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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* 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
* OpenSceneGraph Public License for more details.
*/
/// author: Julien Valentin 2017 (mp3butcher@hotmail.com)
#ifndef _GLImageUnitBinding_H
#define _GLImageUnitBinding_H
#include <osg/Export>
#include <osg/Texture>
namespace osg
{
/** Bind texture to an image unit (available only if GL version is 4.2 or greater)
* The format parameter for the image unit need not exactly match the texture internal format,
* but if it is set to 0, the texture internal format will be used.
* See http://www.opengl.org/registry/specs/ARB/shader_image_load_store.txt
* void bindToImageUnit(unsigned int unit, GLenum access, GLenum format=0, int level=0, bool layered=false, int layer=0);
**/
class OSG_EXPORT BindImageTexture : public osg::StateAttribute {
public:
/** Type of access that will be performed on the texture image. */
enum Access
{
NOT_USED = 0,
READ_ONLY = GL_READ_ONLY_ARB,
WRITE_ONLY = GL_WRITE_ONLY_ARB,
READ_WRITE = GL_READ_WRITE_ARB
};
BindImageTexture(
GLuint imageunit = 0,
osg::Texture* target = 0,
Access access = READ_ONLY,
GLenum format = GL_RGBA8,
int level = 0,
bool layered = GL_FALSE,
int layer = 0) : osg::StateAttribute(),
_target(target),
_imageunit(imageunit),
_level(level),
_layered(layered),
_layer(layer),
_access(access),
_format(format) {}
BindImageTexture( const BindImageTexture&o,osg::CopyOp op=osg::CopyOp::SHALLOW_COPY):
osg::StateAttribute(o,op),
_target(o._target),
_imageunit(o._imageunit),
_level(o._level),
_layered(o._layered),
_layer(o._layer),
_access(o._access),
_format(o._format) {}
virtual ~BindImageTexture() {}
META_StateAttribute(osg,BindImageTexture, BINDIMAGETEXTURE)
inline void setImageUnit(GLuint i) { _imageunit=i; }
inline GLuint getImageUnit() const { return _imageunit; }
inline void setLevel(GLint i) { _level=i; }
inline GLint getLevel() const { return _level; }
inline void setIsLayered(GLboolean i) { _layered=i; }
inline GLboolean getIsLayered() const { return _layered; }
inline void setLayer(GLint i) { _layer=i; }
inline GLint getLayer() const { return _layer; }
inline void setAccess(Access i) { _access=i; }
inline Access getAccess() const { return _access; }
inline void setFormat(GLenum i) { _format=i; }
inline GLenum getFormat() const { return _format; }
inline void setTexture(osg::Texture* target) { _target=target; }
inline osg::Texture* getTexture() { return _target.get();}
inline const osg::Texture* getTexture() const { return _target.get();}
virtual void apply(osg::State&state) const;
virtual int compare(const osg::StateAttribute &sa) const;
virtual unsigned getMember() const { return static_cast<unsigned int>(_imageunit); }
protected:
osg::ref_ptr<osg::Texture> _target;
GLuint _imageunit;
GLint _level;
GLboolean _layered;
GLint _layer;
Access _access;
GLenum _format;
};
}
#endif
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