Meg's Mirrors

zig

1	const Buffer = extern struct { value: u32 };
2	const Sampler = @SpirvType(.sampler);
3	const RuntimeArray = @SpirvType(.{ .runtime_array = u32 });
4	const SamplerRuntimeArray = @SpirvType(.{ .runtime_array = Sampler });
5	const BufferRuntimeArray = @SpirvType(.{ .runtime_array = Buffer });
6
7	const a = @extern(*addrspace(.input) const RuntimeArray, .{ .name = "a" });
8	const b = @extern(*addrspace(.uniform) const RuntimeArray, .{ .name = "b" });
9	const c = @extern(*addrspace(.storage_buffer) const RuntimeArray, .{ .name = "c" });
10	const d = @extern(*addrspace(.constant) const RuntimeArray, .{ .name = "d" });
11	const e = @extern(*addrspace(.constant) const SamplerRuntimeArray, .{
12	.name = "samplers",
13	.decoration = .{ .descriptor = .{ .set = 0, .binding = 0 } },
14	});
15	const f = @extern(*addrspace(.storage_buffer) [4]Buffer, .{
16	.name = "sized_buffers",
17	.decoration = .{ .descriptor = .{ .set = 0, .binding = 1 } },
18	});
19	const g = @extern(*addrspace(.storage_buffer) BufferRuntimeArray, .{
20	.name = "buffers",
21	.decoration = .{ .descriptor = .{ .set = 0, .binding = 2 } },
22	});
23
24	comptime {
25	_ = a;
26	}
27	comptime {
28	_ = b;
29	}
30	comptime {
31	_ = c;
32	}
33
34	export fn main() callconv(.{ .spirv_fragment = .{} }) void {
35	_ = &d[0];
36	_ = &e[0];
37	f[0].value = 1;
38	g[0].value = 2;
39	}
40
41	// error
42	// backend=selfhosted
43	// target=spirv32-vulkan
44	// cpu_features=baseline+runtime_descriptor_array
45	//
46	// :7:19: error: SPIR-V runtime array is not allowed in the 'input' address space
47	// :8:19: error: extern in 'uniform' address space must be a single-item pointer to a struct
48	// :9:19: error: extern in 'storage_buffer' address space must be a single-item pointer to a struct
49	// :10:19: error: extern in 'constant' address space must point to an opaque SPIR-V type, or to an array of one