matrix3_ptr.c File Reference

#include <vecmat.h>

Go to the source code of this file.

Functions
void	mat3_identity_ptr (matrix3 *res)
	Initializes the 3x3 matrix to identity (diagonal 1.0, others 0.0).
void	mat3_mul_ptr (matrix3 *res, const matrix3 *a, const matrix3 *b)
	Multiplies two 3x3 matrices (a * b) in column-major / column-vector convention.
void	mat3_transpose_ptr (matrix3 *res, const matrix3 *m)
	Computes the transpose of the input 3x3 matrix and stores in res.
void	mat3_inverse_ptr (matrix3 *res, const matrix3 *m)
	Computes the inverse of the input 3x3 matrix using the adjugate method and stores in res.
void	mat3_rotation_z_ptr (matrix3 *res, const vm_float_t degrees)
	Sets the 3x3 matrix to a rotation around the Z-axis by the given angle in degrees.
void	mat3_rotation_x_ptr (matrix3 *res, const vm_float_t degrees)
	Builds a 3x3 rotation matrix around the X axis (degrees).
void	mat3_rotation_y_ptr (matrix3 *res, const vm_float_t degrees)
	Builds a 3x3 rotation matrix around the Y axis (degrees).
void	mat3_translate_ptr (matrix3 *res, const vector2 *t)
	Builds a 3x3 2D translation matrix.
void	mat3_scale_ptr (matrix3 *res, const vector2 *s)
	Builds a 3x3 2D scaling matrix.
void	mat3_from_mat4_ptr (matrix3 *res, const matrix4 *m)
	Copies the upper-left 3x3 of a matrix4.
void	mat3_mul_vec3_ptr (vector3 *res, const matrix3 *m, const vector3 *v)
	Multiplies a 3x3 matrix by a vector3.
void	mat3_mul_vec2_ptr (vector2 *res, const matrix3 *m, const vector2 *v)
	Applies a 3x3 affine transform to a vector2.

Function Documentation

mat3_from_mat4_ptr()

void mat3_from_mat4_ptr	(	matrix3 *	res,
		const matrix4 *	m )

Copies the upper-left 3x3 of a matrix4.

Parameters

res	Output value.
m	Input matrix.

Definition at line 199 of file matrix3_ptr.c.

References matrix3::m11, matrix4::m11, matrix3::m12, matrix4::m12, matrix3::m13, matrix4::m13, matrix3::m21, matrix4::m21, matrix3::m22, matrix4::m22, matrix3::m23, matrix4::m23, matrix3::m31, matrix4::m31, matrix3::m32, matrix4::m32, matrix3::m33, and matrix4::m33.

Referenced by mat3_from_mat4().

mat3_identity_ptr()

void mat3_identity_ptr

(

matrix3 *

res

)

Initializes the 3x3 matrix to identity (diagonal 1.0, others 0.0).

Parameters

res	Pointer to the output matrix3.

Definition at line 12 of file matrix3_ptr.c.

References matrix3::v.

Referenced by mat3_identity(), mat3_inverse_ptr(), mat3_scale_ptr(), and mat3_translate_ptr().

mat3_inverse_ptr()

void mat3_inverse_ptr	(	matrix3 *	res,
		const matrix3 *	m )

Computes the inverse of the input 3x3 matrix using the adjugate method and stores in res.

If the determinant is zero, sets res to identity.

Parameters

res	Pointer to the output matrix3.
m	Pointer to the input matrix.

Definition at line 78 of file matrix3_ptr.c.

References mat3_identity_ptr(), and matrix3::v.

Referenced by mat3_inverse().

mat3_mul_ptr()

void mat3_mul_ptr	(	matrix3 *	res,
		const matrix3 *	a,
		const matrix3 *	b )

Multiplies two 3x3 matrices (a * b) in column-major / column-vector convention.

Accumulates into a temporary matrix.

Parameters

res	Pointer to the output matrix3.
a	Pointer to the first matrix.
b	Pointer to the second matrix.

Definition at line 34 of file matrix3_ptr.c.

