Update gpurt from commit b0e4674a

Support cpsGlobal in DispatchRaysIndirect
First attempt at shared file validation
Move CopyAS to shadersClean
Use global atomic to get dispatch id
Fix line length limits for GPURT_ENABLE_GPU_DEBUG=ON
Updated stages for CmdWriteImmediate
gpurtDevice: Add public numprims calc function
[Continuations] Introduce helper structs for packed and unpacked Vpc values
Defines an RT IP enumeration inside GpuRT that is more stable (across driver versions) than the PAL equivalent
[Continuations] Remove SuspendWave mode
[Continuations] Revamp scheduling to not use wait masks
Add float3 versions of AmdExtD3DShaderIntrinsics_WaveClusterMax / AmdExtD3DShaderIntrinsics_WaveClusterMin

backends/pal/gpurtPalBackend.cpp

@@ -152,11 +152,11 @@ void PalBackend::WriteImmediateSingle(
     ImmediateDataWidth    width
     ) const
 {
-    // We want to use HwPipePreCs (ME) so that the writes do not occur before UAV barriers are done waiting.
+    // We want to use StagePostPrefetch (ME) so that the writes do not occur before UAV barriers are done waiting.
     // Both internal barriers during the build and application barriers synchronizing access to acceleration
-    // structure memory wait at HwPipePreCs.
+    // structure memory wait at StagePostPrefetch.
     GetCmdBuffer(cmdBuffer)->CmdWriteImmediate(
-        Pal::HwPipePoint::HwPipePreCs,
+        Pal::PipelineStageFlag::PipelineStagePostPrefetch,
         value,
         GpuRtToPalImmediateDataWidth(width),
         destVa);

cmake/GpuRtGenerateShaders.cmake

@@ -76,6 +76,7 @@ if (GPURT_ENABLE_GPU_DEBUG)
     set(debugShaderDirectory "${CMAKE_CURRENT_BINARY_DIR}/debugShaders/src/shaders/")
     set(gpurtShaderSource ${GPURT_SHADER_SOURCE_FILES})
     set(gpurtShadersSourceDir ${debugShaderDirectory})
+    set(gpurtShadersPreprocessInputFile "${CMAKE_CURRENT_BINARY_DIR}/debugShaders/DebugPreprocessShadersInput.txt")
     list(TRANSFORM gpurtShaderSource PREPEND "${debugShaderDirectory}")
     set(preprocessArgs "")
     foreach(originalSourceFile ${GPURT_SHADER_SOURCE_FILES})
@@ -84,10 +85,13 @@ if (GPURT_ENABLE_GPU_DEBUG)
         list(APPEND preprocessArgs "${originalSourcePath}" "${newSourceFilePath}")
     endforeach()
     set(gpurtDebugPreprocessorScript "${gpurtToolsDir}/DebugPreprocessShaders.py")
+    configure_file("${gpurtToolsDir}/DebugPreprocessShadersInput.txt.in"
+    ${gpurtShadersPreprocessInputFile}
+    )
     add_custom_command(
         OUTPUT  ${gpurtShaderSource} ${gpurtDebugInfoFile}
-        DEPENDS ${originalShaderSource} ${gpurtDebugPreprocessorScript}
-        COMMAND Python3::Interpreter ${gpurtDebugPreprocessorScript} ${preprocessArgs} ${gpurtDebugInfoFile}
+        DEPENDS ${originalShaderSource} ${gpurtDebugPreprocessorScript} ${gpurtShadersPreprocessInputFile}
+        COMMAND Python3::Interpreter ${gpurtDebugPreprocessorScript} -i ${gpurtShadersPreprocessInputFile} -o ${gpurtDebugInfoFile}
     )
 else()
     set(gpurtShaderSource "${originalShaderSource}")

gpurt/gpurt.h

@@ -1471,13 +1471,21 @@ class IDevice
     // @param pDispatchRaysConstants  (in/out) Non-null pointer to a DispatchRaysConstants
     // @param cpsMemoryGpuAddr        (in) GPU address pointing to the beginning of cps memory
     // @param cpsMemoryBytes          (in) Cps allocated memory size in bytes
-    //
-    // @return the required global memory allocation size in bytes
     virtual void PatchDispatchRaysConstants(
         DispatchRaysConstants* pDispatchRaysConstants,
         const gpusize          cpsMemoryGpuAddr,
         const gpusize          cpsMemoryBytes) = 0;
 
