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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 SoGLTextureEnabledElement class.
|
| Author(s) : Gavin Bell
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#ifndef _SO_GL_TEXTURE_ENABLED_ELEMENT
#define _SO_GL_TEXTURE_ENABLED_ELEMENT
#include <Inventor/elements/SoInt32Element.h>
//////////////////////////////////////////////////////////////////////////////
//
// Class: SoGLTextureEnabledElement
//
// Element that enables/disables textures. This is implemented as a
// separate element from the TextureImageElement so the texture image
// can be changed without blowing caches containing shapes-- shapes
// need to know if texturing is going on or not so they can decide to
// send down texture coordinates or not.
//
// This is set by the GLTextureImageElement and the
// GLTextureImageElement; the interaction between the three is a
// little complicated. Each of the other two elements always sets up
// the GL texture state appropriately; however, texturing is only
// enabled if both elements agree that it should be enabled (they
// check each other's value before calling set).
//
// This element cannot be overridden, but, since the elements that
// set it check each other's value, overriding those elements has
// the same effect.
//
//////////////////////////////////////////////////////////////////////////////
SoEXTENDER class SoGLTextureEnabledElement :
public SoInt32Element {
SO_ELEMENT_HEADER(SoGLTextureEnabledElement);
public:
// Initializes element
virtual void init(SoState *state);
// Used by GLTextureImageElement, set to TRUE when a non-null
// image is set, set to FALSE when there is no texture image (the
// default).
static void set(SoState *state, SbBool value);
#ifndef IV_STRICT
static void set(SoState *state, SoNode *, SbBool value)
{ set(state, value); }
#endif
// Used by shapes to figure out if they need to send texture
// coordinates:
static SbBool get(SoState *state)
{ return (SbBool)SoInt32Element::get(classStackIndex, state); }
// By default there is not texture
static SbBool getDefault() { return FALSE; }
// Override push() so we can remember previous elements value and
// avoid making GL calls if this element has the same value.
virtual void push(SoState *state);
// Override pop() method so side effects can occur in GL
virtual void pop(SoState *state, const SoElement *prevTopElement);
SoINTERNAL public:
// Initializes the SoGLTextureEnabledElement class
static void initClass();
// Override base class set to make GL calls.
virtual void setElt(int32_t value);
virtual ~SoGLTextureEnabledElement();
private:
// We save the state to figure out if the lastPattern variable was
// copied from a parent element; if it was, then caches will have
// to depend on that element because if it changes we have to have
// a chance to change our decision about what GL calls to make.
// If this is NULL, then there are no cache dependencies.
SoState * copiedFromParent;
// Sends enabled in element to GL
void send();
};
#endif /* _SO_GL_TEXTURE_ENABLED_ELEMENT */
|
