void initProgram(){
  glUseProgram(this.program);
  viewMatrixUniform=glGetUniformLocation(this.program,"viewMatrix");
  projMatrixUniform=glGetUniformLocation(this.program,"projMatrix");
  viewportSizeUniform=glGetUniformLocation(this.program,"viewportSize");
  glUseProgram(0);
}

void initProgram ( ) { glUseProgram ( this . program ) ; viewMatrixUniform = glGetUniformLocation ( this . program , "viewMatrix" ) ; projMatrixUniform = glGetUniformLocation ( this . program , "projMatrix" ) ; viewportSizeUniform = glGetUniformLocation ( this . program , "viewportSize" ) ; glUseProgram ( 0 ) ; }
initialize the shader program .
