Memory.cpp

/*
MIT License

Copyright (c) 2022 Tony D

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/


static
void Copy(void* source,uint32 size, void* destination)
{
	uint8 *start = (uint8*)source;
	uint8 *dest = (uint8*)destination;
    
	while (size--)
	{
		*start++ = *dest++;
	}
}

#define pushStruct(Arena, type) (type *)pushSize_(Arena,sizeof(type))
#define pushArray(Arena, Count, type) (type *)pushSize_(Arena,(Count) * sizeof(type))
void* pushSize_(memory_arena *Arena, m_index size)
{
	assert(Arena->Used + size < Arena->Size);
	void *Result = Arena->Base + Arena->Used;
	Arena->Used += size;
	return (Result);
}

static inline uint32 ToPageSize(uint32 input, uint32 pageSize)
{
    uint32 remainder = input % pageSize;
    return input - remainder;
}

static void arena_align(memory_arena *arena, m_index boundary)
{
	m_index p =(arena->Used + (boundary - 1));
	arena->Used = p - p % boundary;
}

static void ClearMemory(memory_arena *Arena, void *baseAddress, m_index size)
{
    assert(size < Arena->Used);
    ZeroMemory(baseAddress,size);
    Arena->Used -= size;
}

static void FreeBase(void* memoryBase)
{
    Win32VirtualFree(memoryBase);
}