private T Reduce <T>(UploadBuffer data, ReduceShader shader) where T : struct
{
Console.WriteLine("num groups: " + Utility.DivideRoundUp(data.ByteSize / 4, ReduceShader.ElementsPerGroup));
using (var buf = new GpuBuffer(4, data.ByteSize / 4))
{
buf.CopyFrom(data);
using (var timer = new GpuTimer())
{
timer.Start();
//for(int i = 0; i < 100; ++i)
shader.Run(buf, data.ByteSize / 4);
timer.Stop();
Console.WriteLine(timer.GetDelta());
}
using (var res = new DownloadBuffer(4))
{
res.CopyFrom(buf, Marshal.SizeOf <T>());
var resData = res.GetData <T>();
return(resData);
}
}
}
//public bool HasAlpha => !(Min.Alpha == 1.0f && Max.Alpha == 1.0f);
internal float GetStats(ITexture texture, LayerMipmapRange lm, StatisticsShader statShader, ReduceShader redShader, bool normalize)
{
Debug.Assert(lm.IsSingleMipmap);
// obtain a buffer that is big enough
int numElements = texture.Size.GetMip(lm.FirstMipmap).Product;
if (lm.AllLayer)
{
numElements *= texture.LayerMipmap.Layers;
}
// allocate buffer that is big enough
GetBuffer(numElements);
// copy all values into buffer
statShader.CopyToBuffer(texture, buffer, lm);
// execute reduce
redShader.Run(buffer, numElements);
shared.Download.CopyFrom(buffer, sizeof(float));
var res = shared.Download.GetData <float>();
if (normalize)
{
res /= numElements;
}
return(res);
}
//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);
}
