SPV: Further refine OpenGL vs. Vulkan differences for SPIR-V.

Includes adding test cases to verify the differences.

23 files changed, 305 insertions, 27 deletions

diff --git a/SPIRV/GlslangToSpv.cpp b/SPIRV/GlslangToSpv.cpp
index e9495475..04c4017b 100755
--- a/SPIRV/GlslangToSpv.cpp
+++ b/SPIRV/GlslangToSpv.cpp
@@ -4078,6 +4078,9 @@ spv::Id TGlslangToSpvTraverser::getSymbolId(const glslang::TIntermSymbol* symbol
             if (symbol->getQualifier().hasXfbOffset())
                 builder.addDecoration(id, spv::DecorationOffset, symbol->getQualifier().layoutXfbOffset);
         }
+        // atomic counters use this:
+        if (symbol->getQualifier().hasOffset())
+            builder.addDecoration(id, spv::DecorationOffset, symbol->getQualifier().layoutOffset);
     }
 
     if (symbol->getQualifier().hasLocation())
diff --git a/StandAlone/StandAlone.cpp b/StandAlone/StandAlone.cpp
index 3fd7e7d2..0e4e7382 100644
--- a/StandAlone/StandAlone.cpp
+++ b/StandAlone/StandAlone.cpp
@@ -222,7 +222,13 @@ void ProcessArguments(int argc, char* argv[])
             switch (argv[0][1]) {
             case 'H':
                 Options |= EOptionHumanReadableSpv;
-                // fall through to -V
+                if ((Options & EOptionSpv) == 0) {
+                    // default to Vulkan
+                    Options |= EOptionSpv;
+                    Options |= EOptionVulkanRules;
+                    Options |= EOptionLinkProgram;
+                }
+                break;
             case 'V':
                 Options |= EOptionSpv;
                 Options |= EOptionVulkanRules;
@@ -231,6 +237,8 @@ void ProcessArguments(int argc, char* argv[])
             case 'G':
                 Options |= EOptionSpv;
                 Options |= EOptionLinkProgram;
+                // undo a -H default to Vulkan
+                Options &= ~EOptionVulkanRules;
                 break;
             case 'E':
                 Options |= EOptionOutputPreprocessed;
diff --git a/Test/baseResults/glspv.esversion.vert.out b/Test/baseResults/glspv.esversion.vert.out
new file mode 100755
index 00000000..ef406a18
--- /dev/null
+++ b/Test/baseResults/glspv.esversion.vert.out
@@ -0,0 +1,11 @@
+glspv.esversion.vert
+ERROR: #version: ES shaders for OpenGL SPIR-V are not supported
+Warning, version 310 is not yet complete; most version-specific features are present, but some are missing.
+ERROR: 1 compilation errors.  No code generated.
+
+
+
+Linked vertex stage:
+
+
+SPIR-V is not generated for failed compile or link
diff --git a/Test/baseResults/glspv.frag.out b/Test/baseResults/glspv.frag.out
new file mode 100755
index 00000000..5df46c5b
--- /dev/null
+++ b/Test/baseResults/glspv.frag.out
@@ -0,0 +1,13 @@
+glspv.frag
+ERROR: 0:4: '#error' : GL_SPIRV is set ( correct , not an error )  
+ERROR: 0:6: '#error' : GL_SPIR is 100  
+ERROR: 0:14: 'input_attachment_index' : only allowed when using GLSL for Vulkan 
+ERROR: 0:14: '' :  syntax error
+ERROR: 4 compilation errors.  No code generated.
+
+
+
+Linked fragment stage:
+
+
+SPIR-V is not generated for failed compile or link
diff --git a/Test/baseResults/glspv.version.frag.out b/Test/baseResults/glspv.version.frag.out
new file mode 100755
index 00000000..7f44889f
--- /dev/null
+++ b/Test/baseResults/glspv.version.frag.out
@@ -0,0 +1,24 @@
+glspv.version.frag
+ERROR: #version: compilation for SPIR-V does not support the compatibility profile
+
+
+Linked fragment stage:
+
+
+// Module Version 10000
+// Generated by (magic number): 80001
+// Id's are bound by 6
+
+                              Capability Shader
+               1:             ExtInstImport  "GLSL.std.450"
+                              MemoryModel Logical GLSL450
