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/**
* @file lllocalcliprect.cpp
*
* $LicenseInfo:firstyear=2009&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library 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 Foundation;
* version 2.1 of the License only.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "lllocalcliprect.h"
#include "llfontgl.h"
#include "llgl.h"
#include "llui.h"
#include <stack>
//---------------------------------------------------------------------------
// LLScreenClipRect
// implementation class in screen space
//---------------------------------------------------------------------------
class LLScreenClipRect
{
public:
LLScreenClipRect(const LLRect& rect, BOOL enabled = TRUE);
virtual ~LLScreenClipRect();
private:
static void pushClipRect(const LLRect& rect);
static void popClipRect();
static void updateScissorRegion();
private:
LLGLState mScissorState;
BOOL mEnabled;
static std::stack<LLRect> sClipRectStack;
};
/*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 */)
{
LLRect screen(rect.mLeft + LLFontGL::sCurOrigin.mX,
rect.mTop + LLFontGL::sCurOrigin.mY,
rect.mRight + LLFontGL::sCurOrigin.mX,
rect.mBottom + LLFontGL::sCurOrigin.mY);
mScreenClipRect = new LLScreenClipRect(screen, enabled);
}
LLLocalClipRect::~LLLocalClipRect()
{
delete mScreenClipRect;
mScreenClipRect = NULL;
}
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