1 files changed, 133 insertions, 4 deletions

diff --git a/src/Physics/Explodinator.cpp b/src/Physics/Explodinator.cpp
index 4b0190ac8..862952fb9 100644
--- a/src/Physics/Explodinator.cpp
+++ b/src/Physics/Explodinator.cpp
@@ -39,12 +39,141 @@ namespace Explodinator
 		};
 	}
 
+	/** Returns how much of an explosion Destruction Lazor's (tm) intensity the given block attenuates.
+	Values are scaled as 0.3 * (0.3 + Wiki) since some compilers miss the constant folding optimisation.
+	Wiki values are https://minecraft.gamepedia.com/Explosion#Blast_resistance as of 2021-02-06. */
+	static float GetExplosionAbsorption(const BLOCKTYPE Block)
+	{
+		switch (Block)
+		{
+			case E_BLOCK_BEDROCK:
+			case E_BLOCK_COMMAND_BLOCK:
+			case E_BLOCK_END_GATEWAY:
+			case E_BLOCK_END_PORTAL:
+			case E_BLOCK_END_PORTAL_FRAME: return 1080000.09f;
+			case E_BLOCK_ANVIL:
+			case E_BLOCK_ENCHANTMENT_TABLE:
+			case E_BLOCK_OBSIDIAN: return 360.09f;
+			case E_BLOCK_ENDER_CHEST: return 180.09f;
+			case E_BLOCK_LAVA:
+			case E_BLOCK_STATIONARY_LAVA:
+			case E_BLOCK_WATER:
+			case E_BLOCK_STATIONARY_WATER: return 30.09f;
+			case E_BLOCK_DRAGON_EGG:
+			case E_BLOCK_END_STONE:
+			case E_BLOCK_END_BRICKS: return 2.79f;
+			case E_BLOCK_STONE:
+			case E_BLOCK_BLOCK_OF_COAL:
+			case E_BLOCK_DIAMOND_BLOCK:
+			case E_BLOCK_EMERALD_BLOCK:
+			case E_BLOCK_GOLD_BLOCK:
+			case E_BLOCK_IRON_BLOCK:
+			case E_BLOCK_BLOCK_OF_REDSTONE:
+			case E_BLOCK_BRICK:
+			case E_BLOCK_BRICK_STAIRS:
+			case E_BLOCK_COBBLESTONE:
+			case E_BLOCK_COBBLESTONE_STAIRS:
+			case E_BLOCK_IRON_BARS:
+			case E_BLOCK_JUKEBOX:
+			case E_BLOCK_MOSSY_COBBLESTONE:
+			case E_BLOCK_NETHER_BRICK:
+			case E_BLOCK_NETHER_BRICK_FENCE:
+			case E_BLOCK_NETHER_BRICK_STAIRS:
+			case E_BLOCK_PRISMARINE_BLOCK:
+			case E_BLOCK_STONE_BRICKS:
+			case E_BLOCK_STONE_BRICK_STAIRS:
+			case E_BLOCK_COBBLESTONE_WALL: return 1.89f;
+			case E_BLOCK_IRON_DOOR:
+			case E_BLOCK_IRON_TRAPDOOR:
+			case E_BLOCK_MOB_SPAWNER: return 1.59f;
+			case E_BLOCK_HOPPER: return 1.53f;
+			case E_BLOCK_TERRACOTTA: return 1.35f;
+			case E_BLOCK_COBWEB: return 1.29f;
+			case E_BLOCK_DISPENSER:
+			case E_BLOCK_DROPPER:
+			case E_BLOCK_FURNACE:
+			case E_BLOCK_OBSERVER: return 1.14f;
+			case E_BLOCK_BEACON:
+			case E_BLOCK_COAL_ORE:
+			case E_BLOCK_COCOA_POD:
+			case E_BLOCK_DIAMOND_ORE:
+			case E_BLOCK_EMERALD_ORE:
+			case E_BLOCK_GOLD_ORE:
+			case E_BLOCK_IRON_ORE:
+			case E_BLOCK_LAPIS_BLOCK:
+			case E_BLOCK_LAPIS_ORE:
+			case E_BLOCK_NETHER_QUARTZ_ORE:
+			case E_BLOCK_PLANKS:
+			case E_BLOCK_REDSTONE_ORE:
+			case E_BLOCK_FENCE:
+			case E_BLOCK_FENCE_GATE:
+			case E_BLOCK_WOODEN_DOOR:
+			case E_BLOCK_WOODEN_SLAB:
+			case E_BLOCK_WOODEN_STAIRS:
+			case E_BLOCK_TRAPDOOR: return 0.99f;
+			case E_BLOCK_CHEST:
+			case E_BLOCK_WORKBENCH:
+			case E_BLOCK_TRAPPED_CHEST: return 0.84f;
+			case E_BLOCK_BONE_BLOCK:
+			case E_BLOCK_CAULDRON:
+			case E_BLOCK_LOG: return 0.69f;  // nIcE
+			case E_BLOCK_CONCRETE: return 0.63f;
+			case E_BLOCK_BOOKCASE: return 0.54f;
+			case E_BLOCK_STANDING_BANNER:
+			case E_BLOCK_WALL_BANNER:
+			case E_BLOCK_JACK_O_LANTERN:
+			case E_BLOCK_MELON:
+			case E_BLOCK_HEAD:
+			case E_BLOCK_NETHER_WART_BLOCK:
+			case E_BLOCK_PUMPKIN:
+			case E_BLOCK_SIGN_POST:
+			case E_BLOCK_WALLSIGN: return 0.39f;
+			case E_BLOCK_QUARTZ_BLOCK:
+			case E_BLOCK_QUARTZ_STAIRS:
+			case E_BLOCK_RED_SANDSTONE:
+			case E_BLOCK_RED_SANDSTONE_STAIRS:
+			case E_BLOCK_SANDSTONE:
+			case E_BLOCK_SANDSTONE_STAIRS:
+			case E_BLOCK_WOOL: return 0.33f;
+			case E_BLOCK_SILVERFISH_EGG: return 0.315f;
+			case E_BLOCK_ACTIVATOR_RAIL:
+			case E_BLOCK_DETECTOR_RAIL:
+			case E_BLOCK_POWERED_RAIL:
+			case E_BLOCK_RAIL: return 0.3f;
+			case E_BLOCK_GRASS_PATH:
+			case E_BLOCK_CLAY:
+			case E_BLOCK_FARMLAND:
+			case E_BLOCK_GRASS:
+			case E_BLOCK_GRAVEL:
+			case E_BLOCK_SPONGE: return 0.27f;
+			case E_BLOCK_BREWING_STAND:
+			case E_BLOCK_STONE_BUTTON:
+			case E_BLOCK_WOODEN_BUTTON:
+			case E_BLOCK_CAKE:
+			case E_BLOCK_CONCRETE_POWDER:
+			case E_BLOCK_DIRT:
+			case E_BLOCK_FROSTED_ICE:
+			case E_BLOCK_HAY_BALE:
+			case E_BLOCK_ICE: return 0.24f;
+			default: return 0.09f;
+		}
+	}
+
 	/** Calculates the approximate percentage of an Entity's bounding box that is exposed to an explosion centred at Position. */
-	static float CalculateEntityExposure(cChunk & a_Chunk, const cEntity & a_Entity, const Vector3f a_Position, const int a_SquareRadius)
+	static float CalculateEntityExposure(const cChunk & a_Chunk, const cEntity & a_Entity, const Vector3f a_Position, const int a_SquareRadius)
 	{
+		class LineOfSightCallbacks final : public cLineBlockTracer::cCallbacks
+		{
+			virtual bool OnNextBlock(Vector3i a_BlockPos, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, eBlockFace a_EntryFace) override
+			{
+				return a_BlockType != E_BLOCK_AIR;
+			}
+		} Callback;
+
 		const Vector3d Position = a_Position;
 		unsigned Unobstructed = 0, Total = 0;
 		const auto Box = a_Entity.GetBoundingBox();
+		cLineBlockTracer Tracer(*a_Chunk.GetWorld(), Callback);
 
