android - OpenGL 中的 2D 游戏 - 坐标

Question

我怎样才能像在 2D 游戏中那样做坐标（所以 X = 0 Y = 0 在右上角）？左边是这样的：

Answer 1

You simply have to use some formulas to convert between the two coordinate systems.

openGL_x = (screen_x - width/2)/(width/2)   == a*x + b;
openGL_y = (height/2 - screenY)/(height/2)  == c*y + d;

With openGL you can embed these two linear equations into the ViewMatrix and work with pixel coordinates.