dolphin/Source/Core/VideoCommon/DataReader.h

// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.

#pragma once

#include "Common/Common.h"
#include "VideoCommon/VertexManagerBase.h"

extern u8* g_video_buffer_read_ptr;

#if _M_SSE >= 0x301 && !(defined __GNUC__ && !defined __SSSE3__)
#include <tmmintrin.h>
#endif

__forceinline void DataSkip(u32 skip)
{
	g_video_buffer_read_ptr += skip;
}

// probably unnecessary
template <int count>
__forceinline void DataSkip()
{
	g_video_buffer_read_ptr += count;
}

template <typename T>
__forceinline T DataPeek(int _uOffset, u8** bufp = &g_video_buffer_read_ptr)
{
	auto const result = Common::FromBigEndian(*reinterpret_cast<T*>(*bufp + _uOffset));
	return result;
}

// TODO: kill these
__forceinline u8 DataPeek8(int _uOffset)
{
	return DataPeek<u8>(_uOffset);
}

__forceinline u16 DataPeek16(int _uOffset)
{
	return DataPeek<u16>(_uOffset);
}

__forceinline u32 DataPeek32(int _uOffset)
{
	return DataPeek<u32>(_uOffset);
}

template <typename T>
__forceinline T DataRead(u8** bufp = &g_video_buffer_read_ptr)
{
	auto const result = DataPeek<T>(0, bufp);
	*bufp += sizeof(T);
	return result;
}

class DataReader
{
public:
	inline DataReader() : buffer(g_video_buffer_read_ptr), offset(0) {}
	inline ~DataReader() { g_video_buffer_read_ptr += offset; }
	template <typename T> inline T Read()
	{
		const T result = Common::FromBigEndian(*(T*)(buffer + offset));
		offset += sizeof(T);
		return result;
	}
private:
	u8 *buffer;
	int offset;
};

// TODO: kill these
__forceinline u8 DataReadU8()
{
	return DataRead<u8>();
}

__forceinline s8 DataReadS8()
{
	return DataRead<s8>();
}

__forceinline u16 DataReadU16()
{
	return DataRead<u16>();
}

__forceinline u32 DataReadU32()
{
	return DataRead<u32>();
}

__forceinline u32 DataReadU32Unswapped()
{
	u32 tmp = *(u32*)g_video_buffer_read_ptr;
	g_video_buffer_read_ptr += 4;
	return tmp;
}

__forceinline u8* DataGetPosition()
{
	return g_video_buffer_read_ptr;
}

template <typename T>
__forceinline void DataWrite(T data)
{
	*(T*)VertexManager::s_pCurBufferPointer = data;
	VertexManager::s_pCurBufferPointer += sizeof(T);
}

class DataWriter
{
public:
	inline DataWriter() : buffer(VertexManager::s_pCurBufferPointer), offset(0) {}
	inline ~DataWriter() { VertexManager::s_pCurBufferPointer += offset; }
	template <typename T> inline void Write(T data)
	{
		*(T*)(buffer+offset) = data;
		offset += sizeof(T);
	}
private:
	u8 *buffer;
	int offset;
};