111 lines
2.9 KiB
C++
111 lines
2.9 KiB
C++
/**
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* @file lllocalcliprect.cpp
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*
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* $LicenseInfo:firstyear=2009&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#include "linden_common.h"
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#include "lllocalcliprect.h"
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#include "llfontgl.h"
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#include "llui.h"
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/*static*/ std::stack<LLRect> LLScreenClipRect::sClipRectStack;
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LLScreenClipRect::LLScreenClipRect(const LLRect& rect, BOOL enabled)
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: mScissorState(GL_SCISSOR_TEST),
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mEnabled(enabled)
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{
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if (mEnabled)
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{
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pushClipRect(rect);
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mScissorState.setEnabled(!sClipRectStack.empty());
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updateScissorRegion();
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}
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}
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LLScreenClipRect::~LLScreenClipRect()
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{
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if (mEnabled)
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{
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popClipRect();
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updateScissorRegion();
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}
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}
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//static
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void LLScreenClipRect::pushClipRect(const LLRect& rect)
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{
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LLRect combined_clip_rect = rect;
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if (!sClipRectStack.empty())
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{
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LLRect top = sClipRectStack.top();
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combined_clip_rect.intersectWith(top);
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if(combined_clip_rect.isEmpty())
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{
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// avoid artifacts where zero area rects show up as lines
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combined_clip_rect = LLRect::null;
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}
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}
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sClipRectStack.push(combined_clip_rect);
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}
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//static
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void LLScreenClipRect::popClipRect()
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{
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sClipRectStack.pop();
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}
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//static
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void LLScreenClipRect::updateScissorRegion()
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{
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if (sClipRectStack.empty()) return;
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// finish any deferred calls in the old clipping region
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gGL.flush();
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LLRect rect = sClipRectStack.top();
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stop_glerror();
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S32 x,y,w,h;
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x = llfloor(rect.mLeft * LLUI::getScaleFactor().mV[VX]);
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y = llfloor(rect.mBottom * LLUI::getScaleFactor().mV[VY]);
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w = llmax(0, llceil(rect.getWidth() * LLUI::getScaleFactor().mV[VX])) + 1;
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h = llmax(0, llceil(rect.getHeight() * LLUI::getScaleFactor().mV[VY])) + 1;
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glScissor( x,y,w,h );
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stop_glerror();
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}
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//---------------------------------------------------------------------------
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// LLLocalClipRect
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//---------------------------------------------------------------------------
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LLLocalClipRect::LLLocalClipRect(const LLRect& rect, BOOL enabled /* = TRUE */)
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: LLScreenClipRect(LLRect(rect.mLeft + LLFontGL::sCurOrigin.mX,
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rect.mTop + LLFontGL::sCurOrigin.mY,
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rect.mRight + LLFontGL::sCurOrigin.mX,
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rect.mBottom + LLFontGL::sCurOrigin.mY), enabled)
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{}
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LLLocalClipRect::~LLLocalClipRect()
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{}
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