Merge branch 'no-colour-fbo-for-shadows' into 'master'

Don't bind unnecessary colour buffer when drawing shadow maps

See merge request OpenMW/openmw!403

components/sceneutil/mwshadowtechnique.cpp

@@ -555,6 +555,7 @@ MWShadowTechnique::ShadowData::ShadowData(MWShadowTechnique::ViewDependentData*
     _camera = new osg::Camera;
     _camera->setName("ShadowCamera");
     _camera->setReferenceFrame(osg::Camera::ABSOLUTE_RF_INHERIT_VIEWPOINT);
+    _camera->setImplicitBufferAttachmentMask(0, 0);
 
     //_camera->setClearColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
     _camera->setClearColor(osg::Vec4(0.0f,0.0f,0.0f,0.0f));