+                              EntryPoint Fragment 4  "main"
+                              ExecutionMode 4 OriginLowerLeft
+                              Source GLSL 330
+                              Name 4  "main"
+               2:             TypeVoid
+               3:             TypeFunction 2
+         4(main):           2 Function None 3
+               5:             Label
+                              Return
+                              FunctionEnd
diff --git a/Test/baseResults/glspv.version.vert.out b/Test/baseResults/glspv.version.vert.out
new file mode 100755
index 00000000..eb003dff
--- /dev/null
+++ b/Test/baseResults/glspv.version.vert.out
@@ -0,0 +1,10 @@
+glspv.version.vert
+ERROR: #version: Desktop shaders for OpenGL SPIR-V require version 330 or higher
+ERROR: 1 compilation errors.  No code generated.
+
+
+
+Linked vertex stage:
+
+
+SPIR-V is not generated for failed compile or link
diff --git a/Test/baseResults/glspv.vert.out b/Test/baseResults/glspv.vert.out
new file mode 100755
index 00000000..b91ab507
--- /dev/null
+++ b/Test/baseResults/glspv.vert.out
@@ -0,0 +1,18 @@
+glspv.vert
+Warning, version 450 is not yet complete; most version-specific features are present, but some are missing.
+ERROR: 0:3: 'push_constant' : only allowed when using GLSL for Vulkan 
+ERROR: 0:6: 'descriptor set' : only allowed when using GLSL for Vulkan 
+ERROR: 0:8: 'shared' : not allowed when generating SPIR-V 
+ERROR: 0:9: 'packed' : not allowed when generating SPIR-V 
+ERROR: 0:13: 'gl_VertexIndex' : undeclared identifier 
+ERROR: 0:14: 'gl_InstanceIndex' : undeclared identifier 
+ERROR: 0:17: 'gl_DepthRangeParameters' : undeclared identifier 
+ERROR: 0:20: '' :  syntax error
+ERROR: 8 compilation errors.  No code generated.
+
+
+
+Linked vertex stage:
+
+
+SPIR-V is not generated for failed compile or link
diff --git a/Test/baseResults/spv.atomic.comp.out b/Test/baseResults/spv.atomic.comp.out
index e4cf2320..01e09323 100755
--- a/Test/baseResults/spv.atomic.comp.out
+++ b/Test/baseResults/spv.atomic.comp.out
@@ -35,7 +35,9 @@ Linked compute stage:
                               Name 70  "arrX"
                               Name 71  "arrY"
                               Name 72  "arrZ"
+                              Decorate 20(counter) Offset 0
                               Decorate 20(counter) Binding 0
+                              Decorate 27(countArr) Offset 4
                               Decorate 27(countArr) Binding 0
                               MemberDecorate 60(dataSSB) 0 Restrict
                               MemberDecorate 60(dataSSB) 0 Offset 0
diff --git a/Test/baseResults/spv.glFragColor.frag.out b/Test/baseResults/spv.glFragColor.frag.out
new file mode 100755
index 00000000..df825a09
--- /dev/null
+++ b/Test/baseResults/spv.glFragColor.frag.out
@@ -0,0 +1,30 @@
+spv.glFragColor.frag
+
+Linked fragment stage:
+
+
+// Module Version 10000
+// Generated by (magic number): 80001
+// Id's are bound by 12
+
+                              Capability Shader
+               1:             ExtInstImport  "GLSL.std.450"
+                              MemoryModel Logical GLSL450
+                              EntryPoint Fragment 4  "main" 9
+                              ExecutionMode 4 OriginLowerLeft
+                              Source GLSL 330
+                              Name 4  "main"
+                              Name 9  "gl_FragColor"
+               2:             TypeVoid
+               3:             TypeFunction 2
+               6:             TypeFloat 32
+               7:             TypeVector 6(float) 4
+               8:             TypePointer Output 7(fvec4)
+ 9(gl_FragColor):      8(ptr) Variable Output
+              10:    6(float) Constant 1065353216
