void Update()
{
// Release the plugin instance when the previously established
// connection is now invalid.
if (_plugin != System.IntPtr.Zero && !PluginEntry.CheckValid(_plugin))
{
Util.IssuePluginEvent(PluginEntry.Event.Dispose, _plugin);
_plugin = System.IntPtr.Zero;
}
// Plugin lazy initialization
if (_plugin == System.IntPtr.Zero)
{
_plugin = PluginEntry.CreateReceiver(_sourceName);
if (_plugin == System.IntPtr.Zero)
{
return; // Spout may not be ready.
}
}
Util.IssuePluginEvent(PluginEntry.Event.Update, _plugin);
// Texture information retrieval
var ptr = PluginEntry.GetTexturePointer(_plugin);
var width = PluginEntry.GetTextureWidth(_plugin);
var height = PluginEntry.GetTextureHeight(_plugin);
// Resource validity check
if (_sharedTexture != null)
{
if (ptr != _sharedTexture.GetNativeTexturePtr() ||
width != _sharedTexture.width ||
height != _sharedTexture.height)
{
// Not match: Destroy to get refreshed.
Util.Destroy(_sharedTexture);
}
}
// Shared texture lazy (re)initialization
if (_sharedTexture == null && ptr != System.IntPtr.Zero)
{
_sharedTexture = Texture2D.CreateExternalTexture(
width, height, TextureFormat.ARGB32, false, false, ptr
);
_sharedTexture.hideFlags = HideFlags.DontSave;
// Destroy the previously allocated receiver texture to
// refresh specifications.
if (_receivedTexture == null)
{
Util.Destroy(_receivedTexture);
}
}
// Texture format conversion with the blit shader
if (_sharedTexture != null)
{
// Blit shader lazy initialization
if (_blitMaterial == null)
{
_blitMaterial = new Material(Shader.Find("Hidden/Spout/Blit"));
_blitMaterial.hideFlags = HideFlags.DontSave;
}
if (_targetTexture != null)
{
// Blit the shared texture to the target texture.
Graphics.Blit(_sharedTexture, _targetTexture, _blitMaterial, 1);
}
else
{
// Receiver texture lazy initialization
if (_receivedTexture == null)
{
_receivedTexture = new RenderTexture
(_sharedTexture.width, _sharedTexture.height, 0);
_receivedTexture.hideFlags = HideFlags.DontSave;
}
// Blit the shared texture to the receiver texture.
Graphics.Blit(_sharedTexture, _receivedTexture, _blitMaterial, 1);
}
}
// Renderer override
if (_targetRenderer != null && receivedTexture != null)
{
// Material property block lazy initialization
if (_propertyBlock == null)
{
_propertyBlock = new MaterialPropertyBlock();
}
// Read-modify-write
_targetRenderer.GetPropertyBlock(_propertyBlock);
_propertyBlock.SetTexture(_targetMaterialProperty, receivedTexture);
_targetRenderer.SetPropertyBlock(_propertyBlock);
}
}