From e5553bb81c93cd76456d07d3a1d7e8bb1b249b6e Mon Sep 17 00:00:00 2001
From: sanine-a <sanine.not@pm.me>
Date: Thu, 23 Mar 2023 13:35:37 -0500
Subject: implement skeleton of physics system

---
 honey/ecs-systems.lua |  8 ++++----
 honey/ecs.lua         | 19 +++++++++++--------
 honey/mat4.lua        |  6 ++++++
 honey/quaternion.lua  | 30 ++++++++++++++++++++++++++++++
 honey/std.lua         |  1 +
 5 files changed, 52 insertions(+), 12 deletions(-)
 create mode 100644 honey/quaternion.lua

(limited to 'honey')

diff --git a/honey/ecs-systems.lua b/honey/ecs-systems.lua
index a511b3d..237aa78 100644
--- a/honey/ecs-systems.lua
+++ b/honey/ecs-systems.lua
@@ -28,11 +28,11 @@ end
 -- update transforms
 transformCascade = {
 	filter=ecs.Filter.AND{"transform", "parent"},
-	preUpdate=function(entity)
+	prepareEntity=function(self, entity)
 		entity._transform = nil
 		entity._transformComputed = false
 	end,
-	update=function(entity, dt)
+	update=function(self, entity, dt)
 		recursiveComputeTransform(entity)
 	end,
 	priority=98,
@@ -45,7 +45,7 @@ function renderCam(camera, priority)
 	local priority = priority or 99
 	return {
 		filter=ecs.Filter.AND{"mesh", "shader", "transform"},
-		update=function(entity, dt)
+		update=function(self, entity, dt)
 			entity.shader:use()
 			entity.shader:configure{
 				matrix={
@@ -64,7 +64,7 @@ end
 
 update = {
 	filter=ecs.Filter.AND{"update"},
-	update=function(entity, dt)
+	update=function(self, entity, dt)
 		entity.update(entity, dt)
 	end,
 	priority=50,
diff --git a/honey/ecs.lua b/honey/ecs.lua
index 23bb0ba..d611b37 100644
--- a/honey/ecs.lua
+++ b/honey/ecs.lua
@@ -123,6 +123,9 @@ function Level.addSystem(self, system)
 	system.entities = {}
 	table.insert(self.systems, system)
 	table.sort(self.systems, systemLt)
+	if system.setup then
+		system.setup(system)
+	end
 end
 
 
@@ -131,7 +134,7 @@ local function addEntityToSystem(system, id, entity)
 	if system.entities[id] then return end
 
 	if system.onAddEntity then
-		system.onAddEntity(id, entity)
+		system:onAddEntity(id, entity)
 	end
 	system.entities[id] = true
 end
@@ -142,7 +145,7 @@ local function removeEntityFromSystem(system, id, entity)
 	if not system.entities[id] then return end
 
 	if system.onRemoveEntity then
-		system.onRemoveEntity(id, entity)
+		system:onRemoveEntity(id, entity)
 	end
 	system.entities[id] = nil
 end
@@ -195,20 +198,20 @@ end
 function Level.update(self, dt)
 	for _, system in ipairs(self.systems) do
 		if system.preUpdate then
+			system:preUpdate()
+		end
+		if system.prepareEntity then
 			for id in pairs(system.entities) do
 				local entity = self.entities[id]
-				system.preUpdate(entity)
+				system:prepareEntity(entity)
 			end
 		end
 		for id in pairs(system.entities) do
 			local entity = self.entities[id]
-			system.update(entity, dt)
+			system:update(entity, dt)
 		end
 		if system.postUpdate then
-			for id in pairs(system.entities) do
-				local entity = self.entities[id]
-				system.postUpdate(entity)
-			end
+			system:postUpdate()
 		end
 	end
 end
diff --git a/honey/mat4.lua b/honey/mat4.lua
index 6ea17fd..cdc5e7d 100644
--- a/honey/mat4.lua
+++ b/honey/mat4.lua
@@ -114,6 +114,12 @@ function Mat4.zero(self)
 end
 
 
+function Mat4.mul(self, other)
+	glm.mat4_mul(self.data, other.data, self.data)
+	return self
+end
+
+
 function Mat4.translate(self, vec)
 	glm.translate(self.data, vec.data)
 	return self
diff --git a/honey/quaternion.lua b/honey/quaternion.lua
new file mode 100644
index 0000000..6fbfdd5
--- /dev/null
+++ b/honey/quaternion.lua
@@ -0,0 +1,30 @@
+local glm = honey.glm
+local Mat4 = require "honey.mat4"
+
+local module = {}
+setmetatable(module, {__index=_G})
+setfenv(1, module)
+
+Quaternion = {}
+Quaternion.__index = Quaternion
+
+
+function Quaternion.new(_, tbl)
+	local tbl = tbl or { 0, 0, 0, 0 }
+	local self = {}
+	self.data = glm.quat_create()
+	glm.quat_init(self.data, unpack(tbl))
+	setmetatable(self, Quaternion)
+	return self
+end
+setmetatable(Quaternion, {__call=Quaternion.new})
+
+
+function Quaternion.toMat4(self)
+	local m = Mat4()
+	glm.quat_mat4(self.data, m.data)
+	return m
+end
+
+
+return module.Quaternion
diff --git a/honey/std.lua b/honey/std.lua
index 7cb7695..80b071e 100644
--- a/honey/std.lua
+++ b/honey/std.lua
@@ -11,3 +11,4 @@ honey.mesh            = require 'honey.mesh'
 honey.Shader          = require 'honey.shader'
 honey.Vec3            = require 'honey.vec3'
 honey.Window          = require 'honey.window'
+honey.Quaternion      = require 'honey.quaternion'
-- 
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