150 lines
5.4 KiB
C++
150 lines
5.4 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSG_TEXTURE2D
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#define OSG_TEXTURE2D 1
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#include <osg/Texture>
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namespace osg {
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/** Texture state class which encapsulates OpenGl texture functionality.*/
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class SG_EXPORT Texture2D : public Texture
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{
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public :
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Texture2D();
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Texture2D(Image* image);
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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Texture2D(const Texture2D& text,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
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META_StateAttribute(osg, Texture2D,TEXTURE);
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/** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
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virtual int compare(const StateAttribute& rhs) const;
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virtual bool getModeUsage(ModeUsage& usage) const
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{
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usage.usesTextureMode(GL_TEXTURE_2D);
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return true;
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}
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/** Set the texture image. */
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void setImage(Image* image);
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/** Get the texture image. */
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Image* getImage() { return _image.get(); }
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/** Get the const texture image. */
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inline const Image* getImage() const { return _image.get(); }
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inline unsigned int& getModifiedTag(unsigned int contextID) const
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{
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// get the modified tag for the current contextID.
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return _modifiedTag[contextID];
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}
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/** Set the texture width and height. If width or height are zero then
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* the repsective size value is calculated from the source image sizes. */
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inline void setTextureSize(int width, int height) const
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{
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_textureWidth = width;
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_textureHeight = height;
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}
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int getTextureWidth() const { return _textureWidth; }
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int getTextureHeight() const { return _textureHeight; }
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// deprecated.
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inline void getTextureSize(int& width, int& height) const
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{
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width = _textureWidth;
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height = _textureHeight;
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}
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class SG_EXPORT SubloadCallback : public Referenced
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{
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public:
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virtual void load(const Texture2D& texture,State& state) const = 0;
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virtual void subload(const Texture2D& texture,State& state) const = 0;
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};
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void setSubloadCallback(SubloadCallback* cb) { _subloadCallback = cb;; }
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SubloadCallback* getSubloadCallback() { return _subloadCallback.get(); }
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const SubloadCallback* getSubloadCallback() const { return _subloadCallback.get(); }
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/** Set the number of mip map levels the the texture has been created with,
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should only be called within an osg::Texuture::apply() and custom OpenGL texture load.*/
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void setNumMipmapLevels(unsigned int num) const { _numMipmapLevels=num; }
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/** Get the number of mip map levels the the texture has been created with.*/
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unsigned int getNumMipmapLevels() const { return _numMipmapLevels; }
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/** Copy pixels into a 2D texture image.As per glCopyTexImage2D.
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* Creates an OpenGL texture object from the current OpenGL background
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* framebuffer contents at pos \a x, \a y with width \a width and
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* height \a height. \a width and \a height must be a power of two.
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*/
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void copyTexImage2D(State& state, int x, int y, int width, int height );
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/** Copy a two-dimensional texture subimage. As per glCopyTexSubImage2D.
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* Updates portion of an existing OpenGL texture object from the current OpenGL background
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* framebuffer contents at pos \a x, \a y with width \a width and
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* height \a height. \a width and \a height must be a power of two,
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* and writing into the texture with offset \a xoffset and \a yoffset.
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*/
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void copyTexSubImage2D(State& state, int xoffset, int yoffset, int x, int y, int width, int height );
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/** On first apply (unless already compiled), create the minmapped
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* texture and bind it, subsequent apply will simple bind to texture.*/
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virtual void apply(State& state) const;
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protected :
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virtual ~Texture2D();
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virtual void computeInternalFormat() const;
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// not ideal that _image is mutable, but its required since
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// Image::ensureDimensionsArePowerOfTwo() can only be called
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// in a valid OpenGL context, a therefore within an Texture::apply
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// which is const...
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ref_ptr<Image> _image;
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// subloaded images can have different texture and image sizes.
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mutable GLsizei _textureWidth, _textureHeight;
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// number of mip map levels the the texture has been created with,
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mutable GLsizei _numMipmapLevels;
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ref_ptr<SubloadCallback> _subloadCallback;
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typedef buffered_value<unsigned int> ImageModifiedTag;
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mutable ImageModifiedTag _modifiedTag;
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};
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}
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#endif
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