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#include "mons_math/mat4.h"
#include "mons_math/mat3.h"
#include "mons_math/vec4.h"
#include <stdio.h>
mons_mat4 mons_mat4_add(mons_mat4 a, mons_mat4 b) {
mons_mat4 result = {
mons_vec4_add(a.m1, b.m1),
mons_vec4_add(a.m2, b.m2),
mons_vec4_add(a.m3, b.m3),
mons_vec4_add(a.m4, b.m4),
};
return result;
}
void mons_mat4_add_inplace(mons_mat4 *a, mons_mat4 b) {
mons_vec4_add_inplace(&a->m1, b.m1);
mons_vec4_add_inplace(&a->m2, b.m2);
mons_vec4_add_inplace(&a->m3, b.m3);
mons_vec4_add_inplace(&a->m4, b.m4);
}
mons_mat4 mons_mat4_mul_f(mons_mat4 a, float b) {
mons_mat4 result = {
mons_vec4_mul_f(a.m1, b),
mons_vec4_mul_f(a.m2, b),
mons_vec4_mul_f(a.m3, b),
mons_vec4_mul_f(a.m4, b),
};
return result;
}
mons_mat4 mons_mat4_mul_i(mons_mat4 a, int b) {
mons_mat4 result = {
mons_vec4_mul_i(a.m1, b),
mons_vec4_mul_i(a.m2, b),
mons_vec4_mul_i(a.m3, b),
mons_vec4_mul_i(a.m4, b),
};
return result;
}
void mons_mat4_mul_f_inplace(mons_mat4 *a, float b) {
mons_vec4_mul_f_inplace(&a->m1, b);
mons_vec4_mul_f_inplace(&a->m2, b);
mons_vec4_mul_f_inplace(&a->m3, b);
mons_vec4_mul_f_inplace(&a->m4, b);
}
void mons_mat4_mul_i_inplace(mons_mat4 *a, int b) {
mons_vec4_mul_i_inplace(&a->m1, b);
mons_vec4_mul_i_inplace(&a->m2, b);
mons_vec4_mul_i_inplace(&a->m3, b);
mons_vec4_mul_i_inplace(&a->m4, b);
}
mons_mat4 mons_mat4_mul(mons_mat4 a, mons_mat4 b) {
mons_vec4 b_n1 = mons_mat4_n1(b);
mons_vec4 b_n2 = mons_mat4_n2(b);
mons_vec4 b_n3 = mons_mat4_n3(b);
mons_vec4 b_n4 = mons_mat4_n4(b);
mons_mat4 result = {
{
mons_vec4_dot(a.m1, b_n1),
mons_vec4_dot(a.m1, b_n2),
mons_vec4_dot(a.m1, b_n3),
mons_vec4_dot(a.m1, b_n4),
},
{
mons_vec4_dot(a.m2, b_n1),
mons_vec4_dot(a.m2, b_n2),
mons_vec4_dot(a.m2, b_n3),
mons_vec4_dot(a.m2, b_n4),
},
{
mons_vec4_dot(a.m3, b_n1),
mons_vec4_dot(a.m3, b_n2),
mons_vec4_dot(a.m3, b_n3),
mons_vec4_dot(a.m3, b_n4),
},
{
mons_vec4_dot(a.m4, b_n1),
mons_vec4_dot(a.m4, b_n2),
mons_vec4_dot(a.m4, b_n3),
mons_vec4_dot(a.m4, b_n4),
},
};
return result;
}
mons_mat4 mons_mat4_transpose(mons_mat4 a) {
mons_mat4 result = {
mons_mat4_n1(a),
mons_mat4_n2(a),
mons_mat4_n3(a),
mons_mat4_n4(a),
};
return result;
}
void mons_mat4_transpose_inplace(mons_mat4 *a) { *a = mons_mat4_transpose(*a); }
mons_vec4 mons_mat4_n1(mons_mat4 a) {
mons_vec4 result = {
a.m1.x,
a.m2.x,
a.m3.x,
a.m4.x,
};
return result;
}
mons_vec4 mons_mat4_n2(mons_mat4 a) {
