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标题: Unity3d运行时程序创建NGUI图集 - 转载 [打印本页]

作者: 狂风大尉 时间: 2014-11-24 01:41
标题: Unity3d运行时程序创建NGUI图集 - 转载

项目中UI经常要用到动态加载图片，比较简单的方法是使用UITexture控件，这样只用3W类下载好图片后直接给UITexture控件赋值就好了，缺点是DrawCall太高了，一个UITexture一个DrawCall，通常只有是背景图片这种才会使用UITexture控件，如果是下拉列表项，我们通常都是使用的UISprite控件，这时就需要我们在程序运行时，由程序创建图集，给UISprite控件使用。

请先看一下帖子：http://www.unitymanual.com/thread-16004-1-1.html
这帖子的第一种方法其实已经说明了如何在程序中创建图集，只不过他这里是使用一张图片做成图集，再给UISprite控件使用。
==================================================================
public class ImageLoader : MonoBehaviour {

//需要加载动态图片的对象

public UISprite m_img;

//自用的Atlas

private UIAtlas m_uiAtlas;

///

/// 加载的贴图

///

/// Tex.

public void ImageLoad(Texture2D tex)

{

if(tex == null)

{

return;

}

if(tex.name == m_img.spriteName)

{

return;

}

//准备对象和材质球

if(m_uiAtlas == null)

{

Material mat;

Shader shader = Shader.Find(“Unlit/Transparent Colored”);

mat = new Material(shader);

m_uiAtlas = this.gameObject.AddComponent();

m_uiAtlas.spriteMaterial = mat;

}

//设定贴图

m_uiAtlas.spriteMaterial.mainTexture = tex;

m_uiAtlas.coordinates = UIAtlas.Coordinates.Pixels;

//为对应UISprite接口，给Atlas加对象

UIAtlas.Sprite sprite = new UIAtlas.Sprite();

sprite.name = tex.name;

sprite.outer = sprite.inner = new Rect(0f, 0f, tex.width, tex.height);

m_uiAtlas.spriteList.Clear();

m_uiAtlas.spriteList.Add(sprite);

//设置完成

m_img.atlas = m_uiAtlas;

m_img.spriteName = tex.name;

}

}
============================================================
   我们工作中常常遇到的是需要将多张图片制作成一个图集，再给多个UISprite控件使用，其实看懂了上面的代码运行时如何生成图集，再结合平常在编辑器中制作图集，答案就已经出来了。请大家好好看看NGUI的编辑器脚本UIAtlasMaker，也就是我们平常在编辑器中制作图集时用的脚本。我们缺少的仅仅是将多张图片PackTextures（打包）成一张大图（也就是我们的图集啦），其实UIAtlasMaker脚本那么长，核心的操作也就是为了PackTextures，也就是unity3d的API里Texture2D.PackTextures函数，这里大家可以参考我以前转的别人的一篇关于该函数用法的文章：http://blog.sina.com.cn/s/blog_930ffa0b0102uyl8.html
和一篇别人分析UIAtlasMaker脚本的文章：http://dsqiu.iteye.com/blog/1967088
好了，最后就是我将UIAtlasMaker脚本里打包操作的函数拔出来后的工具类了，只有CreatAtlasFromTex这一个对外使用的函数。使用时只需要传人个UIAtlas组件和图片LIST就可以了，图集生成好后，UISprite控件就可以使用该动态图集了，这样好多个UISprite控件组成的下拉列表项只占一个DrawCall。
=============================CreatAtlas.cs=============================
using UnityEngine;
using System.Collections.Generic;

