1 files changed, 156 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/compiler/translator/VersionGLSL.cpp b/gfx/angle/checkout/src/compiler/translator/VersionGLSL.cpp
new file mode 100644
index 0000000000..3ff4216a0d
--- /dev/null
+++ b/gfx/angle/checkout/src/compiler/translator/VersionGLSL.cpp
@@ -0,0 +1,156 @@
+//
+// Copyright 2002 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"
+
+#include "angle_gl.h"
+#include "compiler/translator/Symbol.h"
+
+namespace sh
+{
+
+namespace
+{
+constexpr const ImmutableString kGlPointCoordString("gl_PointCoord");
+}  // anonymous namespace
+
+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);
+    }
+    if (type == GL_COMPUTE_SHADER)
+    {
+        ensureVersionIsAtLeast(GLSL_VERSION_430);
+    }
+}
+
+void TVersionGLSL::visitSymbol(TIntermSymbol *node)
+{
+    if (node->variable().symbolType() == SymbolType::BuiltIn &&
+        node->getName() == kGlPointCoordString)
+    {
+        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::visitGlobalQualifierDeclaration(Visit, TIntermGlobalQualifierDeclaration *node)
+{
+    if (node->isPrecise())
+    {
+        ensureVersionIsAtLeast(GLSL_VERSION_420);
+    }
+    else
+    {
+        ensureVersionIsAtLeast(GLSL_VERSION_120);
+    }
+    return true;
+}
+
+void TVersionGLSL::visitFunctionPrototype(TIntermFunctionPrototype *node)
+{
+    size_t paramCount = node->getFunction()->getParamCount();
+    for (size_t i = 0; i < paramCount; ++i)
+    {
+        const TVariable *param = node->getFunction()->getParam(i);
+        const TType &type      = param->getType();
+        if (type.isArray())
+        {
+            TQualifier qualifier = type.getQualifier();
+            if ((qualifier == EvqParamOut) || (qualifier == EvqParamInOut))
+            {
+                ensureVersionIsAtLeast(GLSL_VERSION_120);
+                break;
+            }
+        }
+    }
+}
+
+bool TVersionGLSL::visitAggregate(Visit, TIntermAggregate *node)
+{
+    if (node->getOp() == EOpConstruct && node->getType().isMatrix())
+    {
+        const TIntermSequence &sequence = *(node->getSequence());
+        if (sequence.size() == 1)
+        {
+            TIntermTyped *typed = sequence.front()->getAsTyped();
+            if (typed && typed->isMatrix())
+            {
+                ensureVersionIsAtLeast(GLSL_VERSION_120);
+            }
+        }
+    }
+    return true;
+}
+
+void TVersionGLSL::ensureVersionIsAtLeast(int version)
+{
+    mVersion = std::max(version, mVersion);
+}
+
+}  // namespace sh