1284a0dd40
TextureBuffer objects may use osg::Texture::bindToImageUnit(), so GLSL shaders are able to use not only texelFetch() function , but also functions defined in GL_ARB_shader_image_load_store extension : imageLoad(), imageStore(), imageAtomicAdd() etc." second email: "After a while I found that osg::Texture::applyTexParameters() used with TextureBuffer may cause some OpenGL errors ( applying texture filters and wraps to TextureBuffer makes no sense ) so I fixed it."
147 lines
4.9 KiB
C++
147 lines
4.9 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2013 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_TEXTUREBUFFEROBJECT
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#define OSG_TEXTUREBUFFEROBJECT 1
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#include <osg/Texture>
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#include <osg/BufferObject>
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#ifndef GL_ARB_texture_buffer_object
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#define GL_TEXTURE_BUFFER_ARB 0x8C2A
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#define GL_MAX_TEXTURE_BUFFER_SIZE_ARB 0x8C2B
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#define GL_TEXTURE_BINDING_BUFFER_ARB 0x8C2C
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#define GL_TEXTURE_BUFFER_DATA_STORE_BINDING_ARB 0x8C2D
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#define GL_TEXTURE_BUFFER_FORMAT_ARB 0x8C2E
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#endif
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namespace osg {
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/** Encapsulates OpenGL texture buffer functionality.
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*/
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class OSG_EXPORT TextureBuffer : public Texture
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{
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public :
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TextureBuffer();
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TextureBuffer(Image* image);
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/** Copy constructor using CopyOp to manage deep vs shallow copy. */
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TextureBuffer(const TextureBuffer& text,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
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META_StateAttribute(osg, TextureBuffer, 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_BUFFER_ARB; }
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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) { _textureWidth = width; }
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/** Gets the texture width. */
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virtual int getTextureWidth() const { return _textureWidth; }
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virtual int getTextureHeight() const { return 1; }
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virtual int getTextureDepth() const { return 1; }
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inline void setUsageHint( GLenum usageHint ) { _usageHint=usageHint; }
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inline GLenum getUsageHint() const { return _usageHint; }
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virtual void allocateMipmap(State& state) const {};
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/** Bind the texture buffer.*/
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virtual void apply(State& state) const;
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/** Bind buffer to different target. */
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void bindBufferAs(unsigned int contextID, GLenum target);
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void unbindBufferAs(unsigned int contextID, GLenum target);
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protected :
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virtual ~TextureBuffer();
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virtual void computeInternalFormat() const;
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ref_ptr<Image> _image;
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mutable GLsizei _textureWidth;
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GLenum _usageHint;
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typedef buffered_value<unsigned int> ImageModifiedCount;
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mutable ImageModifiedCount _modifiedCount;
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class TextureBufferObject : public osg::Referenced
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{
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public:
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TextureBufferObject(unsigned int contextID, GLenum usageHint) :
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_id(0),
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_usageHint(usageHint)
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{
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_extensions = osg::GLBufferObject::getExtensions(contextID, true);
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}
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void bindBuffer(GLenum target);
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void unbindBuffer(GLenum target);
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void texBuffer(GLenum internalFormat);
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void bufferData( osg::Image* image );
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void bufferSubData( osg::Image* image );
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public:
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GLuint _id;
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GLenum _usageHint;
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osg::GLBufferObject::Extensions* _extensions;
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};
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typedef osg::buffered_object<osg::ref_ptr<TextureBufferObject> > TextureBufferObjectList;
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mutable TextureBufferObjectList _textureBufferObjects;
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};
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}
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#endif
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