201 lines
7.7 KiB
C++
201 lines
7.7 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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_TEXTURECUBEMAP
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#define OSG_TEXTURECUBEMAP 1
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#include <osg/Texture>
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#ifndef GL_TEXTURE_CUBE_MAP
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#define GL_TEXTURE_CUBE_MAP 0x8513
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#define GL_TEXTURE_BINDING_CUBE_MAP 0x8514
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#define GL_TEXTURE_CUBE_MAP_POSITIVE_X 0x8515
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#define GL_TEXTURE_CUBE_MAP_NEGATIVE_X 0x8516
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#define GL_TEXTURE_CUBE_MAP_POSITIVE_Y 0x8517
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#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Y 0x8518
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#define GL_TEXTURE_CUBE_MAP_POSITIVE_Z 0x8519
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#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Z 0x851A
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#define GL_PROXY_TEXTURE_CUBE_MAP 0x851B
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#define GL_MAX_CUBE_MAP_TEXTURE_SIZE 0x851C
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#endif
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namespace osg {
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/** TextureCubeMap state class which encapsulates OpenGL texture cubemap functionality. */
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class OSG_EXPORT TextureCubeMap : public Texture
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{
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public :
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TextureCubeMap();
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/** Copy constructor using CopyOp to manage deep vs shallow copy. */
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TextureCubeMap(const TextureCubeMap& cm,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
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META_StateAttribute(osg, TextureCubeMap,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 GLenum getTextureTarget() const { return GL_TEXTURE_CUBE_MAP; }
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enum Face {
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POSITIVE_X=0,
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NEGATIVE_X=1,
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POSITIVE_Y=2,
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NEGATIVE_Y=3,
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POSITIVE_Z=4,
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NEGATIVE_Z=5
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};
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/** Set the texture image for specified face. */
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virtual void setImage(unsigned int face, Image* image);
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/** Get the texture image for specified face. */
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virtual Image* getImage(unsigned int face);
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/** Get the const texture image for specified face. */
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virtual const Image* getImage(unsigned int face) const;
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/** Get the number of images that can be assigned to the Texture. */
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virtual unsigned int getNumImages() const { return 6; }
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inline unsigned int& getModifiedCount(unsigned int face,unsigned int contextID) const
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{
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// get the modified count for the current contextID.
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return _modifiedCount[face][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 respective size value is calculated from the source image sizes.
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*/
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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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void setTextureWidth(int width) { _textureWidth=width; }
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void setTextureHeight(int height) { _textureHeight=height; }
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virtual int getTextureWidth() const { return _textureWidth; }
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virtual int getTextureHeight() const { return _textureHeight; }
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virtual int getTextureDepth() const { return 1; }
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class OSG_EXPORT SubloadCallback : public Referenced
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{
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public:
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virtual void load(const TextureCubeMap& texture,State& state) const = 0;
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virtual void subload(const TextureCubeMap& 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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*/
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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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/** Copies a two-dimensional texture subimage, as per
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* glCopyTexSubImage2D. Updates a portion of an existing OpenGL
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* texture object from the current OpenGL background framebuffer
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* contents at position \a x, \a y with width \a width and height
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* \a height. Loads framebuffer data into the texture using offsets
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* \a xoffset and \a yoffset. \a width and \a height must be powers
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* of two. */
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void copyTexSubImageCubeMap(State& state, int face, int xoffset, int yoffset, int x, int y, int width, int height );
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/** On first apply (unless already compiled), create the mipmapped
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* texture and bind it. Subsequent apply will simple bind to texture.
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*/
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virtual void apply(State& state) const;
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/** Extensions class which encapsulates the querying of extensions and
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* associated function pointers, and provides convenience wrappers to
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* check for the extensions or use the associated functions.
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*/
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class OSG_EXPORT Extensions : public osg::Referenced
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{
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public:
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Extensions(unsigned int contextID);
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Extensions(const Extensions& rhs);
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void lowestCommonDenominator(const Extensions& rhs);
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void setupGLExtensions(unsigned int contextID);
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void setCubeMapSupported(bool flag) { _isCubeMapSupported=flag; }
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bool isCubeMapSupported() const { return _isCubeMapSupported; }
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protected:
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~Extensions() {}
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bool _isCubeMapSupported;
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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 Extensions object for that context has not yet been created
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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 will
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* only be created with the graphics context associated with ContextID.
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*/
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static Extensions* getExtensions(unsigned int contextID,bool createIfNotInitalized);
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/** The setExtensions method 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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*/
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static void setExtensions(unsigned int contextID,Extensions* extensions);
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protected :
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virtual ~TextureCubeMap();
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bool imagesValid() const;
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virtual void computeInternalFormat() const;
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void allocateMipmap(State& state) const;
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ref_ptr<Image> _images[6];
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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> ImageModifiedCount;
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mutable ImageModifiedCount _modifiedCount[6];
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};
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}
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#endif
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