matrix2.c File Reference

#include <vecmat.h>

Go to the source code of this file.

Functions
matrix2	mat2_identity (void)
	Constructs the 2x2 identity matrix.
matrix2	mat2_mul (const matrix2 a, const matrix2 b)
	Multiplies two 2x2 matrices (a * b).
matrix2	mat2_transpose (const matrix2 m)
	Computes the transpose of a 2x2 matrix.
matrix2	mat2_inverse (const matrix2 m)
	Computes the inverse of a 2x2 matrix.
matrix2	mat2_rotation_z (const vm_float_t degrees)
	Constructs a 2x2 Z-axis rotation matrix.
vm_float_t	mat2_determinant (const matrix2 m)
	Calculates the determinant of the given 2x2 matrix.
vector2	mat2_mul_vec2 (const matrix2 m, const vector2 v)
	Multiplies a 2x2 matrix by a vector2.
matrix2	mat2_scale (const vector2 s)
	Builds a 2x2 scaling matrix from a vector2.
matrix2	mat2_from_mat3 (const matrix3 m)
	Copies the upper-left 2x2 of a matrix3.

Function Documentation

mat2_determinant()

vm_float_t mat2_determinant

(

const matrix2

m

)

Calculates the determinant of the given 2x2 matrix.

Parameters

m	The matrix.

Returns

The determinant value (m.v[0]*m.v[3] - m.v[1]*m.v[2]).

Definition at line 88 of file matrix2.c.

References matrix2::v.

Referenced by mat2_inverse_ptr().

mat2_from_mat3()

matrix2 mat2_from_mat3

(

const matrix3

m

)

Copies the upper-left 2x2 of a matrix3.

See mat2_from_mat3_ptr instead.

Parameters

m	Input matrix.

Returns

The resulting matrix2.

Definition at line 132 of file matrix2.c.

References mat2_from_mat3_ptr().

mat2_identity()

matrix2 mat2_identity

(

void

)

Constructs the 2x2 identity matrix.

See mat2_identity_ptr instead.

Returns

The identity matrix2.

Definition at line 14 of file matrix2.c.

References mat2_identity_ptr().

mat2_inverse()

matrix2 mat2_inverse

(

const matrix2

m

)

Computes the inverse of a 2x2 matrix.

See mat2_inverse_ptr instead.

Parameters

m	The input matrix.

Returns

The inverse matrix2.

Definition at line 60 of file matrix2.c.

References mat2_inverse_ptr().

mat2_mul()

matrix2 mat2_mul	(	const matrix2	a,
		const matrix2	b )

Multiplies two 2x2 matrices (a * b).

See mat2_mul_ptr instead.

Parameters

a	The first matrix.
b	The second matrix.

Returns

The resulting product matrix2.

Definition at line 30 of file matrix2.c.

References mat2_mul_ptr().

mat2_mul_vec2()

vector2 mat2_mul_vec2	(	const matrix2	m,
		const vector2	v )

Multiplies a 2x2 matrix by a vector2.

See mat2_mul_vec2_ptr instead.

Parameters

m	Input matrix.
v	Input vector.

Returns

The resulting vector2.

Definition at line 102 of file matrix2.c.

References mat2_mul_vec2_ptr().

mat2_rotation_z()

matrix2 mat2_rotation_z

(

const vm_float_t

degrees

)

Constructs a 2x2 Z-axis rotation matrix.

See mat2_rotation_z_ptr instead.

Parameters

degrees

Rotation angle in degrees.

Returns

The rotation matrix2.

Definition at line 75 of file matrix2.c.

References mat2_rotation_z_ptr().

mat2_scale()

matrix2 mat2_scale

(

const vector2

s

)

Builds a 2x2 scaling matrix from a vector2.

See mat2_scale_ptr instead.

Parameters

s	Scale vector.

Returns

The resulting matrix2.

Definition at line 117 of file matrix2.c.

References mat2_scale_ptr().

mat2_transpose()

matrix2 mat2_transpose

(

const matrix2

m

)

Computes the transpose of a 2x2 matrix.

See mat2_transpose_ptr instead.

Parameters

m	The input matrix.

Returns

The transposed matrix2.

Definition at line 45 of file matrix2.c.

References mat2_transpose_ptr().