perf(rendering): use MONO rendering stage

[skaldarnar]

Contains

Use the MONO rendering stage in a single rendering pass instead of two rendering passes for the LEFT_EYE and RIGHT_EYE.

I believe this is a left-over/bug from removing VR support. In previous revisions, the MONO stage was used when not supporting VR.

Terasology/engine/src/main/java/org/terasology/engine/core/modes/StateIngame.java

Lines 213 to 218 in 602ef46

	if (!context.get(Config.class).getRendering().isVrSupport()) {
	worldRenderer.render(RenderingStage.MONO);
	} else {
	worldRenderer.render(RenderingStage.LEFT_EYE);
	worldRenderer.render(RenderingStage.RIGHT_EYE);
	}

How to test

Run the game and check for any rendering quirks.

The game should run a bit smoother (some rough profiling suggests that the second rendering pass accounted for 25% of the total rendering time).

Outstanding before merging

n/a

[BenjaminAmos]

This does appears to reduce the worst-case rendering times by around half. I did not notice any additional rendering issues in-game (although this does not in itself solve the stuttering problem).