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Diffstat (limited to '')
-rw-r--r-- | src/menu/clipping_helper.cpp | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/menu/clipping_helper.cpp b/src/menu/clipping_helper.cpp new file mode 100644 index 00000000..b03a4e8c --- /dev/null +++ b/src/menu/clipping_helper.cpp @@ -0,0 +1,70 @@ +/* + * UltraStar Deluxe - Karaoke Game + * + * UltraStar Deluxe is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + * + * $URL$ + * $Id$ + */ + +#include "clipping_helper.hpp" + +namespace usdx +{ + log4cpp::Category& ClippingHelper::log = + log4cpp::Category::getInstance("usdx.menu.clipping_helper"); + + ClippingHelper::ClippingHelper(const Rectangle<int> &rect) + { + was_enabled = glIsEnabled(GL_SCISSOR_TEST); + + // calculate intersection of old clipping and requested clipping + Rectangle<int> new_scissor_box(rect); + + if (was_enabled) { + glGetIntegerv(GL_SCISSOR_BOX, scissor_box); + new_scissor_box = rect.intersect(Rectangle<int>(scissor_box)); + } + + log << log4cpp::Priority::DEBUG << "Clipping (" + << new_scissor_box.get_width() << ", " + << new_scissor_box.get_height() << ") at window offset: (" + << new_scissor_box.get_x() << ", " + << new_scissor_box.get_y() << ")"; + + // setup clipping box + glScissor(new_scissor_box.get_x(), new_scissor_box.get_y(), + new_scissor_box.get_width(), new_scissor_box.get_height()); + + // enable clipping + glEnable(GL_SCISSOR_TEST); + } + + ClippingHelper::~ClippingHelper() + { + // restore old clipping settings + glScissor(scissor_box[0], scissor_box[1], scissor_box[2], + scissor_box[3]); + + if (! was_enabled) { + glDisable(GL_SCISSOR_TEST); + } + } +}; |