498 lines
16 KiB
C++
498 lines
16 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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#include <osg/GLExtensions>
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#include <osg/Texture2D>
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#include <osg/State>
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#include <osg/ContextData>
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#include <osg/Notify>
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using namespace osg;
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Texture2D::Texture2D():
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_textureWidth(0),
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_textureHeight(0),
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_numMipmapLevels(0)
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{
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setUseHardwareMipMapGeneration(true);
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}
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Texture2D::Texture2D(Image* image):
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_textureWidth(0),
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_textureHeight(0),
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_numMipmapLevels(0)
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{
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setUseHardwareMipMapGeneration(true);
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setImage(image);
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}
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Texture2D::Texture2D(const Texture2D& 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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_numMipmapLevels(text._numMipmapLevels),
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_subloadCallback(text._subloadCallback)
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{
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setImage(copyop(text._image.get()));
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}
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Texture2D::~Texture2D()
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{
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setImage(NULL);
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}
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int Texture2D::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_Parameter macros below.
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COMPARE_StateAttribute_Types(Texture2D,sa)
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if (_image!=rhs._image) // smart pointer comparison.
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{
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if (_image.valid())
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{
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if (rhs._image.valid())
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{
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int result = _image->compare(*rhs._image);
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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._image.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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if (!_image && !rhs._image)
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{
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// no image attached to either Texture2D
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// but could these textures already be downloaded?
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// check the _textureObjectBuffer to see if they have been
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// downloaded
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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 parameter in turn against the rhs.
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#if 1
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if (_textureWidth != 0 && rhs._textureWidth != 0)
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{
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COMPARE_StateAttribute_Parameter(_textureWidth)
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}
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if (_textureHeight != 0 && rhs._textureHeight != 0)
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{
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COMPARE_StateAttribute_Parameter(_textureHeight)
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}
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#endif
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COMPARE_StateAttribute_Parameter(_subloadCallback)
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return 0; // passed all the above comparison macros, must be equal.
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}
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void Texture2D::setImage(Image* image)
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{
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if (_image == image) return;
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if (_image.valid())
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{
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_image->removeClient(this);
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if (_image->requiresUpdateCall())
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{
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setUpdateCallback(0);
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setDataVariance(osg::Object::STATIC);
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}
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}
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_image = image;
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_modifiedCount.setAllElementsTo(0);
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if (_image.valid())
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{
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_image->addClient(this);
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if (_image->requiresUpdateCall())
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{
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setUpdateCallback(new Image::UpdateCallback());
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setDataVariance(osg::Object::DYNAMIC);
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}
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}
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}
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bool Texture2D::textureObjectValid(State& state) const
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{
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TextureObject* textureObject = getTextureObject(state.getContextID());
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if (!textureObject) return false;
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// return true if image isn't assigned as we won't be override the value.
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if (!_image) return true;
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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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GLsizei new_width, new_height, new_numMipmapLevels;
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// compute the dimensions of the texture.
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computeRequiredTextureDimensions(state, *_image, new_width, new_height, new_numMipmapLevels);
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return textureObject->match(GL_TEXTURE_2D, new_numMipmapLevels, _internalFormat, new_width, new_height, 1, _borderWidth);
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}
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void Texture2D::apply(State& state) const
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{
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//state.setReportGLErrors(true);
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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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// get the texture object for the current contextID.
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TextureObject* textureObject = getTextureObject(contextID);
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if (textureObject)
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{
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bool textureObjectInvalidated = false;
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if (_subloadCallback.valid())
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{
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textureObjectInvalidated = !_subloadCallback->textureObjectValid(*this, state);
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}
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else if (_image.valid() && getModifiedCount(contextID) != _image->getModifiedCount())
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{
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textureObjectInvalidated = !textureObjectValid(state);
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}
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if (textureObjectInvalidated)
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{
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// OSG_NOTICE<<"Discarding TextureObject"<<std::endl;
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_textureObjectBuffer[contextID]->release();
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_textureObjectBuffer[contextID] = 0;
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textureObject = 0;
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}
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}
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if (textureObject)
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{
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textureObject->bind();
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if (getTextureParameterDirty(state.getContextID()))
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applyTexParameters(GL_TEXTURE_2D,state);
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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 if (_image.valid() && getModifiedCount(contextID) != _image->getModifiedCount())
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{
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// update the modified tag to show that it is up to date.