mons_vec4 result = {
a.m1.y,
a.m2.y,
a.m3.y,
a.m4.y,
};
return result;
}
mons_vec4 mons_mat4_n3(mons_mat4 a) {
mons_vec4 result = {
a.m1.z,
a.m2.z,
a.m3.z,
a.m4.z,
};
return result;
}
mons_vec4 mons_mat4_n4(mons_mat4 a) {
mons_vec4 result = {
a.m1.w,
a.m2.w,
a.m3.w,
a.m4.w,
};
return result;
}
float mons_mat4_determinant(mons_mat4 a) {
mons_mat3 minor_1_1 = {
{a.m2.y, a.m2.z, a.m2.w},
{a.m3.y, a.m3.z, a.m3.w},
{a.m4.y, a.m4.z, a.m4.w},
};
mons_mat3 minor_1_2 = {
{a.m2.x, a.m2.z, a.m2.w},
{a.m3.x, a.m3.z, a.m3.w},
{a.m4.x, a.m4.z, a.m4.w},
};
mons_mat3 minor_1_3 = {
{a.m2.x, a.m2.y, a.m2.w},
{a.m3.x, a.m3.y, a.m3.w},
{a.m4.x, a.m4.y, a.m4.w},
};
mons_mat3 minor_1_4 = {
{a.m2.x, a.m2.y, a.m2.z},
{a.m3.x, a.m3.y, a.m3.z},
{a.m4.x, a.m4.y, a.m4.z},
};
return (a.m1.x * mons_mat3_determinant(minor_1_1)) -
(a.m1.y * mons_mat3_determinant(minor_1_2)) +
(a.m1.z * mons_mat3_determinant(minor_1_3)) -
(a.m1.w * mons_mat3_determinant(minor_1_4));
}
mons_mat4 mons_mat4_minor(mons_mat4 a) {
// First Row
mons_mat3 minor_1_1 = {
{a.m2.y, a.m2.z, a.m2.w},
{a.m3.y, a.m3.z, a.m3.w},
{a.m4.y, a.m4.z, a.m4.w},
};
float det_1_1 = mons_mat3_determinant(minor_1_1);
mons_mat3 minor_1_2 = {
{a.m2.x, a.m2.z, a.m2.w},
{a.m3.x, a.m3.z, a.m3.w},
{a.m4.x, a.m4.z, a.m4.w},
};
float det_1_2 = mons_mat3_determinant(minor_1_2);
mons_mat3 minor_1_3 = {
{a.m2.x, a.m2.y, a.m2.w},
{a.m3.x, a.m3.y, a.m3.w},
{a.m4.x, a.m4.y, a.m4.w},
};
float det_1_3 = mons_mat3_determinant(minor_1_3);
mons_mat3 minor_1_4 = {
{a.m2.x, a.m2.y, a.m2.z},
{a.m3.x, a.m3.y, a.m3.z},
{a.m4.x, a.m4.y, a.m4.z},
};
float det_1_4 = mons_mat3_determinant(minor_1_4);
// Second Row
mons_mat3 minor_2_1 = {
{a.m1.y, a.m1.z, a.m1.w},
{a.m3.y, a.m3.z, a.m3.w},
{a.m4.y, a.m4.z, a.m4.w},
};
float det_2_1 = mons_mat3_determinant(minor_2_1);
mons_mat3 minor_2_2 = {
{a.m1.x, a.m1.z, a.m1.w},
{a.m3.x, a.m3.z, a.m3.w},
{a.m4.x, a.m4.z, a.m4.w},
};
float det_2_2 = mons_mat3_determinant(minor_2_2);
mons_mat3 minor_2_3 = {
{a.m1.x, a.m1.y, a.m1.w},
{a.m3.x, a.m3.y, a.m3.w},
{a.m4.x, a.m4.y, a.m4.w},
};
float det_2_3 = mons_mat3_determinant(minor_2_3);
mons_mat3 minor_2_4 = {
{a.m1.x, a.m1.y, a.m1.z},
{a.m3.x, a.m3.y, a.m3.z},
{a.m4.x, a.m4.y, a.m4.z},
};
float det_2_4 = mons_mat3_determinant(minor_2_4);
// Third Row
mons_mat3 minor_3_1 = {
{a.m1.y, a.m1.z, a.m1.w},
{a.m2.y, a.m2.z, a.m2.w},
{a.m4.y, a.m4.z, a.m4.w},
};
float det_3_1 = mons_mat3_determinant(minor_3_1);
