diff --git a/include/vkd3d_d3d12.idl b/include/vkd3d_d3d12.idl
index ae0cf2ce..937eb8a6 100644
--- a/include/vkd3d_d3d12.idl
+++ b/include/vkd3d_d3d12.idl
@@ -158,6 +158,28 @@ const UINT D3D12_DS_OUTPUT_REGISTER_COMPONENTS = 4;
 const UINT D3D12_DS_OUTPUT_REGISTER_COMPONENT_BIT_COUNT = 32;
 const UINT D3D12_DS_OUTPUT_REGISTER_COUNT = 32;
 cpp_quote("#define D3D12_FLOAT32_MAX (3.402823466e+38f)")
+const UINT D3D12_GS_INPUT_INSTANCE_ID_READS_PER_INST = 2;
+const UINT D3D12_GS_INPUT_INSTANCE_ID_READ_PORTS = 1;
+const UINT D3D12_GS_INPUT_INSTANCE_ID_REGISTER_COMPONENTS = 1;
+const UINT D3D12_GS_INPUT_INSTANCE_ID_REGISTER_COMPONENT_BIT_COUNT = 32;
+const UINT D3D12_GS_INPUT_INSTANCE_ID_REGISTER_COUNT = 1;
+const UINT D3D12_GS_INPUT_PRIM_CONST_REGISTER_COMPONENTS = 1;
+const UINT D3D12_GS_INPUT_PRIM_CONST_REGISTER_COMPONENT_BIT_COUNT = 32;
+const UINT D3D12_GS_INPUT_PRIM_CONST_REGISTER_COUNT = 1;
+const UINT D3D12_GS_INPUT_PRIM_CONST_REGISTER_READS_PER_INST = 2;
+const UINT D3D12_GS_INPUT_PRIM_CONST_REGISTER_READ_PORTS = 1;
+const UINT D3D12_GS_INPUT_REGISTER_COMPONENTS = 4;
+const UINT D3D12_GS_INPUT_REGISTER_COMPONENT_BIT_COUNT = 32;
+const UINT D3D12_GS_INPUT_REGISTER_COUNT = 32;
+const UINT D3D12_GS_INPUT_REGISTER_READS_PER_INST = 2;
+const UINT D3D12_GS_INPUT_REGISTER_READ_PORTS = 1;
+const UINT D3D12_GS_INPUT_REGISTER_VERTICES = 32;
+const UINT D3D12_GS_MAX_INSTANCE_COUNT = 32;
+const UINT D3D12_GS_MAX_OUTPUT_VERTEX_COUNT_ACROSS_INSTANCES = 1024;
+const UINT D3D12_GS_OUTPUT_ELEMENTS = 32;
+const UINT D3D12_GS_OUTPUT_REGISTER_COMPONENTS = 4;
+const UINT D3D12_GS_OUTPUT_REGISTER_COMPONENT_BIT_COUNT = 32;
+const UINT D3D12_GS_OUTPUT_REGISTER_COUNT = 32;
 const UINT D3D12_IA_VERTEX_INPUT_RESOURCE_SLOT_COUNT = 32;
 const UINT D3D12_MAX_ROOT_COST = 64;
 const UINT D3D12_PACKED_TILE = 0xffffffff;