147 lines
3.9 KiB
C++
147 lines
3.9 KiB
C++
/**
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* @file lllocalcliprect.cpp
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*
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* $LicenseInfo:firstyear=2009&license=viewergpl$
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*
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* Copyright (c) 2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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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 "llgl.h"
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#include "llui.h"
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#include <stack>
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//---------------------------------------------------------------------------
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// LLScreenClipRect
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// implementation class in screen space
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//---------------------------------------------------------------------------
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class LLScreenClipRect
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{
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public:
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LLScreenClipRect(const LLRect& rect, BOOL enabled = TRUE);
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virtual ~LLScreenClipRect();
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private:
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static void pushClipRect(const LLRect& rect);
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static void popClipRect();
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static void updateScissorRegion();
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private:
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LLGLState mScissorState;
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BOOL mEnabled;
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static std::stack<LLRect> sClipRectStack;
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};
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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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}
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mScissorState.setEnabled(!sClipRectStack.empty());
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updateScissorRegion();
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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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}
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updateScissorRegion();
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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::sGLScaleFactor.mV[VX]);
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y = llfloor(rect.mBottom * LLUI::sGLScaleFactor.mV[VY]);
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w = llmax(0, llceil(rect.getWidth() * LLUI::sGLScaleFactor.mV[VX])) + 1;
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h = llmax(0, llceil(rect.getHeight() * LLUI::sGLScaleFactor.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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{
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LLRect screen(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);
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mScreenClipRect = new LLScreenClipRect(screen, enabled);
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}
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LLLocalClipRect::~LLLocalClipRect()
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{
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delete mScreenClipRect;
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mScreenClipRect = NULL;
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}
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