Implementation of A more useful Lava Boiler (#1814)

* Fix Missing null/empty checks on boilers base class

Would cause a deadlock on empty boilers unable to start,
as it tried to transfer null or empty FuildStack.

* Fix Sound coordinates so it can be centered on block

* WIP Lava Boiler Improuvements

* :spotlessapply

* Add GUI slot block background textures

* Restrict ash slot to remove items only (disallow inserting items there)

* Finalize GUI and Obsidian Production mechanic

* Fix still output Obisidian from cooled Lava even when no more Lava available

* Lava Boiler Textures: Improves GUI and TOP

- Fluid slot now has Steam themed textures
- Item slot block background gets a smaller icon that hides behind
actual item blocks
- Boiler TOP is now a drain texture instead of pump

* Add null check

2 files changed, 4 insertions, 0 deletions

diff --git a/src/main/java/gregtech/api/gui/modularui/GT_UITextures.java b/src/main/java/gregtech/api/gui/modularui/GT_UITextures.java
index 4b6030fa19..a1d1be02ac 100644
--- a/src/main/java/gregtech/api/gui/modularui/GT_UITextures.java
+++ b/src/main/java/gregtech/api/gui/modularui/GT_UITextures.java
@@ -25,6 +25,7 @@ public class GT_UITextures {
             .of(MODID, "gui/background/text_field_light_gray", 61, 12, 1);
 
     public static final SteamTexture SLOT_ITEM_STEAM = SteamTexture.fullImage(MODID, "gui/slot/item_%s");
+    public static final SteamTexture SLOT_FLUID_STEAM = SteamTexture.fullImage(MODID, "gui/slot/fluid_%s");
     public static final AdaptableUITexture SLOT_DARK_GRAY = AdaptableUITexture
             .of(MODID, "gui/slot/dark_gray", 18, 18, 1);
     public static final AdaptableUITexture SLOT_MAINTENANCE = AdaptableUITexture
@@ -68,6 +69,8 @@ public class GT_UITextures {
     public static final UITexture OVERLAY_SLOT_DUST = UITexture.fullImage(MODID, "gui/overlay_slot/dust");
     public static final SteamTexture OVERLAY_SLOT_DUST_STEAM = SteamTexture
             .fullImage(MODID, "gui/overlay_slot/dust_%s");
+    public static final SteamTexture OVERLAY_SLOT_BLOCK_STEAM = SteamTexture
+            .fullImage(MODID, "gui/overlay_slot/block_%s");
     public static final UITexture OVERLAY_SLOT_EXPLOSIVE = UITexture.fullImage(MODID, "gui/overlay_slot/explosive");
     public static final UITexture OVERLAY_SLOT_EXTRUDER_SHAPE = UITexture
             .fullImage(MODID, "gui/overlay_slot/extruder_shape");
diff --git a/src/main/java/gregtech/api/gui/modularui/GUITextureSet.java b/src/main/java/gregtech/api/gui/modularui/GUITextureSet.java
index 1bacff886a..8b6e9f85ec 100644
--- a/src/main/java/gregtech/api/gui/modularui/GUITextureSet.java
+++ b/src/main/java/gregtech/api/gui/modularui/GUITextureSet.java
@@ -41,6 +41,7 @@ public class GUITextureSet {
     public static final Function<SteamVariant, GUITextureSet> STEAM = steamVariant -> new GUITextureSet()
             .setMainBackground(GT_UITextures.BACKGROUND_STEAM.get(steamVariant))
             .setItemSlot(GT_UITextures.SLOT_ITEM_STEAM.get(steamVariant))
+            .setFluidSlot(GT_UITextures.SLOT_FLUID_STEAM.get(steamVariant))
             .setCoverTab(
                     GT_UITextures.TAB_COVER_STEAM_NORMAL.get(steamVariant),
                     GT_UITextures.TAB_COVER_STEAM_HIGHLIGHT.get(steamVariant),