///
/// 运行时创建NGUI图集，NGUI2.6.3
///
public static class CreatAtlas {

class SpriteEntry {
      public Texture2D tex; // Sprite texture -- original texture or a temporary texture
      public Rect rect;       // Sprite's outer rectangle within the generated texture atlas
      public int minX = 0; // Padding, if any (set if the sprite is trimmed)
      public int maxX = 0;
      public int minY = 0;
      public int maxY = 0;
      public bool temporaryTexture = false; // Whether the texture is temporary and should be deleted
}

static Shader s_shader = Shader.Find("Unlit/Transparent Colored");
static Material s_mat = new Material(s_shader);
static int s_maximumAtlasSize = 2048;
static TextureFormat s_TextureFormat = TextureFormat.RGBA32;

static void Init ( UIAtlas uIAtlas ) {
      if ( uIAtlas.spriteMaterial == null ) {
         // 准备材质球
         uIAtlas.spriteMaterial = s_mat;
      }
}

///
/// 运行时创建NGUI图集，NGUI2.6.3
///
/// 使用该UIAtlas在运行时创建NGUI图集
/// 用雨创建图集的多张小图
public static void CreatAtlasFromTex ( UIAtlas uIAtlas, List textures ) {
      if ( null == textures || textures.Count <= 0 ) {
         Debug.LogWarning("textures is null or count <= 0 !!");
         return;
      }
      if ( null == uIAtlas ) {
         Debug.LogWarning("uIAtlas is null");
         return;
      } else {
         Init(uIAtlas);

         // 设定贴图，将小图映射为SpriteEntry
         List sprites = CreateSprites(textures);
         // 将多个小图PackTexture为一张大图，给图集用
         uIAtlas.spriteMaterial.mainTexture = UpdateTexture(uIAtlas, sprites);
         ReplaceSprites(uIAtlas, sprites);
      }
}

#region copy UIAtlasMaker编辑器脚本

static List CreateSprites (List textures) {
      List list = new List( );

      foreach (Texture tex in textures) {
         Texture2D oldTex = tex as Texture2D;
         if (oldTex == null) continue;
         // If we want to trim transparent pixels, there is more work to be done
         Color32[ ] pixels = oldTex.GetPixels32( );

         int xmin = oldTex.width;
         int xmax = 0;
         int ymin = oldTex.height;
         int ymax = 0;
         int oldWidth = oldTex.width;
         int oldHeight = oldTex.height;

         // Find solid pixels
         for (int y = 0, yw = oldHeight; y < yw; ++y) {
            for (int x = 0, xw = oldWidth; x < xw; ++x) {
                  Color32 c = pixels[y * xw + x];

                  if (c.a != 0) {
                     if (y < ymin) ymin = y;
                     if (y > ymax) ymax = y;
                     if (x < xmin) xmin = x;
                     if (x > xmax) xmax = x;
                  }
            }
         }

         int newWidth = (xmax - xmin) + 1;
         int newHeight = (ymax - ymin) + 1;

         // If the sprite is empty, don't do anything with it
         if (newWidth > 0 && newHeight > 0) {
            SpriteEntry sprite = new SpriteEntry( );
            sprite.rect = new Rect(0f, 0f, oldTex.width, oldTex.height);

            // If the dimensions match, then nothing was actually trimmed
            if (newWidth == oldWidth && newHeight == oldHeight) {
                  sprite.tex = oldTex;
                  sprite.temporaryTexture = false;
            } else {
                  // Copy the non-trimmed texture data into a temporary buffer
                  Color32[ ] newPixels = new Color32[newWidth * newHeight];

                  for (int y = 0; y < newHeight; ++y) {
                     for (int x = 0; x < newWidth; ++x) {
                        int newIndex = y * newWidth + x;
                        int oldIndex = (ymin + y) * oldWidth + (xmin + x);
                        newPixels[newIndex] = pixels[oldIndex];
                     }
                  }

                  // Create a new texture
                  sprite.temporaryTexture = true;
                  sprite.tex = new Texture2D(newWidth, newHeight);
                  sprite.tex.name = oldTex.name;
                  sprite.tex.SetPixels32(newPixels);
                  sprite.tex.Apply( );