+              11:    7(fvec4) ConstantComposite 10 10 10 10
+         4(main):           2 Function None 3
+               5:             Label
+                              Store 9(gl_FragColor) 11
+                              Return
+                              FunctionEnd
diff --git a/Test/baseResults/spv.specConst.vert.out b/Test/baseResults/spv.specConst.vert.out
new file mode 100755
index 00000000..db5a417c
--- /dev/null
+++ b/Test/baseResults/spv.specConst.vert.out
@@ -0,0 +1,61 @@
+spv.specConst.vert
+Warning, version 450 is not yet complete; most version-specific features are present, but some are missing.
+
+
+Linked vertex stage:
+
+
+// Module Version 10000
+// Generated by (magic number): 80001
+// Id's are bound by 27
+
+                              Capability Shader
+               1:             ExtInstImport  "GLSL.std.450"
+                              MemoryModel Logical GLSL450
+                              EntryPoint Vertex 4  "main" 13 25 26
+                              Source GLSL 450
+                              Name 4  "main"
+                              Name 11  "gl_PerVertex"
+                              MemberName 11(gl_PerVertex) 0  "gl_Position"
+                              MemberName 11(gl_PerVertex) 1  "gl_PointSize"
+                              MemberName 11(gl_PerVertex) 2  "gl_ClipDistance"
+                              MemberName 11(gl_PerVertex) 3  "gl_CullDistance"
+                              Name 13  ""
+                              Name 25  "gl_VertexID"
+                              Name 26  "gl_InstanceID"
+                              MemberDecorate 11(gl_PerVertex) 0 BuiltIn Position
+                              MemberDecorate 11(gl_PerVertex) 1 BuiltIn PointSize
+                              MemberDecorate 11(gl_PerVertex) 2 BuiltIn ClipDistance
+                              MemberDecorate 11(gl_PerVertex) 3 BuiltIn CullDistance
+                              Decorate 11(gl_PerVertex) Block
+                              Decorate 18 SpecId 11
+                              Decorate 25(gl_VertexID) BuiltIn VertexId
+                              Decorate 26(gl_InstanceID) BuiltIn InstanceId
+               2:             TypeVoid
+               3:             TypeFunction 2
+               6:             TypeFloat 32
+               7:             TypeVector 6(float) 4
+               8:             TypeInt 32 0
+               9:      8(int) Constant 1
+              10:             TypeArray 6(float) 9
+11(gl_PerVertex):             TypeStruct 7(fvec4) 6(float) 10 10
+              12:             TypePointer Output 11(gl_PerVertex)
+              13:     12(ptr) Variable Output
+              14:             TypeInt 32 1
+              15:     14(int) Constant 0
+              16:    6(float) Constant 1065353216
+              17:    7(fvec4) ConstantComposite 16 16 16 16
+              18:     14(int) SpecConstant 8
+              22:             TypePointer Output 7(fvec4)
+              24:             TypePointer Input 14(int)
+ 25(gl_VertexID):     24(ptr) Variable Input
+26(gl_InstanceID):     24(ptr) Variable Input
+         4(main):           2 Function None 3
+               5:             Label
+              19:    6(float) ConvertSToF 18
+              20:    7(fvec4) CompositeConstruct 19 19 19 19
+              21:    7(fvec4) FDiv 17 20
+              23:     22(ptr) AccessChain 13 15
+                              Store 23 21
+                              Return
+                              FunctionEnd
diff --git a/Test/glspv.esversion.vert b/Test/glspv.esversion.vert
new file mode 100644
index 00000000..23501bf6
--- /dev/null
+++ b/Test/glspv.esversion.vert
@@ -0,0 +1,5 @@
+#version 310 es

