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HnRenderPass: correctly compute joints data range in structured mode
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@TheMostDiligent
TheMostDiligent committed Nov 26, 2024
1 parent e9753f7 commit 5e4bc0b
Showing 1 changed file with 56 additions and 21 deletions.
77 changes: 56 additions & 21 deletions Hydrogent/src/HnRenderPass.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -407,9 +407,8 @@ HnRenderPass::EXECUTE_RESULT HnRenderPass::Execute(HnRenderPassState& RPState, c
VERIFY_EXPR(pPrimitiveAttribsCB != nullptr);
IBuffer* const pJointsCB = State.USDRenderer.GetJointsBuffer();
const Uint32 MaxJointCount = State.RendererSettings.MaxJointCount;
const Uint32 JointsDataRange = State.USDRenderer.GetJointsBufferSize();
const bool PackMatrixRowMajor = State.RendererSettings.PackMatrixRowMajor;
VERIFY_EXPR(pJointsCB != nullptr || JointsDataRange == 0);

const Uint32 JointsBufferOffsetAlignment = (State.RendererSettings.JointsBufferMode == USD_Renderer::JOINTS_BUFFER_MODE_UNIFORM) ?
State.ConstantBufferOffsetAlignment :
sizeof(float4x4);
Expand All @@ -422,11 +421,13 @@ HnRenderPass::EXECUTE_RESULT HnRenderPass::Execute(HnRenderPassState& RPState, c
void* pMappedPrimitiveData = nullptr;
Uint32 AttribsBufferOffset = 0;

void* pMappedJointsData = nullptr;
Uint32 JointsBufferOffset = 0;
Uint32 CurrJointsDataSize = 0;
size_t XformsHash = 0;
Uint32 JointCount = 0;
void* pMappedJointsData = nullptr;
Uint32 JointsBufferOffset = 0;
Uint32 TotalJointsDataSize = 0;
size_t XformsHash = 0;
Uint32 JointCount = 0;
Uint32 JointsDataRange = 0;
Uint32 JointsDataSize = 0;

if (AttribsBuffDesc.Usage != USAGE_DYNAMIC)
{
Expand Down Expand Up @@ -465,18 +466,21 @@ HnRenderPass::EXECUTE_RESULT HnRenderPass::Execute(HnRenderPassState& RPState, c
m_PrimitiveAttribsData.data(), AttribsBufferOffset);
AttribsBufferOffset = 0;

if (CurrJointsDataSize > 0)
if (TotalJointsDataSize > 0)
{
VERIFY_EXPR(JointsBuffDesc.Usage == USAGE_DYNAMIC || CurrJointsDataSize <= m_JointsData.size());
VERIFY_EXPR(JointsBuffDesc.Usage == USAGE_DYNAMIC || TotalJointsDataSize <= m_JointsData.size());
UnmapOrUpdateBuffer(pJointsCB, JointsBuffDesc, pMappedJointsData,
m_JointsData.data(), CurrJointsDataSize);
m_JointsData.data(), TotalJointsDataSize);
}
JointsBufferOffset = 0;
CurrJointsDataSize = 0;
JointsBufferOffset = 0;
TotalJointsDataSize = 0;
// Reset the hash to force updating the joint transforms for the next draw item.
// NB: we can't reuse the transforms at the existing offset because they may be
// overwritten by the next draw item.
XformsHash = 0;
XformsHash = 0;
JointCount = 0;
JointsDataRange = 0;
JointsDataSize = 0;