 		for (double X = Box.GetMinX(); X < Box.GetMaxX(); X += BoundingBoxStepUnit)
 		{
@@ -60,7 +189,7 @@ namespace Explodinator
 						continue;
 					}
 
-					if (cLineBlockTracer::LineOfSightTrace(*a_Chunk.GetWorld(), a_Position, Destination, cLineBlockTracer::eLineOfSight::losAir))
+					if (Tracer.Trace(a_Position, Destination))
 					{
 						Unobstructed++;
 					}
@@ -73,7 +202,7 @@ namespace Explodinator
 	}
 
 	/** Applies distance-based damage and knockback to all entities within the explosion's effect range. */
-	static void DamageEntities(cChunk & a_Chunk, const Vector3f a_Position, const int a_Power)
+	static void DamageEntities(const cChunk & a_Chunk, const Vector3f a_Position, const int a_Power)
 	{
 		const auto Radius = a_Power * 2;
 		const auto SquareRadius = Radius * Radius;
@@ -225,7 +354,7 @@ namespace Explodinator
 				break;
 			}
 
-			a_Intensity -= 0.3f * (0.3f + cBlockInfo::GetExplosionAbsorption(Neighbour->GetBlock(Position)));
+			a_Intensity -= GetExplosionAbsorption(Neighbour->GetBlock(Position));
 			if (a_Intensity <= 0)
 			{
 				// The ray is exhausted: