matrix4.c File Reference

4x4 Matrices More...

#include "matrix4.h"
#include <math.h>

Functions
void	matrix4_perspective (matrix4 mtx, float fov, float aspect, float near, float far)
	Generate a perspective projection matrix.
void	matrix4_orthographic (matrix4 mtx, float left, float right, float bottom, float top, float near, float far)
	Generate a orthographic projection matrix.

Detailed Description

4x4 Matrices

Your standard column major 4x4 matrix you all know and love.

Author

Samuel Fitzsimons (rainbain)

Date

2025 @license MIT (see LICENSE file)

Function Documentation

matrix4_orthographic()

void matrix4_orthographic	(	matrix4	mtx,
		float	left,
		float	right,
		float	bottom,
		float	top,
		float	near,
		float	far )

Generate a orthographic projection matrix.

Transforms points to screen space with no perspective adjustment. So objects remain the same size no matter the Z. Z is treated like 2D layers.

Each feild shows the corners of the 2D space that the points take place in, and will then be projected to the screen.

Points outside are clipped.

Parameters

mtx	Matrix to save output into
left	Left most boundary.
right	Right most boundary.
bottom	Bottom most boundary.
top	top most boundary.
near	Near Z of the view area. Things outside of it will be clipped.
far	Far Z of the view area. Things outside of it will be clipped.

matrix4_perspective()

void matrix4_perspective	(	matrix4	mtx,
		float	fov,
		float	aspect,
		float	near,
		float	far )

Generate a perspective projection matrix.

Used to setup a perspective projection matrix to transform points into screen space such that they appear farther as they go into (-Z) of the screen.

Parameters

mtx	Matrix to save output into
fov	Feild of view in radians.
aspect	Aspect ration of the screen. Width / Height
near	Near Z of the view area. Things outside of it will be clipped.
far	Far Z of the view area. Things outside of it will be clipped.