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.cc

@@ -0,0 +1,77 @@
+/**
+ ******************************************************************************
+ * 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. *
+ ******************************************************************************
+ */
+
+#include "xenia/ui/spirv/spirv_assembler.h"
+
+#include "third_party/spirv-tools/include/libspirv/libspirv.h"
+#include "xenia/base/logging.h"
+
+namespace xe {
+namespace ui {
+namespace spirv {
+
+SpirvAssembler::Result::Result(spv_binary binary, spv_diagnostic diagnostic)
+    : binary_(binary), diagnostic_(diagnostic) {}
+
+SpirvAssembler::Result::~Result() {
+  if (binary_) {
+    spvBinaryDestroy(binary_);
+  }
+  if (diagnostic_) {
+    spvDiagnosticDestroy(diagnostic_);
+  }
+}
+
+bool SpirvAssembler::Result::has_error() const { return !!diagnostic_; }
+
+size_t SpirvAssembler::Result::error_source_line() const {
+  return diagnostic_ ? diagnostic_->position.line : 0;
+}
+
+size_t SpirvAssembler::Result::error_source_column() const {
+  return diagnostic_ ? diagnostic_->position.column : 0;
+}
+
+const char* SpirvAssembler::Result::error_string() const {
+  return diagnostic_ ? diagnostic_->error : "";
+}
+
+const uint32_t* SpirvAssembler::Result::words() const {
+  return binary_ ? binary_->code : nullptr;
+}
+
+size_t SpirvAssembler::Result::word_count() const {
+  return binary_ ? binary_->wordCount : 0;
+}
+
+SpirvAssembler::SpirvAssembler() : spv_context_(spvContextCreate()) {}
+
+SpirvAssembler::~SpirvAssembler() { spvContextDestroy(spv_context_); }
+
+std::unique_ptr<SpirvAssembler::Result> SpirvAssembler::Assemble(
+    const char* source_text, size_t source_text_length) {
+  spv_binary binary = nullptr;
+  spv_diagnostic diagnostic = nullptr;
+  auto result_code = spvTextToBinary(spv_context_, source_text,
+                                     source_text_length, &binary, &diagnostic);
+  std::unique_ptr<Result> result(new Result(binary, diagnostic));
+  if (result_code) {
+    XELOGE("Failed to assemble spv: %d", result_code);
+    if (result->has_error()) {
+      return result;
+    } else {
+      return nullptr;
+    }
+  }
+  return result;
+}
+
+}  // namespace spirv
+}  // namespace ui
+}  // namespace xe