Add DXIL Debugger Support for Wave Broadcast Operations

HLSL
WaveReadLaneFirst()
WaveReadLaneAt()

DXIL
DXOp::WaveReadLaneAt
DXOp::WaveReadLaneFirst

Author: Zorro666

renderdoc/driver/shaders/dxil/dxil_debug.cpp

@@ -3682,6 +3682,45 @@ bool ThreadState::ExecuteInstruction(DebugAPIWrapper *apiWrapper,
             result.value.u32v[0] = (m_WorkgroupIndex == activeLanes[0]) ? 1 : 0;
             break;
           }
+          case DXOp::WaveReadLaneAt:
+          {
+            // WaveReadLaneAt(value,lane)
+            ShaderVariable arg;
+            RDCASSERT(GetShaderVariable(inst.args[2], opCode, dxOpCode, arg));
+            const uint32_t firstLaneInSub = m_WorkgroupIndex - m_SubgroupIdx;
+            uint32_t lane = firstLaneInSub + arg.value.u32v[0];
+
+            if(lane < workgroup.size())
+            {
+              ShaderVariable var;
+              RDCASSERT(workgroup[lane].GetShaderVariable(inst.args[1], opCode, dxOpCode, var));
+              result.value = var.value;
+            }
+            else
+            {
+              RDCERR("Invalid workgroup lane %u", lane);
+            }
+            break;
+          }
+          case DXOp::WaveReadLaneFirst:
+          {
+            // WaveReadLaneFirst(value)
+            // determine active lane indices in our subgroup
+            rdcarray<uint32_t> activeLanes;
+            GetSubgroupActiveLanes(activeMask, workgroup, activeLanes);
+            uint32_t lane = activeLanes[0];
+            if(lane < workgroup.size())
+            {
+              ShaderVariable var;
+              RDCASSERT(workgroup[lane].GetShaderVariable(inst.args[1], opCode, dxOpCode, var));
+              result.value = var.value;
+            }
+            else
+            {
+              RDCERR("Invalid workgroup lane %u", lane);
+            }
+            break;
+          }
           case DXOp::WaveAnyTrue:
           case DXOp::WaveAllTrue:
           case DXOp::WaveActiveBallot:
@@ -4092,8 +4131,6 @@ bool ThreadState::ExecuteInstruction(DebugAPIWrapper *apiWrapper,
 
           // Wave Operations
           case DXOp::WaveActiveAllEqual:
-          case DXOp::WaveReadLaneAt:
-          case DXOp::WaveReadLaneFirst:
           case DXOp::WaveActiveBit:
           case DXOp::WavePrefixOp:
           case DXOp::WaveAllBitCount:

renderdoc/driver/shaders/dxil/dxil_reflect.cpp

@@ -1870,13 +1870,15 @@ rdcstr Program::GetDebugStatus()
                       "Only supported when debugging pixel shaders dx.op call `%s` %s",
                       callFunc->name.c_str(), ToStr(dxOpCode).c_str());
                 continue;
-              case DXOp::WaveGetLaneCount:
-              case DXOp::WaveGetLaneIndex:
               case DXOp::WaveIsFirstLane:
-              case DXOp::WaveActiveOp:
+              case DXOp::WaveGetLaneIndex:
+              case DXOp::WaveGetLaneCount:
               case DXOp::WaveAnyTrue:
               case DXOp::WaveAllTrue:
               case DXOp::WaveActiveBallot:
+              case DXOp::WaveReadLaneAt:
+              case DXOp::WaveReadLaneFirst:
+              case DXOp::WaveActiveOp:
                 if(!D3D_Hack_EnableGroups())
                   return StringFormat::Fmt("Unsupported dx.op call `%s` %s", callFunc->name.c_str(),
                                            ToStr(dxOpCode).c_str());
@@ -1902,8 +1904,6 @@ rdcstr Program::GetDebugStatus()
               case DXOp::OutputControlPointID:
               case DXOp::CycleCounterLegacy:
               case DXOp::WaveActiveAllEqual:
-              case DXOp::WaveReadLaneAt:
-              case DXOp::WaveReadLaneFirst:
               case DXOp::WaveActiveBit:
               case DXOp::WavePrefixOp:
               case DXOp::WaveAllBitCount: