#ifndef MATRIX_MATH_H
#define MATRIX_MATH_H

#include <GL/gl.h>

/**
 * !!! ALL matrices are in column major
 */

typedef GLfloat vec4[4];
typedef GLfloat vec3[3];

typedef GLfloat mat4[16];

extern void mat4Identity(mat4 mat);
extern void mat4Copy(mat4 src, mat4 dst);
extern void mat4Empty(mat4 mat);
extern void mat4Multiply(mat4 result, mat4 A, mat4 B);
extern void mat4Print(mat4 m);
extern void mat4Translate(mat4 out, mat4 in, vec3 v);
extern void mat4Scale(mat4 out, mat4 in, vec3 v);
extern void mat4RotateX(mat4 out, mat4 in, GLfloat a);
extern void mat4RotateY(mat4 out, mat4 in, GLfloat a);
extern void mat4RotateZ(mat4 out, mat4 in, GLfloat a);
extern void mat4BuildLookAt(mat4 out, vec3 eye, vec3 center, vec3 up);
extern void mat4BuildProjection(mat4 out, GLfloat r, GLfloat l, GLfloat t, GLfloat b, GLfloat f, GLfloat n);

extern void vec3Subtract(vec3 out, vec3 a, vec3 b);
extern void vec3CrossProduct(vec3 out, vec3 a, vec3 b);
extern void vec3Normalise(vec3 out, vec3 in);
extern GLfloat vec3Length(vec3 in);
extern GLfloat vec3DotProduct(vec3 a, vec3 b);

#endif