+

+void main()

+{

+}

diff --git a/Test/glspv.frag b/Test/glspv.frag
new file mode 100644
index 00000000..cea8e135
--- /dev/null
+++ b/Test/glspv.frag
@@ -0,0 +1,14 @@
+#version 330

+

+#ifdef GL_SPIRV

+#error GL_SPIRV is set ( correct, not an error )

+#if GL_SPIRV == 100

+#error GL_SPIR is 100

+#endif

+#endif

+

+void main()

+{

+}

+

+layout(input_attachment_index = 1) uniform subpassInput sub; // ERROR, no inputs

diff --git a/Test/glspv.version.frag b/Test/glspv.version.frag
new file mode 100644
index 00000000..c9c6779e
--- /dev/null
+++ b/Test/glspv.version.frag
@@ -0,0 +1,5 @@
+#version 330 compatibility

+

+void main()

+{

+}

diff --git a/Test/glspv.version.vert b/Test/glspv.version.vert
new file mode 100644
index 00000000..c8573b7b
--- /dev/null
+++ b/Test/glspv.version.vert
@@ -0,0 +1,5 @@
+#version 150

+

+void main()

+{

+}

diff --git a/Test/glspv.vert b/Test/glspv.vert
new file mode 100644
index 00000000..d2724ca2
--- /dev/null
+++ b/Test/glspv.vert
@@ -0,0 +1,20 @@
+#version 450

+

+layout(push_constant) uniform Material { int a; } mat;            // ERROR, can't use push_constant

+

+layout(set = 0, binding = 0, std140) uniform Bt1 { int a; } bt1;

+layout(set = 1, binding = 0, std140) uniform Bt2 { int a; } bt2;  // ERROR, set has to be 0

+

+layout(shared) uniform Bt3 { int a; } bt3;                        // ERROR, no shared

+layout(packed) uniform Bt4 { int a; } bt4;                        // ERROR, no shared

+

+void main()

+{

+    gl_VertexIndex;   // ERROR, not preset

+    gl_InstanceIndex; // ERROR, not present

+    gl_VertexID;

+    gl_InstanceID;

+    gl_DepthRangeParameters; // ERROR, not present

+}

+

+uniform sampler s; // ERROR, no sampler

diff --git a/Test/spv.glFragColor.frag b/Test/spv.glFragColor.frag
new file mode 100644
index 00000000..12dbcb22
--- /dev/null
+++ b/Test/spv.glFragColor.frag
@@ -0,0 +1,6 @@
+#version 330

+

+void main()

+{

+    gl_FragColor = vec4(1.0);

+}

diff --git a/Test/spv.specConst.vert b/Test/spv.specConst.vert
new file mode 100644
index 00000000..3ea24980
--- /dev/null
+++ b/Test/spv.specConst.vert
@@ -0,0 +1,8 @@
+#version 450

+

+layout(constant_id = 11) const int a = 8;

+

+void main()

+{

+    gl_Position = vec4(1.0) / a;

+}

diff --git a/glslang/MachineIndependent/Initialize.cpp b/glslang/MachineIndependent/Initialize.cpp
index 2e016a85..871e7884 100644
--- a/glslang/MachineIndependent/Initialize.cpp
+++ b/glslang/MachineIndependent/Initialize.cpp
@@ -1985,17 +1985,14 @@ void TBuiltIns::initialize(int version, EProfile profile, const SpvVersion& spvV
                 "\n");
         }
         if (version >= 130 && spvVersion.vulkan == 0)
-            // gl_spirv TODO
             stageBuiltins[EShLangVertex].append(
                 "int gl_VertexID;"            // needs qualifier fixed later
                 );
         if (version >= 140 && spvVersion.vulkan == 0)
-            // gl_spirv TODO
             stageBuiltins[EShLangVertex].append(
                 "int gl_InstanceID;"          // needs qualifier fixed later
                 );
         if (spvVersion.vulkan >= 100 && version >= 140)
-            // gl_spirv TODO
             stageBuiltins[EShLangVertex].append(
                 "in int gl_VertexIndex;"
                 "in int gl_InstanceIndex;"
@@ -2016,13 +2013,11 @@ void TBuiltIns::initialize(int version, EProfile profile, const SpvVersion& spvV
                 );
         } else {
             if (spvVersion.vulkan == 0)
-                // gl_spirv TODO
                 stageBuiltins[EShLangVertex].append(
                     "in highp int gl_VertexID;"      // needs qualifier fixed later
                     "in highp int gl_InstanceID;"    // needs qualifier fixed later
                     );
             if (spvVersion.vulkan >= 100)
-                // gl_spirv TODO
                 stageBuiltins[EShLangVertex].append(
                     "in highp int gl_VertexIndex;"
                     "in highp int gl_InstanceIndex;"
@@ -3633,13 +3628,14 @@ void TBuiltIns::identifyBuiltIns(int version, EProfile profile, const SpvVersion
         }
 
         if (spvVersion.vulkan == 0) {
-            // gl_spirv TODO
             SpecialQualifier("gl_VertexID",   EvqVertexId,   EbvVertexId,   symbolTable);
             SpecialQualifier("gl_InstanceID", EvqInstanceId, EbvInstanceId, symbolTable);
         }
 
