110 lines
3.7 KiB
C++
110 lines
3.7 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
|
|
*
|
|
* This library is open source and may be redistributed and/or modified under
|
|
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
|
|
* (at your option) any later version. The full license is in LICENSE file
|
|
* included with this distribution, and on the openscenegraph.org website.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* OpenSceneGraph Public License for more details.
|
|
*/
|
|
|
|
#ifndef OSG_BLENDFUNC
|
|
#define OSG_BLENDFUNC 1
|
|
|
|
#include <osg/StateAttribute>
|
|
|
|
|
|
#ifndef GL_VERSION_1_2
|
|
#define GL_CONSTANT_COLOR 0x8001
|
|
#define GL_ONE_MINUS_CONSTANT_COLOR 0x8002
|
|
#define GL_CONSTANT_ALPHA 0x8003
|
|
#define GL_ONE_MINUS_CONSTANT_ALPHA 0x8004
|
|
#define GL_BLEND_COLOR 0x8005
|
|
#endif
|
|
|
|
|
|
|
|
namespace osg {
|
|
|
|
/** BlendFunc - encapsulates the OpenGL blend/transparency state.*/
|
|
class SG_EXPORT BlendFunc : public StateAttribute
|
|
{
|
|
public :
|
|
|
|
BlendFunc();
|
|
|
|
BlendFunc(GLenum source, GLenum destination);
|
|
|
|
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
|
|
BlendFunc(const BlendFunc& trans,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
|
|
StateAttribute(trans,copyop),
|
|
_source_factor(trans._source_factor),
|
|
_destination_factor(trans._destination_factor) {}
|
|
|
|
META_StateAttribute(osg, BlendFunc,BLENDFUNC);
|
|
|
|
/** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
|
|
virtual int compare(const StateAttribute& sa) const
|
|
{
|
|
// check the types are equal and then create the rhs variable
|
|
// used by the COMPARE_StateAttribute_Paramter macro's below.
|
|
COMPARE_StateAttribute_Types(BlendFunc,sa)
|
|
|
|
// compare each paramter in turn against the rhs.
|
|
COMPARE_StateAttribute_Parameter(_source_factor)
|
|
COMPARE_StateAttribute_Parameter(_destination_factor)
|
|
|
|
return 0; // passed all the above comparison macro's, must be equal.
|
|
}
|
|
|
|
virtual bool getModeUsage(ModeUsage& usage) const
|
|
{
|
|
usage.usesMode(GL_BLEND);
|
|
return true;
|
|
}
|
|
|
|
enum BlendFuncMode {
|
|
DST_ALPHA = GL_DST_ALPHA,
|
|
DST_COLOR = GL_DST_COLOR,
|
|
ONE = GL_ONE,
|
|
ONE_MINUS_DST_ALPHA = GL_ONE_MINUS_DST_ALPHA,
|
|
ONE_MINUS_DST_COLOR = GL_ONE_MINUS_DST_COLOR,
|
|
ONE_MINUS_SRC_ALPHA = GL_ONE_MINUS_SRC_ALPHA,
|
|
ONE_MINUS_SRC_COLOR = GL_ONE_MINUS_SRC_COLOR,
|
|
SRC_ALPHA = GL_SRC_ALPHA,
|
|
SRC_ALPHA_SATURATE = GL_SRC_ALPHA_SATURATE,
|
|
SRC_COLOR = GL_SRC_COLOR,
|
|
CONSTANT_ALPHA = GL_CONSTANT_ALPHA,
|
|
ONE_MINUS_CONSTANT_ALPHA = GL_ONE_MINUS_CONSTANT_ALPHA,
|
|
ZERO = GL_ZERO
|
|
};
|
|
|
|
inline void setFunction( GLenum source, GLenum destination )
|
|
{
|
|
_source_factor = source;
|
|
_destination_factor = destination;
|
|
}
|
|
|
|
void setSource(GLenum source) { _source_factor = source; }
|
|
inline GLenum getSource() const { return _source_factor; }
|
|
|
|
void setDestination(GLenum destination) { _destination_factor = destination; }
|
|
inline GLenum getDestination() const { return _destination_factor; }
|
|
|
|
virtual void apply(State& state) const;
|
|
|
|
protected :
|
|
|
|
virtual ~BlendFunc();
|
|
|
|
GLenum _source_factor;
|
|
GLenum _destination_factor;
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|