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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.
*/
#ifndef OSG_TEXTURE2D
#define OSG_TEXTURE2D 1
#include <osg/Texture>
namespace osg {
/** Encapsulates OpenGL 2D texture functionality. Doesn't support cube maps,
* so ignore \a face parameters.
*/
class OSG_EXPORT Texture2D : public Texture
{
public :
Texture2D();
Texture2D(Image* image);
/** Copy constructor using CopyOp to manage deep vs shallow copy. */
Texture2D(const Texture2D& text,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
META_StateAttribute(osg, Texture2D,TEXTURE);
/** Return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs. */
virtual int compare(const StateAttribute& rhs) const;
virtual GLenum getTextureTarget() const { return GL_TEXTURE_2D; }
/** Sets the texture image. */
void setImage(Image* image);
/** Gets the texture image. */
Image* getImage() { return _image.get(); }
/** Gets the const texture image. */
inline const Image* getImage() const { return _image.get(); }
inline unsigned int& getModifiedCount(unsigned int contextID) const
{
// get the modified count for the current contextID.
return _modifiedCount[contextID];
}
/** Sets the texture image, ignoring face. */
virtual void setImage(unsigned int, Image* image) { setImage(image); }
/** Gets the texture image, ignoring face. */
virtual Image* getImage(unsigned int) { return _image.get(); }
/** Gets the const texture image, ignoring face. */
virtual const Image* getImage(unsigned int) const { return _image.get(); }
/** Gets the number of images that can be assigned to the Texture. */
virtual unsigned int getNumImages() const { return 1; }
/** Sets the texture width and height. If width or height are zero,
* calculate the respective value from the source image size. */
inline void setTextureSize(int width, int height) const
{
_textureWidth = width;
_textureHeight = height;
}
void setTextureWidth(int width) { _textureWidth=width; }
void setTextureHeight(int height) { _textureHeight=height; }
virtual int getTextureWidth() const { return _textureWidth; }
virtual int getTextureHeight() const { return _textureHeight; }
virtual int getTextureDepth() const { return 1; }
class OSG_EXPORT SubloadCallback : public Referenced
{
public:
virtual bool textureObjectValid(const Texture2D& texture, State& state) const
{
return texture.textureObjectValid(state);
}
virtual TextureObject* generateTextureObject(const Texture2D& texture, State& state) const
{
return osg::Texture::generateTextureObject(&texture, state.getContextID(), GL_TEXTURE_2D);
}
virtual void load(const Texture2D& texture,State& state) const = 0;
virtual void subload(const Texture2D& texture,State& state) const = 0;
};
void setSubloadCallback(SubloadCallback* cb) { _subloadCallback = cb;; }
SubloadCallback* getSubloadCallback() { return _subloadCallback.get(); }
const SubloadCallback* getSubloadCallback() const { return _subloadCallback.get(); }
/** Helper function. Sets the number of mipmap levels created for this
* texture. Should only be called within an osg::Texture::apply(), or
* during a custom OpenGL texture load. */
void setNumMipmapLevels(unsigned int num) const { _numMipmapLevels=num; }
/** Gets the number of mipmap levels created. */
unsigned int getNumMipmapLevels() const { return _numMipmapLevels; }
/** Copies pixels into a 2D texture image, as per glCopyTexImage2D.
* Creates an OpenGL texture object from the current OpenGL background
* framebuffer contents at position \a x, \a y with width \a width and
* height \a height. \a width and \a height must be a power of two. */
void copyTexImage2D(State& state, int x, int y, int width, int height );
/** Copies a two-dimensional texture subimage, as per
* glCopyTexSubImage2D. Updates a portion of an existing OpenGL
* texture object from the current OpenGL background framebuffer
* contents at position \a x, \a y with width \a width and height
* \a height. Loads framebuffer data into the texture using offsets
* \a xoffset and \a yoffset. \a width and \a height must be powers
* of two. */
void copyTexSubImage2D(State& state, int xoffset, int yoffset, int x, int y, int width, int height );
/** Bind the texture object. If the texture object hasn't already been
* compiled, create the texture mipmap levels. */
virtual void apply(State& state) const;
protected :
virtual ~Texture2D();
virtual void computeInternalFormat() const;
void allocateMipmap(State& state) const;
/** Return true of the TextureObject assigned to the context associate with osg::State object is valid.*/
bool textureObjectValid(State& state) const;
friend class SubloadCallback;
ref_ptr<Image> _image;
/** Subloaded images can have different texture and image sizes. */
mutable GLsizei _textureWidth, _textureHeight;
/** Number of mipmap levels created. */
mutable GLsizei _numMipmapLevels;
ref_ptr<SubloadCallback> _subloadCallback;
typedef buffered_value<unsigned int> ImageModifiedCount;
mutable ImageModifiedCount _modifiedCount;
};
}
#endif