1 files changed, 112 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/compiler/translator/AtomicCounterFunctionHLSL.cpp b/gfx/angle/checkout/src/compiler/translator/AtomicCounterFunctionHLSL.cpp
new file mode 100644
index 0000000000..b900bc4d81
--- /dev/null
+++ b/gfx/angle/checkout/src/compiler/translator/AtomicCounterFunctionHLSL.cpp
@@ -0,0 +1,112 @@
+//
+// Copyright 2018 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.
+//
+// AtomicCounterFunctionHLSL: Class for writing implementation of atomic counter functions into HLSL
+// output.
+//
+
+#include "compiler/translator/AtomicCounterFunctionHLSL.h"
+
+#include "compiler/translator/Common.h"
+#include "compiler/translator/ImmutableStringBuilder.h"
+#include "compiler/translator/InfoSink.h"
+#include "compiler/translator/IntermNode.h"
+
+namespace sh
+{
+
+namespace
+{
+constexpr ImmutableString kAtomicCounter("atomicCounter");
+constexpr ImmutableString kAtomicCounterIncrement("atomicCounterIncrement");
+constexpr ImmutableString kAtomicCounterDecrement("atomicCounterDecrement");
+constexpr ImmutableString kAtomicCounterBaseName("_acbase_");
+}  // namespace
+
+AtomicCounterFunctionHLSL::AtomicCounterFunctionHLSL(bool forceResolution)
+    : mForceResolution(forceResolution)
+{}
+
+ImmutableString AtomicCounterFunctionHLSL::useAtomicCounterFunction(const ImmutableString &name)
+{
+    // The largest string that will be create created is "_acbase_increment" or "_acbase_decrement"
+    ImmutableStringBuilder hlslFunctionNameSB(kAtomicCounterBaseName.length() +
+                                              strlen("increment"));
+    hlslFunctionNameSB << kAtomicCounterBaseName;
+
+    AtomicCounterFunction atomicMethod;
+    if (kAtomicCounter == name)
+    {
+        atomicMethod = AtomicCounterFunction::LOAD;
+        hlslFunctionNameSB << "load";
+    }
+    else if (kAtomicCounterIncrement == name)
+    {
+        atomicMethod = AtomicCounterFunction::INCREMENT;
+        hlslFunctionNameSB << "increment";
+    }
+    else if (kAtomicCounterDecrement == name)
+    {
+        atomicMethod = AtomicCounterFunction::DECREMENT;
+        hlslFunctionNameSB << "decrement";
+    }
+    else
+    {
+        atomicMethod = AtomicCounterFunction::INVALID;
+        UNREACHABLE();
+    }
+
+    ImmutableString hlslFunctionName(hlslFunctionNameSB);
+    mAtomicCounterFunctions[hlslFunctionName] = atomicMethod;
+
+    return hlslFunctionName;
+}
+
+void AtomicCounterFunctionHLSL::atomicCounterFunctionHeader(TInfoSinkBase &out)
+{
+    for (auto &atomicFunction : mAtomicCounterFunctions)
+    {
+        out << "uint " << atomicFunction.first
+            << "(in RWByteAddressBuffer counter, int address)\n"
+               "{\n"
+               "    uint ret;\n";
+
+        switch (atomicFunction.second)
+        {
+            case AtomicCounterFunction::INCREMENT:
+                out << "    counter.InterlockedAdd(address, 1u, ret);\n";
+                break;
+            case AtomicCounterFunction::DECREMENT:
+                out << "    counter.InterlockedAdd(address, 0u - 1u, ret);\n"
+                       "    ret -= 1u;\n";  // atomicCounterDecrement is a post-decrement op
+                break;
+            case AtomicCounterFunction::LOAD:
+                out << "    ret = counter.Load(address);\n";
+                break;
+            default:
+                UNREACHABLE();
+                break;
+        }
+
+        if (mForceResolution && atomicFunction.second != AtomicCounterFunction::LOAD)
+        {
+            out << "    if (ret == 0) {\n"
+                   "        ret = 0 - ret;\n"
+                   "    }\n";
+        }
+
+        out << "    return ret;\n"
+               "}\n\n";
+    }
+}
+
+ImmutableString getAtomicCounterNameForBinding(int binding)
+{
+    std::stringstream counterName = sh::InitializeStream<std::stringstream>();
+    counterName << kAtomicCounterBaseName << binding;
+    return ImmutableString(counterName.str());
+}
+
+}  // namespace sh