Improved the ability icons and added separate icons for ability variations

src/main/java/com/minelittlepony/unicopia/ability/Ability.java

@@ -6,6 +6,7 @@ import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.ability.data.Hit;
 import com.minelittlepony.unicopia.entity.player.Pony;
 
+import net.minecraft.util.Identifier;
 import net.minecraft.world.World;
 
 public interface Ability<T extends Hit> {
@@ -47,6 +48,15 @@ public interface Ability<T extends Hit> {
 
     Hit.Serializer<T> getSerializer();
 
+    /**
+     * The icon representing this ability on the UI and HUD.
+     * @return
+     */
+    default Identifier getIcon(Pony player) {
+        Identifier id = Abilities.REGISTRY.getId(this);
+        return new Identifier(id.getNamespace(), "textures/gui/ability/" + id.getPath() + ".png");
+    }
+
     /**
      * Called to actually apply the ability.
      * Only called on the server side.

src/main/java/com/minelittlepony/unicopia/ability/AbilityDispatcher.java

@@ -178,7 +178,10 @@ public class AbilityDispatcher implements Tickable, NbtSerialisable {
 
         public Optional<Ability<?>> getAbility() {
             Race race = player.getSpecies();
-            return Abilities.BY_SLOT.computeIfAbsent(slot, c -> Collections.emptySet()).stream().filter(a -> a.canUse(race)).findFirst();
+            return Abilities.BY_SLOT.computeIfAbsent(slot, c -> Collections.emptySet())
+                    .stream()
+                    .filter(a -> a.canUse(race))
+                    .findFirst();
         }
 
         protected synchronized void setActiveAbility(Ability<?> power) {

src/main/java/com/minelittlepony/unicopia/ability/UnicornProjectileAbility.java

@@ -11,12 +11,23 @@ import com.minelittlepony.unicopia.ability.magic.spell.SpellRegistry;
 import com.minelittlepony.unicopia.entity.player.Pony;
 import com.minelittlepony.unicopia.particle.MagicParticleEffect;
 
+import net.minecraft.util.Identifier;
+
 /**
  * A magic casting ability for unicorns.
  * (only shields for now)
  */
 public class UnicornProjectileAbility implements Ability<Hit> {
 
+    /**
+     * The icon representing this ability on the UI and HUD.
+     */
+    @Override
+    public Identifier getIcon(Pony player) {
+        Identifier id = Abilities.REGISTRY.getId(this);
+        return new Identifier(id.getNamespace(), "textures/gui/ability/" + id.getPath() + (player.getEntity().isSneaking() ? "_focused" : "_unfocused") + ".png");
+    }
+
     @Override
     public int getWarmupTime(Pony player) {
         return 4;

src/main/java/com/minelittlepony/unicopia/ability/UnicornTeleportAbility.java

@@ -18,6 +18,7 @@ import net.minecraft.predicate.entity.EntityPredicates;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.sound.SoundCategory;
 import net.minecraft.sound.SoundEvents;
+import net.minecraft.util.Identifier;
 import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.hit.HitResult;
 import net.minecraft.util.math.BlockPos;
@@ -28,6 +29,16 @@ import net.minecraft.world.World;
  * Unicorn teleport ability
  */
 public class UnicornTeleportAbility implements Ability<Pos> {
+
+    /**
+     * The icon representing this ability on the UI and HUD.
+     */
+    @Override
+    public Identifier getIcon(Pony player) {
+        Identifier id = Abilities.REGISTRY.getId(this);
+        return new Identifier(id.getNamespace(), "textures/gui/ability/" + id.getPath() + (player.getEntity().isSneaking() ? "_far" : "_near") + ".png");
+    }
+
     @Override
     public int getWarmupTime(Pony player) {
         return 20;
@@ -39,8 +50,8 @@ public class UnicornTeleportAbility implements Ability<Pos> {
     }
 
     @Override
-    public boolean canUse(Race playerSpecies) {
-        return playerSpecies.canCast();
+    public boolean canUse(Race race) {
+        return race.canCast();
     }
 
     @Override

src/main/java/com/minelittlepony/unicopia/client/gui/UHud.java

@@ -3,7 +3,6 @@ package com.minelittlepony.unicopia.client.gui;
 import java.util.ArrayList;
 import java.util.List;
 
-import com.minelittlepony.unicopia.ability.Abilities;
 import com.minelittlepony.unicopia.ability.AbilityDispatcher;
 import com.minelittlepony.unicopia.ability.AbilitySlot;
 import com.minelittlepony.unicopia.entity.player.Pony;
@@ -67,11 +66,8 @@ public class UHud extends DrawableHelper {
 
     void renderAbilityIcon(MatrixStack matrices, AbilityDispatcher.Stat stat, int x, int y, int u, int v, int frameWidth, int frameHeight) {
         stat.getAbility().ifPresent(ability -> {
-            Identifier id = Abilities.REGISTRY.getId(ability);
-            client.getTextureManager().bindTexture(new Identifier(id.getNamespace(), "textures/gui/ability/" + id.getPath() + ".png"));
-
+            client.getTextureManager().bindTexture(ability.getIcon(Pony.of(client.player)));
             drawTexture(matrices, x, y, 0, 0, frameWidth, frameHeight, u, v);
-
             client.getTextureManager().bindTexture(HUD_TEXTURE);
         });
     }