109 lines
4.7 KiB
C++
109 lines
4.7 KiB
C++
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/**************************************************************************************/
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/* */
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/* Visualization Library */
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/* http://visualizationlibrary.org */
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/* */
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/* Copyright (c) 2005-2020, Michele Bosi */
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/* All rights reserved. */
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/* */
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/* Redistribution and use in source and binary forms, with or without modification, */
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/* are permitted provided that the following conditions are met: */
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/* */
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/* - Redistributions of source code must retain the above copyright notice, this */
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/* list of conditions and the following disclaimer. */
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/* */
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/* - Redistributions in binary form must reproduce the above copyright notice, this */
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/* list of conditions and the following disclaimer in the documentation and/or */
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/* other materials provided with the distribution. */
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/* */
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/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND */
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/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED */
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/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
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/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR */
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/* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES */
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/* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
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/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON */
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/* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
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/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS */
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/* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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/* */
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/**************************************************************************************/
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#ifndef Scissor_INCLUDE_ONCE
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#define Scissor_INCLUDE_ONCE
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#include <vlCore/Object.hpp>
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#include <vlCore/Rect.hpp>
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#include <vlGraphics/Viewport.hpp>
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namespace vl
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{
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/**
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* The Scissor class wraps the OpenGL function glScissor(), see http://www.opengl.org/sdk/docs/man/xhtml/glScissor.xml for more information.
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* \sa
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* - Actor::setScissor()
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* - Shader::setScissor()
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*/
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class Scissor: public Object
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{
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VL_INSTRUMENT_CLASS(vl::Scissor, Object)
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public:
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Scissor() {}
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Scissor(int x, int y, int width, int height)
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{
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setScissor(x,y,width,height);
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}
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/**
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* Enables the scissor test on the area specified by scissorRect() clipped against the given Viewport.
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*/
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void enable(const Viewport* viewport) const
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{
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RectI r = viewport->rect().intersected(scissorRect());
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glEnable(GL_SCISSOR_TEST);
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if (r.isNull())
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glScissor(0,0,0,0);
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else
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glScissor(r.x(), r.y(), r.width(), r.height());
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}
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/**
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* Disables the scissor test.
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*/
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void disable()
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{
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glDisable(GL_SCISSOR_TEST);
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}
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/**
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* Defines the scissor box.
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* The \p left, \p bottom, \p right and \p top parameters are in windows coordinates.
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* See also http://www.opengl.org/sdk/docs/man/xhtml/glScissor.xml for more information.
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*/
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void setScissor(int x, int y, int width, int height) { setScissor( RectI(x,y,width,height) ); }
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/**
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* Defines the scissor box.
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* The \p left, \p bottom, \p right and \p top parameters are in windows coordinates.
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* See also http://www.opengl.org/sdk/docs/man/xhtml/glScissor.xml for more information.
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*/
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void setScissor(const RectI& scissor) { mScissor = scissor; }
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/**
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* Returns the scissor box.
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*/
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const RectI& scissorRect() const { return mScissor; }
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/**
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* Defines a sort of lexicographic sorting that make possible the use of the Scissor class with STL containers like std::set, std::map etc.
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*/
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bool operator<(const Scissor& other) const
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{
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return mScissor < other.mScissor;
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}
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protected:
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RectI mScissor;
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};
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}
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#endif
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