+    // Populates the GPU addresses in the InitExecuteIndirectConstants structure
+    //
+    // @param pInitExecuteIndirectConstants (in/out) Non-null pointer to a InitExecuteIndirectConstants
+    // @param cpsMemoryGpuAddr              (in) GPU address pointing to the beginning of cps memory
+    // @param cpsMemoryBytes                (in) Cps allocated memory size in bytes
+    virtual void PatchInitExecuteIndirectConstants(
+        GpuRt::InitExecuteIndirectConstants* pInitExecuteIndirectConstants,
+        const gpusize                        cpsMemoryGpuAddr,
+        const gpusize                        cpsMemoryBytes) = 0;
+
     //
     // @param cpsVideoMem          [in] Cps video memory
     // @param cpsMemoryBytes       [in] Cps allocated memory size in bytes
@@ -1630,6 +1638,8 @@ class IDevice
     // Check if a build is a good candidate for ACE offload (typically barrier-free cases)
     virtual bool ShouldUseGangedAceForBuild(const AccelStructBuildInputs& inputs) const = 0;
 
+    virtual uint32 CalculateBvhPrimitiveCount(const AccelStructBuildInputs& inputs) const = 0;
+
 protected:
 
     /// Client must create objects by explicitly calling CreateDevice method

gpurt/gpurtDispatch.h

@@ -55,6 +55,8 @@ struct DispatchRaysTopLevelData
     uint32 accelStructTrackerSrd[MaxBufferSrdSize]; // Structured buffer SRD pointing to the accel struct tracker
 };
 
+#define DISPATCHRAYSCONSTANTDATA_STRUCT_OFFSET_DISPATCHID  48
+
 // Dispatch rays constant buffer data (GPU structure). Note, using unaligned uint64_t in HLSL constant buffers requires
 // -no-legacy-cbuf-layout for cpp style structure alignment to work. But currently that support is incomplete in DXC
 // and until that is resolved we need to use uint32's explicitly.
@@ -74,7 +76,8 @@ struct DispatchRaysConstantData
     uint32 hitGroupTableBaseAddressLo;  // Hit group table base address low 32-bits
     uint32 hitGroupTableBaseAddressHi;  // Hit group table base address high 32-bits
     uint32 hitGroupTableStrideInBytes;  // Hit group table record byte stride
-    uint32 reserved0;                   // Reserved padding
+    uint32 cpsDispatchId;               // Continuations DispatchId, written in the persistent mode.
+                                        // This value should not be read via constant buffer.
     uint32 callableTableBaseAddressLo;  // Callable shader table base address low 32-bits
     uint32 callableTableBaseAddressHi;  // Callable shader table base address high 32-bits
     uint32 callableTableStrideInBytes;  // Callable shader table byte stride
@@ -96,6 +99,8 @@ struct DispatchRaysConstantData
     uint32 cpsGlobalMemoryAddressLo;    // Separate CPS stack memory base address low 32-bits
     uint32 cpsGlobalMemoryAddressHi;    // Separate CPS stack memory base address high 32-bits
     uint32 counterMask;                 // Mask for filtering ray history token
+    uint32 cpsDispatchIdAddressLo;      // Continuations cpsDispatchId address low 32-bits
+    uint32 cpsDispatchIdAddressHi;      // Continuations cpsDispatchId address high 32-bits
 };
 #pragma pack(pop)
 
