rawmath

Lightweight C math lib for 3D graphics, providing vec3 and mat4 with operations with column-major layout (OpenGL-compatible).

Features

• vec3 — add, sub, mul, dot, cross, normalize, lerp, reflect, magnitude...
• mat4 — identity, multiply, transpose, scale, add, sub...
• Column-major memory layout (compatible with glUniformMatrix4fv)
• No external dependencies except for <math.h>

Usage

#include <rawmath/mat4.h>
#include <rawmath/vec3.h>

mat4_t model;
mat4_identity(&model);
mat4_scale(&model, &model, 2.0f, 2.0f, 2.0f);

API

vec3

Function	Description
vec3_create(x, y, z)	Creates a new vec3
vec3_add(a, b)	Returns a + b
vec3_sub(a, b)	Returns a - b
vec3_dot_product(a, b)	Dot product
vec3_cross_product(a, b)	Cross product
vec3_normalize(v)	Normalizes in-place
vec3_magnitude(v)	Returns the length
vec3_lerp(a, b, t)	Linear interpolation
vec3_reflect(r, a, n)	Reflection (n must be normalized)

mat4

Function	Description
mat4_identity(dest)	Sets identity matrix
mat4_mul(dest, a, b)	Matrix multiplication
mat4_scale(dest, a, sx, sy, sz)	Scale transformation
mat4_transpose(dest, a)	Transpose
mat4_add(dest, a, b)	Element-wise addition
mat4_sub(dest, a, b)	Element-wise subtraction
mat4_translate(dest, a, tx, ty, tz)	Matrix translation
mat4_rotate(dest, a, axis, angle_rad)	Matrix rotation
mat4_perspective(dest, fov_y_rad, aspect, near, far)	Builds perspective projection
mat4_look_at(dest, eye, center, up)	Builds view matrix

Memory Layout

Matrices are stored in column-major order, matching OpenGL convention.

// MAT_IDX macro:
#define MAT_IDX(row, col) ((col) * 4 + (row))

Roadmap

• vec4 support

License

MIT