RenderPendingDrawItems(State);
VERIFY_EXPR(m_PendingDrawItems.empty());
Expand Down Expand Up @@ -540,7 +544,39 @@ HnRenderPass::EXECUTE_RESULT HnRenderPass::Execute(HnRenderPassState& RPState, c
// Restart batch when the joint transforms change
MultiDrawCount = 0;

if (CurrJointsDataSize + JointsDataRange > JointsBuffDesc.Size)
JointCount = std::min(static_cast<Uint32>(pSkinningData->Xforms->size()), MaxJointCount);
JointsDataSize = State.USDRenderer.GetJointsDataSize(JointCount, PSOFlags);
if (State.RendererSettings.JointsBufferMode == USD_Renderer::JOINTS_BUFFER_MODE_UNIFORM)
{
// RenderPBR.vsh
//
// struct SkinnigData
// {
// # if COMPUTE_MOTION_VECTORS
// float4x4 Joints[MAX_JOINT_COUNT * 2];
// # else
// float4x4 Joints[MAX_JOINT_COUNT];
// # endif
// };
//
// Joints data range is the size of the entire structure with the maximum number of joints.
JointsDataRange = State.USDRenderer.GetJointsDataSize(MaxJointCount, PSOFlags);
}
else if (State.RendererSettings.JointsBufferMode == USD_Renderer::JOINTS_BUFFER_MODE_STRUCTURED)
{
// RenderPBR.vsh
//
// StructuredBuffer<float4x4> g_JointTransforms;
//
// Joints data range is the size of the actual data.
JointsDataRange = JointsDataSize;
}
else
{
UNEXPECTED("Unexpected joints buffer mode");
}

if (TotalJointsDataSize + JointsDataRange > JointsBuffDesc.Size)
{
// There is not enough space for the new joint transforms.
// Flush pending draws to start filling the joints buffer from the beginning.
Expand Down Expand Up @@ -617,11 +653,10 @@ HnRenderPass::EXECUTE_RESULT HnRenderPass::Execute(HnRenderPassState& RPState, c
{
if (pSkinningData->XformsHash != XformsHash)
{
VERIFY(CurrJointsDataSize + JointsDataRange <= JointsBuffDesc.Size,
VERIFY(TotalJointsDataSize + JointsDataRange <= JointsBuffDesc.Size,
"There must be enough space for the new joint transforms as we flush the pending draw if there is not enough space.");

JointsBufferOffset = CurrJointsDataSize;
JointCount = std::min(static_cast<Uint32>(pSkinningData->Xforms->size()), MaxJointCount);
JointsBufferOffset = TotalJointsDataSize;

void* pJointsData = GetBufferDataPtr(pJointsCB, JointsBuffDesc, pMappedJointsData, JointsBufferOffset, m_JointsData, JointsDataRange);
if (pJointsData == nullptr)
Expand All @@ -633,10 +668,10 @@ HnRenderPass::EXECUTE_RESULT HnRenderPass::Execute(HnRenderPassState& RPState, c
WriteSkinningAttribs.JointMatrices = reinterpret_cast<const float4x4*>(pSkinningData->Xforms->data());
WriteSkinningAttribs.PrevJointMatrices = reinterpret_cast<const float4x4*>(PrevXforms->data());

void* pDataEnd = State.USDRenderer.WriteSkinningData(pJointsData, WriteSkinningAttribs);
const Uint32 JointsDataSize = static_cast<Uint32>(reinterpret_cast<Uint8*>(pDataEnd) - reinterpret_cast<Uint8*>(pJointsData));
VERIFY_EXPR(JointsDataSize == State.USDRenderer.GetJointsDataSize(JointCount, PSOFlags));
CurrJointsDataSize = AlignUp(JointsBufferOffset + JointsDataSize, JointsBufferOffsetAlignment);
void* pDataEnd = State.USDRenderer.WriteSkinningData(pJointsData, WriteSkinningAttribs);
VERIFY_EXPR(JointsDataSize == static_cast<Uint32>(reinterpret_cast<Uint8*>(pDataEnd) - reinterpret_cast<Uint8*>(pJointsData)));
(void)pDataEnd;
TotalJointsDataSize = AlignUp(JointsBufferOffset + JointsDataSize, JointsBufferOffsetAlignment);

XformsHash = pSkinningData->XformsHash;

Expand Down

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