-        BuiltInVariable("gl_VertexIndex",   EbvVertexIndex,   symbolTable);
-        BuiltInVariable("gl_InstanceIndex", EbvInstanceIndex, symbolTable);
+        if (spvVersion.vulkan >= 100) {
+            BuiltInVariable("gl_VertexIndex",   EbvVertexIndex,   symbolTable);
+            BuiltInVariable("gl_InstanceIndex", EbvInstanceIndex, symbolTable);
+        }
 
         // Fall through
 
diff --git a/glslang/MachineIndependent/ParseHelper.cpp b/glslang/MachineIndependent/ParseHelper.cpp
index b01d773f..5dacc0e2 100644
--- a/glslang/MachineIndependent/ParseHelper.cpp
+++ b/glslang/MachineIndependent/ParseHelper.cpp
@@ -4109,7 +4109,10 @@ void TParseContext::setLayoutQualifier(const TSourceLoc& loc, TPublicType& publi
     std::transform(id.begin(), id.end(), id.begin(), ::tolower);
     
     if (id == "offset") {
-        const char* feature = "uniform offset";
+        // "offset" can be for either
+        //  - uniform offsets
+        //  - atomic_uint offsets
+        const char* feature = "offset";
         requireProfile(loc, EEsProfile | ECoreProfile | ECompatibilityProfile, feature);
         const char* exts[2] = { E_GL_ARB_enhanced_layouts, E_GL_ARB_shader_atomic_counters };
         profileRequires(loc, ECoreProfile | ECompatibilityProfile, 420, 2, exts, feature);
@@ -4140,6 +4143,8 @@ void TParseContext::setLayoutQualifier(const TSourceLoc& loc, TPublicType& publi
             error(loc, "set is too large", id.c_str(), "");
         else
             publicType.qualifier.layoutSet = value;
+        if (value != 0)
+            requireVulkan(loc, "descriptor set");
         return;
     } else if (id == "binding") {
         profileRequires(loc, ~EEsProfile, 420, E_GL_ARB_shading_language_420pack, "binding");
diff --git a/glslang/MachineIndependent/ShaderLang.cpp b/glslang/MachineIndependent/ShaderLang.cpp
index 226119e8..e386cf0d 100644
--- a/glslang/MachineIndependent/ShaderLang.cpp
+++ b/glslang/MachineIndependent/ShaderLang.cpp
@@ -468,7 +468,11 @@ bool DeduceVersionProfile(TInfoSink& infoSink, EShLanguage stage, bool versionNo
                 infoSink.info.message(EPrefixError, "#version: ES shaders for Vulkan SPIR-V require version 310 or higher");
                 version = 310;
             }
-            // gl_spirv TODO: test versions
+            if (spvVersion.openGl >= 100) {
+                correct = false;
+                infoSink.info.message(EPrefixError, "#version: ES shaders for OpenGL SPIR-V are not supported");
+                version = 310;
+            }
             break;
         case ECompatibilityProfile:
             infoSink.info.message(EPrefixError, "#version: compilation for SPIR-V does not support the compatibility profile");
@@ -479,7 +483,11 @@ bool DeduceVersionProfile(TInfoSink& infoSink, EShLanguage stage, bool versionNo
                 infoSink.info.message(EPrefixError, "#version: Desktop shaders for Vulkan SPIR-V require version 140 or higher");
                 version = 140;
             }
-            // gl_spirv TODO: test versions
+            if (spvVersion.openGl >= 100 && version < 330) {
+                correct = false;
+                infoSink.info.message(EPrefixError, "#version: Desktop shaders for OpenGL SPIR-V require version 330 or higher");
+                version = 330;
+            }
             break;
         }
     }
@@ -623,6 +631,10 @@ bool ProcessDeferred(
     if (messages & EShMsgSpvRules)
         spvVersion.spv = 0x00010000;    // TODO: eventually have this come from the outside
     EShSource source = (messages & EShMsgReadHlsl) ? EShSourceHlsl : EShSourceGlsl;
+    if (messages & EShMsgVulkanRules)
+        spvVersion.vulkan = 100;     // TODO: eventually have this come from the outside
+    else if (spvVersion.spv != 0)
+        spvVersion.openGl = 100;     // TODO: eventually have this come from the outside
     bool goodVersion = DeduceVersionProfile(compiler->infoSink, compiler->getLanguage(), versionNotFirst, defaultVersion, source, version, profile, spvVersion);
     bool versionWillBeError = (versionNotFound || (profile == EEsProfile && version >= 300 && versionNotFirst));
     bool warnVersionNotFirst = false;
@@ -633,10 +645,6 @@ bool ProcessDeferred(
             versionWillBeError = true;
     }
 
