Add gfx interface definition in Slang. (#2364)

* Add gfx interface definition in Slang.

- add gfx interface definitons in Slang.
- fix slang compiler to correctly type-check `out` interface argument.
- modify gfx interface to be fully COM compatible
- add convenient ShaderProgram creation methods to gfx.

* Fix compile errors and warnings.

* Update project files

* Fix cuda.

* Properly implement queryInterface in command encoder impls.

Co-authored-by: Yong He <yhe@nvidia.com>

2 files changed, 42 insertions, 0 deletions

diff --git a/tests/bugs/interface-lvalue.slang b/tests/bugs/interface-lvalue.slang
new file mode 100644
index 000000000..87cfa54ed
--- /dev/null
+++ b/tests/bugs/interface-lvalue.slang
@@ -0,0 +1,36 @@
+//TEST:EXECUTABLE:
+__target_intrinsic(cpp, "printf(\"%s\\n\", ($0).getBuffer())")
+void writeln(String text);
+
+[COM("BE18F5D2-4522-4AB0-A6EE-1D157FA2B083")]
+interface IFoo
+{
+    int method();
+};
+
+class Impl : IFoo
+{
+    __init() { }
+    int method()
+    {
+        return 0;
+    }
+}
+
+void createFoo(out IFoo val)
+{
+    Impl resuult = new Impl();
+    val = resuult;
+}
+
+public __extern_cpp int main()
+{
+    IFoo v;
+    createFoo(v);
+
+    if (v.method() == 0)
+        writeln("succ");
+    else
+        writeln("fail");
+    return 0;
+}
diff --git a/tests/bugs/interface-lvalue.slang.expected b/tests/bugs/interface-lvalue.slang.expected
new file mode 100644
index 000000000..981dcfc29
--- /dev/null
+++ b/tests/bugs/interface-lvalue.slang.expected
@@ -0,0 +1,6 @@
+result code = 0
+standard error = {
+}
+standard output = {
+succ
+}