void AddFowOfWarTransitionSlot(int x, int y, byte initialAlpha, byte targetAlpha, float delay, float duration)
{
int fc = fowTransitionList.Count;
FogOfWarTransition fw = null;
for (int k = 0; k < fc; k++)
{
FogOfWarTransition fi = fowTransitionList [k];
if (fi.x == x && fi.y == y)
{
fw = fi;
break;
}
else if (!fi.enabled)
{
fw = fi;
}
}
if (fw == null)
{
fw = new FogOfWarTransition();
fowTransitionList.Add(fw);
}
fw.x = x;
fw.y = y;
fw.duration = duration;
fw.startTime = Time.time;
fw.startDelay = delay;
fw.initialAlpha = initialAlpha;
fw.targetAlpha = targetAlpha;
fw.enabled = true;
}
void FogOfWarUpdate()
{
if (!_fogOfWarEnabled)
{
return;
}
int fc = fowTransitionList.Count;
int tw = fogOfWarTexture.width;
bool hasChanged = false;
for (int k = 0; k < fc; k++)
{
FogOfWarTransition fw = fowTransitionList [k];
if (!fw.enabled)
{
continue;
}
float elapsed = Time.time - fw.startTime - fw.startDelay;
if (elapsed > 0)
{
float t = fw.duration <= 0 ? 1 : elapsed / fw.duration;
t = Mathf.Clamp01(t);
byte alpha = (byte)Mathf.Lerp(fw.initialAlpha, fw.targetAlpha, t);
int colorPos = fw.y * tw + fw.x;
fogOfWarColorBuffer [colorPos].a = alpha;
fogOfWarTexture.SetPixel(fw.x, fw.y, fogOfWarColorBuffer [colorPos]);
hasChanged = true;
if (t >= 1f)
{
fw.enabled = false;
// Add clearance slot if needed
if (fw.targetAlpha < 255 && _fogOfWarRestoreDelay > 0)
{
AddFowOfWarTransitionSlot(fw.x, fw.y, fw.targetAlpha, 255, _fogOfWarRestoreDelay, _fogOfWarRestoreDuration);
}
}
}
}
if (hasChanged)
{
fogOfWarTexture.Apply();
}
}
/// <summary>
/// Updates fog of war transitions and uploads texture changes to GPU if required
/// </summary>
public void UpdateFogOfWar(bool forceUpload = false)
{
if (!enableFogOfWar || _fogOfWarTexture == null)
{
return;
}
if (forceUpload)
{
requiresTextureUpload = true;
}
int tw = _fogOfWarTexture.width;
for (int k = 0; k <= lastTransitionPos; k++)
{
FogOfWarTransition fw = fowTransitionList[k];
if (!fw.enabled)
{
continue;
}
float elapsed = Time.time - fw.startTime - fw.startDelay;
if (elapsed > 0)
{
float t = fw.duration <= 0 ? 1 : elapsed / fw.duration;
if (t < 0)
{
t = 0;
}
else if (t > 1f)
{
t = 1f;
}
int alpha = (int)(fw.initialAlpha + (fw.targetAlpha - fw.initialAlpha) * t);
int colorPos = fw.y * tw + fw.x;
fogOfWarColorBuffer[colorPos].a = (byte)alpha;
requiresTextureUpload = true;
if (t >= 1f)
{
fowTransitionList[k].enabled = false;
// Add refill slot if needed
if (fw.targetAlpha < 255 && fogOfWarRestoreDelay > 0)
{
AddFogOfWarTransitionSlot(fw.x, fw.y, (byte)fw.targetAlpha, 255, fogOfWarRestoreDelay, fogOfWarRestoreDuration);
}
}
}
}
if (requiresTextureUpload)
{
requiresTextureUpload = false;
_fogOfWarTexture.SetPixels32(fogOfWarColorBuffer);
_fogOfWarTexture.Apply();
// Smooth texture
if (fogOfWarBlur)
{
SetFowBlurTexture();
}
#if UNITY_EDITOR
if (!Application.isPlaying)
{
UnityEditor.EditorUtility.SetDirty(_fogOfWarTexture);
}
#endif
}
}
