libgdx学习记录19——图片动态打包PixmapPacker

libgdx中，opengl 1.x要求图片长宽必须为2的整次幂，一般有如下解决方法

1. 将opengl 1.x改为opengl 2.0。（libgdx 1.0版本后不支持1.x，当然不存在这个问题，这里针对的是0.9.9版本）

2. 使用TexturePacker将图片打包好然后作成一张大图添加进来。

第二种方法是常用方法，但是不太灵活，添加、删除某些图片不太方便，改动较大。这里可以考虑使用PixmapPacker将图片进行动态打包。

主要方法：

pack(String name, Pixmap pixmap) 打包某个图片，并制定名称

generateAtlas( TextureFilter minFilter, TextureFilter magFilter, boolean useMipMap ) 生成图片资源包

示例代码：

 package com.fxb.newtest;

 import com.badlogic.gdx.ApplicationAdapter;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.graphics.GL10;
 import com.badlogic.gdx.graphics.Pixmap;
 import com.badlogic.gdx.graphics.Pixmap.Format;
 import com.badlogic.gdx.graphics.Texture.TextureFilter;
 import com.badlogic.gdx.graphics.g2d.PixmapPacker;
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
 import com.badlogic.gdx.graphics.g2d.TextureAtlas;
 import com.badlogic.gdx.graphics.g2d.TextureRegion;

 public class Lib019_TexturePack extends ApplicationAdapter{

     TextureAtlas atlas;
     TextureRegion region1, region2;
     SpriteBatch batch;

     @Override
     public void create() {
         // TODO Auto-generated method stub
         super.create();

         PixmapPacker packer = new PixmapPacker( 512, 512, Format.RGB565, 2, true );
         //packer.pack( "first", pixmap1 );
         Pixmap pixmap1 = new Pixmap( Gdx.files.internal( "data/badlogic.jpg" ) );
         Pixmap pixmap2 = new Pixmap( Gdx.files.internal( "data/pal4_1.jpg" ) );
         packer.pack( "first", pixmap1 );
         packer.pack( "second", pixmap2 );

         atlas = packer.generateTextureAtlas( TextureFilter.Nearest, TextureFilter.Nearest, false );
         region1 = atlas.findRegion( "first" );
         region2 = atlas.findRegion( "second" );

         pixmap1.dispose();
         pixmap2.dispose();

         batch = new SpriteBatch();
     }

     @Override
     public void render() {
         // TODO Auto-generated method stub
         super.render();
         Gdx.gl.glClearColor( 0, 1, 1, 1 );
         Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT );

         batch.begin();
         batch.draw( region1, 10, 10 );
         batch.draw( region2, 20+region1.getRegionWidth(), 10 );
         batch.end();

     }

     @Override
     public void dispose() {
         // TODO Auto-generated method stub
         atlas.dispose();
         super.dispose();
     }

 }

运行结果：