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From Jan Peciva, "sending updated version of StencilTwoSided.

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It supports now even GL_ATI_separate_stencil extension and there are more
OSG_INFOs to see, which API is used."
This commit is contained in:
Robert Osfield
2011-06-17 09:05:48 +00:00
parent f04e841933
commit fde8b03b5c
1 changed files with 52 additions and 3 deletions
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55
src/osg/StencilTwoSided.cpp
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@@ -25,7 +25,7 @@ StencilTwoSided::StencilTwoSided()
_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;
@@ -106,13 +106,13 @@ void StencilTwoSided::apply(State& state) const
return;
}
// try to use two sided stencil extension
// try to use GL_EXT_stencil_two_side extension
if (extensions->isStencilTwoSidedSupported())
{
// enable two sided stenciling
glEnable(GL_STENCIL_TEST_TWO_SIDE);
// back face
// back face
extensions->glActiveStencilFace(GL_BACK);
glStencilOp((GLenum)_sfail[BACK],(GLenum)_zfail[BACK],(GLenum)_zpass[BACK]);
glStencilMask(_writeMask[BACK]);
@@ -126,6 +126,35 @@ void StencilTwoSided::apply(State& state) const
return;
}
// try to use GL_ATI_separate_stencil extension
if (extensions->isSeparateStencilSupported())
{
if( _writeMask[FRONT] != _writeMask[BACK] ||
_funcRef[FRONT] != _funcRef[BACK] ||
_funcMask[FRONT] != _funcMask[BACK] )
{
OSG_WARN << "StencilTwoSided uses GL_ATI_separate_stencil and there are different\n"
" write mask, functionRef or functionMask values for the front and back\n"
" faces. This is not supported by the extension. Using front values only." << std::endl;
}
glStencilMask(_writeMask[FRONT]);
// front face
extensions->glStencilOpSeparate(GL_FRONT, (GLenum)_sfail[FRONT], (GLenum)_zfail[FRONT], (GLenum)_zpass[FRONT]);
extensions->glStencilFuncSeparateATI((GLenum)_func[FRONT], (GLenum)_func[BACK], _funcRef[FRONT], _funcMask[FRONT]);
// back face
extensions->glStencilOpSeparate(GL_BACK, (GLenum)_sfail[BACK], (GLenum)_zfail[BACK], (GLenum)_zpass[BACK]);
extensions->glStencilFuncSeparateATI((GLenum)_func[FRONT], (GLenum)_func[BACK], _funcRef[FRONT], _funcMask[FRONT]);
return;
}
OSG_WARN << "StencilTwoSided failed as the required graphics capabilities were\n"
" not found (contextID " << contextID << "). OpenGL 2.0 or one of extensions\n"
" GL_EXT_stencil_two_side or GL_ATI_separate_stencil is required." << std::endl;
}
@@ -195,6 +224,26 @@ void StencilTwoSided::Extensions::setupGLExtensions(unsigned int contextID)
if (!_glStencilMaskSeparate) _isOpenGL20Supported = false;
if (!_glStencilFuncSeparate) _isOpenGL20Supported = false;
if (!_glStencilFuncSeparateATI) _isSeparateStencilSupported = false;
// notify
if( _isOpenGL20Supported )
{
OSG_INFO << "StencilTwoSided is going to use OpenGL 2.0 API (contextID " << contextID << ")." << std::endl;
}
else if( _isStencilTwoSidedSupported )
{
OSG_INFO << "StencilTwoSided is going to use GL_EXT_stencil_two_side extension (contextID " << contextID << ")." << std::endl;
}
else if( _isSeparateStencilSupported )
{
OSG_INFO << "StencilTwoSided is going to use GL_ATI_separate_stencil extension (contextID " << contextID << ")." << std::endl;
}
else
{
OSG_INFO << "StencilTwoSided did not found required graphics capabilities\n"
" (contextID " << contextID << "). OpenGL 2.0 or one of extensions\n"
" GL_EXT_stencil_two_side or GL_ATI_separate_stencil is required." << std::endl;
}
}
void StencilTwoSided::Extensions::glActiveStencilFace(GLenum face) const