Assign the DeviceIndex builtIn (ext: SPV_KHR_device_group).

src/Pipeline/ComputeProgram.cpp

@@ -97,6 +97,13 @@ namespace sw
 			ASSERT(builtin.SizeInComponents == 1);
 			value[builtin.FirstComponent] = As<SIMD::Float>(SIMD::Int(0, 1, 2, 3));
 		});
+
+		setInputBuiltin(spv::BuiltInDeviceIndex, [&](const SpirvShader::BuiltinMapping& builtin, Array<SIMD::Float>& value)
+		{
+			ASSERT(builtin.SizeInComponents == 1);
+			// Only a single physical device is supported.
+			value[builtin.FirstComponent] = As<SIMD::Float>(SIMD::Int(0, 0, 0, 0));
+		});
 	}
 
 	void ComputeProgram::setSubgroupBuiltins(Int workgroupID[3], SIMD::Int localInvocationIndex, Int subgroupIndex)

src/Pipeline/PixelProgram.cpp

@@ -50,6 +50,14 @@ namespace sw
 			ASSERT(it->second.SizeInComponents == 1);
 			routine.getVariable(it->second.Id)[it->second.FirstComponent] = As<SIMD::Float>(SIMD::Int(0, 1, 2, 3));
 		}
+
+		it = spirvShader->inputBuiltins.find(spv::BuiltInDeviceIndex);
+		if (it != spirvShader->inputBuiltins.end())
+		{
+			ASSERT(it->second.SizeInComponents == 1);
+			// Only a single physical device is supported.
+			routine.getVariable(it->second.Id)[it->second.FirstComponent] = As<SIMD::Float>(SIMD::Int(0, 0, 0, 0));
+		}
 	}
 
 	void PixelProgram::applyShader(Int cMask[4])

src/Pipeline/SpirvShader.cpp

@@ -932,6 +932,7 @@ namespace sw
 				if (!strcmp(ext, "SPV_KHR_shader_draw_parameters")) break;
 				if (!strcmp(ext, "SPV_KHR_16bit_storage")) break;
 				if (!strcmp(ext, "SPV_KHR_variable_pointers")) break;
+				if (!strcmp(ext, "SPV_KHR_device_group")) break;
 				UNSUPPORTED("SPIR-V Extension: %s", ext);
 				break;
 			}

src/Pipeline/VertexProgram.cpp

@@ -59,6 +59,14 @@ namespace sw
 			ASSERT(it->second.SizeInComponents == 1);
 			routine.getVariable(it->second.Id)[it->second.FirstComponent] = As<SIMD::Float>(SIMD::Int(0, 1, 2, 3));
 		}
+
+		it = spirvShader->inputBuiltins.find(spv::BuiltInDeviceIndex);
+		if (it != spirvShader->inputBuiltins.end())
+		{
+			ASSERT(it->second.SizeInComponents == 1);
+			// Only a single physical device is supported.
+			routine.getVariable(it->second.Id)[it->second.FirstComponent] = As<SIMD::Float>(SIMD::Int(0, 0, 0, 0));
+		}
 	}
 
 	VertexProgram::~VertexProgram()