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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.
*
*/
#ifndef CLIPPING_HELPER_HPP
#define CLIPPING_HELPER_HPP
#include <GL/gl.h>
#include <log4cpp/Category.hh>
#include "utils/rectangle.hpp"
#include "container.hpp"
namespace usdx
{
/**
* ClippingHelper is a class for handling multiple nested clipping areas. It
* handles the set up (during construction) and the tear down (during
* deconstruction) of the new clipping. It also preserves the clipping
* settings before using this class.
*
* This class is perfeclty suited for using it in a single scope to cleanup
* the new clipping at the end of the current scope.
*/
class ClippingHelper
{
private:
static log4cpp::Category& log;
/**
* Whether clipping was enabled before it is setup by this helper. If it
* was enabled, it should not be disabled afterwards and the resulting
* clipping rectangle should be the intersection between the old and the
* new clipping area.
*/
GLboolean was_enabled;
/**
* Buffer to cache the old clipping area and resore if afterwards.
*/
GLint scissor_box[4];
/**
* Helper to create a Rectangle<int> object out of an GLint array. This
* array is returned by glGetIntegerv with GL_SCISSOR_BOX. The helper is
* used for converting the OpenGL array to the common internal format.
*/
static Rectangle<int> makeRect(GLint box[4]);
public:
ClippingHelper(const Container*, const Rectangle<int>&);
virtual ~ClippingHelper();
};
};
#endif
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