From Art Tevs,
"A new texture class Texture2DArray derived from Texture extends the osg to support the new EXT_texture_array extensions. Texture arrays provides a feature for people interesting in GPGPU programming. Faetures and changes: - Full support for layered 2D textures. - New uniform types were added (sampler2DArray) - FrameBufferObject implementation were changed to support attaching of 2D array textures to the framebuffer - StateSet was slightly changed to support texture arrays. NOTE: array textures can not be used in fixed function pipeline. Thus using the layered texture as a statemode for a Drawable produce invalid enumerant OpenGL errors. - Image class was extended to support handling of array textures Tests: I have used this class as a new feature of my application. It works for me without problems (Note: Texture arrays were introduced only for shading languages and not for fixed function pipelines!!!). RTT with Texture2DArray works, as I have tested them as texture targets for a camera with 6 layers/faces (i.e. replacement for cube maps). I am using the array textures in shader programming. Array textures can be attached to the FBO and used as input and as output."
This commit is contained in:
Robert Osfield
574
src/osg/Texture2DArray.cpp
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574
src/osg/Texture2DArray.cpp
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@@ -0,0 +1,574 @@
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/* -*-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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#include <osg/GLExtensions>
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#include <osg/Texture2DArray>
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#include <osg/State>
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#include <osg/Notify>
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#include <string.h>
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using namespace osg;
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Texture2DArray::Texture2DArray():
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_textureWidth(0),
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_textureHeight(0),
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_textureDepth(0),
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_numMipmapLevels(0)
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{
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}
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Texture2DArray::Texture2DArray(const Texture2DArray& text,const CopyOp& copyop):
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Texture(text,copyop),
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_textureWidth(text._textureWidth),
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_textureHeight(text._textureHeight),
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_textureDepth(text._textureDepth),
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_numMipmapLevels(text._numMipmapLevels),
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_subloadCallback(text._subloadCallback)
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{
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// copy all images by iterating through all of them
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for (int i=0; i < text._textureDepth; i++)
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{
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_images.push_back(copyop(text._images[i].get()));
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_modifiedCount.push_back(ImageModifiedCount());
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}
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}
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Texture2DArray::~Texture2DArray()
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{
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}
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int Texture2DArray::compare(const StateAttribute& sa) const
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{
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// check the types are equal and then create the rhs variable
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// used by the COMPARE_StateAttribute_Paramter macro's below.
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COMPARE_StateAttribute_Types(Texture2DArray,sa)
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bool noImages = true;
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for (int n=0; n < _textureDepth; n++)
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{
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if (noImages && _images[n].valid()) noImages = false;
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if (noImages && rhs._images[n].valid()) noImages = false;
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if (_images[n]!=rhs._images[n]) // smart pointer comparison.
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{
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if (_images[n].valid())
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{
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if (rhs._images[n].valid())
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{
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int result = _images[n]->compare(*rhs._images[n]);
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if (result!=0) return result;
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}
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else
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{
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return 1; // valid lhs._image is greater than null.
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}
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}
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else if (rhs._images[n].valid())
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{
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return -1; // valid rhs._image is greater than null.
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}
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}
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}
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if (noImages)
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{
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int result = compareTextureObjects(rhs);
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if (result!=0) return result;
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}
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int result = compareTexture(rhs);
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if (result!=0) return result;
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// compare each paramter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_textureWidth)
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COMPARE_StateAttribute_Parameter(_textureHeight)
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COMPARE_StateAttribute_Parameter(_textureDepth)
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COMPARE_StateAttribute_Parameter(_subloadCallback)
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return 0; // passed all the above comparison macro's, must be equal.
