base.h

// SPDX-FileCopyrightText: 2023 Erin Catto
// SPDX-License-Identifier: MIT
 
#pragma once
 
#include <stdint.h>
 
// clang-format off
// 
// Shared library macros
#if defined( _MSC_VER ) && defined( box2d_EXPORTS )
    // build the Windows DLL
    #define BOX2D_EXPORT __declspec( dllexport )
#elif defined( _MSC_VER ) && defined( BOX2D_DLL )
    // using the Windows DLL
    #define BOX2D_EXPORT __declspec( dllimport )
#elif defined( box2d_EXPORTS )
    // building or using the shared library
    #define BOX2D_EXPORT __attribute__( ( visibility( "default" ) ) )
#else
    // static library
    #define BOX2D_EXPORT
#endif
 
// C++ macros
#ifdef __cplusplus
    #define B2_API extern "C" BOX2D_EXPORT
    #define B2_INLINE inline
    #define B2_LITERAL(T) T
    #define B2_ZERO_INIT {}
#else
    #define B2_API BOX2D_EXPORT
    #define B2_INLINE static inline
    #define B2_LITERAL(T) (T)
    #define B2_ZERO_INIT {0}
#endif
// clang-format on


typedef void* b2AllocFcn( unsigned int size, int alignment );

typedef void b2FreeFcn( void* mem );

typedef int b2AssertFcn( const char* condition, const char* fileName, int lineNumber );

B2_API void b2SetAllocator( b2AllocFcn* allocFcn, b2FreeFcn* freeFcn );

B2_API int b2GetByteCount( void );

B2_API void b2SetAssertFcn( b2AssertFcn* assertFcn );

typedef struct b2Version
{
    int major;

    int minor;

    int revision;
} b2Version;

B2_API b2Version b2GetVersion( void );


 
// see https://github.com/scottt/debugbreak
#if defined( _MSC_VER )
#define B2_BREAKPOINT __debugbreak()
#elif defined( __GNUC__ ) || defined( __clang__ )
#define B2_BREAKPOINT __builtin_trap()
#else
// Unknown compiler
#include <assert.h>
#define B2_BREAKPOINT assert( 0 )
#endif
 
#if !defined( NDEBUG ) || defined( B2_ENABLE_ASSERT )
B2_API int b2InternalAssertFcn( const char* condition, const char* fileName, int lineNumber );
#define B2_ASSERT( condition )                                                                                                   \
    do                                                                                                                           \
    {                                                                                                                            \
        if ( !( condition ) && b2InternalAssertFcn( #condition, __FILE__, (int)__LINE__ ) )                                          \
            B2_BREAKPOINT;                                                                                                       \
    }                                                                                                                            \
    while ( 0 )
#else
#define B2_ASSERT( ... ) ( (void)0 )
#endif

B2_API uint64_t b2GetTicks( void );

B2_API float b2GetMilliseconds( uint64_t ticks );

B2_API float b2GetMillisecondsAndReset( uint64_t* ticks );

B2_API void b2Yield( void );

#define B2_HASH_INIT 5381
B2_API uint32_t b2Hash( uint32_t hash, const uint8_t* data, int count );