];
|
|
};
|
|
|
|
class Matrix44
|
|
{
|
|
public:
|
|
static void LoadIdentity(Matrix44& mtx);
|
|
static void LoadMatrix33(Matrix44& mtx, const Matrix33& m33);
|
|
static void Set(Matrix44& mtx, const float mtxArray[16]);
|
|
|
|
static void Translate(Matrix44& mtx, const float vec[3]);
|
|
static void Shear(Matrix44& mtx, const float a, const float b = 0);
|
|
|
|
static void Multiply(const Matrix44& a, const Matrix44& b, Matrix44& result);
|
|
|
|
float data[16];
|
|
};
|