MSL: Rewrite how IO blocks are emitted in multi-patch mode.

Firstly, never flatten inputs or outputs in multi-patch mode.
The main scenario where we do need to care is Block IO.
In this case, we should only flatten the top-level member, and after
that we use access chains as normal.

Using structs in Input storage class is now possible as well. We don't
need to consider per-location fixups at all here. In Vulkan, IO structs
must match exactly. Only plain vectors can have smaller vector sizes as
a special case.

1 files changed, 55 insertions, 0 deletions

diff --git a/shaders-msl/tesc/complex-patch-out-types.tesc b/shaders-msl/tesc/complex-patch-out-types.tesc
new file mode 100644
index 00000000..fd56ae46
--- /dev/null
+++ b/shaders-msl/tesc/complex-patch-out-types.tesc
@@ -0,0 +1,55 @@
+#version 450
+layout(vertices = 4) out;
+
+struct Meep
+{
+	float a;
+	float b;
+};
+
+layout(location = 0) patch out float a[2];
+layout(location = 2) patch out float b;
+layout(location = 3) patch out mat2 m;
+layout(location = 5) patch out Meep meep;
+layout(location = 7) patch out Meep meeps[2];
+
+layout(location = 11) patch out Block
+{
+	float a[2];
+	float b;
+	mat2 m;
+	Meep meep;
+	Meep meeps[2];
+} B;
+
+void write_in_func()
+{
+	gl_out[gl_InvocationID].gl_Position = vec4(1.0);
+
+	a[0] = 1.0;
+	a[1] = 2.0;
+	b = 3.0;
+	m = mat2(2.0);
+	meep.a = 4.0;
+	meep.b = 5.0;
+	meeps[0].a = 6.0;
+	meeps[0].b = 7.0;
+	meeps[1].a = 8.0;
+	meeps[1].b = 9.0;
+
+	B.a[0] = 1.0;
+	B.a[1] = 2.0;
+	B.b = 3.0;
+	B.m = mat2(4.0);
+	B.meep.a = 4.0;
+	B.meep.b = 5.0;
+	B.meeps[0].a = 6.0;
+	B.meeps[0].b = 7.0;
+	B.meeps[1].a = 8.0;
+	B.meeps[1].b = 9.0;
+}
+
+void main()
+{
+	write_in_func();
+}