Add a test for buffer auto-binding assignment.

Test/baseResults/spv.buffer.autoassign.frag.out

+spv.buffer.autoassign.frag
+
+Linked fragment stage:
+
+
+// Module Version 10000
+// Generated by (magic number): 80001
+// Id's are bound by 45
+
+                              Capability Shader
+               1:             ExtInstImport  "GLSL.std.450"
+                              MemoryModel Logical GLSL450
+                              EntryPoint Fragment 4  "main" 41
+                              ExecutionMode 4 OriginUpperLeft
+                              Name 4  "main"
+                              Name 8  "PS_OUTPUT"
+                              MemberName 8(PS_OUTPUT) 0  "Color"
+                              Name 10  "psout"
+                              Name 13  ""
+                              MemberName 13 0  "g_a"
+                              MemberName 13 1  "g_b"
+                              Name 15  ""
+                              Name 25  ""
+                              MemberName 25 0  "g_c"
+                              Name 27  ""
+                              Name 31  ""
+                              MemberName 31 0  "g_d"
+                              Name 33  ""
+                              Name 41  "Color"
+                              MemberDecorate 13 0 Offset 0
+                              MemberDecorate 13 1 Offset 4
+                              Decorate 13 Block
+                              Decorate 15 DescriptorSet 0
+                              Decorate 15 Binding 20
+                              MemberDecorate 25 0 Offset 0
+                              Decorate 25 Block
+                              Decorate 27 DescriptorSet 0
+                              Decorate 27 Binding 1
+                              MemberDecorate 31 0 Offset 0
+                              Decorate 31 Block
+                              Decorate 33 DescriptorSet 0
+                              Decorate 33 Binding 2
+                              Decorate 41(Color) Location 0
+               2:             TypeVoid
+               3:             TypeFunction 2
+               6:             TypeFloat 32
+               7:             TypeVector 6(float) 4
+    8(PS_OUTPUT):             TypeStruct 7(fvec4)
+               9:             TypePointer Function 8(PS_OUTPUT)
+              11:             TypeInt 32 1
+              12:     11(int) Constant 0
+              13:             TypeStruct 6(float) 11(int)
+              14:             TypePointer Uniform 13(struct)
+              15:     14(ptr) Variable Uniform
+              16:             TypePointer Uniform 6(float)
+              19:     11(int) Constant 1
+              20:             TypePointer Uniform 11(int)
+              25:             TypeStruct 6(float)
+              26:             TypePointer Uniform 25(struct)
+              27:     26(ptr) Variable Uniform
+              31:             TypeStruct 6(float)
+              32:             TypePointer Uniform 31(struct)
+              33:     32(ptr) Variable Uniform
+              38:             TypePointer Function 7(fvec4)
+              40:             TypePointer Output 7(fvec4)
+       41(Color):     40(ptr) Variable Output
+         4(main):           2 Function None 3
+               5:             Label
+       10(psout):      9(ptr) Variable Function
+              17:     16(ptr) AccessChain 15 12
+              18:    6(float) Load 17
+              21:     20(ptr) AccessChain 15 19
+              22:     11(int) Load 21
+              23:    6(float) ConvertSToF 22
+              24:    6(float) FAdd 18 23
+              28:     16(ptr) AccessChain 27 12
+              29:    6(float) Load 28
+              30:    6(float) FAdd 24 29
+              34:     16(ptr) AccessChain 33 12
+              35:    6(float) Load 34
+              36:    6(float) FAdd 30 35
+              37:    7(fvec4) CompositeConstruct 36 36 36 36
+              39:     38(ptr) AccessChain 10(psout) 12
+                              Store 39 37
+              42:     38(ptr) AccessChain 10(psout) 12
+              43:    7(fvec4) Load 42
+                              Store 41(Color) 43
+                              Return
+                              FunctionEnd

Test/spv.buffer.autoassign.frag

+
+cbuffer MyUB1 : register(b5)  // explicitly assigned & offsetted
+{
+    float g_a;
+    int g_b;
+};
+
+cbuffer MyUB2  // implicitly assigned
+{
+    float g_c;
+};
+
+cbuffer MyUB3  // implicitly assigned
+{
+    float g_d;
+};
+
+struct PS_OUTPUT
+{
+    float4 Color : SV_Target0;
+};
+
+PS_OUTPUT main()
+{
+    PS_OUTPUT psout;
+    psout.Color = g_a + g_b + g_c + g_d;
+    return psout;
+}

gtests/Spv.FromFile.cpp

@@ -284,6 +284,7 @@ INSTANTIATE_TEST_CASE_P(
         { "spv.register.autoassign.frag", "main_ep", 5, 10, 15, true, false },
         { "spv.register.noautoassign.frag", "main_ep", 5, 10, 15, false, false },
         { "spv.register.autoassign-2.frag", "main", 5, 10, 15, true, true },
+        { "spv.buffer.autoassign.frag", "main", 5, 10, 15, true, true },
     }),
     FileNameAsCustomTestSuffixIoMap
 );