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_assembler.h

@@ -0,0 +1,69 @@
+/**
+ ******************************************************************************
+ * 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_ASSEMBLER_H_
+#define XENIA_UI_SPIRV_SPIRV_ASSEMBLER_H_
+
+#include <memory>
+#include <string>
+
+#include "xenia/ui/spirv/spirv_util.h"
+
+namespace xe {
+namespace ui {
+namespace spirv {
+
+class SpirvAssembler {
+ public:
+  class Result {
+   public:
+    Result(spv_binary binary, spv_diagnostic diagnostic);
+    ~Result();
+
+    // True if the result has an error associated with it.
+    bool has_error() const;
+    // Line of the error in the provided source text.
+    size_t error_source_line() const;
+    // Column of the error in the provided source text.
+    size_t error_source_column() const;
+    // Human-readable description of the error.
+    const char* error_string() const;
+
+    // Assembled SPIRV binary.
+    // Returned pointer lifetime is tied to this Result instance.
+    const uint32_t* words() const;
+    // Size of the SPIRV binary, in words.
+    size_t word_count() const;
+
+   private:
+    spv_binary binary_ = nullptr;
+    spv_diagnostic diagnostic_ = nullptr;
+  };
+
+  SpirvAssembler();
+  ~SpirvAssembler();
+
+  // Assembles the given source text into a SPIRV binary.
+  // The return will be nullptr if assembly fails due to a library error.
+  // The return may have an error set on it if the source text is malformed.
+  std::unique_ptr<Result> Assemble(const char* source_text,
+                                   size_t source_text_length);
+  std::unique_ptr<Result> Assemble(const std::string& source_text) {
+    return Assemble(source_text.c_str(), source_text.size());
+  }
+
+ private:
+  spv_context spv_context_ = nullptr;
+};
+
+}  // namespace spirv
+}  // namespace ui
+}  // namespace xe
+
+#endif  // XENIA_UI_SPIRV_SPIRV_ASSEMBLER_H_