239 lines
8.7 KiB
C++
239 lines
8.7 KiB
C++
/* -*-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.
|
|
*/
|
|
|
|
#include <osg/StencilTwoSided>
|
|
#include <osg/State>
|
|
#include <osg/GLExtensions>
|
|
#include <osg/Notify>
|
|
|
|
using namespace osg;
|
|
|
|
|
|
StencilTwoSided::StencilTwoSided()
|
|
{
|
|
// set up same defaults as glStencilFunc.
|
|
_func[FRONT] = _func[BACK] = ALWAYS;
|
|
_funcRef[FRONT] = _funcRef[BACK] = 0;
|
|
_funcMask[FRONT] = _funcMask[BACK] = ~0u;
|
|
|
|
// set up same defaults as glStencilOp.
|
|
_sfail[FRONT] = _sfail[BACK] = KEEP;
|
|
_zfail[FRONT] = _zfail[BACK] = KEEP;
|
|
_zpass[FRONT] = _zpass[BACK] = KEEP;
|
|
|
|
_writeMask[FRONT] = _writeMask[BACK] = ~0u;
|
|
}
|
|
|
|
StencilTwoSided::StencilTwoSided(const StencilTwoSided& stencil,const CopyOp& copyop):
|
|
StateAttribute(stencil,copyop)
|
|
{
|
|
_func[FRONT] = stencil._func[FRONT];
|
|
_funcRef[FRONT] = stencil._funcRef[FRONT];
|
|
_funcMask[FRONT] = stencil._funcMask[FRONT];
|
|
_sfail[FRONT] = stencil._sfail[FRONT];
|
|
_zfail[FRONT] = stencil._zfail[FRONT];
|
|
_zpass[FRONT] = stencil._zpass[FRONT];
|
|
_writeMask[FRONT] = stencil._writeMask[FRONT];
|
|
|
|
_func[BACK] = stencil._func[BACK];
|
|
_funcRef[BACK] = stencil._funcRef[BACK];
|
|
_funcMask[BACK] = stencil._funcMask[BACK];
|
|
_sfail[BACK] = stencil._sfail[BACK];
|
|
_zfail[BACK] = stencil._zfail[BACK];
|
|
_zpass[BACK] = stencil._zpass[BACK];
|
|
_writeMask[BACK] = stencil._writeMask[BACK];
|
|
}
|
|
|
|
StencilTwoSided::~StencilTwoSided()
|
|
{
|
|
}
|
|
|
|
int StencilTwoSided::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(StencilTwoSided,sa)
|
|
|
|
// compare each parameter in turn against the rhs.
|
|
COMPARE_StateAttribute_Parameter(_func[FRONT])
|
|
COMPARE_StateAttribute_Parameter(_funcRef[FRONT])
|
|
COMPARE_StateAttribute_Parameter(_funcMask[FRONT])
|
|
COMPARE_StateAttribute_Parameter(_sfail[FRONT])
|
|
COMPARE_StateAttribute_Parameter(_zfail[FRONT])
|
|
COMPARE_StateAttribute_Parameter(_zpass[FRONT])
|
|
COMPARE_StateAttribute_Parameter(_writeMask[FRONT])
|
|
|
|
COMPARE_StateAttribute_Parameter(_func[BACK])
|
|
COMPARE_StateAttribute_Parameter(_funcRef[BACK])
|
|
COMPARE_StateAttribute_Parameter(_funcMask[BACK])
|
|
COMPARE_StateAttribute_Parameter(_sfail[BACK])
|
|
COMPARE_StateAttribute_Parameter(_zfail[BACK])
|
|
COMPARE_StateAttribute_Parameter(_zpass[BACK])
|
|
COMPARE_StateAttribute_Parameter(_writeMask[BACK])
|
|
|
|
return 0; // passed all the above comparison macros, must be equal.
