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

// This is currently only used by the DX backend, but it may make sense to
// use it in the GL backend or a future DX10 backend too.

#pragma once

#include "Common/CommonTypes.h"

class IndexGenerator
{
public:
	// Init
	static void Init();
	static void Start(u16 *Indexptr);

	static void AddIndices(int primitive, u32 numVertices);

	// returns numprimitives
	static u32 GetNumVerts() {return base_index;}

	static u32 GetIndexLen() {return (u32)(index_buffer_current - BASEIptr);}

	static u32 GetRemainingIndices();

private:
	// Triangles
	template <bool pr> static u16* AddList(u16 *Iptr, u32 numVerts, u32 index);
	template <bool pr> static u16* AddStrip(u16 *Iptr, u32 numVerts, u32 index);
	template <bool pr> static u16* AddFan(u16 *Iptr, u32 numVerts, u32 index);
	template <bool pr> static u16* AddQuads(u16 *Iptr, u32 numVerts, u32 index);
	template <bool pr> static u16* AddQuads_nonstandard(u16 *Iptr, u32 numVerts, u32 index);

	// Lines
	static u16* AddLineList(u16 *Iptr, u32 numVerts, u32 index);
	static u16* AddLineStrip(u16 *Iptr, u32 numVerts, u32 index);

	// Points
	static u16* AddPoints(u16 *Iptr, u32 numVerts, u32 index);

	template <bool pr> static u16* WriteTriangle(u16 *Iptr, u32 index1, u32 index2, u32 index3);

	static u16 *index_buffer_current;
	static u16 *BASEIptr;
	static u32 base_index;
};