spine-runtimes/spine-lua/attachments/MeshAttachment.lua

-------------------------------------------------------------------------------
-- Spine Runtimes Software License
-- Version 2.3
-- 
-- Copyright (c) 2013-2015, Esoteric Software
-- All rights reserved.
-- 
-- You are granted a perpetual, non-exclusive, non-sublicensable and
-- non-transferable license to use, install, execute and perform the Spine
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-- Section 2 of the Spine Software License Agreement), you may not (a) modify,
-- translate, adapt or otherwise create derivative works, improvements of the
-- Software or develop new applications using the Software or (b) remove,
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-- or other intellectual property or proprietary rights notices on or in the
-- Software, including any copy thereof. Redistributions in binary or source
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-- EVENT SHALL ESOTERIC SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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-------------------------------------------------------------------------------

local setmetatable = setmetatable
local AttachmentType = require "spine-lua.attachments.AttachmentType"
local VertexAttachment = require "spine-lua.attachments.VertexAttachment"
local utils = require "spine-lua.utils"
local Color = require "spine-lua.Color"

local MeshAttachment = {}
MeshAttachment.__index = MeshAttachment
setmetatable(MeshAttachment, { __index = VertexAttachment })

function MeshAttachment.new (name)
	if not name then error("name cannot be nil", 2) end

	local self = VertexAttachment.new(name, AttachmentType.mesh)
  self.region = nil
  self.path = nil
  self.regionUVs = nil
  self.worldVertices = nil
  self.triangles = nil
  self.color = Color.newWith(1, 1, 1, 1)
  self.hullLength = 0
  self.parentMesh = nil
  self.inheritDeform = false
  self.tempColor = Color.newWith(1, 1, 1, 1)
  setmetatable(self, MeshAttachment)
	return self
end

function MeshAttachment:updateUVs ()
  local regionUVs = self.regionUVs
  local verticesLength = #regionUVs
  local worldVerticesLength = (verticesLength / 2) * 8
  if not self.worldVertices or #self.worldVertices ~= worldVerticesLength then
    self.worldVertices = utils.newNumberArray(worldVerticesLength)
  end

  local u = 0
  local v = 0
  local width = 0
  local height = 0
  if not self.region then
    u = 0
    v = 0
    width = 1
    height = 1
  else
    u = self.region.u;
    v = self.region.v;
    width = self.region.u2 - u;
    height = self.region.v2 - v;
  end
  if self.region and self.region.rotate then
    local i = 0
    local w = 2
    while i < verticesLength do
      self.worldVertices[w + 1] = u + regionUVs[i + 2] * width;
      self.worldVertices[w + 2] = v + height - regionUVs[i + 1] * height;
      i = i + 2
      w = w + 8
    end
  else
    local i = 0
    local w = 2
    while i < verticesLength do
      self.worldVertices[w + 1] = u + regionUVs[i + 1] * width;
      self.worldVertices[w + 2] = v + regionUVs[i + 2] * height;
      i = i + 2
      w = w + 8
    end
  end
end

function MeshAttachment:updateWorldVertices(slot, premultipliedAlpha)
  local skeleton = slot.bone.skeleton
  local skeletonColor = skeleton.color
  local slotColor = slot.color
  local meshColor = self.color
  
  local alpha = skeletonColor.a * slotColor.a * meshColor.a
  local multiplier = 1
  if premultipliedAlpha then multiplier = alpha end
  local color = self.tempColor
  color:set(skeletonColor.r * slotColor.r * meshColor.r * multiplier,
    skeletonColor.g * slotColor.g * meshColor.g * multiplier,
    skeletonColor.b * slotColor.b * meshColor.b * multiplier,
    alpha)

  local x = skeleton.x
  local y = skeleton.y
  local deformArray = slot.attachmentVertices
  local vertices = self.vertices
  local worldVertices = self.worldVertices
  local bones = self.bones
  if not bones then
    local verticesLength = #vertices
    if #deformArray > 0 then vertices = deformArray end
    local bone = slot.bone;
    x = x + bone.worldX
    y = y + bone.worldY
    local a = bone.a
    local b = bone.b
    local c = bone.c
    local d = bone.d
    local v = 0
    local w = 0
    while v < verticesLength do
      local vx = vertices[v + 1]
      local vy = vertices[v + 2]
      worldVertices[w + 1] = vx * a + vy * b + x
      worldVertices[w + 2] = vx * c + vy * d + y
      worldVertices[w + 5] = color.r
      worldVertices[w + 6] = color.g
      worldVertices[w + 7] = color.b
      worldVertices[w + 8] = color.a
      v = v + 2
      w = w + 8
    end
    return worldVertices
  end
  
  local skeletonBones = skeleton.bones
  if #deformArray == 0 then
    local w = 0
    local v = 0
    local b = 0
    local n = #bones
    while v < n do
      local wx = x
      local wy = y
      local nn = bones[v + 1];
      v = v + 1
      nn = nn + v
      while v < nn do
        local bone = skeletonBones[bones[v + 1]];
        local vx = vertices[b + 1]
        local vy = vertices[b + 2]
        local weight = vertices[b + 3]
        wx = wx + (vx * bone.a + vy * bone.b + bone.worldX) * weight
        wy = wy + (vx * bone.c + vy * bone.d + bone.worldY) * weight
        v = v + 1
        b = b + 3
      end
      worldVertices[w + 1] = wx
      worldVertices[w + 2] = wy
      worldVertices[w + 5] = color.r
      worldVertices[w + 6] = color.g
      worldVertices[w + 7] = color.b
      worldVertices[w + 8] = color.a
      w = w + 8
    end
  else
    local deform = deformArray;
    local w = 0
    local v = 0
    local b = 0
    local f = 0
    local n = #bones
    while v < n do
      local wx = x
      local wy = y
      local nn = bones[v + 1]
      v = v + 1
      nn = nn + v
      while v < nn do
        local bone = skeletonBones[bones[v + 1]];
        local vx = vertices[b + 1] + deform[f + 1]
        local vy = vertices[b + 2] + deform[f + 2]
        local weight = vertices[b + 3]
        wx = wx + (vx * bone.a + vy * bone.b + bone.worldX) * weight
        wy = wy + (vx * bone.c + vy * bone.d + bone.worldY) * weight
        b = b + 3
        f = f + 2
        v = v + 1
      end
      worldVertices[w + 1] = wx;
      worldVertices[w + 2] = wy;
      worldVertices[w + 5] = color.r;
      worldVertices[w + 6] = color.g;
      worldVertices[w + 7] = color.b;
      worldVertices[w + 8] = color.a;
      w = w + 8
    end
  end
  return worldVertices;
end

function MeshAttachment:applyDeform (sourceAttachment)
  return self == sourceAttachment or (self.inheritDeform and self.parentMesh == sourceAttachment)
end

function MeshAttachment:setParentMesh (parentMesh)
  self.parentMesh = parentMesh
  if parentMesh then
    self.bones = parentMesh.bones
    self.vertices = parentMesh.vertices
    self.regionUVs = parentMesh.regionUVs
    self.triangles = parentMesh.triangles
    self.hullLength = parentMesh.hullLength
  end
end

return MeshAttachment