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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/*
* This file is based on, or a modified version of code from TinyGL (C) 1997-2022 Fabrice Bellard,
* which is licensed under the MIT license (see LICENSE).
* It also has modifications by the ResidualVM-team, which are covered under the GPLv2 (or later).
*/
#ifndef GRAPHICS_TINYGL_ZMATH_H
#define GRAPHICS_TINYGL_ZMATH_H
namespace TinyGL {
#define X _v[0]
#define Y _v[1]
#define Z _v[2]
#define W _v[3]
// Matrix & Vertex
class Vector3 {
public:
Vector3() { }
Vector3(float x, float y, float z) {
X = x;
Y = y;
Z = z;
}
void normalize();
float getLength() const { return sqrt(X * X + Y * Y + Z * Z); }
bool operator==(const Vector3 &other) const {
return X == other.X && Y == other.Y && Z == other.Z;
}
bool operator!=(const Vector3 &other) const {
return X != other.X || Y != other.Y || Z != other.Z;
}
Vector3 operator-() const {
return Vector3(-X, -Y, -Z);
}
Vector3 operator*(float factor) const {
return Vector3(X * factor, Y * factor, Z * factor);
}
Vector3 operator+(const Vector3 &other) const {
return Vector3(X + other.X, Y + other.Y, Z + other.Z);
}
Vector3 operator-(const Vector3 &other) const {
return Vector3(X - other.X, Y - other.Y, Z - other.Z);
}
Vector3 &operator*=(float factor) {
X *= factor;
Y *= factor;
Z *= factor;
return *this;
}
Vector3 &operator+=(float value) {
X += value;
Y += value;
Z += value;
return *this;
}
Vector3 &operator-=(float value) {
X -= value;
Y -= value;
Z -= value;
return *this;
}
float _v[3];
};
class Vector4 {
public:
Vector4() { }
Vector4(const Vector3 &vec, float w);
Vector4(float x, float y, float z, float w) {
X = x;
Y = y;
Z = z;
W = w;
}
bool operator==(const Vector4 &other) const {
return X == other.X && Y == other.Y && Z == other.Z && W == other.W;
}
bool operator!=(const Vector4 &other) const {
return X != other.X || Y != other.Y || Z != other.Z || W != other.W;
}
Vector4 operator-() const {
return Vector4(-X, -Y, -Z, -W);
}
Vector4 operator*(float factor) const {
return Vector4(X * factor, Y * factor, Z * factor,W * factor);
}
Vector4 operator+(const Vector4 &other) const {
return Vector4(X + other.X, Y + other.Y, Z + other.Z, W + other.W);
}
Vector4 operator-(const Vector4 &other) const {
return Vector4(X - other.X, Y - other.Y, Z - other.Z, W - other.W);
}
Vector4 &operator*=(float factor) {
X *= factor;
Y *= factor;
Z *= factor;
W *= factor;
return *this;
}
Vector4 &operator+=(float value) {
X += value;
Y += value;
Z += value;
W += value;
return *this;
}
Vector4 &operator-=(float value) {
X -= value;
Y -= value;
Z -= value;
W -= value;
return *this;
}
float _v[4];
};
class Matrix4 {
public:
Matrix4() { }
bool isIdentity() const;
inline Matrix4 operator+(const Matrix4 &b) const {
Matrix4 result;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
result._m[i][j] = _m[i][j] + b._m[i][j];
}
}
return result;
}
inline Matrix4 operator-(const Matrix4 &b) const {
Matrix4 result;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
result._m[i][j] = _m[i][j] - b._m[i][j];
}
}
return result;
}
inline Matrix4 operator*(const Matrix4 &b) const {
Matrix4 result;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
float s = 0.0;
for (int k = 0; k < 4; k++)
s += _m[i][k] * b._m[k][j];
result._m[i][j] = s;
}
}
return result;
}
inline Matrix4 &operator*=(const Matrix4 &b) {
Matrix4 a = *this;
float s;
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
s = 0.0;
for (int k = 0; k < 4; k++)
s += a._m[i][k] * b._m[k][j];
_m[i][j] = s;
}
}
return *this;
}
void scale(float x, float y, float z);
void translate(float x, float y, float z);
void identity();
void rotation(float t, int);
void invert();
void transpose();
Matrix4 transpose() const;
Matrix4 inverseOrtho() const;
Matrix4 inverse() const;
static Matrix4 frustum(float left, float right, float bottom, float top, float nearp, float farp);
inline void transform(const Vector3 &vector, Vector3 &out) const {
out.X = vector.X * _m[0][0] + vector.Y * _m[0][1] + vector.Z * _m[0][2] + _m[0][3];
out.Y = vector.X * _m[1][0] + vector.Y * _m[1][1] + vector.Z * _m[1][2] + _m[1][3];
out.Z = vector.X * _m[2][0] + vector.Y * _m[2][1] + vector.Z * _m[2][2] + _m[2][3];
}
// Transform the vector as if this were a 3x3 matrix.
inline void transform3x3(const Vector3 &vector, Vector3 &out) const {
out.X = vector.X * _m[0][0] + vector.Y * _m[0][1] + vector.Z * _m[0][2];
out.Y = vector.X * _m[1][0] + vector.Y * _m[1][1] + vector.Z * _m[1][2];
out.Z = vector.X * _m[2][0] + vector.Y * _m[2][1] + vector.Z * _m[2][2];
}
// Transform the vector as if this were a 3x3 matrix.
inline void transform3x3(const Vector4 &vector, Vector3 &out) const {
out.X = vector.X * _m[0][0] + vector.Y * _m[0][1] + vector.Z * _m[0][2];
out.Y = vector.X * _m[1][0] + vector.Y * _m[1][1] + vector.Z * _m[1][2];
out.Z = vector.X * _m[2][0] + vector.Y * _m[2][1] + vector.Z * _m[2][2];
}
// Transform the vector as if this were a 3x4 matrix.
inline void transform3x4(const Vector4 &vector, Vector4 &out) const {
out.X = vector.X * _m[0][0] + vector.Y * _m[0][1] + vector.Z * _m[0][2] + _m[0][3];
out.Y = vector.X * _m[1][0] + vector.Y * _m[1][1] + vector.Z * _m[1][2] + _m[1][3];
out.Z = vector.X * _m[2][0] + vector.Y * _m[2][1] + vector.Z * _m[2][2] + _m[2][3];
out.W = vector.X * _m[3][0] + vector.Y * _m[3][1] + vector.Z * _m[3][2] + _m[3][3];
}
inline void transform(const Vector4 &vector, Vector4 &out) const {
out.X = vector.X * _m[0][0] + vector.Y * _m[0][1] + vector.Z * _m[0][2] + vector.W * _m[0][3];
out.Y = vector.X * _m[1][0] + vector.Y * _m[1][1] + vector.Z * _m[1][2] + vector.W * _m[1][3];
out.Z = vector.X * _m[2][0] + vector.Y * _m[2][1] + vector.Z * _m[2][2] + vector.W * _m[2][3];
out.W = vector.X * _m[3][0] + vector.Y * _m[3][1] + vector.Z * _m[3][2] + vector.W * _m[3][3];
}
float _m[4][4];
};
} // end of namespace TinyGL
#endif
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