code: func GetTextureImage(texture uint32, level int32, format uint32, xtype uint32, bufSize int32, pixels unsafe.Pointer) {
  	C.glowGetTextureImage(gpGetTextureImage, (C.GLuint)(texture), (C.GLint)(level), (C.GLenum)(format), (C.GLenum)(xtype), (C.GLsizei)(bufSize), pixels)
  }
docs: // return a texture image