References matrix3::m11, matrix3::m12, matrix3::m13, matrix3::m21, matrix3::m22, matrix3::m23, matrix3::m31, matrix3::m32, and matrix3::m33.

Referenced by mat3_mul().

mat3_mul_vec2_ptr()

void mat3_mul_vec2_ptr	(	vector2 *	res,
		const matrix3 *	m,
		const vector2 *	v )

Applies a 3x3 affine transform to a vector2.

Parameters

res	Output value.
m	Input matrix.
v	Input vector.

Definition at line 230 of file matrix3_ptr.c.

References matrix3::m11, matrix3::m12, matrix3::m13, matrix3::m21, matrix3::m22, matrix3::m23, vector2::x, and vector2::y.

Referenced by mat3_mul_vec2().

mat3_mul_vec3_ptr()

void mat3_mul_vec3_ptr	(	vector3 *	res,
		const matrix3 *	m,
		const vector3 *	v )

Multiplies a 3x3 matrix by a vector3.

Parameters

res	Output value.
m	Input matrix.
v	Input vector.

Definition at line 213 of file matrix3_ptr.c.

References matrix3::m11, matrix3::m12, matrix3::m13, matrix3::m21, matrix3::m22, matrix3::m23, matrix3::m31, matrix3::m32, matrix3::m33, vector3::x, vector3::y, and vector3::z.

Referenced by mat3_mul_vec3().

mat3_rotation_x_ptr()

void mat3_rotation_x_ptr	(	matrix3 *	res,
		const vm_float_t	degrees )

Builds a 3x3 rotation matrix around the X axis (degrees).

Parameters

res	Output value.
degrees	Rotation angle in degrees.

Definition at line 137 of file matrix3_ptr.c.

References deg_to_rad(), VECMAT_COS, and VECMAT_SIN.

Referenced by mat3_rotation_x().

mat3_rotation_y_ptr()

void mat3_rotation_y_ptr	(	matrix3 *	res,
		const vm_float_t	degrees )

Builds a 3x3 rotation matrix around the Y axis (degrees).

Parameters

res	Output value.
degrees	Rotation angle in degrees.

Definition at line 155 of file matrix3_ptr.c.

References deg_to_rad(), VECMAT_COS, and VECMAT_SIN.

Referenced by mat3_rotation_y().

mat3_rotation_z_ptr()

void mat3_rotation_z_ptr	(	matrix3 *	res,
		const vm_float_t	degrees )

Sets the 3x3 matrix to a rotation around the Z-axis by the given angle in degrees.

Parameters

res	Pointer to the output matrix3.
degrees	Rotation angle in degrees.

Definition at line 112 of file matrix3_ptr.c.

References matrix3::m11, matrix3::m12, matrix3::m13, matrix3::m21, matrix3::m22, matrix3::m23, matrix3::m31, matrix3::m32, matrix3::m33, M_PI, VECMAT_COS, and VECMAT_SIN.

Referenced by mat3_rotation_z().

mat3_scale_ptr()

void mat3_scale_ptr	(	matrix3 *	res,
		const vector2 *	s )

Builds a 3x3 2D scaling matrix.

Parameters

res	Output value.
s	Scale vector.

Definition at line 186 of file matrix3_ptr.c.

References matrix3::m11, matrix3::m22, mat3_identity_ptr(), vector2::x, and vector2::y.

Referenced by mat3_scale().

mat3_translate_ptr()

void mat3_translate_ptr	(	matrix3 *	res,
		const vector2 *	t )

Builds a 3x3 2D translation matrix.

Parameters

res	Output value.
t	Translation vector.

Definition at line 173 of file matrix3_ptr.c.

References matrix3::m13, matrix3::m23, mat3_identity_ptr(), vector2::x, and vector2::y.

Referenced by mat3_translate().

mat3_transpose_ptr()

void mat3_transpose_ptr	(	matrix3 *	res,
		const matrix3 *	m )

Computes the transpose of the input 3x3 matrix and stores in res.

Parameters

res	Pointer to the output matrix3.
m	Pointer to the input matrix.

Definition at line 58 of file matrix3_ptr.c.

References matrix3::v.

Referenced by mat3_transpose().