more physics stuff

Cargo.lock

@@ -183,6 +183,7 @@ dependencies = [
 name = "azalea-physics"
 version = "0.1.0"
 dependencies = [
+ "azalea-block",
  "azalea-core",
  "azalea-entity",
  "azalea-world",

azalea-block/src/lib.rs

@@ -8,7 +8,7 @@ use std::mem;
 
 impl BlockState {
     /// Transmutes a u32 to a block state.
-    /// 
+    ///
     /// # Safety
     /// The `state_id` should be a valid block state.
     #[inline]

azalea-core/src/cursor3d.rs

@@ -1,3 +1,5 @@
+use crate::BlockPos;
+
 pub struct Cursor3d {
     index: usize,
 
@@ -37,15 +39,18 @@ impl Iterator for Cursor3d {
         }
 
         Some(CursorIteration {
-            x: self.origin_x + x as i32,
-            y: self.origin_y + y as i32,
-            z: self.origin_z + z as i32,
+            pos: BlockPos {
+                x: self.origin_x + x as i32,
+                y: self.origin_y + y as i32,
+                z: self.origin_z + z as i32,
+            },
             iteration_type: iteration_type.into(),
         })
     }
 }
 
 #[repr(u8)]
+#[derive(Eq, PartialEq, Debug)]
 pub enum CursorIterationType {
     Inside = 0,
     Face = 1,
@@ -54,9 +59,7 @@ pub enum CursorIterationType {
 }
 
 pub struct CursorIteration {
-    pub x: i32,
-    pub y: i32,
-    pub z: i32,
+    pub pos: BlockPos,
     pub iteration_type: CursorIterationType,
 }
 

azalea-core/src/position.rs

@@ -134,6 +134,9 @@ impl ChunkSectionPos {
     pub fn new(x: i32, y: i32, z: i32) -> Self {
         ChunkSectionPos { x, y, z }
     }
+    pub fn block_to_section_coord(block: i32) -> i32 {
+        block >> 4
+    }
 }
 /// The coordinates of a block inside a chunk.
 #[derive(Clone, Copy, Debug, Default, PartialEq)]

azalea-entity/src/lib.rs

@@ -1,5 +1,4 @@
 mod data;
-mod physics;
 
 use azalea_core::{PositionDelta, Vec3};
 pub use data::*;

azalea-physics/Cargo.toml

@@ -6,6 +6,7 @@ version = "0.1.0"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+azalea-block = {path = "../azalea-block"}
 azalea-core = {path = "../azalea-core"}
 azalea-entity = {path = "../azalea-entity"}
 azalea-world = {path = "../azalea-world"}

azalea-physics/README.md

@@ -0,0 +1,3 @@
+# Azalea Physics
+
+Physics for Minecraft entities.

azalea-physics/src/aabb.rs

@@ -15,7 +15,7 @@ pub struct AABB {
 }
 
 impl AABB {
-    pub fn contract(&mut self, x: f64, y: f64, z: f64) -> AABB {
+    pub fn contract(&self, x: f64, y: f64, z: f64) -> AABB {
         let mut min_x = self.min_x;
         let mut min_y = self.min_y;
         let mut min_z = self.min_z;
@@ -53,7 +53,7 @@ impl AABB {
         }
     }
 
-    pub fn expand_towards(&mut self, other: &Vec3) -> AABB {
+    pub fn expand_towards(&self, other: &Vec3) -> AABB {
         let mut min_x = self.min_x;
         let mut min_y = self.min_y;
         let mut min_z = self.min_z;
@@ -91,7 +91,7 @@ impl AABB {
         }
     }
 
-    pub fn inflate(&mut self, x: f64, y: f64, z: f64) -> AABB {
+    pub fn inflate(&self, x: f64, y: f64, z: f64) -> AABB {
         let min_x = self.min_x - x;
         let min_y = self.min_y - y;
         let min_z = self.min_z - z;

azalea-physics/src/dimension_collisions.rs

@@ -1,9 +1,11 @@
+use crate::{aabb::EPSILON, AABB};
+use azalea_block::{Block, BlockState};
+use azalea_core::{ChunkPos, ChunkSectionPos, Cursor3d, CursorIterationType};
 use azalea_entity::Entity;
-use azalea_world::Dimension;
+use azalea_world::{Chunk, Dimension};
+use std::sync::{Arc, Mutex};
 
-use crate::AABB;
-
-trait CollisionGetter {
+pub trait CollisionGetter {
     fn get_block_collisions<'a>(
         &'a self,
         entity: Option<&Entity>,
@@ -25,23 +27,103 @@ pub struct BlockCollisions<'a> {
     dimension: &'a Dimension,
     // context: CollisionContext,
     aabb: AABB,
+
+    cursor: Cursor3d,
+    only_suffocating_blocks: bool,
 }
 
