154 lines
5.5 KiB
C++
154 lines
5.5 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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// -*-c++-*-
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#ifndef OSG_TEXTURE1D
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#define OSG_TEXTURE1D 1
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#include <osg/Texture>
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namespace osg {
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/** Encapsulates OpenGl 1D 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 Texture1D : public Texture
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{
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public :
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Texture1D();
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/** Copy constructor using CopyOp to manage deep vs shallow copy. */
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Texture1D(const Texture1D& text,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
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META_StateAttribute(osg, Texture1D,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_1D; }
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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. If width is zero, calculate the value
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* from the source image width. */
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inline void setTextureWidth(int width) const { _textureWidth = width; }
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/** Gets the texture width. */
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inline int getTextureWidth() const { return _textureWidth; }
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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 Texture1D& texture,State& state) const = 0;
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virtual void subload(const Texture1D& 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::Texuture::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 pixels into a 1D texture image, as per glCopyTexImage1D.
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* Creates an OpenGL texture object from the current OpenGL background
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* framebuffer contents at position \a x, \a y with width \a width.
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* \a width must be a power of two. */
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void copyTexImage1D(State& state, int x, int y, int width);
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/** Copies a one-dimensional texture subimage, as per
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* glCopyTexSubImage1D. 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. */
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void copyTexSubImage1D(State& state, int xoffset, int x, int y, int width);
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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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protected :
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virtual ~Texture1D();
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virtual void computeInternalFormat() const;
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/** Helper method. Createa the texture without setting or using a
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* texture binding. */
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void applyTexImage1D(GLenum target, Image* image, State& state, GLsizei& width, 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;
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/** Number of mipmap levels created. */
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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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