36 lines
1.4 KiB
Zig
36 lines
1.4 KiB
Zig
const Instance = @import("instance.zig").Instance;
|
|
|
|
/// Verifies that a gpu.Interface implementation exposes the expected function declarations.
|
|
pub fn Interface(comptime Impl: type) type {
|
|
assertDecl(Impl, "createInstance", fn (descriptor: *const Instance.Descriptor) callconv(.Inline) Instance);
|
|
return Impl;
|
|
}
|
|
|
|
fn assertDecl(comptime Impl: anytype, comptime name: []const u8, comptime T: type) void {
|
|
if (!@hasDecl(Impl, name)) @compileError("gpu.Interface missing declaration: " ++ @typeName(T));
|
|
const Decl = @TypeOf(@field(Impl, name));
|
|
if (Decl != T) @compileError("gpu.Interface field '" ++ name ++ "'\n\texpected type: " ++ @typeName(T) ++ "\n\t found type: " ++ @typeName(Decl));
|
|
}
|
|
|
|
/// Exports C ABI function declarations for the given gpu.Interface implementation.
|
|
pub fn Export(comptime Impl: type) type {
|
|
_ = Interface(Impl); // verify implementation is a valid interface
|
|
return struct {
|
|
// WGPU_EXPORT WGPUInstance wgpuCreateInstance(WGPUInstanceDescriptor const * descriptor);
|
|
export fn wgpuCreateInstance(descriptor: *const Instance.Descriptor) Instance {
|
|
return Impl.createInstance(descriptor);
|
|
}
|
|
};
|
|
}
|
|
|
|
/// A no-operation gpu.Interface implementation.
|
|
pub const NullInterface = Interface(struct {
|
|
pub inline fn createInstance(descriptor: *const Instance.Descriptor) Instance {
|
|
_ = descriptor;
|
|
return Instance.none;
|
|
}
|
|
});
|
|
|
|
test "null" {
|
|
_ = Export(NullInterface);
|
|
}
|