[D3D12] Begin writing the DXBC translator

src/xenia/gpu/dxbc_shader_translator.cc

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+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2018 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/gpu/dxbc_shader_translator.h"
+
+#include <cstring>
+
+#include "third_party/dxbc/DXBCChecksum.h"
+#include "third_party/dxbc/d3d12TokenizedProgramFormat.hpp"
+
+namespace xe {
+namespace gpu {
+using namespace ucode;
+
+DxbcShaderTranslator::DxbcShaderTranslator() {}
+DxbcShaderTranslator::~DxbcShaderTranslator() = default;
+
+void DxbcShaderTranslator::Reset() {
+  ShaderTranslator::Reset();
+
+  shader_code_.clear();
+}
+
+std::vector<uint8_t> DxbcShaderTranslator::CompleteTranslation() {
+  shader_object_.clear();
+
+  // Shader object header.
+  shader_object_.push_back('CBXD');
+  // Reserve space for the checksum.
+  for (uint32_t i = 0; i < 4; ++i) {
+    shader_object_.push_back(0);
+  }
+  shader_object_.push_back(1);
+  // Reserve space for the size.
+  shader_object_.push_back(0);
+  // 5 chunks - RDEF, ISGN, OSGN, SHEX, STAT.
+  shader_object_.push_back(5);
+
+  // Copy bytes out.
+  // TODO(Triang3l): avoid copy?
+  std::vector<uint8_t> shader_object_bytes;
+  shader_object_bytes.resize(shader_object_.size() * sizeof(uint32_t));
+  std::memcpy(shader_object_bytes.data(), shader_object_.data(),
+              shader_object_bytes.size());
+  return shader_object_bytes;
+}
+
+}  // namespace gpu
+}  // namespace xe

src/xenia/gpu/dxbc_shader_translator.h

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+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2018 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_GPU_DXBC_SHADER_TRANSLATOR_H_
+#define XENIA_GPU_DXBC_SHADER_TRANSLATOR_H_
+
+#include <vector>
+
+#include "xenia/gpu/shader_translator.h"
+
+namespace xe {
+namespace gpu {
+
+// Generates shader model 5_1 byte code (for Direct3D 12).
+class DxbcShaderTranslator : public ShaderTranslator {
+ public:
+  DxbcShaderTranslator();
+  ~DxbcShaderTranslator() override;
+
+ protected:
+  void Reset() override;
+
+  std::vector<uint8_t> CompleteTranslation() override;
+
+ private:
+  // Executable instructions - generated during translation.
+  std::vector<uint32_t> shader_code_;
+  // Complete shader object, with all the needed chunks and dcl_ instructions -
+  // generated in the end of translation.
+  std::vector<uint32_t> shader_object_;
+};
+
+}  // namespace gpu
+}  // namespace xe
+
+#endif  // XENIA_GPU_DXBC_SHADER_TRANSLATOR_H_