107 lines
3.1 KiB
C++
107 lines
3.1 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/BlendColor>
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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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BlendColor::BlendColor() :
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_constantColor(0.0f,0.0f,0.0f,0.0f)
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{
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}
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BlendColor::~BlendColor()
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{
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}
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void BlendColor::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->isBlendColorSupported())
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{
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notify(WARN)<<"Warning: BlendColor::apply(..) failed, BlendColor is not support by OpenGL driver."<<std::endl;
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return;
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}
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extensions->glBlendColor(_constantColor[0], _constantColor[1],
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_constantColor[2], _constantColor[3]);
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}
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typedef buffered_value< ref_ptr<BlendColor::Extensions> > BufferedExtensions;
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static BufferedExtensions s_extensions;
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BlendColor::Extensions* BlendColor::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 BlendColor::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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BlendColor::Extensions::Extensions()
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{
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setupGLExtenions();
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}
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BlendColor::Extensions::Extensions(const Extensions& rhs):
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Referenced()
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{
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_isBlendColorSupported = rhs._isBlendColorSupported;
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}
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void BlendColor::Extensions::lowestCommonDenominator(const Extensions& rhs)
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{
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if (!rhs._isBlendColorSupported) _isBlendColorSupported = false;
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if (!rhs._glBlendColor) _glBlendColor = 0;
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}
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void BlendColor::Extensions::setupGLExtenions()
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{
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_isBlendColorSupported = isGLExtensionSupported("GL_EXT_blend_color") ||
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strncmp((const char*)glGetString(GL_VERSION),"1.2",3)>=0;
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_glBlendColor = getGLExtensionFuncPtr("glBlendColor", "glBlendColorEXT");
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}
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void BlendColor::Extensions::glBlendColor(GLclampf red , GLclampf green , GLclampf blue , GLclampf alpha) const
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{
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if (_glBlendColor)
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{
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typedef void (APIENTRY * GLBlendColorProc) (GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
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((GLBlendColorProc)_glBlendColor)(red, green, blue, alpha);
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}
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else
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{
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notify(WARN)<<"Error: glBlendColor not supported by OpenGL driver"<<std::endl;
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}
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}
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