GL_ARB_invalidate_subdata
http://www.opengl.org/registry/specs/ARB/invalidate_subdata.txt
GL_ARB_invalidate_subdata
	void glInvalidateBufferData (GLuint buffer)
	void glInvalidateBufferSubData (GLuint buffer, GLintptr offset, GLsizeiptr length)
	void glInvalidateFramebuffer (GLenum target, GLsizei numAttachments, const GLenum* attachments)
	void glInvalidateSubFramebuffer (GLenum target, GLsizei numAttachments, const GLenum* attachments, GLint x, GLint y, GLsizei width, GLsizei height)
	void glInvalidateTexImage (GLuint texture, GLint level)
	void glInvalidateTexSubImage (GLuint texture, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth)
