85 lines
2.9 KiB
Plaintext
85 lines
2.9 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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#ifndef OSG_TRANSPARENCY
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#define OSG_TRANSPARENCY 1
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#include <osg/StateAttribute>
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namespace osg {
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/** Transparency - encapsulates the OpenGL blend/transparency state.*/
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class SG_EXPORT Transparency : public StateAttribute
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{
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public :
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Transparency();
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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Transparency(const Transparency& trans,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
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StateAttribute(trans,copyop),
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_source_factor(trans._source_factor),
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_destination_factor(trans._destination_factor) {}
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META_StateAttribute(osg, Transparency,TRANSPARENCY);
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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(Transparency,sa)
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// compare each paramter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_source_factor)
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COMPARE_StateAttribute_Parameter(_destination_factor)
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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 void getAssociatedModes(std::vector<GLMode>& modes) const
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{
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modes.push_back(GL_BLEND);
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}
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enum TransparencyMode {
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DST_ALPHA = GL_DST_ALPHA,
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DST_COLOR = GL_DST_COLOR,
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ONE = GL_ONE,
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ONE_MINUS_DST_ALPHA = GL_ONE_MINUS_DST_ALPHA,
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ONE_MINUS_DST_COLOR = GL_ONE_MINUS_DST_COLOR,
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ONE_MINUS_SRC_ALPHA = GL_ONE_MINUS_SRC_ALPHA,
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ONE_MINUS_SRC_COLOR = GL_ONE_MINUS_SRC_COLOR,
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SRC_ALPHA = GL_SRC_ALPHA,
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SRC_ALPHA_SATURATE = GL_SRC_ALPHA_SATURATE,
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SRC_COLOR = GL_SRC_COLOR,
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ZERO = GL_ZERO
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};
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inline void setFunction( const int source, const int destination )
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{
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_source_factor = source;
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_destination_factor = destination;
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}
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void setSource(const int source) { _source_factor = source; }
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inline const int getSource() const { return _source_factor; }
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void setDestination(const int destination) { _destination_factor = destination; }
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inline const int getDestination() const { return _destination_factor; }
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virtual void apply(State& state) const;
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protected :
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virtual ~Transparency();
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int _source_factor;
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int _destination_factor;
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};
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}
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#endif
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