/*
 *	Copyright (C) 2007-2009 Gabest
 *	http://www.gabest.org
 *
 *  This Program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This Program 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 GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA USA.
 *  http://www.gnu.org/copyleft/gpl.html
 *
 */

#include "stdafx.h"
#include "GSTextureCacheSW.h"

GSTextureCacheSW::GSTextureCacheSW(GSState* state)
	: m_state(state)
{
}

GSTextureCacheSW::~GSTextureCacheSW()
{
	RemoveAll();
}

GSTextureCacheSW::Texture* GSTextureCacheSW::Lookup(const GIFRegTEX0& TEX0, const GIFRegTEXA& TEXA, uint32 tw0)
{
	const GSLocalMemory::psm_t& psm = GSLocalMemory::m_psm[TEX0.PSM];

	auto& m = m_map[TEX0.TBP0 >> 5];

	for(auto i = m.begin(); i != m.end(); ++i)
	{
		Texture* t = *i;

		if(((TEX0.u32[0] ^ t->m_TEX0.u32[0]) | ((TEX0.u32[1] ^ t->m_TEX0.u32[1]) & 3)) != 0) // TBP0 TBW PSM TW TH
		{
			continue;
		}

		if((psm.trbpp == 16 || psm.trbpp == 24) && TEX0.TCC && TEXA != t->m_TEXA)
		{
			continue;
		}

		if(tw0 != 0 && t->m_tw != tw0)
		{
			continue;
		}

		// Lookup hit
		m.MoveFront(i.Index());
		t->m_age = 0;
		return t;
	}

	// Lookup miss
	Texture* t = new Texture(m_state, tw0, TEX0, TEXA);

	m_textures.insert(t);

	for(const uint32* p = t->m_pages.n; *p != GSOffset::EOP; p++)
	{
		const uint32 page = *p;
		t->m_erase_it[page] = m_map[page].InsertFront(t);
	}

	return t;
}

void GSTextureCacheSW::InvalidatePages(const uint32* pages, uint32 psm)
{
	for(const uint32* p = pages; *p != GSOffset::EOP; p++)
	{
		const uint32 page = *p;
		
		for(Texture* t : m_map[page])
		{
			if(GSUtil::HasSharedBits(psm, t->m_sharedbits))
			{
				uint32* RESTRICT valid = t->m_valid;

				if(t->m_repeating)
				{
					for(const GSVector2i& j : t->m_p2t[page])
					{
						valid[j.x] &= j.y;
					}
				}
				else
				{
					valid[page] = 0;
				}

				t->m_complete = false;
			}
		}
	}
}

void GSTextureCacheSW::RemoveAll()
{
	for(auto i : m_textures) delete i;

	m_textures.clear();

	for(auto& l : m_map)
	{
		l.clear();
	}
}

void GSTextureCacheSW::IncAge()
{
	for(auto i = m_textures.begin(); i != m_textures.end(); )
	{
		Texture* t = *i;

		if(++t->m_age > 10)
		{
			i = m_textures.erase(i);

			for(const uint32* p = t->m_pages.n; *p != GSOffset::EOP; p++)
			{
				const uint32 page = *p;
				m_map[page].EraseIndex(t->m_erase_it[page]);
			}

			delete t;
		}
		else
		{
			++i;
		}
	}
}

//

GSTextureCacheSW::Texture::Texture(GSState* state, uint32 tw0, const GIFRegTEX0& TEX0, const GIFRegTEXA& TEXA)
	: m_state(state)
	, m_buff(NULL)
	, m_tw(tw0)
	, m_age(0)
	, m_complete(false)
	, m_p2t(NULL)
{
	m_TEX0 = TEX0;
	m_TEXA = TEXA;

	if(m_tw == 0)
	{
		m_tw = std::max<int>(m_TEX0.TW, GSLocalMemory::m_psm[m_TEX0.PSM].pal == 0 ? 3 : 5); // makes one row 32 bytes at least, matches the smallest block size that is allocated for m_buff
	}

	memset(m_valid, 0, sizeof(m_valid));

	m_sharedbits = GSUtil::HasSharedBitsPtr(m_TEX0.PSM);

	m_offset = m_state->m_mem.GetOffset(TEX0.TBP0, TEX0.TBW, TEX0.PSM);

	m_pages.n = m_offset->GetPages(GSVector4i(0, 0, 1 << TEX0.TW, 1 << TEX0.TH));
	memcpy(m_pages.bm, m_offset->GetPagesAsBits(TEX0), sizeof(m_pages.bm));