|
|
}
|
|
|
|
void StencilTwoSided::apply(State& state) const
|
|
{
|
|
// get "per-context" extensions
|
|
const unsigned int contextID = state.getContextID();
|
|
const Extensions* extensions = getExtensions(contextID,true);
|
|
|
|
// use OpenGL 2.0 functions if available
|
|
if (extensions->isOpenGL20Supported())
|
|
{
|
|
// front face
|
|
extensions->glStencilOpSeparate(GL_FRONT, (GLenum)_sfail[FRONT],(GLenum)_zfail[FRONT],(GLenum)_zpass[FRONT]);
|
|
extensions->glStencilMaskSeparate(GL_FRONT, _writeMask[FRONT]);
|
|
extensions->glStencilFuncSeparate(GL_FRONT, (GLenum)_func[FRONT],_funcRef[FRONT],_funcMask[FRONT]);
|
|
|
|
// back face
|
|
extensions->glStencilOpSeparate(GL_BACK, (GLenum)_sfail[BACK],(GLenum)_zfail[BACK],(GLenum)_zpass[BACK]);
|
|
extensions->glStencilMaskSeparate(GL_BACK, _writeMask[BACK]);
|
|
extensions->glStencilFuncSeparate(GL_BACK, (GLenum)_func[BACK],_funcRef[BACK],_funcMask[BACK]);
|
|
|
|
return;
|
|
}
|
|
|
|
// try to use two sided stencil extension
|
|
if (extensions->isStencilTwoSidedSupported())
|
|
{
|
|
// enable two sided stenciling
|
|
glEnable(GL_STENCIL_TEST_TWO_SIDE);
|
|
|
|
// back face
|
|
extensions->glActiveStencilFace(GL_BACK);
|
|
glStencilOp((GLenum)_sfail[BACK],(GLenum)_zfail[BACK],(GLenum)_zpass[BACK]);
|
|
glStencilMask(_writeMask[BACK]);
|
|
glStencilFunc((GLenum)_func[BACK],_funcRef[BACK],_funcMask[BACK]);
|
|
|
|
// front face
|
|
extensions->glActiveStencilFace(GL_FRONT);
|
|
glStencilOp((GLenum)_sfail[FRONT],(GLenum)_zfail[FRONT],(GLenum)_zpass[FRONT]);
|
|
glStencilMask(_writeMask[FRONT]);
|
|
glStencilFunc((GLenum)_func[FRONT],_funcRef[FRONT],_funcMask[FRONT]);
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
typedef buffered_value< ref_ptr<StencilTwoSided::Extensions> > BufferedExtensions;
|
|
static BufferedExtensions s_extensions;
|
|
|
|
StencilTwoSided::Extensions* StencilTwoSided::getExtensions(unsigned int contextID,bool createIfNotInitalized)
|
|
{
|
|
if (!s_extensions[contextID] && createIfNotInitalized) s_extensions[contextID] = new Extensions(contextID);
|
|
return s_extensions[contextID].get();
|
|
}
|
|
|
|
void StencilTwoSided::setExtensions(unsigned int contextID,Extensions* extensions)
|
|
{
|
|
s_extensions[contextID] = extensions;
|
|
}
|
|
|
|
StencilTwoSided::Extensions::Extensions(unsigned int contextID)
|
|
{
|
|
setupGLExtensions(contextID);
|
|
}
|
|
|
|
StencilTwoSided::Extensions::Extensions(const Extensions& rhs):
|
|
Referenced()
|
|
{
|
|
_isStencilTwoSidedSupported = rhs._isStencilTwoSidedSupported;
|
|
_isOpenGL20Supported = rhs._isOpenGL20Supported;
|
|
_isSeparateStencilSupported = rhs._isSeparateStencilSupported;
|
|
_glActiveStencilFace = rhs._glActiveStencilFace;
|
|
_glStencilOpSeparate = rhs._glStencilOpSeparate;
|
|
_glStencilMaskSeparate = rhs._glStencilMaskSeparate;
|
|
_glStencilFuncSeparate = rhs._glStencilFuncSeparate;
|
|
_glStencilFuncSeparateATI = rhs._glStencilFuncSeparateATI;
|
|
}
|
|
|
|
|
|