-    if (messages & EShMsgVulkanRules)
-        spvVersion.vulkan = 100;     // TODO: eventually have this come from the outside
-    else if (spvVersion.spv != 0)
-        spvVersion.openGl = 100;
     intermediate.setSource(source);
     intermediate.setVersion(version);
     intermediate.setProfile(profile);
diff --git a/glslang/MachineIndependent/Versions.cpp b/glslang/MachineIndependent/Versions.cpp
index 7d5a81e7..e46118af 100644
--- a/glslang/MachineIndependent/Versions.cpp
+++ b/glslang/MachineIndependent/Versions.cpp
@@ -176,7 +176,6 @@ void TParseVersions::initializeExtensionBehavior()
     extensionBehavior[E_GL_ARB_shader_texture_image_samples] = EBhDisable;
     extensionBehavior[E_GL_ARB_viewport_array]               = EBhDisable;
     extensionBehavior[E_GL_ARB_gpu_shader_int64]             = EBhDisable;
-    extensionBehavior[E_GL_ARB_gl_spirv]                     = EBhDisable;
     extensionBehavior[E_GL_ARB_shader_ballot]                = EBhDisable;
     extensionBehavior[E_GL_ARB_sparse_texture2]              = EBhDisable;
     extensionBehavior[E_GL_ARB_sparse_texture_clamp]         = EBhDisable;
@@ -282,7 +281,6 @@ void TParseVersions::getPreamble(std::string& preamble)
             "#define GL_ARB_shader_texture_image_samples 1\n"
             "#define GL_ARB_viewport_array 1\n"
             "#define GL_ARB_gpu_shader_int64 1\n"
-            "#define GL_ARB_gl_spirv 1\n"
             "#define GL_ARB_shader_ballot 1\n"
             "#define GL_ARB_sparse_texture2 1\n"
             "#define GL_ARB_sparse_texture_clamp 1\n"
@@ -298,14 +296,22 @@ void TParseVersions::getPreamble(std::string& preamble)
             ;
 
     // #define VULKAN XXXX
+    const int numberBufSize = 12;
+    char numberBuf[numberBufSize];
     if (spvVersion.vulkan > 0) {
         preamble += "#define VULKAN ";
-        char number[12];
-        snprintf(number, 12, "%d", spvVersion.vulkan);
-        preamble += number;
+        snprintf(numberBuf, numberBufSize, "%d", spvVersion.vulkan);
+        preamble += numberBuf;
         preamble += "\n";
     }
-    // gl_spirv TODO
+    // #define GL_SPIRV XXXX
+    if (spvVersion.openGl > 0) {
+        preamble += "#define GL_SPIRV ";
+        snprintf(numberBuf, numberBufSize, "%d", spvVersion.openGl);
+        preamble += numberBuf;
+        preamble += "\n";
+    }
+
 }
 
