Add support for OpKill

src/Pipeline/PixelProgram.cpp

@@ -47,6 +47,14 @@ namespace sw
 
 		clampColor(c);
 
+		if(spirvShader->getModes().ContainsKill)
+		{
+			for (auto i = 0u; i < state.multiSample; i++)
+			{
+				cMask[i] &= ~routine.killMask;
+			}
+		}
+
 		if(spirvShader->getModes().DepthReplacing)
 		{
 			oDepth = Min(Max(oDepth, Float4(0.0f)), Float4(1.0f));

src/Pipeline/SpirvShader.cpp

@@ -1681,6 +1681,9 @@ namespace sw
 		case spv::OpReturn:
 			return EmitReturn(insn, state);
 
+		case spv::OpKill:
+			return EmitKill(insn, state);
+
 		default:
 			UNIMPLEMENTED("opcode: %s", OpcodeName(insn.opcode()).c_str());
 			break;
@@ -3028,6 +3031,13 @@ namespace sw
 		return EmitResult::Terminator;
 	}
 
+	SpirvShader::EmitResult SpirvShader::EmitKill(InsnIterator insn, EmitState *state) const
+	{
+		state->routine->killMask |= SignMask(state->activeLaneMask());
+		state->setActiveLaneMask(SIMD::Int(0));
+		return EmitResult::Terminator;
+	}
+
 	SpirvShader::EmitResult SpirvShader::EmitPhi(InsnIterator insn, EmitState *state) const
 	{
 		auto routine = state->routine;

src/Pipeline/SpirvShader.hpp

@@ -630,6 +630,7 @@ namespace sw
 		EmitResult EmitSwitch(InsnIterator insn, EmitState *state) const;
 		EmitResult EmitUnreachable(InsnIterator insn, EmitState *state) const;
 		EmitResult EmitReturn(InsnIterator insn, EmitState *state) const;
+		EmitResult EmitKill(InsnIterator insn, EmitState *state) const;
 		EmitResult EmitPhi(InsnIterator insn, EmitState *state) const;
 
 		// OpcodeName() returns the name of the opcode op.
@@ -661,6 +662,7 @@ namespace sw
 
 		std::array<Pointer<Byte>, vk::MAX_BOUND_DESCRIPTOR_SETS> descriptorSets;
 		Pointer<Byte> pushConstants;
+		Int killMask = Int{0};
 
 		void createLvalue(SpirvShader::Object::ID id, uint32_t size)
 		{