First person magic (#56)

* Unicorns now levitate their items in first person

* Move the levitating item renderer out of being a singleton and add handling for bows and other special actions

src/main/java/com/minelittlepony/PonyRenderManager.java

@@ -7,6 +7,7 @@ import com.minelittlepony.mixin.MixinRenderManager;
 import com.minelittlepony.hdskins.gui.EntityPonyModel;
 import com.minelittlepony.hdskins.gui.RenderPonyModel;
 import com.minelittlepony.model.player.PlayerModels;
+import com.minelittlepony.render.LevitatingItemRenderer;
 import com.minelittlepony.render.player.RenderPonyPlayer;
 import com.minelittlepony.render.ponies.RenderPonyIllager;
 import com.minelittlepony.render.ponies.RenderPonyPigman;
@@ -42,6 +43,9 @@ import net.minecraft.entity.passive.EntityVillager;
  */
 public class PonyRenderManager {
 
+    private LevitatingItemRenderer magicRenderer = new LevitatingItemRenderer();
+
+
     private final Map<Class<? extends Entity>, Render<?>> renderMap = Maps.newHashMap();
 
     /**
@@ -149,4 +153,8 @@ public class PonyRenderManager {
             ModUtilities.addRenderer(type, (Render<T>)renderMap.get(type));
         }
     }
+
+    public LevitatingItemRenderer getMagicRenderer() {
+        return magicRenderer;
+    }
 }

src/main/java/com/minelittlepony/mixin/MixinItemRenderer.java

@@ -0,0 +1,32 @@
+package com.minelittlepony.mixin;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import com.minelittlepony.MineLittlePony;
+
+import net.minecraft.client.entity.AbstractClientPlayer;
+import net.minecraft.client.renderer.ItemRenderer;
+import net.minecraft.client.renderer.block.model.ItemCameraTransforms.TransformType;
+import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.item.ItemStack;
+
+@Mixin(ItemRenderer.class)
+public class MixinItemRenderer {
+
+    private static final String AbstractClientPlayer = "Lnet/minecraft/client/entity/AbstractClientPlayer;";
+    private static final String ItemStack = "Lnet/minecraft/item/ItemStack;";
+    private static final String EnumHand = "Lnet/minecraft/util/EnumHand;";
+    private static final String EntityLivingBase = "Lnet/minecraft/entity/EntityLivingBase;";
+    private static final String TransformType = "Lnet/minecraft/client/renderer/block/model/ItemCameraTransforms$TransformType;";
+
+    //public void renderItemInFirstPerson(AbstractClientPlayer player, float p_187457_2_, float p_187457_3_, EnumHand hand, float p_187457_5_, ItemStack stack, float p_187457_7_)
+    //public void renderItemSide(EntityLivingBase entitylivingbaseIn, ItemStack heldStack, ItemCameraTransforms.TransformType transform, boolean leftHanded)
+    @Redirect(method = "renderItemInFirstPerson(" + AbstractClientPlayer + "FF" + EnumHand + "F" + ItemStack + "F)V",
+             at = @At(value = "INVOKE",
+                      target = "Lnet/minecraft/client/renderer/ItemRenderer;renderItemSide(" + EntityLivingBase + ItemStack + TransformType + ")V"))
+    private void redirectRenderItemSide(ItemRenderer self, EntityLivingBase entity, ItemStack stack, TransformType transform, boolean left) {
+        MineLittlePony.getInstance().getRenderManager().getMagicRenderer().renderItemInFirstPerson(self, (AbstractClientPlayer)entity, stack, transform, left);
+    }
+}

