fix GL_FALSE/GL_TRUE for glDepthMask

this is largely cosmetic, but better safe than sorry.

Signed-off-by: tgfrerer <tim@poniesandlight.co.uk>
fix sphere primitive winding order consistent

ofPrimitiveSphere can be created using as OF_PRIMITIVE_TRIANGLE_STRIP or OF_PRIMITIVE_TRIANGLES. this fix makes sure that the winding order stays consistent whichever ofPrimitiveMode is requested.

Signed-off-by: tgfrerer <tim@poniesandlight.co.uk>