294 lines
9.0 KiB
C++
294 lines
9.0 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/ref_ptr>
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#include <osg/Image>
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#include <osg/State>
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#include <osg/TextureCubeMap>
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#include <osg/GLU>
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using namespace osg;
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// include/osg/TextureCubeMap defines GL_TEXTURE_CUBE_MAP to be
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// 0x8513 which is the same as GL_TEXTURE_CUBE_MAP_ARB & _EXT.
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// assume its the same as what OpenGL 1.3 defines.
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#ifndef GL_ARB_texture_cube_map
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#define GL_ARB_texture_cube_map 1
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#define GL_TEXTURE_CUBE_MAP_ARB 0x8513
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#define GL_TEXTURE_BINDING_CUBE_MAP_ARB 0x8514
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#define GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB 0x8515
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#define GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB 0x8516
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#define GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB 0x8517
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#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB 0x8518
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#define GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB 0x8519
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#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB 0x851A
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#define GL_PROXY_TEXTURE_CUBE_MAP_ARB 0x851B
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#define GL_MAX_CUBE_MAP_TEXTURE_SIZE_ARB 0x851C
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#endif
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#ifndef GL_EXT_texture_cube_map
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#define GL_EXT_texture_cube_map 1
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#define GL_TEXTURE_CUBE_MAP_EXT 0x8513
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#define GL_TEXTURE_BINDING_CUBE_MAP_EXT 0x8514
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#define GL_TEXTURE_CUBE_MAP_POSITIVE_X_EXT 0x8515
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#define GL_TEXTURE_CUBE_MAP_NEGATIVE_X_EXT 0x8516
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#define GL_TEXTURE_CUBE_MAP_POSITIVE_Y_EXT 0x8517
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#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT 0x8518
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#define GL_TEXTURE_CUBE_MAP_POSITIVE_Z_EXT 0x8519
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#define GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT 0x851A
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#define GL_PROXY_TEXTURE_CUBE_MAP_EXT 0x851B
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#define GL_MAX_CUBE_MAP_TEXTURE_SIZE_EXT 0x851C
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#endif
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#ifdef GL_ARB_texture_cube_map
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# define CUBE_MAP_POSITIVE_X GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB
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# define CUBE_MAP_NEGATIVE_X GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB
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# define CUBE_MAP_POSITIVE_Y GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB
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# define CUBE_MAP_NEGATIVE_Y GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB
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# define CUBE_MAP_POSITIVE_Z GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB
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# define CUBE_MAP_NEGATIVE_Z GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB
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#elif GL_EXT_texture_cube_map
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# define CUBE_MAP_POSITIVE_X GL_TEXTURE_CUBE_MAP_POSITIVE_X_EXT
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# define CUBE_MAP_NEGATIVE_X GL_TEXTURE_CUBE_MAP_NEGATIVE_X_EXT
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# define CUBE_MAP_POSITIVE_Y GL_TEXTURE_CUBE_MAP_POSITIVE_Y_EXT
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# define CUBE_MAP_NEGATIVE_Y GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_EXT
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# define CUBE_MAP_POSITIVE_Z GL_TEXTURE_CUBE_MAP_POSITIVE_Z_EXT
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# define CUBE_MAP_NEGATIVE_Z GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_EXT
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#endif
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# if GL_EXT_texture_cube_map || GL_ARB_texture_cube_map
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static GLenum faceTarget[6] =
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{
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CUBE_MAP_POSITIVE_X,
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CUBE_MAP_NEGATIVE_X,
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CUBE_MAP_POSITIVE_Y,
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CUBE_MAP_NEGATIVE_Y,
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CUBE_MAP_POSITIVE_Z,
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CUBE_MAP_NEGATIVE_Z
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};
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#endif
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TextureCubeMap::TextureCubeMap():
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_textureWidth(0),
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_textureHeight(0),
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_numMimpmapLevels(0)
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{
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}
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TextureCubeMap::TextureCubeMap(const TextureCubeMap& 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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_numMimpmapLevels(text._numMimpmapLevels),
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_subloadCallback(text._subloadCallback)
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{
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_images[0] = copyop(text._images[0].get());
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_images[1] = copyop(text._images[1].get());
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_images[2] = copyop(text._images[2].get());
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_images[3] = copyop(text._images[3].get());
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_images[4] = copyop(text._images[4].get());
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_images[5] = copyop(text._images[5].get());
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}
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TextureCubeMap::~TextureCubeMap()
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{
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}
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int TextureCubeMap::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(TextureCubeMap,sa)
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for (int n=0; n<6; n++)
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{
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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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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(_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 TextureCubeMap::setImage( Face face, Image* image)
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{
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dirtyTextureObject();
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_images[face] = image;
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}
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Image* TextureCubeMap::getImage(Face face)
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{
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return _images[face].get();
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}
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const Image* TextureCubeMap::getImage(Face face) const
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{
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return _images[face].get();
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}
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bool TextureCubeMap::imagesValid() const
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{
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for (int n=0; n<6; 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 TextureCubeMap::computeInternalFormat() const
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{
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if (imagesValid()) computeInternalFormatWithImage(*_images[0]);
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}
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void TextureCubeMap::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->isCubeMapSupported())
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return;
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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_CUBE_MAP, handle );
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if (getTextureParameterDirty(state.getContextID())) applyTexParameters(GL_TEXTURE_CUBE_MAP,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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}
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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_CUBE_MAP, handle );
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applyTexParameters(GL_TEXTURE_CUBE_MAP,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_CUBE_MAP, handle );
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}
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else if (imagesValid())
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{
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glGenTextures( 1L, (GLuint *)&handle );
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glBindTexture( GL_TEXTURE_CUBE_MAP, handle );
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applyTexParameters(GL_TEXTURE_CUBE_MAP,state);
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for (int n=0; n<6; n++)
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{
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applyTexImage2D( faceTarget[n], _images[n].get(), state, _textureWidth, _textureHeight, _numMimpmapLevels);
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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_CUBE_MAP, handle );
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}
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else
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{
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glBindTexture( GL_TEXTURE_CUBE_MAP, 0 );
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}
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}
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typedef buffered_value< ref_ptr<TextureCubeMap::Extensions> > BufferedExtensions;
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static BufferedExtensions s_extensions;
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const TextureCubeMap::Extensions* TextureCubeMap::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 TextureCubeMap::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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TextureCubeMap::Extensions::Extensions()
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{
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setupGLExtenions();
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}
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TextureCubeMap::Extensions::Extensions(const Extensions& rhs):
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Referenced()
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{
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_isCubeMapSupported = rhs._isCubeMapSupported;
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}
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void TextureCubeMap::Extensions::lowestCommonDenominator(const Extensions& rhs)
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{
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if (!rhs._isCubeMapSupported) _isCubeMapSupported = false;
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}
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void TextureCubeMap::Extensions::setupGLExtenions()
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{
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_isCubeMapSupported = isGLExtensionSupported("GL_ARB_texture_cube_map") ||
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isGLExtensionSupported("GL_EXT_texture_cube_map") ||
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strncmp((const char*)glGetString(GL_VERSION),"1.3",3)>=0;;
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}
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