在 opengl es 2.0 iphone 中使用深度缓冲区

发布于 2024-09-29 18:05:56 字数 1662 浏览 6 评论 0原文

我遵循了在 opengl es 1.1 中使用深度缓冲区的教程。但我用的是opengl es 2.0。实现的代码会导致错误：无法制作完整的帧缓冲区对象 8cd6。请参阅下面的实现代码：

 (void)createFramebuffer
{
   if (context && !defaultFramebuffer)
   {
        [EAGLContext setCurrentContext:context];

        // Create default framebuffer object.
        glGenFramebuffers(1, &defaultFramebuffer);
        glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);

        // Create color render buffer and allocate backing store.
        glGenRenderbuffers(1, &colorRenderbuffer);
        glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);

        // Create depth render buffer
        glGenRenderbuffers(1, &depthRenderbuffer);
        glBindRenderbuffer(GL_RENDERBUFFER, depthRenderbuffer);

        [context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer *)self.layer];
        glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &framebufferWidth);
        glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &framebufferHeight);

        glBindRenderbuffer(GL_RENDERBUFFER, depthRenderbuffer);
        glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, framebufferWidth, framebufferHeight);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorRenderbuffer);
    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));
    }
}

问候尼克拉斯

原文

I followed a tutorial using depth buffer in opengl es 1.1. But I use opengl es 2.0. The implemented code results in an error: Failed to make complete framebuffer object 8cd6.
See implemented code below:

 (void)createFramebuffer
{
   if (context && !defaultFramebuffer)
   {
        [EAGLContext setCurrentContext:context];

        // Create default framebuffer object.
        glGenFramebuffers(1, &defaultFramebuffer);
        glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer);

        // Create color render buffer and allocate backing store.
        glGenRenderbuffers(1, &colorRenderbuffer);
        glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer);

        // Create depth render buffer
        glGenRenderbuffers(1, &depthRenderbuffer);
        glBindRenderbuffer(GL_RENDERBUFFER, depthRenderbuffer);

        [context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer *)self.layer];
        glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &framebufferWidth);
        glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &framebufferHeight);

        glBindRenderbuffer(GL_RENDERBUFFER, depthRenderbuffer);
        glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, framebufferWidth, framebufferHeight);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, colorRenderbuffer);
    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));
    }
}

Regards
Niclas

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海未深 2024-10-06 18:05:56

问题是您两次将存储绑定到深度渲染缓冲区，而不是绑定到颜色渲染缓冲区。发送到 EAGLContext 的 -renderbufferStorage:fromDrawable: 消息将存储绑定到当前绑定的渲染缓冲区，在您的情况下是深度渲染缓冲区。接下来，您将使用 glRenderbufferStorage 调用再次将存储绑定到它。

解决方案是在发送存储消息之前绑定颜色渲染缓冲区，以便存储与其绑定。也就是说，在创建深度渲染缓冲区后，在消息上方直接插入一行 glBindRenderbuffer(GL_RENDERBUFFER, colorRenderbuffer); 。它应该有效，我能够重现您的错误并随后以这种方式解决它。

注意。始终确保绑定了正确的缓冲区。您可以使用 glGetIntegerv() 检查绑定，并使用 glGetRenderbufferParameteriv() 检查其他参数。