// Copyright 2011 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include <algorithm>

#include "Common/Assert.h"
#include "Core/ConfigManager.h"
#include "Core/Core.h"
#include "Core/FifoPlayer/FifoAnalyzer.h"
#include "VideoCommon/VertexLoader.h"
#include "VideoCommon/VertexLoader_Normal.h"
#include "VideoCommon/VertexLoader_Position.h"
#include "VideoCommon/VertexLoader_TextCoord.h"

namespace FifoAnalyzer
{

void Init()
{
	VertexLoader_Normal::Init();
}

u8 ReadFifo8(u8*& data)
{
	u8 value = data[0];
	data += 1;
	return value;
}

u16 ReadFifo16(u8*& data)
{
	u16 value = Common::swap16(data);
	data += 2;
	return value;
}

u32 ReadFifo32(u8*& data)
{
	u32 value = Common::swap32(data);
	data += 4;
	return value;
}

void InitBPMemory(BPMemory* bpMem)
{
	memset(bpMem, 0, sizeof(BPMemory));
	bpMem->bpMask = 0x00FFFFFF;
}

BPCmd DecodeBPCmd(u32 value, const BPMemory& bpMem)
{
	//handle the mask register
	int opcode = value >> 24;
	int oldval = ((u32*)&bpMem)[opcode];
	int newval = (oldval & ~bpMem.bpMask) | (value & bpMem.bpMask);
	int changes = (oldval ^ newval) & 0xFFFFFF;

	BPCmd bp = {opcode, changes, newval};

	return bp;
}

void LoadBPReg(const BPCmd& bp, BPMemory& bpMem)
{
	((u32*)&bpMem)[bp.address] = bp.newvalue;

	//reset the mask register
	if (bp.address != 0xFE)
		bpMem.bpMask = 0xFFFFFF;
}

void LoadCPReg(u32 subCmd, u32 value, CPMemory& cpMem)
{
	switch (subCmd & 0xF0)
	{
	case 0x50:
		cpMem.vtxDesc.Hex &= ~0x1FFFF;  // keep the Upper bits
		cpMem.vtxDesc.Hex |= value;
		break;

	case 0x60:
		cpMem.vtxDesc.Hex &= 0x1FFFF;  // keep the lower 17Bits
		cpMem.vtxDesc.Hex |= (u64)value << 17;
		break;

	case 0x70:
		_assert_((subCmd & 0x0F) < 8);
		cpMem.vtxAttr[subCmd & 7].g0.Hex = value;
		break;

	case 0x80:
		_assert_((subCmd & 0x0F) < 8);
		cpMem.vtxAttr[subCmd & 7].g1.Hex = value;
		break;

	case 0x90:
		_assert_((subCmd & 0x0F) < 8);
		cpMem.vtxAttr[subCmd & 7].g2.Hex = value;
		break;

	case 0xA0:
		cpMem.arrayBases[subCmd & 0xF] = value;
		break;

	case 0xB0:
		cpMem.arrayStrides[subCmd & 0xF] = value & 0xFF;
		break;
	}
}

u32 CalculateVertexSize(int vatIndex, const CPMemory& cpMem)
{
	int sizes[21];
	CalculateVertexElementSizes(sizes, vatIndex, cpMem);

	return std::accumulate(std::begin(sizes), std::end(sizes), 0U);
}

void CalculateVertexElementSizes(int sizes[], int vatIndex, const CPMemory& cpMem)
{
	const TVtxDesc &vtxDesc = cpMem.vtxDesc;
	const VAT &vtxAttr = cpMem.vtxAttr[vatIndex];

	// Colors
	const u64 colDesc[2] = {vtxDesc.Color0, vtxDesc.Color1};
	const u32 colComp[2] = {vtxAttr.g0.Color0Comp, vtxAttr.g0.Color1Comp};

	const u32 tcElements[8] =
	{
		vtxAttr.g0.Tex0CoordElements, vtxAttr.g1.Tex1CoordElements, vtxAttr.g1.Tex2CoordElements,
		vtxAttr.g1.Tex3CoordElements, vtxAttr.g1.Tex4CoordElements, vtxAttr.g2.Tex5CoordElements,
		vtxAttr.g2.Tex6CoordElements, vtxAttr.g2.Tex7CoordElements
	};

	const u32 tcFormat[8] =
	{
		vtxAttr.g0.Tex0CoordFormat, vtxAttr.g1.Tex1CoordFormat, vtxAttr.g1.Tex2CoordFormat,
		vtxAttr.g1.Tex3CoordFormat, vtxAttr.g1.Tex4CoordFormat, vtxAttr.g2.Tex5CoordFormat,
		vtxAttr.g2.Tex6CoordFormat, vtxAttr.g2.Tex7CoordFormat
	};

	// Add position and texture matrix indices
	u64 vtxDescHex = cpMem.vtxDesc.Hex;
	for (int i = 0; i < 9; ++i)
	{
		sizes[i] = vtxDescHex & 1;
		vtxDescHex >>= 1;
	}

	// Position
	sizes[9] = VertexLoader_Position::GetSize(vtxDesc.Position, vtxAttr.g0.PosFormat, vtxAttr.g0.PosElements);

	// Normals
	if (vtxDesc.Normal != NOT_PRESENT)
	{
		sizes[10] = VertexLoader_Normal::GetSize(vtxDesc.Normal, vtxAttr.g0.NormalFormat, vtxAttr.g0.NormalElements, vtxAttr.g0.NormalIndex3);
	}
	else
	{
		sizes[10] = 0;
	}

	// Colors
	for (int i = 0; i < 2; i++)
	{
		int size = 0;

		switch (colDesc[i])
		{
		case NOT_PRESENT:
			break;
		case DIRECT:
			switch (colComp[i])
			{
			case FORMAT_16B_565:  size = 2; break;
			case FORMAT_24B_888:  size = 3; break;
			case FORMAT_32B_888x: size = 4; break;
			case FORMAT_16B_4444: size = 2; break;
			case FORMAT_24B_6666: size = 3; break;
			case FORMAT_32B_8888: size = 4; break;
			default: _assert_(0); break;
			}
			break;
		case INDEX8:
			size = 1;
			break;
		case INDEX16:
			size = 2;
			break;
		}

		sizes[11 + i] = size;
	}

	// Texture coordinates
	vtxDescHex = vtxDesc.Hex >> 17;
	for (int i = 0; i < 8; i++)
	{
		sizes[13 + i] = VertexLoader_TextCoord::GetSize(vtxDescHex & 3, tcFormat[i], tcElements[i]);
		vtxDescHex >>= 2;
	}
}

}