/**
* parentMat: null -> no change
* same pointer -> parent transform changed
* diff pointer -> parent changed
*/
public static void Draw(Group *self, float *parentMat, bool isParentTransformDirty)
{
var childLst = &self->childLst;
int childCount = childLst->count;
void **childArr = childLst->arr;
// sort by depth if any child depth is changed
for (int i = 0; i < childCount; i += 1)
{
if (Node.IsDepthDirty(childArr[i]))
{
Algo.MergeSort(childArr, childCount, Node.DepthCmp);
break;
}
}
float *mat = self->mat;
float *concatMat = self->concatMat;
bool isTransformDirty = self->isTransformDirty;
if (isTransformDirty)
{
self->isTransformDirty = false;
Mat2D.FromScalingRotationTranslation(mat, self->pos, self->scl, self->rot);
}
if (isParentTransformDirty)
{
self->parentMat = parentMat;
}
if (isTransformDirty || isParentTransformDirty)
{
isParentTransformDirty = true;
if (parentMat == null)
{
Mat2D.Copy(concatMat, mat);
}
else
{
Mat2D.Mul(concatMat, parentMat, mat);
}
}
for (int i = 0; i < childCount; i += 1)
{
Node.Draw(childArr[i], concatMat, isParentTransformDirty);
}
}
