-------------------------------------------------------------------------------
-- Spine Runtimes Software License
-- Version 2.1
-- 
-- Copyright (c) 2013, Esoteric Software
-- All rights reserved.
-- 
-- You are granted a perpetual, non-exclusive, non-sublicensable and
-- non-transferable license to install, execute and perform the Spine Runtimes
-- Software (the "Software") solely for internal use. Without the written
-- permission of Esoteric Software (typically granted by licensing Spine), 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, delete, alter or obscure any trademarks or any copyright,
-- trademark, patent or other intellectual property or proprietary rights
-- notices on or in the Software, including any copy thereof. Redistributions
-- in binary or source form must include this license and terms.
-- 
-- THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
-- IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-- MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
-- EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
-- OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-- WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
-- OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-------------------------------------------------------------------------------

local AttachmentType = require "spine-lua.AttachmentType"

local MeshAttachment = {}
function MeshAttachment.new (name)
	if not name then error("name cannot be nil", 2) end
	
	local self = {
		name = name,
		type = AttachmentType.mesh,
		vertices = nil,
		uvs = nil,
		regionUVs = nil,
		triangles = nil,
		hullLength = 0,
		r = 1, g = 1, b = 1, a = 1,
		path = nil,
		rendererObject = nil,
		regionU = 0, regionV = 0, regionU2 = 0, regionV2 = 0, regionRotate = false,
		regionOffsetX = 0, regionOffsetY = 0,
		regionWidth = 0, regionHeight = 0,
		regionOriginalWidth = 0, regionOriginalHeight = 0,
		edges = nil,
		width = 0, height = 0
	}

	function self:updateUVs ()
		local width, height = self.regionU2 - self.regionU, self.regionV2 - self.regionV
		local n = #self.regionUVs
		if not self.uvs or #self.uvs ~= n then
			self.uvs = {}
		end
		if self.regionRotate then
			for i = 1, n, 2 do
				self.uvs[i] = self.regionU + self.regionUVs[i + 1] * width
				self.uvs[i + 1] = self.regionV + height - self.regionUVs[i] * height
			end
		else
			for i = 1, n, 2 do
				self.uvs[i] = self.regionU + self.regionUVs[i] * width
				self.uvs[i + 1] = self.regionV + self.regionUVs[i + 1] * height
			end
		end
	end

	function self:computeWorldVertices (x, y, slot, worldVertices)
		local bone = slot.bone
		x = x + bone.worldX
		y = y + bone.worldY
		local m00, m01, m10, m11 = bone.m00, bone.m01, bone.m10, bone.m11
		local vertices = self.vertices
		local verticesCount = vertices.length
		if #slot.attachmentVertices == verticesCount then vertices = slot.attachmentVertices end
		for i = 1, verticesCount, 2 do
			local vx = vertices[i]
			local vy = vertices[i + 1]
			worldVertices[i] = vx * m00 + vy * m01 + x
			worldVertices[i + 1] = vx * m10 + vy * m11 + y
		end
	end

	return self
end
return MeshAttachment