1 files changed, 142 insertions, 0 deletions
diff --git a/server/block_def.go b/server/block_def.go
new file mode 100644
index 0000000..3b0474a
--- /dev/null
+++ b/server/block_def.go
@@ -0,0 +1,142 @@
+package server
+
+import (
+	"iter"
+	"git.citrons.xyz/metronode/classic"
+)
+
+type blockType int16
+
+const (
+	walkThrough = classic.WalkThrough
+	swimThrough = classic.SwimThrough
+	solid = classic.Solid
+	partiallySlippery = classic.PartiallySlippery
+	fullySlippery = classic.FullySlippery
+	water = classic.Water
+	lava = classic.Lava
+	rope = classic.Rope
+)
+type blockSolidity byte
+
+const (
+	noSound = classic.NoSound
+	woodSound = classic.WoodSound
+	gravelSound = classic.GravelSound
+	grassSound = classic.GrassSound
+	stoneSound = classic.StoneSound
+	metalSound = classic.MetalSound
+	glassSound = classic.GlassSound
+	woolSound = classic.WoolSound
+	sandSound = classic.SandSound
+	snowSound = classic.SnowSound
+)
+type blockSound byte
+
+const (
+	opaque = classic.Opaque
+	transparentGlass = classic.TransparentGlass
+	transparentLeaves = classic.TransparentLeaves
+	translucent = classic.Translucent
+	invisible = classic.Invisible
+)
+type blockOpacity byte
+
+const (
+	cubeShape = iota
+	spriteShape
+	cuboidShape
+)
+type blockShape byte
+
+type textureId int
+const fillTextures = -1
+
+type blockDef struct {
+	Name string
+	Solidity blockSolidity
+	MovementSpeed byte
+	Textures [6]textureId
+	TransmitsLight bool
+	WalkSound blockSound
+	FullBright bool
+	Shape blockShape
+	Min [3]byte
+	Max [3]byte
+	Opacity blockOpacity
+	FogDensity byte
+	FogColor [3]byte
+}
+
+func getBlockDefPackets() iter.Seq[classic.Packet] {
+	return func(yield func(classic.Packet) bool) {
+		for id, def := range blockDefinitions { 
+			var packet classic.Packet
+			var (
+				transmitsLight byte
+				fullBright byte
+			)
+			if def.TransmitsLight {
+				transmitsLight = 1
+			}
+			if def.FullBright {
+				fullBright = 1
+			}
+			if def.Shape != spriteShape {
+				var (i int; texture textureId)
+				for i, texture = range def.Textures {
+					if texture == fillTextures {
+						break
+					}
+				}
+				if texture == fillTextures {
+					for i = i; i < len(def.Textures); i++ {
+						def.Textures[i] = def.Textures[i - 1]
+					}
+				}
+				if def.Shape == cubeShape {
+					def.Min = [3]byte {0, 0, 0}
+					def.Max = [3]byte {16, 16, 16}
+				}
+				packet = &classic.DefineBlockExt {
+					BlockId: byte(id),
+					Name: classic.PadString(def.Name),
+					Solidity: byte(def.Solidity),
+					MovementSpeed: def.MovementSpeed,
+					TopTextureId: byte(def.Textures[0]),
+					LeftTextureId: byte(def.Textures[1]),
+					RightTextureId: byte(def.Textures[2]),
+					FrontTextureId: byte(def.Textures[3]),
+					BackTextureId: byte(def.Textures[4]),
+					BottomTextureId: byte(def.Textures[5]),
+					TransmitsLight: transmitsLight,
+					WalkSound: byte(def.WalkSound),
+					FullBright: fullBright,
+					Min: def.Min,
+					Max: def.Max,
+					BlockDraw: byte(def.Opacity),
+					FogDensity: def.FogDensity,
+					FogColor: def.FogColor,
+				}
+			} else {
+				packet = &classic.DefineBlock {
+					BlockId: byte(id),
+					Name: classic.PadString(def.Name),
+					Solidity: byte(def.Solidity),
+					MovementSpeed: def.MovementSpeed,
+					SideTextureId: byte(def.Textures[0]),
+					TransmitsLight: transmitsLight,
+					WalkSound: byte(def.WalkSound),
+					FullBright: fullBright,
+					Shape: 0,
+					BlockDraw: byte(def.Opacity),
+					FogDensity: def.FogDensity,
+					FogColor: def.FogColor,
+				}
+			}
+			if !yield(packet) {
+				return
+			}
+		}
+	}
+}