Added default sprite attribute state

common/src/terrain/block.rs

@@ -156,50 +156,44 @@ impl Block {
 
     /* Constructors */
 
-    // TODO: Rename to `filled`
     #[inline]
-    pub const fn new(kind: BlockKind, color: Rgb<u8>) -> Self {
-        // TODO: we should probably assert this, overwriting the data fields with a
-        // colour is bad news
-        /*
-        #[cfg(debug_assertions)]
-        assert!(kind.is_filled());
-        */
+    pub(super) const fn from_raw(kind: BlockKind, data: [u8; 3]) -> Self { Self { kind, data } }
 
-        Self {
-            kind,
-            // Colours are only valid for non-fluids
-            data: if kind.is_filled() {
-                [color.r, color.g, color.b]
+    // TODO: Rename to `filled`, make caller guarantees stronger
+    #[inline]
+    #[track_caller]
+    pub const fn new(kind: BlockKind, color: Rgb<u8>) -> Self {
+        if kind.is_filled() {
+            Self::from_raw(kind, [color.r, color.g, color.b])
         } else {
-                [0; 3]
-            },
+            // Works because `SpriteKind::Empty` has no attributes
+            let data = (SpriteKind::Empty as u32).to_be_bytes();
+            Self::from_raw(kind, [data[1], data[2], data[3]])
         }
     }
 
     // Only valid if `block_kind` is unfilled, so this is just a private utility
     // method
     #[inline]
-    const fn unfilled(kind: BlockKind, sprite: SpriteKind) -> Self {
+    pub fn unfilled(kind: BlockKind, sprite: SpriteKind) -> Self {
         #[cfg(debug_assertions)]
         assert!(!kind.is_filled());
 
-        let sprite_bytes = (sprite as u32).to_be_bytes();
-
-        Self {
-            kind,
-            data: [sprite_bytes[1], sprite_bytes[2], sprite_bytes[3]],
-        }
+        Self::from_raw(kind, sprite.to_initial_bytes())
     }
 
     #[inline]
-    pub const fn air(sprite: SpriteKind) -> Self { Self::unfilled(BlockKind::Air, sprite) }
+    pub fn air(sprite: SpriteKind) -> Self { Self::unfilled(BlockKind::Air, sprite) }
 
     #[inline]
-    pub const fn empty() -> Self { Self::air(SpriteKind::Empty) }
+    pub const fn empty() -> Self {
+        // Works because `SpriteKind::Empty` has no attributes
+        let data = (SpriteKind::Empty as u32).to_be_bytes();
+        Self::from_raw(BlockKind::Air, [data[1], data[2], data[3]])
+    }
 
     #[inline]
-    pub const fn water(sprite: SpriteKind) -> Self { Self::unfilled(BlockKind::Water, sprite) }
+    pub fn water(sprite: SpriteKind) -> Self { Self::unfilled(BlockKind::Water, sprite) }
 
     /* Sprite decoding */
 
@@ -258,6 +252,9 @@ impl Block {
         }
     }
 
+    #[inline(always)]
+    pub(super) const fn data(&self) -> [u8; 3] { self.data }
+
     #[inline(always)]
     pub(super) const fn with_data(mut self, data: [u8; 3]) -> Self {
         self.data = data;
@@ -428,12 +425,12 @@ impl Block {
         };
 
         if self
-            .get_attr::<sprite::LightDisabled>()
-            .map_or(false, |l| l.0)
+            .get_attr::<sprite::LightEnabled>()
+            .map_or(true, |l| l.0)
         {
-            None
-        } else {
             Some(glow_level)
+        } else {
+            None
         }
     }
 
@@ -636,7 +633,7 @@ impl Block {
 
     /// Apply a light toggle to this block, if possible
     pub fn with_toggle_light(self, enable: bool) -> Option<Self> {
-        self.with_attr(sprite::LightDisabled(!enable)).ok()
+        self.with_attr(sprite::LightEnabled(enable)).ok()
     }
 
     #[inline]
@@ -662,7 +659,7 @@ impl Block {
     #[must_use]
     pub fn into_vacant(self) -> Self {
         if self.is_fluid() {
-            Block::new(self.kind(), Rgb::zero())
+            Block::unfilled(self.kind(), SpriteKind::Empty)
         } else {
             // FIXME: Figure out if there's some sensible way to determine what medium to
             // replace a filled block with if it's removed.
@@ -698,7 +695,7 @@ mod tests {
     #[test]
     fn convert_u32() {
         for bk in BlockKind::iter() {
-            let block = Block::new(bk, Rgb::new(165, 90, 204)); // Pretty unique bit patterns
+            let block = Block::from_raw(bk, [165, 90, 204]); // Pretty unique bit patterns
             if bk.is_filled() {
                 assert_eq!(Block::from_u32(block.to_u32()), Some(block));
             } else {

common/src/terrain/mod.rs

@@ -286,7 +286,7 @@ impl TerrainChunk {
     pub fn water(sea_level: i32) -> TerrainChunk {
         TerrainChunk::new(
             sea_level,
-            Block::new(BlockKind::Water, Rgb::zero()),
+            Block::water(SpriteKind::Empty),
             Block::air(SpriteKind::Empty),
             TerrainChunkMeta::void(),
         )

