/*
 *	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 "GSTexture.h"

GSTexture::GSTexture()
	: m_scale(1, 1)
	, m_size(0, 0)
	, m_committed_size(0, 0)
	, m_gpu_page_size(0, 0)
	, m_type(0)
	, m_format(0)
	, m_sparse(false)
	, last_frame_used(0)
	, LikelyOffset(false)
	, OffsetHack_modx(0.0f)
	, OffsetHack_mody(0.0f)
{
}

void GSTexture::CommitRegion(const GSVector2i& region)
{
	if (!m_sparse)
		return;

	GSVector2i aligned_region = RoundUpPage(region);
	aligned_region.x = std::max(m_committed_size.x, aligned_region.x);
	aligned_region.y = std::max(m_committed_size.y, aligned_region.y);
	if (aligned_region != m_committed_size)
		CommitPages(aligned_region, true);
}

void GSTexture::Commit()
{
	if (!m_sparse)
		return;

	if (m_committed_size != m_size)
		CommitPages(m_size, true);
}

void GSTexture::Uncommit()
{
	if (!m_sparse)
		return;

	GSVector2i zero = GSVector2i(0, 0);

	if (m_committed_size != zero)
		CommitPages(m_committed_size, false);
}

void GSTexture::SetGpuPageSize(const GSVector2i& page_size)
{
	ASSERT(std::bitset<32>(page_size.x + 1).count() == 1);
	ASSERT(std::bitset<32>(page_size.y + 1).count() == 1);

	m_gpu_page_size = page_size;
}

GSVector2i GSTexture::RoundUpPage(GSVector2i v)
{
	v.x = std::min(m_size.x, v.x);
	v.y = std::min(m_size.y, v.y);
	v.x += m_gpu_page_size.x;
	v.y += m_gpu_page_size.y;
	v.x &= ~m_gpu_page_size.x;
	v.y &= ~m_gpu_page_size.y;

	return v;
}