112 lines
3.8 KiB
C++
112 lines
3.8 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_BLENDFUNC
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#define OSG_BLENDFUNC 1
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#include <osg/StateAttribute>
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#ifndef GL_VERSION_1_2
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#define GL_CONSTANT_COLOR 0x8001
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#define GL_ONE_MINUS_CONSTANT_COLOR 0x8002
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#define GL_CONSTANT_ALPHA 0x8003
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#define GL_ONE_MINUS_CONSTANT_ALPHA 0x8004
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#define GL_BLEND_COLOR 0x8005
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#endif
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namespace osg {
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/** Encapsulates OpenGL blend/transparency state. */
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class SG_EXPORT BlendFunc : public StateAttribute
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{
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public :
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BlendFunc();
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BlendFunc(GLenum source, GLenum destination);
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/** Copy constructor using CopyOp to manage deep vs shallow copy. */
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BlendFunc(const BlendFunc& 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, BlendFunc,BLENDFUNC);
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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(BlendFunc,sa)
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// Compare each parameter 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 macros, so 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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enum BlendFuncMode {
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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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CONSTANT_COLOR = GL_CONSTANT_COLOR,
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ONE_MINUS_CONSTANT_COLOR = GL_ONE_MINUS_CONSTANT_COLOR,
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CONSTANT_ALPHA = GL_CONSTANT_ALPHA,
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ONE_MINUS_CONSTANT_ALPHA = GL_ONE_MINUS_CONSTANT_ALPHA,
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ZERO = GL_ZERO
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};
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inline void setFunction( GLenum source, GLenum 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(GLenum source) { _source_factor = source; }
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inline GLenum getSource() const { return _source_factor; }
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void setDestination(GLenum destination) { _destination_factor = destination; }
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inline GLenum 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 ~BlendFunc();
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GLenum _source_factor;
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GLenum _destination_factor;
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};
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}
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#endif
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