cleaned up variant of https://github.com/GarageGames/Torque3D/pull/768 alterations: opengl support, in-shader bug-reporting, direction vector fit to material slider-bar.

Engine/source/materials/processedMaterial.h

@@ -197,6 +197,9 @@ public:
    /// Returns true if any pass glows
    bool hasGlow() const { return mHasGlow; }
 
+   /// Returns true if any pass accumulates
+   bool hasAccumulation() const { return mHasAccumulation; }
+
    /// Gets the stage number for a pass
    U32 getStageFromPass(U32 pass) const
    {
@@ -244,6 +247,9 @@ protected:
    /// If we glow
    bool mHasGlow;
 
+   /// If we have accumulation.
+   bool mHasAccumulation;
+
    /// Number of stages (not to be confused with number of passes)
    U32 mMaxStages;