417 lines
15 KiB
C++
417 lines
15 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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/Texture3D>
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#include <osg/State>
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#include <osg/GLU>
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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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Texture3D::Texture3D():
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_textureWidth(0),
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_textureHeight(0),
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_textureDepth(0),
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_numMimpmapLevels(0)
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{
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}
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Texture3D::Texture3D(const Texture3D& text,const CopyOp& copyop):
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Texture(text,copyop),
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_image(copyop(text._image.get())),
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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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_numMimpmapLevels(text._numMimpmapLevels),
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_subloadCallback(text._subloadCallback)
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{
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}
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Texture3D::~Texture3D()
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{
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}
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int Texture3D::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(Texture3D,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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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 Texture3D::setImage(Image* image)
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{
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// delete old texture objects.
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dirtyTextureObject();
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_modifiedTag.setAllElementsTo(0);
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_image = image;
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}
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void Texture3D::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 (!extensions->isTexture3DSupported())
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{
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notify(WARN)<<"Warning: Texture3D::apply(..) failed, 3D texturing is not support by OpenGL driver."<<std::endl;
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return;
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}
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// get the globj for the current contextID.
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GLuint& handle = getTextureObject(contextID);
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if (handle != 0)
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{
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glBindTexture( GL_TEXTURE_3D, handle );
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if (getTextureParameterDirty(state.getContextID())) applyTexParameters(GL_TEXTURE_3D,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.get() && getModifiedTag(contextID) != _image->getModifiedTag())
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{
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applyTexImage3D(GL_TEXTURE_3D,_image.get(),state, _textureWidth, _textureHeight, _textureDepth,_numMimpmapLevels);
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// update the modified tag to show that it is upto date.
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getModifiedTag(contextID) = _image->getModifiedTag();
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}
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}
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else if (_subloadCallback.valid())
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{
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glGenTextures( 1L, (GLuint *)&handle );
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glBindTexture( GL_TEXTURE_3D, handle );
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applyTexParameters(GL_TEXTURE_3D,state);
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_subloadCallback->load(*this,state);
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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_3D, handle );
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}
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else if (_image.valid() && _image->data())
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{
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glGenTextures( 1L, (GLuint *)&handle );
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glBindTexture( GL_TEXTURE_3D, handle );
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applyTexParameters(GL_TEXTURE_3D,state);
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applyTexImage3D(GL_TEXTURE_3D,_image.get(),state, _textureWidth, _textureHeight, _textureDepth,_numMimpmapLevels);
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// update the modified tag to show that it is upto date.
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getModifiedTag(contextID) = _image->getModifiedTag();
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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_3D, handle );
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}
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else
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{
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glBindTexture( GL_TEXTURE_3D, 0 );
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}
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}
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void Texture3D::computeInternalFormat() const
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{
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if (_image.valid()) computeInternalFormatWithImage(*_image);
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}
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void Texture3D::applyTexImage3D(GLenum target, Image* image, State& state, GLsizei& inwidth, GLsizei& inheight, GLsizei& indepth, GLsizei& numMimpmapLevels) 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 (!image || !image->data())
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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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// 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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if (compressed)
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{
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notify(WARN)<<"Warning::cannot currently use compressed format with 3D textures."<<std::endl;
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return;
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}
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image->ensureValidSizeForTexturing(extensions->maxTexture3DSize());
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glPixelStorei(GL_UNPACK_ALIGNMENT,image->getPacking());
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if( _min_filter == LINEAR || _min_filter == NEAREST )
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{
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numMimpmapLevels = 1;
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extensions->glTexImage3D( target, 0, _internalFormat,
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image->s(), image->t(), image->r(), 0,
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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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else
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{
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if(!image->isMipmap())
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{
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numMimpmapLevels = 1;
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extensions->gluBuild3DMipmaps( target, _internalFormat,
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image->s(),image->t(),image->r(),
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(GLenum)image->getPixelFormat(), (GLenum)image->getDataType(),
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image->data() );
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}
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else
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{
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numMimpmapLevels = 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 < numMimpmapLevels && (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, 0,
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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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inwidth = image->s();
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inheight = image->t();
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indepth = image->r();
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}
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void Texture3D::copyTexSubImage3D(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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// get the globj for the current contextID.
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GLuint& handle = getTextureObject(contextID);
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const Extensions* extensions = getExtensions(contextID,true);
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if (handle)
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{
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// we have a valid image
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glBindTexture( GL_TEXTURE_3D, handle );
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applyTexParameters(GL_TEXTURE_3D,state);
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extensions->glCopyTexSubImage3D( GL_TEXTURE_3D, 0, xoffset,yoffset,zoffset, x, y, width, height);
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/* Redundant, delete later */
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glBindTexture( GL_TEXTURE_3D, handle );
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// inform state that this texture is the current one bound.
