make hlsl and glsl outputs similar

Author: fairywreath

source/slang/slang-ir-translate-global-varying-var.cpp

@@ -153,7 +153,8 @@ struct GlobalVarTranslationContext
             builder.addLayoutDecoration(inputParam, paramLayout);
 
             // Initialize all global variables.
-            for (Index i = 0; i < inputVars.getCount(); i++)
+            // for (Index i = 0; i < inputVars.getCount(); i++)
+            for (Index i = inputVars.getCount() - 1; i >= 0; i--)
             {
                 auto input = inputVars[i];
                 setInsertBeforeOrdinaryInst(&builder, firstBlock->getFirstOrdinaryInst());

tests/glsl-intrinsic/shader-subgroup/shader-subgroup-builtin-variables-2.slang

@@ -8,14 +8,18 @@
 //TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
 buffer MyBlockName2
 {
-    uint data[];
+    int data[];
 } outputBuffer;
 
 layout(local_size_x = 4) in;
 
-void computeMain()
+void computeMain(int3 dispatchThreadID : SV_DispatchThreadID)
 {
-    int idx = gl_GlobalInvocationID.x;
+    // There may be some issues with structure padding for global context containing
+    // global builtin variables.
+    // int idx = gl_GlobalInvocationID.x;
+    int idx = dispatchThreadID.x;
+
     uint laneId = gl_SubgroupInvocationID;
     // The laneCount will be dependent on target hardware. It seems a count of 1 is valid in spec. 
     // For now we'll just check it's not 0.

tests/glsl-intrinsic/shader-subgroup/shader-subgroup-builtin-variables.slang

@@ -31,7 +31,7 @@ void computeMain()
             // Warp/wave size is not Metal devices is not (consistently) 32.
 #if defined(TARGET_METAL)
             && (gl_SubgroupSize > 0U)
-            && (gl_subgroupInvocationID > 0U)
+            && (gl_SubgroupInvocationID > 0U)
 #else
             && gl_SubgroupSize == 32
             && gl_SubgroupInvocationID == 3