@@ -109,6 +114,8 @@ struct DispatchRaysConstants
 #if __cplusplus
 static_assert((sizeof(DispatchRaysConstants) % sizeof(uint32)) == 0,
               "DispatchRaysConstants is not dword-aligned");
+static_assert(DISPATCHRAYSCONSTANTDATA_STRUCT_OFFSET_DISPATCHID == offsetof(DispatchRaysConstantData, cpsDispatchId),
+              "DISPATCHRAYSCONSTANTDATA_STRUCT_OFFSET_DISPATCHID mismatches to cpsDispatchId");
 
 constexpr uint32 DispatchRaysConstantsDw = sizeof(DispatchRaysConstants) / sizeof(uint32);
 #endif
@@ -132,6 +139,17 @@ struct InitExecuteIndirectUserData
 // Constants for InitExecuteIndirect shader
 struct InitExecuteIndirectConstants
 {
+#if __cplusplus
+    // Internal counter buffer SRDs
+    uint32 internalUavSrd[MaxSupportedIndirectCounters][MaxBufferSrdSize];
+
+    // Internal acceleration structure tracker buffer SRD.
+    uint32 accelStructTrackerSrd[MaxBufferSrdSize];
+#else
+    uint4 internalUavSrd[MaxSupportedIndirectCounters][MaxBufferSrdSize / 4];
+    uint4 accelStructTrackerSrd[MaxBufferSrdSize / 4];
+#endif
+
     uint32 inputBytesPerDispatch;   // Size of application indirect arguments
     uint32 outputBytesPerDispatch;  // Size of resulting driver internal arguments
     uint32 bindingArgsSize;         // Size of binding arguments in the app buffer preceeding the dispatch
@@ -160,18 +178,10 @@ struct InitExecuteIndirectConstants
     uint32 counterRayIdRangeBegin;  // Counter ray ID range begin
     uint32 counterRayIdRangeEnd;    // Counter ray ID range end
     uint32 cpsBackendStackSize;     // Scratch memory used by a compiler backend, start at offset 0
-    uint32 padding0;                // Padding for 16-byte alignment
+    uint32 cpsFrontendStackSize;    // Scratch memory used by IR (Intermediate Representation), for a continuation passing shader
 
-#if __cplusplus
-     // Internal counter buffer SRDs
-    uint32 internalUavSrd[MaxSupportedIndirectCounters][MaxBufferSrdSize];
-
-    // Internal acceleration structure tracker buffer SRD.
-    uint32 accelStructTrackerSrd[MaxBufferSrdSize];
-#else
-    uint4 internalUavSrd[MaxSupportedIndirectCounters][MaxBufferSrdSize / 4];
-    uint4 accelStructTrackerSrd[MaxBufferSrdSize / 4];
-#endif
+    uint32 cpsGlobalMemoryAddressLo;    // Separate CPS stack memory base address low 32-bits
+    uint32 cpsGlobalMemoryAddressHi;    // Separate CPS stack memory base address high 32-bits
 };
 
 constexpr uint32 InitExecuteIndirectConstantsDw = sizeof(InitExecuteIndirectConstants) / sizeof(uint32);
@@ -184,7 +194,7 @@ static_assert((MaxBufferSrdSize == 4), "Buffer SRD size changed, affected shader
 #endif
 static_assert((sizeof(InitExecuteIndirectConstants) % sizeof(uint32)) == 0,
               "InitExecuteIndirectConstants is not dword-aligned");
-}
+}       // namespace GpuRt
 #endif
 
 #endif

src/gpurtBvhBuilder.cpp

@@ -1629,7 +1629,7 @@ AccelStructHeader BvhBuilder::InitAccelStructHeader() const
     header.geometryType             = static_cast<uint32>(m_buildConfig.geometryType);
     header.uuidLo                   = Util::LowPart(m_deviceSettings.accelerationStructureUUID);
     header.uuidHi                   = Util::HighPart(m_deviceSettings.accelerationStructureUUID);
-    header.rtIpLevel                = uint32(m_pDevice->GetRtIpLevel());
+    header.rtIpLevel                = static_cast<uint32>(PalToGpuRtIpLevel(m_pDevice->GetRtIpLevel()));
 
     if (m_buildConfig.topLevelBuild)
     {
@@ -2313,8 +2313,8 @@ void BvhBuilder::GetAccelerationStructurePrebuildInfo(
     // the build when performing the update causing page faults.
     scratchDataSize = Util::Max(scratchDataSize, updateDataSize);
 
