/// <summary>
/// Updates the fog chunk states. The chunk will update its buffer and texture once at the start.
/// It will then be in the idle state and check for revealers within its bounds moving.
/// If a revealer within its bounds changes position, it will then update the buffer and texture.
/// This avoids needless buffer and texture updating when nothing in the fog of war chunk has changed.
/// </summary>
protected void Update()
{
if (!chunkActive)
{
return;
}
if (clampBlendFactor)
{
if (textureBlendTime > 0f)
{
blendFactor = Mathf.Clamp01(blendFactor + Time.deltaTime / textureBlendTime);
}
else
{
blendFactor = 1f;
}
}
//will it blend?
if (fogState == MangoFogState.Blending)
{
float time = Time.time;
if (nextUpdate < time)
{
nextUpdate = time + updateFrequency;
fogState = MangoFogState.NeedUpdate;
}
}
//the buffer was updated, update the texture
else if (fogState != MangoFogState.NeedUpdate)
{
UpdateTexture();
}
}
/// <summary>
/// Update the specified texture with the new color buffer.
/// </summary>
protected void UpdateTexture()
{
if (!chunkActive)
{
return;
}
if (fogTexture == null)
{
// Native ARGB format is the fastest as it involves no data conversion
fogTexture = new Texture2D(textureSize, textureSize, TextureFormat.ARGB32, false);
fogTexture.wrapMode = TextureWrapMode.Clamp;
fogTexture.SetPixels32(buffer0);
fogTexture.filterMode = MangoFogInstance.Instance.fogFilterMode;
fogTexture.Apply();
fogState = MangoFogState.Blending;
}
else if (fogState == MangoFogState.UpdateTexture)
{
fogTexture.SetPixels32(buffer0);
fogTexture.Apply();
blendFactor = 0f;
fogState = MangoFogState.Blending;
}
//let it blend until the chunk needs to be updated again
//changeStates[chunkID] = 0;
}
public void StartChunk()
{
//buffer update at the start
changeStates[chunkID] = 1;
fogState = MangoFogState.Blending;
//enables the system to start updating
chunkActive = true;
// creates a new thread for this chunk
fogThread = new Thread(() => UpdateThread(chunkID));
doThread = true;
fogThread.Start();
}
/// <summary>
/// If it's time to update, do so now.
/// </summary>
protected void UpdateThread(int chunkID)
{
System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();
int cid = chunkID;
while (doThread)
{
//make sure the buffer needs updating and revealer changes were made
if (fogState == MangoFogState.NeedUpdate)
{
sw.Reset();
sw.Start();
UpdateBuffer();
sw.Stop();
elapsed = 0.001f * (float)sw.ElapsedMilliseconds;
//buffer was updated, update the texture
fogState = MangoFogState.UpdateTexture;
}
Thread.Sleep(1);
}
#if UNITY_EDITOR
Debug.Log("The thread has exited.");
#endif
}