GL_ARB_clear_buffer_object
http://www.opengl.org/registry/specs/gl/ARB/clear_buffer_object.txt
GL_ARB_clear_buffer_object
	void glClearBufferData (GLenum target, GLenum internalformat, GLenum format, GLenum type, const GLvoid* data)
	void glClearBufferSubData (GLenum target, GLenum internalformat, GLintptr offset, GLsizeiptr size, GLenum format, GLenum type, const GLvoid* data)
	void glClearNamedBufferDataEXT (GLuint buffer, GLenum internalformat, GLenum format, GLenum type, const GLvoid* data)
	void glClearNamedBufferSubDataEXT (GLuint buffer, GLenum internalformat, GLintptr offset, GLsizeiptr size, GLenum format, GLenum type, const GLvoid* data)