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/*
* 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.
*
*/
#include "clipping_helper.hpp"
namespace usdx
{
log4cpp::Category& ClippingHelper::log =
log4cpp::Category::getInstance("usdx.menu.clipping_helper");
Rectangle<int> ClippingHelper::makeRect(GLint box[4])
{
return Rectangle<int>(Point<int>(box[0], box[1]),
Point<int>(box[0] + box[2], box[1] + box[3]));
}
ClippingHelper::ClippingHelper(const Container *parent,
const Rectangle<int> &rect)
{
was_enabled = glIsEnabled(GL_SCISSOR_TEST);
Rectangle<int> new_scissor_box(rect);
// calculate window coordinates of rectangle
if (parent) {
int offset = parent->get_size().get_height() - rect.get_bottom();
new_scissor_box.set_top(parent->get_window_coords().get_y() +
offset);
new_scissor_box.set_left(parent->get_window_coords().get_x() +
rect.get_left());
}
// calculate intersection of old clipping and requested clipping
if (was_enabled) {
glGetIntegerv(GL_SCISSOR_BOX, scissor_box);
new_scissor_box = new_scissor_box.intersect(makeRect(scissor_box));
}
// setup clipping box
glScissor(new_scissor_box.get_left(), new_scissor_box.get_top(),
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);
}
}
}
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