Multi-threaded OpenGL sharing context under Android (i)

Last Update:2017-05-23 Source: Internet

Author: User

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recently, using Java plugin for texture updates in research Unity3d development, The idea is simple to update the texture data in a Java thread, and then the textures in the unity scene will be updated automatically.first, Create a Java class, define an interface to create textures and get texture parameters, and create OpenGL operations such as a single-thread pool for loading bitmap and binding texture Data. Java Code example:<pre>1 packagecom.thornbirds.unity;2 3 Importandroid.graphics.Bitmap;4 Importandroid.graphics.BitmapFactory;5 Importandroid.opengl.GLES11Ext;6 Importandroid.opengl.GLES20;7 Importandroid.opengl.GLUtils;8 Importandroid.util.Log;9 Ten Importjava.util.concurrent.ExecutorService; one Importjava.util.concurrent.Executors; a - public classPlugintexture { - Private Static FinalString TAG = "plugintexture"; the Private intMtextureid = 0; - Private intMtexturewidth = 0; - Private intMtextureheight = 0; - + //Create a single thread pool for processing OpenGL textures - Private FinalExecutorservice Mrenderthread =Executors.newsinglethreadexecutor (); + a public intgetstreamtexturewidth () { at returnmtexturewidth; - } - - public intgetstreamtextureheight () { - returnmtextureheight; - } in - public intGetstreamtextureid () { to returnmtextureid; + } - the publicplugintexture () { * } $ Panax Notoginseng public voidSetupopengl () { -Mrenderthread.execute (NewRunnable () { the @Override + public voidRun () { a //generate OpenGL Texture ID the inttextures[] =New int[1]; +Gles20.glgentextures (1, textures, 0); - if(textures[0] = = 0) { $LOG.E (TAG, "glgentextures failed"); $ return; - } -Mtextureid = Textures[0]; theMtexturewidth = 640; -Mtextureheight = 360;Wuyi } the }); - } wu - public voidupdatetexture () { aboutMrenderthread.execute (NewRunnable () { $ @Override - public voidRun () { -String Imagefilepath = "/sdcard/test/image.png"; - FinalBitmap Bitmap =bitmapfactory.decodefile (imagefilepath); a + gles20.glbindtexture (gles20.gl_texture_2d, mtextureid); the gles20.gltexparameteri (gles11ext.gl_texture_external_oes, gles20.gl_texture_min_filter, GLES20.GL_NEAR EST); - gles20.gltexparameteri (gles11ext.gl_texture_external_oes, gles20.gl_texture_mag_filter, GLES20.GL_NEAR EST); $Glutils.teximage2d (gles20.gl_texture_2d, 0, bitmap, 0); theGles20.glbindtexture (gles20.gl_texture_2d, 0); the the bitmap.recycle (); the } - }); in } the the public voidDestroy () { about Mrenderthread.shutdownnow (); the } the}</pre>then, Create a C # script, Instantiate the Java object in the script, and invoke the Java method to initialize opengl; to show the updated texture, you need to get the texture ID generated by Java and bind it to the current gameobject of the Script. C # code Example:<pre>1 public classPlugintesturedemo:monobehaviour {2 PrivateAndroidjavaobject mplugintexture;3 Private intmtextureid;4 Private intmwidth;5 Private intmheight;6 7 voidStart () {8 //instantiating an object of the Com.thornbirds.unity.PluginTexture class9Mplugintexture =NewAndroidjavaobject ("com.thornbirds.unity.PluginTexture");Ten //initializing OpenGL oneMplugintexture.call ("Setupopengl"); a } - - voidbindtexture () { the //gets the javaplugin generated texture ID -Mtextureid = mplugintexture.call<int> ("Getplugintextureid"); - if(mtextureid = =0) { -Debug.logerror ("Getplugintextureid failed"); + return; - } +Mwidth = mplugintexture.call<int> ("Getplugintexturewidth"); aMheight = mplugintexture.call<int> ("Getplugintextureheight"); at //binds the texture ID to the current gameobject -getcomponent<meshrenderer> (). material.maintexture =texture2d.createexternaltexture -(mwidth, mheight, textureformat.argb32,false,false, (IntPtr) mtextureid); - //Update texture Data -Mplugintexture.call ("updatetexture"); - } in}</pre>Note: the Java method is called in C # using the method name, so it is necessary to prevent the Java class and its public methods from being confused when compiling the jar Package. Add the following code to the Proguard file:<pre><pre>1 class com.thornbirds.unity.PluginTexture {2public *; 3 }</pre></pre>There is a problem with this scenario, in the Java thread access to OpenGL operation, will be reported missing glcontext, need to initialize the OpenGL drawing environment for Java THREAD. Continue Next.Multi-threaded OpenGL sharing context under Android (i)

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