/* date = June 19th 2023 10:07 pm */

#ifndef CORE_MEMORY_H
#define CORE_MEMORY_H

//- sixten: Common memory functions

static void Copy(void *Dest, void *Source, umm Count);
static void Fill(void *Dest, u8 Value, umm Count);

//- sixten: Memory arena types

struct platform_memory_block;

struct memory_arena
{
    platform_memory_block *CurrentBlock;
    umm MinimumBlockSize;
    s32 TemporaryMemoryCount;
};

struct temporary_memory
{
    memory_arena *Arena;
    platform_memory_block *Block;
    umm Used;
};

//- sixten: Arena push flags

enum arena_push_flag
{
    ArenaFlag_ClearToZero = 0x1,
};

struct arena_push_params
{
    u32 Flags;
    u32 Alignment;
};

inline arena_push_params DefaultArenaParams(void)
{
    arena_push_params Params = {};
    Params.Flags = ArenaFlag_ClearToZero;
    Params.Alignment = 4;
    return(Params);
}

inline arena_push_params NoClear(void)
{
    arena_push_params Params = DefaultArenaParams();
    Params.Flags &= ~ArenaFlag_ClearToZero;
    return(Params);
}

//- sixten: Memory arena functions

static void Release(memory_arena *Arena);

#define PushSize(Arena, InitialSize, ...) PushSize_(Arena, InitialSize, __VA_ARGS__)
#define PushStruct(Arena, type, ...) (type *)PushSize_(Arena, sizeof(type), __VA_ARGS__)
#define PushArray(Arena, type, Count, ...) (type *)PushSize_(Arena, sizeof(type)*Count, __VA_ARGS__)
static void *PushSize_(memory_arena *Arena, umm InitialSize, arena_push_params Params = DefaultArenaParams());

//- sixten: Bootstrapping helpers

#define BootstrapPushStruct(type, Member) (type *)BootstrapPushSize(sizeof(type), OffsetOf(type, Member))
static void *BootstrapPushSize(umm Size, umm OffsetToArena);

//- sixten: Temporary memory functions

static temporary_memory BeginTemporaryMemory(memory_arena *Arena);
static void EndTemporaryMemory(temporary_memory Temp);

#endif //CORE_MEMORY_H