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Make shadow maps use their whole depth range for the overlap with the view frustum and rely on depth clamping to ensure objects outside the frustum still cast shadows.

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This commit is contained in:
AnyOldName3 2018-11-20 23:02:28 +00:00
parent 660e423e99
commit 632b0d8979
1 changed files with 7 additions and 2 deletions
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9
components/sceneutil/mwshadowtechnique.cpp
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@ -1499,6 +1499,8 @@ void MWShadowTechnique::createShaders()
_shadowCastingStateSet->setTextureAttributeAndModes(0, _fallbackBaseTexture.get(), osg::StateAttribute::ON);
_shadowCastingStateSet->addUniform(new osg::Uniform("useDiffuseMapForShadowAlpha", false));
_shadowCastingStateSet->setMode(GL_DEPTH_CLAMP, osg::StateAttribute::ON);
// TODO: figure out if there's some way to disable depth sorting for translucent objects as we don't care about blending.
// TODO: compare performance when alpha testing is handled here versus using a discard in the fragment shader
// TODO: compare performance when we set a bunch of GL state to the default here with OVERRIDE set so that there are fewer pointless state switches
@ -2437,12 +2439,12 @@ bool MWShadowTechnique::cropShadowCameraToMainFrustum(Frustum& frustum, osg::Cam
xMax = osg::minimum(1.0, convexHull.max(0));
yMin = osg::maximum(-1.0, convexHull.min(1));
yMax = osg::minimum(1.0, convexHull.max(1));
zMin = osg::maximum(-1.0, convexHull.min(2));
zMax = osg::minimum(1.0, convexHull.max(2));
}
else
return false;
// we always want the lightspace to include the computed near plane.
zMin = -1.0;
if (xMin != -1.0 || yMin != -1.0 || zMin != -1.0 ||
xMax != 1.0 || yMax != 1.0 || zMax != 1.0)
{
@ -2464,11 +2466,14 @@ bool MWShadowTechnique::cropShadowCameraToMainFrustum(Frustum& frustum, osg::Cam
xMax = convexHull.max(0);
yMin = convexHull.min(1);
yMax = convexHull.max(1);
zMax = convexHull.max(2);
planeList.push_back(osg::Plane(0.0, -1.0, 0.0, yMax));
planeList.push_back(osg::Plane(0.0, 1.0, 0.0, -yMin));
planeList.push_back(osg::Plane(-1.0, 0.0, 0.0, xMax));
planeList.push_back(osg::Plane(1.0, 0.0, 0.0, -xMin));
planeList.push_back(osg::Plane(0.0, 0.0, -1.0, zMax));
// Don't add a zMin culling plane - we still want those objects, but don't care about their depth buffer value.
}
return true;