1 files changed, 104 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/compiler/translator/ExtensionGLSL.cpp b/gfx/angle/checkout/src/compiler/translator/ExtensionGLSL.cpp
new file mode 100644
index 0000000000..e3fef952fb
--- /dev/null
+++ b/gfx/angle/checkout/src/compiler/translator/ExtensionGLSL.cpp
@@ -0,0 +1,104 @@
+//
+// Copyright 2015 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.
+//
+// ExtensionGLSL.cpp: Implements the TExtensionGLSL class that tracks GLSL extension requirements
+// of shaders.
+
+#include "compiler/translator/ExtensionGLSL.h"
+
+#include "compiler/translator/VersionGLSL.h"
+
+namespace sh
+{
+
+TExtensionGLSL::TExtensionGLSL(ShShaderOutput output)
+    : TIntermTraverser(true, false, false), mTargetVersion(ShaderOutputTypeToGLSLVersion(output))
+{}
+
+const std::set<std::string> &TExtensionGLSL::getEnabledExtensions() const
+{
+    return mEnabledExtensions;
+}
+
+const std::set<std::string> &TExtensionGLSL::getRequiredExtensions() const
+{
+    return mRequiredExtensions;
+}
+
+bool TExtensionGLSL::visitUnary(Visit, TIntermUnary *node)
+{
+    checkOperator(node);
+
+    return true;
+}
+
+bool TExtensionGLSL::visitAggregate(Visit, TIntermAggregate *node)
+{
+    checkOperator(node);
+
+    return true;
+}
+
+void TExtensionGLSL::checkOperator(TIntermOperator *node)
+{
+    if (mTargetVersion < GLSL_VERSION_130)
+    {
+        return;
+    }
+
+    switch (node->getOp())
+    {
+        case EOpAbs:
+            break;
+
+        case EOpSign:
+            break;
+
+        case EOpMix:
+            break;
+
+        case EOpFloatBitsToInt:
+        case EOpFloatBitsToUint:
+        case EOpIntBitsToFloat:
+        case EOpUintBitsToFloat:
+            if (mTargetVersion < GLSL_VERSION_330)
+            {
+                // Bit conversion functions cannot be emulated.
+                mRequiredExtensions.insert("GL_ARB_shader_bit_encoding");
+            }
+            break;
+
+        case EOpPackSnorm2x16:
+        case EOpPackHalf2x16:
+        case EOpUnpackSnorm2x16:
+        case EOpUnpackHalf2x16:
+            if (mTargetVersion < GLSL_VERSION_420)
+            {
+                mEnabledExtensions.insert("GL_ARB_shading_language_packing");
+
+                if (mTargetVersion < GLSL_VERSION_330)
+                {
+                    // floatBitsToUint and uintBitsToFloat are needed to emulate
+                    // packHalf2x16 and unpackHalf2x16 respectively and cannot be
+                    // emulated themselves.
+                    mRequiredExtensions.insert("GL_ARB_shader_bit_encoding");
+                }
+            }
+            break;
+
+        case EOpPackUnorm2x16:
+        case EOpUnpackUnorm2x16:
+            if (mTargetVersion < GLSL_VERSION_410)
+            {
+                mEnabledExtensions.insert("GL_ARB_shading_language_packing");
+            }
+            break;
+
+        default:
+            break;
+    }
+}
+
+}  // namespace sh