-    // Some applications crash when the driver reports 0 scratch size. Use 1 instead.
-    scratchDataSize = Util::Max(1u, scratchDataSize);
+    // Some applications crash when the driver reports 0 scratch size. Use 1 DWORD instead.
+    scratchDataSize = Util::Max(static_cast<uint32>(sizeof(uint32)), scratchDataSize);
 
     prebuildInfo.scratchDataSizeInBytes       = scratchDataSize;
     prebuildInfo.updateScratchDataSizeInBytes = updateDataSize;

src/gpurtDevice.cpp

@@ -467,16 +467,36 @@ Pal::Result Device::InitializeCpsMemory(
     return result;
 }
 
+//=====================================================================================================================
+// Populates the GPU addresses in the Constant structure
+template<typename ConstantsType>
+void Device::PatchConstants(ConstantsType* pConstant,
+                            const gpusize  cpsMemoryGpuAddr,
+                            const gpusize  cpsMemoryBytes)
+{
+    pConstant->cpsGlobalMemoryAddressLo = Util::LowPart(cpsMemoryGpuAddr);
+    pConstant->cpsGlobalMemoryAddressHi = Util::HighPart(cpsMemoryGpuAddr);
+
+}
+
 //=====================================================================================================================
 // Populates the GPU addresses in the DispatchRaysConstants structure
 void Device::PatchDispatchRaysConstants(
     DispatchRaysConstants* pDispatchRaysConstants,
     const gpusize          cpsMemoryGpuAddr,
     const gpusize          cpsMemoryBytes)
 {
-    pDispatchRaysConstants->constData.cpsGlobalMemoryAddressLo = Util::LowPart(cpsMemoryGpuAddr);
-    pDispatchRaysConstants->constData.cpsGlobalMemoryAddressHi = Util::HighPart(cpsMemoryGpuAddr);
+    PatchConstants(&pDispatchRaysConstants->constData, cpsMemoryGpuAddr, cpsMemoryBytes);
+}
 
+//=====================================================================================================================
+// Populates the GPU addresses in the InitExecuteIndirectConstants structure
+void Device::PatchInitExecuteIndirectConstants(
+    GpuRt::InitExecuteIndirectConstants* pInitExecuteIndirectConstants,
+    const gpusize                        cpsMemoryGpuAddr,
+    const gpusize                        cpsMemoryBytes)
+{
+    PatchConstants(pInitExecuteIndirectConstants, cpsMemoryGpuAddr, cpsMemoryBytes);
 }
 
 //=====================================================================================================================
@@ -2125,6 +2145,27 @@ bool Device::ShouldUseGangedAceForBuild(
     return shouldUseGangedAce;
 }
 
+// =====================================================================================================================
+uint32 Device::CalculateBvhPrimitiveCount(
+    const AccelStructBuildInputs& inputs
+    ) const
+{
+    // For top-level acceleration structure, inputElementCount represents the number of instances
+    uint32 primitiveCount = (inputs.type == AccelStructType::TopLevel) ? inputs.inputElemCount : 0;
+
+    if (inputs.type == AccelStructType::BottomLevel)
+    {
+        for (uint32 i = 0; i < inputs.inputElemCount; ++i)
+        {
+            const Geometry geometry = m_clientCb.pfnConvertAccelStructBuildGeometry(inputs, i);
+            const uint32 geometryPrimCount = BvhBuilder::GetGeometryPrimCount(geometry);
+            primitiveCount += geometryPrimCount;
+        }
+    }
+
+    return primitiveCount;
+}
+
 // =====================================================================================================================
 const AccelStructBuildInputs Device::OverrideBuildInputs(
     const AccelStructBuildInputs& inputs

src/gpurtInternal.h

@@ -106,6 +106,42 @@ enum EncodeFlags : uint32
     EncodeFlagFusedInstanceNode     = 0x00000008,
 };
 
