Add support for bitfields (#3639)

* Add support for bitfields

Closes https://github.com/shader-slang/slang/issues/3559

* Set scopes for syntsized bitfield accessors

* Simplify generated code for bitfield accessors

* spelling

* regenerate vs project

* warnings

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/language-feature/bitfield/zero-width.slang b/tests/language-feature/bitfield/zero-width.slang
new file mode 100644
index 000000000..457b31456
--- /dev/null
+++ b/tests/language-feature/bitfield/zero-width.slang
@@ -0,0 +1,28 @@
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -output-using-type
+
+// CHECK:      123
+// CHECK-NEXT: 4567
+// CHECK-NEXT: 1
+// CHECK-NEXT: 0
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<uint> outputBuffer;
+
+struct S {
+    int foo : 8;
+    int breaker : 0;
+    int bar : 24;
+};
+
+[numthreads(1, 1, 1)]
+void computeMain()
+{
+    S s;
+    s.foo = 123;
+    s.bar = 4567;
+    s.breaker = 9999;
+    outputBuffer[0] = s.foo;
+    outputBuffer[1] = s.bar;
+    outputBuffer[2] = sizeof(S) == sizeof(int) * 2;
+    outputBuffer[3] = s.breaker;
+}