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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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_MULTISAMPLE
#define OSG_MULTISAMPLE 1
#include <osg/GL>
#include <osg/StateAttribute>
#include <osg/ref_ptr>
#ifndef GL_ARB_multisample
#define GL_MULTISAMPLE_ARB 0x809D
#define GL_SAMPLE_ALPHA_TO_COVERAGE_ARB 0x809E
#define GL_SAMPLE_ALPHA_TO_ONE_ARB 0x809F
#define GL_SAMPLE_COVERAGE_ARB 0x80A0
#define GL_SAMPLE_BUFFERS_ARB 0x80A8
#define GL_SAMPLES_ARB 0x80A9
#define GL_SAMPLE_COVERAGE_VALUE_ARB 0x80AA
#define GL_SAMPLE_COVERAGE_INVERT_ARB 0x80AB
#define GL_MULTISAMPLE_BIT_ARB 0x20000000
#endif
#ifndef GL_NV_multisample_filter_hint
#define GL_MULTISAMPLE_FILTER_HINT_NV 0x8534
#endif
namespace osg {
/** Multisample - encapsulates the OpenGL Multisample state.*/
class OSG_EXPORT Multisample : public StateAttribute
{
public :
enum Mode
{
FASTEST = GL_FASTEST,
NICEST = GL_NICEST,
DONT_CARE = GL_DONT_CARE
};
Multisample();
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
Multisample(const Multisample& trans,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
StateAttribute(trans,copyop),
_coverage(trans._coverage),
_invert(trans._invert),
_mode(trans._mode) {}
META_StateAttribute(osg, Multisample,MULTISAMPLE);
/** 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_Parameter macros below.
COMPARE_StateAttribute_Types(Multisample,sa)
// compare each parameter in turn against the rhs.
COMPARE_StateAttribute_Parameter(_coverage)
COMPARE_StateAttribute_Parameter(_invert)
COMPARE_StateAttribute_Parameter(_mode)
return 0; // passed all the above comparison macros, must be equal.
}
void setSampleCoverage(float coverage, bool invert)
{
_coverage = coverage;
_invert = invert;
}
inline void setCoverage(float coverage) { _coverage=coverage; }
inline float getCoverage() const { return _coverage; }
inline void setInvert(bool invert) { _invert=invert; }
inline bool getInvert() const { return _invert; }
inline void setHint(Mode mode) { _mode = mode; }
inline Mode getHint() const { return _mode; }
virtual void apply(State& state) const;
/** Extensions class which encapsulates the querying of extensions and
* associated function pointers, and provide convenience wrappers to
* check for the extensions or use the associated functions.*/
class OSG_EXPORT Extensions : public osg::Referenced
{
public:
Extensions(unsigned int contextID);
Extensions(const Extensions& rhs);
void lowestCommonDenominator(const Extensions& rhs);
void setupGLExtensions(unsigned int contextID);
void setMultisampleSupported(bool flag) { _isMultisampleSupported=flag; }
void setMultisampleFilterHintSupported(bool flag) { _isMultisampleFilterHintSupported=flag; }
bool isMultisampleSupported() const { return _isMultisampleSupported; }
bool isMultisampleFilterHintSupported() const { return _isMultisampleFilterHintSupported; }
void glSampleCoverage(GLclampf value, GLboolean invert) const;
protected:
~Extensions() {}
bool _isMultisampleSupported;
bool _isMultisampleFilterHintSupported;
typedef void (GL_APIENTRY * GLSampleCoverageProc) (GLclampf value, GLboolean invert);
GLSampleCoverageProc _glSampleCoverage;
};
/** Function to call to get the extension of a specified context.
* If the Extension object for that context has not yet been created
* and the 'createIfNotInitalized' flag been set to false then returns NULL.
* If 'createIfNotInitalized' is true then the Extensions object is
* automatically created. However, in this case the extension object will
* only be created with the graphics context associated with ContextID..*/
static Extensions* getExtensions(unsigned int contextID,bool createIfNotInitalized);
/** setExtensions allows users to override the extensions across graphics contexts.
* Typically used when you have different extensions supported across graphics pipes
* but need to ensure that they all use the same low common denominator extensions.*/
static void setExtensions(unsigned int contextID,Extensions* extensions);
protected :
virtual ~Multisample();
float _coverage;
bool _invert;
Mode _mode;
};
}
#endif