Add mind control overlay

src/main/java/electroblob/wizardry/client/ClientProxy.java

@@ -712,6 +712,7 @@ public class ClientProxy extends CommonProxy {
 	public void initialiseLayers(){
 		LayerTiledOverlay.initialiseLayers(LayerStone::new);
 		LayerTiledOverlay.initialiseLayers(LayerFrost::new);
+		LayerTiledOverlay.initialiseLayers(LayerMindControl::new);
 		LayerTiledOverlay.initialiseLayers(LayerSummonAnimation::new);
 		LayerTiledOverlay.initialiseLayers(LayerDisintegrateAnimation::new);
 	}

src/main/java/electroblob/wizardry/client/renderer/entity/layers/LayerMindControl.java

@@ -0,0 +1,59 @@
+package electroblob.wizardry.client.renderer.entity.layers;
+
+import electroblob.wizardry.Wizardry;
+import electroblob.wizardry.registry.WizardryPotions;
+import net.minecraft.client.renderer.GlStateManager;
+import net.minecraft.client.renderer.GlStateManager.DestFactor;
+import net.minecraft.client.renderer.GlStateManager.SourceFactor;
+import net.minecraft.client.renderer.entity.RenderLivingBase;
+import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.potion.PotionEffect;
+import net.minecraft.util.ResourceLocation;
+
+/**
+ * Layer used to render the mind control overlay on creatures with the mind control effect.
+ *
+ * @author Electroblob
+ * @since Wizardry 4.3
+ */
+public class LayerMindControl extends LayerTiledOverlay<EntityLivingBase> {
+
+	private static final ResourceLocation TEXTURE = new ResourceLocation(Wizardry.MODID, "textures/entity/mind_control_overlay.png");
+
+	public LayerMindControl(RenderLivingBase<?> renderer){
+		super(renderer);
+	}
+
+	@Override
+	public boolean shouldRender(EntityLivingBase entity, float partialTicks){
+		return !entity.isInvisible() && entity.isPotionActive(WizardryPotions.mind_control);
+	}
+
+	@Override
+	public ResourceLocation getTexture(EntityLivingBase entity, float partialTicks){
+		return TEXTURE;
+	}
+
+	@Override
+	public void doRenderLayer(EntityLivingBase entity, float limbSwing, float limbSwingAmount, float partialTicks,
+			float ageInTicks, float netHeadYaw, float headPitch, float scale){
+
+		GlStateManager.enableBlend();
+		GlStateManager.blendFunc(SourceFactor.SRC_ALPHA, DestFactor.ONE);
+
+		PotionEffect effect = entity.getActivePotionEffect(WizardryPotions.mind_control);
+		if(effect != null){
+			GlStateManager.color(1, 1, 1, Math.min(1, (effect.getDuration() - partialTicks) / 20));
+		}
+
+		super.doRenderLayer(entity, limbSwing, limbSwingAmount, partialTicks, ageInTicks, netHeadYaw, headPitch, scale);
+
+		GlStateManager.disableBlend();
+	}
+
+	@Override
+	protected void applyTextureSpaceTransformations(EntityLivingBase entity, float partialTicks){
+		float f = entity.ticksExisted + partialTicks;
+		GlStateManager.translate(f * 0.003f, f * 0.003f, 0);
+	}
+}

src/main/java/electroblob/wizardry/client/renderer/entity/layers/LayerTiledOverlay.java

@@ -82,6 +82,16 @@ public abstract class LayerTiledOverlay<T extends EntityLivingBase> implements L
 		return false; // Normally it looks kind of weird because second layers typically have holes in them
 	}
 
+	/**
+	 * Allows subclasses to perform additional transformations in the texture space before the model is rendered. This
+	 * can be used for a creeper-charge-like effect. To do this, simply override this method and call the appropriate
+	 * transformation method(s) (translate, rotate, scale) in {@link GlStateManager}. This method does nothing by
+	 * default.
+	 * @param entity The entity being rendered
+	 * @param partialTicks The current partial tick time
+	 */
+	protected void applyTextureSpaceTransformations(T entity, float partialTicks){}
+
 	@Override
 	public void doRenderLayer(T entity, float limbSwing, float limbSwingAmount, float partialTicks,
 			float ageInTicks, float netHeadYaw, float headPitch, float scale){
@@ -143,6 +153,8 @@ public abstract class LayerTiledOverlay<T extends EntityLivingBase> implements L
 
 		GlStateManager.scale(scaleX, scaleY, 1);
 
+		applyTextureSpaceTransformations(entity, partialTicks);
+
 		GlStateManager.matrixMode(GL11.GL_MODELVIEW); // Switch back to the 3D model space
 
 		boolean headWearHidden = false;