Question

我在我的OpenGL代码中使用FBO，我在GL\_FRAMEBUFFER\_INCOMPLETE\_DUPLICATE\_ATTACHMENT\_EXT上看到了编译错误。造成这种情况的原因是什么？如何解决？

Answer 1

此错误的原因是NVIDIA的 glext.h 的旧版本，它仍然具有此定义。而GLEW的最新版本却没有。这会导致您之前编写或从Web获取的代码中出现编译错误。

FBO的 GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT 定义曾出现在规范中（因此也存在于头文件中）。但是，它后来被删除了。可以在FBO extension specification（查找问题87）中找到原因：

(87) What happens if a single image is attached more than once to a
     framebuffer object?

     RESOLVED: The value written to the pixel is undefined.

     There used to be a rule in section 4.4.4.2 that resulted in
     FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT if a single
     image was attached more than once to a framebuffer object.

         FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT   0x8CD8

         * A single image is not attached more than once to the
           framebuffer object.

           { FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT }

     This rule was removed in version #117 of the
     EXT_framebuffer_object specification after discussion at the
     September 2005 ARB meeting.  The rule essentially required an
     O(n*lg(n)) search.  Some implementations would not need to do that
     search if the completeness rules did not require it.  Instead,
     language was added to section 4.10 which says the values
     written to the framebuffer are undefined when this rule is
     violated.

要修复此错误，请从代码中删除 GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT 的所有用法。

如果您的设置无法做到这一点，请在 glext.h 或 glew.h 文件中添加虚拟定义，如下所示：

#define GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT 0x8CD8

GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT错误

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