mirror of
https://github.com/codeninjasllc/codecombat.git
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200 lines
8.7 KiB
CoffeeScript
200 lines
8.7 KiB
CoffeeScript
{clone, typedArraySupport} = require './world_utils'
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Vector = require './vector'
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if typedArraySupport
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FloatArrayType = Float32Array # Better performance than Float64Array
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bytesPerFloat = FloatArrayType.BYTES_PER_ELEMENT ? FloatArrayType.prototype.BYTES_PER_ELEMENT
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else
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bytesPerFloat = 4
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module.exports = class ThangState
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@className: "ThangState"
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@trackedPropertyTypes: [
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"boolean"
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"number"
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"string"
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"array" # will turn everything into strings
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"object" # grrr
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"Vector"
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"Thang" # serialized as ids, like strings
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]
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hasRestored: false
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constructor: (thang) ->
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@props = [] # parallel array to @thang's trackedPropertiesKeys/Types
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return unless thang
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@thang = thang
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for prop, propIndex in thang.trackedPropertiesKeys
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type = thang.trackedPropertiesTypes[propIndex]
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value = thang[prop]
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if type is 'Vector'
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@props.push value?.copy() # could try storing [x, y, z] or {x, y, z} here instead if this is expensive
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else if type is 'object'
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@props.push = clone(value, true)
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else
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@props.push value
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# Either pass storage and type, or don't pass either of them
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getStoredProp: (propIndex, type, storage) ->
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# Optimize it
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unless type
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type = @trackedPropertyTypes[propIndex]
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storage = @trackedPropertyValues[propIndex]
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if type is "Vector"
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value = new Vector storage[3 * @frameIndex], storage[3 * @frameIndex + 1], storage[3 * @frameIndex + 2]
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else if type is 'string'
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specialKey = storage[@frameIndex]
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value = @specialKeysToValues[specialKey]
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else if type is 'Thang'
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specialKey = storage[@frameIndex]
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value = @thang.world.getThangByID @specialKeysToValues[specialKey]
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else if type is 'array'
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specialKey = storage[@frameIndex]
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value = @specialKeysToValues[specialKey]
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# Remove leading and trailing Group Separators and split by any Record Separators to restore the array of strings
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value = value.substring(1, value.length - 1).split('\x1E') if value
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else
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value = storage[@frameIndex]
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value
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getStateForProp: (prop) ->
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# Get the property, whether we have it stored in @props or in @trackedPropertyValues. Optimize it.
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# Figured based on http://jsperf.com/object-vs-array-vs-native-linked-list/13 that it should be faster with small arrays to do the indexOf reads (each up to 24x faster) than to do a single object read, and then we don't have to maintain an extra @props object; just keep array
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propIndex = @trackedPropertyKeys.indexOf prop
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return null if propIndex is -1
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value = @props[propIndex]
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return value if value isnt undefined or @hasRestored
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return @props[propIndex] = @getStoredProp propIndex
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restore: ->
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# Restore trackedProperties' values to @thang, retrieving them from @trackedPropertyValues if needed. Optimize it.
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return @ if @thang._state is @ and not @thang.partialState
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unless @hasRestored # Restoring in a deserialized World for first time
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props = []
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for prop, propIndex in @trackedPropertyKeys
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type = @trackedPropertyTypes[propIndex]
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storage = @trackedPropertyValues[propIndex]
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props.push(@thang[prop] = @getStoredProp propIndex, type, storage)
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#console.log @frameIndex, @thang.id, prop, propIndex, type, storage, "got", @thang[prop]
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@props = props
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@trackedPropertyTypes = @trackedPropertyValues = @specialKeysToValues = null # leave @trackedPropertyKeys for indexing
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@hasRestored = true
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else # Restoring later times
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for prop, propIndex in @trackedPropertyKeys
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@thang[prop] = @props[propIndex]
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@thang.partialState = false
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@
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restorePartial: (ratio) ->
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inverse = 1 - ratio
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for prop, propIndex in @trackedPropertyKeys when prop is "pos" or prop is "rotation"
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if @hasRestored
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value = @props[propIndex]
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else
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type = @trackedPropertyTypes[propIndex]
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storage = @trackedPropertyValues[propIndex]
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value = @getStoredProp propIndex, type, storage
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if prop is "pos"
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@thang.pos = @thang.pos.copy()
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@thang.pos.x = inverse * @thang.pos.x + ratio * value.x
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@thang.pos.y = inverse * @thang.pos.y + ratio * value.y
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@thang.pos.z = inverse * @thang.pos.z + ratio * value.z
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else if prop is "rotation"
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@thang.rotation = inverse * @thang.rotation + ratio * value
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@thang.partialState = true
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@
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serialize: (frameIndex, trackedPropertyIndices, trackedPropertyTypes, trackedPropertyValues, specialValuesToKeys, specialKeysToValues) ->
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# Performance hotspot--called once per tracked property per Thang per frame. Optimize the crap out of it.