 //
diff --git a/glslang/MachineIndependent/Versions.h b/glslang/MachineIndependent/Versions.h
index 3a212a00..19d101db 100644
--- a/glslang/MachineIndependent/Versions.h
+++ b/glslang/MachineIndependent/Versions.h
@@ -79,7 +79,7 @@ struct SpvVersion {
     SpvVersion() : spv(0), vulkan(0), openGl(0) {}
     unsigned int spv; // the version of the targeted SPIR-V, as defined by SPIR-V in word 1 of the SPIR-V binary header
     int vulkan;       // the version of semantics for Vulkan; e.g., for GLSL from KHR_vulkan_glsl "#define VULKAN"
-    int openGl;       // the version of semantics for OpenGL; gl_spirv TODO
+    int openGl;       // the version of semantics for OpenGL; e.g., for GLSL from KHR_vulkan_glsl "#define GL_SPIRV"
 };
 
 //
@@ -124,7 +124,6 @@ const char* const E_GL_ARB_derivative_control           = "GL_ARB_derivative_con
 const char* const E_GL_ARB_shader_texture_image_samples = "GL_ARB_shader_texture_image_samples";
 const char* const E_GL_ARB_viewport_array               = "GL_ARB_viewport_array";
 const char* const E_GL_ARB_gpu_shader_int64             = "GL_ARB_gpu_shader_int64";
-const char* const E_GL_ARB_gl_spirv                     = "GL_ARB_gl_spirv";
 const char* const E_GL_ARB_shader_ballot                = "GL_ARB_shader_ballot";
 const char* const E_GL_ARB_sparse_texture2              = "GL_ARB_sparse_texture2";
 const char* const E_GL_ARB_sparse_texture_clamp         = "GL_ARB_sparse_texture_clamp";
diff --git a/gtests/Spv.FromFile.cpp b/gtests/Spv.FromFile.cpp
index 00f4a987..8296efde 100644
--- a/gtests/Spv.FromFile.cpp
+++ b/gtests/Spv.FromFile.cpp
@@ -44,6 +44,7 @@ namespace {
 using CompileVulkanToSpirvTest = GlslangTest<::testing::TestWithParam<std::string>>;
 using CompileOpenGLToSpirvTest = GlslangTest<::testing::TestWithParam<std::string>>;
 using VulkanSemantics = GlslangTest<::testing::TestWithParam<std::string>>;
+using OpenGLSemantics = GlslangTest<::testing::TestWithParam<std::string>>;
 using VulkanAstSemantics = GlslangTest<::testing::TestWithParam<std::string>>;
 
 // Compiling GLSL to SPIR-V under Vulkan semantics. Expected to successfully
@@ -73,6 +74,15 @@ TEST_P(VulkanSemantics, FromFile)
                             Target::Spv);
 }
 
+// GLSL-level Vulkan semantics test. Expected to error out before generating
+// SPIR-V.
+TEST_P(OpenGLSemantics, FromFile)
+{
+    loadFileCompileAndCheck(GLSLANG_TEST_DIRECTORY, GetParam(),
+                            Source::GLSL, Semantics::OpenGL,
+                            Target::Spv);
+}
+
 // GLSL-level Vulkan semantics test that need to see the AST for validation.
 TEST_P(VulkanAstSemantics, FromFile)
 {
@@ -206,10 +216,9 @@ INSTANTIATE_TEST_CASE_P(
 INSTANTIATE_TEST_CASE_P(
     Glsl, CompileOpenGLToSpirvTest,
     ::testing::ValuesIn(std::vector<std::string>({
-        // Test looping constructs.
-        // No tests yet for making sure break and continue from a nested loop
-        // goes to the innermost target.
         "spv.atomic.comp",
+        "spv.glFragColor.frag",
+        "spv.specConst.vert",
     })),
     FileNameAsCustomTestSuffix
 );
@@ -225,6 +234,18 @@ INSTANTIATE_TEST_CASE_P(
 );
 
 INSTANTIATE_TEST_CASE_P(
+    Glsl, OpenGLSemantics,
+    ::testing::ValuesIn(std::vector<std::string>({
+        "glspv.esversion.vert",
+        "glspv.version.frag",
+        "glspv.version.vert",
+        "glspv.frag",
+        "glspv.vert",
+    })),
+    FileNameAsCustomTestSuffix
+);
+
+INSTANTIATE_TEST_CASE_P(
     Glsl, VulkanAstSemantics,
     ::testing::ValuesIn(std::vector<std::string>({
         "vulkan.ast.vert",