	m_repeating = m_TEX0.IsRepeating(); // repeating mode always works, it is just slightly slower

	if(m_repeating)
	{
		m_p2t = m_state->m_mem.GetPage2TileMap(m_TEX0);
	}
}

GSTextureCacheSW::Texture::~Texture()
{
	delete [] m_pages.n;

	if(m_buff)
	{
		_aligned_free(m_buff);
	}
}

bool GSTextureCacheSW::Texture::Update(const GSVector4i& rect)
{
	if(m_complete)
	{
		return true;
	}

	const GSLocalMemory::psm_t& psm = GSLocalMemory::m_psm[m_TEX0.PSM];

	GSVector2i bs = psm.bs;

	int shift = psm.pal == 0 ? 2 : 0;

	int tw = std::max<int>(1 << m_TEX0.TW, bs.x);
	int th = std::max<int>(1 << m_TEX0.TH, bs.y);

	GSVector4i r = rect;

	r = r.ralign<Align_Outside>(bs);

	if(r.eq(GSVector4i(0, 0, tw, th)))
	{
		m_complete = true; // lame, but better than nothing
	}

	if(m_buff == NULL)
	{
		uint32 pitch = (1 << m_tw) << shift;
		
		m_buff = _aligned_malloc(pitch * th * 4, 32);

		if(m_buff == NULL)
		{
			return false;
		}
	}

	GSLocalMemory& mem = m_state->m_mem;

	const GSOffset* RESTRICT off = m_offset;

	uint32 blocks = 0;

	GSLocalMemory::readTextureBlock rtxbP = psm.rtxbP;

	uint32 pitch = (1 << m_tw) << shift;

	uint8* dst = (uint8*)m_buff + pitch * r.top;

	int block_pitch = pitch * bs.y;

	r = r.srl32(3);

	bs.x >>= 3;
	bs.y >>= 3;

	shift += 3;

	if(m_repeating)
	{
		for(int y = r.top; y < r.bottom; y += bs.y, dst += block_pitch)
		{
			uint32 base = off->block.row[y];

			for(int x = r.left, i = (y << 7) + x; x < r.right; x += bs.x, i += bs.x)
			{
				uint32 block = (base + off->block.col[x]) % MAX_BLOCKS;

				uint32 row = i >> 5;
				uint32 col = 1 << (i & 31);

				if((m_valid[row] & col) == 0)
				{
					m_valid[row] |= col;

					(mem.*rtxbP)(block, &dst[x << shift], pitch, m_TEXA);

					blocks++;
				}
			}
		}
	}
	else
	{
		for(int y = r.top; y < r.bottom; y += bs.y, dst += block_pitch)
		{
			uint32 base = off->block.row[y];

			for(int x = r.left; x < r.right; x += bs.x)
			{
				uint32 block = (base + off->block.col[x]) % MAX_BLOCKS;

				uint32 row = block >> 5;
				uint32 col = 1 << (block & 31);

				if((m_valid[row] & col) == 0)
				{
					m_valid[row] |= col;

					(mem.*rtxbP)(block, &dst[x << shift], pitch, m_TEXA);

					blocks++;
				}
			}
		}
	}

	if(blocks > 0)
	{
		m_state->m_perfmon.Put(GSPerfMon::Unswizzle, bs.x * bs.y * blocks << shift);
	}

	return true;
}

#include "GSTextureSW.h"

bool GSTextureCacheSW::Texture::Save(const string& fn, bool dds) const
{
	const uint32* RESTRICT clut = m_state->m_mem.m_clut;

	int w = 1 << m_TEX0.TW;
	int h = 1 << m_TEX0.TH;

	GSTextureSW t(0, w, h);

	GSTexture::GSMap m;

	if(t.Map(m, NULL))
	{
		const GSLocalMemory::psm_t& psm = GSLocalMemory::m_psm[m_TEX0.PSM];

		const uint8* RESTRICT src = (uint8*)m_buff;
		int pitch = 1 << (m_tw + (psm.pal == 0 ? 2 : 0));

		for(int j = 0; j < h; j++, src += pitch, m.bits += m.pitch)
		{
			if(psm.pal == 0)
			{
				memcpy(m.bits, src, sizeof(uint32) * w);
			}
			else
			{
				for(int i = 0; i < w; i++)
				{
					((uint32*)m.bits)[i] = clut[src[i]];
				}
			}
		}

		t.Unmap();

		return t.Save(fn);
	}

	return false;
}