I programed a small game. On the most systems it works correctly.
But on some systems every OpenGL project I tested is veeeeeery slow. But Direct3D works on this systems.
Is there a way to correct this or will I have to code a second version in Direct3D ?
Things can run really really slowww when it runs of video memory.
Its more likly that you only get software rendering on certain machines.
That could be, because:
-Those machines dont have a driver that supports OpenGL (the ones that ship with windows for example)
-You are requesting a pixelformat that is not accelerated on those machines.
Without more details its really hard to tell.