Java-Android Opengl ES 2.0 FrameBuffer无法正常工作

概述我正在研究2DAndroid项目,我希望使用FBO将东西绘制为空纹理,然后在屏幕上绘制该纹理.出于调试目的,FBO附加的纹理应立即变为蓝色,因此我可以编辑该纹理,因为当前它甚至不会影响该纹理.帧缓冲区：publicstaticclassFrameBuffer{privatefinalFaustEngineengine;pr

我正在研究2D Android项目,我希望使用FBO将东西绘制为空纹理,然后在屏幕上绘制该纹理.出于调试目的,FBO附加的纹理应立即变为蓝色,因此我可以编辑该纹理,因为当前它甚至不会影响该纹理.

帧缓冲区：

public static class FrameBuffer{    private final FaustEngine engine;    private final int wIDth;    private final int height;    private final int[] fboID = new int[1];    private final int[] renID = new int[1];    public FrameBuffer( FaustEngine Engine, int WIDth, int Height ){        engine = Engine;        wIDth = WIDth;        height = Height;        GLES20.glGenRenderbuffers( 1, renID, 0 );        GLES20.glBindRenderbuffer( GLES20.GL_RENDERBUFFER, renID[0] );        GLES20.glrenderbufferStorage( GLES20.GL_RENDERBUFFER, GLES20.GL_DEPTH_COMPONENT, wIDth, height );        GLES20.glGenFramebuffers( 1, fboID, 0 );        GLES20.glBindFramebuffer( GLES20.GL_FRAMEBUFFER, fboID[0] );        GLES20.glFramebufferRenderbuffer( GLES20.GL_FRAMEBUFFER, GLES20.GL_DEPTH_ATTACHMENT, GLES20.GL_RENDERBUFFER, renID[0] );        GLES20.glBindRenderbuffer( GLES20.GL_RENDERBUFFER, 0);        GLES20.glBindFramebuffer( GLES20.GL_FRAMEBUFFER, 0);    }    public voID bind( int texID, int texWIDth, int texHeight ){        GLES20.glBindFramebuffer( GLES20.GL_FRAMEBUFFER, fboID[0] );        GLES20.glFramebufferTexture2D( GLES20.GL_FRAMEBUFFER, GLES20.GL_color_ATTACHMENT0, GLES20.GL_TEXTURE_2D, texID, 0 );        GLES20.glVIEwport( 0, 0, texWIDth, texHeight );        GLES20.glClearcolor(0f, 0f, 1f, 1f );        GLES20.glClear( GLES20.GL_color_BUFFER_BIT ); //Turn blue        //Fix projection matrix        Matrix.orthoM( engine.getorthoMatrix() , 0, 0, texWIDth, texHeight, 0, -1, 1 );    }    public voID unbind(){        GLES20.glBindFramebuffer( GLES20.GL_FRAMEBUFFER, 0 );        GLES20.glVIEwport( 0, 0, engine.getScreenWIDth(), engine.getScreenHeight() );        //@R_301_5990@ projection matrix        Matrix.orthoM( engine.getorthoMatrix() , 0, 0, engine.getScreenWIDth(), engine.getScreenHeight(), 0, -1, 1 );    }}

渲染代码：

FrameBuffer fbo = new FrameBuffer( game.getEngine(), 1024, 1024 );final int[] texIDs = new int[1];game.getEngine().createBlankTextures( texIDs, 1024, 1024 );fbo.bind( texIDs[0], 1024, 1024 );//texture should turn blue here since in the bind() function I placed a glClear with bluefbo.unbind();

纹理创建：

public voID createBlankTextures( int[] texIDs, int wIDth, int height ){    GLES20.glGenTextures( texIDs.length, texIDs, 0 );    for( int i=0; i<texIDs.length; i++ ){        GLES20.glBindTexture( GLES20.GL_TEXTURE_2D, texIDs[i] );        GLES20.glTexParameteri( GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST );        GLES20.glTexParameteri( GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST );        GLES20.glTexImage2D( GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA, wIDth, height, 0, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, null );        GLES20.glGenerateMipmap( GLES20.GL_TEXTURE_2D );    }}

所以我有两个问题.

1.)我需要带有帧缓冲区的渲染缓冲区吗？我不想跟踪深度.我只想编辑一个现有的纯2D纹理.

2.)为什么不起作用？

解决方法:

如果不需要FBO渲染的深度缓冲区,则无需创建渲染缓冲区.

对于ES 2.0中的glrenderbufferStorage()的internalformat参数,GL_DEPTH_COMPONENT不是有效值.如果查看支持的值(http://www.khronos.org/opengles/sdk/docs/man/xhtml/glRenderbufferStorage.xml),则唯一的深度格式是GL_DEPTH_COMPONENT16.

与往常一样,glGetError()是您的朋友.它应该从glrenderbufferStorage()调用中指示GL_INVALID_ENUM错误.

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