+// Values should remain stable for RRA binary-compatibility (PAL equivalents do not guarantee stability)
+enum RtIpLevel : uint32
+{
+    RtIpNone        = 0x0,  ///< The device does not have an RayTracing Ip Level
+    RtIp1_0         = 0x1,  ///< First Implementation of HW RT
+    RtIp1_1         = 0x2,  ///< Added computation of triangle barycentrics into HW
+    RtIp2_0         = 0x3,  ///< Added more Hardware RayTracing features, such as BoxSort, PointerFlag, etc
+    RtIpReserved    = 0x5,  ///< Special value, should not be used
+};
+
+// =====================================================================================================================
+// Convert PAL RtIpLevel values to their GpuRT equivalent
+static RtIpLevel PalToGpuRtIpLevel(Pal::RayTracingIpLevel palRtIpLevel)
+{
+    RtIpLevel gpuRtIpLevel = RtIpLevel::RtIpNone;
+
+    switch (palRtIpLevel)
+    {
+    case Pal::RayTracingIpLevel::RtIp1_0:
+        gpuRtIpLevel = RtIpLevel::RtIp1_0;
+        break;
+    case Pal::RayTracingIpLevel::RtIp1_1:
+        gpuRtIpLevel = RtIpLevel::RtIp1_1;
+        break;
+    case Pal::RayTracingIpLevel::RtIp2_0:
+        gpuRtIpLevel = RtIpLevel::RtIp2_0;
+        break;
+    case Pal::RayTracingIpLevel::None:
+    default:
+        gpuRtIpLevel = RtIpLevel::RtIpNone;
+        break;
+    }
+
+    return gpuRtIpLevel;
+}
+
 struct RadixSortConfig
 {
     uint32 workGroupSize;
@@ -336,13 +372,21 @@ class Device : public IDevice
     // @param pDispatchRaysConstants  (in/out) Non-null pointer to a DispatchRaysConstants
     // @param cpsMemoryGpuAddr        (in) GPU address pointing to the beginning of cps memory
     // @param cpsMemoryBytes          (in) Cps allocated memory size in bytes
-    //
-    // @return the required global memory allocation size in bytes
     virtual void PatchDispatchRaysConstants(
         DispatchRaysConstants* pDispatchRaysConstants,
         const gpusize          cpsMemoryGpuAddr,
         const gpusize          cpsMemoryBytes) override;
 
+    // Populates the GPU addresses in the InitExecuteIndirectConstants structure
+    //
+    // @param pInitExecuteIndirectConstants (in/out) Non-null pointer to a InitExecuteIndirectConstants
+    // @param cpsMemoryGpuAddr              (in) GPU address pointing to the beginning of cps memory
+    // @param cpsMemoryBytes                (in) Cps allocated memory size in bytes
+    virtual void PatchInitExecuteIndirectConstants(
+        GpuRt::InitExecuteIndirectConstants* pInitExecuteIndirectConstants,
+        const gpusize                        cpsMemoryGpuAddr,
+        const gpusize                        cpsMemoryBytes) override;
+
     //
     // @param cpsVideoMem          [in] Cps video memory
     // @param cpsMemoryBytes       [in] Cps allocated memory size in bytes
@@ -683,6 +727,8 @@ class Device : public IDevice
 
     virtual bool ShouldUseGangedAceForBuild(const AccelStructBuildInputs& inputs) const override;
 
+    virtual uint32 CalculateBvhPrimitiveCount(const AccelStructBuildInputs& inputs) const override;
+
     // Returns size in DWORDs of a typed buffer view SRD
     uint32 GetTypedBufferSrdSizeDw() const { return m_typedBufferSrdSizeDw; };
 