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for type, newPropIndex in trackedPropertyTypes
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originalPropIndex = trackedPropertyIndices[newPropIndex]
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storage = trackedPropertyValues[newPropIndex]
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value = @props[originalPropIndex]
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if value
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# undefined, null, false, 0 won't trigger in this serialization code scheme anyway, so we can't differentiate between them when deserializing
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if type is "Vector"
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storage[3 * frameIndex] = value.x
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storage[3 * frameIndex + 1] = value.y
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storage[3 * frameIndex + 2] = value.z
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else if type is 'string'
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specialKey = specialValuesToKeys[value]
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unless specialKey
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specialKey = specialKeysToValues.length
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specialValuesToKeys[value] = specialKey
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specialKeysToValues.push value
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storage[frameIndex] = specialKey
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storage[frameIndex] = specialKey
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else if type is 'Thang'
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value = value.id
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specialKey = specialValuesToKeys[value]
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unless specialKey
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specialKey = specialKeysToValues.length
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specialValuesToKeys[value] = specialKey
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specialKeysToValues.push value
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storage[frameIndex] = specialKey
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storage[frameIndex] = specialKey
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else if type is 'array'
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# We make sure the array keys won't collide with any string keys by using some unprintable characters.
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value = '\x1D' + value.join('\x1E') + '\x1D' # Group Separator, Record Separator(s), Group Separator
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specialKey = specialValuesToKeys[value]
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unless specialKey
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specialKey = specialKeysToValues.length
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specialValuesToKeys[value] = specialKey
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specialKeysToValues.push value
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storage[frameIndex] = specialKey
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storage[frameIndex] = specialKey
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else
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storage[frameIndex] = value
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#console.log @thang.id, "assigned prop", originalPropIndex, newPropIndex, value, type, "at", frameIndex, "to", storage[frameIndex]
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null
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@deserialize: (world, frameIndex, thang, trackedPropertyKeys, trackedPropertyTypes, trackedPropertyValues, specialKeysToValues) ->
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# Optimize like no tomorrow--most performance-sensitive part of the whole app, called once per WorldFrame per Thang per trackedProperty, blocking the UI
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ts = new ThangState
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ts.thang = thang
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ts.frameIndex = frameIndex
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ts.trackedPropertyKeys = trackedPropertyKeys
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ts.trackedPropertyTypes = trackedPropertyTypes
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ts.trackedPropertyValues = trackedPropertyValues
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ts.specialKeysToValues = specialKeysToValues
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ts
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@transferableBytesNeededForType: (type, nFrames) ->
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bytes = switch type
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when "boolean" then 1
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when "number" then bytesPerFloat
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when "Vector" then bytesPerFloat * 3
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when "string" then 4
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when "Thang" then 4 # turn them into strings of their ids
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when "array" then 4 # turn them into strings and hope it doesn't explode?
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else 0
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# We need to be a multiple of bytesPerFloat otherwise bigger-byte array (Float64Array, etc.) offsets won't work
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# http://www.kirupa.com/forum/showthread.php?378737-Typed-Arrays-Y-U-No-offset-at-values-other-than-multiples-of-element-size
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bytesPerFloat * Math.ceil(nFrames * bytes / bytesPerFloat)
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@createArrayForType: (type, nFrames, buffer, offset) ->
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bytes = @transferableBytesNeededForType type, nFrames
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storage = switch type
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when "boolean"
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new Uint8Array(buffer, offset, nFrames)
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when "number"
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new FloatArrayType(buffer, offset, nFrames)
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when "Vector"
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new FloatArrayType(buffer, offset, nFrames * 3)
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when "string"
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new Uint32Array(buffer, offset, nFrames)
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when "Thang"
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new Uint32Array(buffer, offset, nFrames)
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when "array"
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new Uint32Array(buffer, offset, nFrames)
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else
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[]
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[storage, bytes]
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unless typedArraySupport
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# Fall back to normal arrays in IE 9
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ThangState.createArrayForType = (type, nFrames, buffer, offset) ->
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bytes = @transferableBytesNeededForType type, nFrames
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elementsPerFrame = if type is 'Vector' then 3 else 1
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storage = (0 for i in [0 ... nFrames * elementsPerFrame])
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[storage, bytes]
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