diff --git a/gpu/TODO-webgpu.h b/gpu/TODO-webgpu.h
index b02bbb81..5e417628 100644
--- a/gpu/TODO-webgpu.h
+++ b/gpu/TODO-webgpu.h
@@ -1,11 +1,5 @@
 typedef uint32_t WGPUFlags;
 
-typedef enum WGPUAlphaMode {
-    WGPUAlphaMode_Premultiplied = 0x00000000,
-    WGPUAlphaMode_Unpremultiplied = 0x00000001,
-    WGPUAlphaMode_Force32 = 0x7FFFFFFF
-} WGPUAlphaMode;
-
 typedef enum WGPUBackendType {
     WGPUBackendType_Null = 0x00000000,
     WGPUBackendType_WebGPU = 0x00000001,
diff --git a/gpu/src/main.zig b/gpu/src/main.zig
index 04c6149b..d1d82182 100644
--- a/gpu/src/main.zig
+++ b/gpu/src/main.zig
@@ -34,6 +34,8 @@ pub const SwapChain = @import("SwapChain.zig");
 pub const Texture = @import("Texture.zig");
 pub const TextureView = @import("TextureView.zig");
 
+pub const AlphaMode = @import("types.zig").AlphaMode;
+
 test {
     refAllDecls(@import("Adapter.zig"));
     refAllDecls(@import("BindGroup.zig"));
@@ -59,6 +61,7 @@ test {
     refAllDecls(@import("SwapChain.zig"));
     refAllDecls(@import("Texture.zig"));
     refAllDecls(@import("TextureView.zig"));
+    refAllDecls(@import("types.zig"));
 }
 
 fn refAllDecls(comptime T: type) void {
diff --git a/gpu/src/types.zig b/gpu/src/types.zig
new file mode 100644
index 00000000..4915560d
--- /dev/null
+++ b/gpu/src/types.zig
@@ -0,0 +1,4 @@
+pub const AlphaMode = enum(u32) {
+    premultiplied = 0x00000000,
+    unpremultiplied = 0x00000001,
+};