Add cfps command

src/main/java/net/earthcomputer/clientcommands/ClientCommands.java

@@ -151,6 +151,7 @@ public static void registerCommands(CommandDispatcher<FabricClientCommandSource>
         FindItemCommand.register(dispatcher, context);
         FishCommand.register(dispatcher, context);
         FovCommand.register(dispatcher);
+        FramerateCommand.register(dispatcher);
         GammaCommand.register(dispatcher);
         GetDataCommand.register(dispatcher);
         GhostBlockCommand.register(dispatcher, context);

src/main/java/net/earthcomputer/clientcommands/command/FramerateCommand.java

@@ -0,0 +1,50 @@
+package net.earthcomputer.clientcommands.command;
+
+import com.mojang.brigadier.CommandDispatcher;
+import net.fabricmc.fabric.api.client.command.v2.FabricClientCommandSource;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.Options;
+import net.minecraft.network.chat.Component;
+
+import java.util.function.IntSupplier;
+
+import static com.mojang.brigadier.arguments.IntegerArgumentType.*;
+import static net.fabricmc.fabric.api.client.command.v2.ClientCommandManager.*;
+
+public class FramerateCommand {
+
+    public static final IntSupplier MAX_REFRESH_RATE = () -> Math.max(Options.UNLIMITED_FRAMERATE_CUTOFF, Minecraft.getInstance().virtualScreen.screenManager.monitors.values().stream()
+        .mapToInt(monitor -> monitor.getCurrentMode().getRefreshRate())
+        .max().orElseThrow());
+
+    public static void register(CommandDispatcher<FabricClientCommandSource> dispatcher) {
+        dispatcher.register(literal("cfps")
+            .executes(ctx -> getMaxFps(ctx.getSource()))
+            .then(argument("maxfps", integer(1))
+                .suggests((context, builder) -> builder.suggest(MAX_REFRESH_RATE.getAsInt()).buildFuture())
+                .executes(ctx -> setMaxFps(ctx.getSource(), getInteger(ctx, "maxfps"))))
+            .then(literal("unlimited")
+                .executes(ctx -> setMaxFps(ctx.getSource(), MAX_REFRESH_RATE.getAsInt() + 1))));
+    }
+
+    private static int getMaxFps(FabricClientCommandSource source) {
+        int framerateLimit = source.getClient().getFramerateLimitTracker().getFramerateLimit();
+        if (framerateLimit > MAX_REFRESH_RATE.getAsInt()) {
+            source.sendFeedback(Component.translatable("commands.cfps.getMaxFps.unlimited"));
+        } else {
+            source.sendFeedback(Component.translatable("commands.cfps.getMaxFps", framerateLimit));
+        }
+        return framerateLimit;
+    }
+
+    private static int setMaxFps(FabricClientCommandSource source, int maxFps) {
+        source.getClient().getFramerateLimitTracker().setFramerateLimit(maxFps);
+        int maxRefreshRate = MAX_REFRESH_RATE.getAsInt();
+        if (maxFps > maxRefreshRate) {
+            source.sendFeedback(Component.translatable("commands.cfps.setMaxFps.unlimited"));
+        } else {
+            source.sendFeedback(Component.translatable("commands.cfps.setMaxFps.success", maxFps));
+        }
+        return maxFps;
+    }
+}

src/main/java/net/earthcomputer/clientcommands/mixin/commands/fps/MinecraftMixin.java

@@ -0,0 +1,16 @@
+package net.earthcomputer.clientcommands.mixin.commands.fps;
+
+import net.earthcomputer.clientcommands.command.FramerateCommand;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.Options;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.Constant;
+import org.spongepowered.asm.mixin.injection.ModifyConstant;
+
+@Mixin(Minecraft.class)
+public class MinecraftMixin {
+    @ModifyConstant(method = "runTick", constant = @Constant(intValue = Options.UNLIMITED_FRAMERATE_CUTOFF))
+    private int changeCutoff(int original) {
+        return FramerateCommand.MAX_REFRESH_RATE.getAsInt() + 1;
+    }
+}

src/main/resources/assets/clientcommands/lang/en_us.json

@@ -129,6 +129,11 @@
 
   "commands.cfov.success": "Set FOV to %s",
 
+  "commands.cfps.getMaxFps": "FPS is capped at %s",
+  "commands.cfps.getMaxFps.unlimited": "FPS is unlimited",
+  "commands.cfps.setMaxFps.success": "Set max FPS to %s",
+  "commands.cfps.setMaxFps.unlimited": "Set max FPS to unlimited",
+
   "commands.cfunction.limitReached": "Command limit (%s) reached",
   "commands.cfunction.success": "Ran %s commands from function %s",
 

src/main/resources/clientcommands.aw

@@ -17,6 +17,11 @@ accessible method net/minecraft/world/level/block/ShulkerBoxBlock canOpen (Lnet/
 # cfish
 accessible method net/minecraft/world/entity/projectile/FishingHook canHitEntity (Lnet/minecraft/world/entity/Entity;)Z
 
+# cfps
+accessible field net/minecraft/client/Minecraft virtualScreen Lnet/minecraft/client/renderer/VirtualScreen;
+accessible field net/minecraft/client/renderer/VirtualScreen screenManager Lcom/mojang/blaze3d/platform/ScreenManager;
+accessible field com/mojang/blaze3d/platform/ScreenManager monitors Lit/unimi/dsi/fastutil/longs/Long2ObjectMap;
+
 # cgive
 accessible method net/minecraft/world/entity/player/Inventory addResource (ILnet/minecraft/world/item/ItemStack;)I
 accessible method net/minecraft/world/entity/player/Inventory hasRemainingSpaceForItem (Lnet/minecraft/world/item/ItemStack;Lnet/minecraft/world/item/ItemStack;)Z

src/main/resources/mixins.clientcommands.json

@@ -68,6 +68,7 @@
     "commands.alias.ClientSuggestionProviderMixin",
     "commands.enchant.MultiPlayerGameModeMixin",
     "commands.findblock.ClientLevelMixin",
+    "commands.fps.MinecraftMixin",
     "commands.generic.CommandSuggestionsMixin",
     "commands.glow.LivingEntityRenderStateMixin",
     "commands.reply.ClientPacketListenerMixin",