Add chunk memory stats debug entry

Author: xCollateral

src/main/java/net/vulkanmod/mixin/debug/DebugScreenEntriesM.java

@@ -0,0 +1,25 @@
+package net.vulkanmod.mixin.debug;
+
+import net.minecraft.client.gui.components.debug.DebugScreenEntries;
+import net.minecraft.client.gui.components.debug.DebugScreenEntry;
+import net.minecraft.resources.ResourceLocation;
+import net.vulkanmod.render.profiling.DebugEntryMemoryStats;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(DebugScreenEntries.class)
+public abstract class DebugScreenEntriesM {
+
+    @Shadow
+    public static ResourceLocation register(ResourceLocation resourceLocation, DebugScreenEntry debugScreenEntry) {
+        return null;
+    }
+
+    @Inject(method = "<clinit>", at = @At("RETURN"))
+    private static void addEntry(CallbackInfo ci) {
+        register(ResourceLocation.fromNamespaceAndPath("vkmod","stats"), new DebugEntryMemoryStats());
+    }
+}

src/main/java/net/vulkanmod/render/chunk/WorldRenderer.java

@@ -508,6 +508,8 @@ public SectionGrid getSectionGrid() {
     }
 
     public ChunkAreaManager getChunkAreaManager() {
+        if (this.sectionGrid == null)
+            return null;
         return this.sectionGrid.chunkAreaManager;
     }
 

src/main/java/net/vulkanmod/render/profiling/DebugEntryMemoryStats.java

@@ -0,0 +1,28 @@
+package net.vulkanmod.render.profiling;
+
+import net.minecraft.client.gui.components.debug.DebugScreenDisplayer;
+import net.minecraft.client.gui.components.debug.DebugScreenEntry;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.chunk.LevelChunk;
+import net.vulkanmod.render.chunk.WorldRenderer;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+public class DebugEntryMemoryStats implements DebugScreenEntry {
+    private static final ResourceLocation GROUP = ResourceLocation.withDefaultNamespace("vk_memory");
+
+    @Override
+    public void display(DebugScreenDisplayer debugScreenDisplayer, @Nullable Level level,
+                        @Nullable LevelChunk levelChunk, @Nullable LevelChunk levelChunk2) {
+        var chunkAreaManager = WorldRenderer.getInstance().getChunkAreaManager();
+
+        if (chunkAreaManager != null) {
+            debugScreenDisplayer.addToGroup(
+                    GROUP,
+                    List.of(chunkAreaManager.getStats())
+            );
+        }
+    }
+}

src/main/resources/vulkanmod.mixins.json

@@ -26,6 +26,7 @@
 
     "debug.crash_report.SystemReportM",
     "debug.DebugEntryMemoryM",
+    "debug.DebugScreenEntriesM",
     "debug.KeyboardHandlerM",
 
     "matrix.Matrix4fM",