Added Vulkan Shader Modules with GLSL->SPIR-V translation.

gpu/vulkan/vulkan_shader_module.h

+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef GPU_VULKAN_VULKAN_SHADER_MODULE_H_
+#define GPU_VULKAN_VULKAN_SHADER_MODULE_H_
+
+#include <string>
+#include <vulkan/vulkan.h>
+
+#include "base/macros.h"
+#include "gpu/vulkan/vulkan_export.h"
+
+namespace gpu {
+
+class VulkanDeviceQueue;
+
+class VULKAN_EXPORT VulkanShaderModule {
+ public:
+  enum class ShaderType {
+    INVALID = -1,

[piman, 2016/05/16 23:35:31]

nit: do we need INVALID? e.g. IsValid is based on handle_ being !null. It would
be slightly more helpful to not have INVALID for things like switch cases.

[David Yen, 2016/05/17 18:13:57]

Done.

+    VERTEX,
+    FRAGMENT,
+  };
+
+  VulkanShaderModule(VulkanDeviceQueue* device_queue);
+  ~VulkanShaderModule();
+
+  bool InitializeGLSL(ShaderType type,
+                      const std::string& name,

[piman, 2016/05/16 23:35:31]

nit: std::string (no const ref), and use std::move in the implementation (here
and below), and the callers if needed.

[David Yen, 2016/05/17 18:14:16]

Done.

+                      const std::string& entry_point,
+                      const std::string& source);
+  bool InitializeSPIRV(ShaderType type,
+                       const std::string& name,
+                       const std::string& entry_point,
+                       const std::string& source);
+  void Destroy();
+
+  bool IsValid() const { return handle_ != VK_NULL_HANDLE; }
+  std::string GetErrorMessages() const { return error_messages_; }
+
+  ShaderType shader_type() const { return shader_type_; }
+  const std::string& name() const { return name_; }
+  VkShaderModule handle() const { return handle_; }
+  const std::string& entry_point() const { return entry_point_; }
+
+ private:
+  VulkanDeviceQueue* device_queue_ = nullptr;
+  ShaderType shader_type_ = ShaderType::INVALID;
+  VkShaderModule handle_ = VK_NULL_HANDLE;
+  std::string name_;
+  std::string entry_point_;
+  std::string error_messages_;
+
+  DISALLOW_COPY_AND_ASSIGN(VulkanShaderModule);
+};
+
+}  // namespace gpu
+
+#endif  // GPU_VULKAN_VULKAN_SHADER_MODULE_H_