d816acd834
By default, ShaderEffect creates a fragment shader; in order to be able to deprecate ClutterShader we need a way for ShaderEffect sub-classes to create a vertex shader if needed - By using a write-only, constructor only property. ClutterShader has, internally, a ClutterShaderType enumeration that can be used exactly for this. We just need to expose it and create a GObject property for ClutterShaderEffect.