Add Vulkan translations for HLSL barrier operations (#737)

Fixes #730

The most basic of these already had translations added, and the Slang approach to cross-compilation made adding the new ones almost trivial. I also took the time to confirm that using "operator comma" for the sequencing (since the single HLSL function call needs to expand to a sequence of GLSL function calls) works fine with glslang.

I added a test case to confirm that all of these operations can compile down to SPIR-V.

I am not personally confident that these translations are perfect, but they are based on what was [linked](https://anteru.net/blog/2016/mapping-between-hlsl-and-glsl/index.html) from #730. The one difference is where that blog post was listing `memoryBarrierImage, memoryBarrierImage` I assumed they meant `memoryBarrierImage, memoryBarrierBuffer`.

2 files changed, 28 insertions, 0 deletions

diff --git a/tests/cross-compile/barriers.slang b/tests/cross-compile/barriers.slang
new file mode 100644
index 000000000..f6fb9ac3c
--- /dev/null
+++ b/tests/cross-compile/barriers.slang
@@ -0,0 +1,14 @@
+//TEST:CROSS_COMPILE:-target spirv-assembly -entry main -stage compute
+
+// Confirm that all HLSL barrier operations can be used when cross-compiling.
+
+[numthreads(1,1,1)]
+void main()
+{
+	AllMemoryBarrier();
+	AllMemoryBarrierWithGroupSync();
+	DeviceMemoryBarrier();
+	DeviceMemoryBarrierWithGroupSync();
+	GroupMemoryBarrier();
+	GroupMemoryBarrierWithGroupSync();
+}
diff --git a/tests/cross-compile/barriers.slang.glsl b/tests/cross-compile/barriers.slang.glsl
new file mode 100644
index 000000000..281e684db
--- /dev/null
+++ b/tests/cross-compile/barriers.slang.glsl
@@ -0,0 +1,14 @@
+#version 450
+
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+void main()
+{
+    (memoryBarrier(), groupMemoryBarrier(), memoryBarrierImage(), memoryBarrierBuffer());
+    (memoryBarrier(), groupMemoryBarrier(), memoryBarrierImage(), memoryBarrierBuffer(), barrier());
+    (memoryBarrier(), memoryBarrierImage(), memoryBarrierBuffer());
+    (memoryBarrier(), memoryBarrierImage(), memoryBarrierBuffer(), barrier());
+    groupMemoryBarrier();
+    (groupMemoryBarrier(), barrier());
+
+    return;
+}