private static void GeneratePackTextureImpl(CNode node, ref PackTextureAttrSet packTextureAttrSet)
{
if (node != null &&
packTextureAttrSet != null &&
packTextureAttrSet.packTexture)
{
if (node.IsFilled)
{
TextureVertexAttr attri = node.refTextureInfo;
CalcVertexAtrribute(
packTextureAttrSet.packTexWidth,
packTextureAttrSet.packTexHeight,
ref attri
);
packTextureAttrSet.texVertexAttrList.Add(attri);
Fill2PackTexture(packTextureAttrSet.packTexture, attri);
}
if (node.leftChild != null)
{
GeneratePackTextureImpl(node.leftChild, ref packTextureAttrSet);
}
if (node.rightChild != null)
{
GeneratePackTextureImpl(node.rightChild, ref packTextureAttrSet);
}
}
}
public CNode Insert(Texture2D texture)
{
CNode retNode = null;
if (texture != null)
{
int texWidth = texture.width;
int texHeight = texture.height;
if (!IsLeaf) //不是叶子结点了
{
if (leftChild != null)
{
retNode = leftChild.Insert(texture);
}
if (retNode == null &&
rightChild != null)
{
retNode = rightChild.Insert(texture);
}
}
else
{
bool bNeedFliped = false;
if (IsFilled)
{
retNode = null;
}
else if (CanFillIn(texWidth, texHeight, out bNeedFliped))
{
bool bPerfectFillIn = bNeedFliped ?
CanPerfectFillIn(texHeight, texWidth) :
CanPerfectFillIn(texWidth, texHeight);
//如果完美匹配
if (bPerfectFillIn)
{
retNode = this;
Fill(ref retNode, texture, bNeedFliped);
}
else
{
int fillWidth = (bNeedFliped ? texHeight : texWidth);
int fillHeight = (bNeedFliped ? texWidth : texHeight);
SplitNode(fillWidth, fillHeight, out leftChild, out rightChild);
if (leftChild != null)
{
retNode = leftChild.Insert(texture);
}
}
}
}
}
return(retNode);
}
private void Fill(ref CNode retNode, Texture2D texture, bool bNeedFliped)
{
if (retNode != null)
{
string assetPath = AssetDatabase.GetAssetPath(texture);
retNode.refTextureInfo.blockDetail.IsFilped = bNeedFliped; //翻转的
retNode.refTextureInfo.refSprite = AssetDatabase.LoadAssetAtPath(assetPath, typeof(Sprite)) as Sprite;
retNode.refTextureInfo.refTexture = texture;
retNode.refTextureInfo.szGUID = AssetDatabase.AssetPathToGUID(assetPath);
retNode.refTextureInfo.spriteName = Path.GetFileNameWithoutExtension(assetPath);
}
}
private static void GeneratePackTexture(CNode root, out PackTextureAttrSet outPackTextureAttrSet)
{
outPackTextureAttrSet = null;
if (root != null)
{
outPackTextureAttrSet = ScriptableObject.CreateInstance <PackTextureAttrSet>();
outPackTextureAttrSet.texVertexAttrList = new List <TextureVertexAttr>();
//后面的格式指定
outPackTextureAttrSet.packTexture = new Texture2D(root.refTextureInfo.blockDetail.rect.w, root.refTextureInfo.blockDetail.rect.h, TextureFormat.RGBA32, false);
SetDefaultColor(ref outPackTextureAttrSet.packTexture, mDefaultColor);
GeneratePackTextureImpl(root, ref outPackTextureAttrSet);
}
}
//随便的算法，不是最优的
public static CNode GenerateRootNode(Texture2D[] splitTexs, int packTexWidth, int packTexHeight)
{
CNode rootNode = null;
if (splitTexs != null)
{
//统计一下所有图片的总像素数量
//找出最长的宽和高
int pixelCnt = 0;
int maxWidth = 0;
int maxHeight = 0;
for (int i = 0; i < splitTexs.Length; ++i)
{
int tWidth = splitTexs[i].width;
int tHeight = splitTexs[i].height;
pixelCnt += tWidth * tHeight;
if (tWidth > maxWidth)
{
maxWidth = tWidth;
}
if (tHeight > maxHeight)
{
maxHeight = tHeight;
}
}
int packTexSize = packTexWidth * packTexHeight;
if (packTexSize >= pixelCnt)
{
if ((packTexWidth >= maxWidth && packTexHeight >= maxHeight) ||
(packTexWidth >= maxHeight && packTexHeight >= maxWidth))
{
rootNode = new CNode();
rootNode.refTextureInfo.blockDetail.rect.Set(0, 0, packTexWidth, packTexHeight);
}
else
{
Debug.LogError("width or height too small");
}
}
else
{
Debug.LogError("Size too small");
}
}
return(rootNode);
}
private void SplitNode(int fillWidth, int fillHeight, out CNode outLeftChild, out CNode outRightChild)
{
outLeftChild = new CNode();
outRightChild = new CNode();
int dw = refTextureInfo.blockDetail.rect.w - fillWidth;
int dh = refTextureInfo.blockDetail.rect.h - fillHeight;
if (dw >= dh) //左右分割
{
outLeftChild.refTextureInfo.blockDetail.rect.Set(
refTextureInfo.blockDetail.rect.x,
refTextureInfo.blockDetail.rect.y,
fillWidth,
refTextureInfo.blockDetail.rect.h
);
outRightChild.refTextureInfo.blockDetail.rect.Set(
refTextureInfo.blockDetail.rect.x + fillWidth,
refTextureInfo.blockDetail.rect.y,
dw,
refTextureInfo.blockDetail.rect.h
);
}
else //上下分割
{
outLeftChild.refTextureInfo.blockDetail.rect.Set(
refTextureInfo.blockDetail.rect.x,
refTextureInfo.blockDetail.rect.y,
refTextureInfo.blockDetail.rect.w,
fillHeight
);
outRightChild.refTextureInfo.blockDetail.rect.Set(
refTextureInfo.blockDetail.rect.x,
refTextureInfo.blockDetail.rect.y + fillHeight,
refTextureInfo.blockDetail.rect.w,
dh
);
}
}
public static void Pack(Texture2D[] splitTexs, int width, int height, out PackTextureAttrSet outPackTextureAttrSet)
{
outPackTextureAttrSet = null;
if (splitTexs != null)
{
SortTexture(ref splitTexs);
CNode rootNode = GenerateRootNode(splitTexs, width, height);
if (rootNode != null)
{
//插一插
for (int i = 0; i < splitTexs.Length; ++i)
{
if (rootNode.Insert(splitTexs[i]) == null)
{
string assetPath = AssetDatabase.GetAssetPath(splitTexs[i]);
Debug.LogWarning(string.Format("no suitable area:{0}", assetPath));
}
}
//遍历一下节点树生成图集
GeneratePackTexture(rootNode, out outPackTextureAttrSet);
}
}
}
