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/**
* @file lllocalcliprect.cpp
*
* $LicenseInfo:firstyear=2009&license=viewergpl$
*
* Copyright (c) 2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "lllocalcliprect.h"
#include "llfontgl.h"
#include "llui.h"
/*static*/ std::stack<LLRect> LLScreenClipRect::sClipRectStack;
LLScreenClipRect::LLScreenClipRect(const LLRect& rect, BOOL enabled)
: mScissorState(GL_SCISSOR_TEST),
mEnabled(enabled)
{
if (mEnabled)
{
pushClipRect(rect);
mScissorState.setEnabled(!sClipRectStack.empty());
updateScissorRegion();
}
}
LLScreenClipRect::~LLScreenClipRect()
{
if (mEnabled)
{
popClipRect();
updateScissorRegion();
}
}
//static
void LLScreenClipRect::pushClipRect(const LLRect& rect)
{
LLRect combined_clip_rect = rect;
if (!sClipRectStack.empty())
{
LLRect top = sClipRectStack.top();
combined_clip_rect.intersectWith(top);
if(combined_clip_rect.isEmpty())
{
// avoid artifacts where zero area rects show up as lines
combined_clip_rect = LLRect::null;
}
}
sClipRectStack.push(combined_clip_rect);
}
//static
void LLScreenClipRect::popClipRect()
{
sClipRectStack.pop();
}
//static
void LLScreenClipRect::updateScissorRegion()
{
if (sClipRectStack.empty()) return;
// finish any deferred calls in the old clipping region
gGL.flush();
LLRect rect = sClipRectStack.top();
stop_glerror();
S32 x,y,w,h;
x = llfloor(rect.mLeft * LLUI::sGLScaleFactor.mV[VX]);
y = llfloor(rect.mBottom * LLUI::sGLScaleFactor.mV[VY]);
w = llmax(0, llceil(rect.getWidth() * LLUI::sGLScaleFactor.mV[VX])) + 1;
h = llmax(0, llceil(rect.getHeight() * LLUI::sGLScaleFactor.mV[VY])) + 1;
glScissor( x,y,w,h );
stop_glerror();
}
//---------------------------------------------------------------------------
// LLLocalClipRect
//---------------------------------------------------------------------------
LLLocalClipRect::LLLocalClipRect(const LLRect& rect, BOOL enabled /* = TRUE */)
: LLScreenClipRect(LLRect(rect.mLeft + LLFontGL::sCurOrigin.mX,
rect.mTop + LLFontGL::sCurOrigin.mY,
rect.mRight + LLFontGL::sCurOrigin.mX,
rect.mBottom + LLFontGL::sCurOrigin.mY), enabled)
{}
LLLocalClipRect::~LLLocalClipRect()
{}
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