src/main/java/com/minelittlepony/render/LevitatingItemRenderer.java

@@ -0,0 +1,142 @@
+package com.minelittlepony.render;
+
+import org.lwjgl.opengl.GL14;
+
+import com.minelittlepony.MineLittlePony;
+import com.minelittlepony.ducks.IRenderItem;
+import com.minelittlepony.pony.data.Pony;
+import com.minelittlepony.util.coordinates.Color;
+import com.mumfrey.liteloader.client.overlays.IMinecraft;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.entity.AbstractClientPlayer;
+import net.minecraft.client.renderer.ItemRenderer;
+import net.minecraft.client.renderer.RenderItem;
+import net.minecraft.client.renderer.block.model.ItemCameraTransforms.TransformType;
+import net.minecraft.entity.EntityLivingBase;
+import net.minecraft.item.EnumAction;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.EnumHandSide;
+import static net.minecraft.client.renderer.GlStateManager.*;
+
+public class LevitatingItemRenderer {
+
+    /**
+     * Renders a magical overlay over an item in third person.
+     */
+    public void renderItemGlow(EntityLivingBase entity, ItemStack drop, TransformType transform, EnumHandSide hand, int glowColor) {
+
+        // enchantments mess up the rendering
+        drop = stackWithoutEnchantment(drop);
+
+        pushMatrix();
+        disableLighting();
+        setColor(glowColor);
+
+        RenderItem renderItem = Minecraft.getMinecraft().getRenderItem();
+        ((IRenderItem) renderItem).useTransparency(true);
+
+        scale(1.1, 1.1, 1.1);
+
+        translate(0, 0.01F, 0.01F);
+        renderItem.renderItem(drop, entity, transform, hand == EnumHandSide.LEFT);
+        translate(0.01F, -0.01F, -0.02F);
+        renderItem.renderItem(drop, entity, transform, hand == EnumHandSide.LEFT);
+
+        ((IRenderItem) renderItem).useTransparency(false);
+        unsetColor();
+        enableLighting();
+        popMatrix();
+
+        // I hate rendering
+    }
+
+    private void setColor(int glowColor) {
+        GL14.glBlendColor(Color.r(glowColor), Color.g(glowColor), Color.b(glowColor), 0.2F);
+    }
+
+    private void unsetColor() {
+        GL14.glBlendColor(255, 255, 255, 1);
+    }
+
+    /**
+     * Renders an item in first person optionally with a magical overlay.
+     */
+    public void renderItemInFirstPerson(ItemRenderer renderer, AbstractClientPlayer entity, ItemStack stack, TransformType transform, boolean left) {
+
+        Pony pony = MineLittlePony.getInstance().getManager().getPony(entity);
+
+        pushMatrix();
+
+        boolean doMagic = pony.getMetadata().hasMagic();
+
+        if (doMagic) {
+            setupPerspective(entity, stack, left);
+        }
+
+        renderer.renderItemSide(entity, stack, transform, left);
+
+        if (doMagic) {
+
+            disableLighting();
+
+            IRenderItem renderItem = (IRenderItem)Minecraft.getMinecraft().getRenderItem();
+            renderItem.useTransparency(true);
+
+            setColor(pony.getMetadata().getGlowColor());
+
+            scale(1.1, 1.1, 1.1);
+
+            translate(0, 0.01F, 0.01F);
+            renderer.renderItemSide(entity, stack, transform, left);
+            translate(0.01F, -0.01F, -0.02F);
+            renderer.renderItemSide(entity, stack, transform, left);
+
+            renderItem.useTransparency(false);
+            unsetColor();
+            enableLighting();
+        }
+
+        popMatrix();
+
+        // I hate rendering
+    }
+
+    /**
+     * Moves held items to look like they're floating in the player's field.
+     */
+    private void setupPerspective(EntityLivingBase entity, ItemStack stack, boolean left) {
+        EnumAction action = stack.getItemUseAction();
+
+        boolean doNormal = entity.getItemInUseCount() <= 0 || action == EnumAction.NONE;
+        boolean doBow = doNormal && stack.getItemUseAction() == EnumAction.BOW;
+
+        if (doNormal) { // eating, blocking, and drinking are not transformed. Only held items.
+            float ticks = ((IMinecraft)Minecraft.getMinecraft()).getTimer().elapsedPartialTicks - entity.ticksExisted;
+
+            float floatAmount = (float)Math.sin(ticks / 9) / 40;
+            float driftAmount = (float)Math.cos(ticks / 10) / 40;
+
+            translate(driftAmount - floatAmount / 4, floatAmount, doBow ? -0.3F : -0.6F);
+
+            if (!doBow) { // bows have to point forwards
+                if (left) {
+                    rotate(-60, 0, 1, 0);
+                    rotate(30, 0, 0, 1);
+                } else {
+                    rotate(60, 0, 1, 0);
+                    rotate(-30, 0, 0, 1);
+                }
+            }
+        }
+    }
+
+    private ItemStack stackWithoutEnchantment(ItemStack original) {
+        if (original.isItemEnchanted()) {
+            original = original.copy();
+            original.getTagCompound().removeTag("ench");
+        }
+
+        return original;
+    }
+}

src/main/java/com/minelittlepony/render/layer/LayerHeldPonyItem.java

@@ -1,7 +1,8 @@
 package com.minelittlepony.render.layer;
 
