synchronization and persistant state

src/main/kotlin/org/neoflock/neocomputers/gui/screen/CombustionGeneratorScreen.kt

@@ -1,16 +1,21 @@
 package org.neoflock.neocomputers.gui.screen
 
 import net.minecraft.client.gui.GuiGraphics
+import net.minecraft.network.FriendlyByteBuf
+import net.minecraft.network.RegistryFriendlyByteBuf
 import net.minecraft.network.chat.Component
 import net.minecraft.resources.ResourceLocation
 import net.minecraft.world.entity.player.Inventory
-import org.neoflock.neocomputers.NeoComputers
+import org.neoflock.neocomputers.entity.BlockEntities
 import org.neoflock.neocomputers.gui.menu.CombustionGeneratorMenu
 import org.neoflock.neocomputers.utils.GenericContainerScreen
 
 class CombustionGeneratorScreen(abstractContainerMenu: CombustionGeneratorMenu, inventory: Inventory, component: Component) : GenericContainerScreen<CombustionGeneratorMenu>(abstractContainerMenu, inventory, component) {
     override fun findMenuTexture(): ResourceLocation = ResourceLocation.withDefaultNamespace("textures/gui/container/dispenser.png")
 
+    var energy: Long = 0
+    var energyCapacity: Long = 1
+
     override fun render(graphics: GuiGraphics, mouseX: Int, mouseY: Int, something: Float) {
         super.render(graphics, mouseX, mouseY, something)
 
@@ -21,9 +26,16 @@ class CombustionGeneratorScreen(abstractContainerMenu: CombustionGeneratorMenu,
         val lineY = imageY + 6
         val lineHeight = 60
 
-        val power = 0.2
+        val power = energy.toDouble() / energyCapacity
 
         graphics.fill(lineX, lineY, lineX + 2, lineY + lineHeight, lineFg)
         graphics.fill(lineX, lineY, lineX + 2, lineY + (lineHeight * (1.0 - power)).toInt(), lineBg)
     }
+
+    override fun getBoundBlockEntityType() = setOf(BlockEntities.COMBUSTGEN_ENTITY.get())
+
+    override fun processScreenStatePacket(buf: FriendlyByteBuf) {
+        energy = buf.readLong()
+        energyCapacity = buf.readLong()
+    }
 }