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initial reverse-z depth implementation

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This commit is contained in:
glassmancody.info 2021-06-01 12:15:25 -07:00
parent 10d100f205
commit 70fac33940
46 changed files with 614 additions and 92 deletions
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39
components/sceneutil/util.cpp
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@ -285,4 +285,43 @@ bool attachAlphaToCoverageFriendlyFramebufferToCamera(osg::Camera* camera, osg::
return addMSAAIntermediateTarget;
}
osg::ref_ptr<osg::Depth> createDepth(bool reverseZ)
{
static osg::Depth::Function func = reverseZ ? osg::Depth::GEQUAL : osg::Depth::LEQUAL;
return new osg::Depth(func);
}
osg::Matrix getReversedZProjectionMatrixAsPerspectiveInf(double fov, double aspect, double near)
{
double A = 1.0/std::tan(osg::DegreesToRadians(fov)/2.0);
return osg::Matrix(
A/aspect, 0, 0, 0,
0, A, 0, 0,
0, 0, 0, -1,
0, 0, near, 0
);
}
osg::Matrix getReversedZProjectionMatrixAsPerspective(double fov, double aspect, double near, double far)
{
double A = 1.0/std::tan(osg::DegreesToRadians(fov)/2.0);
return osg::Matrix(
A/aspect, 0, 0, 0,
0, A, 0, 0,
0, 0, far/(far-near)-1.0, -1,
0, 0, -(far*near)/(far - near), 0
);
}
osg::Matrix getReversedZProjectionMatrixAsOrtho(double left, double right, double bottom, double top, double near, double far)
{
return osg::Matrix(
2/(right-left), 0, 0, 0,
0, 2/(top-bottom), 0, 0,
0, 0, 1/(far-near), 0,
(right+left)/(left-right), (top+bottom)/(bottom-top), far/(far-near), 1
);
}
}