Varying inputs and outputs for wgsl (#5669)

Closes https://github.com/shader-slang/slang/issues/5067

New tests, covering what's declared supported in the WGSL support docs

- tests/wgsl/semantic-coverage.slang
- tests/wgsl/semantic-depth.slang
- tests/wgsl/semantic-dispatch-thread-id.slang
- tests/wgsl/semantic-group-id.slang
- tests/wgsl/semantic-group-index.slang
- tests/wgsl/semantic-group-thread-id.slang
- tests/wgsl/semantic-instance-id.slang
- tests/wgsl/semantic-is-front-face.slang
- tests/wgsl/semantic-position.slang
- tests/wgsl/semantic-sample-index.slang
- tests/wgsl/semantic-vertex-id.slang

WGSL enabled existing tests:
- tests/compute/compile-time-loop.slang
- tests/compute/constexpr.slang
- tests/compute/discard-stmt.slang
- tests/metal/nested-struct-fragment-input.slang
- tests/metal/nested-struct-fragment-output.slang
- tests/metal/nested-struct-multi-entry-point-vertex.slang
- tests/metal/no-struct-vertex-output.slang
- tests/metal/sv_target-complex-1.slang
- tests/metal/sv_target-complex-2.slang
- tests/bugs/texture2d-gather.hlsl
- tests/render/cross-compile-entry-point.slang
- tests/render/nointerpolation.hlsl
- tests/render/render0.hlsl
- tests/render/cross-compile0.hlsl
- tests/render/imported-parameters.hlsl
- tests/render/unused-discard.hlsl

