/** * @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 "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::getScaleFactor().mV[VX]); y = llfloor(rect.mBottom * LLUI::getScaleFactor().mV[VY]); w = llmax(0, llceil(rect.getWidth() * LLUI::getScaleFactor().mV[VX])) + 1; h = llmax(0, llceil(rect.getHeight() * LLUI::getScaleFactor().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() {}