1 files changed, 93 insertions, 0 deletions
diff --git a/gfx/skia/skia/include/private/SkSLLayout.h b/gfx/skia/skia/include/private/SkSLLayout.h
new file mode 100644
index 0000000000..a99f18a477
--- /dev/null
+++ b/gfx/skia/skia/include/private/SkSLLayout.h
@@ -0,0 +1,93 @@
+/*
+ * 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_LAYOUT
+#define SKSL_LAYOUT
+
+#include <string>
+
+namespace SkSL {
+
+/**
+ * Represents a layout block appearing before a variable declaration, as in:
+ *
+ * layout (location = 0) int x;
+ */
+struct Layout {
+    enum Flag {
+        kOriginUpperLeft_Flag            = 1 <<  0,
+        kPushConstant_Flag               = 1 <<  1,
+        kBlendSupportAllEquations_Flag   = 1 <<  2,
+        kColor_Flag                      = 1 <<  3,
+
+        // These flags indicate if the qualifier appeared, regardless of the accompanying value.
+        kLocation_Flag                   = 1 <<  4,
+        kOffset_Flag                     = 1 <<  5,
+        kBinding_Flag                    = 1 <<  6,
+        kTexture_Flag                    = 1 <<  7,
+        kSampler_Flag                    = 1 <<  8,
+        kIndex_Flag                      = 1 <<  9,
+        kSet_Flag                        = 1 << 10,
+        kBuiltin_Flag                    = 1 << 11,
+        kInputAttachmentIndex_Flag       = 1 << 12,
+
+        // These flags indicate the backend type; only one at most can be set.
+        kSPIRV_Flag                      = 1 << 13,
+        kMetal_Flag                      = 1 << 14,
+        kGL_Flag                         = 1 << 15,
+        kWGSL_Flag                       = 1 << 16,
+    };
+
+    static constexpr int kAllBackendFlagsMask =
+            Layout::kSPIRV_Flag | Layout::kMetal_Flag | Layout::kGL_Flag | Layout::kWGSL_Flag;
+
+    Layout(int flags, int location, int offset, int binding, int index, int set, int builtin,
+           int inputAttachmentIndex)
+    : fFlags(flags)
+    , fLocation(location)
+    , fOffset(offset)
+    , fBinding(binding)
+    , fIndex(index)
+    , fSet(set)
+    , fBuiltin(builtin)
+    , fInputAttachmentIndex(inputAttachmentIndex) {}
+
+    Layout() = default;
+
+    static Layout builtin(int builtin) {
+        Layout result;
+        result.fBuiltin = builtin;
+        return result;
+    }
+
+    std::string description() const;
+
+    bool operator==(const Layout& other) const;
+
+    bool operator!=(const Layout& other) const {
+        return !(*this == other);
+    }
+
+    int fFlags = 0;
+    int fLocation = -1;
+    int fOffset = -1;
+    int fBinding = -1;
+    int fTexture = -1;
+    int fSampler = -1;
+    int fIndex = -1;
+    int fSet = -1;
+    // builtin comes from SPIR-V and identifies which particular builtin value this object
+    // represents.
+    int fBuiltin = -1;
+    // input_attachment_index comes from Vulkan/SPIR-V to connect a shader variable to the a
+    // corresponding attachment on the subpass in which the shader is being used.
+    int fInputAttachmentIndex = -1;
+};
+
+}  // namespace SkSL
+
+#endif