/*
 *   Sweet is a small library for basic math and small matrix operation.
 *   Copyright 2014 Luc Girod.
 *
 * This library is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */


#ifndef SWEET_MATRIX_H
#define SWEET_MATRIX_H

#include "sweet_types.h"

/* Matrix */

/** Null Matrix */
/** @return Null matrix */
mat2 sweet_matrix_null2 ();
mat3 sweet_matrix_null3 ();
mat4 sweet_matrix_null4 ();

/** Identity */
/** @return Indentity matrix */
mat2 sweet_matrix_identity2 ();
mat3 sweet_matrix_identity3 ();
mat4 sweet_matrix_identity4 ();

/** Frustum */
/** @param Right as flaot */
/** @param Left as float */
/** @param Top as float */
/** @param Bottom as float */
/** @param zNear as float */
/** @param zFar as float */
/** @return Perspective matrix 4x4 */
mat4 sweet_matrix_frustum (float left, float right,
                          float bottom, float top,
                          float zNear, float zFar);

/** Perspective */
/** @param fovy of the camera in degree as flaot */
/** @param aspect of the view as float */
/** @param zNear as float */
/** @param zFar as float */
/** @return Perspective matrix 4x4 */
mat4 sweet_matrix_perspective (double fovy, double aspect, double z_near, double z_far);

/** Ortho */
/** @param Right as flaot */
/** @param Left as float */
/** @param Top as float */
/** @param Bottom as float */
/** @param zNear as float */
/** @param zFar as float */
/** @return Orthogonal matrix 4x4 */
mat4 sweet_matrix_ortho (float left, float right,
                        float bottom, float top,
                        float zNear, float zFar);

/** @return camera matrix */
mat4 sweet_matrix_look_at (vec3 pos, vec3 dir, vec3 up);

/** Rotation from quaterion */
/** @param quaternion representing rotation */
/** @return 3d Rotation matrix */
mat3 sweet_matrix_quat_rotation3 (quaternion q);
mat4 sweet_matrix_quat_rotation3h (quaternion q);

/** Rotation */
/** @param Angle in radian as flaot */
/** @param X, Y, Z as rotation component */
/** @return 3d Rotation matrix */
mat2 sweet_matrix_rotation2 (float angle);
mat3 sweet_matrix_rotation2h (float angle);
mat3 sweet_matrix_rotation3 (float angle, float x, float y, float z);
mat4 sweet_matrix_rotation3h (float angle, float x, float y, float z);

/** Translation */
/** @param X,Y,Z or vector */
/** @return Translation matrix */
mat4 sweet_matrix_translation3h (vec3 v);
mat3 sweet_matrix_translation2h (vec2 v);

/** Scale */
/** @param X,Y,Z scale component */
/** @return Scale matrix */
mat4 sweet_matrix_scale4 (float x, float y, float z, float w);
mat3 sweet_matrix_scale3 (float x, float y, float z);
mat2 sweet_matrix_scale2 (float x, float y);

/** Texture bias */
/** @return texture bias matrix */
mat4 sweet_matrix_texture_bias ();

/** Transpose */
/** @param Matrix to transpose as mat2 *, mat3 * or mat4 * */
void sweet_matrix_transpose2 (mat2 * transpose, mat2 * matrix);
void sweet_matrix_transpose3 (mat3 * transpose, mat3 * matrix);
void sweet_matrix_transpose4 (mat4 * transpose, mat4 * matrix);

/** Det */
/** @param Matrix as mat2, mat3 or mat4 */
/** @return Determinant as float */
float sweet_matrix_det2 (mat2 * matrix);
float sweet_matrix_det3 (mat3 * matrix);
float sweet_matrix_det4 (mat4 * matrix);

/** Inverse */
/** @param matrix as mat2 *, mat3 * or mat4 * */
/** @param matrix to inverse as mat2 *, mat3 * or mat4 * */
void sweet_matrix_inverse2 (mat2 * inverse, mat2 * matrix);
void sweet_matrix_inverse3 (mat3 * inverse, mat3 * matrix);
void sweet_matrix_inverse4 (mat4 * inverse, mat4 * matrix);

/** Product */
/** @param Product of the Matrix1 times Matrix2 as mat2 *, mat3 * or mat4 * */
/** @param Matrix1, Matrix2 as mat2 *, mat3 * or mat4 * */
void sweet_matrix_product2 (mat2 * product, mat2 * matrix1, mat2 * matrix2);
void sweet_matrix_product3 (mat3 * product, mat3 * matrix1, mat3 * matrix2);
void sweet_matrix_product4 (mat4 * product, mat4 * matrix1, mat4 * matrix2);

/** Matrix Cast */
/** Extract upper left sub matrix */
/** @param sub as mat2 * or mat3 * */
/** @param Matrix */
void sweet_matrix_sub3 (mat2 * sub, mat3 * matrix);
void sweet_matrix_sub4 (mat3 * sub, mat4 * matrix);

/** Column*/
/** @param Matrix */
/** @param Column id as column number : begin at 0 */
/** @return matrix column as vec2, vec3 or vec4 */
vec2 sweet_matrix_column2 (mat2 * matrix, int column_id);
vec3 sweet_matrix_column3 (mat3 * matrix, int column_id);
vec4 sweet_matrix_column4 (mat4 * matrix, int column_id);

/** Mult*/
/** @param Matrix */
/** @param Vector */
/** @return Matrix * Vector */
vec2 sweet_matrix_mult2 (mat2 * matrix, vec2 vector);
vec3 sweet_matrix_mult3 (mat3 * matrix, vec3 vector);
vec4 sweet_matrix_mult4 (mat4 * matrix, vec4 vector);

/** Eigen Value */
int sweet_matrix_eigen_value3 (float * a, float * b, float * c, mat3 * m);

/** Gaussian elimination */
int sweet_matrix_gaussian_elimination3 (mat3 * m, vec3 * v);

/** Solve linear system */
int sweet_matrix_solve3 (mat3 * a, vec3 * v);

/** Eigen Vector */
int sweet_matrix_eigen_vector3 (vec3 * vectors, mat3 * m);

#endif