common/src/terrain/sprite.rs

@@ -349,7 +349,7 @@ sprites! {
         SeaDecorPillar   = 0x1E,
         MagicalSeal      = 0x1F,
     },
-    Lamp = 7 has Ori, LightDisabled {
+    Lamp = 7 has Ori, LightEnabled {
         // Standalone lights
         Lantern         = 0,
         StreetLamp      = 1,
@@ -362,20 +362,28 @@ sprites! {
 attributes! {
     Ori { bits: 4, err: Infallible, from: |bits| Ok(Self(bits as u8)), into: |Ori(x)| x as u16 },
     Growth { bits: 4, err: Infallible, from: |bits| Ok(Self(bits as u8)), into: |Growth(x)| x as u16 },
-    LightDisabled { bits: 1, err: Infallible, from: |bits| Ok(Self(bits == 1)), into: |LightDisabled(x)| x as u16 },
+    LightEnabled { bits: 1, err: Infallible, from: |bits| Ok(Self(bits == 1)), into: |LightEnabled(x)| x as u16 },
 }
 
 // The orientation of the sprite, 0..16
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[derive(Copy, Clone, Default, Debug, PartialEq, Eq)]
 pub struct Ori(pub u8);
 
 // The growth of the plant, 0..16
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub struct Growth(pub u8);
 
-// Whether a light has been toggled off.
+impl Default for Growth {
+    fn default() -> Self { Self(15) }
+}
+
+// Whether a light has been toggled on or off.
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
-pub struct LightDisabled(pub bool);
+pub struct LightEnabled(pub bool);
+
+impl Default for LightEnabled {
+    fn default() -> Self { Self(true) }
+}
 
 impl SpriteKind {
     #[inline]

common/src/terrain/sprite/magic.rs

@@ -158,6 +158,15 @@ macro_rules! sprites {
                     },)*
                 }
             }
+
+            #[inline] pub(super) fn to_initial_bytes(self) -> [u8; 3] {
+                let sprite_bytes = (*self as u32).to_be_bytes();
+                let block = Block::from_raw(super::BlockKind::Air, [sprite_bytes[1], sprite_bytes[2], sprite_bytes[3]]);
+                match self.category() {
+                    $(Category::$category_name => block$($(.with_attr($attr::default()).unwrap())*)?,)*
+                }
+                    .data()
+            }
         }
     };
 }
@@ -170,12 +179,14 @@ pub enum AttributeError<E> {
     Attribute(E),
 }
 
-pub trait Attribute: Sized {
-    /// The unique index assigned to this attribute, used to index offset arrays
+pub trait Attribute: Default + Sized {
+    /// The unique index assigned to this attribute, used to index offset
+    /// arrays.
     const INDEX: usize;
-    /// The number of bits required to represent this attribute
+    /// The number of bits required to represent this attribute.
     const BITS: u8;
-    type Error;
+    /// The error that might occur when decoding the attribute from bits.
+    type Error: core::fmt::Debug;
     fn from_bits(bits: u16) -> Result<Self, Self::Error>;
     fn into_bits(self) -> u16;
 }

voxygen/src/mesh/terrain.rs

@@ -294,7 +294,7 @@ pub fn generate_mesh<'a>(
         let d = d + 2;
         let flat = {
             let mut volume = vol.cached();
-            const AIR: Block = Block::air(common::terrain::sprite::SpriteKind::Empty);
+            const AIR: Block = Block::empty();
             // TODO: Once we can manage it sensibly, consider using something like
             // Option<Block> instead of just assuming air.
             let mut flat = vec![AIR; (w * h * d) as usize];

voxygen/src/scene/terrain/watcher.rs

@@ -142,8 +142,8 @@ impl BlocksOfInterest {
                 _ => {
                     if let Some(sprite) = block.get_sprite() {
                         if sprite.category() == sprite::Category::Lamp {
-                            if let Ok(sprite::LightDisabled(disabled)) = block.get_attr() {
-                                interactables.push((pos, Interaction::LightToggle(disabled)));
+                            if let Ok(sprite::LightEnabled(enabled)) = block.get_attr() {
+                                interactables.push((pos, Interaction::LightToggle(!enabled)));
                             }
                         }
 

world/src/layer/mod.rs

@@ -47,7 +47,7 @@ pub struct Colors {
     pub vein: (u8, u8, u8),
 }
 
-const EMPTY_AIR: Block = Block::air(SpriteKind::Empty);
+const EMPTY_AIR: Block = Block::empty();
 
 pub struct PathLocals {
     pub riverless_alt: f32,

world/src/site/settlement/building/archetype/keep.rs

@@ -167,7 +167,7 @@ impl Archetype for Keep {
             make_block(colors.pole.0, colors.pole.1, colors.pole.2).with_priority(important_layer);
         let flag =
             make_block(flag_color.0, flag_color.1, flag_color.2).with_priority(important_layer);
-        const AIR: Block = Block::air(SpriteKind::Empty);
+        const AIR: Block = Block::empty();
         const EMPTY: BlockMask = BlockMask::nothing();
         let internal = BlockMask::new(AIR, internal_layer);