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/*
*
* Copyright (C) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* 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; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*
*/
// -*- C++ -*-
/*
* Copyright (C) 1990,91 Silicon Graphics, Inc.
*
_______________________________________________________________________
______________ S I L I C O N G R A P H I C S I N C . ____________
|
| $Revision: 1.1.1.1 $
|
| Description:
| This file defines the SoGLUpdateAreaElement class.
|
| Author(s) : Paul S. Strauss
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#ifndef _SO_UPDATE_AREA_ELEMENT
#define _SO_UPDATE_AREA_ELEMENT
#include <Inventor/SbLinear.h>
#include <Inventor/elements/SoSubElement.h>
//////////////////////////////////////////////////////////////////////////////
//
// Class: SoGLUpdateAreaElement
//
// Element that stores the rectangular area within the current
// viewport region that needs to be updated when rendering. It can be
// used for partial rendering updates when applications know that
// only a portion of the objects need to be rerendered. Cameras can
// use the info in this element to set up a view volume against which
// culling can be performed. This element also sets up the GL scissor
// box to limit drawing.
//
// The update area is specified in normalized viewport coordinates,
// where (0,0) is the lower left corner of the viewport and (1,1) is
// the upper right corner. The area is given as an origin and a size.
//
//////////////////////////////////////////////////////////////////////////////
SoEXTENDER class SoGLUpdateAreaElement : public SoElement {
SO_ELEMENT_HEADER(SoGLUpdateAreaElement);
public:
// Initializes element
virtual void init(SoState *state);
// Sets the current update area in the state. May have GL side effects.
static void set(SoState *state,
const SbVec2f &origin, const SbVec2f &size);
// Returns current update area from the state. Returns TRUE if the
// update area is the default, namely, the entire viewport.
static SbBool get(SoState *state, SbVec2f &origin, SbVec2f &size);
// Returns the default update area origin and size
static SbVec2f getDefaultOrigin() { return SbVec2f(0.0, 0.0); }
static SbVec2f getDefaultSize() { return SbVec2f(1.0, 1.0); }
// Override push() and pop() methods to keep GL up to date
virtual void push(SoState *state);
virtual void pop(SoState *state, const SoElement *prevTopElement);
// Returns TRUE if the update areas match in both elements
virtual SbBool matches(const SoElement *elt) const;
// Create and return a copy of this element
virtual SoElement *copyMatchInfo() const;
// Prints element (for debugging)
virtual void print(FILE *fp) const;
SoINTERNAL public:
// Initializes the SoGLUpdateAreaElement class
static void initClass();
protected:
SbVec2f origin, size;
virtual ~SoGLUpdateAreaElement();
private:
// This flag lets us know if the element is set to its initial
// default value, which is not sent to GL. This is so we can tell
// whether the GL value is up to date.
SbBool isDefault;
// Sends region in element to GL
void send(SoState *state);
};
#endif /* _SO_UPDATE_AREA_ELEMENT */
|