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getModifiedCount(contextID) = _image->getModifiedCount();
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applyTexImage2D_subload(state,GL_TEXTURE_2D,_image.get(),
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_textureWidth, _textureHeight, _internalFormat, _numMipmapLevels);
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}
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else if (_readPBuffer.valid())
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{
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_readPBuffer->bindPBufferToTexture(GL_FRONT);
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}
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}
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else if (_subloadCallback.valid())
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{
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_textureObjectBuffer[contextID] = _subloadCallback->generateTextureObject(*this, state);
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textureObject = _textureObjectBuffer[contextID].get();
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textureObject->bind();
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applyTexParameters(GL_TEXTURE_2D,state);
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if (_image.valid()) getModifiedCount(contextID) = _image->getModifiedCount();
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_subloadCallback->load(*this,state);
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textureObject->setAllocated(_numMipmapLevels,_internalFormat,_textureWidth,_textureHeight,1,_borderWidth);
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// in theory the following line is redundent, but in practice
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// have found that the first frame drawn doesn't apply the textures
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// unless a second bind is called?!!
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// perhaps it is the first glBind which is not required...
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//glBindTexture( GL_TEXTURE_2D, handle );
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// update the modified tag to show that it is up to date.
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}
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else if (_image.valid() && _image->data())
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{
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// keep the image around at least till we go out of scope.
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osg::ref_ptr<osg::Image> image = _image;
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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,*image,_textureWidth, _textureHeight, _numMipmapLevels);
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textureObject = generateAndAssignTextureObject(contextID,GL_TEXTURE_2D,_numMipmapLevels,_internalFormat,_textureWidth,_textureHeight,1,_borderWidth);
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textureObject->bind();
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applyTexParameters(GL_TEXTURE_2D,state);
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// update the modified tag to show that it is up to date.
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getModifiedCount(contextID) = image->getModifiedCount();
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if (textureObject->isAllocated() && image->supportsTextureSubloading())
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{
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//OSG_NOTICE<<"Reusing texture object"<<std::endl;
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applyTexImage2D_subload(state,GL_TEXTURE_2D,image.get(),
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_textureWidth, _textureHeight, _internalFormat, _numMipmapLevels);
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}
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else
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{
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//OSG_NOTICE<<"Creating new texture object"<<std::endl;
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applyTexImage2D_load(state,GL_TEXTURE_2D,image.get(),
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_textureWidth, _textureHeight, _numMipmapLevels);
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textureObject->setAllocated(true);
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}
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// unref image data?
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if (isSafeToUnrefImageData(state) && image->getDataVariance()==STATIC)
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{
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Texture2D* non_const_this = const_cast<Texture2D*>(this);
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non_const_this->_image = NULL;
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}
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// in theory the following line is redundent, but in practice
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// have found that the first frame drawn doesn't apply the textures
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// unless a second bind is called?!!
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// perhaps it is the first glBind which is not required...
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//glBindTexture( GL_TEXTURE_2D, handle );
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}
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else if ( (_textureWidth!=0) && (_textureHeight!=0) && (_internalFormat!=0) )
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{
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textureObject = generateAndAssignTextureObject(contextID,GL_TEXTURE_2D,_numMipmapLevels,_internalFormat,_textureWidth,_textureHeight,1,_borderWidth);
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textureObject->bind();
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applyTexParameters(GL_TEXTURE_2D,state);
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// no image present, but dimensions at set so lets create the texture
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glTexImage2D( GL_TEXTURE_2D, 0, _internalFormat,
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_textureWidth, _textureHeight, _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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if (_readPBuffer.valid())
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{
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_readPBuffer->bindPBufferToTexture(GL_FRONT);
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}
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}
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else
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{
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glBindTexture( GL_TEXTURE_2D, 0 );
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}
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// if texture object is now valid and we have to allocate mipmap levels, then
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if (textureObject != 0 && _texMipmapGenerationDirtyList[contextID])
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{
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generateMipmap(state);
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}
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}
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void Texture2D::computeInternalFormat() const
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{
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if (_image.valid()) computeInternalFormatWithImage(*_image);
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else computeInternalFormatType();
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}
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void Texture2D::copyTexImage2D(State& state, 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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if (_internalFormat==0) _internalFormat=GL_RGBA;
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// get the globj for the current contextID.
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TextureObject* textureObject = getTextureObject(contextID);
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if (textureObject)
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{
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if (width==(int)_textureWidth && height==(int)_textureHeight)
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{
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// we have a valid texture object which is the right size
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// so lets play clever and use copyTexSubImage2D instead.
