/// <summary>
/// Rebuild the UI.
/// </summary>
void LateUpdate()
{
if (mWidgets == null)
{
return;
}
// Update all widgets
for (int i = mWidgets.Count; i > 0;)
{
SGWidget w = mWidgets[--i];
if (w == null)
{
mWidgets.RemoveAt(i);
}
else
{
mRebuild |= w.ScreenUpdate();
}
}
// No need to keep this screen if we don't have any widgets left
if (mWidgets.Count == 0)
{
if (Application.isPlaying)
{
Destroy(gameObject);
return;
}
if (mMesh != null)
{
DestroyImmediate(mMesh);
mMesh = null;
}
if (this != null)
{
DestroyImmediate(gameObject);
}
return;
}
// Only continue if we need to rebuild
if (!mRebuild)
{
return;
}
// Sort all widgets back-to-front
mWidgets.Sort(SGWidget.CompareFunc);
// Cache all components
if (mFilter == null)
{
mFilter = gameObject.GetComponent <MeshFilter>();
}
if (mFilter == null)
{
mFilter = gameObject.AddComponent <MeshFilter>();
}
if (mRen == null)
{
mRen = gameObject.GetComponent <MeshRenderer>();
}
if (mRen == null)
{
mRen = gameObject.AddComponent <MeshRenderer>();
mRen.sharedMaterial = mMat;
}
// Fill the vertices and UVs
foreach (SGWidget w in mWidgets)
{
int offset = mVerts.Count;
w.OnFill(mVerts, mUvs, mCols);
// Transform all vertices into world space
Transform t = w.mTrans;
for (int i = offset, imax = mVerts.Count; i < imax; ++i)
{
mVerts[i] = t.TransformPoint(mVerts[i]);
}
}
int count = mVerts.Count;
// Safety check to ensure we get valid values
if (count > 0 && (count == mUvs.Count && count == mCols.Count) && (count % 4) == 0)
{
int index = 0;
// It takes 6 indices to draw a quad of 4 vertices
int[] indices = new int[(count >> 1) * 3];
// Populate the index buffer
for (int i = 0; i < count; i += 4)
{
indices[index++] = i;
indices[index++] = i + 1;
indices[index++] = i + 2;
indices[index++] = i + 2;
indices[index++] = i + 3;
indices[index++] = i;
}
if (mMesh == null)
{
mMesh = new Mesh();
mMesh.name = "UIScreen for " + mMat.name;
}
else
{
mMesh.Clear();
}
// Set the mesh values
mMesh.vertices = mVerts.ToArray();
mMesh.uv = mUvs.ToArray();
mMesh.colors = mCols.ToArray();
mMesh.triangles = indices;
mMesh.RecalculateBounds();
mFilter.mesh = mMesh;
}
else
{
Debug.LogError("UIWidgets must fill the buffer with 4 vertices per quad. Found " + count);
}
// Cleanup
mVerts.Clear();
mUvs.Clear();
mCols.Clear();
// Don't rebuild the screen next frame
mRebuild = false;
}