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}
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void Texture2DArray::setImage(unsigned int layer, Image* image)
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{
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// check if the layer exceeds the texture depth
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if (layer >= _textureDepth)
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{
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// print warning and do nothing
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notify(WARN)<<"Warning: Texture2DArray::setImage(..) failed, the given layer number is bigger then the size of the texture array."<<std::endl;
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return;
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}
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// set image
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_images[layer] = image;
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_modifiedCount[layer].setAllElementsTo(0);
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}
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void Texture2DArray::setTextureSize(int width, int height, int depth)
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{
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// set dimensions
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_textureWidth = width;
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_textureHeight = height;
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setTextureDepth(depth);
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}
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void Texture2DArray::setTextureDepth(int depth)
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{
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// if we decrease the number of layers, then delete non-used
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if (depth < _textureDepth)
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{
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_images.resize(depth);
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_modifiedCount.resize(depth);
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}
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// if we increase the array, then add new empty elements
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if (depth > _textureDepth)
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{
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_images.resize(depth, ref_ptr<Image>(0));
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_modifiedCount.resize(depth, ImageModifiedCount());
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}
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// resize the texture array
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_textureDepth = depth;
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}
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Image* Texture2DArray::getImage(unsigned int layer)
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{
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return _images[layer].get();
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}
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const Image* Texture2DArray::getImage(unsigned int layer) const
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{
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return _images[layer].get();
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}
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bool Texture2DArray::imagesValid() const
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{
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if (_textureDepth < 1) return false;
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for (int n=0; n < _textureDepth; n++)
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{
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if (!_images[n].valid() || !_images[n]->data())
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return false;
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}
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return true;
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}
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void Texture2DArray::computeInternalFormat() const
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{
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if (imagesValid()) computeInternalFormatWithImage(*_images[0]);
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}
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void Texture2DArray::apply(State& state) const
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{
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// get the contextID (user defined ID of 0 upwards) for the
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// current OpenGL context.
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const unsigned int contextID = state.getContextID();
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const Extensions* extensions = getExtensions(contextID,true);
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// if not supported, then return
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if (!extensions->isTexture2DArraySupported() || !extensions->isTexture3DSupported())
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{
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notify(WARN)<<"Warning: Texture2DArray::apply(..) failed, 2D texture arrays are not support by OpenGL driver."<<std::endl;
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return;
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}
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// get the texture object for the current contextID.
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TextureObject* textureObject = getTextureObject(contextID);
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// if we already have an texture object, then
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if (textureObject != 0)
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{
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// bind texture object
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textureObject->bind();
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// if texture parameters changed, then reset them
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if (getTextureParameterDirty(state.getContextID())) applyTexParameters(GL_TEXTURE_2D_ARRAY_EXT,state);
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// if subload is specified, then use it to subload the images to GPU memory
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if (_subloadCallback.valid())
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{
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_subloadCallback->subload(*this,state);
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}
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else
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{
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// for each image of the texture array do
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for (int n=0; n < _textureDepth; n++)
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{
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osg::Image* image = _images[n].get();
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// if image content is modified, then upload it to the GPU memory
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if (image && getModifiedCount(n,contextID) != image->getModifiedCount())
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{
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applyTexImage2DArray_subload(state, image, _textureWidth, _textureHeight, n, _numMipmapLevels);
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getModifiedCount(n,contextID) = image->getModifiedCount();
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}
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}
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}
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}
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// there is no texture object, but exists a subload callback, so use it to upload images
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else if (_subloadCallback.valid())
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{
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// generate texture (i.e. glGenTexture) and apply parameters
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_textureObjectBuffer[contextID] = textureObject = generateTextureObject(contextID, GL_TEXTURE_2D_ARRAY_EXT);
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textureObject->bind();
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applyTexParameters(GL_TEXTURE_2D_ARRAY_EXT, state);
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_subloadCallback->load(*this,state);
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}
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// nothing before, but we have valid images, so do manual upload and create texture object manually
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else if (imagesValid())
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{
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// compute the internal texture format, this set the _internalFormat to an appropriate value.
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computeInternalFormat();
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// compute the dimensions of the texture.
