a1bda0dab8
Note, this required adding a unsigned int context ID to the osg::isGLUExtensionSupported(,) and osg::isGLExtensionSupported(,) functions. This may require reimplementation of end user code to accomodate the new calling convention.
110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 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/BlendEquation>
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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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#include <osg/buffered_value>
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using namespace osg;
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BlendEquation::BlendEquation():
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_equation(FUNC_ADD)
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{
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}
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BlendEquation::BlendEquation(Equation equation):
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_equation(equation)
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{
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}
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BlendEquation::~BlendEquation()
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{
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}
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void BlendEquation::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->isBlendEquationSupported())
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{
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notify(WARN)<<"Warning: BlendEquation::apply(..) failed, BlendEquation is not support by OpenGL driver."<<std::endl;
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return;
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}
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extensions->glBlendEquation(static_cast<GLenum>(_equation));
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}
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typedef buffered_value< ref_ptr<BlendEquation::Extensions> > BufferedExtensions;
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static BufferedExtensions s_extensions;
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BlendEquation::Extensions* BlendEquation::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 BlendEquation::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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BlendEquation::Extensions::Extensions(unsigned int contextID)
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{
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setupGLExtenions(contextID);
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}
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BlendEquation::Extensions::Extensions(const Extensions& rhs):
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Referenced()
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{
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_isBlendEquationSupported = rhs._isBlendEquationSupported;
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}
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void BlendEquation::Extensions::lowestCommonDenominator(const Extensions& rhs)
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{
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if (!rhs._isBlendEquationSupported) _isBlendEquationSupported = false;
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if (!rhs._glBlendEquation) _glBlendEquation = 0;
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}
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void BlendEquation::Extensions::setupGLExtenions(unsigned int contextID)
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{
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_isBlendEquationSupported = isGLExtensionSupported(contextID,"GL_EXT_blend_equation") ||
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strncmp((const char*)glGetString(GL_VERSION),"1.2",3)>=0;
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_glBlendEquation = getGLExtensionFuncPtr("glBlendEquation", "glBlendEquationEXT");
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}
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void BlendEquation::Extensions::glBlendEquation(GLenum mode) const
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{
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if (_glBlendEquation)
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{
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typedef void (APIENTRY * GLBlendEquationProc) (GLenum mode);
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((GLBlendEquationProc)_glBlendEquation)(mode);
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}
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else
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{
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notify(WARN)<<"Error: glBlendEquation not supported by OpenGL driver"<<std::endl;
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}
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}
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