Lua scripting: add a wrapper for FloatProperty

To make it possible to access GlImageResampler's p_resampleScale
property from Lua, FloatProperty and the classes it depends on have been
wrapped using SWIG.

References #1

core/bindings/campvis.i

@@ -5,6 +5,7 @@
 %{
 #include "core/properties/genericproperty.h"
 #include "core/properties/numericproperty.h"
+#include "core/properties/floatingpointproperty.h"
 #include "core/properties/datanameproperty.h"
 #include "core/properties/transferfunctionproperty.h"
 #include "core/pipeline/abstractprocessor.h"
@@ -71,7 +72,7 @@ namespace campvis {
     };
 
     template<typename T>
-    class NumericProperty {
+    class NumericProperty : public GenericProperty<T> {
     public:
         NumericProperty(
             const std::string& name,
@@ -85,9 +86,44 @@ namespace campvis {
         virtual ~NumericProperty();
     };
 
+    %template(Ivec2GenericProperty) GenericProperty< tgt::Vector2<int> >;
     %template(IVec2Property) NumericProperty< tgt::Vector2<int> >;
     typedef NumericProperty< tgt::Vector2<int> > IVec2Property;
 
+
+    template<typename T>
+    struct FloatingPointPropertyTraits {};
+
+    template<>
+    struct FloatingPointPropertyTraits<float> {
+        typedef int DecimalsType;
+    };
+
+    %template() FloatingPointPropertyTraits<float>;
+
+    template<typename T>
+    class FloatingPointProperty : public NumericProperty<T> {
+    public:
+        typedef typename FloatingPointPropertyTraits<T>::DecimalsType DecimalsType;
+
+        FloatingPointProperty(
+            const std::string& name,
+            const std::string& title,
+            const T& value,
+            const T& minValue,
+            const T& maxValue,
+            const T& stepValue = T(0.01f),
+            const DecimalsType& decimals = DecimalsType(3),
+            int invalidationLevel = AbstractProcessor::INVALID_RESULT);
+
+        virtual ~FloatingPointProperty();
+    };
+
+    %template(FloatGenericProperty) GenericProperty<float>;
+    %template(FloatNumericProperty) NumericProperty<float>;
+    %template(FloatProperty) FloatingPointProperty<float>;
+    typedef FloatingPointProperty< float > FloatProperty;
+
     /* AbstractProcessor */
 
     class AbstractProcessor {

modules/preprocessing/bindings/preprocessing.i

@@ -17,6 +17,7 @@ namespace campvis {
         %immutable;
         campvis::DataNameProperty p_inputImage;
         campvis::DataNameProperty p_outputImage;
+        campvis::FloatProperty p_resampleScale;
         %mutable;
     };
 }

scripting/script.lua

@@ -42,6 +42,8 @@ function pipeline:init()
     dvrTF:addGeometry(geometry2)
 
     self.ve:getProperty("TransferFunction"):replaceTF(dvrTF)
+
+    self.resampler.p_resampleScale:setValue(1.25)
 end
 
 function pipeline:deinit()