Renderer interface lacks getters for many properties

[stephengold]

The com.jme3.renderer.Renderer interface defines setAlphaToCoverage(), setBackgroundColor(), setClipRect(), setDefaultAnisotropicFilter(), setDepthRange(), setLinearizeSrgbImages(), setMainFrameBufferSrgb(), and setViewPort(). However, it does not provide getters for any of these properties.

Runtime access to these properties might aid in debugging render issues.

[stephengold]

Further investigation indicates that many of these methods are used dynamically by the RenderManager: setBackgroundColor(), setClipRect(), setDepthRange(), and setViewPort(). The corresponding properties are probably of little interest to JME users, so perhaps skip them.

Properties of interest to users include "alphaToCoverage" and "defaultAnisotropicFilter". Not sure yet about "linearizeSrgbImages" and "mainFrameBufferSrgb".

[quazi-irfan]

I'll take a look at it tonight.

[stephengold]

It looks like "linearizeSrgbImages" and "mainFrameBufferSrgb" are set during initialization of the JmeContext and seldom changed thereafter. I infer that their settings might be of interest to users. I'll leave this issue open in case someone wants to implement them in the style of PR #1093.