8b03d59be3
Added an example modifying osg::Texture::Extensions to osgtext. Optionally compiled out by default.
202 lines
8.4 KiB
C++
202 lines
8.4 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_TEXTURE3D
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#define OSG_TEXTURE3D 1
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#include <osg/Texture>
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namespace osg {
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/** Texture state class which encapsulates OpenGl 3D texture functionality.*/
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class SG_EXPORT Texture3D : public Texture
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{
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public :
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Texture3D();
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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Texture3D(const Texture3D& text,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
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META_StateAttribute(osg, Texture3D,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 void getAssociatedModes(std::vector<GLMode>& modes) const
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{
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modes.push_back(GL_TEXTURE_3D);
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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, int depth) const
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{
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_textureWidth = width;
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_textureHeight = height;
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_textureDepth = depth;
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}
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/** Get the texture subload width. */
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inline void getTextureSize(int& width, int& height, int& depth) const
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{
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width = _textureWidth;
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height = _textureHeight;
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depth = _textureDepth;
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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 Texture3D& texture,State& state) const = 0;
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virtual void subload(const Texture3D& 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 { _numMimpmapLevels=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 _numMimpmapLevels; }
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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. */
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void copyTexSubImage3D(State& state, int xoffset, int yoffset, int zoffset, 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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/** Extensions class which encapsulates the querring of extensions and
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* associated function pointers, and provide convinience wrappers to
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* check for the extensions or use the associated functions.*/
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class SG_EXPORT Extensions : public osg::Referenced
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{
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public:
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Extensions();
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Extensions(const Extensions& rhs);
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void lowestCommonDenominator(const Extensions& rhs);
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void setupGLExtenions();
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void setTexture3DSupported(bool flag) { _isTexture3DSupported=flag; }
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bool isTexture3DSupported() const { return _isTexture3DSupported; }
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void setTexture3DFast(bool flag) { _isTexture3DFast=flag; }
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bool isTexture3DFast() const { return _isTexture3DFast; }
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void setMaxTexture3DSize(GLint maxsize) { _maxTexture3DSize=maxsize; }
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GLint maxTexture3DSize() const { return _maxTexture3DSize; }
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void setTexImage3DProc(void* ptr) { _glTexImage3D = ptr; }
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void glTexImage3D( GLenum target, GLint level, GLenum internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid *pixels) const;
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void setTexSubImage3DProc(void* ptr) { _glTexSubImage3D = ptr; }
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void glTexSubImage3D( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const GLvoid *pixels) const;
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void setCopyTexSubImage3DProc(void* ptr) { _glCopyTexSubImage3D = ptr; }
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void glCopyTexSubImage3D( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height ) const;
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void setBuild3DMipmapsProc(void* ptr) { _gluBuild3DMipmaps = ptr; }
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void gluBuild3DMipmaps( GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const GLvoid *data) const;
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protected:
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~Extensions() {}
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bool _isTexture3DSupported;
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bool _isTexture3DFast;
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GLint _maxTexture3DSize;
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void* _glTexImage3D;
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void* _glTexSubImage3D;
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void* _glCopyTexSubImage3D;
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void* _gluBuild3DMipmaps;
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};
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/** Function to call to get the extension of a specified context.
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* If the Exentsion object for that context has not yet been created then
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* and the 'createIfNotInitalized' flag been set to false then returns NULL.
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* If 'createIfNotInitalized' is true then the Extensions object is
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* automatically created. However, in this case the extension object
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* only be created with the graphics context associated with ContextID..*/
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static Extensions* getExtensions(unsigned int contextID,bool createIfNotInitalized);
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/** setExtensions allows users to override the extensions across graphics contexts.
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* typically used when you have different extensions supported across graphics pipes
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* but need to ensure that they all use the same low common denominator extensions.*/
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static void setExtensions(unsigned int contextID,Extensions* extensions);
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protected :
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virtual ~Texture3D();
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virtual void computeInternalFormat() const;
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void applyTexImage3D(GLenum target, Image* image, State& state, GLsizei& inwidth, GLsizei& inheight, GLsizei& indepth, GLsizei& numMimpmapLevels) 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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mutable 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, _textureDepth;
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// number of mip map levels the the texture has been created with,
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mutable GLsizei _numMimpmapLevels;
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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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