Greatly improve third-person camera behavior

changelog.md

@@ -1,18 +1,11 @@
-- Player camera now leans while their train is on a slope. [View issue.](https://github.com/der-fruhling-entertainment/create-train-perspective/issues/11)
-  - Also, camera now rolls when facing sideways on a slope.
-  - (hopefully this feature doesn't break other mods)
-- Player legs are now locked forward while seated on a train. [View issue.](https://github.com/der-fruhling-entertainment/create-train-perspective/issues/13)
-- Players standing on a train will now be affected the same way as players sitting. [View issue.](https://github.com/der-fruhling-entertainment/create-train-perspective/issues/14)
-  - This does not fix the Create mod issue where standing players may be ejected from the train if it is traveling at high speeds.
-- Players riding taller trains now lean correctly. [View issue.](https://github.com/der-fruhling-entertainment/create-train-perspective/issues/16)
 
 Known issues:
 - The mod's leaning is a bit jittery. [View issue.](https://github.com/der-fruhling-entertainment/create-train-perspective/issues/22)
   - This is probably more of a limitation of Minecraft itself. It might be fixable with a config option to emulate pitch, but that wouldn't make the player appear correctly to other players.
 - The easing back to normal posture after jumping off a train on a slope could use some work. [View issue.](https://github.com/der-fruhling-entertainment/create-train-perspective/issues/23)
 - The third-person camera is janky while on a train currently on a slope. [View issue.](https://github.com/der-fruhling-entertainment/create-train-perspective/issues/24)
 
-[View full change log.](https://github.com/der-fruhling/create-train-perspective/compare/v0.2.1...v0.2.2)
+[View full change log.](https://github.com/der-fruhling/create-train-perspective/compare/v0.2.2...v0.2.3)
 
 ---
 

common/src/main/java/net/derfruhling/minecraft/create/trainperspective/Camera3D.java

@@ -2,5 +2,4 @@
 
 public interface Camera3D {
     float getZRot();
-    void setRotation3D(float y, float x, float z);
 }

common/src/main/java/net/derfruhling/minecraft/create/trainperspective/mixin/CameraMixin.java

@@ -1,56 +1,45 @@
 package net.derfruhling.minecraft.create.trainperspective.mixin;
 
+import com.llamalad7.mixinextras.sugar.Local;
 import net.derfruhling.minecraft.create.trainperspective.Camera3D;
 import net.derfruhling.minecraft.create.trainperspective.Perspective;
 import net.minecraft.client.Camera;
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.player.LocalPlayer;
 import net.minecraft.util.Mth;
 import net.minecraft.world.entity.Entity;
-import org.joml.Quaternionf;
-import org.joml.Vector3f;
 import org.spongepowered.asm.mixin.*;
 import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.ModifyArg;
 import org.spongepowered.asm.mixin.injection.Redirect;
 
 @Mixin(Camera.class)
-@Implements({@Interface(iface = Camera3D.class, prefix = "ctp$")})
+@Implements({@Interface(iface = Camera3D.class, prefix = "c3d$")})
 public abstract class CameraMixin {
     @Shadow private Entity entity;
-    @Shadow private float xRot;
-    @Shadow private float yRot;
     @Unique private float ctp$zRot;
 
-    @Shadow @Final private Quaternionf rotation;
-    @Shadow @Final private Vector3f forwards;
-    @Shadow @Final private Vector3f up;
-    @Shadow @Final private Vector3f left;
-
     @Shadow protected abstract void setRotation(float f, float g);
 
-    @Unique
-    public void ctp$setRotation3D(float y, float x, float z) {
-        this.xRot = x;
-        this.yRot = y;
-        this.ctp$zRot = z;
-        this.rotation.rotationYXZ(-y * 0.017453292F, x * 0.017453292F, z * 0.017453292F);
-        this.forwards.set(0.0F, 0.0F, 1.0F).rotate(this.rotation);
-        this.up.set(0.0F, 1.0F, 0.0F).rotate(this.rotation);
-        this.left.set(1.0F, 0.0F, 0.0F).rotate(this.rotation);
+    @ModifyArg(method = "setRotation", at = @At(value = "INVOKE", target = "Lorg/joml/Quaternionf;rotationYXZ(FFF)Lorg/joml/Quaternionf;"), index = 2)
+    private float modifyRoll(float original) {
+        return original + ctp$zRot;
     }
 
     @Unique
-    public float ctp$getZRot() {
+    public float c3d$getZRot() {
         return this.ctp$zRot;
     }
 
     @Redirect(method = "setup", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/Camera;setRotation(FF)V"))
-    public void modifyRotationsPrimary(Camera instance, float y, float x) {
-        if(entity instanceof LocalPlayer player) {
+    public void modifyRotationsPrimary(Camera instance, float y, float x, @Local(argsOnly = true, ordinal = 1) boolean isThirdPerson) {
+        if(entity instanceof LocalPlayer player && !isThirdPerson) {
             var persp = (Perspective) Minecraft.getInstance().getEntityRenderDispatcher().getRenderer(player);
-            ctp$setRotation3D(y,
-                    x - persp.getLean() * Mth.sin((persp.getYaw() - y) * Mth.DEG_TO_RAD),
-                    persp.getLean() * Mth.cos((persp.getYaw() - y) * Mth.DEG_TO_RAD));
-        } else setRotation(y, x);
+            ctp$zRot = persp.getLean() * Mth.cos((persp.getYaw() - y) * Mth.DEG_TO_RAD);
+            setRotation(y, x - persp.getLean() * Mth.sin((persp.getYaw() - y) * Mth.DEG_TO_RAD));
+        } else {
+            ctp$zRot = 0;
+            setRotation(y, x);
+        }
     }
 }

common/src/main/java/net/derfruhling/minecraft/create/trainperspective/mixin/GameRendererMixin.java

@@ -16,7 +16,7 @@
 public class GameRendererMixin {
     @Shadow @Final private Camera mainCamera;
 
-    @Inject(method = "renderLevel", at = @At(value = "INVOKE", target = "Lcom/mojang/blaze3d/vertex/PoseStack;mulPose(Lorg/joml/Quaternionf;)V", ordinal = 3, shift = At.Shift.AFTER))
+    @Inject(method = "renderLevel", at = @At(value = "INVOKE", target = "Lcom/mojang/blaze3d/vertex/PoseStack;mulPose(Lorg/joml/Quaternionf;)V", ordinal = 2, shift = At.Shift.BEFORE))
     public void applyZRotation(float f, long l, PoseStack poseStack, CallbackInfo ci) {
         poseStack.mulPose(Axis.ZP.rotationDegrees(MixinUtil.asCamera3D(mainCamera).getZRot()));
     }