void UpdateMesh()
{
if (Font == null || Size <= 0.0f || Text == null || Text.Length == 0)
{
// only use Text to flag this; we do want to keep the material
// and TextData intact if the Font doesn't change
if (m_PrevText != null)
{
// Text was cleared, nothing to render any more
m_MeshFilter.mesh = null;
m_PrevText = null;
}
return;
}
var rebuildMesh = false;
if ((!m_PrevFont || !m_PrevFont.Equals(Font)) || !m_GeneratedFontData.IsCreated)
{
if (m_GeneratedFontData.IsCreated)
{
m_GeneratedFontData.Dispose();
}
m_GeneratedFontData = FontAssetConversion.ConvertFontData(Font);
m_PrevFont = Font;
m_MeshRenderer.sharedMaterial = Font.material;
rebuildMesh = true;
}
if (m_PrevSize != Size || m_PrevText != Text || m_PrevAlignment != Alignment || m_PrevColor != Color)
{
rebuildMesh = true;
}
if (!rebuildMesh)
{
return;
}
// Lay out the mesh in the same way that the runtime will do it
var vdata = new NativeList <SimpleVertex>(128, Allocator.Temp);
var idata = new NativeList <ushort>(128, Allocator.Temp);
unsafe
{
fixed(char *chars = Text)
TextLayout.LayoutString(chars, Text.Length, Size, Alignment, VerticalAlignment.Baseline, Color.ToTiny().AsFloat4(), ref m_GeneratedFontData.Value,
vdata, idata, out AABB bbox);
// Flip vdata.TexCoord0.y for Unity's UV direction. Do this here to make
// it easier to have two different paths below.
for (int i = 0; i < vdata.Length; ++i)
{
ref var item = ref vdata.ElementAt(i);
item.TexCoord0.y = 1.0f - item.TexCoord0.y;
}
}