void StencilTwoSided::Extensions::lowestCommonDenominator(const Extensions& rhs)
|
|
{
|
|
if (!rhs._isStencilTwoSidedSupported) _isStencilTwoSidedSupported = false;
|
|
if (!rhs._isOpenGL20Supported) _isOpenGL20Supported = false;
|
|
if (!rhs._isSeparateStencilSupported) _isSeparateStencilSupported = false;
|
|
|
|
if (!rhs._glActiveStencilFace) _glActiveStencilFace = NULL;
|
|
if (!rhs._glStencilOpSeparate) _glStencilOpSeparate = NULL;
|
|
if (!rhs._glStencilMaskSeparate) _glStencilMaskSeparate = NULL;
|
|
if (!rhs._glStencilFuncSeparate) _glStencilFuncSeparate = NULL;
|
|
if (!rhs._glStencilFuncSeparateATI) _glStencilFuncSeparateATI = NULL;
|
|
}
|
|
|
|
void StencilTwoSided::Extensions::setupGLExtensions(unsigned int contextID)
|
|
{
|
|
// extension support
|
|
_isStencilTwoSidedSupported = isGLExtensionSupported(contextID, "GL_EXT_stencil_two_side");
|
|
_isOpenGL20Supported = getGLVersionNumber() >= 2.0;
|
|
_isSeparateStencilSupported = isGLExtensionSupported(contextID, "GL_ATI_separate_stencil");
|
|
|
|
// function pointers
|
|
setGLExtensionFuncPtr(_glActiveStencilFace, "glActiveStencilFaceEXT");
|
|
setGLExtensionFuncPtr(_glStencilOpSeparate, "glStencilOpSeparate", "glStencilOpSeparateATI");
|
|
setGLExtensionFuncPtr(_glStencilMaskSeparate, "glStencilMaskSeparate");
|
|
setGLExtensionFuncPtr(_glStencilFuncSeparate, "glStencilFuncSeparate");
|
|
setGLExtensionFuncPtr(_glStencilFuncSeparateATI, "glStencilFuncSeparateATI");
|
|
|
|
// protect against buggy drivers (maybe not necessary)
|
|
if (!_glActiveStencilFace) _isStencilTwoSidedSupported = false;
|
|
if (!_glStencilOpSeparate) { _isOpenGL20Supported = false; _isSeparateStencilSupported = false; }
|
|
if (!_glStencilMaskSeparate) _isOpenGL20Supported = false;
|
|
if (!_glStencilFuncSeparate) _isOpenGL20Supported = false;
|
|
if (!_glStencilFuncSeparateATI) _isSeparateStencilSupported = false;
|
|
}
|
|
|
|
void StencilTwoSided::Extensions::glActiveStencilFace(GLenum face) const
|
|
{
|
|
if (_isStencilTwoSidedSupported)
|
|
{
|
|
_glActiveStencilFace(face);
|
|
}
|
|
}
|
|
|
|
void StencilTwoSided::Extensions::glStencilOpSeparate(GLenum face, GLenum sfail, GLenum dpfail, GLenum dppass) const
|
|
{
|
|
if (_isOpenGL20Supported || _isSeparateStencilSupported)
|
|
{
|
|
_glStencilOpSeparate(face, sfail, dpfail, dppass);
|
|
}
|
|
}
|
|
|
|
void StencilTwoSided::Extensions::glStencilMaskSeparate(GLenum face, GLuint mask) const
|
|
{
|
|
if (_isOpenGL20Supported)
|
|
{
|
|
_glStencilMaskSeparate(face, mask);
|
|
}
|
|
}
|
|
|
|
void StencilTwoSided::Extensions::glStencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask) const
|
|
{
|
|
if (_isOpenGL20Supported)
|
|
{
|
|
_glStencilFuncSeparate(face, func, ref, mask);
|
|
}
|
|
}
|
|
|
|
void StencilTwoSided::Extensions::glStencilFuncSeparateATI(GLenum frontfunc, GLenum backfunc, GLint ref, GLuint mask) const
|
|
{
|
|
if (_isSeparateStencilSupported)
|
|
{
|
|
_glStencilFuncSeparateATI(frontfunc, backfunc, ref, mask);
|
|
}
|
|
}
|