Get the value of the parameter pname at offset

Property definitions

glesv2 :: glesv2 $ Sys :: glGetBooleanv
# Get the value of the parameter `pname` at `offset`
fun glGetBooleanv(pname: GLGetParameterName, offset: Int): Bool `{
	GLboolean v[4];
	glGetBooleanv(pname, v);
	return v[offset];
`}
lib/glesv2/glesv2.nit:1293,1--1298,2