From c37d91e476be0f39abe3aa4cb7a8abad9a781804 Mon Sep 17 00:00:00 2001
From: embeddedt <42941056+embeddedt@users.noreply.github.com>
Date: Sun, 26 Mar 2023 09:17:03 -0400
Subject: [PATCH] Avoid fetching key state on background threads

---
 .../perf/async_jei/InputConstantsMixin.java   | 19 +++++++++++++++++++
 src/main/resources/modernfix.mixins.json      |  1 +
 2 files changed, 20 insertions(+)
 create mode 100644 src/main/java/org/embeddedt/modernfix/mixin/perf/async_jei/InputConstantsMixin.java

diff --git a/src/main/java/org/embeddedt/modernfix/mixin/perf/async_jei/InputConstantsMixin.java b/src/main/java/org/embeddedt/modernfix/mixin/perf/async_jei/InputConstantsMixin.java
new file mode 100644
index 00000000..add53d70
--- /dev/null
+++ b/src/main/java/org/embeddedt/modernfix/mixin/perf/async_jei/InputConstantsMixin.java
@@ -0,0 +1,19 @@
+package org.embeddedt.modernfix.mixin.perf.async_jei;
+
+import com.mojang.blaze3d.platform.InputConstants;
+import com.mojang.blaze3d.systems.RenderSystem;
+import org.lwjgl.glfw.GLFW;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(InputConstants.class)
+public class InputConstantsMixin {
+    @Redirect(method = "isKeyDown", at = @At(value = "INVOKE", target = "Lorg/lwjgl/glfw/GLFW;glfwGetKey(JI)I"))
+    private static int offThreadKeyFetch(long win, int k) {
+        if(RenderSystem.isOnRenderThreadOrInit())
+            return GLFW.glfwGetKey(win, k);
+        else
+            return 0;
+    }
+}
diff --git a/src/main/resources/modernfix.mixins.json b/src/main/resources/modernfix.mixins.json
index f90ed5ce..9833178c 100644
--- a/src/main/resources/modernfix.mixins.json
+++ b/src/main/resources/modernfix.mixins.json
@@ -73,6 +73,7 @@
     "perf.parallelize_model_loading.TransformationMatrixMixin",
     "perf.parallelize_model_loading.BooleanPropertyMixin",
     "perf.parallelize_model_loading.PropertyMixin",
+    "perf.async_jei.InputConstantsMixin",
     "perf.async_jei.IngredientListElementFactoryMixin",
     "perf.async_jei.ClientLifecycleHandlerMixin",
     "perf.async_jei.JeiStarterMixin",