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state.haveAppliedAttribute(this);
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}
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else
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{
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notify(WARN)<<"Warning: Texture3D::copyTexSubImage3D(..) 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<Texture3D::Extensions> > BufferedExtensions;
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static BufferedExtensions s_extensions;
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const Texture3D::Extensions* Texture3D::getExtensions(unsigned int contextID,bool createIfNotInitalized)
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{
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if (!s_extensions[contextID] && createIfNotInitalized) s_extensions[contextID] = new Extensions;
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return s_extensions[contextID].get();
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}
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void Texture3D::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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#ifndef GL_MAX_3D_TEXTURE_SIZE
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#define GL_MAX_3D_TEXTURE_SIZE 0x8073
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#endif
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Texture3D::Extensions::Extensions()
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{
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setupGLExtenions();
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}
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Texture3D::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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_isTexture3DFast = rhs._isTexture3DFast;
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_maxTexture3DSize = rhs._maxTexture3DSize;
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_glTexImage3D = rhs._glTexImage3D;
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_glTexSubImage3D = rhs._glTexSubImage3D;
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_glCopyTexSubImage3D = rhs._glCopyTexSubImage3D;
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_gluBuild3DMipmaps = rhs._gluBuild3DMipmaps;
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}
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void Texture3D::Extensions::lowestCommonDenominator(const Extensions& rhs)
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{
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if (!rhs._isTexture3DSupported) _isTexture3DSupported = false;
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if (!rhs._isTexture3DFast) _isTexture3DFast = false;
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if (rhs._maxTexture3DSize<_maxTexture3DSize) _maxTexture3DSize = rhs._maxTexture3DSize;
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if (!rhs._glTexImage3D) _glTexImage3D = 0;
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if (!rhs._glTexSubImage3D) _glTexSubImage3D = 0;
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if (!rhs._glCopyTexSubImage3D) _glCopyTexSubImage3D = 0;
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if (!rhs._gluBuild3DMipmaps) _gluBuild3DMipmaps = 0;
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}
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void Texture3D::Extensions::setupGLExtenions()
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{
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_isTexture3DFast = isGLExtensionSupported("GL_EXT_texture3D");
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if (_isTexture3DFast) _isTexture3DSupported = true;
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else _isTexture3DSupported = strncmp((const char*)glGetString(GL_VERSION),"1.2",3)>=0;
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glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE, &_maxTexture3DSize);
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_glTexImage3D = getGLExtensionFuncPtr("glTexImage3D","glTexImage3DEXT");;
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_glTexSubImage3D = getGLExtensionFuncPtr("glTexSubImage3D","glTexSubImage3DEXT");
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_glCopyTexSubImage3D = getGLExtensionFuncPtr("glCopyTexSubImage3D","glCopyTexSubImage3DEXT");
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_gluBuild3DMipmaps = getGLExtensionFuncPtr("gluBuild3DMipmaps");
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}
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void Texture3D::Extensions::glTexImage3D( GLenum target, GLint level, GLenum internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid *pixels) const
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{
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// ::glTexImage3D( target, level, internalFormat, width, height, depth, border, format, type, pixels);
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if (_glTexImage3D)
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{
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typedef void (APIENTRY * GLTexImage3DProc) ( GLenum target, GLint level, GLenum internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const GLvoid *pixels);
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((GLTexImage3DProc)_glTexImage3D)( target, level, internalFormat, width, height, depth, border, format, type, pixels);
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}
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else
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{
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notify(WARN)<<"Error: glTexImage3D not supported by OpenGL driver"<<std::endl;
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}
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}
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void Texture3D::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
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{
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// ::glTexSubImage3D( target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, pixels);
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if (_glTexSubImage3D)
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{
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typedef void (APIENTRY * GLTexSubImage3DProc) ( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const GLvoid *pixels);
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((GLTexSubImage3DProc)_glTexSubImage3D)( target, level, xoffset, yoffset, zoffset, width, height, depth, format, type, pixels);
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}
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else
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{
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notify(WARN)<<"Error: glTexSubImage3D not supported by OpenGL driver"<<std::endl;
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}
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}
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void Texture3D::Extensions::glCopyTexSubImage3D( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height ) const
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{
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// ::glCopyTexSubImage3D(target, level, xoffset, yoffset, zoffset, x, y, width, height);
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if (_glCopyTexSubImage3D)
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{
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typedef void (APIENTRY * GLCopyTexSubImageProc) ( GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLint x, GLint y, GLsizei width, GLsizei height );
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((GLCopyTexSubImageProc)_glCopyTexSubImage3D)(target, level, xoffset, yoffset, zoffset, x, y, width, height);
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}
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else
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{
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notify(WARN)<<"Error: glCopyTexSubImage3D not supported by OpenGL driver"<<std::endl;
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}
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}
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void Texture3D::Extensions::gluBuild3DMipmaps( GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const GLvoid *data) const
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{
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// ::gluBuild3DMipmaps(target, internalFormat, width, height, depth, format, type, data);
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if (_gluBuild3DMipmaps)
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{
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typedef void (APIENTRY * GLUBuild3DMipMapsProc) ( GLenum target, GLint internalFormat, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const GLvoid *data);
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((GLUBuild3DMipMapsProc)_gluBuild3DMipmaps)(target, internalFormat, width, height, depth, format, type, data);
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}
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else
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{
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notify(WARN)<<"Error: gluBuild3DMipmaps not supported by OpenGL driver"<<std::endl;
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}
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}
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