130 lines
4.2 KiB
C++
130 lines
4.2 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/BlendFunc>
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#include <osg/GLExtensions>
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#include <osg/State>
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#include <osg/Notify>
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using namespace osg;
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BlendFunc::BlendFunc():
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_source_factor(SRC_ALPHA),
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_destination_factor(ONE_MINUS_SRC_ALPHA),
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_source_factor_alpha(SRC_ALPHA),
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_destination_factor_alpha(ONE_MINUS_SRC_ALPHA)
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{
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}
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BlendFunc::BlendFunc(GLenum source, GLenum destination):
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_source_factor(source),
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_destination_factor(destination),
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_source_factor_alpha(source),
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_destination_factor_alpha(destination)
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{
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}
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BlendFunc::BlendFunc(GLenum source, GLenum destination, GLenum source_alpha, GLenum destination_alpha):
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_source_factor(source),
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_destination_factor(destination),
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_source_factor_alpha(source_alpha),
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_destination_factor_alpha(destination_alpha)
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{
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}
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BlendFunc::~BlendFunc()
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{
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}
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void BlendFunc::apply(State& state) const
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{
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if (_source_factor != _source_factor_alpha ||
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_destination_factor != _destination_factor_alpha)
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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->isBlendFuncSeparateSupported())
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{
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OSG_WARN<<"Warning: BlendFunc::apply(..) failed, BlendFuncSeparate is not support by OpenGL driver, falling back to BlendFunc."<<std::endl;
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}
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else
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{
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extensions->glBlendFuncSeparate(_source_factor, _destination_factor, _source_factor_alpha, _destination_factor_alpha);
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return;
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}
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}
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glBlendFunc( _source_factor, _destination_factor );
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}
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typedef buffered_value< ref_ptr<BlendFunc::Extensions> > BufferedExtensions;
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static BufferedExtensions s_extensions;
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BlendFunc::Extensions* BlendFunc::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 BlendFunc::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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BlendFunc::Extensions::Extensions(unsigned int contextID)
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{
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setupGLExtensions(contextID);
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}
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BlendFunc::Extensions::Extensions(const Extensions& rhs):
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Referenced()
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{
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_isBlendFuncSeparateSupported = rhs._isBlendFuncSeparateSupported;
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_glBlendFuncSeparate = rhs._glBlendFuncSeparate;
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}
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void BlendFunc::Extensions::lowestCommonDenominator(const Extensions& rhs)
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{
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if (!rhs._isBlendFuncSeparateSupported) _isBlendFuncSeparateSupported = false;
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if (!rhs._glBlendFuncSeparate) _glBlendFuncSeparate = 0;
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}
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void BlendFunc::Extensions::setupGLExtensions(unsigned int contextID)
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{
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_isBlendFuncSeparateSupported = OSG_GLES2_FEATURES || OSG_GL3_FEATURES ||
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isGLExtensionSupported(contextID, "GL_EXT_blend_func_separate") ||
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strncmp((const char*)glGetString(GL_VERSION), "1.4", 3) >= 0;
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setGLExtensionFuncPtr(_glBlendFuncSeparate, "glBlendFuncSeparate", "glBlendFuncSeparateEXT");
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}
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void BlendFunc::Extensions::glBlendFuncSeparate(GLenum sfactorRGB,
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GLenum dfactorRGB,
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GLenum sfactorAlpha,
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GLenum dfactorAlpha) const
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{
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if (_glBlendFuncSeparate)
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{
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_glBlendFuncSeparate(sfactorRGB, dfactorRGB, sfactorAlpha, dfactorAlpha);
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}
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else
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{
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OSG_WARN<<"Error: glBlendFuncSeparate not supported by OpenGL driver"<<std::endl;
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}
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}
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