Winding order

[evilduck41]

BGFX apparently uses CW winding order with glFrontFace. There is a flag BGFX_STATE_FRONT_CCW that appears to do CCW.

My issue is I am running an opengl app that calls bgfx to do some post picture work after a render. Upon exiting bgfx the winding order of our model in our simulation is apparently reversed and so the model appears inside out. It tried issuing a setState with BGFX_STATE_FRONT_CCW then a frame() but no luck. How can I get bgfx to restore winding order?

[bkaradzic]

Upon exiting bgfx the winding order of our model in our simulation is apparently reversed and so the model appears inside out.

Once you're out of bgfx rendering part, the best way is to just call open GL call to set winding order you desire...

bgfx doesn't store/restore state. bgfx assumes that all state needs to be set when inside bgfx renderer, and your code should assume all state needs to be set after you exit bgfx.

[evilduck41]

But what happens if I feed BGFX meshes from our app that are in CCW order to opengl. Are we going to have to massage the index buffers and then not do that on directx since directx appears to default to CCW. I fixed the one issue but as we replace our renderer with bgfx this could be an issue for CCW?

Thanks for the help

[bkaradzic]

Not sure if I understand what you're saying?!

If your mesh appears correct in bgfx/D3D, it will appear correct in bgfx/GL too. If there is mismatch with your GL application and bgfx it doesn't really matter, once you make it appear correctly in bgfx, it should be consistent between all bgfx rendering backends (regardless which one is selected).