GLSL SSBO Support (#3400)

* Squash warnings and fix build with SLANG_EMBED_STDLIB

* Add GLSLShaderStorageBuffer magic wrapper

* Make GLSLSSBO not a uniform type

* Buffers are global variables

* Allow creating ssbo aggregate types

* Allow reading from RWSB using builder

* Nicer debug printing for ssbos

* Lower SSBO to RWSB

* Parse interface blocks into wrapped structs

* Lower Interface Block Decls to structs

* remove comment

* Two simple ssbo tests

* Move ssbo pass earlier

* Correct mutable buffer detection

* Do not replace ssbo usages outside of blocks

* Treat GLSLSSBO as a mutable buffer for type layouts

* regenerate vs projects

* Correctly detect ssbo types

* Diagnose illegal ssbo

* remove unreachable code

* neaten

* ci wobble

* Make GLSLSSBO ast handling more uniform

* Add modifier cases for glsl

* Use empty val info for unhandled interface blocks

necessary for ./tests/glsl/out-binding-redeclaration.slang

* more sophisticated modifier check

* Correct ssbo wrapper name

2 files changed, 36 insertions, 0 deletions

diff --git a/tests/glsl/ssbo-2.slang b/tests/glsl/ssbo-2.slang
new file mode 100644
index 000000000..11542a539
--- /dev/null
+++ b/tests/glsl/ssbo-2.slang
@@ -0,0 +1,20 @@
+//TEST:SIMPLE(filecheck=CHECK): -target spirv -stage compute -entry main -allow-glsl
+#version 430
+precision highp float;
+precision highp int;
+
+layout(binding = 0) buffer MyBlockName
+{
+    vec4 a;
+    float b;
+    int c;
+} output_data;
+
+layout(local_size_x = 4) in;
+void main()
+{
+    output_data.a = vec4(gl_GlobalInvocationID, 1);
+    output_data.b = 10;
+    output_data.c = 20;
+    // CHECK: OpEntryPoint
+}
diff --git a/tests/glsl/ssbo.slang b/tests/glsl/ssbo.slang
new file mode 100644
index 000000000..47084a823
--- /dev/null
+++ b/tests/glsl/ssbo.slang
@@ -0,0 +1,16 @@
+//TEST:SIMPLE(filecheck=CHECK): -target spirv -stage compute -entry main -allow-glsl
+#version 430
+precision highp float;
+precision highp int;
+
+layout(binding = 0) buffer MyBlockName
+{
+    vec4 data[];
+} output_data;
+
+layout(local_size_x = 4) in;
+void main()
+{
+    output_data.data[gl_GlobalInvocationID.x] = vec4(gl_GlobalInvocationID, 1);
+    // CHECK: OpEntryPoint
+}