用OpenGL加载图像并在图像上画网格

glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

Grid(X_POINT_COUNT, Y_POINT_COUNT, X_SPACING, Y_SPACING);
    
texturemapping();(在这里glMatrixMode(GL_MODELVIEW);glTranslatef(0, 0, -3);将图像向内移动）
    
renderGrid(X_POINT_COUNT,Y_POINT_COUNT,X_SPACING,Y_SPACING);