-import com.minelittlepony.model.AbstractPonyModel;
 import com.minelittlepony.model.BodyPart;
+import com.minelittlepony.model.capabilities.IModel;
+
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.model.ModelBase;
 import net.minecraft.client.model.ModelBiped;
@@ -34,8 +35,8 @@ public class LayerHeldPonyItem<T extends EntityLivingBase> extends AbstractPonyL
             ModelBase model = getRenderer().getMainModel();
 
             pushMatrix();
-            if (model instanceof AbstractPonyModel) {
+            if (model instanceof IModel) {
-                ((AbstractPonyModel) model).transform(BodyPart.LEGS);
+                ((IModel) model).transform(BodyPart.LEGS);
             }
 
             if (model.isChild) {

src/main/java/com/minelittlepony/render/layer/LayerHeldPonyItemMagical.java

@@ -1,21 +1,8 @@
 package com.minelittlepony.render.layer;
 
-import static net.minecraft.client.renderer.GlStateManager.disableLighting;
+import com.minelittlepony.MineLittlePony;
-import static net.minecraft.client.renderer.GlStateManager.enableLighting;
-import static net.minecraft.client.renderer.GlStateManager.popMatrix;
-import static net.minecraft.client.renderer.GlStateManager.pushMatrix;
-import static net.minecraft.client.renderer.GlStateManager.scale;
-import static net.minecraft.client.renderer.GlStateManager.translate;
-
-import org.lwjgl.opengl.GL14;
-
-import com.minelittlepony.ducks.IRenderItem;
 import com.minelittlepony.model.capabilities.IModelUnicorn;
-import com.minelittlepony.util.coordinates.Color;
-
-import net.minecraft.client.Minecraft;
 import net.minecraft.client.renderer.GlStateManager;
-import net.minecraft.client.renderer.RenderItem;
 import net.minecraft.client.renderer.block.model.ItemCameraTransforms.TransformType;
 import net.minecraft.client.renderer.entity.RenderLivingBase;
 import net.minecraft.entity.EntityLivingBase;
@@ -44,7 +31,7 @@ public class LayerHeldPonyItemMagical<T extends EntityLivingBase> extends LayerH
     @Override
     protected void postItemRender(T entity, ItemStack drop, TransformType transform, EnumHandSide hand) {
         if (isUnicorn()) {
-            renderItemGlow(entity, drop, transform, hand, this.<IModelUnicorn>getPonyModel().getMagicColor());
+            MineLittlePony.getInstance().getRenderManager().getMagicRenderer().renderItemGlow(entity, drop, transform, hand, this.<IModelUnicorn>getPonyModel().getMagicColor());
         }
     }
 
@@ -56,39 +43,4 @@ public class LayerHeldPonyItemMagical<T extends EntityLivingBase> extends LayerH
             super.renderArm(side);
         }
     }
-
-    public void renderItemGlow(T entity, ItemStack drop, TransformType transform, EnumHandSide hand, int glowColor) {
-
-        // enchantments mess up the rendering
-        drop = stackWithoutEnchantment(drop);
-
-        pushMatrix();
-        disableLighting();
-
-        GL14.glBlendColor(Color.r(glowColor), Color.g(glowColor), Color.b(glowColor), 0.2F);
-
-        RenderItem renderItem = Minecraft.getMinecraft().getRenderItem();
-        ((IRenderItem) renderItem).useTransparency(true);
-
-        scale(1.1, 1.1, 1.1);
-
-        translate(0, 0.01F, 0.01F);
-        renderItem.renderItem(drop, entity, transform, hand == EnumHandSide.LEFT);
-        translate(0.01F, -0.01F, -0.02F);
-        renderItem.renderItem(drop, entity, transform, hand == EnumHandSide.LEFT);
-
-        ((IRenderItem) renderItem).useTransparency(false);
-        enableLighting();
-        popMatrix();
-
-        // I hate rendering
-    }
-
-    private ItemStack stackWithoutEnchantment(ItemStack original) {
-        if (original.isItemEnchanted()) {
-            original = original.copy();
-            original.getTagCompound().removeTag("ench");
-        }
-        return original;
-    }
 }

src/main/resources/minelp.mixin.json

@@ -8,6 +8,7 @@
         "MixinThreadDownloadImageData",
         "MixinNetworkPlayerInfo",
         "MixinRenderItem",
+        "MixinItemRenderer",
         "MixinRenderManager"
     ]
 }