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：
1 package com.fxb.newtest; 2 3 import com.badlogic.gdx.ApplicationAdapter; 4 import com.badlogic.gdx.Gdx; 5 import com.badlogic.gdx.graphics.GL10; 6 import com.badlogic.gdx.graphics.Pixmap; 7 import com.badlogic.gdx.graphics.Pixmap.Format; 8 import com.badlogic.gdx.graphics.Texture.TextureFilter; 9 import com.badlogic.gdx.graphics.g2d.PixmapPacker; 10 import com.badlogic.gdx.graphics.g2d.SpriteBatch; 11 import com.badlogic.gdx.graphics.g2d.TextureAtlas; 12 import com.badlogic.gdx.graphics.g2d.TextureRegion; 13 14 public class Lib019_TexturePack extends ApplicationAdapter{ 15 16 TextureAtlas atlas; 17 TextureRegion region1, region2; 18 SpriteBatch batch; 19 20 @Override 21 public void create() { 22 // TODO Auto-generated method stub 23 super.create(); 24 25 PixmapPacker packer = new PixmapPacker( 512, 512, Format.RGB565, 2, true ); 26 //packer.pack( "first", pixmap1 ); 27 Pixmap pixmap1 = new Pixmap( Gdx.files.internal( "data/badlogic.jpg" ) ); 28 Pixmap pixmap2 = new Pixmap( Gdx.files.internal( "data/pal4_1.jpg" ) ); 29 packer.pack( "first", pixmap1 ); 30 packer.pack( "second", pixmap2 ); 31 32 atlas = packer.generateTextureAtlas( TextureFilter.Nearest, TextureFilter.Nearest, false ); 33 region1 = atlas.findRegion( "first" ); 34 region2 = atlas.findRegion( "second" ); 35 36 pixmap1.dispose(); 37 pixmap2.dispose(); 38 39 batch = new SpriteBatch(); 40 } 41 42 @Override 43 public void render() { 44 // TODO Auto-generated method stub 45 super.render(); 46 Gdx.gl.glClearColor( 0, 1, 1, 1 ); 47 Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT ); 48 49 batch.begin(); 50 batch.draw( region1, 10, 10 ); 51 batch.draw( region2, 20+region1.getRegionWidth(), 10 ); 52 batch.end(); 53 54 } 55 56 @Override 57 public void dispose() { 58 // TODO Auto-generated method stub 59 atlas.dispose(); 60 super.dispose(); 61 } 62 63 }
运行结果：
