static void FillInitData(Resource texture, int width, int height, int depth, int mipCount, int arraySize, Format format, int maxsize, int bitSize, byte[] bitData, int offset)
{
int NumBytes = 0;
int RowBytes = 0;
int NumRows = 0;
byte[] pSrcBits = bitData;
byte[] pEndBits = bitData;// + bitSize;
int index = 0;
int k = offset;
for (int j = 0; j < arraySize; j++)
{
int w = width;
int h = height;
int d = depth;
for (int i = 0; i < mipCount; i++)
{
GetSurfaceInfo(w, h, format, out NumBytes, out RowBytes, out NumRows);
GCHandle handle = GCHandle.Alloc(bitData, GCHandleType.Pinned);
IntPtr ptr = Marshal.UnsafeAddrOfPinnedArrayElement(bitData, k);
texture.WriteToSubresource(index, null, ptr, RowBytes, NumBytes);
handle.Free();
index++;
k += NumBytes * d;
w = w >> 1;
h = h >> 1;
d = d >> 1;
if (w == 0)
{
w = 1;
}
if (h == 0)
{
h = 1;
}
if (d == 0)
{
d = 1;
}
}
}
}
private void BuildRandomVectorTexture(GraphicsCommandList cmdList)
{
var texDesc = new ResourceDescription
{
Dimension = ResourceDimension.Texture2D,
Width = 256,
Height = 256,
DepthOrArraySize = 1,
MipLevels = 1,
Format = Format.R8G8B8A8_UNorm,
SampleDescription = new SampleDescription(1, 0),
Layout = TextureLayout.Unknown,
Flags = ResourceFlags.None
};
_randomVectorMap = _device.CreateCommittedResource(
new HeapProperties(CpuPageProperty.WriteBack, MemoryPool.L0),
HeapFlags.None,
texDesc,
ResourceStates.GenericRead);
//
// In order to copy CPU memory data into our default buffer, we need to create
// an intermediate upload heap.
//
var initData = new Color[256 * 256];
for (int i = 0; i < 256; i++)
{
for (int j = 0; j < 256; j++)
{
// Random vector in [0,1]. We will decompress in shader to [-1,1].
initData[i * 256 + j] = new Color(
MathHelper.Randf(),
MathHelper.Randf(),
MathHelper.Randf(),
0.0f);
}
}
int rowPitch = Utilities.SizeOf <Color>() * 256;
int slicePitch = rowPitch * 256;
Utilities.Pin(initData, ptr => _randomVectorMap.WriteToSubresource(0, null, ptr, rowPitch, slicePitch));
}