Can't be enabled due to missing wgsl features

- tests/compute/texture-sampling.slang

Co-authored-by: Yong He <yonghe@outlook.com>

11 files changed, 120 insertions, 0 deletions

diff --git a/tests/wgsl/semantic-coverage.slang b/tests/wgsl/semantic-coverage.slang
new file mode 100644
index 000000000..722f7180c
--- /dev/null
+++ b/tests/wgsl/semantic-coverage.slang
@@ -0,0 +1,16 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage fragment -entry main
+
+//WGSL-DAG: @builtin(sample_mask)
+//WGSL-DAG: @fragment
+
+struct Out 
+{
+    uint coverage : SV_Coverage;
+};
+
+Out main() 
+{
+    Out output;
+    output.coverage = 1;
+    return output;
+}
diff --git a/tests/wgsl/semantic-depth.slang b/tests/wgsl/semantic-depth.slang
new file mode 100644
index 000000000..65b29600a
--- /dev/null
+++ b/tests/wgsl/semantic-depth.slang
@@ -0,0 +1,16 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage fragment -entry main
+
+//WGSL-DAG: @builtin(frag_depth)
+//WGSL-DAG: @fragment
+
+struct Out 
+{
+    float depth : SV_Depth;
+};
+
+Out main() 
+{
+    Out output;
+    output.depth = 1.0;
+    return output;
+}
diff --git a/tests/wgsl/semantic-dispatch-thread-id.slang b/tests/wgsl/semantic-dispatch-thread-id.slang
new file mode 100644
index 000000000..9216c02da
--- /dev/null
+++ b/tests/wgsl/semantic-dispatch-thread-id.slang
@@ -0,0 +1,9 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage compute -entry main
+
+//WGSL-DAG: @builtin(global_invocation_id)
+//WGSL-DAG: @compute
+
+void main(uint3 dtid : SV_DispatchThreadID) 
+{
+    // Empty compute shader
+}
diff --git a/tests/wgsl/semantic-group-id.slang b/tests/wgsl/semantic-group-id.slang
new file mode 100644
index 000000000..d83f85d8e
--- /dev/null
+++ b/tests/wgsl/semantic-group-id.slang
@@ -0,0 +1,9 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage compute -entry main
+
+//WGSL-DAG: @builtin(workgroup_id)
+//WGSL-DAG: @compute
+
+void main(uint3 gid : SV_GroupID) 
+{
+    // Empty compute shader
+}
diff --git a/tests/wgsl/semantic-group-index.slang b/tests/wgsl/semantic-group-index.slang
new file mode 100644
index 000000000..06429ff39
--- /dev/null
+++ b/tests/wgsl/semantic-group-index.slang
@@ -0,0 +1,9 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage compute -entry main
+
+//WGSL-DAG: @builtin(local_invocation_index)
+//WGSL-DAG: @compute
+
+void main(uint idx : SV_GroupIndex) 
+{
+    // Empty compute shader
+}
diff --git a/tests/wgsl/semantic-group-thread-id.slang b/tests/wgsl/semantic-group-thread-id.slang
new file mode 100644
index 000000000..7646397d0
--- /dev/null
+++ b/tests/wgsl/semantic-group-thread-id.slang
@@ -0,0 +1,9 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage compute -entry main
+
+//WGSL-DAG: @builtin(local_invocation_id)
+//WGSL-DAG: @compute
+
+void main(uint3 gtid : SV_GroupThreadID) 
+{
+    // Empty compute shader
+}
diff --git a/tests/wgsl/semantic-instance-id.slang b/tests/wgsl/semantic-instance-id.slang
new file mode 100644
index 000000000..868d9149d
--- /dev/null
+++ b/tests/wgsl/semantic-instance-id.slang
@@ -0,0 +1,9 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage vertex -entry main
+
+//WGSL-DAG: @builtin(instance_index)
+//WGSL-DAG: @vertex
+
+float4 main(uint instanceID : SV_InstanceID) : SV_Position 
+{
+    return float4(1,1,1,1);
+}
diff --git a/tests/wgsl/semantic-is-front-face.slang b/tests/wgsl/semantic-is-front-face.slang
new file mode 100644
index 000000000..d79ab672b
--- /dev/null
+++ b/tests/wgsl/semantic-is-front-face.slang
@@ -0,0 +1,9 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage fragment -entry main
+
+//WGSL-DAG: @builtin(front_facing)
+//WGSL-DAG: @fragment
+
+float4 main(bool isFront : SV_IsFrontFace) : SV_Target 
+{
+    return float4(1,1,1,1);
+}
diff --git a/tests/wgsl/semantic-position.slang b/tests/wgsl/semantic-position.slang
new file mode 100644
index 000000000..28c047a04
--- /dev/null
+++ b/tests/wgsl/semantic-position.slang
@@ -0,0 +1,16 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage vertex -entry main
+
+//WGSL-DAG: @builtin(position)
+//WGSL-DAG: @vertex
+
+struct S 
+{
+    float4 position : SV_Position;
+};
+
+S main() 
+{
+    S output;
+    output.position = float4(0,0,0,1);
+    return output;
+}
diff --git a/tests/wgsl/semantic-sample-index.slang b/tests/wgsl/semantic-sample-index.slang
new file mode 100644
index 000000000..bd347d94f
--- /dev/null
+++ b/tests/wgsl/semantic-sample-index.slang
@@ -0,0 +1,9 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage fragment -entry main
+
+//WGSL-DAG: @builtin(sample_index)
+//WGSL-DAG: @fragment
+
+float4 main(uint sampleIndex : SV_SampleIndex) : SV_Target 
+{
+    return float4(1,1,1,1);
+}
diff --git a/tests/wgsl/semantic-vertex-id.slang b/tests/wgsl/semantic-vertex-id.slang
new file mode 100644
index 000000000..4120dc098
--- /dev/null
+++ b/tests/wgsl/semantic-vertex-id.slang
@@ -0,0 +1,9 @@
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage vertex -entry main
+
+//WGSL-DAG: @builtin(vertex_index)
+//WGSL-DAG: @vertex
+
+float4 main(uint vertexID : SV_VertexID) : SV_Position 
+{
+    return float4(1,1,1,1);
+}