diff --git a/generator/spirv/registry.zig b/generator/spirv/registry.zig
new file mode 100644
index 0000000..0016fe4
--- /dev/null
+++ b/generator/spirv/registry.zig
@@ -0,0 +1,65 @@
+// See https://www.khronos.org/registry/spir-v/specs/unified1/MachineReadableGrammar.html
+
+pub const Registry = struct {
+    copyright: []const u8,
+    registry_type: RegistryType,
+    instruction: []Instruction,
+    operand_kinds: []OperandKind,
+};
+
+pub const RegistryType = union(enum) {
+    core: struct {
+        magic_number: u32,
+        major_version: u32,
+        minor_version: u32,
+        revision: u32,
+    },
+    extension: struct {
+        version: u32,
+        revision: u32,
+    },
+};
+
+pub const Instruction = struct {
+    opname: []const u8,
+    opcode: u32,
+    operands: []Operand,
+    capabilities: [][]const u8,
+};
+
+pub const Operand = struct {
+    kind: []const u8,
+    quantifier: Quantifier,
+    name: []const u8,
+};
+
+pub const Quantifier = enum {
+    one,
+    zero_or_one,
+    zero_or_more,
+};
+
+pub const OperandCategory = union(enum) {
+    bit_enum: []Enumerant,
+    value_enum: []Enumerant,
+    id,
+    literal,
+    composite: Composite,
+};
+
+pub const OperandKind = struct {
+    category: OperandCategory,
+    name: []const u8,
+    doc: []const u8,
+};
+
+pub const Enumerant = struct {
+    name: []const u8,
+    value: u32, // A power of 2 for `.bit_enum`.
+    capabilities: [][]const u8,
+    parameters: []Operand, // `quantifier` will always be `.one`.
+};
+
+pub const Composite = struct {
+    bases: [][]const u8,
+};