code: func ClearTexImage(texture uint32, level int32, format uint32, xtype uint32, data unsafe.Pointer) {
  	C.glowClearTexImage(gpClearTexImage, (C.GLuint)(texture), (C.GLint)(level), (C.GLenum)(format), (C.GLenum)(xtype), data)
  }
docs: // fills all a texture image with a constant value