gmflib: add wheel constraint (for car steering)

Cargo.lock

@@ -71,7 +71,6 @@ dependencies = [
  "env_logger",
  "gmflib",
  "log",
- "serde_json",
 ]
 
 [[package]]

gmflib/src/types.rs

@@ -762,6 +762,7 @@ pub struct ConstraintList {
 
 #[derive(Debug,Serialize)]
 pub enum Constraint {
+    Wheel(WheelConstraint),
     Hinge(HingeConstraint),
     PointToPoint(PointToPointConstraint),
 }
@@ -770,6 +771,7 @@ impl gmi::Serializable for Constraint {
     fn read<R: io::Read>(r: &mut gmi::ReadStream<R>) -> gmi::ReadResult<Self> {
         let tlv = r.tlv()?;
         let res = match (tlv.tag, tlv.flags) {
+            (46, 2) => Constraint::Wheel(r.read("pivot")?),
             (47, 2) => Constraint::Hinge(r.read("hinge")?),
             (53, 2) => Constraint::PointToPoint(r.read("pointtopoint")?),
             _ => return Err(r.error(format!("unknown constraint type ({}, {})", tlv.tag, tlv.flags))),
@@ -782,12 +784,39 @@ impl gmi::Serializable for Constraint {
 impl gma::Serializable for Constraint {
     fn write<W: io::Write, S: string::ToString>(&self, _name: S, w: &mut gma::WriteStream<W>) -> gma::WriteResult<()> {
         match self {
+            Constraint::Wheel(o) => o.write("", w),
             Constraint::Hinge(o) => o.write("", w),
             Constraint::PointToPoint(o) => o.write("", w),
         }
     }
 }
 
+#[derive(Debug,GMISerializable,GMASerializable,Serialize)]
+#[gma_name("GMID_HAVOK_WHEEL_CONSTRAINT")]
+pub struct WheelConstraint {
+    #[gma_name("NODE_NAME")]
+    pub name: String,
+    pub tm: TransformMatrix,
+    #[gma_name("BODY1")]
+    pub body1: String,
+    #[gma_name("BODY2")]
+    pub body2: String,
+    #[gma_name("POINT")]
+    pub point: [f32; 3],
+    #[gma_name("SPIN_AXIS")]
+    pub spin_axis: [f32; 3],
+    #[gma_name("SUSPENSION_AXIS")]
+    pub suspensions_axis: [f32; 3],
+    #[gma_name("SUSPENSION_LIMITS")]
+    pub suspensions_limits: [f32; 2],
+    #[gma_name("SUSPENSION_FRICTION")]
+    pub suspension_fiction: f32,
+    #[gma_name("ANGULAR_SPEED")]
+    pub angular_speed: f32,
+    #[gma_name("GAIN")]
+    pub gain: f32,
+}
+
 #[derive(Debug,GMISerializable,GMASerializable,Serialize)]
 #[gma_name("GMID_HAVOK_HINGE_CONSTRAINT")]
 pub struct HingeConstraint {