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computeRequiredTextureDimensions(state,*_images[0],_textureWidth, _textureHeight, _numMipmapLevels);
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// create texture object
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_textureObjectBuffer[contextID] = textureObject = generateTextureObject(
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contextID,GL_TEXTURE_2D_ARRAY_EXT,_numMipmapLevels,_internalFormat,_textureWidth,_textureHeight,_textureDepth,0);
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// bind texture
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textureObject->bind();
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applyTexParameters(GL_TEXTURE_2D_ARRAY_EXT, state);
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// now for each layer do
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for (int n=0; n<_textureDepth; n++)
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{
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// if image is valid then upload it to the texture memory
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osg::Image* image = _images[n].get();
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if (image)
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{
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applyTexImage2DArray_subload(state, image, _textureWidth, _textureHeight, n, _numMipmapLevels);
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getModifiedCount(n,contextID) = image->getModifiedCount();
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}
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}
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textureObject->setAllocated(_numMipmapLevels,_internalFormat,_textureWidth,_textureHeight,_textureDepth,0);
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// no idea what this for ;-)
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if (_unrefImageDataAfterApply && areAllTextureObjectsLoaded())
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{
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Texture2DArray* non_const_this = const_cast<Texture2DArray*>(this);
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for (int n=0; n<_textureDepth; n++)
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{
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if (_images[n].valid() && _images[n]->getDataVariance()==STATIC)
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{
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non_const_this->_images[n] = 0;
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}
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}
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}
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}
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// No images present, but dimensions are set. So create empty texture
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else if ( (_textureWidth > 0) && (_textureHeight > 0) && (_textureDepth > 0) && (_internalFormat!=0) )
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{
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// generate texture
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_textureObjectBuffer[contextID] = textureObject = generateTextureObject(
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contextID, GL_TEXTURE_2D_ARRAY_EXT,_numMipmapLevels,_internalFormat,_textureWidth,_textureHeight,_textureDepth,0);
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textureObject->bind();
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applyTexParameters(GL_TEXTURE_2D_ARRAY_EXT,state);
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extensions->glTexImage3D( GL_TEXTURE_2D_ARRAY_EXT, 0, _internalFormat,
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_textureWidth, _textureHeight, _textureDepth,
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_borderWidth,
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_sourceFormat ? _sourceFormat : _internalFormat,
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_sourceType ? _sourceType : GL_UNSIGNED_BYTE,
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0);
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}
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// nothing before, so just unbind the texture target
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else
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{
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glBindTexture( GL_TEXTURE_2D_ARRAY_EXT, 0 );
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}
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}
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void Texture2DArray::applyTexImage2DArray_subload(State& state, Image* image, GLsizei& inwidth, GLsizei& inheight, GLsizei& indepth, GLsizei& numMipmapLevels) const
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{
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// if we don't have a valid image we can't create a texture!
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if (!imagesValid())
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return;
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// get the contextID (user defined ID of 0 upwards) for the
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// current OpenGL context.
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const unsigned int contextID = state.getContextID();
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const Extensions* extensions = getExtensions(contextID,true);
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const Texture::Extensions* texExtensions = Texture::getExtensions(contextID,true);
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GLenum target = GL_TEXTURE_2D_ARRAY_EXT;
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// compute the internal texture format, this set the _internalFormat to an appropriate value.
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computeInternalFormat();
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// select the internalFormat required for the texture.
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bool compressed = isCompressedInternalFormat(_internalFormat);
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bool compressed_image = isCompressedInternalFormat((GLenum)image->getPixelFormat());
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// if the required layer is exceeds the maximum allowed layer sizes
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if (indepth > extensions->maxLayerCount())
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{
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// we give a warning and do nothing
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notify(WARN)<<"Warning: Texture2DArray::applyTexImage2DArray_subload(..) the given layer number exceeds the maximum number of supported layers."<<std::endl;
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return;
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}
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//Rescale if resize hint is set or NPOT not supported or dimensions exceed max size
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if( _resizeNonPowerOfTwoHint || !texExtensions->isNonPowerOfTwoTextureSupported(_min_filter)
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|| inwidth > extensions->max2DSize()
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|| inheight > extensions->max2DSize())
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image->ensureValidSizeForTexturing(extensions->max2DSize());
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glPixelStorei(GL_UNPACK_ALIGNMENT,image->getPacking());
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// if no special mipmapping is required, then
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if( _min_filter == LINEAR || _min_filter == NEAREST )
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{
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numMipmapLevels = 1;
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// upload non-compressed image
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if (!compressed_image)
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{
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extensions->glTexImage3D( target, 0, _internalFormat,
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inwidth, inheight, indepth,
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_borderWidth,
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(GLenum)image->getPixelFormat(),
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(GLenum)image->getDataType(),
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image->data() );
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}
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// if we support compression and image is compressed, then
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else if (extensions->isCompressedTexImage3DSupported())
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{
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// notify(WARN)<<"glCompressedTexImage3D "<<inwidth<<", "<<inheight<<", "<<indepth<<std::endl;
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numMipmapLevels = 1;
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GLint blockSize, size;
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getCompressedSize(_internalFormat, inwidth, inheight, indepth, blockSize,size);
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extensions->glCompressedTexImage3D(target, 0, _internalFormat,
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inwidth, inheight, indepth,
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_borderWidth,
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size,
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image->data());
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}
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// we want to use mipmapping, so enable it
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}else
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{
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// image does not provide mipmaps, so we have to create them
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if(!image->isMipmap())
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{
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notify(WARN)<<"Warning: Texture2DArray::applyTexImage2DArray_subload(..) automagic mipmap generation is currently not implemented."<<std::endl;
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// the image object does provide mipmaps, so upload the in the certain levels of a layer
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}else
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{
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numMipmapLevels = image->getNumMipmapLevels();
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int width = image->s();
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int height = image->t();
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int depth = image->r();
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for( GLsizei k = 0 ; k < numMipmapLevels && (width || height || depth) ;k++)
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{
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if (width == 0)
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width = 1;
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if (height == 0)
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height = 1;
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if (depth == 0)
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depth = 1;
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extensions->glTexImage3D( target, k, _internalFormat,
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width, height, depth, _borderWidth,
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(GLenum)image->getPixelFormat(),
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(GLenum)image->getDataType(),
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image->getMipmapData(k));
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width >>= 1;
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height >>= 1;
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depth >>= 1;
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}
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}
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}
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// set new sizes back
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inwidth = image->s();
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inheight = image->t();
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}
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void Texture2DArray::copyTexSubImage2DArray(State& state, int xoffset, int yoffset, int zoffset, int x, int y, int width, int height )
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{
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const unsigned int contextID = state.getContextID();
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const Extensions* extensions = getExtensions(contextID,true);
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// get the texture object for the current contextID.
