Best practice settings Effect parameters in XNA
- by hichaeretaqua
I want to ask if there is a best practice settings effect parameters in XNA. Or in other words, what exactly happens when I call pass.Apply(). I can imagine multiple scenarios:
Each time Apply() is called, all effect parameters are transferred to the GPU and therefor it has no real influence how often I set a parameter.
Each time Apply() is called, only the parameters that got reset are transferred. So caching Set-operations that don't actually set a new value should be avoided.
Each time Apply() is called, only the parameters that got changed are transferred. So caching Set-operations is useless.
This whole questions is bootless because no one of the mentions ways has any noteworthy impact on game performance.
So the final question: Is it useful to implement some caching of Set-operation like:
private Matrix _world;
public Matrix World
{
get{ return _world;}
set
{
if(value == world)return;
_effect.Parameters["xWorld"].SetValue(value);
_world = value;
}
Thanking you in anticipation
