From 16bcc6daab84373cac0f4125c1580d3cb1261baf Mon Sep 17 00:00:00 2001
From: sanine-a <sanine.not@pm.me>
Date: Wed, 22 Mar 2023 12:12:31 -0500
Subject: move ecs systems into separate module

---
 main.lua | 76 +++++++++-------------------------------------------------------
 1 file changed, 10 insertions(+), 66 deletions(-)

(limited to 'main.lua')

diff --git a/main.lua b/main.lua
index 251f466..8dd9207 100644
--- a/main.lua
+++ b/main.lua
@@ -6,77 +6,21 @@ local gl = honey.gl
 local Vec3 = honey.Vec3
 local Mat4 = honey.Mat4
 local ecs = honey.ecs
+local systems = honey.standardSystems
 
 
 -- camera matrices
 local camera = {
-	view=Mat4.Identity(),
-	projection=Mat4(),
+	view=Mat4():identity():translate(Vec3{0, 0, -60}),
+	projection=Mat4():perspective(math.rad(45), 640/480, 0.1, 100),
 }
-camera.view:translate(Vec3{0, 0, -60})
-camera.projection:perspective(math.rad(45), 640/480, 0.1, 100)
 
 
 
-function recursiveComputeTransform(entity)
-	if entity._transformComputed then 
-		return entity._transform 
-	end
-	if entity.parent == false then
-		entity._transformComputed = true
-		entity._transform = entity.transform
-		return entity.transform
-	end
-
-	entity._transformComputed = true
-	local parentTransform = recursiveComputeTransform(entity.parent)
-	entity._transform = parentTransform * entity.transform
-	return entity._transform
-end
-
 local level = ecs.Level()
--- update transforms
-level:addSystem{
-	filter=ecs.Filter.AND{"transform", "parent"},
-	update=function(entity, dt)
-		recursiveComputeTransform(entity)
-	end,
-	priority=1,
-}
-level:addSystem{
-	filter=ecs.Filter.AND{"transform", "parent"},
-	update=function(entity, dt)
-		entity._transform = nil
-		entity._transformComputed = false
-	end,
-	priority=0,
-}
-
--- render objects
-level:addSystem{
-	filter=ecs.Filter.AND{"mesh", "shader", "transform"},
-	update=function(entity, dt)
-		entity.shader:use()
-		entity.shader:configure{
-			matrix={
-				model=entity._transform,
-				view=camera.view,
-				projection=camera.projection,
-			},
-		}
-		entity.mesh:drawElements()
-	end,
-	priority=99,
-}
-
--- run custom scripts
-level:addSystem{
-	filter=ecs.Filter.AND{"update"},
-	update=function(entity, dt)
-		entity.update(entity, dt)
-	end,
-	priority=50,
-}
+level:addSystem(systems.transformCascade)
+level:addSystem(systems.renderCam(camera))
+level:addSystem(systems.update)
 
 
 
@@ -149,12 +93,12 @@ function growLine(prev, depth)
 	if depth == 0 then return prev end
 
 	local entity = {
-		transform=Mat4.Identity(),
+		transform=Mat4():identity():translate(Vec3{2, 0, 0}),
+		parent=false,
 		mesh=octa,
 		shader=shader,
 		update=updateTransform,
 	}
-	entity.transform:translate(Vec3{2, 0, 0})
 	prev.parent = entity
 	level:addEntity(prev)
 	return growLine(entity, depth-1)
@@ -162,12 +106,12 @@ end
 
 
 local leaf = {
-	transform=Mat4.Identity(),
+	transform=Mat4():identity():translate(Vec3{2, 0, 0}),
+	parent=false,
 	mesh=tetra,
 	shader=shader,
 }
 local root = growLine(leaf, 24)
-root.parent = false
 level:addEntity(root)
 
 
-- 
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