242 lines
11 KiB
C++
242 lines
11 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_TEXTURE3D
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#define OSG_TEXTURE3D 1
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#include <osg/Texture>
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#ifndef GL_MAX_3D_TEXTURE_SIZE
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#define GL_MAX_3D_TEXTURE_SIZE 0x8073
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#endif
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namespace osg {
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/** Encapsulates OpenGl 2D texture functionality. Doesn't support cube maps,
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* so ignore \a face parameters.
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*/
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class OSG_EXPORT Texture3D : public Texture
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{
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public :
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Texture3D();
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Texture3D(Image* image);
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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 GLenum getTextureTarget() const { return GL_TEXTURE_3D; }
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/** Sets the texture image. */
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void setImage(Image* image);
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/** Gets the texture image. */
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Image* getImage() { return _image.get(); }
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/** Gets the const texture image. */
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inline const Image* getImage() const { return _image.get(); }
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inline unsigned int& getModifiedCount(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[contextID];
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}
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/** Sets the texture image, ignoring face. */
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virtual void setImage(unsigned int, Image* image) { setImage(image); }
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/** Gets the texture image, ignoring face. */
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virtual Image* getImage(unsigned int) { return _image.get(); }
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/** Gets the const texture image, ignoring face. */
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virtual const Image* getImage(unsigned int) const { return _image.get(); }
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/** Gets the number of images that can be assigned to the Texture. */
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virtual unsigned int getNumImages() const { return 1; }
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/** Sets the texture width, height, and depth. If width, height, or
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* depth are zero, calculate the respective value from the source
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* image size. */
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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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/** Gets 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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void setTextureWidth(int width) { _textureWidth=width; }
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void setTextureHeight(int height) { _textureHeight=height; }
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void setTextureDepth(int depth) { _textureDepth=depth; }
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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 _textureDepth; }
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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 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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/** Helper function. Sets the number of mipmap levels created for this
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* texture. Should only be called within an osg::Texture::apply(), or
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* during a custom OpenGL texture load. */
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void setNumMipmapLevels(unsigned int num) const { _numMipmapLevels=num; }
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/** Gets the number of mipmap levels created. */
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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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* glCopyTexSubImage3D. 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, \a yoffset, and \a zoffset. \a width and \a height
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* must be powers of two. */
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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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/** Bind the texture object. If the texture object hasn't already been
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* compiled, create the texture mipmap levels. */
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virtual void apply(State& state) const;
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/** Encapsulates queries of extension availability, obtains extension
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* function pointers, and provides convenience wrappers for
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* calling extension functions. */
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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 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 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 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 glCopyTexSubImage3D( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height ) const;
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bool isCompressedTexImage3DSupported() const { return _glCompressedTexImage3D!=0; }
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void glCompressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLsizei imageSize, const GLvoid *data) const;
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bool isCompressedTexSubImage3DSupported() const { return _glCompressedTexSubImage3D!=0; }
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void glCompressedTexSubImage3D( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLsizei imageSize, const GLvoid *data ) const;
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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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typedef void (APIENTRY * GLTexImage3DProc) ( GLenum target, GLint level, GLenum internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid *pixels);
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typedef void (APIENTRY * GLTexSubImage3DProc) ( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const GLvoid *pixels);
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typedef void (APIENTRY * CompressedTexImage3DArbProc) (GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLsizei imageSize, const GLvoid *data);
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typedef void (APIENTRY * CompressedTexSubImage3DArbProc) (GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLsizei imageSize, const GLvoid *data);
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typedef void (APIENTRY * GLCopyTexSubImageProc) ( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height );
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typedef void (APIENTRY * GLUBuild3DMipMapsProc) ( GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const GLvoid *data);
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GLTexImage3DProc _glTexImage3D;
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GLTexSubImage3DProc _glTexSubImage3D;
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CompressedTexImage3DArbProc _glCompressedTexImage3D;
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CompressedTexSubImage3DArbProc _glCompressedTexSubImage3D;
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GLCopyTexSubImageProc _glCopyTexSubImage3D;
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GLUBuild3DMipMapsProc _gluBuild3DMipmaps;
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};
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/** Encapsulates queries of extension availability, obtains extension
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* function pointers, and provides convenience wrappers for
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* calling extension functions. */
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static Extensions* getExtensions(unsigned int contextID,bool createIfNotInitalized);
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/** Overrides Extensions objects across graphics contexts. Typically
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* used to ensure the same lowest common denominator of extensions
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* on systems with different graphics pipes. */
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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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void computeRequiredTextureDimensions(State& state, const osg::Image& image,GLsizei& width, GLsizei& height,GLsizei& depth, GLsizei& numMipmapLevels) const;
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virtual void computeInternalFormat() const;
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void allocateMipmap(State& state) const;
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void applyTexImage3D(GLenum target, Image* image, State& state, GLsizei& inwidth, GLsizei& inheight, GLsizei& indepth, GLsizei& numMipmapLevels) const;
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/** It's not ideal that _image is mutable, but it's required since
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* Image::ensureDimensionsArePowerOfTwo() can only be called in a
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* valid OpenGL context, and therefore within Texture::apply, which
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* 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 _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;
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};
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}
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#endif
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