@@ -722,6 +768,12 @@ class Device : public IDevice
 
     virtual ~Device() override;
 
+    template<typename ConstantsType>
+    void PatchConstants(
+        ConstantsType* pConstant,
+        const gpusize  cpsMemoryGpuAddr,
+        const gpusize  cpsMemoryBytes);
+
     DeviceInitInfo  m_info;
 
     Util::GenericAllocatorTracked            m_allocator;

src/gpurtTraceSource.cpp

@@ -51,7 +51,7 @@ void AccelStructTraceSource::OnTraceBegin(
     if (m_pDevice->AccelStructTrackerGpuAddr() != 0)
     {
         // Before starting the trace set tracking to enabled.
-        pCmdBuf->CmdWriteImmediate(Pal::HwPipeBottom, 1, Pal::ImmediateDataWidth::ImmediateData32Bit,
+        pCmdBuf->CmdWriteImmediate(Pal::PipelineStageBottomOfPipe, 1, Pal::ImmediateDataWidth::ImmediateData32Bit,
                                    m_pDevice->AccelStructTrackerGpuAddr() + offsetof(AccelStructTracker, enabled));
         m_pDevice->RaytracingBarrier(pCmdBuf, BarrierFlagSyncPostCpWrite);
     }
@@ -67,7 +67,7 @@ void AccelStructTraceSource::OnTraceEnd(
     if (m_pDevice->AccelStructTrackerGpuAddr() != 0)
     {
         // Disable tracking.
-        pCmdBuf->CmdWriteImmediate(Pal::HwPipeBottom, 0, Pal::ImmediateDataWidth::ImmediateData32Bit,
+        pCmdBuf->CmdWriteImmediate(Pal::PipelineStageBottomOfPipe, 0, Pal::ImmediateDataWidth::ImmediateData32Bit,
                                    m_pDevice->AccelStructTrackerGpuAddr() + offsetof(AccelStructTracker, enabled));
         m_pDevice->RaytracingBarrier(pCmdBuf, BarrierFlagSyncPostCpWrite);
     }

src/options.yaml

@@ -32,12 +32,12 @@ enum CpsCandidatePrimitiveMode:
     # Controls how candidate primitives are handled in the continuations (CPS) software Traversal loop.
     SuspendLane:  # Suspend a lane upon candidate hits and wait for other lanes to end the Traversal loop.
                   #  This is the default. Other modes are experimental and might not be implemented on all RtIps.
-    SuspendWave:  # On each Traversal iteration, check whether any lane has a candidate, and break if so.
-                  #  Only implemented for RtIp 2.0, all other cases use SuspendLane.
     DeferFirst:   # When finding the first candidate, record it and ignore it for the time being. At the end of the
                   #  Traversal loop, process pending candidates. When finding the second candidate, immediately break
                   #  out of the loop to first process the first one.
-                  #  Only implemented for triangle primitives on RtIp 2.0, all other cases use SuspendLane.
+                  #  Implementation status:
+                  #   * RtIp 1.1: Not supported, SuspendLane is always used.
+                  #   * RtIp 2.0: DeferFirst is supported, but only for triangle primitives.
 
 # ------------------------------------------------------------------------------------------------------------------
 # This is the definition of the single options struct.

src/shaders/BuildBVH.hlsl

@@ -24,7 +24,7 @@
  **********************************************************************************************************************/
 #if NO_SHADER_ENTRYPOINT == 0
 //=====================================================================================================================
-#include "../shared/rayTracingDefs.h"
+#include "../shadersClean/common/ShaderDefs.hlsli"
 
 #include "BuildRootSignature.hlsl"
 

src/shaders/BuildBVHTDTR.hlsl

@@ -188,7 +188,7 @@ struct StateTDBuild
 #define USE_LDS     1
 
 //=====================================================================================================================
-#include "../shared/rayTracingDefs.h"
+#include "../shadersClean/common/ShaderDefs.hlsli"
 
 #define GC_DSTMETADATA
 #define GC_SCRATCHBUFFER