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local ecs = require 'honey.ecs'
local module = {}
setmetatable(module, {__index=_G})
setfenv(1, module)
--===== transform cascading =====--
local 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
-- update transforms
transformCascade = {
filter=ecs.Filter.AND{"transform", "parent"},
preUpdate=function(entity)
entity._transform = nil
entity._transformComputed = false
end,
update=function(entity, dt)
recursiveComputeTransform(entity)
end,
priority=98,
}
--===== rendering =====--
function renderCam(camera, priority)
local priority = priority or 99
return {
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=priority,
}
end
--===== update functions =====--
update = {
filter=ecs.Filter.AND{"update"},
update=function(entity, dt)
entity.update(entity, dt)
end,
priority=50,
}
return module
|
