private static bool IsAxis(SDLFeatureDescriptor feature, SDLAxisUsage axis)
{
return(feature.featureType == JoystickFeatureType.Axis &&
feature.usageHint == (int)axis);
}
internal InputControlLayout Build()
{
var builder = new InputControlLayout.Builder
{
stateFormat = new FourCC('L', 'J', 'O', 'Y'),
extendsLayout = parentLayout
};
for (var i = 0; i < descriptor.controls.Count; i++)
{
SDLFeatureDescriptor feature = descriptor.controls[i];
switch (feature.featureType)
{
case JoystickFeatureType.Axis:
{
SDLAxisUsage usage = (SDLAxisUsage)feature.usageHint;
string featureName = SDLSupport.GetAxisNameFromUsage(usage);
string parameters = "scale,scaleFactor=65538,clamp,clampMin=-1,clampMax=1";
if (IsAxisX(feature) && i + 1 < descriptor.controls.Count)
{
SDLFeatureDescriptor nextFeature = descriptor.controls[i + 1];
if (IsAxisY(nextFeature))
{
BuildStickFeature(ref builder, feature, nextFeature);
}
}
if (IsAxisY(feature))
{
parameters += ",invert";
}
builder.AddControl(featureName)
.WithLayout("Analog")
.WithByteOffset((uint)feature.offset)
.WithFormat(InputStateBlock.kTypeInt)
.WithParameters(parameters);
}
break;
case JoystickFeatureType.Ball:
{
//TODO
}
break;
case JoystickFeatureType.Button:
{
SDLButtonUsage usage = (SDLButtonUsage)feature.usageHint;
string featureName = SDLSupport.GetButtonNameFromUsage(usage);
if (featureName != null)
{
builder.AddControl(featureName)
.WithLayout("Button")
.WithByteOffset((uint)feature.offset)
.WithBitOffset((uint)feature.bit)
.WithFormat(InputStateBlock.kTypeBit);
}
}
break;
case JoystickFeatureType.Hat:
{
SDLAxisUsage usage = (SDLAxisUsage)feature.usageHint;
string featureName = SDLSupport.GetAxisNameFromUsage(usage);
string parameters = "scale,scaleFactor=2147483647,clamp,clampMin=-1,clampMax=1";
if (i + 1 < descriptor.controls.Count)
{
SDLFeatureDescriptor nextFeature = descriptor.controls[i + 1];
if (IsHatY(nextFeature) && HatNumber(feature) == HatNumber(nextFeature))
{
BuildHatFeature(ref builder, feature, nextFeature);
}
}
if (IsHatY(feature))
{
parameters += ",invert";
}
builder.AddControl(featureName)
.WithLayout("Analog")
.WithByteOffset((uint)feature.offset)
.WithFormat(InputStateBlock.kTypeInt)
.WithParameters(parameters);
}
break;
default:
{
throw new NotImplementedException(String.Format("SDLLayoutBuilder.Build: Trying to build an SDL device with an unknown feature of type {0}.", feature.featureType));
}
}
}
return(builder.Build());
}
public static string GetAxisNameFromUsage(SDLAxisUsage usage)
{
return(Enum.GetName(typeof(SDLAxisUsage), usage));
}
