126 lines
4.3 KiB
C++
126 lines
4.3 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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#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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/** Encapsulates OpenGL blend/transparency state. */
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class OSG_EXPORT BlendColor : public StateAttribute
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{
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public :
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BlendColor();
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BlendColor(const osg::Vec4& constantColor);
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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 for equal types, then create the rhs variable
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// used by the COMPARE_StateAttribute_Paramter macros below.
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COMPARE_StateAttribute_Types(BlendColor,sa)
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// Compare each parameter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_constantColor)
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return 0; // Passed all the above comparison macros, so must be equal.
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}
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virtual bool getModeUsage(StateAttribute::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() { return _constantColor; }
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inline const osg::Vec4& getConstantColor() const { return _constantColor; }
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virtual void apply(State& state) const;
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/** Encapsulates queries of extension availability, obtains extension
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* function pointers, and provides convenience wrappers for
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* calling extension functions. */
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class OSG_EXPORT Extensions : public osg::Referenced
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{
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public:
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Extensions(unsigned int contextID);
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Extensions(const Extensions& rhs);
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void lowestCommonDenominator(const Extensions& rhs);
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void setupGLExtensions(unsigned int contextID);
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void setBlendColorSupported(bool flag) { _isBlendColorSupported=flag; }
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bool isBlendColorSupported() const { return _isBlendColorSupported; }
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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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typedef void (GL_APIENTRY * GLBlendColorProc) (GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
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bool _isBlendColorSupported;
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GLBlendColorProc _glBlendColor;
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};
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/** Returns the Extensions object for the given context.
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* If createIfNotInitalized is true and the Extensions object doesn't
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* exist, getExtensions() creates it on the given context.
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* Returns NULL if createIfNotInitalized is false and the Extensions
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* object doesn't exist. */
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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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