Fix view bobbing affecting Tracers while using shaders (#5964)

Author: noramibu

src/main/java/meteordevelopment/meteorclient/mixin/GameRendererMixin.java

@@ -9,6 +9,7 @@
 import com.llamalad7.mixinextras.injector.ModifyReturnValue;
 import com.llamalad7.mixinextras.sugar.Local;
 import com.mojang.blaze3d.systems.RenderSystem;
+import meteordevelopment.meteorclient.MixinPlugin;
 import meteordevelopment.meteorclient.MeteorClient;
 import meteordevelopment.meteorclient.events.render.GetFovEvent;
 import meteordevelopment.meteorclient.events.render.Render3DEvent;
@@ -121,21 +122,25 @@ private void onRenderWorld(RenderTickCounter tickCounter, CallbackInfo ci, @Loca
         if (depthRenderer == null) depthRenderer = new Renderer3D(MeteorRenderPipelines.WORLD_COLORED_LINES_DEPTH, MeteorRenderPipelines.WORLD_COLORED_DEPTH);
         Render3DEvent event = Render3DEvent.get(matrixStack, renderer, depthRenderer, tickDelta, camera.getCameraPos().x, camera.getCameraPos().y, camera.getCameraPos().z);
 
-        // Call utility classes
-
-        RenderUtils.updateScreenCenter(projection, position);
-        NametagUtils.onRender(position);
-
         // Update model view matrix
 
         RenderSystem.getModelViewStack().pushMatrix().mul(position);
 
         matrices.push();
         tiltViewWhenHurt(matrices, camera.getLastTickProgress());
-        if (client.options.getBobView().getValue()) bobView(matrices, camera.getLastTickProgress());
-        RenderSystem.getModelViewStack().mul(matrices.peek().getPositionMatrix().invert());
+        if (client.options.getBobView().getValue())
+            bobView(matrices, camera.getLastTickProgress());
+
+        Matrix4f inverseBob = new Matrix4f(matrices.peek().getPositionMatrix()).invert();
+        RenderSystem.getModelViewStack().mul(inverseBob);
         matrices.pop();
 
+        // Call utility classes (apply bob correction when Iris shaders are active)
+
+        Matrix4f correctedPosition = MixinPlugin.isIrisPresent && RenderUtils.isShaderPackInUse() ? new Matrix4f(position).mul(inverseBob) : position;
+        RenderUtils.updateScreenCenter(projection, correctedPosition);
+        NametagUtils.onRender(position);
+
         // Render
 
         renderer.begin();

src/main/java/meteordevelopment/meteorclient/utils/render/RenderUtils.java

@@ -14,6 +14,7 @@
 import meteordevelopment.meteorclient.utils.misc.Pool;
 import meteordevelopment.meteorclient.utils.render.color.Color;
 import meteordevelopment.orbit.EventHandler;
+import net.irisshaders.iris.api.v0.IrisApi;
 import net.minecraft.client.gui.DrawContext;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.math.BlockPos;
@@ -41,6 +42,10 @@ public static void init() {
         MeteorClient.EVENT_BUS.subscribe(RenderUtils.class);
     }
 
+    public static boolean isShaderPackInUse() {
+        return IrisApi.getInstance().isShaderPackInUse();
+    }
+
     // Items
     public static void drawItem(DrawContext drawContext, ItemStack itemStack, int x, int y, float scale, boolean overlay, String countOverride, boolean disableGuiScale) {
         Matrix3x2fStack matrices = drawContext.getMatrices();
@@ -165,4 +170,3 @@ public void render(Render3DEvent event) {
         }
     }
 }
-