Add support for float spec const vector initialization

Test/baseResults/vulkan.ast.vert.out

@@ -102,18 +102,18 @@ Shader version: 450
 0:38            2 (const int)
 0:38          'sci2' ( specialization-constant const highp int)
 0:38            2 (const int)
-0:40      Construct vec2 ( temp 2-component vector of float)
+0:40      Construct vec2 ( specialization-constant const 2-component vector of float)
 0:40        'scf1' ( specialization-constant const highp float)
 0:40          1.000000
 0:40        'scf1' ( specialization-constant const highp float)
 0:40          1.000000
 0:41      Construct vec2 ( temp 2-element array of 2-component vector of float)
-0:41        Construct vec2 ( temp 2-component vector of float)
+0:41        Construct vec2 ( specialization-constant const 2-component vector of float)
 0:41          'scf1' ( specialization-constant const highp float)
 0:41            1.000000
 0:41          'scf1' ( specialization-constant const highp float)
 0:41            1.000000
-0:41        Construct vec2 ( temp 2-component vector of float)
+0:41        Construct vec2 ( specialization-constant const 2-component vector of float)
 0:41          'scf1' ( specialization-constant const highp float)
 0:41            1.000000
 0:41          'scf1' ( specialization-constant const highp float)
@@ -233,18 +233,18 @@ Shader version: 450
 0:38            2 (const int)
 0:38          'sci2' ( specialization-constant const highp int)
 0:38            2 (const int)
-0:40      Construct vec2 ( temp 2-component vector of float)
+0:40      Construct vec2 ( specialization-constant const 2-component vector of float)
 0:40        'scf1' ( specialization-constant const highp float)
 0:40          1.000000
 0:40        'scf1' ( specialization-constant const highp float)
 0:40          1.000000
 0:41      Construct vec2 ( temp 2-element array of 2-component vector of float)
-0:41        Construct vec2 ( temp 2-component vector of float)
+0:41        Construct vec2 ( specialization-constant const 2-component vector of float)
 0:41          'scf1' ( specialization-constant const highp float)
 0:41            1.000000
 0:41          'scf1' ( specialization-constant const highp float)
 0:41            1.000000
-0:41        Construct vec2 ( temp 2-component vector of float)
+0:41        Construct vec2 ( specialization-constant const 2-component vector of float)
 0:41          'scf1' ( specialization-constant const highp float)
 0:41            1.000000
 0:41          'scf1' ( specialization-constant const highp float)
@@ -303,6 +303,9 @@ Shader version: 450
               41:     14(int) Constant 2
               42:             TypeArray 37(ivec2) 41
               44:             TypeVector 6(float) 2
+              45:   44(fvec2) SpecConstantComposite 7(scf1) 7(scf1)
+              46:   44(fvec2) SpecConstantComposite 7(scf1) 7(scf1)
+              47:   44(fvec2) SpecConstantComposite 7(scf1) 7(scf1)
               48:             TypeArray 44(fvec2) 41
          4(main):           2 Function None 3
                5:             Label
@@ -317,9 +320,6 @@ Shader version: 450
               32:     8(bool) FOrdGreaterThan 7(scf1) 7(scf1)
               34:     8(bool) FUnordNotEqual 7(scf1) 7(scf1)
               43:          42 CompositeConstruct 39 40
-              45:   44(fvec2) CompositeConstruct 7(scf1) 7(scf1)
-              46:   44(fvec2) CompositeConstruct 7(scf1) 7(scf1)
-              47:   44(fvec2) CompositeConstruct 7(scf1) 7(scf1)
               49:          48 CompositeConstruct 46 47
                               Return
                               FunctionEnd

Test/vulkan.ast.vert

@@ -37,6 +37,6 @@ void main()
     ivec2(sci2, sci2);   // spec-const
     ivec2[2](ivec2(sci2, sci2), ivec2(sci2, sci2)); // not a spec-const
 
-    vec2(scf1, scf1);   // not spec-const
+    vec2(scf1, scf1);   // spec-const
     vec2[2](vec2(scf1, scf1), vec2(scf1, scf1)); // not a spec-const
 }

glslang/MachineIndependent/ParseHelper.cpp

@@ -3115,6 +3115,7 @@ bool TParseContext::constructorError(const TSourceLoc& loc, TIntermNode* node, T
     bool matrixInMatrix = false;
     bool arrayArg = false;
     bool floatArgument = false;
+    bool intArgument = false;
     for (int arg = 0; arg < function.getParamCount(); ++arg) {
         if (function[arg].type->isArray()) {
             if (function[arg].type->isUnsizedArray()) {
@@ -3145,6 +3146,8 @@ bool TParseContext::constructorError(const TSourceLoc& loc, TIntermNode* node, T
             specConstType = true;
         if (function[arg].type->isFloatingDomain())
             floatArgument = true;
+        if (function[arg].type->isIntegerDomain())
+            intArgument = true;
         if (type.isStruct()) {
             if (function[arg].type->contains16BitFloat()) {
                 requireFloat16Arithmetic(loc, "constructor", "can't construct structure containing 16-bit type");
@@ -3250,6 +3253,15 @@ bool TParseContext::constructorError(const TSourceLoc& loc, TIntermNode* node, T
                 // and aren't making an array.
                 makeSpecConst = ! floatArgument && ! type.isArray();
                 break;
+
+            case EOpConstructVec2:
+            case EOpConstructVec3:
+            case EOpConstructVec4:
+                // This was the list of valid ones, if they aren't converting from int
+                // and aren't making an array.
+                makeSpecConst = ! intArgument && !type.isArray();
+                break;
+
             default:
                 // anything else wasn't white-listed in the spec as a conversion
                 makeSpecConst = false;