code: func GetShaderSource(shader uint32, bufSize int32, length *int32, source *uint8) {
  	C.glowGetShaderSource(gpGetShaderSource, (C.GLuint)(shader), (C.GLsizei)(bufSize), (*C.GLsizei)(unsafe.Pointer(length)), (*C.GLchar)(unsafe.Pointer(source)))
  }
docs: // Returns the source code string from a shader object