1 files changed, 178 insertions, 0 deletions
diff --git a/gfx/skia/skia/include/private/SkSLModifiers.h b/gfx/skia/skia/include/private/SkSLModifiers.h
new file mode 100644
index 0000000000..7e8efddf19
--- /dev/null
+++ b/gfx/skia/skia/include/private/SkSLModifiers.h
@@ -0,0 +1,178 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SKSL_MODIFIERS
+#define SKSL_MODIFIERS
+
+#include "include/private/SkSLLayout.h"
+
+#include <cstddef>
+#include <memory>
+#include <string>
+
+namespace SkSL {
+
+class Context;
+class Position;
+
+/**
+ * A set of modifier keywords (in, out, uniform, etc.) appearing before a declaration.
+ */
+struct Modifiers {
+    /**
+     * OpenGL requires modifiers to be in a strict order:
+     * - invariant-qualifier:     (invariant)
+     * - interpolation-qualifier: flat, noperspective, (smooth)
+     * - storage-qualifier:       const, uniform
+     * - parameter-qualifier:     in, out, inout
+     * - precision-qualifier:     highp, mediump, lowp
+     *
+     * SkSL does not have `invariant` or `smooth`.
+     */
+
+    enum Flag {
+        kNo_Flag             =       0,
+        // Real GLSL modifiers
+        kFlat_Flag           = 1 <<  0,
+        kNoPerspective_Flag  = 1 <<  1,
+        kConst_Flag          = 1 <<  2,
+        kUniform_Flag        = 1 <<  3,
+        kIn_Flag             = 1 <<  4,
+        kOut_Flag            = 1 <<  5,
+        kHighp_Flag          = 1 <<  6,
+        kMediump_Flag        = 1 <<  7,
+        kLowp_Flag           = 1 <<  8,
+        kReadOnly_Flag       = 1 <<  9,
+        kWriteOnly_Flag      = 1 << 10,
+        kBuffer_Flag         = 1 << 11,
+        // Corresponds to the GLSL 'shared' modifier. Only allowed in a compute program.
+        kWorkgroup_Flag      = 1 << 12,
+        // SkSL extensions, not present in GLSL
+        kExport_Flag         = 1 << 13,
+        kES3_Flag            = 1 << 14,
+        kPure_Flag           = 1 << 15,
+        kInline_Flag         = 1 << 16,
+        kNoInline_Flag       = 1 << 17,
+    };
+
+    Modifiers()
+    : fLayout(Layout())
+    , fFlags(0) {}
+
+    Modifiers(const Layout& layout, int flags)
+    : fLayout(layout)
+    , fFlags(flags) {}
+
+    std::string description() const {
+        return fLayout.description() + DescribeFlags(fFlags) + " ";
+    }
+
+    static std::string DescribeFlags(int flags) {
+        // SkSL extensions
+        std::string result;
+        if (flags & kExport_Flag) {
+            result += "$export ";
+        }
+        if (flags & kES3_Flag) {
+            result += "$es3 ";
+        }
+        if (flags & kPure_Flag) {
+            result += "$pure ";
+        }
+        if (flags & kInline_Flag) {
+            result += "inline ";
+        }
+        if (flags & kNoInline_Flag) {
+            result += "noinline ";
+        }
+
+        // Real GLSL qualifiers (must be specified in order in GLSL 4.1 and below)
+        if (flags & kFlat_Flag) {
+            result += "flat ";
+        }
+        if (flags & kNoPerspective_Flag) {
+            result += "noperspective ";
+        }
+        if (flags & kConst_Flag) {
+            result += "const ";
+        }
+        if (flags & kUniform_Flag) {
+            result += "uniform ";
+        }
+        if ((flags & kIn_Flag) && (flags & kOut_Flag)) {
+            result += "inout ";
+        } else if (flags & kIn_Flag) {
+            result += "in ";
+        } else if (flags & kOut_Flag) {
+            result += "out ";
+        }
+        if (flags & kHighp_Flag) {
+            result += "highp ";
+        }
+        if (flags & kMediump_Flag) {
+            result += "mediump ";
+        }
+        if (flags & kLowp_Flag) {
+            result += "lowp ";
+        }
+        if (flags & kReadOnly_Flag) {
+            result += "readonly ";
+        }
+        if (flags & kWriteOnly_Flag) {
+            result += "writeonly ";
+        }
+        if (flags & kBuffer_Flag) {
+            result += "buffer ";
+        }
+
+        // We're using a non-GLSL name for this one; the GLSL equivalent is "shared"
+        if (flags & kWorkgroup_Flag) {
+            result += "workgroup ";
+        }
+
+        if (!result.empty()) {
+            result.pop_back();
+        }
+        return result;
+    }
+
+    bool operator==(const Modifiers& other) const {
+        return fLayout == other.fLayout && fFlags == other.fFlags;
+    }
+
+    bool operator!=(const Modifiers& other) const {
+        return !(*this == other);
+    }
+
+    /**
+     * Verifies that only permitted modifiers and layout flags are included. Reports errors and
+     * returns false in the event of a violation.
+     */
+    bool checkPermitted(const Context& context,
+                        Position pos,
+                        int permittedModifierFlags,
+                        int permittedLayoutFlags) const;
+
+    Layout fLayout;
+    int fFlags;
+};
+
+} // namespace SkSL
+
+namespace std {
+
+template <>
+struct hash<SkSL::Modifiers> {
+    size_t operator()(const SkSL::Modifiers& key) const {
+        return (size_t) key.fFlags ^ ((size_t) key.fLayout.fFlags << 8) ^
+               ((size_t) key.fLayout.fBuiltin << 16);
+    }
+};
+
+} // namespace std
+
+#endif