122 lines
4.3 KiB
C++
122 lines
4.3 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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#ifndef OSG_BLENDCOLOR
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#define OSG_BLENDCOLOR 1
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#include <osg/GL>
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#include <osg/StateAttribute>
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#include <osg/ref_ptr>
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#include <osg/Vec4>
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namespace osg {
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/** BlendColor - encapsulates the OpenGL blend/transparency state.*/
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class SG_EXPORT BlendColor : public StateAttribute
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{
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public :
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BlendColor();
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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BlendColor(const BlendColor& trans,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
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StateAttribute(trans,copyop),
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_constantColor(trans._constantColor) {}
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META_StateAttribute(osg, BlendColor,BLENDCOLOR);
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/** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
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virtual int 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(BlendColor,sa)
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// compare each paramter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_constantColor)
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return 0; // passed all the above comparison macro's, must be equal.
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}
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virtual bool getModeUsage(ModeUsage& usage) const
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{
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usage.usesMode(GL_BLEND);
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return true;
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}
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void setConstantColor(const osg::Vec4& color) { _constantColor = color; }
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inline osg::Vec4 getConstantColor() const { return _constantColor; }
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virtual void apply(State& state) const;
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/** Extensions class which encapsulates the querring of extensions and
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* associated function pointers, and provide convinience wrappers to
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* check for the extensions or use the associated functions.*/
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class SG_EXPORT Extensions : public osg::Referenced
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{
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public:
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Extensions();
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Extensions(const Extensions& rhs);
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void lowestCommonDenominator(const Extensions& rhs);
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void setupGLExtenions();
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void setBlendColorSupported(bool flag) { _isBlendColorSupported=flag; }
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bool isBlendColorSupported() const { return _isBlendColorSupported; }
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void setBlendColorProc(void* ptr) { _glBlendColor = ptr; }
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void glBlendColor(GLclampf red , GLclampf green , GLclampf blue , GLclampf alpha) const;
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protected:
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~Extensions() {}
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bool _isBlendColorSupported;
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void* _glBlendColor;
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};
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/** Function to call to get the extension of a specified context.
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* If the Exentsion object for that context has not yet been created then
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* and the 'createIfNotInitalized' flag been set to false then returns NULL.
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* If 'createIfNotInitalized' is true then the Extensions object is
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* automatically created. However, in this case the extension object
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* only be created with the graphics context associated with ContextID..*/
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static Extensions* getExtensions(unsigned int contextID,bool createIfNotInitalized);
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/** setExtensions allows users to override the extensions across graphics contexts.
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* typically used when you have different extensions supported across graphics pipes
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* but need to ensure that they all use the same low common denominator extensions.*/
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static void setExtensions(unsigned int contextID,Extensions* extensions);
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protected :
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virtual ~BlendColor();
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osg::Vec4 _constantColor;
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};
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}
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#endif
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