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// this allows use to reuse the texture object and avoid
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// expensive memory allocations.
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copyTexSubImage2D(state,0 ,0, x, y, width, height);
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return;
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}
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// the relevant texture object is not of the right size so
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// needs to been deleted
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// remove previously bound textures.
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dirtyTextureObject();
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// note, dirtyTextureObject() dirties all the texture objects for
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// this texture, is this right? Perhaps we should dirty just the
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// one for this context. Note sure yet will leave till later.
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// RO July 2001.
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}
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// remove any previously assigned images as these are nolonger valid.
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_image = NULL;
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// switch off mip-mapping.
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//
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bool needHardwareMipMap = (_min_filter != LINEAR && _min_filter != NEAREST);
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bool hardwareMipMapOn = false;
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if (needHardwareMipMap)
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{
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hardwareMipMapOn = isHardwareMipmapGenerationEnabled(state);
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if (!hardwareMipMapOn)
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{
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// have to switch off mip mapping
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OSG_NOTICE<<"Warning: Texture2D::copyTexImage2D(,,,,) switch off mip mapping as hardware support not available."<<std::endl;
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_min_filter = LINEAR;
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}
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}
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_textureWidth = width;
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_textureHeight = height;
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_numMipmapLevels = 1;
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if (needHardwareMipMap)
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{
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for(int s=1; s<width || s<height; s <<= 1, ++_numMipmapLevels) {}
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}
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textureObject = generateAndAssignTextureObject(contextID,GL_TEXTURE_2D,_numMipmapLevels,_internalFormat,_textureWidth,_textureHeight,1,0);
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textureObject->bind();
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applyTexParameters(GL_TEXTURE_2D,state);
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GenerateMipmapMode mipmapResult = mipmapBeforeTexImage(state, hardwareMipMapOn);
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glCopyTexImage2D( GL_TEXTURE_2D, 0, _internalFormat, x, y, width, height, 0 );
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mipmapAfterTexImage(state, mipmapResult);
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textureObject->setAllocated(true);
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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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void Texture2D::copyTexSubImage2D(State& state, int xoffset, int yoffset, 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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if (_internalFormat==0) _internalFormat=GL_RGBA;
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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 (textureObject)
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{
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// we have a valid image
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textureObject->bind();
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applyTexParameters(GL_TEXTURE_2D,state);
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bool needHardwareMipMap = (_min_filter != LINEAR && _min_filter != NEAREST);
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bool hardwareMipMapOn = false;
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if (needHardwareMipMap)
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{
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hardwareMipMapOn = isHardwareMipmapGenerationEnabled(state);
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if (!hardwareMipMapOn)
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{
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// have to switch off mip mapping
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OSG_NOTICE<<"Warning: Texture2D::copyTexImage2D(,,,,) switch off mip mapping as hardware support not available."<<std::endl;
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_min_filter = LINEAR;
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}
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}
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GenerateMipmapMode mipmapResult = mipmapBeforeTexImage(state, hardwareMipMapOn);
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glCopyTexSubImage2D( GL_TEXTURE_2D, 0, xoffset, yoffset, x, y, width, height);
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mipmapAfterTexImage(state, mipmapResult);
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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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// no texture object already exsits for this context so need to
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// create it upfront - simply call copyTexImage2D.
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copyTexImage2D(state,x,y,width,height);
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}
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}
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void Texture2D::allocateMipmap(State& state) const
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{
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const unsigned int contextID = state.getContextID();
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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 (textureObject && _textureWidth != 0 && _textureHeight != 0)
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{
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// bind texture
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textureObject->bind();
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// compute number of mipmap levels
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int width = _textureWidth;
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int height = _textureHeight;
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int numMipmapLevels = Image::computeNumberOfMipmapLevels(width, height);
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// we do not reallocate the level 0, since it was already allocated
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width >>= 1;
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height >>= 1;
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for( GLsizei k = 1; k < numMipmapLevels && (width || height); 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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glTexImage2D( GL_TEXTURE_2D, k, _internalFormat,
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width, height, _borderWidth,
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_sourceFormat ? _sourceFormat : _internalFormat,
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_sourceType ? _sourceType : GL_UNSIGNED_BYTE, NULL);
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width >>= 1;
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height >>= 1;
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}
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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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}
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