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#pragma once
#include "typedef.h"
#include "vector.h"
typedef struct {
F32 m[4][4];
} MAT4;
inline void mat4_identity( MAT4* out ) {
for( I32 i = 0; i < 16; i++ ) {
out->m[0][i] = (i % 5 == 0) ? 1.0f : 0.0f;
}
}
inline void mat4_mul( MAT4* a, MAT4* b, MAT4* out ) {
for( I32 row = 0; row < 4; row++ ) {
for( I32 col = 0; col < 4; col++ ) {
out->m[row][col] = 0.0f;
for( I32 k = 0; k < 4; k++ ) {
out->m[row][col] += a->m[row][k] * b->m[k][col];
}
}
}
}
inline void mat4_mul_vec4( MAT4 *m, VEC4 *in, VEC4 *out ) {
out->x = m->m[0][0] * in->x + m->m[0][1] * in->y + m->m[0][2] * in->z + m->m[0][3] * in->w;
out->y = m->m[1][0] * in->x + m->m[1][1] * in->y + m->m[1][2] * in->z + m->m[1][3] * in->w;
out->z = m->m[2][0] * in->x + m->m[2][1] * in->y + m->m[2][2] * in->z + m->m[2][3] * in->w;
out->w = m->m[3][0] * in->x + m->m[3][1] * in->y + m->m[3][2] * in->z + m->m[3][3] * in->w;
}
inline void mat4_perspective( MAT4* out, F32 fovy_radians, F32 aspect, F32 znear, F32 zfar ) {
mat4_identity( out );
F32 f = 1.f / tanf( fovy_radians * .5f );
out->m[0][0] = f / aspect;
out->m[1][1] = f;
out->m[2][2] = (zfar + znear) / (znear - zfar);
out->m[2][3] = (2.f * zfar * znear) / (znear - zfar);
out->m[3][2] = -1.f;
out->m[3][3] = 0.f;
}
inline void mat4_translation( MAT4* out, F32 tx, F32 ty, F32 tz ) {
mat4_identity( out );
out->m[0][3] = tx;
out->m[1][3] = ty;
out->m[2][3] = tz;
}
inline void mat4_rotation_x( MAT4* out, F32 angle ) {
mat4_identity( out );
F32 c = cosf( angle );
F32 s = sinf( angle );
out->m[1][1] = c;
out->m[1][2] = -s;
out->m[2][1] = s;
out->m[2][2] = c;
}
inline void mat4_rotation_y( MAT4* out, F32 angle ) {
mat4_identity( out );
F32 c = cosf( angle );
F32 s = sinf( angle );
out->m[0][0] = c;
out->m[0][2] = -s;
out->m[2][0] = s;
out->m[2][2] = c;
}
inline void mat4_rotation_z( MAT4* out, F32 angle ) {
mat4_identity( out );
F32 c = cosf( angle );
F32 s = sinf( angle );
out->m[0][0] = c;
out->m[0][1] = -s;
out->m[1][0] = s;
out->m[1][1] = c;
}
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