iphone - 使用深度渲染缓冲区有什么问题？ OpenGL ES 2.0

我使用以下代码：

context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];

    if (!context || ![EAGLContext setCurrentContext:context] || ![self loadShaders])
    {
        [self release];
        return nil;
    }

    glGenFramebuffers(1, &defaultFramebuffer);
    glGenRenderbuffers(1, &colorRenderbuffer);
    glGenRenderbuffers(1, &depthRenderbuffer);

    glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);
    glBindRenderbuffer(GL_RENDERBUFFER, depthRenderbuffer);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorRenderbuffer);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthRenderbuffer);

    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

但是，当我运行该应用程序时，我看到紫屏吗？此代码有什么问题？

最佳答案

我看不到将颜色渲染缓冲区绑定到要显示在其上的CAEAGLLayer的位置（尽管稍后可能会发生），并且我也看不到启用深度测试。另外，如果我没记错的话，您需要绑定颜色渲染缓冲区，为此调用glFramebufferRenderbuffer()，然后绑定深度渲染缓冲区并再次调用它。

以下是我用来在OpenGL ES 2.0上设置类似显示的代码：

glEnable(GL_DEPTH_TEST);

glGenFramebuffers(1, &viewFramebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, viewFramebuffer);

glGenRenderbuffers(1, &viewRenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, viewRenderbuffer);

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

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

glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, viewRenderbuffer);

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(@"Failure with framebuffer generation");
    return NO;
}

此应用程序的完整代码位于here中。