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TextureObject* textureObject = getTextureObject(contextID);
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// if texture object is valid
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if (textureObject != 0)
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{
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textureObject->bind();
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applyTexParameters(GL_TEXTURE_2D_ARRAY_EXT,state);
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extensions->glCopyTexSubImage3D( GL_TEXTURE_2D_ARRAY_EXT, 0, xoffset,yoffset,zoffset, x, y, width, height);
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// inform state that this texture is the current one bound.
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state.haveAppliedTextureAttribute(state.getActiveTextureUnit(), this);
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}
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else
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{
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notify(WARN)<<"Warning: Texture2DArray::copyTexSubImage2DArray(..) failed, cannot not copy to a non existant texture."<<std::endl;
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}
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}
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typedef buffered_value< ref_ptr<Texture2DArray::Extensions> > BufferedExtensions;
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static BufferedExtensions s_extensions;
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Texture2DArray::Extensions* Texture2DArray::getExtensions(unsigned int contextID,bool createIfNotInitalized)
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{
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if (!s_extensions[contextID] && createIfNotInitalized) s_extensions[contextID] = new Extensions(contextID);
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return s_extensions[contextID].get();
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}
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void Texture2DArray::setExtensions(unsigned int contextID,Extensions* extensions)
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{
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s_extensions[contextID] = extensions;
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}
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||||
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Texture2DArray::Extensions::Extensions(unsigned int contextID)
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{
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setupGLExtensions(contextID);
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}
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Texture2DArray::Extensions::Extensions(const Extensions& rhs):
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Referenced()
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{
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_isTexture3DSupported = rhs._isTexture3DSupported;
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_isTexture2DArraySupported = rhs._isTexture2DArraySupported;
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||||
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_max2DSize = rhs._max2DSize;
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||||
_maxLayerCount = rhs._maxLayerCount;
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||||
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_glTexImage3D = rhs._glTexImage3D;
|
||||
_glTexSubImage3D = rhs._glTexSubImage3D;
|
||||
_glCopyTexSubImage3D = rhs._glCopyTexSubImage3D;
|
||||
_glCompressedTexImage3D = rhs._glCompressedTexImage3D;
|
||||
_glCompressedTexSubImage3D = rhs._glCompressedTexSubImage3D;;
|
||||
}
|
||||
|
||||
void Texture2DArray::Extensions::lowestCommonDenominator(const Extensions& rhs)
|
||||
{
|
||||
if (!rhs._isTexture3DSupported) _isTexture3DSupported = false;
|
||||
if (!rhs._isTexture2DArraySupported) _isTexture2DArraySupported = false;
|
||||
