//public bool HasAlpha => !(Min.Alpha == 1.0f && Max.Alpha == 1.0f);
internal float GetStats(ITexture texture, int layer, int mipmap, StatisticsShader statShader, ReduceShader redShader, bool normalize)
{
// obtain a buffer that is big enough
int numElements = texture.Size.GetMip(mipmap).Product;
if (layer == -1)
{
numElements *= texture.NumLayers;
}
if (buffer == null || buffer.ElementCount < numElements)
{
buffer?.Dispose();
buffer = new GpuBuffer(4, numElements);
}
// copy all values into buffer
statShader.CopyToBuffer(texture, buffer, layer, mipmap);
// execute reduce
redShader.Run(buffer, numElements);
shared.Download.CopyFrom(buffer);
var res = shared.Download.GetData <float>();
if (normalize)
{
res /= numElements;
}
return(res);
}
/// <summary>
/// allocates a buffer that is big enough to hold numElement floats
/// </summary>
/// <param name="numElements"></param>
/// <returns></returns>
internal GpuBuffer GetBuffer(int numElements)
{
if (buffer == null || buffer.ElementCount < numElements)
{
buffer?.Dispose();
buffer = new GpuBuffer(4, numElements);
}
return(buffer);
}
public override void Dispose()
{
coordDstBuffer.Dispose();
coordShader.Dispose();
base.Dispose();
}
public void Dispose()
{
shader2D?.Dispose();
shader3D?.Dispose();
dstBuffer?.Dispose();
}
protected override void DisposeManaged()
{
vertexBuffer.Dispose();
indexBuffer.Dispose();
vao.Dispose();
}