honey collisions

src/main/java/de/bixilon/minosoft/data/player/LocalPlayerEntity.kt

@@ -44,6 +44,7 @@ import de.bixilon.minosoft.gui.rendering.util.VecUtil.chunkPosition
 import de.bixilon.minosoft.gui.rendering.util.VecUtil.clearZero
 import de.bixilon.minosoft.gui.rendering.util.VecUtil.empty
 import de.bixilon.minosoft.gui.rendering.util.VecUtil.get
+import de.bixilon.minosoft.gui.rendering.util.VecUtil.inChunkPosition
 import de.bixilon.minosoft.gui.rendering.util.VecUtil.plus
 import de.bixilon.minosoft.protocol.network.connection.PlayConnection
 import de.bixilon.minosoft.protocol.packets.c2s.play.*
@@ -355,6 +356,14 @@ class LocalPlayerEntity(
 
         // ToDo: Check for move effect
 
+        // block collision handling
+        val aabb = aabb.shrink(0.001)
+        for (blockPosition in aabb.blockPositions) {
+            val chunk = connection.world[blockPosition.chunkPosition] ?: continue
+            val blockState = chunk[blockPosition.inChunkPosition] ?: continue
+            blockState.block.onEntityCollision(connection, this, blockState, blockPosition)
+        }
+
         val velocityMultiplier = velocityMultiplier
         velocity.x *= velocityMultiplier
         velocity.z *= velocityMultiplier

src/main/java/de/bixilon/minosoft/data/registries/blocks/types/Block.kt

@@ -109,6 +109,8 @@ open class Block(
 
     open fun onEntityLand(connection: PlayConnection, entity: Entity, blockPosition: Vec3i, blockState: BlockState) {}
 
+    open fun onEntityCollision(connection: PlayConnection, entity: Entity, blockState: BlockState, blockPosition: Vec3i) {}
+
     companion object : ResourceLocationDeserializer<Block> {
         private val CONSTRUCTORS: Map<String, (resourceLocation: ResourceLocation, registries: Registries, data: JsonObject) -> Block> = mapOf(
             "FluidBlock" to { resourceLocation, registries, data -> FluidBlock(resourceLocation, registries, data) },
@@ -125,6 +127,7 @@ open class Block(
             "EnderChestBlock" to { resourceLocation, registries, data -> EnderChestBlock(resourceLocation, registries, data) },
             "NetherPortalBlock" to { resourceLocation, registries, data -> NetherPortalBlock(resourceLocation, registries, data) },
             "RedstoneTorchBlock" to { resourceLocation, registries, data -> RedstoneTorchBlock(resourceLocation, registries, data) },
+            "HoneyBlock" to { resourceLocation, registries, data -> HoneyBlock(resourceLocation, registries, data) },
         )
 
         override fun deserialize(registries: Registries?, resourceLocation: ResourceLocation, data: JsonObject): Block {

src/main/java/de/bixilon/minosoft/data/registries/blocks/types/HoneyBlock.kt

@@ -0,0 +1,50 @@
+/*
+ * Minosoft
+ * Copyright (C) 2021 Moritz Zwerger
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This software is not affiliated with Mojang AB, the original developer of Minecraft.
+ */
+
+package de.bixilon.minosoft.data.registries.blocks.types
+
+import com.google.gson.JsonObject
+import de.bixilon.minosoft.data.entities.entities.Entity
+import de.bixilon.minosoft.data.registries.ResourceLocation
+import de.bixilon.minosoft.data.registries.blocks.BlockState
+import de.bixilon.minosoft.data.registries.versions.Registries
+import de.bixilon.minosoft.protocol.network.connection.PlayConnection
+import glm_.vec3.Vec3i
+import kotlin.math.abs
+
+open class HoneyBlock(resourceLocation: ResourceLocation, registries: Registries, data: JsonObject) : Block(resourceLocation, registries, data) {
+
+    override fun onEntityCollision(connection: PlayConnection, entity: Entity, blockState: BlockState, blockPosition: Vec3i) {
+        super.onEntityCollision(connection, entity, blockState, blockPosition)
+
+        if (isSliding(entity, blockPosition)) {
+            if (entity.velocity.y < -0.13) {
+                val horizontalMultiplier = -0.05 / entity.velocity.y
+                entity.velocity.x *= horizontalMultiplier
+                entity.velocity.z *= horizontalMultiplier
+            }
+            entity.velocity.y = -0.05
+        }
+    }
+
+    private fun isSliding(entity: Entity, blockPosition: Vec3i): Boolean {
+        if (entity.onGround || (entity.position.y > blockPosition.y + 0.9375 - 1.0E-7) || entity.velocity.y >= -0.08) {
+            return false
+        }
+        val x = abs(blockPosition.x + 0.5 - entity.position.x) + 1.0E-7
+        val z = abs(blockPosition.z + 0.5 - entity.position.z) + 1.0E-7
+        val minSize = 0.4375 + (entity.dimensions.x / 2.0)
+        return x > minSize || z > minSize
+    }
+}
+

src/main/java/de/bixilon/minosoft/gui/rendering/chunk/models/AABB.kt

@@ -109,8 +109,8 @@ class AABB(
         return this extend direction.vector
     }
 
-    infix fun grow(value: Double): AABB {
-        return AABB(min - value, max + value)
+    infix fun grow(size: Double): AABB {
+        return AABB(min - size, max + size)
     }
 
     fun computeOffset(other: AABB, offset: Double, axis: Axes): Double {