defines all the different opengl vector and matrix types in a page of code

gistfile1.c

#ifndef VEC_H_INCLUDED
#define VEC_H_INCLUDED

#include <stdbool.h>

#define VEC_H_DEF2(T) T x; T y;
#define VEC_H_DEF3(T) VEC_H_DEF2(T) T z;
#define VEC_H_DEF4(T) VEC_H_DEF3(T) T w;

#define VEC_H_DEF(P, NAME, T, N)    \
    typedef struct P##NAME##N {     \
        VEC_H_DEF##N(T)             \
    } P##NAME##N##_t;

#define VEC_H_DEFS3(P2, P3, P4, NAME, T)    \
    VEC_H_DEF(P2, NAME, T, 2)               \
    VEC_H_DEF(P3, NAME, T, 3)               \
    VEC_H_DEF(P4, NAME, T, 4)

#define VEC_H_DEFS(P, NAME, T) VEC_H_DEFS3(P, P, P, NAME, T)

VEC_H_DEFS(vec,  , float)
VEC_H_DEFS(vec, d, double)
VEC_H_DEFS(vec, i, int)
VEC_H_DEFS(vec, b, bool)

VEC_H_DEFS3(mat  , mat2x, mat2x, , vec2_t)
VEC_H_DEFS3(mat3x, mat  , mat3x, , vec3_t)
VEC_H_DEFS3(mat4x, mat4x, mat  , , vec4_t)

VEC_H_DEFS3(dmat  , dmat2x, dmat2x, , dvec2_t)
VEC_H_DEFS3(dmat3x, dmat  , dmat3x, , dvec3_t)
VEC_H_DEFS3(dmat4x, dmat4x, dmat  , , dvec4_t)

#endif /* VEC_H_INCLUDED */

gistfile2.c

#ifndef VEC_H_INCLUDED
#define VEC_H_INCLUDED

#include <stdbool.h>

#define VEC_H_DEF2(T) T x;          T y;
#define VEC_H_DEF3(T) VEC_H_DEF2(T) T z;
#define VEC_H_DEF4(T) VEC_H_DEF3(T) T w;

#define VEC_H_STRUCT(S, T, N)   \
    typedef struct S##N {       \
        VEC_H_DEF##N(T)         \
    } S##N##_t;

#define VEC_H_DEF(S2, S3, S4, T)    \
    VEC_H_STRUCT(S2, T, 2)          \
    VEC_H_STRUCT(S3, T, 3)          \
    VEC_H_STRUCT(S4, T, 4)

#define VEC_H_DEFVEC(S, T) VEC_H_DEF(S, S, S, T)

VEC_H_DEFVEC(vec , float)
VEC_H_DEFVEC(dvec, double)
VEC_H_DEFVEC(ivec, int)
VEC_H_DEFVEC(bvec, bool)

#define VEC_H_DEFMAT(P)                                 \
    VEC_H_DEF(P##mat  , P##mat2x, P##mat2x, P##vec2_t)  \
    VEC_H_DEF(P##mat3x, P##mat  , P##mat3x, P##vec3_t)  \
    VEC_H_DEF(P##mat4x, P##mat4x, P##mat  , P##vec4_t)

VEC_H_DEFMAT()
VEC_H_DEFMAT(d)

#endif /* VEC_H_INCLUDED */