/*  PCSX2 - PS2 Emulator for PCs
 *  Copyright (C) 2002-2021 PCSX2 Dev Team
 *
 *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU Lesser General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with PCSX2.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include "GS/Renderers/Common/GSRenderer.h"
#include "GS/Renderers/Common/GSFastList.h"
#include <unordered_set>

class GSTextureCacheSW
{
public:
	class Texture
	{
	public:
		GSState* m_state;
		GSOffset m_offset;
		GSOffset::PageLooper m_pages;
		GIFRegTEX0 m_TEX0;
		GIFRegTEXA m_TEXA;
		void* m_buff;
		u32 m_tw;
		u32 m_age;
		bool m_complete;
		bool m_repeating;
		std::vector<GSVector2i>* m_p2t;
		u32 m_valid[MAX_PAGES];
		std::array<u16, MAX_PAGES> m_erase_it;
		const u32* RESTRICT m_sharedbits;

		// m_valid
		// fast mode: each u32 bits map to the 32 blocks of that page
		// repeating mode: 1 bpp image of the texture tiles (8x8), also having 512 elements is just a coincidence (worst case: (1024*1024)/(8*8)/(sizeof(u32)*8))

		Texture(GSState* state, u32 tw0, const GIFRegTEX0& TEX0, const GIFRegTEXA& TEXA);
		virtual ~Texture();

		bool Update(const GSVector4i& r);
		bool Save(const std::string& fn, bool dds = false) const;
	};

protected:
	GSState* m_state;
	std::unordered_set<Texture*> m_textures;
	std::array<FastList<Texture*>, MAX_PAGES> m_map;

public:
	GSTextureCacheSW(GSState* state);
	virtual ~GSTextureCacheSW();

	Texture* Lookup(const GIFRegTEX0& TEX0, const GIFRegTEXA& TEXA, u32 tw0 = 0);

	void InvalidatePages(const GSOffset::PageLooper& pages, u32 psm);

	void RemoveAll();
	void IncAge();
};
