Shuffling spirv code so it's not tied to xe::gpu.

Will make it easier to use in standalone apps.

src/xenia/ui/spirv/spirv_disassembler.h

@@ -0,0 +1,66 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2015 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_UI_SPIRV_SPIRV_DISASSEMBLER_H_
+#define XENIA_UI_SPIRV_SPIRV_DISASSEMBLER_H_
+
+#include <memory>
+#include <string>
+
+#include "xenia/base/string_buffer.h"
+#include "xenia/ui/spirv/spirv_util.h"
+
+namespace xe {
+namespace ui {
+namespace spirv {
+
+class SpirvDisassembler {
+ public:
+  class Result {
+   public:
+    Result(spv_text text, spv_diagnostic diagnostic);
+    ~Result();
+
+    // True if the result has an error associated with it.
+    bool has_error() const;
+    // Index of the error in the provided binary word data.
+    size_t error_word_index() const;
+    // Human-readable description of the error.
+    const char* error_string() const;
+
+    // Disassembled source text.
+    // Returned pointer lifetime is tied to this Result instance.
+    const char* text() const;
+    // Converts the disassembled source text to a string.
+    std::string to_string() const;
+    // Appends the disassembled source text to the given buffer.
+    void AppendText(StringBuffer* target_buffer) const;
+
+   private:
+    spv_text text_ = nullptr;
+    spv_diagnostic diagnostic_ = nullptr;
+  };
+
+  SpirvDisassembler();
+  ~SpirvDisassembler();
+
+  // Disassembles the given SPIRV binary.
+  // The return will be nullptr if disassembly fails due to a library error.
+  // The return may have an error set on it if the SPIRV binary is malformed.
+  std::unique_ptr<Result> Disassemble(const uint32_t* words, size_t word_count);
+
+ private:
+  spv_context spv_context_ = nullptr;
+};
+
+}  // namespace spirv
+}  // namespace ui
+}  // namespace xe
+
+#endif  // XENIA_UI_SPIRV_SPIRV_DISASSEMBLER_H_