1 files changed, 141 insertions, 0 deletions
diff --git a/gfx/angle/src/compiler/translator/VersionGLSL.cpp b/gfx/angle/src/compiler/translator/VersionGLSL.cpp
new file mode 100755
index 000000000..9e593ac76
--- /dev/null
+++ b/gfx/angle/src/compiler/translator/VersionGLSL.cpp
@@ -0,0 +1,141 @@
+//
+// Copyright (c) 2002-2012 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.
+//
+
+#include "compiler/translator/VersionGLSL.h"
+
+namespace sh
+{
+
+int ShaderOutputTypeToGLSLVersion(ShShaderOutput output)
+{
+    switch (output)
+    {
+      case SH_GLSL_130_OUTPUT:           return GLSL_VERSION_130;
+      case SH_GLSL_140_OUTPUT:           return GLSL_VERSION_140;
+      case SH_GLSL_150_CORE_OUTPUT:      return GLSL_VERSION_150;
+      case SH_GLSL_330_CORE_OUTPUT:      return GLSL_VERSION_330;
+      case SH_GLSL_400_CORE_OUTPUT:      return GLSL_VERSION_400;
+      case SH_GLSL_410_CORE_OUTPUT:      return GLSL_VERSION_410;
+      case SH_GLSL_420_CORE_OUTPUT:      return GLSL_VERSION_420;
+      case SH_GLSL_430_CORE_OUTPUT:      return GLSL_VERSION_430;
+      case SH_GLSL_440_CORE_OUTPUT:      return GLSL_VERSION_440;
+      case SH_GLSL_450_CORE_OUTPUT:      return GLSL_VERSION_450;
+      case SH_GLSL_COMPATIBILITY_OUTPUT: return GLSL_VERSION_110;
+      default: UNREACHABLE();            return 0;
+    }
+}
+
+// We need to scan for the following:
+// 1. "invariant" keyword: This can occur in both - vertex and fragment shaders
+//    but only at the global scope.
+// 2. "gl_PointCoord" built-in variable: This can only occur in fragment shader
+//    but inside any scope.
+// 3. Call to a matrix constructor with another matrix as argument.
+//    (These constructors were reserved in GLSL version 1.10.)
+// 4. Arrays as "out" function parameters.
+//    GLSL spec section 6.1.1: "When calling a function, expressions that do
+//    not evaluate to l-values cannot be passed to parameters declared as
+//    out or inout."
+//    GLSL 1.1 section 5.8: "Other binary or unary expressions,
+//    non-dereferenced arrays, function names, swizzles with repeated fields,
+//    and constants cannot be l-values."
+//    GLSL 1.2 relaxed the restriction on arrays, section 5.8: "Variables that
+//    are built-in types, entire structures or arrays... are all l-values."
+//
+TVersionGLSL::TVersionGLSL(sh::GLenum type,
+                           const TPragma &pragma,
+                           ShShaderOutput output)
+    : TIntermTraverser(true, false, false)
+{
+    mVersion = ShaderOutputTypeToGLSLVersion(output);
+    if (pragma.stdgl.invariantAll)
+    {
+        ensureVersionIsAtLeast(GLSL_VERSION_120);
+    }
+}
+
+void TVersionGLSL::visitSymbol(TIntermSymbol *node)
+{
+    if (node->getSymbol() == "gl_PointCoord")
+    {
+        ensureVersionIsAtLeast(GLSL_VERSION_120);
+    }
+}
+
+bool TVersionGLSL::visitDeclaration(Visit, TIntermDeclaration *node)
+{
+    const TIntermSequence &sequence = *(node->getSequence());
+    if (sequence.front()->getAsTyped()->getType().isInvariant())
+    {
+        ensureVersionIsAtLeast(GLSL_VERSION_120);
+    }
+    return true;
+}
+
+bool TVersionGLSL::visitAggregate(Visit, TIntermAggregate *node)
+{
+    bool visitChildren = true;
+
+    switch (node->getOp())
+    {
+      case EOpInvariantDeclaration:
+        ensureVersionIsAtLeast(GLSL_VERSION_120);
+        break;
+      case EOpParameters:
+        {
+            const TIntermSequence &params = *(node->getSequence());
+            for (TIntermSequence::const_iterator iter = params.begin();
+                 iter != params.end(); ++iter)
+            {
+                const TIntermTyped *param = (*iter)->getAsTyped();
+                if (param->isArray())
+                {
+                    TQualifier qualifier = param->getQualifier();
+                    if ((qualifier == EvqOut) || (qualifier ==  EvqInOut))
+                    {
+                        ensureVersionIsAtLeast(GLSL_VERSION_120);
+                        break;
+                    }
+                }
+            }
+            // Fully processed. No need to visit children.
+            visitChildren = false;
+            break;
+        }
+      case EOpConstructMat2:
+      case EOpConstructMat2x3:
+      case EOpConstructMat2x4:
+      case EOpConstructMat3x2:
+      case EOpConstructMat3:
+      case EOpConstructMat3x4:
+      case EOpConstructMat4x2:
+      case EOpConstructMat4x3:
+      case EOpConstructMat4:
+        {
+            const TIntermSequence &sequence = *(node->getSequence());
+            if (sequence.size() == 1)
+            {
+                TIntermTyped *typed = sequence.front()->getAsTyped();
+                if (typed && typed->isMatrix())
+                {
+                    ensureVersionIsAtLeast(GLSL_VERSION_120);
+                }
+            }
+            break;
+        }
+      default:
+        break;
+    }
+
+    return visitChildren;
+}
+
+void TVersionGLSL::ensureVersionIsAtLeast(int version)
+{
+    mVersion = std::max(version, mVersion);
+}
+
+}  // namespace sh