opengl Framebuffer is incomplete: No attachments and default size is zero 问题解决
GL_INVALID_FRAMEBUFFER_OPERATION:Framebufferisincomplete:Noattachmentsanddefaultsizeiszero.这个framebuffer错误的一个原因是:voidglFramebufferTexture2D(GLenumtarget,GLenumattachment,GLenumtextarget,GLuinttexture,