Add base vertex and base instance system values (#5918)

* Add base vertex and base instance system values

* Fixed incorrect stage in tests

2 files changed, 53 insertions, 0 deletions

diff --git a/tests/glsl-intrinsic/system-values-draw-parameters.slang b/tests/glsl-intrinsic/system-values-draw-parameters.slang
new file mode 100644
index 000000000..a58305c13
--- /dev/null
+++ b/tests/glsl-intrinsic/system-values-draw-parameters.slang
@@ -0,0 +1,19 @@
+//TEST:SIMPLE(filecheck=CHECK_SPIRV): -entry main -stage vertex -target spirv
+//TEST:SIMPLE(filecheck=CHECK_GLSL): -entry main -stage vertex -target glsl
+//TEST:SIMPLE(filecheck=CHECK_HLSL): -entry main -stage vertex -target hlsl
+//TEST:SIMPLE(filecheck=CHECK_METAL): -entry main -stage vertex -target metal
+
+#version 460
+
+void main()
+{
+    float x = float(gl_VertexIndex + gl_BaseVertex) * 0.1f;
+    float y = float(gl_InstanceIndex + gl_BaseInstance) * 0.2f;
+    gl_Position = vec4(x, y, 0.0f, 1.0f); // Output 2D position with z=0 and w=1.
+
+    // CHECK_SPIRV: BuiltIn BaseInstance
+    // CHECK_GLSL: gl_BaseInstance
+    // CHECK_HLSL: SV_StartInstanceLocation
+    // CHECK_METAL: base_instance
+}
+
diff --git a/tests/hlsl-intrinsic/system-values-draw-parameters.slang b/tests/hlsl-intrinsic/system-values-draw-parameters.slang
new file mode 100644
index 000000000..ea84ac116
--- /dev/null
+++ b/tests/hlsl-intrinsic/system-values-draw-parameters.slang
@@ -0,0 +1,34 @@
+//TEST:SIMPLE(filecheck=CHECK_SPIRV): -entry main -stage vertex -target spirv
+//TEST:SIMPLE(filecheck=CHECK_GLSL): -entry main -stage vertex -target glsl
+//TEST:SIMPLE(filecheck=CHECK_HLSL): -entry main -stage vertex -target hlsl
+//TEST:SIMPLE(filecheck=CHECK_METAL): -entry main -stage vertex -target metal
+
+struct VSInput
+{
+    uint vertexID : SV_VertexID;
+    uint instanceID : SV_InstanceID;
+};
+
+struct VSOutput
+{
+    float4 position : SV_POSITION;
+};
+
+VSOutput main(VSInput input, 
+              uint startVertexLocation : SV_StartVertexLocation, 
+              uint startInstanceLocation : SV_StartInstanceLocation)
+{
+    VSOutput output;
+
+    float x = (float)(input.vertexID + startVertexLocation) * 0.1f;
+    float y = (float)(input.instanceID + startInstanceLocation) * 0.2f;
+    output.position = float4(x, y, 0.0f, 1.0f);
+
+    // CHECK_SPIRV: BuiltIn BaseInstance
+    // CHECK_GLSL: gl_BaseInstance
+    // CHECK_HLSL: SV_StartInstanceLocation
+    // CHECK_METAL: base_instance
+
+    return output;
+}
+