 impl<'a> BlockCollisions<'a> {
     pub fn new(dimension: &'a Dimension, entity: Option<&Entity>, aabb: AABB) -> Self {
-        Self { dimension, aabb }
+        let origin_x = (aabb.min_x - EPSILON) as i32 - 1;
+        let origin_y = (aabb.max_x + EPSILON) as i32 + 1;
+        let origin_z = (aabb.min_y - EPSILON) as i32 - 1;
+
+        let end_x = (aabb.max_y + EPSILON) as i32 + 1;
+        let end_y = (aabb.min_z - EPSILON) as i32 - 1;
+        let end_z = (aabb.max_z + EPSILON) as i32 + 1;
+
+        let cursor = Cursor3d::new(origin_x, origin_y, origin_z, end_x, end_y, end_z);
+
+        Self {
+            dimension,
+            aabb,
+            cursor,
+            only_suffocating_blocks: false,
+        }
+    }
+
+    fn get_chunk(&self, block_x: i32, block_z: i32) -> Option<&Arc<Mutex<Chunk>>> {
+        let chunk_x = ChunkSectionPos::block_to_section_coord(block_x);
+        let chunk_z = ChunkSectionPos::block_to_section_coord(block_z);
+        let chunk_pos = ChunkPos::new(chunk_x, chunk_z);
+
+        // TODO: minecraft caches chunk here
+        // int chunkX = SectionPos.blockToSectionCoord(blockX);
+        // int chunkZ = SectionPos.blockToSectionCoord(blockZ);
+        // long chunkPosLong = ChunkPos.asLong(chunkX, chunkZ);
+        // if (this.cachedBlockGetter != null && this.cachedBlockGetterPos == var5) {
+        //    return this.cachedBlockGetter;
+        // } else {
+        //    BlockGetter var7 = this.collisionGetter.getChunkForCollisions(chunkX, chunkZ);
+        //    this.cachedBlockGetter = var7;
+        //    this.cachedBlockGetterPos = chunkPosLong;
+        //    return var7;
+        // }
+
+        let chunk = self.dimension[&chunk_pos].as_ref();
+        return chunk;
     }
 }
 
-impl Iterator for BlockCollisions<'a> {
+impl<'a> Iterator for BlockCollisions<'a> {
     type Item = VoxelShape;
 
     fn next(&mut self) -> Option<Self::Item> {
-        loop {
-            if !self.cursor.advance() {
-                return None;
+        while let Some(item) = self.cursor.next() {
+            if item.iteration_type == CursorIterationType::Corner {
+                continue;
             }
+
+            let chunk = self.get_chunk(item.pos.x, item.pos.z);
+            let chunk = match chunk {
+                Some(chunk) => chunk,
+                None => continue,
+            };
+            let chunk_lock = chunk.lock().unwrap();
+
+            let pos = item.pos;
+            let block_state: BlockState = chunk_lock.get(&(&pos).into(), self.dimension.min_y());
+            let block: &dyn Block = &block_state.into();
+
+            // TODO: continue if self.only_suffocating_blocks and the block is not suffocating
+
+            let block_shape = VoxelShape {};
+            // let block_shape = block.get_collision_shape();
+            // if block_shape == Shapes::block() {
+            if true {
+                if !self.aabb.intersects_aabb(&AABB {
+                    min_x: item.pos.x as f64,
+                    min_y: item.pos.y as f64,
+                    min_z: item.pos.z as f64,
+                    max_x: (item.pos.x + 1) as f64,
+                    max_y: (item.pos.y + 1) as f64,
+                    max_z: (item.pos.z + 1) as f64,
+                }) {
+                    continue;
+                }
+
+                return block_shape.move_relative(item.pos.x, item.pos.y, item.pos.z);
+            }
+
+            // let block_shape = block_shape.move_relative(item.pos.x, item.pos.y, item.pos.z);
+            // if (!Shapes.joinIsNotEmpty(block_shape, this.entityShape, BooleanOp.AND)) {
+            //     continue;
+            // }
+
+            // return block_shape;
         }
+
+        None
     }
 }
 

azalea-physics/src/lib.rs

@@ -7,6 +7,7 @@ use azalea_core::{PositionDelta, PositionXYZ, Vec3};
 use azalea_entity::Entity;
 use azalea_world::Dimension;
 pub use block_hit_result::BlockHitResult;
+use dimension_collisions::CollisionGetter;
 
 pub enum MoverType {
     Own,
@@ -25,6 +26,11 @@ trait HasPhysics {
         dimension: &Dimension,
         // entity_collisions: Vec<VoxelShape>
     ) -> Vec3;
+    fn collide_with_shapes(
+        movement: &Vec3,
+        entity_box: &AABB,
+        // collision_boxes: Vec<VoxelShape>,
+    ) -> Vec3;
 }
 
 impl HasPhysics for Entity {
@@ -80,6 +86,16 @@ impl HasPhysics for Entity {
         let block_collisions =
             dimension.get_block_collisions(entity, entity_bounding_box.expand_towards(movement));
         collision_boxes.extend(block_collisions);
-        Self::collide_with_shapes(movement, &entity_bounding_box, &collision_boxes)
+        // Self::collide_with_shapes(movement, &entity_bounding_box, &collision_boxes)
+        Self::collide_with_shapes(movement, &entity_bounding_box)
+    }
+
+    fn collide_with_shapes(
+        movement: &Vec3,
+        entity_box: &AABB,
+        // collision_boxes: Vec<VoxelShape>,
+    ) -> Vec3 {
+        // TODO
+        *movement
     }
 }