From 02247e743b83669e2d799111fc10a4772de66dfc Mon Sep 17 00:00:00 2001
From: sanine-a <sanine.not@pm.me>
Date: Tue, 9 May 2023 12:24:28 -0500
Subject: add ecs.Accessor helper and node _child hierarchy

---
 honey/ecs/ecs.lua  | 25 +++++++++++++++++++++++++
 honey/ecs/node.lua | 12 ++++++++----
 main.lua           | 18 ++++++++++--------
 3 files changed, 43 insertions(+), 12 deletions(-)

diff --git a/honey/ecs/ecs.lua b/honey/ecs/ecs.lua
index b0409e4..301ed36 100644
--- a/honey/ecs/ecs.lua
+++ b/honey/ecs/ecs.lua
@@ -271,4 +271,29 @@ function SystemDb.removeSystem(self, id)
 end
 
 
+--===== Access helper =====--
+
+
+function Accessor(db, id)
+	local tbl = {
+		__db = db,
+		__id = id,
+	}
+
+	setmetatable(tbl, {
+		__index=function(self, key)
+			return self.__db:getComponent(self.__id, key)
+		end,
+		__newindex=function(self, key, value)
+			self.__db:addComponent(self.__id, key, value)
+		end,
+		__tostring=function(self)
+			return string.format("Accessor<%s>", self.__id)
+		end,
+	})
+
+	return tbl
+end
+
+
 return module
diff --git a/honey/ecs/node.lua b/honey/ecs/node.lua
index 39f1898..645946c 100644
--- a/honey/ecs/node.lua
+++ b/honey/ecs/node.lua
@@ -18,7 +18,7 @@ system = function(params)
 			end
 	
 			-- helper function
-			local function recursiveTransform(node)
+			local function recursiveTransform(id, node)
 				if node._visited then
 					return node._matrix
 				end
@@ -26,9 +26,13 @@ system = function(params)
 				if not node.parent then
 					node._matrix = node.matrix
 				else
-					local parentTransform = self.db:getComponent(node.parent, "node")
-					local parentMatrix = recursiveTransform(parentTransform)
+					local parentNode = self.db:getComponent(node.parent, "node")
+					local parentMatrix = recursiveTransform(node.parent, parentNode)
 					node._matrix = parentMatrix * node.matrix
+					if node.name then
+						if not parentNode._child then parentNode._child = {} end
+						parentNode._child[node.name] = honey.ecs.Accessor(self.db, id)
+					end
 				end
 				node._visited = true
 				return node._matrix
@@ -36,7 +40,7 @@ system = function(params)
 	
 			-- compute nodes
 			for id, node in pairs(nodes) do
-				recursiveTransform(node)
+				recursiveTransform(id, node)
 			end
 		end,
 	}
diff --git a/main.lua b/main.lua
index efee1a2..4984355 100644
--- a/main.lua
+++ b/main.lua
@@ -160,11 +160,13 @@ function setupEntities()
 			mesh = { filename="assets/capsule.obj", index=1 },
 			shader = { vertex="vertex.glsl", fragment="fragment.glsl" },
 		},
+		script = { script = "capsuleMove" },
 	}
 
 
 	local pivotPivot = entities:createEntityWithComponents{
 		node = {
+			name = "p",
 			parent = capsule,
 			matrix = Mat4():identity():rotateX(-0.5*math.pi),
 		},
@@ -173,6 +175,7 @@ function setupEntities()
 
 	local capcamPivot = entities:createEntityWithComponents{
 		node = {
+			name = "pivot",
 			parent = pivotPivot,
 			matrix = Mat4():identity(),
 		},
@@ -181,7 +184,6 @@ function setupEntities()
 			yaw = 0,
 		},
 		onCursorPos = { script = "cameraCursorPos" },
-		script = { script = "capsuleMove" },
 	}
 	package.loaded["cameraCursorPos"] = (function()
 		local prevx, prevy
@@ -191,7 +193,6 @@ function setupEntities()
 			end
 			local dx = data.xpos - prevx
 			local dy = data.ypos - prevy
-			print(dx,dy)
 			prevx, prevy = data.xpos, data.ypos
 
 			local node = entities:getComponent(id, "node")
@@ -209,17 +210,18 @@ function setupEntities()
 	end)()
 
 	package.loaded["capsuleMove"] = function(entities, id, dt)
+		local self = ecs.Accessor(entities, id)
 		local pressed = function(key)
 			return glfw.GetKey(window.win, key) == glfw.PRESS
 		end
 
-		local py = entities:getComponent(id, "pitchyaw")
-		local yaw = math.rad(py.yaw)
+		local yaw = math.rad(
+			self.node._child.p
+				.node._child.pivot
+					.pitchyaw.yaw)
 		local forward = Vec3{-math.sin(yaw), 0, -math.cos(yaw)}
 		local left = Vec3{-math.cos(yaw), 0, math.sin(yaw)}
 
-		print(forward, left)
-
 		local capsule = entities:getComponent(capsule, "physics")
 
 		local vel = Vec3{0,0,0}
@@ -239,9 +241,9 @@ function setupEntities()
 
 		vel = 10000 * vel:normalize()
 			
-		x, y, z = ode.BodyGetLinearVel(capsule._body)
+		x, y, z = ode.BodyGetLinearVel(self.physics._body)
 		if Vec3{x,y,z}:norm2() < 500 then
-			ode.BodyAddForce(capsule._body, vel[1], vel[2], vel[3])
+			ode.BodyAddForce(self.physics._body, vel[1], vel[2], vel[3])
 		end
 	end
 
-- 
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