1 files changed, 163 insertions, 0 deletions
diff --git a/gfx/angle/src/compiler/translator/UseInterfaceBlockFields.cpp b/gfx/angle/src/compiler/translator/UseInterfaceBlockFields.cpp
new file mode 100644
index 000000000..390e2b092
--- /dev/null
+++ b/gfx/angle/src/compiler/translator/UseInterfaceBlockFields.cpp
@@ -0,0 +1,163 @@
+//
+// Copyright 2016 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// UseInterfaceBlockFields.cpp: insert statements to reference all members in InterfaceBlock list at
+// the beginning of main. This is to work around a Mac driver that treats unused standard/shared
+// uniform blocks as inactive.
+
+#include "compiler/translator/UseInterfaceBlockFields.h"
+
+#include "compiler/translator/IntermNode.h"
+#include "compiler/translator/SymbolTable.h"
+#include "compiler/translator/util.h"
+
+namespace sh
+{
+
+namespace
+{
+
+class UseUniformBlockMembers : public TIntermTraverser
+{
+  public:
+    UseUniformBlockMembers(const InterfaceBlockList &blocks, const TSymbolTable &symbolTable)
+        : TIntermTraverser(true, false, false),
+          mBlocks(blocks),
+          mSymbolTable(symbolTable),
+          mCodeInserted(false)
+    {
+        ASSERT(mSymbolTable.atGlobalLevel());
+    }
+
+  protected:
+    bool visitAggregate(Visit visit, TIntermAggregate *node) override { return !mCodeInserted; }
+    bool visitFunctionDefinition(Visit visit, TIntermFunctionDefinition *node) override;
+
+  private:
+    void insertUseCode(TIntermSequence *sequence);
+    void AddFieldUseStatements(const ShaderVariable &var, TIntermSequence *sequence);
+
+    const InterfaceBlockList &mBlocks;
+    const TSymbolTable &mSymbolTable;
+    bool mCodeInserted;
+};
+
+bool UseUniformBlockMembers::visitFunctionDefinition(Visit visit, TIntermFunctionDefinition *node)
+{
+    ASSERT(visit == PreVisit);
+    if (node->getFunctionSymbolInfo()->isMain())
+    {
+        TIntermBlock *body = node->getBody();
+        ASSERT(body);
+        insertUseCode(body->getSequence());
+        mCodeInserted = true;
+        return false;
+    }
+    return !mCodeInserted;
+}
+
+void UseUniformBlockMembers::AddFieldUseStatements(const ShaderVariable &var,
+                                                   TIntermSequence *sequence)
+{
+    TString name = TString(var.name.c_str());
+    if (var.isArray())
+    {
+        size_t pos = name.find_last_of('[');
+        if (pos != TString::npos)
+        {
+            name = name.substr(0, pos);
+        }
+    }
+    const TType *type;
+    TType basicType;
+    if (var.isStruct())
+    {
+        TVariable *structInfo = reinterpret_cast<TVariable *>(mSymbolTable.findGlobal(name));
+        ASSERT(structInfo);
+        const TType &structType = structInfo->getType();
+        type                    = &structType;
+    }
+    else
+    {
+        basicType = sh::GetShaderVariableBasicType(var);
+        type      = &basicType;
+    }
+    ASSERT(type);
+
+    TIntermSymbol *symbol = new TIntermSymbol(0, name, *type);
+    if (var.isArray())
+    {
+        for (unsigned int i = 0; i < var.arraySize; ++i)
+        {
+            TIntermBinary *element =
+                new TIntermBinary(EOpIndexDirect, symbol, TIntermTyped::CreateIndexNode(i));
+            sequence->insert(sequence->begin(), element);
+        }
+    }
+    else
+    {
+        sequence->insert(sequence->begin(), symbol);
+    }
+}
+
+void UseUniformBlockMembers::insertUseCode(TIntermSequence *sequence)
+{
+    for (const auto &block : mBlocks)
+    {
+        if (block.instanceName.empty())
+        {
+            for (const auto &var : block.fields)
+            {
+                AddFieldUseStatements(var, sequence);
+            }
+        }
+        else if (block.arraySize > 0)
+        {
+            TString name      = TString(block.instanceName.c_str());
+            TVariable *ubInfo = reinterpret_cast<TVariable *>(mSymbolTable.findGlobal(name));
+            ASSERT(ubInfo);
+            TIntermSymbol *arraySymbol = new TIntermSymbol(0, name, ubInfo->getType());
+            for (unsigned int i = 0; i < block.arraySize; ++i)
+            {
+                TIntermBinary *instanceSymbol = new TIntermBinary(EOpIndexDirect, arraySymbol,
+                                                                  TIntermTyped::CreateIndexNode(i));
+                for (unsigned int j = 0; j < block.fields.size(); ++j)
+                {
+                    TIntermBinary *element =
+                        new TIntermBinary(EOpIndexDirectInterfaceBlock, instanceSymbol,
+                                          TIntermTyped::CreateIndexNode(j));
+                    sequence->insert(sequence->begin(), element);
+                }
+            }
+        }
+        else
+        {
+            TString name      = TString(block.instanceName.c_str());
+            TVariable *ubInfo = reinterpret_cast<TVariable *>(mSymbolTable.findGlobal(name));
+            ASSERT(ubInfo);
+            TIntermSymbol *blockSymbol = new TIntermSymbol(0, name, ubInfo->getType());
+            for (unsigned int i = 0; i < block.fields.size(); ++i)
+            {
+                TIntermBinary *element = new TIntermBinary(
+                    EOpIndexDirectInterfaceBlock, blockSymbol, TIntermTyped::CreateIndexNode(i));
+
+                sequence->insert(sequence->begin(), element);
+            }
+        }
+    }
+}
+
+}  // namespace anonymous
+
+void UseInterfaceBlockFields(TIntermNode *root,
+                             const InterfaceBlockList &blocks,
+                             const TSymbolTable &symbolTable)
+{
+    UseUniformBlockMembers useUniformBlock(blocks, symbolTable);
+    root->traverse(&useUniformBlock);
+}
+
+}  // namespace sh