mons_mat3 minor_3_2 = {
{a.m1.x, a.m1.z, a.m1.w},
{a.m2.x, a.m2.z, a.m2.w},
{a.m4.x, a.m4.z, a.m4.w},
};
float det_3_2 = mons_mat3_determinant(minor_3_2);
mons_mat3 minor_3_3 = {
{a.m1.x, a.m1.y, a.m1.w},
{a.m2.x, a.m2.y, a.m2.w},
{a.m4.x, a.m4.y, a.m4.w},
};
float det_3_3 = mons_mat3_determinant(minor_3_3);
mons_mat3 minor_3_4 = {
{a.m1.x, a.m1.y, a.m1.z},
{a.m2.x, a.m2.y, a.m2.z},
{a.m4.x, a.m4.y, a.m4.z},
};
float det_3_4 = mons_mat3_determinant(minor_3_4);
// Fourth Row
mons_mat3 minor_4_1 = {
{a.m1.y, a.m1.z, a.m1.w},
{a.m2.y, a.m2.z, a.m2.w},
{a.m3.y, a.m3.z, a.m3.w},
};
float det_4_1 = mons_mat3_determinant(minor_4_1);
mons_mat3 minor_4_2 = {
{a.m1.x, a.m1.z, a.m1.w},
{a.m2.x, a.m2.z, a.m2.w},
{a.m3.x, a.m3.z, a.m3.w},
};
float det_4_2 = mons_mat3_determinant(minor_4_2);
mons_mat3 minor_4_3 = {
{a.m1.x, a.m1.y, a.m1.w},
{a.m2.x, a.m2.y, a.m2.w},
{a.m3.x, a.m3.y, a.m3.w},
};
float det_4_3 = mons_mat3_determinant(minor_4_3);
mons_mat3 minor_4_4 = {
{a.m1.x, a.m1.y, a.m1.z},
{a.m2.x, a.m2.y, a.m2.z},
{a.m3.x, a.m3.y, a.m3.z},
};
float det_4_4 = mons_mat3_determinant(minor_4_4);
mons_mat4 result = {
{det_1_1, det_1_2, det_1_3, det_1_4},
{det_2_1, det_2_2, det_2_3, det_2_4},
{det_3_1, det_3_2, det_3_3, det_3_4},
{det_4_1, det_4_2, det_4_3, det_4_4},
};
return result;
}
mons_mat4 mons_mat4_cofactor(mons_mat4 a) {
mons_mat4 result = mons_mat4_minor(a);
result.m1.y *= -1;
result.m1.w *= -1;
result.m2.x *= -1;
result.m2.z *= -1;
result.m3.y *= -1;
result.m3.w *= -1;
result.m4.x *= -1;
result.m4.z *= -1;
return result;
}
mons_mat4 mons_mat4_adjoint(mons_mat4 a) {
return mons_mat4_transpose(mons_mat4_cofactor(a));
}
mons_mat4 mons_mat4_inverse(mons_mat4 a) {
return mons_mat4_mul_f(mons_mat4_adjoint(a),
1.0 / mons_mat4_determinant(a));
}
int mons_mat4_equal(mons_mat4 a, mons_mat4 b) {
return mons_vec4_equal(a.m1, b.m1)
&& mons_vec4_equal(a.m2, b.m2)
&& mons_vec4_equal(a.m3, b.m3)
&& mons_vec4_equal(a.m4, b.m4);
}
void mons_mat4_mul_inplace(mons_mat4 *a, mons_mat4 b) {
*a = mons_mat4_mul(*a, b);
}
void mons_mat4_print(mons_mat4 mat) {
printf("[%.3f %.3f %.3f %.3f]\n", mat.m1.x, mat.m2.x, mat.m3.x, mat.m4.x);
printf("[%.3f %.3f %.3f %.3f]\n", mat.m1.y, mat.m2.y, mat.m3.y, mat.m4.y);
printf("[%.3f %.3f %.3f %.3f]\n", mat.m1.z, mat.m2.z, mat.m3.z, mat.m4.z);
printf("[%.3f %.3f %.3f %.3f]\n", mat.m1.w, mat.m2.w, mat.m3.w, mat.m4.w);
}
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