if (rhs._max2DSize<_max2DSize) _max2DSize = rhs._max2DSize;
|
||||
if (rhs._maxLayerCount<_maxLayerCount) _maxLayerCount = rhs._maxLayerCount;
|
||||
|
||||
if (!rhs._glTexImage3D) _glTexImage3D = 0;
|
||||
if (!rhs._glTexSubImage3D) _glTexSubImage3D = 0;
|
||||
if (!rhs._glCompressedTexImage3D) _glTexImage3D = 0;
|
||||
if (!rhs._glCompressedTexSubImage3D) _glTexSubImage3D = 0;
|
||||
if (!rhs._glCopyTexSubImage3D) _glCopyTexSubImage3D = 0;
|
||||
}
|
||||
|
||||
void Texture2DArray::Extensions::setupGLExtensions(unsigned int contextID)
|
||||
{
|
||||
_isTexture3DSupported = isGLExtensionSupported(contextID,"GL_EXT_texture3D");
|
||||
_isTexture2DArraySupported = isGLExtensionSupported(contextID,"GL_EXT_texture_array");
|
||||
|
||||
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &_max2DSize);
|
||||
glGetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS_EXT, &_maxLayerCount);
|
||||
|
||||
_glTexImage3D = getGLExtensionFuncPtr("glTexImage3D","glTexImage3DEXT");
|
||||
_glTexSubImage3D = getGLExtensionFuncPtr("glTexSubImage3D","glTexSubImage3DEXT");
|
||||
_glCompressedTexImage3D = getGLExtensionFuncPtr("glCompressedTexImage3D","glCompressedTexImage3DARB");
|
||||
_glCompressedTexSubImage3D = getGLExtensionFuncPtr("glCompressedTexSubImage3D","glCompressedTexSubImage3DARB");
|
||||
_glCopyTexSubImage3D = getGLExtensionFuncPtr("glCopyTexSubImage3D","glCopyTexSubImage3DEXT");
|
||||
}
|
||||
|
||||
void Texture2DArray::Extensions::glTexImage3D( GLenum target, GLint level, GLenum internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid *pixels) const
|
||||
{
|
||||
if (_glTexImage3D)
|
||||
{
|
||||
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);
|
||||
((GLTexImage3DProc)_glTexImage3D)( target, level, internalFormat, width, height, depth, border, format, type, pixels);
|
||||
}
|
||||
else
|
||||
{
|
||||
notify(WARN)<<"Error: glTexImage3D not supported by OpenGL driver"<<std::endl;
|
||||
}
|
||||
}
|
||||
|
||||
void Texture2DArray::Extensions::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
|
||||
{
|
||||
if (_glTexSubImage3D)
|
||||
{
|
||||
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);
|
||||
((GLTexSubImage3DProc)_glTexSubImage3D)( target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, pixels);
|
||||
}
|
||||
else
|
||||
{
|
||||
notify(WARN)<<"Error: glTexSubImage3D not supported by OpenGL driver"<<std::endl;
|
||||
}
|
||||
}
|
||||
|
||||
void Texture2DArray::Extensions::glCompressedTexImage3D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLsizei imageSize, const GLvoid *data) const
|
||||
{
|
||||
if (_glCompressedTexImage3D)
|
||||
{
|
||||
typedef void (APIENTRY * CompressedTexImage3DArbProc) (GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLsizei imageSize, const GLvoid *data);
|
||||
((CompressedTexImage3DArbProc)_glCompressedTexImage3D)(target, level, internalformat, width, height, depth, border, imageSize, data);
|
||||
}
|
||||
else
|
||||
{
|
||||
notify(WARN)<<"Error: glCompressedTexImage3D not supported by OpenGL driver"<<std::endl;
|
||||
}
|
||||
}
|
||||
|
||||
void Texture2DArray::Extensions::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
|
||||
{
|
||||
if (_glCompressedTexSubImage3D)
|
||||
{
|
||||
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);
|
||||
((CompressedTexSubImage3DArbProc)_glCompressedTexSubImage3D)(target, level, xoffset, yoffset, zoffset, width, height, depth, format, imageSize, data);
|
||||
}
|
||||
else
|
||||
{
|
||||
notify(WARN)<<"Error: glCompressedTexImage2D not supported by OpenGL driver"<<std::endl;
|
||||
}
|
||||
}
|
||||
|
||||
void Texture2DArray::Extensions::glCopyTexSubImage3D( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height ) const
|
||||
{
|
||||
if (_glCopyTexSubImage3D)
|
||||
{
|
||||
typedef void (APIENTRY * GLCopyTexSubImageProc) ( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height );
|
||||
((GLCopyTexSubImageProc)_glCopyTexSubImage3D)(target, level, xoffset, yoffset, zoffset, x, y, width, height);
|
||||
}
|
||||
else
|
||||
{
|
||||
notify(WARN)<<"Error: glCopyTexSubImage3D not supported by OpenGL driver"<<std::endl;
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user