internal void _PreUpdateMask(UpdateContext context, uint maskId)
{
//_maskFlag: 0-new mask, 1-active mask, 2-mask complete
if (_maskFlag == 0)
{
if (_stencilEraser == null)
{
_stencilEraser = new StencilEraser(gameObject.transform);
_stencilEraser.meshFilter.mesh = mesh;
}
else
{
_stencilEraser.enabled = true;
}
}
_maskFlag = 1;
if (_manager != null)
{
//这里使用maskId而不是clipInfo.clipId，是因为遮罩有两个用途，一个是写入遮罩，一个是擦除，两个不能用同一个材质
Material mat = _manager.GetMaterial((int)MaterialFlags.AlphaMask + _materialFlags, BlendMode.Normal, maskId);
if (!Material.ReferenceEquals(mat, _stencilEraser.meshRenderer.sharedMaterial))
{
_stencilEraser.meshRenderer.sharedMaterial = mat;
}
context.ApplyAlphaMaskProperties(mat, true);
}
}
/// <summary>
///
/// </summary>
/// <param name="context"></param>
/// <param name="alpha"></param>
/// <param name="grayed"></param>
public void Update(UpdateContext context, float alpha, bool grayed)
{
Stats.GraphicsCount++;
if (_meshDirty)
{
_alpha = alpha;
UpdateMeshNow();
}
else if (_alpha != alpha)
{
ChangeAlpha(alpha);
}
if (_propertyBlock != null && _blockUpdated)
{
meshRenderer.SetPropertyBlock(_propertyBlock);
_blockUpdated = false;
}
if (_customMatarial != 0)
{
if ((_customMatarial & 2) != 0 && _material != null)
{
context.ApplyClippingProperties(_material, false);
}
}
else
{
if (_manager != null)
{
if (_maskFlag == 1)
{
_material = _manager.GetMaterial((int)MaterialFlags.AlphaMask + _materialFlags, BlendMode.Normal, context.clipInfo.clipId);
context.ApplyAlphaMaskProperties(_material, false);
}
else
{
int matFlags = _materialFlags;
if (grayed)
{
matFlags |= (int)MaterialFlags.Grayed;
}
if (context.clipped)
{
if (context.stencilReferenceValue > 0)
{
matFlags |= (int)MaterialFlags.StencilTest;
}
if (context.rectMaskDepth > 0)
{
if (context.clipInfo.soft)
{
matFlags |= (int)MaterialFlags.SoftClipped;
}
else
{
matFlags |= (int)MaterialFlags.Clipped;
}
}
_material = _manager.GetMaterial(matFlags, blendMode, context.clipInfo.clipId);
if (_manager.firstMaterialInFrame)
{
context.ApplyClippingProperties(_material, true);
}
}
else
{
_material = _manager.GetMaterial(matFlags, blendMode, 0);
}
}
}
else
{
_material = null;
}
if (!Material.ReferenceEquals(_material, meshRenderer.sharedMaterial))
{
meshRenderer.sharedMaterial = _material;
}
}
if (_maskFlag != 0)
{
if (_maskFlag == 1)
{
_maskFlag = 2;
}
else
{
if (_stencilEraser != null)
{
_stencilEraser.enabled = false;
}
_maskFlag = 0;
}
}
}