d044d135f5
Goals:
- to handle INCR_WRAP values nicely if not supported by OpenGL (old hardware)
- to support two side stenciling of OpenGL 2.0. Current implementation does not work on ATI as it uses Nvidia extension.
Ready for commit:
- Stencil and Stencil.cpp - please, review them
Ready with "hack":
- StencilTwoSided.cpp: please, see the line 113 in apply():
glEnable(GL_STENCIL_TEST_TWO_SIDE);
This line used to be in getModeUsage() as
usage.usesMode(GL_STENCIL_TEST_TWO_SIDE);
but it produces OpenGL errors on ATI as it is unknown value there (it is Nvidia extension).
Problems with my "glEnable" solution:
- it enables two side stenciling forever, and it will disturb any other single-side stenciling in the scene graph.
"
229 lines
8.2 KiB
C++
229 lines
8.2 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_STENCIL
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#define OSG_STENCIL 1
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#include <osg/StateAttribute>
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namespace osg {
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#ifndef GL_INCR_WRAP
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#define GL_INCR_WRAP 0x8507
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#define GL_DECR_WRAP 0x8508
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#endif
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/** Encapsulate OpenGL glStencilFunc/Op/Mask functions.
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*
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* All functionality except INCR_WRAP and DECR_WRAP is supported by OpenGL 1.1.
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* INCR_WRAP an DECR_WRAP are available since OpenGL 1.4 or when
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* GL_EXT_stencil_wrap extension is present.
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*
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* If INCR_WRAP or DECR_WRAP values are used while they are detected to be not supported,
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* the INCR or DECR values are sent to OpenGL instead. Note: do not use Stencil::getFunction()
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* to detect whether WRAP operations is used as the object's value is kept intact.
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* Use osg::Stencil::getExtensions() method instead.
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*
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* OpenGL 2.0 introduced two side stenciling that is available through
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* osg::StencilTwoSided class.
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*/
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class OSG_EXPORT Stencil : public StateAttribute
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{
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public :
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Stencil();
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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Stencil(const Stencil& stencil,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
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StateAttribute(stencil,copyop),
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_func(stencil._func),
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_funcRef(stencil._funcRef),
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_funcMask(stencil._funcMask),
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_sfail(stencil._sfail),
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_zfail(stencil._zfail),
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_zpass(stencil._zpass),
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_writeMask(stencil._writeMask) {}
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META_StateAttribute(osg, Stencil, STENCIL);
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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_Parameter macro's below.
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COMPARE_StateAttribute_Types(Stencil,sa)
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// compare each parameter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_func)
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COMPARE_StateAttribute_Parameter(_funcRef)
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COMPARE_StateAttribute_Parameter(_funcMask)
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COMPARE_StateAttribute_Parameter(_sfail)
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COMPARE_StateAttribute_Parameter(_zfail)
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COMPARE_StateAttribute_Parameter(_zpass)
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COMPARE_StateAttribute_Parameter(_writeMask)
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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 bool getModeUsage(StateAttribute::ModeUsage& usage) const
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{
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usage.usesMode(GL_STENCIL_TEST);
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return true;
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}
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enum Function
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{
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NEVER = GL_NEVER,
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LESS = GL_LESS,
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EQUAL = GL_EQUAL,
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LEQUAL = GL_LEQUAL,
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GREATER = GL_GREATER,
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NOTEQUAL = GL_NOTEQUAL,
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GEQUAL = GL_GEQUAL,
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ALWAYS = GL_ALWAYS
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};
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inline void setFunction(Function func,int ref,unsigned int mask)
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{
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_func = func;
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_funcRef = ref;
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_funcMask = mask;
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}
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inline void setFunction(Function func) { _func = func; }
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inline Function getFunction() const { return _func; }
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inline void setFunctionRef(int ref) { _funcRef=ref; }
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inline int getFunctionRef() const { return _funcRef; }
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inline void setFunctionMask(unsigned int mask) { _funcMask=mask; }
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inline unsigned int getFunctionMask() const { return _funcMask; }
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enum Operation
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{
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KEEP = GL_KEEP,
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ZERO = GL_ZERO,
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REPLACE = GL_REPLACE,
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INCR = GL_INCR,
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DECR = GL_DECR,
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INVERT = GL_INVERT,
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INCR_WRAP = GL_INCR_WRAP,
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DECR_WRAP = GL_DECR_WRAP
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};
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/** set the operations to apply when the various stencil and depth
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* tests fail or pass. First parameter is to control the operation
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* when the stencil test fails. The second parameter is to control the
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* operation when the stencil test passes, but depth test fails. The
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* third parameter controls the operation when both the stencil test
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* and depth pass. Ordering of parameter is the same as if using
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* glStencilOp(,,).*/
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inline void setOperation(Operation sfail, Operation zfail, Operation zpass)
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{
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_sfail = sfail;
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_zfail = zfail;
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_zpass = zpass;
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}
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/** set the operation when the stencil test fails.*/
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inline void setStencilFailOperation(Operation sfail) { _sfail = sfail; }
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/** get the operation when the stencil test fails.*/
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inline Operation getStencilFailOperation() const { return _sfail; }
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/** set the operation when the stencil test passes but the depth test fails.*/
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inline void setStencilPassAndDepthFailOperation(Operation zfail) { _zfail=zfail; }
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/** get the operation when the stencil test passes but the depth test fails.*/
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inline Operation getStencilPassAndDepthFailOperation() const { return _zfail; }
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/** set the operation when both the stencil test and the depth test pass.*/
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inline void setStencilPassAndDepthPassOperation(Operation zpass) { _zpass=zpass; }
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/** get the operation when both the stencil test and the depth test pass.*/
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inline Operation getStencilPassAndDepthPassOperation() const { return _zpass; }
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inline void setWriteMask(unsigned int mask) { _writeMask = mask; }
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inline unsigned int getWriteMask() const { return _writeMask; }
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virtual void apply(State& state) const;
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/** Extensions class which encapsulates the querying of extensions and
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* associated function pointers, and provide convenience wrappers to
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* check for the extensions or use the associated functions.
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*/
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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 setStencilWrapSupported(bool flag) { _isStencilWrapSupported = flag; }
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bool isStencilWrapSupported() const { return _isStencilWrapSupported; }
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protected:
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~Extensions() {}
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bool _isStencilWrapSupported;
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};
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/** Function to call to get the extension of a specified context.
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* If the Extension object for that context has not yet been created
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* and the 'createIfNotInitalized' flag been set to false then returns NULL.
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* If 'createIfNotInitalized' is true then the Extensions object is
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* automatically created. However, in this case the extension object
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* will only be created with the graphics context associated with ContextID.
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*/
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static Extensions* getExtensions(unsigned int contextID, bool createIfNotInitalized);
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/** The setExtensions method 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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*/
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static void setExtensions(unsigned int contextID, Extensions* extensions);
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protected:
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virtual ~Stencil();
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Function _func;
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int _funcRef;
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unsigned int _funcMask;
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Operation _sfail;
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Operation _zfail;
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Operation _zpass;
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unsigned int _writeMask;
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};
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}
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#endif
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