public static DescriptorHandle operator +(DescriptorHandle handle, int offsetScaledByDescriptorSize)
{
DescriptorHandle ret = new DescriptorHandle(handle._CPUHandle, handle._GPUHandle);
if (handle._CPUHandle.Ptr != -1)
{
handle._CPUHandle.Ptr += offsetScaledByDescriptorSize;
}
if (handle._GPUHandle.Ptr != -1)
{
handle._GPUHandle.Ptr += offsetScaledByDescriptorSize;
}
return(handle);
}
/// <summary>
/// The CopyAndBindStaleTables
/// </summary>
/// <param name="type">The <see cref="DescriptorHeapType"/></param>
/// <param name="descriptorSize">The <see cref="uint"/></param>
/// <param name="destHandleStart">The <see cref="DescriptorHandle"/></param>
/// <param name="setFunction">The <see cref="CommandListSetFunc"/></param>
public void CopyAndBindStaleTables(DescriptorHeapType type, uint descriptorSize, DescriptorHandle destHandleStart, CommandListSetFunc setFunction)
{
uint staleParamCount = 0;
var tableSize = new int[MaxNumDescriptorTables];
var rootIndices = new int[MaxNumDescriptorTables];
var needSpace = 0;
int rootIndex;
var staleParams = StaleRootParamsBitMap;
while (BitScanner.BitScanForward(staleParams, out rootIndex))
{
rootIndices[staleParamCount] = rootIndex;
staleParams ^= (uint)(1 << (int)rootIndex);
Debug.Assert(BitScanner.BitScanReverse(RootDescriptorTable[rootIndex].AssignedHandleBitMap, out var maxSetHandle), "Root entry marked as stale but has no stale descriptors");
needSpace += maxSetHandle + 1;
tableSize[staleParamCount] = maxSetHandle + 1;
staleParamCount++;
}
Debug.Assert(staleParamCount <= MaxNumDescriptorTables, "We're only equipped to handle so many descriptor tables");
StaleRootParamsBitMap = 0;
const uint maxdescriptorPerCopy = 16;
var numDestDescriptorRanges = 0;
var destDescriptorRangeStarts = new CpuDescriptorHandle[maxdescriptorPerCopy];
var destDescriptorRangeSizes = new int[maxdescriptorPerCopy];
var numSrcDescriptorRanges = 0;
var srcDescriptorRangeStarts = new CpuDescriptorHandle[maxdescriptorPerCopy];
var srcDescriptorRangeSizes = new int[maxdescriptorPerCopy];
for (uint idx = 0; idx < staleParamCount; idx++)
{
rootIndex = rootIndices[idx];
setFunction?.Invoke((int)rootIndex, destHandleStart.GPUHandle);
var rootDescTable = RootDescriptorTable[rootIndex];
var srcHandles = rootDescTable.TableStart;
UInt64 setHandles = rootDescTable.AssignedHandleBitMap;
var curDest = destHandleStart.CPUHandle;
destHandleStart += (int)(tableSize[idx] * descriptorSize);
while (BitScanner.BitScanForward64(setHandles, out var skipCount))
{
setHandles >>= skipCount;
srcHandles += skipCount;
curDest.Ptr += skipCount * descriptorSize;
BitScanner.BitScanForward64(~setHandles, out var descriptorCount);
setHandles >>= descriptorCount;
if (numSrcDescriptorRanges + descriptorCount > maxdescriptorPerCopy)
{
Globals.Device.CopyDescriptors(numDestDescriptorRanges, destDescriptorRangeStarts, destDescriptorRangeSizes, numSrcDescriptorRanges, srcDescriptorRangeStarts, srcDescriptorRangeSizes, type);
numSrcDescriptorRanges = 0;
numDestDescriptorRanges = 0;
}
destDescriptorRangeStarts[numDestDescriptorRanges] = curDest;
destDescriptorRangeSizes[numDestDescriptorRanges] = descriptorCount;
numDestDescriptorRanges++;
for (int jdx = 0; jdx < descriptorCount; jdx++)
{
srcDescriptorRangeStarts[numSrcDescriptorRanges] = Marshal.PtrToStructure <CpuDescriptorHandle>(rootDescTable.TableStart + jdx * Marshal.SizeOf <CpuDescriptorHandle>());
srcDescriptorRangeSizes[numSrcDescriptorRanges] = 1;
numSrcDescriptorRanges++;
}
srcHandles += descriptorCount;
curDest.Ptr += descriptorCount;
}
}
Globals.Device.CopyDescriptors(numDestDescriptorRanges, destDescriptorRangeStarts, destDescriptorRangeSizes, numSrcDescriptorRanges, srcDescriptorRangeStarts, srcDescriptorRangeSizes, type);
}