1

我正在制作一个绘画应用程序。我想更改延音以添加重做和撤消功能。但是渲染后我无法制作完整的帧缓冲区。

CAEAGLLayer* pGLLayer = ( CAEAGLLayer* )self.layer;
pGLLayer.opaque = YES;
pGLLayer.drawableProperties = [ NSDictionary dictionaryWithObjectsAndKeys:[ NSNumber numberWithBool:YES ],
                                                                 kEAGLDrawablePropertyRetainedBacking,
                                                                 kEAGLColorFormatRGBA8,
                                                                 kEAGLDrawablePropertyColorFormat,
                                                                                                                                     nil ];     
mpGLContext = [ [EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES1 ];
[ EAGLContext setCurrentContext:mpGLContext ];
glGenFramebuffers( 1, &FrameBuffer );
glBindFramebuffer( GL_FRAMEBUFFER, FrameBuffer );   
glGenRenderbuffers( 1, &firstColorBuffer );
glBindRenderbuffer( GL_RENDERBUFFER, firstColorBuffer );
[ mpGLContext renderbufferStorage:GL_RENDERBUFFER fromDrawable:( CAEAGLLayer* )self.layer ];
glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, firstColorBuffer );
glOrthof( 0.0f, 320.0f, 480.0f, 0.0f, 0.5f, -0.5f );
glViewport( 0, 0, 320, 480 );

    // here status is GL_FRAMEBUFFER_COMPLETE
    GLenum status = glCheckFramebufferStatus( GL_FRAMEBUFFER );

/** render function  **/
glGenRenderbuffers( 1, &secondColorBuffer );
glBindRenderbuffer( GL_RENDERBUFFER, secondColorBuffer );
[ mpGLContext renderbufferStorage:GL_RENDERBUFFER fromDrawable:( CAEAGLLayer* )self.layer ];
glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, firstColorBuffer );

// here status is GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_OES
GLenum status = glCheckFramebufferStatus( GL_FRAMEBUFFER );

glCheckFramebufferStatus 返回 GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_OES。但是我绑定了渲染缓冲区。所以有一个framebuffer的附件。我应该在这段代码中修复什么来制作完整的帧缓冲区。

4

1 回答 1

0

尝试更换通话后/** render function **/

glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, firstColorBuffer );

和

glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, secondColorBuffer );

您要附加firstColorBuffer两次，根据文档，最终附件损坏：

当前绑定的帧缓冲区对象的附件逻辑缓冲区的任何先前附件都被破坏。

于 2013-04-05T18:49:22.847 回答