                  // Remember the padding offset
                  sprite.minX = xmin;
                  sprite.maxX = oldWidth - newWidth - xmin;
                  sprite.minY = ymin;
                  sprite.maxY = oldHeight - newHeight - ymin;
            }
            list.Add(sprite);
         }
      }
      return list;
}

static Texture2D UpdateTexture (UIAtlas atlas, List sprites) {

      Texture2D tex = new Texture2D(1, 1, s_TextureFormat, false);
      PackTextures(tex, sprites);
      atlas.spriteMaterial.mainTexture = tex;
      return tex;
}

static void PackTextures (Texture2D tex, List sprites) {
      Texture2D[ ] textures = new Texture2D[sprites.Count];
      for (int i = 0; i < sprites.Count; ++i) textures = sprites.tex;

      Rect[ ] rects = tex.PackTextures(textures, 1, s_maximumAtlasSize);

      for (int i = 0; i < sprites.Count; ++i) {
         sprites.rect = NGUIMath.ConvertToPixels(rects, tex.width, tex.height, true);
      }
}

static void ReplaceSprites (UIAtlas atlas, List sprites) {
      // Get the list of sprites we'll be updating
      List spriteList = atlas.spriteList;
      List kept = new List( );

      // The atlas must be in pixels
      atlas.coordinates = UIAtlas.Coordinates.Pixels;

      // Run through all the textures we added and add them as sprites to the atlas
      for (int i = 0; i < sprites.Count; ++i) {
         SpriteEntry se = sprites;
         UIAtlas.Sprite sprite = AddSprite(spriteList, se);
         kept.Add(sprite);
      }

      // Remove unused sprites
      for (int i = spriteList.Count; i > 0; ) {
         UIAtlas.Sprite sp = spriteList[--i];
         if (!kept.Contains(sp)) spriteList.RemoveAt(i);
      }
      atlas.MarkAsDirty( );
}

static UIAtlas.Sprite AddSprite (List sprites, SpriteEntry se) {
      UIAtlas.Sprite sprite = null;

      // See if this sprite already exists
      foreach (UIAtlas.Sprite sp in sprites) {
         if (sp.name == se.tex.name) {
            sprite = sp;
            break;
         }
      }

      if (sprite != null) {
         float x0 = sprite.inner.xMin - sprite.outer.xMin;
         float y0 = sprite.inner.yMin - sprite.outer.yMin;
         float x1 = sprite.outer.xMax - sprite.inner.xMax;
         float y1 = sprite.outer.yMax - sprite.inner.yMax;

         sprite.outer = se.rect;
         sprite.inner = se.rect;

         sprite.inner.xMin = Mathf.Max(sprite.inner.xMin + x0, sprite.outer.xMin);
         sprite.inner.yMin = Mathf.Max(sprite.inner.yMin + y0, sprite.outer.yMin);
         sprite.inner.xMax = Mathf.Min(sprite.inner.xMax - x1, sprite.outer.xMax);
         sprite.inner.yMax = Mathf.Min(sprite.inner.yMax - y1, sprite.outer.yMax);
      } else {
         sprite = new UIAtlas.Sprite( );
         sprite.name = se.tex.name;
         sprite.outer = se.rect;
         sprite.inner = se.rect;
         sprites.Add(sprite);
      }

      float width = Mathf.Max(1f, sprite.outer.width);
      float height = Mathf.Max(1f, sprite.outer.height);

      // Sprite's padding values are relative to width and height
      sprite.paddingLeft = se.minX / width;
      sprite.paddingRight = se.maxX / width;
      sprite.paddingTop = se.maxY / height;
      sprite.paddingBottom = se.minY / height;
      return sprite;
}

#endregion copy UIAtlasMaker编辑器脚本

}

作者: heise 时间: 2014-11-24 01:50
感谢分享1

作者: hyui 时间: 2014-11-24 02:27
cool code !!

作者: hariboot 时间: 2014-11-24 11:55
但是有个问题，虽然DC是低了，但是内存高了，如果大量的碎图都不同，而里面的一些图片不用同时加载的话，还是宁愿牺牲DC换内存来的好

作者: vincent_d 时间: 2014-12-26 14:21
图集制作的时候，prefab如何关联那些sprite

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