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Allow derivatives in coalescing nodes #7942

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88bfb7d
Allow derivatives in coalescing nodes
pow2clk Nov 21, 2025
3486264
update validation error to match requirements
pow2clk Dec 4, 2025
3400d7e
simplify test
pow2clk Dec 5, 2025
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9 changes: 4 additions & 5 deletions lib/DxilValidation/DxilValidation.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5449,12 +5449,11 @@ struct CompatibilityChecker {
MaskForDeriv |=
static_cast<uint32_t>(ConflictFlags::DerivInComputeShaderModel);
} else if (ShaderKind == DXIL::ShaderKind::Node) {
// Only broadcasting launch supports derivatives.
if (Props.Node.LaunchType != DXIL::NodeLaunchType::Broadcasting)
MaskForDeriv |= static_cast<uint32_t>(ConflictFlags::DerivLaunch);
// Thread launch node has no group.
if (Props.Node.LaunchType == DXIL::NodeLaunchType::Thread)
// Thread launch node has no group and doesn't support derivatives.
if (Props.Node.LaunchType == DXIL::NodeLaunchType::Thread) {
MaskForGroup |= static_cast<uint32_t>(ConflictFlags::RequiresGroup);
MaskForDeriv |= static_cast<uint32_t>(ConflictFlags::DerivLaunch);
}
}

if (ShaderKind == DXIL::ShaderKind::Mesh ||
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32 changes: 27 additions & 5 deletions tools/clang/test/HLSLFileCheck/hlsl/objects/Texture/derivatives_in_csmsas.hlsl
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@@ -1,13 +1,17 @@
// RUN: %dxc -DSTAGE=1 -T cs_6_6 %s | FileCheck %s
// RUN: %dxc -DSTAGE=2 -T as_6_6 %s | FileCheck %s -check-prefixes=CHECK,ASMSCHECK
// RUN: %dxc -DSTAGE=3 -T ms_6_6 %s | FileCheck %s -check-prefixes=CHECK,ASMSCHECK
// RUN: %dxc -DSTAGE=4 -T lib_6_8 %s | FileCheck %s
// RUN: %dxc -DSTAGE=5 -T lib_6_8 %s | FileCheck %s
// RUN: %dxilver 1.6 | %dxc -DSTAGE=1 -T cs_6_5 -Wno-hlsl-availability %s | FileCheck %s -check-prefix=ERRCHECK
// RUN: %dxilver 1.6 | %dxc -DSTAGE=2 -T as_6_5 -Wno-hlsl-availability %s | FileCheck %s -check-prefix=ERRCHECK
// RUN: %dxilver 1.6 | %dxc -DSTAGE=3 -T ms_6_5 -Wno-hlsl-availability %s | FileCheck %s -check-prefix=ERRCHECK

#define CS 1
#define AS 2
#define MS 3
#define BNS 4
#define CNS 5

// Test 6.6 feature allowing derivative operations in compute shaders

Expand All @@ -20,13 +24,31 @@ SamplerState samp : register(s5);
SamplerComparisonState cmpSamp : register(s6);
float cmpVal;


struct NodeRecord {
uint w, h;
};


[numthreads( 8, 8, 1 )]
#if STAGE==MS
[outputtopology("triangle")]
#elif STAGE==BNS
[Shader("node")]
[NodeLaunch("broadcasting")]
[NodeDispatchGrid(1, 1, 1)]
#elif STAGE==CNS
[Shader("node")]
[NodeLaunch("coalescing")]
#endif
void main( uint GI : SV_GroupIndex, uint2 GTid : SV_GroupThreadID
#if STAGE==BNS
, DispatchNodeInputRecord<NodeRecord> inputData
#elif STAGE==CNS
, [MaxRecords(4)] GroupNodeInputRecords<NodeRecord> inputRecords
#endif
void main( uint GI : SV_GroupIndex, uint3 DTid : SV_DispatchThreadID )
{
float2 uv = DTid.xy/float2(8, 8);
) {
float2 uv = GTid.xy/float2(8, 8);
float4 res = 0;
uint status = 0;

Expand Down Expand Up @@ -100,8 +122,8 @@ void main( uint GI : SV_GroupIndex, uint3 DTid : SV_DispatchThreadID )
// ERRCHECK: error: opcode 'Derivatives in CS/MS/AS' should only be used in 'Shader Model 6.6+'
res += input.SampleCmp(cmpSamp, uv, cmpVal);
res += input.SampleCmp(cmpSamp, uv, cmpVal, uint2(-3, 4));
res += input.SampleCmp(cmpSamp, uv, cmpVal, uint2(-4, 6), DTid.z);
res += input.SampleCmp(cmpSamp, uv, cmpVal, uint2(-5, 7), DTid.z, status);
res += input.SampleCmp(cmpSamp, uv, cmpVal, uint2(-4, 6), GI);
res += input.SampleCmp(cmpSamp, uv, cmpVal, uint2(-5, 7), GI, status);
res *= status;

#if STAGE == AS
Expand Down