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Diffstat (limited to 'indra/llui/lllocalcliprect.cpp')
| -rw-r--r-- | indra/llui/lllocalcliprect.cpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/indra/llui/lllocalcliprect.cpp b/indra/llui/lllocalcliprect.cpp new file mode 100644 index 0000000000..058b6ae178 --- /dev/null +++ b/indra/llui/lllocalcliprect.cpp @@ -0,0 +1,143 @@ +/** +* @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 "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; + + 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; +} |