Question

我在使用opengles创建帧缓冲区时遇到了一些问题。对于我的应用程序，我创建了这样的主帧缓冲区：

glGenFramebuffers( 1, &viewFramebuffer );
glGenRenderbuffers( 1, &viewRenderbuffer );

glBindFramebuffer( GL_FRAMEBUFFER, viewFramebuffer );
glBindRenderbuffer( GL_RENDERBUFFER, viewRenderbuffer );
[ Context renderbufferStorage : GL_RENDERBUFFER fromDrawable : ( CAEAGLLayer* )self.layer ];
glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, viewRenderbuffer );

glGetRenderbufferParameteriv( GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &backingWidth );
glGetRenderbufferParameteriv( GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &backingHeight );

if ( itUsesDepthBuffer )
{
    glGenRenderbuffers( 1, &depthRenderbuffer );
    glBindRenderbuffer( GL_RENDERBUFFER, depthRenderbuffer );
    glRenderbufferStorage( GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, backingWidth, backingHeight );
    glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthRenderbuffer );
}

if ( glCheckFramebufferStatus( GL_FRAMEBUFFER ) != GL_FRAMEBUFFER_COMPLETE )
{
    NSLog( @"failed to make complete framebuffer object %x", glCheckFramebufferStatus( GL_FRAMEBUFFER ) );
    [ self destroyFramebuffer ];

    return NO;
}

但函数glGetRenderbufferParameteriv为GL_RENDERBUFFER_WIDTH和GL_RENDERBUFFER_HEIGHT返回0，最终glCheckFramebufferStatus返回错误，因为framebuffer附件不完整。

你知道为什么会这样吗？

提前谢谢。

Answer 1

好的我修好了，它无法呈现缓冲区存储：

[ Context renderbufferStorage : GL_RENDERBUFFER fromDrawable : ( CAEAGLLayer* )self.layer ];

出于某种原因，我的“self.layer”没有返回正确的。

创建缓冲区OpenGLES 2

1 个答案: