// -----------------------------------------------------------------------------
// semantic versioning in a single byte (octal)
// - rlyeh, public domain.
//
// - single octal byte that represents semantic versioning (major.minor.patch).
// - allowed range [0000..0377] ( <-> [0..255] decimal )
// - comparison checks only major.minor tuple as per convention.

API int semver( int major, int minor, int patch );
API int semvercmp( int v1, int v2 );

#define SEMVER(major,minor,patch) (0100 * (major) + 010 * (minor) + (patch))
#define SEMVERCMP(v1,v2) (((v1) & 0110) - ((v2) & 0110))
#define SEMVERFMT "%03o"

// -----------------------------------------------------------------------------
// autorun initializers for C
// - rlyeh, public domain
//
// note: based on code by Joe Lowe (public domain).
// note: XIU for C initializers, XCU for C++ initializers, XTU for C deinitializers

#ifdef __cplusplus
#define AUTORUN \
    static void AUTORUN_U(f)(void); \
    static const int AUTORUN_J(AUTORUN_U(f),__1) = (AUTORUN_U(f)(), 1); \
    static void AUTORUN_U(f)(void)
#elif _MSC_VER
#define AUTORUN \
    static void AUTORUN_U(f)(void); \
    static int AUTORUN_J(AUTORUN_U(f),__1) (){ AUTORUN_U(f)(); return 0; } \
    __pragma(section(".CRT$XIU", long, read)) \
    __declspec(allocate(".CRT$XIU")) \
    static int(* AUTORUN_J(AUTORUN_U(f),__2) )() = AUTORUN_J(AUTORUN_U(f),__1); \
    static void AUTORUN_U(f)(void)
#else
#define AUTORUN \
    __attribute__((constructor)) \
    static void AUTORUN_U(f)(void)
#endif

// join + unique macro utils

#define AUTORUN_j(a, b) a##b
#define AUTORUN_J(a, b) AUTORUN_j(a, b)
#define AUTORUN_U(x)    AUTORUN_J(x, __LINE__)

#if 0 // autorun demo
void byebye(void) { puts("seen after main()"); }
AUTORUN { puts("seen before main()"); }
AUTORUN { puts("seen before main() too"); atexit( byebye ); }
#endif

// -----------------------------------------------------------------------------
// storage types. refer to vec2i/3i, vec2/3/4 if you plan to do math operations

typedef struct byte2 { uint8_t x,y; } byte2;
typedef struct byte3 { uint8_t x,y,z; } byte3;
typedef struct byte4 { uint8_t x,y,z,w; } byte4;

typedef struct int2 { int x,y; } int2;
typedef struct int3 { int x,y,z; } int3;
typedef struct int4 { int x,y,z,w; } int4;

typedef struct uint2 { unsigned int x,y; } uint2;
typedef struct uint3 { unsigned int x,y,z; } uint3;
typedef struct uint4 { unsigned int x,y,z,w; } uint4;

typedef struct float2 { float x,y; } float2;
typedef struct float3 { float x,y,z; } float3;
typedef struct float4 { float x,y,z,w; } float4;

typedef struct double2 { double x,y; } double2;
typedef struct double3 { double x,y,z; } double3;
typedef struct double4 { double x,y,z,w; } double4;

#define byte2(x,y)       M_CAST(byte2, (uint8_t)(x), (uint8_t)(y) )
#define byte3(x,y,z)     M_CAST(byte3, (uint8_t)(x), (uint8_t)(y), (uint8_t)(z) )
#define byte4(x,y,z,w)   M_CAST(byte4, (uint8_t)(x), (uint8_t)(y), (uint8_t)(z), (uint8_t)(w) )

#define int2(x,y)        M_CAST(int2, (int)(x), (int)(y) )
#define int3(x,y,z)      M_CAST(int3, (int)(x), (int)(y), (int)(z) )
#define int4(x,y,z,w)    M_CAST(int4, (int)(x), (int)(y), (int)(z), (int)(w) )

#define uint2(x,y)       M_CAST(uint2, (unsigned)(x), (unsigned)(y) )
#define uint3(x,y,z)     M_CAST(uint3, (unsigned)(x), (unsigned)(y), (unsigned)(z) )
#define uint4(x,y,z,w)   M_CAST(uint4, (unsigned)(x), (unsigned)(y), (unsigned)(z), (unsigned)(w) )

#define float2(x,y)      M_CAST(float2, (float)(x), (float)(y) )
#define float3(x,y,z)    M_CAST(float3, (float)(x), (float)(y), (float)(z) )
#define float4(x,y,z,w)  M_CAST(float4, (float)(x), (float)(y), (float)(z), (float)(w) )

#define double2(x,y)     M_CAST(double2, (double)(x), (double)(y) )
#define double3(x,y,z)   M_CAST(double3, (double)(x), (double)(y), (double)(z) )
#define double4(x,y,z,w) M_CAST(double4, (double)(x), (double)(y), (double)(z), (double)(w) )