MaterialManager and MaterialGroup refactor

- Material manager builder
 - No more overload render method/IProgramCallback
 - MaterialRenderers accept a Program consumer instead

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/render/ContraptionGroup.java

@@ -0,0 +1,25 @@
+package com.simibubi.create.content.contraptions.components.structureMovement.render;
+
+import com.jozufozu.flywheel.backend.material.MaterialGroup;
+import com.jozufozu.flywheel.backend.material.MaterialManager;
+import com.jozufozu.flywheel.backend.state.IRenderState;
+
+public class ContraptionGroup<P extends ContraptionProgram> extends MaterialGroup<P> {
+
+	private final RenderedContraption contraption;
+
+	public ContraptionGroup(RenderedContraption contraption, MaterialManager<P> owner, IRenderState state) {
+		super(owner, state);
+
+		this.contraption = contraption;
+	}
+
+	@Override
+	public void setup(P program) {
+		contraption.setup(program);
+	}
+
+	public static <P extends ContraptionProgram> MaterialManager.GroupFactory<P> forContraption(RenderedContraption c) {
+		return (materialManager, state) -> new ContraptionGroup<>(c, materialManager, state);
+	}
+}

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/render/ContraptionRenderDispatcher.java

@@ -5,9 +5,6 @@ import static org.lwjgl.opengl.GL11.glBindTexture;
 import static org.lwjgl.opengl.GL11.glDisable;
 import static org.lwjgl.opengl.GL11.glEnable;
 import static org.lwjgl.opengl.GL12.GL_TEXTURE_3D;
-import static org.lwjgl.opengl.GL13.GL_TEXTURE0;
-import static org.lwjgl.opengl.GL13.GL_TEXTURE4;
-import static org.lwjgl.opengl.GL13.glActiveTexture;
 import static org.lwjgl.opengl.GL20.glUseProgram;
 
 import java.util.List;
@@ -16,6 +13,7 @@ import java.util.Random;
 import org.apache.commons.lang3.tuple.Pair;
 
 import com.jozufozu.flywheel.backend.Backend;
+import com.jozufozu.flywheel.backend.gl.GlTextureUnit;
 import com.jozufozu.flywheel.backend.state.RenderLayer;
 import com.jozufozu.flywheel.event.BeginFrameEvent;
 import com.jozufozu.flywheel.event.GatherContextEvent;
@@ -116,7 +114,7 @@ public class ContraptionRenderDispatcher {
 
 		layer.setupRenderState();
 		glEnable(GL_TEXTURE_3D);
-		glActiveTexture(GL_TEXTURE4); // the shaders expect light volumes to be in texture 4
+		GlTextureUnit.T4.makeActive(); // the shaders expect light volumes to be in texture 4
 
 		if (Backend.getInstance().canUseVBOs()) {
 			ContraptionProgram structureShader = CreateContexts.STRUCTURE.getProgram(AllProgramSpecs.STRUCTURE);
@@ -134,7 +132,7 @@ public class ContraptionRenderDispatcher {
 			RenderLayer renderLayer = RenderLayer.fromRenderType(layer);
 			if (renderLayer != null) {
 				for (RenderedContraption renderer : RENDERERS.values()) {
-					renderer.materialManager.render(renderLayer, event.viewProjection, event.camX, event.camY, event.camZ, renderer::setup);
+					renderer.materialManager.render(renderLayer, event.viewProjection, event.camX, event.camY, event.camZ);
 				}
 			}
 		}
@@ -142,7 +140,7 @@ public class ContraptionRenderDispatcher {
 		glBindTexture(GL_TEXTURE_3D, 0);
 		layer.clearRenderState();
 		glDisable(GL_TEXTURE_3D);
-		glActiveTexture(GL_TEXTURE0);
+		GlTextureUnit.T0.makeActive();
 		glUseProgram(0);
 	}
 

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/render/RenderedContraption.java

@@ -13,6 +13,7 @@ import com.jozufozu.flywheel.backend.Backend;
 import com.jozufozu.flywheel.backend.gl.attrib.CommonAttributes;
 import com.jozufozu.flywheel.backend.gl.attrib.VertexFormat;
 import com.jozufozu.flywheel.backend.instancing.IInstanceRendered;
+import com.jozufozu.flywheel.backend.material.MaterialGroup;
 import com.jozufozu.flywheel.backend.material.MaterialManager;
 import com.jozufozu.flywheel.backend.model.ArrayModelRenderer;
 import com.jozufozu.flywheel.backend.model.BufferedModel;
@@ -60,7 +61,10 @@ public class RenderedContraption extends ContraptionWorldHolder {
 	public RenderedContraption(Contraption contraption, PlacementSimulationWorld renderWorld) {
 		super(contraption, renderWorld);
 		this.lighter = contraption.makeLighter();
-		this.materialManager = new MaterialManager<>(CreateContexts.CWORLD).setIgnoreOriginCoordinate(true);
+		this.materialManager = MaterialManager.builder(CreateContexts.CWORLD)
+				.setGroupFactory(ContraptionGroup.forContraption(this))
+				.setIgnoreOriginCoordinate(true)
+				.build();
 		this.kinetics = new ContraptionInstanceManager(this, materialManager);
 
 		buildLayers();