Translator: Fix local var inits vs struct/uniform separation

src/compiler/translator/tree_ops/vulkan/SeparateStructFromUniformDeclarations.cpp

@@ -31,7 +31,7 @@ class Traverser : public TIntermTraverser
 
         if (!mInGlobalScope)
         {
-            return false;
+            return true;
         }
 
         const TIntermSequence &sequence = *(decl->getSequence());
@@ -61,10 +61,10 @@ class Traverser : public TIntermTraverser
                        TIntermTyped *declarator,
                        const TStructure *oldStructure)
     {
-        // struct <structName> { ... };
         const TStructure *structure = oldStructure;
         if (oldStructure->symbolType() == SymbolType::Empty)
         {
+            // Handle nameless structs: uniform struct { ... } variable;
             structure = new TStructure(mSymbolTable, kEmptyImmutableString, &oldStructure->fields(),
                                        SymbolType::AngleInternal);
         }
@@ -80,10 +80,10 @@ class Traverser : public TIntermTraverser
         TIntermSequence newSequence;
         newSequence.push_back(structDeclaration);
 
-        // uniform <structName> <structUniformName>;
+        // Redeclare the uniform with the (potentially) new struct type
         TIntermSymbol *asSymbol = declarator->getAsSymbolNode();
-        if (asSymbol && asSymbol->variable().symbolType() != SymbolType::Empty)
-        {
+        ASSERT(asSymbol && asSymbol->variable().symbolType() != SymbolType::Empty);
+
         TIntermDeclaration *namedDecl = new TIntermDeclaration;
         TType *uniformType            = new TType(structure, false);
         uniformType->setQualifier(EvqUniform);
@@ -95,8 +95,7 @@ class Traverser : public TIntermTraverser
 
         newSequence.push_back(namedDecl);
 
-            mVariableMap[&asSymbol->variable()] = new TIntermSymbol(newVar);
-        }
+        mVariableMap[&asSymbol->variable()] = newSymbol;
 
         mMultiReplacements.emplace_back(getParentNode()->getAsBlock(), decl,
                                         std::move(newSequence));

src/tests/gl_tests/GLSLTest.cpp

@@ -10686,6 +10686,37 @@ void main()
     GLuint program = CompileProgram(kVS, kFS);
     EXPECT_EQ(0u, program);
 }
+
+// Regression test for transformation bug which separates struct declarations from uniform
+// declarations.  The bug was that the uniform variable usage in the initializer of a new
+// declaration (y below) was not being processed.
+TEST_P(GLSLTest, UniformStructBug)
+{
+    constexpr char kVS[] = R"(precision highp float;
+
+uniform struct Global
+{
+    float x;
+} u_global;
+
+void main() {
+  float y = u_global.x;
+
+  gl_Position = vec4(y);
+})";
+
+    GLuint shader = glCreateShader(GL_VERTEX_SHADER);
+
+    const char *sourceArray[1] = {kVS};
+    GLint lengths[1]           = {static_cast<GLint>(sizeof(kVS) - 1)};
+    glShaderSource(shader, 1, sourceArray, lengths);
+    glCompileShader(shader);
+
+    GLint compileResult;
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &compileResult);
+    EXPECT_NE(compileResult, 0);
+}
+
 }  // anonymous namespace
 
 ANGLE_INSTANTIATE_TEST_ES2_AND_ES3(GLSLTest);